2 * Copyright © 2008-2015 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
29 #include <drm/drm_vma_manager.h>
30 #include <drm/i915_drm.h>
32 #include "i915_gem_clflush.h"
33 #include "i915_vgpu.h"
34 #include "i915_trace.h"
35 #include "intel_drv.h"
36 #include "intel_frontbuffer.h"
37 #include "intel_mocs.h"
38 #include "i915_gemfs.h"
39 #include <linux/dma-fence-array.h>
40 #include <linux/kthread.h>
41 #include <linux/reservation.h>
42 #include <linux/shmem_fs.h>
43 #include <linux/slab.h>
44 #include <linux/stop_machine.h>
45 #include <linux/swap.h>
46 #include <linux/pci.h>
47 #include <linux/dma-buf.h>
49 static void i915_gem_flush_free_objects(struct drm_i915_private *i915);
51 static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
56 if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
59 return obj->pin_global; /* currently in use by HW, keep flushed */
63 insert_mappable_node(struct i915_ggtt *ggtt,
64 struct drm_mm_node *node, u32 size)
66 memset(node, 0, sizeof(*node));
67 return drm_mm_insert_node_in_range(&ggtt->base.mm, node,
68 size, 0, I915_COLOR_UNEVICTABLE,
69 0, ggtt->mappable_end,
74 remove_mappable_node(struct drm_mm_node *node)
76 drm_mm_remove_node(node);
79 /* some bookkeeping */
80 static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
83 spin_lock(&dev_priv->mm.object_stat_lock);
84 dev_priv->mm.object_count++;
85 dev_priv->mm.object_memory += size;
86 spin_unlock(&dev_priv->mm.object_stat_lock);
89 static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
92 spin_lock(&dev_priv->mm.object_stat_lock);
93 dev_priv->mm.object_count--;
94 dev_priv->mm.object_memory -= size;
95 spin_unlock(&dev_priv->mm.object_stat_lock);
99 i915_gem_wait_for_error(struct i915_gpu_error *error)
106 * Only wait 10 seconds for the gpu reset to complete to avoid hanging
107 * userspace. If it takes that long something really bad is going on and
108 * we should simply try to bail out and fail as gracefully as possible.
110 ret = wait_event_interruptible_timeout(error->reset_queue,
111 !i915_reset_backoff(error),
114 DRM_ERROR("Timed out waiting for the gpu reset to complete\n");
116 } else if (ret < 0) {
123 int i915_mutex_lock_interruptible(struct drm_device *dev)
125 struct drm_i915_private *dev_priv = to_i915(dev);
128 ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
132 ret = mutex_lock_interruptible(&dev->struct_mutex);
140 i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
141 struct drm_file *file)
143 struct drm_i915_private *dev_priv = to_i915(dev);
144 struct i915_ggtt *ggtt = &dev_priv->ggtt;
145 struct drm_i915_gem_get_aperture *args = data;
146 struct i915_vma *vma;
149 pinned = ggtt->base.reserved;
150 mutex_lock(&dev->struct_mutex);
151 list_for_each_entry(vma, &ggtt->base.active_list, vm_link)
152 if (i915_vma_is_pinned(vma))
153 pinned += vma->node.size;
154 list_for_each_entry(vma, &ggtt->base.inactive_list, vm_link)
155 if (i915_vma_is_pinned(vma))
156 pinned += vma->node.size;
157 mutex_unlock(&dev->struct_mutex);
159 args->aper_size = ggtt->base.total;
160 args->aper_available_size = args->aper_size - pinned;
165 static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
167 struct address_space *mapping = obj->base.filp->f_mapping;
168 drm_dma_handle_t *phys;
170 struct scatterlist *sg;
175 if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
178 /* Always aligning to the object size, allows a single allocation
179 * to handle all possible callers, and given typical object sizes,
180 * the alignment of the buddy allocation will naturally match.
182 phys = drm_pci_alloc(obj->base.dev,
183 roundup_pow_of_two(obj->base.size),
184 roundup_pow_of_two(obj->base.size));
189 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
193 page = shmem_read_mapping_page(mapping, i);
199 src = kmap_atomic(page);
200 memcpy(vaddr, src, PAGE_SIZE);
201 drm_clflush_virt_range(vaddr, PAGE_SIZE);
208 i915_gem_chipset_flush(to_i915(obj->base.dev));
210 st = kmalloc(sizeof(*st), GFP_KERNEL);
216 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
224 sg->length = obj->base.size;
226 sg_dma_address(sg) = phys->busaddr;
227 sg_dma_len(sg) = obj->base.size;
229 obj->phys_handle = phys;
231 __i915_gem_object_set_pages(obj, st, sg->length);
236 drm_pci_free(obj->base.dev, phys);
241 static void __start_cpu_write(struct drm_i915_gem_object *obj)
243 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
244 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
245 if (cpu_write_needs_clflush(obj))
246 obj->cache_dirty = true;
250 __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
251 struct sg_table *pages,
254 GEM_BUG_ON(obj->mm.madv == __I915_MADV_PURGED);
256 if (obj->mm.madv == I915_MADV_DONTNEED)
257 obj->mm.dirty = false;
260 (obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0 &&
261 !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ))
262 drm_clflush_sg(pages);
264 __start_cpu_write(obj);
268 i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
269 struct sg_table *pages)
271 __i915_gem_object_release_shmem(obj, pages, false);
274 struct address_space *mapping = obj->base.filp->f_mapping;
275 char *vaddr = obj->phys_handle->vaddr;
278 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
282 page = shmem_read_mapping_page(mapping, i);
286 dst = kmap_atomic(page);
287 drm_clflush_virt_range(vaddr, PAGE_SIZE);
288 memcpy(dst, vaddr, PAGE_SIZE);
291 set_page_dirty(page);
292 if (obj->mm.madv == I915_MADV_WILLNEED)
293 mark_page_accessed(page);
297 obj->mm.dirty = false;
300 sg_free_table(pages);
303 drm_pci_free(obj->base.dev, obj->phys_handle);
307 i915_gem_object_release_phys(struct drm_i915_gem_object *obj)
309 i915_gem_object_unpin_pages(obj);
312 static const struct drm_i915_gem_object_ops i915_gem_phys_ops = {
313 .get_pages = i915_gem_object_get_pages_phys,
314 .put_pages = i915_gem_object_put_pages_phys,
315 .release = i915_gem_object_release_phys,
318 static const struct drm_i915_gem_object_ops i915_gem_object_ops;
320 int i915_gem_object_unbind(struct drm_i915_gem_object *obj)
322 struct i915_vma *vma;
323 LIST_HEAD(still_in_list);
326 lockdep_assert_held(&obj->base.dev->struct_mutex);
328 /* Closed vma are removed from the obj->vma_list - but they may
329 * still have an active binding on the object. To remove those we
330 * must wait for all rendering to complete to the object (as unbinding
331 * must anyway), and retire the requests.
333 ret = i915_gem_object_set_to_cpu_domain(obj, false);
337 while ((vma = list_first_entry_or_null(&obj->vma_list,
340 list_move_tail(&vma->obj_link, &still_in_list);
341 ret = i915_vma_unbind(vma);
345 list_splice(&still_in_list, &obj->vma_list);
351 i915_gem_object_wait_fence(struct dma_fence *fence,
354 struct intel_rps_client *rps_client)
356 struct drm_i915_gem_request *rq;
358 BUILD_BUG_ON(I915_WAIT_INTERRUPTIBLE != 0x1);
360 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
363 if (!dma_fence_is_i915(fence))
364 return dma_fence_wait_timeout(fence,
365 flags & I915_WAIT_INTERRUPTIBLE,
368 rq = to_request(fence);
369 if (i915_gem_request_completed(rq))
372 /* This client is about to stall waiting for the GPU. In many cases
373 * this is undesirable and limits the throughput of the system, as
374 * many clients cannot continue processing user input/output whilst
375 * blocked. RPS autotuning may take tens of milliseconds to respond
376 * to the GPU load and thus incurs additional latency for the client.
377 * We can circumvent that by promoting the GPU frequency to maximum
378 * before we wait. This makes the GPU throttle up much more quickly
379 * (good for benchmarks and user experience, e.g. window animations),
380 * but at a cost of spending more power processing the workload
381 * (bad for battery). Not all clients even want their results
382 * immediately and for them we should just let the GPU select its own
383 * frequency to maximise efficiency. To prevent a single client from
384 * forcing the clocks too high for the whole system, we only allow
385 * each client to waitboost once in a busy period.
388 if (INTEL_GEN(rq->i915) >= 6)
389 gen6_rps_boost(rq, rps_client);
394 timeout = i915_wait_request(rq, flags, timeout);
397 if (flags & I915_WAIT_LOCKED && i915_gem_request_completed(rq))
398 i915_gem_request_retire_upto(rq);
404 i915_gem_object_wait_reservation(struct reservation_object *resv,
407 struct intel_rps_client *rps_client)
409 unsigned int seq = __read_seqcount_begin(&resv->seq);
410 struct dma_fence *excl;
411 bool prune_fences = false;
413 if (flags & I915_WAIT_ALL) {
414 struct dma_fence **shared;
415 unsigned int count, i;
418 ret = reservation_object_get_fences_rcu(resv,
419 &excl, &count, &shared);
423 for (i = 0; i < count; i++) {
424 timeout = i915_gem_object_wait_fence(shared[i],
430 dma_fence_put(shared[i]);
433 for (; i < count; i++)
434 dma_fence_put(shared[i]);
437 prune_fences = count && timeout >= 0;
439 excl = reservation_object_get_excl_rcu(resv);
442 if (excl && timeout >= 0) {
443 timeout = i915_gem_object_wait_fence(excl, flags, timeout,
445 prune_fences = timeout >= 0;
450 /* Oportunistically prune the fences iff we know they have *all* been
451 * signaled and that the reservation object has not been changed (i.e.
452 * no new fences have been added).
454 if (prune_fences && !__read_seqcount_retry(&resv->seq, seq)) {
455 if (reservation_object_trylock(resv)) {
456 if (!__read_seqcount_retry(&resv->seq, seq))
457 reservation_object_add_excl_fence(resv, NULL);
458 reservation_object_unlock(resv);
465 static void __fence_set_priority(struct dma_fence *fence, int prio)
467 struct drm_i915_gem_request *rq;
468 struct intel_engine_cs *engine;
470 if (dma_fence_is_signaled(fence) || !dma_fence_is_i915(fence))
473 rq = to_request(fence);
475 if (!engine->schedule)
478 engine->schedule(rq, prio);
481 static void fence_set_priority(struct dma_fence *fence, int prio)
483 /* Recurse once into a fence-array */
484 if (dma_fence_is_array(fence)) {
485 struct dma_fence_array *array = to_dma_fence_array(fence);
488 for (i = 0; i < array->num_fences; i++)
489 __fence_set_priority(array->fences[i], prio);
491 __fence_set_priority(fence, prio);
496 i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
500 struct dma_fence *excl;
502 if (flags & I915_WAIT_ALL) {
503 struct dma_fence **shared;
504 unsigned int count, i;
507 ret = reservation_object_get_fences_rcu(obj->resv,
508 &excl, &count, &shared);
512 for (i = 0; i < count; i++) {
513 fence_set_priority(shared[i], prio);
514 dma_fence_put(shared[i]);
519 excl = reservation_object_get_excl_rcu(obj->resv);
523 fence_set_priority(excl, prio);
530 * Waits for rendering to the object to be completed
531 * @obj: i915 gem object
532 * @flags: how to wait (under a lock, for all rendering or just for writes etc)
533 * @timeout: how long to wait
534 * @rps_client: client (user process) to charge for any waitboosting
537 i915_gem_object_wait(struct drm_i915_gem_object *obj,
540 struct intel_rps_client *rps_client)
543 #if IS_ENABLED(CONFIG_LOCKDEP)
544 GEM_BUG_ON(debug_locks &&
545 !!lockdep_is_held(&obj->base.dev->struct_mutex) !=
546 !!(flags & I915_WAIT_LOCKED));
548 GEM_BUG_ON(timeout < 0);
550 timeout = i915_gem_object_wait_reservation(obj->resv,
553 return timeout < 0 ? timeout : 0;
556 static struct intel_rps_client *to_rps_client(struct drm_file *file)
558 struct drm_i915_file_private *fpriv = file->driver_priv;
560 return &fpriv->rps_client;
564 i915_gem_phys_pwrite(struct drm_i915_gem_object *obj,
565 struct drm_i915_gem_pwrite *args,
566 struct drm_file *file)
568 void *vaddr = obj->phys_handle->vaddr + args->offset;
569 char __user *user_data = u64_to_user_ptr(args->data_ptr);
571 /* We manually control the domain here and pretend that it
572 * remains coherent i.e. in the GTT domain, like shmem_pwrite.
574 intel_fb_obj_invalidate(obj, ORIGIN_CPU);
575 if (copy_from_user(vaddr, user_data, args->size))
578 drm_clflush_virt_range(vaddr, args->size);
579 i915_gem_chipset_flush(to_i915(obj->base.dev));
581 intel_fb_obj_flush(obj, ORIGIN_CPU);
585 void *i915_gem_object_alloc(struct drm_i915_private *dev_priv)
587 return kmem_cache_zalloc(dev_priv->objects, GFP_KERNEL);
590 void i915_gem_object_free(struct drm_i915_gem_object *obj)
592 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
593 kmem_cache_free(dev_priv->objects, obj);
597 i915_gem_create(struct drm_file *file,
598 struct drm_i915_private *dev_priv,
602 struct drm_i915_gem_object *obj;
606 size = roundup(size, PAGE_SIZE);
610 /* Allocate the new object */
611 obj = i915_gem_object_create(dev_priv, size);
615 ret = drm_gem_handle_create(file, &obj->base, &handle);
616 /* drop reference from allocate - handle holds it now */
617 i915_gem_object_put(obj);
626 i915_gem_dumb_create(struct drm_file *file,
627 struct drm_device *dev,
628 struct drm_mode_create_dumb *args)
630 /* have to work out size/pitch and return them */
631 args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 64);
632 args->size = args->pitch * args->height;
633 return i915_gem_create(file, to_i915(dev),
634 args->size, &args->handle);
637 static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
639 return !(obj->cache_level == I915_CACHE_NONE ||
640 obj->cache_level == I915_CACHE_WT);
644 * Creates a new mm object and returns a handle to it.
645 * @dev: drm device pointer
646 * @data: ioctl data blob
647 * @file: drm file pointer
650 i915_gem_create_ioctl(struct drm_device *dev, void *data,
651 struct drm_file *file)
653 struct drm_i915_private *dev_priv = to_i915(dev);
654 struct drm_i915_gem_create *args = data;
656 i915_gem_flush_free_objects(dev_priv);
658 return i915_gem_create(file, dev_priv,
659 args->size, &args->handle);
662 static inline enum fb_op_origin
663 fb_write_origin(struct drm_i915_gem_object *obj, unsigned int domain)
665 return (domain == I915_GEM_DOMAIN_GTT ?
666 obj->frontbuffer_ggtt_origin : ORIGIN_CPU);
669 void i915_gem_flush_ggtt_writes(struct drm_i915_private *dev_priv)
672 * No actual flushing is required for the GTT write domain for reads
673 * from the GTT domain. Writes to it "immediately" go to main memory
674 * as far as we know, so there's no chipset flush. It also doesn't
675 * land in the GPU render cache.
677 * However, we do have to enforce the order so that all writes through
678 * the GTT land before any writes to the device, such as updates to
681 * We also have to wait a bit for the writes to land from the GTT.
682 * An uncached read (i.e. mmio) seems to be ideal for the round-trip
683 * timing. This issue has only been observed when switching quickly
684 * between GTT writes and CPU reads from inside the kernel on recent hw,
685 * and it appears to only affect discrete GTT blocks (i.e. on LLC
686 * system agents we cannot reproduce this behaviour, until Cannonlake
692 intel_runtime_pm_get(dev_priv);
693 spin_lock_irq(&dev_priv->uncore.lock);
695 POSTING_READ_FW(RING_HEAD(RENDER_RING_BASE));
697 spin_unlock_irq(&dev_priv->uncore.lock);
698 intel_runtime_pm_put(dev_priv);
702 flush_write_domain(struct drm_i915_gem_object *obj, unsigned int flush_domains)
704 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
705 struct i915_vma *vma;
707 if (!(obj->base.write_domain & flush_domains))
710 switch (obj->base.write_domain) {
711 case I915_GEM_DOMAIN_GTT:
712 i915_gem_flush_ggtt_writes(dev_priv);
714 intel_fb_obj_flush(obj,
715 fb_write_origin(obj, I915_GEM_DOMAIN_GTT));
717 for_each_ggtt_vma(vma, obj) {
721 i915_vma_unset_ggtt_write(vma);
725 case I915_GEM_DOMAIN_CPU:
726 i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
729 case I915_GEM_DOMAIN_RENDER:
730 if (gpu_write_needs_clflush(obj))
731 obj->cache_dirty = true;
735 obj->base.write_domain = 0;
739 __copy_to_user_swizzled(char __user *cpu_vaddr,
740 const char *gpu_vaddr, int gpu_offset,
743 int ret, cpu_offset = 0;
746 int cacheline_end = ALIGN(gpu_offset + 1, 64);
747 int this_length = min(cacheline_end - gpu_offset, length);
748 int swizzled_gpu_offset = gpu_offset ^ 64;
750 ret = __copy_to_user(cpu_vaddr + cpu_offset,
751 gpu_vaddr + swizzled_gpu_offset,
756 cpu_offset += this_length;
757 gpu_offset += this_length;
758 length -= this_length;
765 __copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset,
766 const char __user *cpu_vaddr,
769 int ret, cpu_offset = 0;
772 int cacheline_end = ALIGN(gpu_offset + 1, 64);
773 int this_length = min(cacheline_end - gpu_offset, length);
774 int swizzled_gpu_offset = gpu_offset ^ 64;
776 ret = __copy_from_user(gpu_vaddr + swizzled_gpu_offset,
777 cpu_vaddr + cpu_offset,
782 cpu_offset += this_length;
783 gpu_offset += this_length;
784 length -= this_length;
791 * Pins the specified object's pages and synchronizes the object with
792 * GPU accesses. Sets needs_clflush to non-zero if the caller should
793 * flush the object from the CPU cache.
795 int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
796 unsigned int *needs_clflush)
800 lockdep_assert_held(&obj->base.dev->struct_mutex);
803 if (!i915_gem_object_has_struct_page(obj))
806 ret = i915_gem_object_wait(obj,
807 I915_WAIT_INTERRUPTIBLE |
809 MAX_SCHEDULE_TIMEOUT,
814 ret = i915_gem_object_pin_pages(obj);
818 if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ ||
819 !static_cpu_has(X86_FEATURE_CLFLUSH)) {
820 ret = i915_gem_object_set_to_cpu_domain(obj, false);
827 flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
829 /* If we're not in the cpu read domain, set ourself into the gtt
830 * read domain and manually flush cachelines (if required). This
831 * optimizes for the case when the gpu will dirty the data
832 * anyway again before the next pread happens.
834 if (!obj->cache_dirty &&
835 !(obj->base.read_domains & I915_GEM_DOMAIN_CPU))
836 *needs_clflush = CLFLUSH_BEFORE;
839 /* return with the pages pinned */
843 i915_gem_object_unpin_pages(obj);
847 int i915_gem_obj_prepare_shmem_write(struct drm_i915_gem_object *obj,
848 unsigned int *needs_clflush)
852 lockdep_assert_held(&obj->base.dev->struct_mutex);
855 if (!i915_gem_object_has_struct_page(obj))
858 ret = i915_gem_object_wait(obj,
859 I915_WAIT_INTERRUPTIBLE |
862 MAX_SCHEDULE_TIMEOUT,
867 ret = i915_gem_object_pin_pages(obj);
871 if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE ||
872 !static_cpu_has(X86_FEATURE_CLFLUSH)) {
873 ret = i915_gem_object_set_to_cpu_domain(obj, true);
880 flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
882 /* If we're not in the cpu write domain, set ourself into the
883 * gtt write domain and manually flush cachelines (as required).
884 * This optimizes for the case when the gpu will use the data
885 * right away and we therefore have to clflush anyway.
887 if (!obj->cache_dirty) {
888 *needs_clflush |= CLFLUSH_AFTER;
891 * Same trick applies to invalidate partially written
892 * cachelines read before writing.
