2 * Copyright (C) 2012 Russell King
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 #include <linux/dma-buf.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/shmem_fs.h>
11 #include "armada_drm.h"
12 #include "armada_gem.h"
13 #include <drm/armada_drm.h>
14 #include "armada_ioctlP.h"
16 static int armada_gem_vm_fault(struct vm_fault *vmf)
18 struct drm_gem_object *gobj = vmf->vma->vm_private_data;
19 struct armada_gem_object *obj = drm_to_armada_gem(gobj);
20 unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
23 pfn += (vmf->address - vmf->vma->vm_start) >> PAGE_SHIFT;
24 ret = vm_insert_pfn(vmf->vma, vmf->address, pfn);
29 return VM_FAULT_NOPAGE;
33 return VM_FAULT_SIGBUS;
37 const struct vm_operations_struct armada_gem_vm_ops = {
38 .fault = armada_gem_vm_fault,
39 .open = drm_gem_vm_open,
40 .close = drm_gem_vm_close,
43 static size_t roundup_gem_size(size_t size)
45 return roundup(size, PAGE_SIZE);
48 void armada_gem_free_object(struct drm_gem_object *obj)
50 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
51 struct armada_private *priv = obj->dev->dev_private;
53 DRM_DEBUG_DRIVER("release obj %p\n", dobj);
55 drm_gem_free_mmap_offset(&dobj->obj);
57 might_lock(&priv->linear_lock);
60 /* page backed memory */
61 unsigned int order = get_order(dobj->obj.size);
62 __free_pages(dobj->page, order);
63 } else if (dobj->linear) {
64 /* linear backed memory */
65 mutex_lock(&priv->linear_lock);
66 drm_mm_remove_node(dobj->linear);
67 mutex_unlock(&priv->linear_lock);
73 if (dobj->obj.import_attach) {
74 /* We only ever display imported data */
76 dma_buf_unmap_attachment(dobj->obj.import_attach,
77 dobj->sgt, DMA_TO_DEVICE);
78 drm_prime_gem_destroy(&dobj->obj, NULL);
81 drm_gem_object_release(&dobj->obj);
87 armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
89 struct armada_private *priv = dev->dev_private;
90 size_t size = obj->obj.size;
92 if (obj->page || obj->linear)
96 * If it is a small allocation (typically cursor, which will
97 * be 32x64 or 64x32 ARGB pixels) try to get it from the system.
98 * Framebuffers will never be this small (our minimum size for
99 * framebuffers is larger than this anyway.) Such objects are
100 * only accessed by the CPU so we don't need any special handing
104 unsigned int order = get_order(size);
105 struct page *p = alloc_pages(GFP_KERNEL, order);
108 obj->addr = page_address(p);
109 obj->phys_addr = page_to_phys(p);
112 memset(obj->addr, 0, PAGE_ALIGN(size));
117 * We could grab something from CMA if it's enabled, but that
118 * involves building in a problem:
120 * CMA's interface uses dma_alloc_coherent(), which provides us
121 * with an CPU virtual address and a device address.
123 * The CPU virtual address may be either an address in the kernel
124 * direct mapped region (for example, as it would be on x86) or
125 * it may be remapped into another part of kernel memory space
126 * (eg, as it would be on ARM.) This means virt_to_phys() on the
127 * returned virtual address is invalid depending on the architecture
130 * The device address may also not be a physical address; it may
131 * be that there is some kind of remapping between the device and
132 * system RAM, which makes the use of the device address also
133 * unsafe to re-use as a physical address.
135 * This makes DRM usage of dma_alloc_coherent() in a generic way
136 * at best very questionable and unsafe.
139 /* Otherwise, grab it from our linear allocation */
141 struct drm_mm_node *node;
142 unsigned align = min_t(unsigned, size, SZ_2M);
146 node = kzalloc(sizeof(*node), GFP_KERNEL);
150 mutex_lock(&priv->linear_lock);
151 ret = drm_mm_insert_node_generic(&priv->linear, node,
153 mutex_unlock(&priv->linear_lock);
161 /* Ensure that the memory we're returning is cleared. */
162 ptr = ioremap_wc(obj->linear->start, size);
164 mutex_lock(&priv->linear_lock);
165 drm_mm_remove_node(obj->linear);
166 mutex_unlock(&priv->linear_lock);
172 memset_io(ptr, 0, size);
175 obj->phys_addr = obj->linear->start;
176 obj->dev_addr = obj->linear->start;
180 DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj,
181 (unsigned long long)obj->phys_addr,
182 (unsigned long long)obj->dev_addr);
188 armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj)
190 /* only linear objects need to be ioremap'd */
191 if (!dobj->addr && dobj->linear)
192 dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size);
196 struct armada_gem_object *
197 armada_gem_alloc_private_object(struct drm_device *dev, size_t size)
199 struct armada_gem_object *obj;
201 size = roundup_gem_size(size);
203 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
207 drm_gem_private_object_init(dev, &obj->obj, size);
209 DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size);
214 static struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev,
217 struct armada_gem_object *obj;
218 struct address_space *mapping;
220 size = roundup_gem_size(size);
222 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
226 if (drm_gem_object_init(dev, &obj->obj, size)) {
231 mapping = obj->obj.filp->f_mapping;
232 mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);
234 DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size);
239 /* Dumb alloc support */
240 int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
241 struct drm_mode_create_dumb *args)
243 struct armada_gem_object *dobj;
248 args->pitch = armada_pitch(args->width, args->bpp);
249 args->size = size = args->pitch * args->height;
251 dobj = armada_gem_alloc_private_object(dev, size);
255 ret = armada_gem_linear_back(dev, dobj);
259 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
263 args->handle = handle;
265 /* drop reference from allocate - handle holds it now */
266 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
268 drm_gem_object_put_unlocked(&dobj->obj);
272 /* Private driver gem ioctls */
273 int armada_gem_create_ioctl(struct drm_device *dev, void *data,
274 struct drm_file *file)
276 struct drm_armada_gem_create *args = data;
277 struct armada_gem_object *dobj;
287 dobj = armada_gem_alloc_object(dev, size);
291 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
295 args->handle = handle;
297 /* drop reference from allocate - handle holds it now */
298 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
300 drm_gem_object_put_unlocked(&dobj->obj);
304 /* Map a shmem-backed object into process memory space */
305 int armada_gem_mmap_ioctl(struct drm_device *dev, void *data,
306 struct drm_file *file)
308 struct drm_armada_gem_mmap *args = data;
309 struct armada_gem_object *dobj;
312 dobj = armada_gem_object_lookup(file, args->handle);
316 if (!dobj->obj.filp) {
317 drm_gem_object_put_unlocked(&dobj->obj);
321 addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
322 MAP_SHARED, args->offset);
323 drm_gem_object_put_unlocked(&dobj->obj);
324 if (IS_ERR_VALUE(addr))
332 int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
333 struct drm_file *file)
335 struct drm_armada_gem_pwrite *args = data;
336 struct armada_gem_object *dobj;
340 DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
341 args->handle, args->offset, args->size, args->ptr);
346 ptr = (char __user *)(uintptr_t)args->ptr;
348 if (!access_ok(VERIFY_READ, ptr