894 if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU))
895 *needs_clflush |= CLFLUSH_BEFORE;
899 intel_fb_obj_invalidate(obj, ORIGIN_CPU);
900 obj->mm.dirty = true;
901 /* return with the pages pinned */
905 i915_gem_object_unpin_pages(obj);
910 shmem_clflush_swizzled_range(char *addr, unsigned long length,
913 if (unlikely(swizzled)) {
914 unsigned long start = (unsigned long) addr;
915 unsigned long end = (unsigned long) addr + length;
917 /* For swizzling simply ensure that we always flush both
918 * channels. Lame, but simple and it works. Swizzled
919 * pwrite/pread is far from a hotpath - current userspace
920 * doesn't use it at all. */
921 start = round_down(start, 128);
922 end = round_up(end, 128);
924 drm_clflush_virt_range((void *)start, end - start);
926 drm_clflush_virt_range(addr, length);
931 /* Only difference to the fast-path function is that this can handle bit17
932 * and uses non-atomic copy and kmap functions. */
934 shmem_pread_slow(struct page *page, int offset, int length,
935 char __user *user_data,
936 bool page_do_bit17_swizzling, bool needs_clflush)
943 shmem_clflush_swizzled_range(vaddr + offset, length,
944 page_do_bit17_swizzling);
946 if (page_do_bit17_swizzling)
947 ret = __copy_to_user_swizzled(user_data, vaddr, offset, length);
949 ret = __copy_to_user(user_data, vaddr + offset, length);
952 return ret ? - EFAULT : 0;
956 shmem_pread(struct page *page, int offset, int length, char __user *user_data,
957 bool page_do_bit17_swizzling, bool needs_clflush)
962 if (!page_do_bit17_swizzling) {
963 char *vaddr = kmap_atomic(page);
966 drm_clflush_virt_range(vaddr + offset, length);
967 ret = __copy_to_user_inatomic(user_data, vaddr + offset, length);
968 kunmap_atomic(vaddr);
973 return shmem_pread_slow(page, offset, length, user_data,
974 page_do_bit17_swizzling, needs_clflush);
978 i915_gem_shmem_pread(struct drm_i915_gem_object *obj,
979 struct drm_i915_gem_pread *args)
981 char __user *user_data;
983 unsigned int obj_do_bit17_swizzling;
984 unsigned int needs_clflush;
985 unsigned int idx, offset;
988 obj_do_bit17_swizzling = 0;
989 if (i915_gem_object_needs_bit17_swizzle(obj))
990 obj_do_bit17_swizzling = BIT(17);
992 ret = mutex_lock_interruptible(&obj->base.dev->struct_mutex);
996 ret = i915_gem_obj_prepare_shmem_read(obj, &needs_clflush);
997 mutex_unlock(&obj->base.dev->struct_mutex);
1001 remain = args->size;
1002 user_data = u64_to_user_ptr(args->data_ptr);
1003 offset = offset_in_page(args->offset);
1004 for (idx = args->offset >> PAGE_SHIFT; remain; idx++) {
1005 struct page *page = i915_gem_object_get_page(obj, idx);
1009 if (offset + length > PAGE_SIZE)
1010 length = PAGE_SIZE - offset;
1012 ret = shmem_pread(page, offset, length, user_data,
1013 page_to_phys(page) & obj_do_bit17_swizzling,
1019 user_data += length;
1023 i915_gem_obj_finish_shmem_access(obj);
1028 gtt_user_read(struct io_mapping *mapping,
1029 loff_t base, int offset,
1030 char __user *user_data, int length)
1032 void __iomem *vaddr;
1033 unsigned long unwritten;
1035 /* We can use the cpu mem copy function because this is X86. */
1036 vaddr = io_mapping_map_atomic_wc(mapping, base);
1037 unwritten = __copy_to_user_inatomic(user_data,
1038 (void __force *)vaddr + offset,
1040 io_mapping_unmap_atomic(vaddr);
1042 vaddr = io_mapping_map_wc(mapping, base, PAGE_SIZE);
1043 unwritten = copy_to_user(user_data,
1044 (void __force *)vaddr + offset,
1046 io_mapping_unmap(vaddr);
1052 i915_gem_gtt_pread(struct drm_i915_gem_object *obj,
1053 const struct drm_i915_gem_pread *args)
1055 struct drm_i915_private *i915 = to_i915(obj->base.dev);
1056 struct i915_ggtt *ggtt = &i915->ggtt;
1057 struct drm_mm_node node;
1058 struct i915_vma *vma;
1059 void __user *user_data;
1063 ret = mutex_lock_interruptible(&i915->drm.struct_mutex);
1067 intel_runtime_pm_get(i915);
1068 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
1073 node.start = i915_ggtt_offset(vma);
1074 node.allocated = false;
1075 ret = i915_vma_put_fence(vma);
1077 i915_vma_unpin(vma);
1082 ret = insert_mappable_node(ggtt, &node, PAGE_SIZE);
1085 GEM_BUG_ON(!node.allocated);
1088 ret = i915_gem_object_set_to_gtt_domain(obj, false);
1092 mutex_unlock(&i915->drm.struct_mutex);
1094 user_data = u64_to_user_ptr(args->data_ptr);
1095 remain = args->size;
1096 offset = args->offset;
1098 while (remain > 0) {
1099 /* Operation in this page
1101 * page_base = page offset within aperture
1102 * page_offset = offset within page
1103 * page_length = bytes to copy for this page
1105 u32 page_base = node.start;
1106 unsigned page_offset = offset_in_page(offset);
1107 unsigned page_length = PAGE_SIZE - page_offset;
1108 page_length = remain < page_length ? remain : page_length;
1109 if (node.allocated) {
1111 ggtt->base.insert_page(&ggtt->base,
1112 i915_gem_object_get_dma_address(obj, offset >> PAGE_SHIFT),
1113 node.start, I915_CACHE_NONE, 0);
1116 page_base += offset & PAGE_MASK;
1119 if (gtt_user_read(&ggtt->iomap, page_base, page_offset,
1120 user_data, page_length)) {
1125 remain -= page_length;
1126 user_data += page_length;
1127 offset += page_length;
1130 mutex_lock(&i915->drm.struct_mutex);
1132 if (node.allocated) {
1134 ggtt->base.clear_range(&ggtt->base,
1135 node.start, node.size);
1136 remove_mappable_node(&node);
1138 i915_vma_unpin(vma);
1141 intel_runtime_pm_put(i915);
1142 mutex_unlock(&i915->drm.struct_mutex);
1148 * Reads data from the object referenced by handle.
1149 * @dev: drm device pointer
1150 * @data: ioctl data blob
1151 * @file: drm file pointer
1153 * On error, the contents of *data are undefined.
1156 i915_gem_pread_ioctl(struct drm_device *dev, void *data,
1157 struct drm_file *file)
1159 struct drm_i915_gem_pread *args = data;
1160 struct drm_i915_gem_object *obj;
1163 if (args->size == 0)
1166 if (!access_ok(VERIFY_WRITE,
1167 u64_to_user_ptr(args->data_ptr),
1171 obj = i915_gem_object_lookup(file, args->handle);
1175 /* Bounds check source. */
1176 if (range_overflows_t(u64, args->offset, args->size, obj->base.size)) {
1181 trace_i915_gem_object_pread(obj, args->offset, args->size);
1183 ret = i915_gem_object_wait(obj,
1184 I915_WAIT_INTERRUPTIBLE,
1185 MAX_SCHEDULE_TIMEOUT,
1186 to_rps_client(file));
1190 ret = i915_gem_object_pin_pages(obj);
1194 ret = i915_gem_shmem_pread(obj, args);
1195 if (ret == -EFAULT || ret == -ENODEV)
1196 ret = i915_gem_gtt_pread(obj, args);
1198 i915_gem_object_unpin_pages(obj);
1200 i915_gem_object_put(obj);
1204 /* This is the fast write path which cannot handle
1205 * page faults in the source data
1209 ggtt_write(struct io_mapping *mapping,
1210 loff_t base, int offset,
1211 char __user *user_data, int length)
1213 void __iomem *vaddr;
1214 unsigned long unwritten;
1216 /* We can use the cpu mem copy function because this is X86. */
1217 vaddr = io_mapping_map_atomic_wc(mapping, base);
1218 unwritten = __copy_from_user_inatomic_nocache((void __force *)vaddr + offset,
1220 io_mapping_unmap_atomic(vaddr);
1222 vaddr = io_mapping_map_wc(mapping, base, PAGE_SIZE);
1223 unwritten = copy_from_user((void __force *)vaddr + offset,
1225 io_mapping_unmap(vaddr);
1232 * This is the fast pwrite path, where we copy the data directly from the
1233 * user into the GTT, uncached.
1234 * @obj: i915 GEM object
1235 * @args: pwrite arguments structure
1238 i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
1239 const struct drm_i915_gem_pwrite *args)
1241 struct drm_i915_private *i915 = to_i915(obj->base.dev);
1242 struct i915_ggtt *ggtt = &i915->ggtt;
1243 struct drm_mm_node node;
1244 struct i915_vma *vma;
1246 void __user *user_data;
1249 ret = mutex_lock_interruptible(&i915->drm.struct_mutex);
1253 if (i915_gem_object_has_struct_page(obj)) {
1255 * Avoid waking the device up if we can fallback, as
1256 * waking/resuming is very slow (worst-case 10-100 ms
1257 * depending on PCI sleeps and our own resume time).
1258 * This easily dwarfs any performance advantage from
1259 * using the cache bypass of indirect GGTT access.
1261 if (!intel_runtime_pm_get_if_in_use(i915)) {
1266 /* No backing pages, no fallback, we must force GGTT access */
1267 intel_runtime_pm_get(i915);
1270 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
1275 node.start = i915_ggtt_offset(vma);
1276 node.allocated = false;
1277 ret = i915_vma_put_fence(vma);
1279 i915_vma_unpin(vma);
1284 ret = insert_mappable_node(ggtt, &node, PAGE_SIZE);
1287 GEM_BUG_ON(!node.allocated);
1290 ret = i915_gem_object_set_to_gtt_domain(obj, true);
1294 mutex_unlock(&i915->drm.struct_mutex);
1296 intel_fb_obj_invalidate(obj, ORIGIN_CPU);
1298 user_data = u64_to_user_ptr(args->data_ptr);
1299 offset = args->offset;
1300 remain = args->size;
1302 /* Operation in this page
1304 * page_base = page offset within aperture
1305 * page_offset = offset within page
1306 * page_length = bytes to copy for this page
1308 u32 page_base = node.start;
1309 unsigned int page_offset = offset_in_page(offset);
1310 unsigned int page_length = PAGE_SIZE - page_offset;
1311 page_length = remain < page_length ? remain : page_length;
1312 if (node.allocated) {
1313 wmb(); /* flush the write before we modify the GGTT */
1314 ggtt->base.insert_page(&ggtt->base,
1315 i915_gem_object_get_dma_address(obj, offset >> PAGE_SHIFT),
1316 node.start, I915_CACHE_NONE, 0);
1317 wmb(); /* flush modifications to the GGTT (insert_page) */
1319 page_base += offset & PAGE_MASK;
1321 /* If we get a fault while copying data, then (presumably) our
1322 * source page isn't available. Return the error and we'll
1323 * retry in the slow path.
1324 * If the object is non-shmem backed, we retry again with the
1325 * path that handles page fault.
1327 if (ggtt_write(&ggtt->iomap, page_base, page_offset,
1328 user_data, page_length)) {
1333 remain -= page_length;
1334 user_data += page_length;
1335 offset += page_length;
1337 intel_fb_obj_flush(obj, ORIGIN_CPU);
1339 mutex_lock(&i915->drm.struct_mutex);
1341 if (node.allocated) {
1343 ggtt->base.clear_range(&ggtt->base,
1344 node.start, node.size);
1345 remove_mappable_node(&node);
1347 i915_vma_unpin(vma);
1350 intel_runtime_pm_put(i915);
1352 mutex_unlock(&i915->drm.struct_mutex);
1357 shmem_pwrite_slow(struct page *page, int offset, int length,
1358 char __user *user_data,
1359 bool page_do_bit17_swizzling,
1360 bool needs_clflush_before,
1361 bool needs_clflush_after)
1367 if (unlikely(needs_clflush_before || page_do_bit17_swizzling))
1368 shmem_clflush_swizzled_range(vaddr + offset, length,
1369 page_do_bit17_swizzling);
1370 if (page_do_bit17_swizzling)
1371 ret = __copy_from_user_swizzled(vaddr, offset, user_data,
1374 ret = __copy_from_user(vaddr + offset, user_data, length);
1375 if (needs_clflush_after)
1376 shmem_clflush_swizzled_range(vaddr + offset, length,
1377 page_do_bit17_swizzling);
1380 return ret ? -EFAULT : 0;
1383 /* Per-page copy function for the shmem pwrite fastpath.
1384 * Flushes invalid cachelines before writing to the target if
1385 * needs_clflush_before is set and flushes out any written cachelines after
1386 * writing if needs_clflush is set.
1389 shmem_pwrite(struct page *page, int offset, int len, char __user *user_data,
1390 bool page_do_bit17_swizzling,
1391 bool needs_clflush_before,
1392 bool needs_clflush_after)
1397 if (!page_do_bit17_swizzling) {
1398 char *vaddr = kmap_atomic(page);
1400 if (needs_clflush_before)
1401 drm_clflush_virt_range(vaddr + offset, len);
1402 ret = __copy_from_user_inatomic(vaddr + offset, user_data, len);
1403 if (needs_clflush_after)
1404 drm_clflush_virt_range(vaddr + offset, len);
1406 kunmap_atomic(vaddr);
1411 return shmem_pwrite_slow(page, offset, len, user_data,
1412 page_do_bit17_swizzling,
1413 needs_clflush_before,
1414 needs_clflush_after);
1418 i915_gem_shmem_pwrite(struct drm_i915_gem_object *obj,
1419 const struct drm_i915_gem_pwrite *args)
1421 struct drm_i915_private *i915 = to_i915(obj->base.dev);
1422 void __user *user_data;
1424 unsigned int obj_do_bit17_swizzling;
1425 unsigned int partial_cacheline_write;
1426 unsigned int needs_clflush;
1427 unsigned int offset, idx;
1430 ret = mutex_lock_interruptible(&i915->drm.struct_mutex);
1434 ret = i915_gem_obj_prepare_shmem_write(obj, &needs_clflush);
1435 mutex_unlock(&i915->drm.struct_mutex);
1439 obj_do_bit17_swizzling = 0;
1440 if (i915_gem_object_needs_bit17_swizzle(obj))
1441 obj_do_bit17_swizzling = BIT(17);
1443 /* If we don't overwrite a cacheline completely we need to be
1444 * careful to have up-to-date data by first clflushing. Don't
1445 * overcomplicate things and flush the entire patch.
1447 partial_cacheline_write = 0;
1448 if (needs_clflush & CLFLUSH_BEFORE)
1449 partial_cacheline_write = boot_cpu_data.x86_clflush_size - 1;
1451 user_data = u64_to_user_ptr(args->data_ptr);
1452 remain = args->size;
1453 offset = offset_in_page(args->offset);
1454 for (idx = args->offset >> PAGE_SHIFT; remain; idx++) {
1455 struct page *page = i915_gem_object_get_page(obj, idx);
1459 if (offset + length > PAGE_SIZE)
1460 length = PAGE_SIZE - offset;
1462 ret = shmem_pwrite(page, offset, length, user_data,
1463 page_to_phys(page) & obj_do_bit17_swizzling,
1464 (offset | length) & partial_cacheline_write,
1465 needs_clflush & CLFLUSH_AFTER);
1470 user_data += length;
1474 intel_fb_obj_flush(obj, ORIGIN_CPU);
1475 i915_gem_obj_finish_shmem_access(obj);
1480 * Writes data to the object referenced by handle.
1482 * @data: ioctl data blob
1485 * On error, the contents of the buffer that were to be modified are undefined.
1488 i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
1489 struct drm_file *file)
1491 struct drm_i915_gem_pwrite *args = data;
1492 struct drm_i915_gem_object *obj;
1495 if (args->size == 0)
1498 if (!access_ok(VERIFY_READ,
1499 u64_to_user_ptr(args->data_ptr),
1503 obj = i915_gem_object_lookup(file, args->handle);
1507 /* Bounds check destination. */
1508 if (range_overflows_t(u64, args->offset, args->size, obj->base.size)) {
1513 trace_i915_gem_object_pwrite(obj, args->offset, args->size);
1516 if (obj->ops->pwrite)
1517 ret = obj->ops->pwrite(obj, args);
1521 ret = i915_gem_object_wait(obj,
1522 I915_WAIT_INTERRUPTIBLE |
1524 MAX_SCHEDULE_TIMEOUT,
1525 to_rps_client(file));
1529 ret = i915_gem_object_pin_pages(obj);
1534 /* We can only do the GTT pwrite on untiled buffers, as otherwise
1535 * it would end up going through the fenced access, and we'll get
1536 * different detiling behavior between reading and writing.
1537 * pread/pwrite currently are reading and writing from the CPU
1538 * perspective, requiring manual detiling by the client.
1540 if (!i915_gem_object_has_struct_page(obj) ||
1541 cpu_write_needs_clflush(obj))
1542 /* Note that the gtt paths might fail with non-page-backed user
1543 * pointers (e.g. gtt mappings when moving data between
1544 * textures). Fallback to the shmem path in that case.
1546 ret = i915_gem_gtt_pwrite_fast(obj, args);
1548 if (ret == -EFAULT || ret == -ENOSPC) {
1549 if (obj->phys_handle)
1550 ret = i915_gem_phys_pwrite(obj, args, file);
1552 ret = i915_gem_shmem_pwrite(obj, args);
1555 i915_gem_object_unpin_pages(obj);
1557 i915_gem_object_put(obj);
1561 static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj)
1563 struct drm_i915_private *i915;
1564 struct list_head *list;
1565 struct i915_vma *vma;
1567 GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
1569 for_each_ggtt_vma(vma, obj) {
1570 if (i915_vma_is_active(vma))
1573 if (!drm_mm_node_allocated(&vma->node))
1576 list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
1579 i915 = to_i915(obj->base.dev);
1580 spin_lock(&i915->mm.obj_lock);
1581 list = obj->bind_count ? &i915->mm.bound_list : &i915->mm.unbound_list;
1582 list_move_tail(&obj->mm.link, list);
1583 spin_unlock(&i915->mm.obj_lock);
1587 * Called when user space prepares to use an object with the CPU, either
1588 * through the mmap ioctl's mapping or a GTT mapping.
1590 * @data: ioctl data blob
1594 i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
1595 struct drm_file *file)
1597 struct drm_i915_gem_set_domain *args = data;
1598 struct drm_i915_gem_object *obj;
1599 uint32_t read_domains = args->read_domains;
1600 uint32_t write_domain = args->write_domain;
1603 /* Only handle setting domains to types used by the CPU. */
1604 if ((write_domain | read_domains) & I915_GEM_GPU_DOMAINS)
1607 /* Having something in the write domain implies it's in the read
1608 * domain, and only that read domain. Enforce that in the request.
1610 if (write_domain != 0 && read_domains != write_domain)
1613 obj = i915_gem_object_lookup(file, args->handle);
1617 /* Try to flush the object off the GPU without holding the lock.
1618 * We will repeat the flush holding the lock in the normal manner
1619 * to catch cases where we are gazumped.
1621 err = i915_gem_object_wait(obj,
1622 I915_WAIT_INTERRUPTIBLE |
1623 (write_domain ? I915_WAIT_ALL : 0),
1624 MAX_SCHEDULE_TIMEOUT,
1625 to_rps_client(file));
1630 * Proxy objects do not control access to the backing storage, ergo
1631 * they cannot be used as a means to manipulate the cache domain
1632 * tracking for that backing storage. The proxy object is always
1633 * considered to be outside of any cache domain.
1635 if (i915_gem_object_is_proxy(obj)) {
1641 * Flush and acquire obj->pages so that we are coherent through
1642 * direct access in memory with previous cached writes through
1643 * shmemfs and that our cache domain tracking remains valid.
1644 * For example, if the obj->filp was moved to swap without us
1645 * being notified and releasing the pages, we would mistakenly
1646 * continue to assume that the obj remained out of the CPU cached
1649 err = i915_gem_object_pin_pages(obj);
1653 err = i915_mutex_lock_interruptible(dev);
1657 if (read_domains & I915_GEM_DOMAIN_WC)
1658 err = i915_gem_object_set_to_wc_domain(obj, write_domain);
1659 else if (read_domains & I915_GEM_DOMAIN_GTT)
1660 err = i915_gem_object_set_to_gtt_domain(obj, write_domain);
1662 err = i915_gem_object_set_to_cpu_domain(obj, write_domain);
1664 /* And bump the LRU for this access */
1665 i915_gem_object_bump_inactive_ggtt(obj);
1667 mutex_unlock(&dev->struct_mutex);
1669 if (write_domain != 0)
1670 intel_fb_obj_invalidate(obj,
1671 fb_write_origin(obj, write_domain));
1674 i915_gem_object_unpin_pages(obj);
1676 i915_gem_object_put(obj);
1681 * Called when user space has done writes to this buffer
1683 * @data: ioctl data blob
1687 i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
1688 struct drm_file *file)
1690 struct drm_i915_gem_sw_finish *args = data;
1691 struct drm_i915_gem_object *obj;
1693 obj = i915_gem_object_lookup(file, args->handle);
1698 * Proxy objects are barred from CPU access, so there is no
1699 * need to ban sw_finish as it is a nop.
1702 /* Pinned buffers may be scanout, so flush the cache */
1703 i915_gem_object_flush_if_display(obj);
1704 i915_gem_object_put(obj);
1710 * i915_gem_mmap_ioctl - Maps the contents of an object, returning the address
1713 * @data: ioctl data blob
1716 * While the mapping holds a reference on the contents of the object, it doesn't
1717 * imply a ref on the object itself.
1721 * DRM driver writers who look a this function as an example for how to do GEM
1722 * mmap support, please don't implement mmap support like here. The modern way
1723 * to implement DRM mmap support is with an mmap offset ioctl (like
1724 * i915_gem_mmap_gtt) and then using the mmap syscall on the DRM fd directly.
1725 * That way debug tooling like valgrind will understand what's going on, hiding
1726 * the mmap call in a driver private ioctl will break that. The i915 driver only
1727 * does cpu mmaps this way because we didn't know better.
1730 i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
1731 struct drm_file *file)
1733 struct drm_i915_gem_mmap *args = data;
1734 struct drm_i915_gem_object *obj;
1737 if (args->flags & ~(I915_MMAP_WC))
1740 if (args->flags & I915_MMAP_WC && !boot_cpu_has(X86_FEATURE_PAT))
1743 obj = i915_gem_object_lookup(file, args->handle);
1747 /* prime objects have no backing filp to GEM mmap
1750 if (!obj->base.filp) {
1751 i915_gem_object_put(obj);
1755 addr = vm_mmap(obj->base.filp, 0, args->size,
1756 PROT_READ | PROT_WRITE, MAP_SHARED,
1758 if (args->flags & I915_MMAP_WC) {
1759 struct mm_struct *mm = current->mm;
1760 struct vm_area_struct *vma;
1762 if (down_write_killable(&mm->mmap_sem)) {
1763 i915_gem_object_put(obj);
1766 vma = find_vma(mm, addr);
1769 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
1772 up_write(&mm->mmap_sem);
1774 /* This may race, but that's ok, it only gets set */
1775 WRITE_ONCE(obj->frontbuffer_ggtt_origin, ORIGIN_CPU);
1777 i915_gem_object_put(obj);
1778 if (IS_ERR((void *)addr))
1781 args->addr_ptr = (uint64_t) addr;
1786 static unsigned int tile_row_pages(struct drm_i915_gem_object *obj)
1788 return i915_gem_object_get_tile_row_size(obj) >> PAGE_SHIFT;
1792 * i915_gem_mmap_gtt_version - report the current feature set for GTT mmaps
1794 * A history of the GTT mmap interface:
1796 * 0 - Everything had to fit into the GTT. Both parties of a memcpy had to
1797 * aligned and suitable for fencing, and still fit into the available
1798 * mappable space left by the pinned display objects. A classic problem
1799 * we called the page-fault-of-doom where we would ping-pong between
1800 * two objects that could not fit inside the GTT and so the memcpy
1801 * would page one object in at the expense of the other between every
1804 * 1 - Objects can be any size, and have any compatible fencing (X Y, or none
1805 * as set via i915_gem_set_tiling() [DRM_I915_GEM_SET_TILING]). If the
1806 * object is too large for the available space (or simply too large
1807 * for the mappable aperture!), a view is created instead and faulted
1808 * into userspace. (This view is aligned and sized appropriately for
1811 * 2 - Recognise WC as a separate cache domain so that we can flush the
1812 * delayed writes via GTT before performing direct access via WC.
1816 * * snoopable objects cannot be accessed via the GTT. It can cause machine
1817 * hangs on some architectures, corruption on others. An attempt to service
1818 * a GTT page fault from a snoopable object will generate a SIGBUS.
1820 * * the object must be able to fit into RAM (physical memory, though no
1821 * limited to the mappable aperture).
1826 * * a new GTT page fault will synchronize rendering from the GPU and flush
1827 * all data to system memory. Subsequent access will not be synchronized.
1829 * * all mappings are revoked on runtime device suspend.
1831 * * there are only 8, 16 or 32 fence registers to share between all users
1832 * (older machines require fence register for display and blitter access
1833 * as well). Contention of the fence registers will cause the previous users
1834 * to be unmapped and any new access will generate new page faults.
1836 * * running out of memory while servicing a fault may generate a SIGBUS,
1837 * rather than the expected SIGSEGV.
1839 int i915_gem_mmap_gtt_version(void)
1844 static inline struct i915_ggtt_view
1845 compute_partial_view(struct drm_i915_gem_object *obj,
1846 pgoff_t page_offset,
1849 struct i915_ggtt_view view;
1851 if (i915_gem_object_is_tiled(obj))
1852 chunk = roundup(chunk, tile_row_pages(obj));
1854 view.type = I915_GGTT_VIEW_PARTIAL;
1855 view.partial.offset = rounddown(page_offset, chunk);
1857 min_t(unsigned int, chunk,
1858 (obj->base.size >> PAGE_SHIFT) - view.partial.offset);
1860 /* If the partial covers the entire object, just create a normal VMA. */
1861 if (chunk >= obj->base.size >> PAGE_SHIFT)
1862 view.type = I915_GGTT_VIEW_NORMAL;
1868 * i915_gem_fault - fault a page into the GTT
1871 * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
1872 * from userspace. The fault handler takes care of binding the object to
1873 * the GTT (if needed), allocating and programming a fence register (again,
1874 * only if needed based on whether the old reg is still valid or the object
1875 * is tiled) and inserting a new PTE into the faulting process.
1877 * Note that the faulting process may involve evicting existing objects
1878 * from the GTT and/or fence registers to make room. So performance may
1879 * suffer if the GTT working set is large or there are few fence registers
1882 * The current feature set supported by i915_gem_fault() and thus GTT mmaps
1883 * is exposed via I915_PARAM_MMAP_GTT_VERSION (see i915_gem_mmap_gtt_version).
1885 int i915_gem_fault(struct vm_fault *vmf)
1887 #define MIN_CHUNK_PAGES ((1 << 20) >> PAGE_SHIFT) /* 1 MiB */
1888 struct vm_area_struct *area = vmf->vma;
1889 struct drm_i915_gem_object *obj = to_intel_bo(area->vm_private_data);
1890 struct drm_device *dev = obj->base.dev;
1891 struct drm_i915_private *dev_priv = to_i915(dev);
1892 struct i915_ggtt *ggtt = &dev_priv->ggtt;
1893 bool write = !!(vmf->flags & FAULT_FLAG_WRITE);
1894 struct i915_vma *vma;
1895 pgoff_t page_offset;
1899 /* We don't use vmf->pgoff since that has the fake offset */
1900 page_offset = (vmf->address - area->vm_start) >> PAGE_SHIFT;
1902 trace_i915_gem_object_fault(obj, page_offset, true, write);
1904 /* Try to flush the object off the GPU first without holding the lock.
1905 * Upon acquiring the lock, we will perform our sanity checks and then
1906 * repeat the flush holding the lock in the normal manner to catch cases
1907 * where we are gazumped.
1909 ret = i915_gem_object_wait(obj,
1910 I915_WAIT_INTERRUPTIBLE,
1911 MAX_SCHEDULE_TIMEOUT,
1916 ret = i915_gem_object_pin_pages(obj);
1920 intel_runtime_pm_get(dev_priv);
1922 ret = i915_mutex_lock_interruptible(dev);
1926 /* Access to snoopable pages through the GTT is incoherent. */
1927 if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(dev_priv)) {
1932 /* If the object is smaller than a couple of partial vma, it is
1933 * not worth only creating a single partial vma - we may as well
1934 * clear enough space for the full object.
1936 flags = PIN_MAPPABLE;
1937 if (obj->base.size > 2 * MIN_CHUNK_PAGES << PAGE_SHIFT)
1938 flags |= PIN_NONBLOCK | PIN_NONFAULT;
1940 /* Now pin it into the GTT as needed */
1941 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, flags);
1943 /* Use a partial view if it is bigger than available space */
1944 struct i915_ggtt_view view =
1945 compute_partial_view(obj, page_offset, MIN_CHUNK_PAGES);
1947 /* Userspace is now writing through an untracked VMA, abandon
1948 * all hope that the hardware is able to track future writes.
1950 obj->frontbuffer_ggtt_origin = ORIGIN_CPU;
1952 vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, PIN_MAPPABLE);
1959 ret = i915_gem_object_set_to_gtt_domain(obj, write);
1963 ret = i915_vma_pin_fence(vma);
1967 /* Finally, remap it using the new GTT offset */
1968 ret = remap_io_mapping(area,
1969 area->vm_start + (vma->ggtt_view.partial.offset << PAGE_SHIFT),
1970 (ggtt->gmadr.start + vma->node.start) >> PAGE_SHIFT,
1971 min_t(u64, vma->size, area->vm_end - area->vm_start),
1976 /* Mark as being mmapped into userspace for later revocation */
1977 assert_rpm_wakelock_held(dev_priv);
1978 if (!i915_vma_set_userfault(vma) && !obj->userfault_count++)
1979 list_add(&obj->userfault_link, &dev_priv->mm.userfault_list);
1980 GEM_BUG_ON(!obj->userfault_count);
1982 i915_vma_set_ggtt_write(vma);
1985 i915_vma_unpin_fence(vma);
1987 __i915_vma_unpin(vma);
1989 mutex_unlock(&dev->struct_mutex);
1991 intel_runtime_pm_put(dev_priv);
1992 i915_gem_object_unpin_pages(obj);
1997 * We eat errors when the gpu is terminally wedged to avoid
1998 * userspace unduly crashing (gl has no provisions for mmaps to
1999 * fail). But any other -EIO isn't ours (e.g. swap in failure)
2000 * and so needs to be reported.
2002 if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
2003 ret = VM_FAULT_SIGBUS;
2008 * EAGAIN means the gpu is hung and we'll wait for the error
2009 * handler to reset everything when re-faulting in
2010 * i915_mutex_lock_interruptible.
2017 * EBUSY is ok: this just means that another thread
2018 * already did the job.
2020 ret = VM_FAULT_NOPAGE;
2027 ret = VM_FAULT_SIGBUS;
2030 WARN_ONCE(ret, "unhandled error in i915_gem_fault: %i\n", ret);
2031 ret = VM_FAULT_SIGBUS;
2037 static void __i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
2039 struct i915_vma *vma;
2041 GEM_BUG_ON(!obj->userfault_count);
2043 obj->userfault_count = 0;
2044 list_del(&obj->userfault_link);
2045 drm_vma_node_unmap(&obj->base.vma_node,
2046 obj->base.dev->anon_inode->i_mapping);
2048 for_each_ggtt_vma(vma, obj)
2049 i915_vma_unset_userfault(vma);
2053 * i915_gem_release_mmap - remove physical page mappings
2054 * @obj: obj in question
2056 * Preserve the reservation of the mmapping with the DRM core code, but
2057 * relinquish ownership of the pages back to the system.
2059 * It is vital that we remove the page mapping if we have mapped a tiled
2060 * object through the GTT and then lose the fence register due to
2061 * resource pressure. Similarly if the object has been moved out of the
2062 * aperture, than pages mapped into userspace must be revoked. Removing the
2063 * mapping will then trigger a page fault on the next user access, allowing
2064 * fixup by i915_gem_fault().
2067 i915_gem_release_mmap(struct drm_i915_gem_object *obj)
2069 struct drm_i915_private *i915 = to_i915(obj->base.dev);
2071 /* Serialisation between user GTT access and our code depends upon
2072 * revoking the CPU's PTE whilst the mutex is held. The next user
2073 * pagefault then has to wait until we release the mutex.
2075 * Note that RPM complicates somewhat by adding an additional
2076 * requirement that operations to the GGTT be made holding the RPM
2079 lockdep_assert_held(&i915->drm.struct_mutex);
2080 intel_runtime_pm_get(i915);
2082 if (!obj->userfault_count)
2085 __i915_gem_object_release_mmap(obj);
2087 /* Ensure that the CPU's PTE are revoked and there are not outstanding
2088 * memory transactions from userspace before we return. The TLB
2089 * flushing implied above by changing the PTE above *should* be
2090 * sufficient, an extra barrier here just provides us with a bit
2091 * of paranoid documentation about our requirement to serialise
2092 * memory writes before touching registers / GSM.
2097 intel_runtime_pm_put(i915);
2100 void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
2102 struct drm_i915_gem_object *obj, *on;
2106 * Only called during RPM suspend. All users of the userfault_list
2107 * must be holding an RPM wakeref to ensure that this can not
2108 * run concurrently with themselves (and use the struct_mutex for
2109 * protection between themselves).
2112 list_for_each_entry_safe(obj, on,
2113 &dev_priv->mm.userfault_list, userfault_link)
2114 __i915_gem_object_release_mmap(obj);
2116 /* The fence will be lost when the device powers down. If any were
2117 * in use by hardware (i.e. they are pinned), we should not be powering
2118 * down! All other fences will be reacquired by the user upon waking.
2120 for (i = 0; i < dev_priv->num_fence_regs; i++) {
2121 struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
2123 /* Ideally we want to assert that the fence register is not
2124 * live at this point (i.e. that no piece of code will be
2125 * trying to write through fence + GTT, as that both violates
2126 * our tracking of activity and associated locking/barriers,
2127 * but also is illegal given that the hw is powered down).
2129 * Previously we used reg->pin_count as a "liveness" indicator.
2130 * That is not sufficient, and we need a more fine-grained
2131 * tool if we want to have a sanity check here.
2137 GEM_BUG_ON(i915_vma_has_userfault(reg->vma));
2142 static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj)
2144 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
2147 err = drm_gem_create_mmap_offset(&obj->base);
2151 /* Attempt to reap some mmap space from dead objects */
2153 err = i915_gem_wait_for_idle(dev_priv, I915_WAIT_INTERRUPTIBLE);
2157 i915_gem_drain_freed_objects(dev_priv);
2158 err = drm_gem_create_mmap_offset(&obj->base);
2162 } while (flush_delayed_work(&dev_priv->gt.retire_work));
2167 static void i915_gem_object_free_mmap_offset(struct drm_i915_gem_object *obj)
2169 drm_gem_free_mmap_offset(&obj->base);
2173 i915_gem_mmap_gtt(struct drm_file *file,
2174 struct drm_device *dev,
2178 struct drm_i915_gem_object *obj;
2181 obj = i915_gem_object_lookup(file, handle);
2185 ret = i915_gem_object_create_mmap_offset(obj);
2187 *offset = drm_vma_node_offset_addr(&obj->base.vma_node);
2189 i915_gem_object_put(obj);
2194 * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
2196 * @data: GTT mapping ioctl data
2197 * @file: GEM object info
2199 * Simply returns the fake offset to userspace so it can mmap it.
2200 * The mmap call will end up in drm_gem_mmap(), which will set things
2201 * up so we can get faults in the handler above.
2203 * The fault handler will take care of binding the object into the GTT
2204 * (since it may have been evicted to make room for something), allocating
2205 * a fence register, and mapping the appropriate aperture address into
2209 i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
2210 struct drm_file *file)
2212 struct drm_i915_gem_mmap_gtt *args = data;
2214 return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
2217 /* Immediately discard the backing storage */
2219 i915_gem_object_truncate(struct drm_i915_gem_object *obj)
2221 i915_gem_object_free_mmap_offset(obj);
2223 if (obj->base.filp == NULL)
2226 /* Our goal here is to return as much of the memory as
2227 * is possible back to the system as we are called from OOM.
2228 * To do this we must instruct the shmfs to drop all of its
2229 * backing pages, *now*.
2231 shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1);
2232 obj->mm.madv = __I915_MADV_PURGED;
2233 obj->mm.pages = ERR_PTR(-EFAULT);
2236 /* Try to discard unwanted pages */
2237 void __i915_gem_object_invalidate(struct drm_i915_gem_object *obj)
2239 struct address_space *mapping;
2241 lockdep_assert_held(&obj->mm.lock);
2242 GEM_BUG_ON(i915_gem_object_has_pages(obj));
2244 switch (obj->mm.madv) {
2245 case I915_MADV_DONTNEED:
2246 i915_gem_object_truncate(obj);
2247 case __I915_MADV_PURGED:
2251 if (obj->base.filp == NULL)
2254 mapping = obj->base.filp->f_mapping,
2255 invalidate_mapping_pages(mapping, 0, (loff_t)-1);
2259 i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj,
2260 struct sg_table *pages)
2262 struct sgt_iter sgt_iter;
2265 __i915_gem_object_release_shmem(obj, pages, true);
2267 i915_gem_gtt_finish_pages(obj, pages);
2269 if (i915_gem_object_needs_bit17_swizzle(obj))
2270 i915_gem_object_save_bit_17_swizzle(obj, pages);
2272 for_each_sgt_page(page, sgt_iter, pages) {
2274 set_page_dirty(page);
2276 if (obj->mm.madv == I915_MADV_WILLNEED)
2277 mark_page_accessed(page);
2281 obj->mm.dirty = false;
2283 sg_free_table(pages);
2287 static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj)
2289 struct radix_tree_iter iter;
2293 radix_tree_for_each_slot(slot, &obj->mm.get_page.radix, &iter, 0)
2294 radix_tree_delete(&obj->mm.get_page.radix, iter.index);
2298 void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
2299 enum i915_mm_subclass subclass)
2301 struct drm_i915_private *i915 = to_i915(obj->base.dev);
2302 struct sg_table *pages;
2304 if (i915_gem_object_has_pinned_pages(obj))
2307 GEM_BUG_ON(obj->bind_count);
2308 if (!i915_gem_object_has_pages(obj))
2311 /* May be called by shrinker from within get_pages() (on another bo) */
2312 mutex_lock_nested(&obj->mm.lock, subclass);
2313 if (unlikely(atomic_read(&obj->mm.pages_pin_count)))
2316 /* ->put_pages might need to allocate memory for the bit17 swizzle
2317 * array, hence protect them from being reaped by removing them from gtt
2319 pages = fetch_and_zero(&obj->mm.pages);
2322 spin_lock(&i915->mm.obj_lock);
2323 list_del(&obj->mm.link);
2324 spin_unlock(&i915->mm.obj_lock);
2326 if (obj->mm.mapping) {
2329 ptr = page_mask_bits(obj->mm.mapping);
2330 if (is_vmalloc_addr(ptr))
2333 kunmap(kmap_to_page(ptr));
2335 obj->mm.mapping = NULL;
2338 __i915_gem_object_reset_page_iter(obj);
2341 obj->ops->put_pages(obj, pages);
2343 obj->mm.page_sizes.phys = obj->mm.page_sizes.sg = 0;
2346 mutex_unlock(&obj->mm.lock);
2349 static bool i915_sg_trim(struct sg_table *orig_st)
2351 struct sg_table new_st;
2352 struct scatterlist *sg, *new_sg;
2355 if (orig_st->nents == orig_st->orig_nents)
2358 if (sg_alloc_table(&new_st, orig_st->nents, GFP_KERNEL | __GFP_NOWARN))
2361 new_sg = new_st.sgl;
2362 for_each_sg(orig_st->sgl, sg, orig_st->nents, i) {
2363 sg_set_page(new_sg, sg_page(sg), sg->length, 0);
2364 /* called before being DMA mapped, no need to copy sg->dma_* */
2365 new_sg = sg_next(new_sg);
2367 GEM_BUG_ON(new_sg); /* Should walk exactly nents and hit the end */
2369 sg_free_table(orig_st);
2375 static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
2377 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
2378 const unsigned long page_count = obj->base.size / PAGE_SIZE;
2380 struct address_space *mapping;
2381 struct sg_table *st;
2382 struct scatterlist *sg;
2383 struct sgt_iter sgt_iter;
2385 unsigned long last_pfn = 0; /* suppress gcc warning */
2386 unsigned int max_segment = i915_sg_segment_size();
2387 unsigned int sg_page_sizes;
2391 /* Assert that the object is not currently in any GPU domain. As it
2392 * wasn't in the GTT, there shouldn't be any way it could have been in
2395 GEM_BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
2396 GEM_BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
2398 st = kmalloc(sizeof(*st), GFP_KERNEL);
2403 if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
2408 /* Get the list of pages out of our struct file. They'll be pinned
2409 * at this point until we release them.
2411 * Fail silently without starting the shrinker
2413 mapping = obj->base.filp->f_mapping;
2414 noreclaim = mapping_gfp_constraint(mapping, ~__GFP_RECLAIM);
2415 noreclaim |= __GFP_NORETRY | __GFP_NOWARN;
2420 for (i = 0; i < page_count; i++) {
2421 const unsigned int shrink[] = {
2422 I915_SHRINK_BOUND | I915_SHRINK_UNBOUND | I915_SHRINK_PURGEABLE,
2425 gfp_t gfp = noreclaim;
2428 page = shmem_read_mapping_page_gfp(mapping, i, gfp);
2429 if (likely(!IS_ERR(page)))
2433 ret = PTR_ERR(page);
2437 i915_gem_shrink(dev_priv, 2 * page_count, NULL, *s++);
2440 /* We've tried hard to allocate the memory by reaping
2441 * our own buffer, now let the real VM do its job and
2442 * go down in flames if truly OOM.
2444 * However, since graphics tend to be disposable,
2445 * defer the oom here by reporting the ENOMEM back
2449 /* reclaim and warn, but no oom */
2450 gfp = mapping_gfp_mask(mapping);
2452 /* Our bo are always dirty and so we require
2453 * kswapd to reclaim our pages (direct reclaim
2454 * does not effectively begin pageout of our
2455 * buffers on its own). However, direct reclaim
2456 * only waits for kswapd when under allocation
2457 * congestion. So as a result __GFP_RECLAIM is
2458 * unreliable and fails to actually reclaim our
2459 * dirty pages -- unless you try over and over
2460 * again with !__GFP_NORETRY. However, we still
2461 * want to fail this allocation rather than
2462 * trigger the out-of-memory killer and for
2463 * this we want __GFP_RETRY_MAYFAIL.
2465 gfp |= __GFP_RETRY_MAYFAIL;
2470 sg->length >= max_segment ||
2471 page_to_pfn(page) != last_pfn + 1) {
2473 sg_page_sizes |= sg->length;
2477 sg_set_page(sg, page, PAGE_SIZE, 0);
2479 sg->length += PAGE_SIZE;
2481 last_pfn = page_to_pfn(page);
2483 /* Check that the i965g/gm workaround works. */
2484 WARN_ON((gfp & __GFP_DMA32) && (last_pfn >= 0x00100000UL));
2486 if (sg) { /* loop terminated early; short sg table */
2487 sg_page_sizes |= sg->length;
2491 /* Trim unused sg entries to avoid wasting memory. */
2494 ret = i915_gem_gtt_prepare_pages(obj, st);
2496 /* DMA remapping failed? One possible cause is that
2497 * it could not reserve enough large entries, asking
2498 * for PAGE_SIZE chunks instead may be helpful.
2500 if (max_segment > PAGE_SIZE) {
2501 for_each_sgt_page(page, sgt_iter, st)
2505 max_segment = PAGE_SIZE;
2508 dev_warn(&dev_priv->drm.pdev->dev,
2509 "Failed to DMA remap %lu pages\n",
2515 if (i915_gem_object_needs_bit17_swizzle(obj))
2516 i915_gem_object_do_bit_17_swizzle(obj, st);
2518 __i915_gem_object_set_pages(obj, st, sg_page_sizes);
2525 for_each_sgt_page(page, sgt_iter, st)
2530 /* shmemfs first checks if there is enough memory to allocate the page
2531 * and reports ENOSPC should there be insufficient, along with the usual
2532 * ENOMEM for a genuine allocation failure.
2534 * We use ENOSPC in our driver to mean that we have run out of aperture
2535 * space and so want to translate the error from shmemfs back to our
2536 * usual understanding of ENOMEM.
2544 void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
2545 struct sg_table *pages,
2546 unsigned int sg_page_sizes)
2548 struct drm_i915_private *i915 = to_i915(obj->base.dev);
2549 unsigned long supported = INTEL_INFO(i915)->page_sizes;
2552 lockdep_assert_held(&obj->mm.lock);
2554 obj->mm.get_page.sg_pos = pages->sgl;
2555 obj->mm.get_page.sg_idx = 0;
2557 obj->mm.pages = pages;
2559 if (i915_gem_object_is_tiled(obj) &&
2560 i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
2561 GEM_BUG_ON(obj->mm.quirked);
2562 __i915_gem_object_pin_pages(obj);
2563 obj->mm.quirked = true;
2566 GEM_BUG_ON(!sg_page_sizes);
2567 obj->mm.page_sizes.phys = sg_page_sizes;
2570 * Calculate the supported page-sizes which fit into the given
2571 * sg_page_sizes. This will give us the page-sizes which we may be able
2572 * to use opportunistically when later inserting into the GTT. For
2573 * example if phys=2G, then in theory we should be able to use 1G, 2M,
2574 * 64K or 4K pages, although in practice this will depend on a number of
2577 obj->mm.page_sizes.sg = 0;
2578 for_each_set_bit(i, &supported, ilog2(I915_GTT_MAX_PAGE_SIZE) + 1) {
2579 if (obj->mm.page_sizes.phys & ~0u << i)
2580 obj->mm.page_sizes.sg |= BIT(i);
2582 GEM_BUG_ON(!HAS_PAGE_SIZES(i915, obj->mm.page_sizes.sg));
2584 spin_lock(&i915->mm.obj_lock);
2585 list_add(&obj->mm.link, &i915->mm.unbound_list);
2586 spin_unlock(&i915->mm.obj_lock);
2589 static int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
2593 if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) {
2594 DRM_DEBUG("Attempting to obtain a purgeable object\n");
2598 err = obj->ops->get_pages(obj);
2599 GEM_BUG_ON(!err && !i915_gem_object_has_pages(obj));
2604 /* Ensure that the associated pages are gathered from the backing storage
2605 * and pinned into our object. i915_gem_object_pin_pages() may be called
2606 * multiple times before they are released by a single call to
2607 * i915_gem_object_unpin_pages() - once the pages are no longer referenced
2608 * either as a result of memory pressure (reaping pages under the shrinker)
2609 * or as the object is itself released.
2611 int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
2615 err = mutex_lock_interruptible(&obj->mm.lock);
2619 if (unlikely(!i915_gem_object_has_pages(obj))) {
2620 GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj));
2622 err = ____i915_gem_object_get_pages(obj);
2626 smp_mb__before_atomic();
2628 atomic_inc(&obj->mm.pages_pin_count);
2631 mutex_unlock(&obj->mm.lock);
2635 /* The 'mapping' part of i915_gem_object_pin_map() below */
2636 static void *i915_gem_object_map(const struct drm_i915_gem_object *obj,
2637 enum i915_map_type type)
2639 unsigned long n_pages = obj->base.size >> PAGE_SHIFT;
2640 struct sg_table *sgt = obj->mm.pages;
2641 struct sgt_iter sgt_iter;
2643 struct page *stack_pages[32];
2644 struct page **pages = stack_pages;
2645 unsigned long i = 0;
2649 /* A single page can always be kmapped */
2650 if (n_pages == 1 && type == I915_MAP_WB)
2651 return kmap(sg_page(sgt->sgl));
2653 if (n_pages > ARRAY_SIZE(stack_pages)) {
2654 /* Too big for stack -- allocate temporary array instead */
2655 pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL);
2660 for_each_sgt_page(page, sgt_iter, sgt)
2663 /* Check that we have the expected number of pages */
2664 GEM_BUG_ON(i != n_pages);
2669 /* fallthrough to use PAGE_KERNEL anyway */
2671 pgprot = PAGE_KERNEL;
2674 pgprot = pgprot_writecombine(PAGE_KERNEL_IO);
2677 addr = vmap(pages, n_pages, 0, pgprot);
2679 if (pages != stack_pages)
2685 /* get, pin, and map the pages of the object into kernel space */
2686 void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
2687 enum i915_map_type type)
2689 enum i915_map_type has_type;
2694 if (unlikely(!i915_gem_object_has_struct_page(obj)))
2695 return ERR_PTR(-ENXIO);
2697 ret = mutex_lock_interruptible(&obj->mm.lock);
2699 return ERR_PTR(ret);
2701 pinned = !(type & I915_MAP_OVERRIDE);
2702 type &= ~I915_MAP_OVERRIDE;
2704 if (!atomic_inc_not_zero(&obj->mm.pages_pin_count)) {
2705 if (unlikely(!i915_gem_object_has_pages(obj))) {
2706 GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj));
2708 ret = ____i915_gem_object_get_pages(obj);
2712 smp_mb__before_atomic();
2714 atomic_inc(&obj->mm.pages_pin_count);
2717 GEM_BUG_ON(!i915_gem_object_has_pages(obj));
2719 ptr = page_unpack_bits(obj->mm.mapping, &has_type);
2720 if (ptr && has_type != type) {
2726 if (is_vmalloc_addr(ptr))
2729 kunmap(kmap_to_page(ptr));
2731 ptr = obj->mm.mapping = NULL;
2735 ptr = i915_gem_object_map(obj, type);
2741 obj->mm.mapping = page_pack_bits(ptr, type);
2745 mutex_unlock(&obj->mm.lock);
2749 atomic_dec(&obj->mm.pages_pin_count);
2756 i915_gem_object_pwrite_gtt(struct drm_i915_gem_object *obj,
2757 const struct drm_i915_gem_pwrite *arg)
2759 struct address_space *mapping = obj->base.filp->f_mapping;
2760 char __user *user_data = u64_to_user_ptr(arg->data_ptr);
2764 /* Before we instantiate/pin the backing store for our use, we
2765 * can prepopulate the shmemfs filp efficiently using a write into
2766 * the pagecache. We avoid the penalty of instantiating all the
2767 * pages, important if the user is just writing to a few and never
2768 * uses the object on the GPU, and using a direct write into shmemfs
2769 * allows it to avoid the cost of retrieving a page (either swapin
2770 * or clearing-before-use) before it is overwritten.
2772 if (i915_gem_object_has_pages(obj))
2775 if (obj->mm.madv != I915_MADV_WILLNEED)
2778 /* Before the pages are instantiated the object is treated as being
2779 * in the CPU domain. The pages will be clflushed as required before
2780 * use, and we can freely write into the pages directly. If userspace
2781 * races pwrite with any other operation; corruption will ensue -
2782 * that is userspace's prerogative!
2786 offset = arg->offset;
2787 pg = offset_in_page(offset);
2790 unsigned int len, unwritten;
2795 len = PAGE_SIZE - pg;
2799 err = pagecache_write_begin(obj->base.filp, mapping,
2806 unwritten = copy_from_user(vaddr + pg, user_data, len);
2809 err = pagecache_write_end(obj->base.filp, mapping,
2810 offset, len, len - unwritten,
2827 static bool ban_context(const struct i915_gem_context *ctx,
2830 return (i915_gem_context_is_bannable(ctx) &&
2831 score >= CONTEXT_SCORE_BAN_THRESHOLD);
2834 static void i915_gem_context_mark_guilty(struct i915_gem_context *ctx)
2839 atomic_inc(&ctx->guilty_count);
2841 score = atomic_add_return(CONTEXT_SCORE_GUILTY, &ctx->ban_score);
2842 banned = ban_context(ctx, score);
2843 DRM_DEBUG_DRIVER("context %s marked guilty (score %d) banned? %s\n",
2844 ctx->name, score, yesno(banned));
2848 i915_gem_context_set_banned(ctx);
2849 if (!IS_ERR_OR_NULL(ctx->file_priv)) {
2850 atomic_inc(&ctx->file_priv->context_bans);
2851 DRM_DEBUG_DRIVER("client %s has had %d context banned\n",
2852 ctx->name, atomic_read(&ctx->file_priv->context_bans));
2856 static void i915_gem_context_mark_innocent(struct i915_gem_context *ctx)
2858 atomic_inc(&ctx->active_count);
2861 struct drm_i915_gem_request *
2862 i915_gem_find_active_request(struct intel_engine_cs *engine)
2864 struct drm_i915_gem_request *request, *active = NULL;
2865 unsigned long flags;
2867 /* We are called by the error capture and reset at a random
2868 * point in time. In particular, note that neither is crucially
2869 * ordered with an interrupt. After a hang, the GPU is dead and we
2870 * assume that no more writes can happen (we waited long enough for
2871 * all writes that were in transaction to be flushed) - adding an
2872 * extra delay for a recent interrupt is pointless. Hence, we do
2873 * not need an engine->irq_seqno_barrier() before the seqno reads.
2875 spin_lock_irqsave(&engine->timeline->lock, flags);
2876 list_for_each_entry(request, &engine->timeline->requests, link) {
2877 if (__i915_gem_request_completed(request,
2878 request->global_seqno))
2881 GEM_BUG_ON(request->engine != engine);
2882 GEM_BUG_ON(test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
2883 &request->fence.flags));
2888 spin_unlock_irqrestore(&engine->timeline->lock, flags);
2893 static bool engine_stalled(struct intel_engine_cs *engine)
2895 if (!engine->hangcheck.stalled)
2898 /* Check for possible seqno movement after hang declaration */
2899 if (engine->hangcheck.seqno != intel_engine_get_seqno(engine)) {
2900 DRM_DEBUG_DRIVER("%s pardoned\n", engine->name);
2908 * Ensure irq handler finishes, and not run again.
2909 * Also return the active request so that we only search for it once.
2911 struct drm_i915_gem_request *
2912 i915_gem_reset_prepare_engine(struct intel_engine_cs *engine)
2914 struct drm_i915_gem_request *request = NULL;
2917 * During the reset sequence, we must prevent the engine from
2918 * entering RC6. As the context state is undefined until we restart
2919 * the engine, if it does enter RC6 during the reset, the state
2920 * written to the powercontext is undefined and so we may lose
2921 * GPU state upon resume, i.e. fail to restart after a reset.
2923 intel_uncore_forcewake_get(engine->i915, FORCEWAKE_ALL);
2926 * Prevent the signaler thread from updating the request
2927 * state (by calling dma_fence_signal) as we are processing
2928 * the reset. The write from the GPU of the seqno is
2929 * asynchronous and the signaler thread may see a different
2930 * value to us and declare the request complete, even though
2931 * the reset routine have picked that request as the active
2932 * (incomplete) request. This conflict is not handled
2935 kthread_park(engine->breadcrumbs.signaler);
2938 * Prevent request submission to the hardware until we have
2939 * completed the reset in i915_gem_reset_finish(). If a request
2940 * is completed by one engine, it may then queue a request
2941 * to a second via its execlists->tasklet *just* as we are
2942 * calling engine->init_hw() and also writing the ELSP.
2943 * Turning off the execlists->tasklet until the reset is over
2944 * prevents the race.
2946 tasklet_kill(&engine->execlists.tasklet);
2947 tasklet_disable(&engine->execlists.tasklet);
2950 * We're using worker to queue preemption requests from the tasklet in
2951 * GuC submission mode.
2952 * Even though tasklet was disabled, we may still have a worker queued.
2953 * Let's make sure that all workers scheduled before disabling the
2954 * tasklet are completed before continuing with the reset.
2956 if (engine->i915->guc.preempt_wq)
2957 flush_workqueue(engine->i915->guc.preempt_wq);
2959 if (engine->irq_seqno_barrier)
2960 engine->irq_seqno_barrier(engine);
2962 request = i915_gem_find_active_request(engine);
2963 if (request && request->fence.error == -EIO)
2964 request = ERR_PTR(-EIO); /* Previous reset failed! */
2969 int i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
2971 struct intel_engine_cs *engine;
2972 struct drm_i915_gem_request *request;
2973 enum intel_engine_id id;
2976 for_each_engine(engine, dev_priv, id) {
2977 request = i915_gem_reset_prepare_engine(engine);
2978 if (IS_ERR(request)) {
2979 err = PTR_ERR(request);
2983 engine->hangcheck.active_request = request;
2986 i915_gem_revoke_fences(dev_priv);
2991 static void skip_request(struct drm_i915_gem_request *request)
2993 void *vaddr = request->ring->vaddr;
2996 /* As this request likely depends on state from the lost
2997 * context, clear out all the user operations leaving the
2998 * breadcrumb at the end (so we get the fence notifications).
3000 head = request->head;
3001 if (request->postfix < head) {
3002 memset(vaddr + head, 0, request->ring->size - head);
3005 memset(vaddr + head, 0, request->postfix - head);
3007 dma_fence_set_error(&request->fence, -EIO);
3010 static void engine_skip_context(struct drm_i915_gem_request *request)
3012 struct intel_engine_cs *engine = request->engine;
3013 struct i915_gem_context *hung_ctx = request->ctx;
3014 struct intel_timeline *timeline;
3015 unsigned long flags;
3017 timeline = i915_gem_context_lookup_timeline(hung_ctx, engine);
3019 spin_lock_irqsave(&engine->timeline->lock, flags);
3020 spin_lock(&timeline->lock);
3022 list_for_each_entry_continue(request, &engine->timeline->requests, link)
3023 if (request->ctx == hung_ctx)
3024 skip_request(request);
3026 list_for_each_entry(request, &timeline->requests, link)
3027 skip_request(request);
3029 spin_unlock(&timeline->lock);
3030 spin_unlock_irqrestore(&engine->timeline->lock, flags);
3033 /* Returns the request if it was guilty of the hang */
3034 static struct drm_i915_gem_request *
3035 i915_gem_reset_request(struct intel_engine_cs *engine,
3036 struct drm_i915_gem_request *request)
3038 /* The guilty request will get skipped on a hung engine.
3040 * Users of client default contexts do not rely on logical
3041 * state preserved between batches so it is safe to execute
3042 * queued requests following the hang. Non default contexts
3043 * rely on preserved state, so skipping a batch loses the
3044 * evolution of the state and it needs to be considered corrupted.
3045 * Executing more queued batches on top of corrupted state is
3046 * risky. But we take the risk by trying to advance through
3047 * the queued requests in order to make the client behaviour
3048 * more predictable around resets, by not throwing away random
3049 * amount of batches it has prepared for execution. Sophisticated
3050 * clients can use gem_reset_stats_ioctl and dma fence status
3051 * (exported via sync_file info ioctl on explicit fences) to observe
3052 * when it loses the context state and should rebuild accordingly.
3054 * The context ban, and ultimately the client ban, mechanism are safety
3055 * valves if client submission ends up resulting in nothing more than
3059 if (engine_stalled(engine)) {
3060 i915_gem_context_mark_guilty(request->ctx);
3061 skip_request(request);
3063 /* If this context is now banned, skip all pending requests. */
3064 if (i915_gem_context_is_banned(request->ctx))
3065 engine_skip_context(request);
3068 * Since this is not the hung engine, it may have advanced
3069 * since the hang declaration. Double check by refinding
3070 * the active request at the time of the reset.
3072 request = i915_gem_find_active_request(engine);
3074 i915_gem_context_mark_innocent(request->ctx);
3075 dma_fence_set_error(&request->fence, -EAGAIN);
3077 /* Rewind the engine to replay the incomplete rq */
3078 spin_lock_irq(&engine->timeline->lock);
3079 request = list_prev_entry(request, link);
3080 if (&request->link == &engine->timeline->requests)
3082 spin_unlock_irq(&engine->timeline->lock);
3089 void i915_gem_reset_engine(struct intel_engine_cs *engine,
3090 struct drm_i915_gem_request *request)
3093 * Make sure this write is visible before we re-enable the interrupt
3094 * handlers on another CPU, as tasklet_enable() resolves to just
3095 * a compiler barrier which is insufficient for our purpose here.
3097 smp_store_mb(engine->irq_posted, 0);
3100 request = i915_gem_reset_request(engine, request);
3103 DRM_DEBUG_DRIVER("resetting %s to restart from tail of request 0x%x\n",
3104 engine->name, request->global_seqno);
3107 /* Setup the CS to resume from the breadcrumb of the hung request */
3108 engine->reset_hw(engine, request);
3111 void i915_gem_reset(struct drm_i915_private *dev_priv)
3113 struct intel_engine_cs *engine;
3114 enum intel_engine_id id;
3116 lockdep_assert_held(&dev_priv->drm.struct_mutex);
3118 i915_gem_retire_requests(dev_priv);
3120 for_each_engine(engine, dev_priv, id) {
3121 struct i915_gem_context *ctx;
3123 i915_gem_reset_engine(engine, engine->hangcheck.active_request);
3124 ctx = fetch_and_zero(&engine->last_retired_context);
3126 engine->context_unpin(engine, ctx);
3129 * Ostensibily, we always want a context loaded for powersaving,
3130 * so if the engine is idle after the reset, send a request
3131 * to load our scratch kernel_context.
3133 * More mysteriously, if we leave the engine idle after a reset,
3134 * the next userspace batch may hang, with what appears to be
3135 * an incoherent read by the CS (presumably stale TLB). An
3136 * empty request appears sufficient to paper over the glitch.
3138 if (list_empty(&engine->timeline->requests)) {
3139 struct drm_i915_gem_request *rq;
3141 rq = i915_gem_request_alloc(engine,
3142 dev_priv->kernel_context);
3144 __i915_add_request(rq, false);
3148 i915_gem_restore_fences(dev_priv);
3150 if (dev_priv->gt.awake) {
3151 intel_sanitize_gt_powersave(dev_priv);
3152 intel_enable_gt_powersave(dev_priv);
3153 if (INTEL_GEN(dev_priv) >= 6)
3154 gen6_rps_busy(dev_priv);
3158 void i915_gem_reset_finish_engine(struct intel_engine_cs *engine)
3160 tasklet_enable(&engine->execlists.tasklet);
3161 kthread_unpark(engine->breadcrumbs.signaler);
3163 intel_uncore_forcewake_put(engine->i915, FORCEWAKE_ALL);
3166 void i915_gem_reset_finish(struct drm_i915_private *dev_priv)
3168 struct intel_engine_cs *engine;
3169 enum intel_engine_id id;
3171 lockdep_assert_held(&dev_priv->drm.struct_mutex);
3173 for_each_engine(engine, dev_priv, id) {
3174 engine->hangcheck.active_request = NULL;
3175 i915_gem_reset_finish_engine(engine);
3179 static void nop_submit_request(struct drm_i915_gem_request *request)
3181 dma_fence_set_error(&request->fence, -EIO);
3183 i915_gem_request_submit(request);
3186 static void nop_complete_submit_request(struct drm_i915_gem_request *request)
3188 unsigned long flags;
3190 dma_fence_set_error(&request->fence, -EIO);
3192 spin_lock_irqsave(&request->engine->timeline->lock, flags);
3193 __i915_gem_request_submit(request);
3194 intel_engine_init_global_seqno(request->engine, request->global_seqno);
3195 spin_unlock_irqrestore(&request->engine->timeline->lock, flags);
3198 void i915_gem_set_wedged(struct drm_i915_private *i915)
3200 struct intel_engine_cs *engine;
3201 enum intel_engine_id id;
3204 * First, stop submission to hw, but do not yet complete requests by
3205 * rolling the global seqno forward (since this would complete requests
3206 * for which we haven't set the fence error to EIO yet).
3208 for_each_engine(engine, i915, id)
3209 engine->submit_request = nop_submit_request;
3212 * Make sure no one is running the old callback before we proceed with
3213 * cancelling requests and resetting the completion tracking. Otherwise
3214 * we might submit a request to the hardware which never completes.
3218 for_each_engine(engine, i915, id) {
3219 /* Mark all executing requests as skipped */
3220 engine->cancel_requests(engine);
3223 * Only once we've force-cancelled all in-flight requests can we
3224 * start to complete all requests.
3226 engine->submit_request = nop_complete_submit_request;
3230 * Make sure no request can slip through without getting completed by
3231 * either this call here to intel_engine_init_global_seqno, or the one
3232 * in nop_complete_submit_request.
3236 for_each_engine(engine, i915, id) {
3237 unsigned long flags;
3239 /* Mark all pending requests as complete so that any concurrent
3240 * (lockless) lookup doesn't try and wait upon the request as we
3243 spin_lock_irqsave(&engine->timeline->lock, flags);
3244 intel_engine_init_global_seqno(engine,
3245 intel_engine_last_submit(engine));
3246 spin_unlock_irqrestore(&engine->timeline->lock, flags);
3249 set_bit(I915_WEDGED, &i915->gpu_error.flags);
3250 wake_up_all(&i915->gpu_error.reset_queue);
3253 bool i915_gem_unset_wedged(struct drm_i915_private *i915)
3255 struct i915_gem_timeline *tl;
3258 lockdep_assert_held(&i915->drm.struct_mutex);
3259 if (!test_bit(I915_WEDGED, &i915->gpu_error.flags))
3262 /* Before unwedging, make sure that all pending operations
3263 * are flushed and errored out - we may have requests waiting upon
3264 * third party fences. We marked all inflight requests as EIO, and
3265 * every execbuf since returned EIO, for consistency we want all
3266 * the currently pending requests to also be marked as EIO, which
3267 * is done inside our nop_submit_request - and so we must wait.
3269 * No more can be submitted until we reset the wedged bit.
3271 list_for_each_entry(tl, &i915->gt.timelines, link) {
3272 for (i = 0; i < ARRAY_SIZE(tl->engine); i++) {
3273 struct drm_i915_gem_request *rq;
3275 rq = i915_gem_active_peek(&tl->engine[i].last_request,
3276 &i915->drm.struct_mutex);
3280 /* We can't use our normal waiter as we want to
3281 * avoid recursively trying to handle the current
3282 * reset. The basic dma_fence_default_wait() installs
3283 * a callback for dma_fence_signal(), which is
3284 * triggered by our nop handler (indirectly, the
3285 * callback enables the signaler thread which is
3286 * woken by the nop_submit_request() advancing the seqno
3287 * and when the seqno passes the fence, the signaler
3288 * then signals the fence waking us up).
3290 if (dma_fence_default_wait(&rq->fence, true,
3291 MAX_SCHEDULE_TIMEOUT) < 0)
3296 /* Undo nop_submit_request. We prevent all new i915 requests from
3297 * being queued (by disallowing execbuf whilst wedged) so having
3298 * waited for all active requests above, we know the system is idle
3299 * and do not have to worry about a thread being inside
3300 * engine->submit_request() as we swap over. So unlike installing
3301 * the nop_submit_request on reset, we can do this from normal
3302 * context and do not require stop_machine().
3304 intel_engines_reset_default_submission(i915);
3305 i915_gem_contexts_lost(i915);
3307 smp_mb__before_atomic(); /* complete takeover before enabling execbuf */
3308 clear_bit(I915_WEDGED, &i915->gpu_error.flags);
3314 i915_gem_retire_work_handler(struct work_struct *work)
3316 struct drm_i915_private *dev_priv =
3317 container_of(work, typeof(*dev_priv), gt.retire_work.work);
3318 struct drm_device *dev = &dev_priv->drm;
3320 /* Come back later if the device is busy... */
3321 if (mutex_trylock(&dev->struct_mutex)) {
3322 i915_gem_retire_requests(dev_priv);
3323 mutex_unlock(&dev->struct_mutex);
3326 /* Keep the retire handler running until we are finally idle.
3327 * We do not need to do this test under locking as in the worst-case
3328 * we queue the retire worker once too often.
3330 if (READ_ONCE(dev_priv->gt.awake)) {
3331 i915_queue_hangcheck(dev_priv);
3332 queue_delayed_work(dev_priv->wq,
3333 &dev_priv->gt.retire_work,
3334 round_jiffies_up_relative(HZ));
3339 new_requests_since_last_retire(const struct drm_i915_private *i915)
3341 return (READ_ONCE(i915->gt.active_requests) ||
3342 work_pending(&i915->gt.idle_work.work));
3346 i915_gem_idle_work_handler(struct work_struct *work)
3348 struct drm_i915_private *dev_priv =
3349 container_of(work, typeof(*dev_priv), gt.idle_work.work);
3350 bool rearm_hangcheck;
3353 if (!READ_ONCE(dev_priv->gt.awake))
3357 * Wait for last execlists context complete, but bail out in case a
3358 * new request is submitted.
3360 end = ktime_add_ms(ktime_get(), I915_IDLE_ENGINES_TIMEOUT);
3362 if (new_requests_since_last_retire(dev_priv))
3365 if (intel_engines_are_idle(dev_priv))
3368 usleep_range(100, 500);
3369 } while (ktime_before(ktime_get(), end));
3372 cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
3374 if (!mutex_trylock(&dev_priv->drm.struct_mutex)) {
3375 /* Currently busy, come back later */
3376 mod_delayed_work(dev_priv->wq,
3377 &dev_priv->gt.idle_work,
3378 msecs_to_jiffies(50));
3383 * New request retired after this work handler started, extend active
3384 * period until next instance of the work.
3386 if (new_requests_since_last_retire(dev_priv))
3390 * Be paranoid and flush a concurrent interrupt to make sure
3391 * we don't reactivate any irq tasklets after parking.
3393 * FIXME: Note that even though we have waited for execlists to be idle,
3394 * there may still be an in-flight interrupt even though the CSB
3395 * is now empty. synchronize_irq() makes sure that a residual interrupt
3396 * is completed before we continue, but it doesn't prevent the HW from
3397 * raising a spurious interrupt later. To complete the shield we should
3398 * coordinate disabling the CS irq with flushing the interrupts.
3400 synchronize_irq(dev_priv->drm.irq);
3402 intel_engines_park(dev_priv);
3403 i915_gem_timelines_park(dev_priv);
3405 i915_pmu_gt_parked(dev_priv);
3407 GEM_BUG_ON(!dev_priv->gt.awake);
3408 dev_priv->gt.awake = false;
3409 rearm_hangcheck = false;
3411 if (INTEL_GEN(dev_priv) >= 6)
3412 gen6_rps_idle(dev_priv);
3414 intel_display_power_put(dev_priv, POWER_DOMAIN_GT_IRQ);
3416 intel_runtime_pm_put(dev_priv);
3418 mutex_unlock(&dev_priv->drm.struct_mutex);
3421 if (rearm_hangcheck) {
3422 GEM_BUG_ON(!dev_priv->gt.awake);
3423 i915_queue_hangcheck(dev_priv);
3427 void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
3429 struct drm_i915_private *i915 = to_i915(gem->dev);
3430 struct drm_i915_gem_object *obj = to_intel_bo(gem);
3431 struct drm_i915_file_private *fpriv = file->driver_priv;
3432 struct i915_lut_handle *lut, *ln;
3434 mutex_lock(&i915->drm.struct_mutex);
3436 list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
3437 struct i915_gem_context *ctx = lut->ctx;
3438 struct i915_vma *vma;
3440 GEM_BUG_ON(ctx->file_priv == ERR_PTR(-EBADF));
3441 if (ctx->file_priv != fpriv)
3444 vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
3445 GEM_BUG_ON(vma->obj != obj);
3447 /* We allow the process to have multiple handles to the same
3448 * vma, in the same fd namespace, by virtue of flink/open.
3450 GEM_BUG_ON(!vma->open_count);
3451 if (!--vma->open_count && !i915_vma_is_ggtt(vma))
3452 i915_vma_close(vma);
3454 list_del(&lut->obj_link);
3455 list_del(&lut->ctx_link);
3457 kmem_cache_free(i915->luts, lut);
3458 __i915_gem_object_release_unless_active(obj);
3461 mutex_unlock(&i915->drm.struct_mutex);
3464 static unsigned long to_wait_timeout(s64 timeout_ns)
3467 return MAX_SCHEDULE_TIMEOUT;
3469 if (timeout_ns == 0)
3472 return nsecs_to_jiffies_timeout(timeout_ns);
3476 * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT
3477 * @dev: drm device pointer
3478 * @data: ioctl data blob
3479 * @file: drm file pointer
3481 * Returns 0 if successful, else an error is returned with the remaining time in
3482 * the timeout parameter.
3483 * -ETIME: object is still busy after timeout
3484 * -ERESTARTSYS: signal interrupted the wait
3485 * -ENONENT: object doesn't exist
3486 * Also possible, but rare:
3487 * -EAGAIN: incomplete, restart syscall
3489 * -ENODEV: Internal IRQ fail
3490 * -E?: The add request failed
3492 * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any
3493 * non-zero timeout parameter the wait ioctl will wait for the given number of
3494 * nanoseconds on an object becoming unbusy. Since the wait itself does so
3495 * without holding struct_mutex the object may become re-busied before this
3496 * function completes. A similar but shorter * race condition exists in the busy
3500 i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
3502 struct drm_i915_gem_wait *args = data;
3503 struct drm_i915_gem_object *obj;
3507 if (args->flags != 0)
3510 obj = i915_gem_object_lookup(file, args->bo_handle);
3514 start = ktime_get();
3516 ret = i915_gem_object_wait(obj,
3517 I915_WAIT_INTERRUPTIBLE | I915_WAIT_ALL,
3518 to_wait_timeout(args->timeout_ns),
3519 to_rps_client(file));
3521 if (args->timeout_ns > 0) {
3522 args->timeout_ns -= ktime_to_ns(ktime_sub(ktime_get(), start));
3523 if (args->timeout_ns < 0)
3524 args->timeout_ns = 0;
3527 * Apparently ktime isn't accurate enough and occasionally has a
3528 * bit of mismatch in the jiffies<->nsecs<->ktime loop. So patch
3529 * things up to make the test happy. We allow up to 1 jiffy.
3531 * This is a regression from the timespec->ktime conversion.
3533 if (ret == -ETIME && !nsecs_to_jiffies(args->timeout_ns))
3534 args->timeout_ns = 0;
3536 /* Asked to wait beyond the jiffie/scheduler precision? */
3537 if (ret == -ETIME && args->timeout_ns)
3541 i915_gem_object_put(obj);
3545 static int wait_for_timeline(struct i915_gem_timeline *tl, unsigned int flags)
3549 for (i = 0; i < ARRAY_SIZE(tl->engine); i++) {
3550 ret = i915_gem_active_wait(&tl->engine[i].last_request, flags);
3558 static int wait_for_engines(struct drm_i915_private *i915)
3560 if (wait_for(intel_engines_are_idle(i915), I915_IDLE_ENGINES_TIMEOUT)) {
3561 dev_err(i915->drm.dev,
3562 "Failed to idle engines, declaring wedged!\n");
3563 if (drm_debug & DRM_UT_DRIVER) {
3564 struct drm_printer p = drm_debug_printer(__func__);
3565 struct intel_engine_cs *engine;
3566 enum intel_engine_id id;
3568 for_each_engine(engine, i915, id)
3569 intel_engine_dump(engine, &p,
3570 "%s", engine->name);
3573 i915_gem_set_wedged(i915);
3580 int i915_gem_wait_for_idle(struct drm_i915_private *i915, unsigned int flags)
3584 /* If the device is asleep, we have no requests outstanding */
3585 if (!READ_ONCE(i915->gt.awake))
3588 if (flags & I915_WAIT_LOCKED) {
3589 struct i915_gem_timeline *tl;
3591 lockdep_assert_held(&i915->drm.struct_mutex);
3593 list_for_each_entry(tl, &i915->gt.timelines, link) {
3594 ret = wait_for_timeline(tl, flags);
3598 i915_gem_retire_requests(i915);
3600 ret = wait_for_engines(i915);
3602 ret = wait_for_timeline(&i915->gt.global_timeline, flags);
3608 static void __i915_gem_object_flush_for_display(struct drm_i915_gem_object *obj)
3611 * We manually flush the CPU domain so that we can override and
3612 * force the flush for the display, and perform it asyncrhonously.
3614 flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
3615 if (obj->cache_dirty)
3616 i915_gem_clflush_object(obj, I915_CLFLUSH_FORCE);
3617 obj->base.write_domain = 0;
3620 void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj)
3622 if (!READ_ONCE(obj->pin_global))
3625 mutex_lock(&obj->base.dev->struct_mutex);
3626 __i915_gem_object_flush_for_display(obj);
3627 mutex_unlock(&obj->base.dev->struct_mutex);
3631 * Moves a single object to the WC read, and possibly write domain.
3632 * @obj: object to act on
3633 * @write: ask for write access or read only
3635 * This function returns when the move is complete, including waiting on
3639 i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write)
3643 lockdep_assert_held(&obj->base.dev->struct_mutex);
3645 ret = i915_gem_object_wait(obj,
3646 I915_WAIT_INTERRUPTIBLE |
3648 (write ? I915_WAIT_ALL : 0),
3649 MAX_SCHEDULE_TIMEOUT,
3654 if (obj->base.write_domain == I915_GEM_DOMAIN_WC)
3657 /* Flush and acquire obj->pages so that we are coherent through
3658 * direct access in memory with previous cached writes through
3659 * shmemfs and that our cache domain tracking remains valid.
3660 * For example, if the obj->filp was moved to swap without us
3661 * being notified and releasing the pages, we would mistakenly
3662 * continue to assume that the obj remained out of the CPU cached
3665 ret = i915_gem_object_pin_pages(obj);
3669 flush_write_domain(obj, ~I915_GEM_DOMAIN_WC);
3671 /* Serialise direct access to this object with the barriers for
3672 * coherent writes from the GPU, by effectively invalidating the
3673 * WC domain upon first access.
3675 if ((obj->base.read_domains & I915_GEM_DOMAIN_WC) == 0)
3678 /* It should now be out of any other write domains, and we can update
3679 * the domain values for our changes.
3681 GEM_BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_WC) != 0);
3682 obj->base.read_domains |= I915_GEM_DOMAIN_WC;
3684 obj->base.read_domains = I915_GEM_DOMAIN_WC;
3685 obj->base.write_domain = I915_GEM_DOMAIN_WC;
3686 obj->mm.dirty = true;
3689 i915_gem_object_unpin_pages(obj);
3694 * Moves a single object to the GTT read, and possibly write domain.
3695 * @obj: object to act on
3696 * @write: ask for write access or read only
3698 * This function returns when the move is complete, including waiting on
3702 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
3706 lockdep_assert_held(&obj->base.dev->struct_mutex);
3708 ret = i915_gem_object_wait(obj,
3709 I915_WAIT_INTERRUPTIBLE |
3711 (write ? I915_WAIT_ALL : 0),
3712 MAX_SCHEDULE_TIMEOUT,
3717 if (obj->base.write_domain == I915_GEM_DOMAIN_GTT)
3720 /* Flush and acquire obj->pages so that we are coherent through
3721 * direct access in memory with previous cached writes through
3722 * shmemfs and that our cache domain tracking remains valid.
3723 * For example, if the obj->filp was moved to swap without us
3724 * being notified and releasing the pages, we would mistakenly
3725 * continue to assume that the obj remained out of the CPU cached
3728 ret = i915_gem_object_pin_pages(obj);
3732 flush_write_domain(obj, ~I915_GEM_DOMAIN_GTT);
3734 /* Serialise direct access to this object with the barriers for
3735 * coherent writes from the GPU, by effectively invalidating the
3736 * GTT domain upon first access.
3738 if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
3741 /* It should now be out of any other write domains, and we can update
3742 * the domain values for our changes.
3744 GEM_BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
3745 obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3747 obj->base.read_domains = I915_GEM_DOMAIN_GTT;
3748 obj->base.write_domain = I915_GEM_DOMAIN_GTT;
3749 obj->mm.dirty = true;
3752 i915_gem_object_unpin_pages(obj);
3757 * Changes the cache-level of an object across all VMA.
3758 * @obj: object to act on
3759 * @cache_level: new cache level to set for the object
3761 * After this function returns, the object will be in the new cache-level
3762 * across all GTT and the contents of the backing storage will be coherent,
3763 * with respect to the new cache-level. In order to keep the backing storage
3764 * coherent for all users, we only allow a single cache level to be set
3765 * globally on the object and prevent it from being changed whilst the
3766 * hardware is reading from the object. That is if the object is currently
3767 * on the scanout it will be set to uncached (or equivalent display
3768 * cache coherency) and all non-MOCS GPU access will also be uncached so
3769 * that all direct access to the scanout remains coherent.
3771 int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
3772 enum i915_cache_level cache_level)
3774 struct i915_vma *vma;
3777 lockdep_assert_held(&obj->base.dev->struct_mutex);
3779 if (obj->cache_level == cache_level)
3782 /* Inspect the list of currently bound VMA and unbind any that would
3783 * be invalid given the new cache-level. This is principally to
3784 * catch the issue of the CS prefetch crossing page boundaries and
3785 * reading an invalid PTE on older architectures.
3788 list_for_each_entry(vma, &obj->vma_list, obj_link) {
3789 if (!drm_mm_node_allocated(&vma->node))
3792 if (i915_vma_is_pinned(vma)) {
3793 DRM_DEBUG("can not change the cache level of pinned objects\n");
3797 if (!i915_vma_is_closed(vma) &&
3798 i915_gem_valid_gtt_space(vma, cache_level))
3801 ret = i915_vma_unbind(vma);
3805 /* As unbinding may affect other elements in the
3806 * obj->vma_list (due to side-effects from retiring
3807 * an active vma), play safe and restart the iterator.
3812 /* We can reuse the existing drm_mm nodes but need to change the
3813 * cache-level on the PTE. We could simply unbind them all and
3814 * rebind with the correct cache-level on next use. However since
3815 * we already have a valid slot, dma mapping, pages etc, we may as
3816 * rewrite the PTE in the belief that doing so tramples upon less
3817 * state and so involves less work.
3819 if (obj->bind_count) {
3820 /* Before we change the PTE, the GPU must not be accessing it.
3821 * If we wait upon the object, we know that all the bound
3822 * VMA are no longer active.
3824 ret = i915_gem_object_wait(obj,
3825 I915_WAIT_INTERRUPTIBLE |
3828 MAX_SCHEDULE_TIMEOUT,
3833 if (!HAS_LLC(to_i915(obj->base.dev)) &&
3834 cache_level != I915_CACHE_NONE) {
3835 /* Access to snoopable pages through the GTT is
3836 * incoherent and on some machines causes a hard
3837 * lockup. Relinquish the CPU mmaping to force
3838 * userspace to refault in the pages and we can
3839 * then double check if the GTT mapping is still
3840 * valid for that pointer access.
3842 i915_gem_release_mmap(obj);
3844 /* As we no longer need a fence for GTT access,
3845 * we can relinquish it now (and so prevent having
3846 * to steal a fence from someone else on the next
3847 * fence request). Note GPU activity would have
3848 * dropped the fence as all snoopable access is
3849 * supposed to be linear.
3851 for_each_ggtt_vma(vma, obj) {
3852 ret = i915_vma_put_fence(vma);
3857 /* We either have incoherent backing store and
3858 * so no GTT access or the architecture is fully
3859 * coherent. In such cases, existing GTT mmaps
3860 * ignore the cache bit in the PTE and we can
3861 * rewrite it without confusing the GPU or having
3862 * to force userspace to fault back in its mmaps.
3866 list_for_each_entry(vma, &obj->vma_list, obj_link) {
3867 if (!drm_mm_node_allocated(&vma->node))
3870 ret = i915_vma_bind(vma, cache_level, PIN_UPDATE);
3876 list_for_each_entry(vma, &obj->vma_list, obj_link)
3877 vma->node.color = cache_level;
3878 i915_gem_object_set_cache_coherency(obj, cache_level);
3879 obj->cache_dirty = true; /* Always invalidate stale cachelines */
3884 int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
3885 struct drm_file *file)
3887 struct drm_i915_gem_caching *args = data;
3888 struct drm_i915_gem_object *obj;
3892 obj = i915_gem_object_lookup_rcu(file, args->handle);
3898 switch (obj->cache_level) {
3899 case I915_CACHE_LLC:
3900 case I915_CACHE_L3_LLC:
3901 args->caching = I915_CACHING_CACHED;
3905 args->caching = I915_CACHING_DISPLAY;
3909 args->caching = I915_CACHING_NONE;
3917 int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
3918 struct drm_file *file)
3920 struct drm_i915_private *i915 = to_i915(dev);
3921 struct drm_i915_gem_caching *args = data;
3922 struct drm_i915_gem_object *obj;
3923 enum i915_cache_level level;
3926 switch (args->caching) {
3927 case I915_CACHING_NONE:
3928 level = I915_CACHE_NONE;
3930 case I915_CACHING_CACHED:
3932 * Due to a HW issue on BXT A stepping, GPU stores via a
3933 * snooped mapping may leave stale data in a corresponding CPU
3934 * cacheline, whereas normally such cachelines would get
3937 if (!HAS_LLC(i915) && !HAS_SNOOP(i915))
3940 level = I915_CACHE_LLC;
3942 case I915_CACHING_DISPLAY:
3943 level = HAS_WT(i915) ? I915_CACHE_WT : I915_CACHE_NONE;
3949 obj = i915_gem_object_lookup(file, args->handle);
3954 * The caching mode of proxy object is handled by its generator, and
3955 * not allowed to be changed by userspace.
3957 if (i915_gem_object_is_proxy(obj)) {
3962 if (obj->cache_level == level)
3965 ret = i915_gem_object_wait(obj,
3966 I915_WAIT_INTERRUPTIBLE,
3967 MAX_SCHEDULE_TIMEOUT,
3968 to_rps_client(file));
3972 ret = i915_mutex_lock_interruptible(dev);
3976 ret = i915_gem_object_set_cache_level(obj, level);
3977 mutex_unlock(&dev->struct_mutex);
3980 i915_gem_object_put(obj);
3985 * Prepare buffer for display plane (scanout, cursors, etc).
3986 * Can be called from an uninterruptible phase (modesetting) and allows
3987 * any flushes to be pipelined (for pageflips).
3990 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
3992 const struct i915_ggtt_view *view)
3994 struct i915_vma *vma;
3997 lockdep_assert_held(&obj->base.dev->struct_mutex);
3999 /* Mark the global pin early so that we account for the
4000 * display coherency whilst setting up the cache domains.
4004 /* The display engine is not coherent with the LLC cache on gen6. As
4005 * a result, we make sure that the pinning that is about to occur is
4006 * done with uncached PTEs. This is lowest common denominator for all
4009 * However for gen6+, we could do better by using the GFDT bit instead
4010 * of uncaching, which would allow us to flush all the LLC-cached data
4011 * with that bit in the PTE to main memory with just one PIPE_CONTROL.
4013 ret = i915_gem_object_set_cache_level(obj,
4014 HAS_WT(to_i915(obj->base.dev)) ?
4015 I915_CACHE_WT : I915_CACHE_NONE);
4018 goto err_unpin_global;
4021 /* As the user may map the buffer once pinned in the display plane
4022 * (e.g. libkms for the bootup splash), we have to ensure that we
4023 * always use map_and_fenceable for all scanout buffers. However,
4024 * it may simply be too big to fit into mappable, in which case
4025 * put it anyway and hope that userspace can cope (but always first
4026 * try to preserve the existing ABI).
4028 vma = ERR_PTR(-ENOSPC);
4029 if (!view || view->type == I915_GGTT_VIEW_NORMAL)
4030 vma = i915_gem_object_ggtt_pin(obj, view, 0, alignment,
4031 PIN_MAPPABLE | PIN_NONBLOCK);
4033 struct drm_i915_private *i915 = to_i915(obj->base.dev);
4036 /* Valleyview is definitely limited to scanning out the first
4037 * 512MiB. Lets presume this behaviour was inherited from the
4038 * g4x display engine and that all earlier gen are similarly
4039 * limited. Testing suggests that it is a little more
4040 * complicated than this. For example, Cherryview appears quite
4041 * happy to scanout from anywhere within its global aperture.
4044 if (HAS_GMCH_DISPLAY(i915))
4045 flags = PIN_MAPPABLE;
4046 vma = i915_gem_object_ggtt_pin(obj, view, 0, alignment, flags);
4049 goto err_unpin_global;
4051 vma->display_alignment = max_t(u64, vma->display_alignment, alignment);
4053 /* Treat this as an end-of-frame, like intel_user_framebuffer_dirty() */
4054 __i915_gem_object_flush_for_display(obj);
4055 intel_fb_obj_flush(obj, ORIGIN_DIRTYFB);
4057 /* It should now be out of any other write domains, and we can update
4058 * the domain values for our changes.
4060 obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
4070 i915_gem_object_unpin_from_display_plane(struct i915_vma *vma)
4072 lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
4074 if (WARN_ON(vma->obj->pin_global == 0))
4077 if (--vma->obj->pin_global == 0)
4078 vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
4080 /* Bump the LRU to try and avoid premature eviction whilst flipping */
4081 i915_gem_object_bump_inactive_ggtt(vma->obj);
4083 i915_vma_unpin(vma);
4087 * Moves a single object to the CPU read, and possibly write domain.
4088 * @obj: object to act on
4089 * @write: requesting write or read-only access
4091 * This function returns when the move is complete, including waiting on
4095 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
4099 lockdep_assert_held(&obj->base.dev->struct_mutex);
4101 ret = i915_gem_object_wait(obj,
4102 I915_WAIT_INTERRUPTIBLE |
4104 (write ? I915_WAIT_ALL : 0),
4105 MAX_SCHEDULE_TIMEOUT,
4110 flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
4112 /* Flush the CPU cache if it's still invalid. */
4113 if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) {
4114 i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
4115 obj->base.read_domains |= I915_GEM_DOMAIN_CPU;
4118 /* It should now be out of any other write domains, and we can update
4119 * the domain values for our changes.
4121 GEM_BUG_ON(obj->base.write_domain & ~I915_GEM_DOMAIN_CPU);
4123 /* If we're writing through the CPU, then the GPU read domains will
4124 * need to be invalidated at next use.
4127 __start_cpu_write(obj);
4132 /* Throttle our rendering by waiting until the ring has completed our requests
4133 * emitted over 20 msec ago.
4135 * Note that if we were to use the current jiffies each time around the loop,
4136 * we wouldn't escape the function with any frames outstanding if the time to
4137 * render a frame was over 20ms.
4139 * This should get us reasonable parallelism between CPU and GPU but also
4140 * relatively low latency when blocking on a particular request to finish.
4143 i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
4145 struct drm_i915_private *dev_priv = to_i915(dev);
4146 struct drm_i915_file_private *file_priv = file->driver_priv;
4147 unsigned long recent_enough = jiffies - DRM_I915_THROTTLE_JIFFIES;
4148 struct drm_i915_gem_request *request, *target = NULL;
4151 /* ABI: return -EIO if already wedged */
4152 if (i915_terminally_wedged(&dev_priv->gpu_error))
4155 spin_lock(&file_priv->mm.lock);
4156 list_for_each_entry(request, &file_priv->mm.request_list, client_link) {
4157 if (time_after_eq(request->emitted_jiffies, recent_enough))
4161 list_del(&target->client_link);
4162 target->file_priv = NULL;
4168 i915_gem_request_get(target);
4169 spin_unlock(&file_priv->mm.lock);
4174 ret = i915_wait_request(target,
4175 I915_WAIT_INTERRUPTIBLE,
4176 MAX_SCHEDULE_TIMEOUT);
4177 i915_gem_request_put(target);
4179 return ret < 0 ? ret : 0;
4183 i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
4184 const struct i915_ggtt_view *view,
4189 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
4190 struct i915_address_space *vm = &dev_priv->ggtt.base;
4191 struct i915_vma *vma;
4194 lockdep_assert_held(&obj->base.dev->struct_mutex);
4196 if (!view && flags & PIN_MAPPABLE) {
4197 /* If the required space is larger than the available
4198 * aperture, we will not able to find a slot for the
4199 * object and unbinding the object now will be in
4200 * vain. Worse, doing so may cause us to ping-pong
4201 * the object in and out of the Global GTT and
4202 * waste a lot of cycles under the mutex.
4204 if (obj->base.size > dev_priv->ggtt.mappable_end)
4205 return ERR_PTR(-E2BIG);
4207 /* If NONBLOCK is set the caller is optimistically
4208 * trying to cache the full object within the mappable
4209 * aperture, and *must* have a fallback in place for
4210 * situations where we cannot bind the object. We
4211 * can be a little more lax here and use the fallback
4212 * more often to avoid costly migrations of ourselves
4213 * and other objects within the aperture.
4215 * Half-the-aperture is used as a simple heuristic.
4216 * More interesting would to do search for a free
4217 * block prior to making the commitment to unbind.
4218 * That caters for the self-harm case, and with a
4219 * little more heuristics (e.g. NOFAULT, NOEVICT)
4220 * we could try to minimise harm to others.
4222 if (flags & PIN_NONBLOCK &&
4223 obj->base.size > dev_priv->ggtt.mappable_end / 2)
4224 return ERR_PTR(-ENOSPC);
4227 vma = i915_vma_instance(obj, vm, view);
4228 if (unlikely(IS_ERR(vma)))
4231 if (i915_vma_misplaced(vma, size, alignment, flags)) {
4232 if (flags & PIN_NONBLOCK) {
4233 if (i915_vma_is_pinned(vma) || i915_vma_is_active(vma))
4234 return ERR_PTR(-ENOSPC);
4236 if (flags & PIN_MAPPABLE &&
4237 vma->fence_size > dev_priv->ggtt.mappable_end / 2)
4238 return ERR_PTR(-ENOSPC);
4241 WARN(i915_vma_is_pinned(vma),
4242 "bo is already pinned in ggtt with incorrect alignment:"
4243 " offset=%08x, req.alignment=%llx,"
4244 " req.map_and_fenceable=%d, vma->map_and_fenceable=%d\n",
4245 i915_ggtt_offset(vma), alignment,
4246 !!(flags & PIN_MAPPABLE),
4247 i915_vma_is_map_and_fenceable(vma));
4248 ret = i915_vma_unbind(vma);
4250 return ERR_PTR(ret);
4253 ret = i915_vma_pin(vma, size, alignment, flags | PIN_GLOBAL);
4255 return ERR_PTR(ret);
4260 static __always_inline unsigned int __busy_read_flag(unsigned int id)
4262 /* Note that we could alias engines in the execbuf API, but
4263 * that would be very unwise as it prevents userspace from
4264 * fine control over engine selection. Ahem.
4266 * This should be something like EXEC_MAX_ENGINE instead of
4269 BUILD_BUG_ON(I915_NUM_ENGINES > 16);
4270 return 0x10000 << id;
4273 static __always_inline unsigned int __busy_write_id(unsigned int id)
4275 /* The uABI guarantees an active writer is also amongst the read
4276 * engines. This would be true if we accessed the activity tracking
4277 * under the lock, but as we perform the lookup of the object and
4278 * its activity locklessly we can not guarantee that the last_write
4279 * being active implies that we have set the same engine flag from
4280 * last_read - hence we always set both read and write busy for
4283 return id | __busy_read_flag(id);
4286 static __always_inline unsigned int
4287 __busy_set_if_active(const struct dma_fence *fence,
4288 unsigned int (*flag)(unsigned int id))
4290 struct drm_i915_gem_request *rq;
4292 /* We have to check the current hw status of the fence as the uABI
4293 * guarantees forward progress. We could rely on the idle worker
4294 * to eventually flush us, but to minimise latency just ask the
4297 * Note we only report on the status of native fences.
4299 if (!dma_fence_is_i915(fence))
4302 /* opencode to_request() in order to avoid const warnings */
4303 rq = container_of(fence, struct drm_i915_gem_request, fence);
4304 if (i915_gem_request_completed(rq))
4307 return flag(rq->engine->uabi_id);
4310 static __always_inline unsigned int
4311 busy_check_reader(const struct dma_fence *fence)
4313 return __busy_set_if_active(fence, __busy_read_flag);
4316 static __always_inline unsigned int
4317 busy_check_writer(const struct dma_fence *fence)
4322 return __busy_set_if_active(fence, __busy_write_id);
4326 i915_gem_busy_ioctl(struct drm_device *dev, void *data,
4327 struct drm_file *file)
4329 struct drm_i915_gem_busy *args = data;
4330 struct drm_i915_gem_object *obj;
4331 struct reservation_object_list *list;
4337 obj = i915_gem_object_lookup_rcu(file, args->handle);
4341 /* A discrepancy here is that we do not report the status of
4342 * non-i915 fences, i.e. even though we may report the object as idle,
4343 * a call to set-domain may still stall waiting for foreign rendering.
4344 * This also means that wait-ioctl may report an object as busy,
4345 * where busy-ioctl considers it idle.
4347 * We trade the ability to warn of foreign fences to report on which
4348 * i915 engines are active for the object.
4350 * Alternatively, we can trade that extra information on read/write
4353 * !reservation_object_test_signaled_rcu(obj->resv, true);
4354 * to report the overall busyness. This is what the wait-ioctl does.
4358 seq = raw_read_seqcount(&obj->resv->seq);
4360 /* Translate the exclusive fence to the READ *and* WRITE engine */
4361 args->busy = busy_check_writer(rcu_dereference(obj->resv->fence_excl));
4363 /* Translate shared fences to READ set of engines */
4364 list = rcu_dereference(obj->resv->fence);
4366 unsigned int shared_count = list->shared_count, i;
4368 for (i = 0; i < shared_count; ++i) {
4369 struct dma_fence *fence =
4370 rcu_dereference(list->shared[i]);
4372 args->busy |= busy_check_reader(fence);
4376 if (args->busy && read_seqcount_retry(&obj->resv->seq, seq))
4386 i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
4387 struct drm_file *file_priv)
4389 return i915_gem_ring_throttle(dev, file_priv);
4393 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
4394 struct drm_file *file_priv)
4396 struct drm_i915_private *dev_priv = to_i915(dev);
4397 struct drm_i915_gem_madvise *args = data;
4398 struct drm_i915_gem_object *obj;
4401 switch (args->madv) {
4402 case I915_MADV_DONTNEED:
4403 case I915_MADV_WILLNEED:
4409 obj = i915_gem_object_lookup(file_priv, args->handle);
4413 err = mutex_lock_interruptible(&obj->mm.lock);
4417 if (i915_gem_object_has_pages(obj) &&
4418 i915_gem_object_is_tiled(obj) &&
4419 dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
4420 if (obj->mm.madv == I915_MADV_WILLNEED) {
4421 GEM_BUG_ON(!obj->mm.quirked);
4422 __i915_gem_object_unpin_pages(obj);
4423 obj->mm.quirked = false;
4425 if (args->madv == I915_MADV_WILLNEED) {
4426 GEM_BUG_ON(obj->mm.quirked);
4427 __i915_gem_object_pin_pages(obj);
4428 obj->mm.quirked = true;
4432 if (obj->mm.madv != __I915_MADV_PURGED)
4433 obj->mm.madv = args->madv;
4435 /* if the object is no longer attached, discard its backing storage */
4436 if (obj->mm.madv == I915_MADV_DONTNEED &&
4437 !i915_gem_object_has_pages(obj))
4438 i915_gem_object_truncate(obj);
4440 args->retained = obj->mm.madv != __I915_MADV_PURGED;
4441 mutex_unlock(&obj->mm.lock);
4444 i915_gem_object_put(obj);
4449 frontbuffer_retire(struct i915_gem_active *active,
4450 struct drm_i915_gem_request *request)
4452 struct drm_i915_gem_object *obj =
4453 container_of(active, typeof(*obj), frontbuffer_write);
4455 intel_fb_obj_flush(obj, ORIGIN_CS);
4458 void i915_gem_object_init(struct drm_i915_gem_object *obj,
4459 const struct drm_i915_gem_object_ops *ops)
4461 mutex_init(&obj->mm.lock);
4463 INIT_LIST_HEAD(&obj->vma_list);
4464 INIT_LIST_HEAD(&obj->lut_list);
4465 INIT_LIST_HEAD(&obj->batch_pool_link);
4469 reservation_object_init(&obj->__builtin_resv);
4470 obj->resv = &obj->__builtin_resv;
4472 obj->frontbuffer_ggtt_origin = ORIGIN_GTT;
4473 init_request_active(&obj->frontbuffer_write, frontbuffer_retire);
4475 obj->mm.madv = I915_MADV_WILLNEED;
4476 INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
4477 mutex_init(&obj->mm.get_page.lock);
4479 i915_gem_info_add_obj(to_i915(obj->base.dev), obj->base.size);
4482 static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
4483 .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
4484 I915_GEM_OBJECT_IS_SHRINKABLE,
4486 .get_pages = i915_gem_object_get_pages_gtt,
4487 .put_pages = i915_gem_object_put_pages_gtt,
4489 .pwrite = i915_gem_object_pwrite_gtt,
4492 static int i915_gem_object_create_shmem(struct drm_device *dev,
4493 struct drm_gem_object *obj,
4496 struct drm_i915_private *i915 = to_i915(dev);
4497 unsigned long flags = VM_NORESERVE;
4500 drm_gem_private_object_init(dev, obj, size);
4503 filp = shmem_file_setup_with_mnt(i915->mm.gemfs, "i915", size,
4506 filp = shmem_file_setup("i915", size, flags);
4509 return PTR_ERR(filp);
4516 struct drm_i915_gem_object *
4517 i915_gem_object_create(struct drm_i915_private *dev_priv, u64 size)
4519 struct drm_i915_gem_object *obj;
4520 struct address_space *mapping;
4521 unsigned int cache_level;
4525 /* There is a prevalence of the assumption that we fit the object's
4526 * page count inside a 32bit _signed_ variable. Let's document this and
4527 * catch if we ever need to fix it. In the meantime, if you do spot
4528 * such a local variable, please consider fixing!
4530 if (size >> PAGE_SHIFT > INT_MAX)
4531 return ERR_PTR(-E2BIG);
4533 if (overflows_type(size, obj->base.size))
4534 return ERR_PTR(-E2BIG);
4536 obj = i915_gem_object_alloc(dev_priv);
4538 return ERR_PTR(-ENOMEM);
4540 ret = i915_gem_object_create_shmem(&dev_priv->drm, &obj->base, size);
4544 mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
4545 if (IS_I965GM(dev_priv) || IS_I965G(dev_priv)) {
4546 /* 965gm cannot relocate objects above 4GiB. */
4547 mask &= ~__GFP_HIGHMEM;
4548 mask |= __GFP_DMA32;
4551 mapping = obj->base.filp->f_mapping;
4552 mapping_set_gfp_mask(mapping, mask);
4553 GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));
4555 i915_gem_object_init(obj, &i915_gem_object_ops);
4557 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4558 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4560 if (HAS_LLC(dev_priv))
4561 /* On some devices, we can have the GPU use the LLC (the CPU
4562 * cache) for about a 10% performance improvement
4563 * compared to uncached. Graphics requests other than
4564 * display scanout are coherent with the CPU in
4565 * accessing this cache. This means in this mode we
4566 * don't need to clflush on the CPU side, and on the
4567 * GPU side we only need to flush internal caches to
4568 * get data visible to the CPU.
4570 * However, we maintain the display planes as UC, and so
4571 * need to rebind when first used as such.
4573 cache_level = I915_CACHE_LLC;
4575 cache_level = I915_CACHE_NONE;
4577 i915_gem_object_set_cache_coherency(obj, cache_level);
4579 trace_i915_gem_object_create(obj);
4584 i915_gem_object_free(obj);
4585 return ERR_PTR(ret);
4588 static bool discard_backing_storage(struct drm_i915_gem_object *obj)
4590 /* If we are the last user of the backing storage (be it shmemfs
4591 * pages or stolen etc), we know that the pages are going to be
4592 * immediately released. In this case, we can then skip copying
4593 * back the contents from the GPU.
4596 if (obj->mm.madv != I915_MADV_WILLNEED)
4599 if (obj->base.filp == NULL)
4602 /* At first glance, this looks racy, but then again so would be
4603 * userspace racing mmap against close. However, the first external
4604 * reference to the filp can only be obtained through the
4605 * i915_gem_mmap_ioctl() which safeguards us against the user
4606 * acquiring such a reference whilst we are in the middle of
4607 * freeing the object.
4609 return atomic_long_read(&obj->base.filp->f_count) == 1;
4612 static void __i915_gem_free_objects(struct drm_i915_private *i915,
4613 struct llist_node *freed)
4615 struct drm_i915_gem_object *obj, *on;
4617 intel_runtime_pm_get(i915);
4618 llist_for_each_entry_safe(obj, on, freed, freed) {
4619 struct i915_vma *vma, *vn;
4621 trace_i915_gem_object_destroy(obj);
4623 mutex_lock(&i915->drm.struct_mutex);
4625 GEM_BUG_ON(i915_gem_object_is_active(obj));
4626 list_for_each_entry_safe(vma, vn,
4627 &obj->vma_list, obj_link) {
4628 GEM_BUG_ON(i915_vma_is_active(vma));
4629 vma->flags &= ~I915_VMA_PIN_MASK;
4630 i915_vma_close(vma);
4632 GEM_BUG_ON(!list_empty(&obj->vma_list));
4633 GEM_BUG_ON(!RB_EMPTY_ROOT(&obj->vma_tree));
4635 /* This serializes freeing with the shrinker. Since the free
4636 * is delayed, first by RCU then by the workqueue, we want the
4637 * shrinker to be able to free pages of unreferenced objects,
4638 * or else we may oom whilst there are plenty of deferred
4641 if (i915_gem_object_has_pages(obj)) {
4642 spin_lock(&i915->mm.obj_lock);
4643 list_del_init(&obj->mm.link);
4644 spin_unlock(&i915->mm.obj_lock);
4647 mutex_unlock(&i915->drm.struct_mutex);
4649 GEM_BUG_ON(obj->bind_count);
4650 GEM_BUG_ON(obj->userfault_count);
4651 GEM_BUG_ON(atomic_read(&obj->frontbuffer_bits));
4652 GEM_BUG_ON(!list_empty(&obj->lut_list));
4654 if (obj->ops->release)
4655 obj->ops->release(obj);
4657 if (WARN_ON(i915_gem_object_has_pinned_pages(obj)))
4658 atomic_set(&obj->mm.pages_pin_count, 0);
4659 __i915_gem_object_put_pages(obj, I915_MM_NORMAL);
4660 GEM_BUG_ON(i915_gem_object_has_pages(obj));
4662 if (obj->base.import_attach)
4663 drm_prime_gem_destroy(&obj->base, NULL);
4665 reservation_object_fini(&obj->__builtin_resv);
4666 drm_gem_object_release(&obj->base);
4667 i915_gem_info_remove_obj(i915, obj->base.size);
4670 i915_gem_object_free(obj);
4675 intel_runtime_pm_put(i915);
4678 static void i915_gem_flush_free_objects(struct drm_i915_private *i915)
4680 struct llist_node *freed;
4682 /* Free the oldest, most stale object to keep the free_list short */
4684 if (!llist_empty(&i915->mm.free_list)) { /* quick test for hotpath */
4685 /* Only one consumer of llist_del_first() allowed */
4686 spin_lock(&i915->mm.free_lock);
4687 freed = llist_del_first(&i915->mm.free_list);
4688 spin_unlock(&i915->mm.free_lock);
4690 if (unlikely(freed)) {
4692 __i915_gem_free_objects(i915, freed);
4696 static void __i915_gem_free_work(struct work_struct *work)
4698 struct drm_i915_private *i915 =
4699 container_of(work, struct drm_i915_private, mm.free_work);
4700 struct llist_node *freed;
4702 /* All file-owned VMA should have been released by this point through
4703 * i915_gem_close_object(), or earlier by i915_gem_context_close().
4704 * However, the object may also be bound into the global GTT (e.g.
4705 * older GPUs without per-process support, or for direct access through
4706 * the GTT either for the user or for scanout). Those VMA still need to
4710 spin_lock(&i915->mm.free_lock);
4711 while ((freed = llist_del_all(&i915->mm.free_list))) {
4712 spin_unlock(&i915->mm.free_lock);
4714 __i915_gem_free_objects(i915, freed);
4718 spin_lock(&i915->mm.free_lock);
4720 spin_unlock(&i915->mm.free_lock);
4723 static void __i915_gem_free_object_rcu(struct rcu_head *head)
4725 struct drm_i915_gem_object *obj =
4726 container_of(head, typeof(*obj), rcu);
4727 struct drm_i915_private *i915 = to_i915(obj->base.dev);
4729 /* We can't simply use call_rcu() from i915_gem_free_object()
4730 * as we need to block whilst unbinding, and the call_rcu
4731 * task may be called from softirq context. So we take a
4732 * detour through a worker.
4734 if (llist_add(&obj->freed, &i915->mm.free_list))
4735 schedule_work(&i915->mm.free_work);
4738 void i915_gem_free_object(struct drm_gem_object *gem_obj)
4740 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
4742 if (obj->mm.quirked)
4743 __i915_gem_object_unpin_pages(obj);
4745 if (discard_backing_storage(obj))
4746 obj->mm.madv = I915_MADV_DONTNEED;
4748 /* Before we free the object, make sure any pure RCU-only
4749 * read-side critical sections are complete, e.g.
4750 * i915_gem_busy_ioctl(). For the corresponding synchronized
4751 * lookup see i915_gem_object_lookup_rcu().
4753 call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
4756 void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj)
4758 lockdep_assert_held(&obj->base.dev->struct_mutex);
4760 if (!i915_gem_object_has_active_reference(obj) &&
4761 i915_gem_object_is_active(obj))
4762 i915_gem_object_set_active_reference(obj);
4764 i915_gem_object_put(obj);
4767 static void assert_kernel_context_is_current(struct drm_i915_private *i915)
4769 struct i915_gem_context *kernel_context = i915->kernel_context;
4770 struct intel_engine_cs *engine;
4771 enum intel_engine_id id;
4773 for_each_engine(engine, i915, id) {
4774 GEM_BUG_ON(__i915_gem_active_peek(&engine->timeline->last_request));
4775 GEM_BUG_ON(engine->last_retired_context != kernel_context);
4779 void i915_gem_sanitize(struct drm_i915_private *i915)
4781 if (i915_terminally_wedged(&i915->gpu_error)) {
4782 mutex_lock(&i915->drm.struct_mutex);
4783 i915_gem_unset_wedged(i915);
4784 mutex_unlock(&i915->drm.struct_mutex);
4788 * If we inherit context state from the BIOS or earlier occupants
4789 * of the GPU, the GPU may be in an inconsistent state when we
4790 * try to take over. The only way to remove the earlier state
4791 * is by resetting. However, resetting on earlier gen is tricky as
4792 * it may impact the display and we are uncertain about the stability
4793 * of the reset, so this could be applied to even earlier gen.
4795 if (INTEL_GEN(i915) >= 5) {
4796 int reset = intel_gpu_reset(i915, ALL_ENGINES);
4797 WARN_ON(reset && reset != -ENODEV);
4801 int i915_gem_suspend(struct drm_i915_private *dev_priv)
4803 struct drm_device *dev = &dev_priv->drm;
4806 intel_runtime_pm_get(dev_priv);
4807 intel_suspend_gt_powersave(dev_priv);
4809 mutex_lock(&dev->struct_mutex);
4811 /* We have to flush all the executing contexts to main memory so
4812 * that they can saved in the hibernation image. To ensure the last
4813 * context image is coherent, we have to switch away from it. That
4814 * leaves the dev_priv->kernel_context still active when
4815 * we actually suspend, and its image in memory may not match the GPU
4816 * state. Fortunately, the kernel_context is disposable and we do
4817 * not rely on its state.
4819 if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
4820 ret = i915_gem_switch_to_kernel_context(dev_priv);
4824 ret = i915_gem_wait_for_idle(dev_priv,
4825 I915_WAIT_INTERRUPTIBLE |
4827 if (ret && ret != -EIO)
4830 assert_kernel_context_is_current(dev_priv);
4832 i915_gem_contexts_lost(dev_priv);
4833 mutex_unlock(&dev->struct_mutex);
4835 intel_guc_suspend(dev_priv);
4837 cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
4838 cancel_delayed_work_sync(&dev_priv->gt.retire_work);
4840 /* As the idle_work is rearming if it detects a race, play safe and
4841 * repeat the flush until it is definitely idle.
4843 drain_delayed_work(&dev_priv->gt.idle_work);
4845 /* Assert that we sucessfully flushed all the work and
4846 * reset the GPU back to its idle, low power state.
4848 WARN_ON(dev_priv->gt.awake);
4849 if (WARN_ON(!intel_engines_are_idle(dev_priv)))
4850 i915_gem_set_wedged(dev_priv); /* no hope, discard everything */
4853 * Neither the BIOS, ourselves or any other kernel
4854 * expects the system to be in execlists mode on startup,
4855 * so we need to reset the GPU back to legacy mode. And the only
4856 * known way to disable logical contexts is through a GPU reset.
4858 * So in order to leave the system in a known default configuration,
4859 * always reset the GPU upon unload and suspend. Afterwards we then
4860 * clean up the GEM state tracking, flushing off the requests and
4861 * leaving the system in a known idle state.
4863 * Note that is of the upmost importance that the GPU is idle and
4864 * all stray writes are flushed *before* we dismantle the backing
4865 * storage for the pinned objects.
4867 * However, since we are uncertain that resetting the GPU on older
4868 * machines is a good idea, we don't - just in case it leaves the
4869 * machine in an unusable condition.
4871 i915_gem_sanitize(dev_priv);
4873 intel_runtime_pm_put(dev_priv);
4877 mutex_unlock(&dev->struct_mutex);
4878 intel_runtime_pm_put(dev_priv);
4882 void i915_gem_resume(struct drm_i915_private *i915)
4884 WARN_ON(i915->gt.awake);
4886 mutex_lock(&i915->drm.struct_mutex);
4887 intel_uncore_forcewake_get(i915, FORCEWAKE_ALL);
4889 i915_gem_restore_gtt_mappings(i915);
4890 i915_gem_restore_fences(i915);
4893 * As we didn't flush the kernel context before suspend, we cannot
4894 * guarantee that the context image is complete. So let's just reset
4895 * it and start again.
4897 i915->gt.resume(i915);
4899 if (i915_gem_init_hw(i915))
4902 intel_guc_resume(i915);
4904 /* Always reload a context for powersaving. */
4905 if (i915_gem_switch_to_kernel_context(i915))
4909 intel_uncore_forcewake_put(i915, FORCEWAKE_ALL);
4910 mutex_unlock(&i915->drm.struct_mutex);
4914 if (!i915_terminally_wedged(&i915->gpu_error)) {
4915 DRM_ERROR("failed to re-initialize GPU, declaring wedged!\n");
4916 i915_gem_set_wedged(i915);
4921 void i915_gem_init_swizzling(struct drm_i915_private *dev_priv)
4923 if (INTEL_GEN(dev_priv) < 5 ||
4924 dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE)
4927 I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
4928 DISP_TILE_SURFACE_SWIZZLING);
4930 if (IS_GEN5(dev_priv))
4933 I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL);
4934 if (IS_GEN6(dev_priv))
4935 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
4936 else if (IS_GEN7(dev_priv))
4937 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
4938 else if (IS_GEN8(dev_priv))
4939 I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW));
4944 static void init_unused_ring(struct drm_i915_private *dev_priv, u32 base)
4946 I915_WRITE(RING_CTL(base), 0);
4947 I915_WRITE(RING_HEAD(base), 0);
4948 I915_WRITE(RING_TAIL(base), 0);
4949 I915_WRITE(RING_START(base), 0);
4952 static void init_unused_rings(struct drm_i915_private *dev_priv)
4954 if (IS_I830(dev_priv)) {
4955 init_unused_ring(dev_priv, PRB1_BASE);
4956 init_unused_ring(dev_priv, SRB0_BASE);
4957 init_unused_ring(dev_priv, SRB1_BASE);
4958 init_unused_ring(dev_priv, SRB2_BASE);
4959 init_unused_ring(dev_priv, SRB3_BASE);
4960 } else if (IS_GEN2(dev_priv)) {
4961 init_unused_ring(dev_priv, SRB0_BASE);
4962 init_unused_ring(dev_priv, SRB1_BASE);
4963 } else if (IS_GEN3(dev_priv)) {
4964 init_unused_ring(dev_priv, PRB1_BASE);
4965 init_unused_ring(dev_priv, PRB2_BASE);
4969 static int __i915_gem_restart_engines(void *data)
4971 struct drm_i915_private *i915 = data;
4972 struct intel_engine_cs *engine;
4973 enum intel_engine_id id;
4976 for_each_engine(engine, i915, id) {
4977 err = engine->init_hw(engine);
4985 int i915_gem_init_hw(struct drm_i915_private *dev_priv)
4989 dev_priv->gt.last_init_time = ktime_get();
4991 /* Double layer security blanket, see i915_gem_init() */
4992 intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
4994 if (HAS_EDRAM(dev_priv) && INTEL_GEN(dev_priv) < 9)
4995 I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf));
4997 if (IS_HASWELL(dev_priv))
4998 I915_WRITE(MI_PREDICATE_RESULT_2, IS_HSW_GT3(dev_priv) ?
4999 LOWER_SLICE_ENABLED : LOWER_SLICE_DISABLED);
5001 if (HAS_PCH_NOP(dev_priv)) {
5002 if (IS_IVYBRIDGE(dev_priv)) {
5003 u32 temp = I915_READ(GEN7_MSG_CTL);
5004 temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
5005 I915_WRITE(GEN7_MSG_CTL, temp);
5006 } else if (INTEL_GEN(dev_priv) >= 7) {
5007 u32 temp = I915_READ(HSW_NDE_RSTWRN_OPT);
5008 temp &= ~RESET_PCH_HANDSHAKE_ENABLE;
5009 I915_WRITE(HSW_NDE_RSTWRN_OPT, temp);
5013 i915_gem_init_swizzling(dev_priv);
5016 * At least 830 can leave some of the unused rings
5017 * "active" (ie. head != tail) after resume which
5018 * will prevent c3 entry. Makes sure all unused rings
5021 init_unused_rings(dev_priv);
5023 BUG_ON(!dev_priv->kernel_context);
5024 if (i915_terminally_wedged(&dev_priv->gpu_error)) {
5029 ret = i915_ppgtt_init_hw(dev_priv);
5031 DRM_ERROR("PPGTT enable HW failed %d\n", ret);
5035 /* We can't enable contexts until all firmware is loaded */
5036 ret = intel_uc_init_hw(dev_priv);
5040 intel_mocs_init_l3cc_table(dev_priv);
5042 /* Only when the HW is re-initialised, can we replay the requests */
5043 ret = __i915_gem_restart_engines(dev_priv);
5045 intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
5049 static int __intel_engines_record_defaults(struct drm_i915_private *i915)
5051 struct i915_gem_context *ctx;
5052 struct intel_engine_cs *engine;
5053 enum intel_engine_id id;
5057 * As we reset the gpu during very early sanitisation, the current
5058 * register state on the GPU should reflect its defaults values.
5059 * We load a context onto the hw (with restore-inhibit), then switch
5060 * over to a second context to save that default register state. We
5061 * can then prime every new context with that state so they all start
5062 * from the same default HW values.
5065 ctx = i915_gem_context_create_kernel(i915, 0);
5067 return PTR_ERR(ctx);
5069 for_each_engine(engine, i915, id) {
5070 struct drm_i915_gem_request *rq;
5072 rq = i915_gem_request_alloc(engine, ctx);
5079 if (engine->init_context)
5080 err = engine->init_context(rq);
5082 __i915_add_request(rq, true);
5087 err = i915_gem_switch_to_kernel_context(i915);
5091 err = i915_gem_wait_for_idle(i915, I915_WAIT_LOCKED);
5095 assert_kernel_context_is_current(i915);
5097 for_each_engine(engine, i915, id) {
5098 struct i915_vma *state;
5100 state = ctx->engine[id].state;
5105 * As we will hold a reference to the logical state, it will
5106 * not be torn down with the context, and importantly the
5107 * object will hold onto its vma (making it possible for a
5108 * stray GTT write to corrupt our defaults). Unmap the vma
5109 * from the GTT to prevent such accidents and reclaim the
5112 err = i915_vma_unbind(state);
5116 err = i915_gem_object_set_to_cpu_domain(state->obj, false);
5120 engine->default_state = i915_gem_object_get(state->obj);
5123 if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {
5124 unsigned int found = intel_engines_has_context_isolation(i915);
5127 * Make sure that classes with multiple engine instances all
5128 * share the same basic configuration.
5130 for_each_engine(engine, i915, id) {
5131 unsigned int bit = BIT(engine->uabi_class);
5132 unsigned int expected = engine->default_state ? bit : 0;
5134 if ((found & bit) != expected) {
5135 DRM_ERROR("mismatching default context state for class %d on engine %s\n",
5136 engine->uabi_class, engine->name);
5142 i915_gem_context_set_closed(ctx);
5143 i915_gem_context_put(ctx);
5148 * If we have to abandon now, we expect the engines to be idle
5149 * and ready to be torn-down. First try to flush any remaining
5150 * request, ensure we are pointing at the kernel context and
5153 if (WARN_ON(i915_gem_switch_to_kernel_context(i915)))
5156 if (WARN_ON(i915_gem_wait_for_idle(i915, I915_WAIT_LOCKED)))
5159 i915_gem_contexts_lost(i915);
5163 int i915_gem_init(struct drm_i915_private *dev_priv)
5168 * We need to fallback to 4K pages since gvt gtt handling doesn't
5169 * support huge page entries - we will need to check either hypervisor
5170 * mm can support huge guest page or just do emulation in gvt.
5172 if (intel_vgpu_active(dev_priv))
5173 mkwrite_device_info(dev_priv)->page_sizes =
5174 I915_GTT_PAGE_SIZE_4K;
5176 dev_priv->mm.unordered_timeline = dma_fence_context_alloc(1);
5178 if (HAS_LOGICAL_RING_CONTEXTS(dev_priv)) {
5179 dev_priv->gt.resume = intel_lr_context_resume;
5180 dev_priv->gt.cleanup_engine = intel_logical_ring_cleanup;
5182 dev_priv->gt.resume = intel_legacy_submission_resume;
5183 dev_priv->gt.cleanup_engine = intel_engine_cleanup;
5186 ret = i915_gem_init_userptr(dev_priv);
5190 ret = intel_uc_init_wq(dev_priv);
5194 /* This is just a security blanket to placate dragons.
5195 * On some systems, we very sporadically observe that the first TLBs
5196 * used by the CS may be stale, despite us poking the TLB reset. If
5197 * we hold the forcewake during initialisation these problems
5198 * just magically go away.
5200 mutex_lock(&dev_priv->drm.struct_mutex);
5201 intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
5203 ret = i915_gem_init_ggtt(dev_priv);
5205 GEM_BUG_ON(ret == -EIO);
5209 ret = i915_gem_contexts_init(dev_priv);
5211 GEM_BUG_ON(ret == -EIO);
5215 ret = intel_engines_init(dev_priv);
5217 GEM_BUG_ON(ret == -EIO);
5221 intel_init_gt_powersave(dev_priv);
5223 ret = intel_uc_init(dev_priv);
5227 ret = i915_gem_init_hw(dev_priv);
5232 * Despite its name intel_init_clock_gating applies both display
5233 * clock gating workarounds; GT mmio workarounds and the occasional
5234 * GT power context workaround. Worse, sometimes it includes a context
5235 * register workaround which we need to apply before we record the
5236 * default HW state for all contexts.
5238 * FIXME: break up the workarounds and apply them at the right time!
5240 intel_init_clock_gating(dev_priv);
5242 ret = __intel_engines_record_defaults(dev_priv);
5246 if (i915_inject_load_failure()) {
5251 if (i915_inject_load_failure()) {
5256 intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
5257 mutex_unlock(&dev_priv->drm.struct_mutex);
5262 * Unwinding is complicated by that we want to handle -EIO to mean
5263 * disable GPU submission but keep KMS alive. We want to mark the
5264 * HW as irrevisibly wedged, but keep enough state around that the
5265 * driver doesn't explode during runtime.
5268 i915_gem_wait_for_idle(dev_priv, I915_WAIT_LOCKED);
5269 i915_gem_contexts_lost(dev_priv);
5270 intel_uc_fini_hw(dev_priv);
5272 intel_uc_fini(dev_priv);
5275 intel_cleanup_gt_powersave(dev_priv);
5276 i915_gem_cleanup_engines(dev_priv);
5280 i915_gem_contexts_fini(dev_priv);
5283 intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
5284 mutex_unlock(&dev_priv->drm.struct_mutex);
5287 i915_gem_cleanup_userptr(dev_priv);
5291 * Allow engine initialisation to fail by marking the GPU as
5292 * wedged. But we only want to do this where the GPU is angry,
5293 * for all other failure, such as an allocation failure, bail.
5295 if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
5296 DRM_ERROR("Failed to initialize GPU, declaring it wedged\n");
5297 i915_gem_set_wedged(dev_priv);
5302 i915_gem_drain_freed_objects(dev_priv);
5306 void i915_gem_init_mmio(struct drm_i915_private *i915)
5308 i915_gem_sanitize(i915);
5312 i915_gem_cleanup_engines(struct drm_i915_private *dev_priv)
5314 struct intel_engine_cs *engine;
5315 enum intel_engine_id id;
5317 for_each_engine(engine, dev_priv, id)
5318 dev_priv->gt.cleanup_engine(engine);
5322 i915_gem_load_init_fences(struct drm_i915_private *dev_priv)
5326 if (INTEL_INFO(dev_priv)->gen >= 7 && !IS_VALLEYVIEW(dev_priv) &&
5327 !IS_CHERRYVIEW(dev_priv))
5328 dev_priv->num_fence_regs = 32;
5329 else if (INTEL_INFO(dev_priv)->gen >= 4 ||
5330 IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
5331 IS_G33(dev_priv) || IS_PINEVIEW(dev_priv))
5332 dev_priv->num_fence_regs = 16;
5334 dev_priv->num_fence_regs = 8;
5336 if (intel_vgpu_active(dev_priv))
5337 dev_priv->num_fence_regs =
5338 I915_READ(vgtif_reg(avail_rs.fence_num));
5340 /* Initialize fence registers to zero */
5341 for (i = 0; i < dev_priv->num_fence_regs; i++) {
5342 struct drm_i915_fence_reg *fence = &dev_priv->fence_regs[i];
5344 fence->i915 = dev_priv;
5346 list_add_tail(&fence->link, &dev_priv->mm.fence_list);
5348 i915_gem_restore_fences(dev_priv);
5350 i915_gem_detect_bit_6_swizzle(dev_priv);
5353 static void i915_gem_init__mm(struct drm_i915_private *i915)
5355 spin_lock_init(&i915->mm.object_stat_lock);
5356 spin_lock_init(&i915->mm.obj_lock);
5357 spin_lock_init(&i915->mm.free_lock);
5359 init_llist_head(&i915->mm.free_list);
5361 INIT_LIST_HEAD(&i915->mm.unbound_list);
5362 INIT_LIST_HEAD(&i915->mm.bound_list);
5363 INIT_LIST_HEAD(&i915->mm.fence_list);
5364 INIT_LIST_HEAD(&i915->mm.userfault_list);
5366 INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
5370 i915_gem_load_init(struct drm_i915_private *dev_priv)
5374 dev_priv->objects = KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN);
5375 if (!dev_priv->objects)
5378 dev_priv->vmas = KMEM_CACHE(i915_vma, SLAB_HWCACHE_ALIGN);
5379 if (!dev_priv->vmas)
5382 dev_priv->luts = KMEM_CACHE(i915_lut_handle, 0);
5383 if (!dev_priv->luts)
5386 dev_priv->requests = KMEM_CACHE(drm_i915_gem_request,
5387 SLAB_HWCACHE_ALIGN |
5388 SLAB_RECLAIM_ACCOUNT |
5389 SLAB_TYPESAFE_BY_RCU);
5390 if (!dev_priv->requests)
5393 dev_priv->dependencies = KMEM_CACHE(i915_dependency,
5394 SLAB_HWCACHE_ALIGN |
5395 SLAB_RECLAIM_ACCOUNT);
5396 if (!dev_priv->dependencies)
5399 dev_priv->priorities = KMEM_CACHE(i915_priolist, SLAB_HWCACHE_ALIGN);
5400 if (!dev_priv->priorities)
5401 goto err_dependencies;
5403 mutex_lock(&dev_priv->drm.struct_mutex);
5404 INIT_LIST_HEAD(&dev_priv->gt.timelines);
5405 err = i915_gem_timeline_init__global(dev_priv);
5406 mutex_unlock(&dev_priv->drm.struct_mutex);
5408 goto err_priorities;
5410 i915_gem_init__mm(dev_priv);
5412 INIT_DELAYED_WORK(&dev_priv->gt.retire_work,
5413 i915_gem_retire_work_handler);
5414 INIT_DELAYED_WORK(&dev_priv->gt.idle_work,
5415 i915_gem_idle_work_handler);
5416 init_waitqueue_head(&dev_priv->gpu_error.wait_queue);
5417 init_waitqueue_head(&dev_priv->gpu_error.reset_queue);
5419 atomic_set(&dev_priv->mm.bsd_engine_dispatch_index, 0);
5421 spin_lock_init(&dev_priv->fb_tracking.lock);
5423 err = i915_gemfs_init(dev_priv);
5425 DRM_NOTE("Unable to create a private tmpfs mount, hugepage support will be disabled(%d).\n", err);
5430 kmem_cache_destroy(dev_priv->priorities);
5432 kmem_cache_destroy(dev_priv->dependencies);
5434 kmem_cache_destroy(dev_priv->requests);
5436 kmem_cache_destroy(dev_priv->luts);
5438 kmem_cache_destroy(dev_priv->vmas);
5440 kmem_cache_destroy(dev_priv->objects);
5445 void i915_gem_load_cleanup(struct drm_i915_private *dev_priv)
5447 i915_gem_drain_freed_objects(dev_priv);
5448 WARN_ON(!llist_empty(&dev_priv->mm.free_list));
5449 WARN_ON(dev_priv->mm.object_count);
5451 mutex_lock(&dev_priv->drm.struct_mutex);
5452 i915_gem_timeline_fini(&dev_priv->gt.global_timeline);
5453 WARN_ON(!list_empty(&dev_priv->gt.timelines));
5454 mutex_unlock(&dev_priv->drm.struct_mutex);
5456 kmem_cache_destroy(dev_priv->priorities);
5457 kmem_cache_destroy(dev_priv->dependencies);
5458 kmem_cache_destroy(dev_priv->requests);
5459 kmem_cache_destroy(dev_priv->luts);
5460 kmem_cache_destroy(dev_priv->vmas);
5461 kmem_cache_destroy(dev_priv->objects);
5463 /* And ensure that our DESTROY_BY_RCU slabs are truly destroyed */
5466 i915_gemfs_fini(dev_priv);
5469 int i915_gem_freeze(struct drm_i915_private *dev_priv)
5471 /* Discard all purgeable objects, let userspace recover those as
5472 * required after resuming.
5474 i915_gem_shrink_all(dev_priv);
5479 int i915_gem_freeze_late(struct drm_i915_private *dev_priv)
5481 struct drm_i915_gem_object *obj;
5482 struct list_head *phases[] = {
5483 &dev_priv->mm.unbound_list,
5484 &dev_priv->mm.bound_list,
5488 /* Called just before we write the hibernation image.
5490 * We need to update the domain tracking to reflect that the CPU
5491 * will be accessing all the pages to create and restore from the
5492 * hibernation, and so upon restoration those pages will be in the
5495 * To make sure the hibernation image contains the latest state,
5496 * we update that state just before writing out the image.
5498 * To try and reduce the hibernation image, we manually shrink
5499 * the objects as well, see i915_gem_freeze()
5502 i915_gem_shrink(dev_priv, -1UL, NULL, I915_SHRINK_UNBOUND);
5503 i915_gem_drain_freed_objects(dev_priv);
5505 spin_lock(&dev_priv->mm.obj_lock);
5506 for (p = phases; *p; p++) {
5507 list_for_each_entry(obj, *p, mm.link)
5508 __start_cpu_write(obj);
5510 spin_unlock(&dev_priv->mm.obj_lock);
5515 void i915_gem_release(struct drm_device *dev, struct drm_file *file)
5517 struct drm_i915_file_private *file_priv = file->driver_priv;
5518 struct drm_i915_gem_request *request;
5520 /* Clean up our request list when the client is going away, so that
5521 * later retire_requests won't dereference our soon-to-be-gone
5524 spin_lock(&file_priv->mm.lock);
5525 list_for_each_entry(request, &file_priv->mm.request_list, client_link)
5526 request->file_priv = NULL;
5527 spin_unlock(&file_priv->mm.lock);
5530 int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
5532 struct drm_i915_file_private *file_priv;
5537 file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
5541 file->driver_priv = file_priv;
5542 file_priv->dev_priv = i915;
5543 file_priv->file = file;
5545 spin_lock_init(&file_priv->mm.lock);
5546 INIT_LIST_HEAD(&file_priv->mm.request_list);
5548 file_priv->bsd_engine = -1;
5550 ret = i915_gem_context_open(i915, file);
5558 * i915_gem_track_fb - update frontbuffer tracking
5559 * @old: current GEM buffer for the frontbuffer slots
5560 * @new: new GEM buffer for the frontbuffer slots
5561 * @frontbuffer_bits: bitmask of frontbuffer slots
5563 * This updates the frontbuffer tracking bits @frontbuffer_bits by clearing them
5564 * from @old and setting them in @new. Both @old and @new can be NULL.
5566 void i915_gem_track_fb(struct drm_i915_gem_object *old,
5567 struct drm_i915_gem_object *new,
5568 unsigned frontbuffer_bits)
5570 /* Control of individual bits within the mask are guarded by
5571 * the owning plane->mutex, i.e. we can never see concurrent
5572 * manipulation of individual bits. But since the bitfield as a whole
5573 * is updated using RMW, we need to use atomics in order to update
5576 BUILD_BUG_ON(INTEL_FRONTBUFFER_BITS_PER_PIPE * I915_MAX_PIPES >
5577 sizeof(atomic_t) * BITS_PER_BYTE);
5580 WARN_ON(!(atomic_read(&old->frontbuffer_bits) & frontbuffer_bits));
5581 atomic_andnot(frontbuffer_bits, &old->frontbuffer_bits);
5585 WARN_ON(atomic_read(&new->frontbuffer_bits) & frontbuffer_bits);
5586 atomic_or(frontbuffer_bits, &new->frontbuffer_bits);
5590 /* Allocate a new GEM object and fill it with the supplied data */
5591 struct drm_i915_gem_object *
5592 i915_gem_object_create_from_data(struct drm_i915_private *dev_priv,
5593 const void *data, size_t size)
5595 struct drm_i915_gem_object *obj;
5600 obj = i915_gem_object_create(dev_priv, round_up(size, PAGE_SIZE));
5604 GEM_BUG_ON(obj->base.write_domain != I915_GEM_DOMAIN_CPU);
5606 file = obj->base.filp;
5609 unsigned int len = min_t(typeof(size), size, PAGE_SIZE);
5611 void *pgdata, *vaddr;
5613 err = pagecache_write_begin(file, file->f_mapping,
5620 memcpy(vaddr, data, len);
5623 err = pagecache_write_end(file, file->f_mapping,
5637 i915_gem_object_put(obj);
5638 return ERR_PTR(err);
5641 struct scatterlist *
5642 i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
5644 unsigned int *offset)
5646 struct i915_gem_object_page_iter *iter = &obj->mm.get_page;
5647 struct scatterlist *sg;
5648 unsigned int idx, count;
5651 GEM_BUG_ON(n >= obj->base.size >> PAGE_SHIFT);
5652 GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
5654 /* As we iterate forward through the sg, we record each entry in a
5655 * radixtree for quick repeated (backwards) lookups. If we have seen
5656 * this index previously, we will have an entry for it.
5658 * Initial lookup is O(N), but this is amortized to O(1) for
5659 * sequential page access (where each new request is consecutive
5660 * to the previous one). Repeated lookups are O(lg(obj->base.size)),
5661 * i.e. O(1) with a large constant!
5663 if (n < READ_ONCE(iter->sg_idx))
5666 mutex_lock(&iter->lock);
5668 /* We prefer to reuse the last sg so that repeated lookup of this
5669 * (or the subsequent) sg are fast - comparing against the last
5670 * sg is faster than going through the radixtree.
5675 count = __sg_page_count(sg);
5677 while (idx + count <= n) {
5678 unsigned long exception, i;
5681 /* If we cannot allocate and insert this entry, or the
5682 * individual pages from this range, cancel updating the
5683 * sg_idx so that on this lookup we are forced to linearly
5684 * scan onwards, but on future lookups we will try the
5685 * insertion again (in which case we need to be careful of
5686 * the error return reporting that we have already inserted
5689 ret = radix_tree_insert(&iter->radix, idx, sg);
5690 if (ret && ret != -EEXIST)
5694 RADIX_TREE_EXCEPTIONAL_ENTRY |
5695 idx << RADIX_TREE_EXCEPTIONAL_SHIFT;
5696 for (i = 1; i < count; i++) {
5697 ret = radix_tree_insert(&iter->radix, idx + i,
5699 if (ret && ret != -EEXIST)
5704 sg = ____sg_next(sg);
5705 count = __sg_page_count(sg);
5712 mutex_unlock(&iter->lock);
5714 if (unlikely(n < idx)) /* insertion completed by another thread */
5717 /* In case we failed to insert the entry into the radixtree, we need
5718 * to look beyond the current sg.
5720 while (idx + count <= n) {
5722 sg = ____sg_next(sg);
5723 count = __sg_page_count(sg);
5732 sg = radix_tree_lookup(&iter->radix, n);
5735 /* If this index is in the middle of multi-page sg entry,
5736 * the radixtree will contain an exceptional entry that points
5737 * to the start of that range. We will return the pointer to
5738 * the base page and the offset of this page within the
5742 if (unlikely(radix_tree_exception(sg))) {
5743 unsigned long base =
5744 (unsigned long)sg >> RADIX_TREE_EXCEPTIONAL_SHIFT;
5746 sg = radix_tree_lookup(&iter->radix, base);
5758 i915_gem_object_get_page(struct drm_i915_gem_object *obj, unsigned int n)
5760 struct scatterlist *sg;
5761 unsigned int offset;
5763 GEM_BUG_ON(!i915_gem_object_has_struct_page(obj));
5765 sg = i915_gem_object_get_sg(obj, n, &offset);
5766 return nth_page(sg_page(sg), offset);
5769 /* Like i915_gem_object_get_page(), but mark the returned page dirty */
5771 i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
5776 page = i915_gem_object_get_page(obj, n);
5778 set_page_dirty(page);
5784 i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
5787 struct scatterlist *sg;
5788 unsigned int offset;
5790 sg = i915_gem_object_get_sg(obj, n, &offset);
5791 return sg_dma_address(sg) + (offset << PAGE_SHIFT);
5794 int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
5796 struct sg_table *pages;
5799 if (align > obj->base.size)
5802 if (obj->ops == &i915_gem_phys_ops)
5805 if (obj->ops != &i915_gem_object_ops)
5808 err = i915_gem_object_unbind(obj);
5812 mutex_lock(&obj->mm.lock);
5814 if (obj->mm.madv != I915_MADV_WILLNEED) {
5819 if (obj->mm.quirked) {
5824 if (obj->mm.mapping) {
5829 pages = fetch_and_zero(&obj->mm.pages);
5831 struct drm_i915_private *i915 = to_i915(obj->base.dev);
5833 __i915_gem_object_reset_page_iter(obj);
5835 spin_lock(&i915->mm.obj_lock);
5836 list_del(&obj->mm.link);
5837 spin_unlock(&i915->mm.obj_lock);
5840 obj->ops = &i915_gem_phys_ops;
5842 err = ____i915_gem_object_get_pages(obj);
5846 /* Perma-pin (until release) the physical set of pages */
5847 __i915_gem_object_pin_pages(obj);
5849 if (!IS_ERR_OR_NULL(pages))
5850 i915_gem_object_ops.put_pages(obj, pages);
5851 mutex_unlock(&obj->mm.lock);
5855 obj->ops = &i915_gem_object_ops;
5856 obj->mm.pages = pages;
5858 mutex_unlock(&obj->mm.lock);
5862 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
5863 #include "selftests/scatterlist.c"
5864 #include "selftests/mock_gem_device.c"
5865 #include "selftests/huge_gem_object.c"
5866 #include "selftests/huge_pages.c"
5867 #include "selftests/i915_gem_object.c"
5868 #include "selftests/i915_gem_coherency.c"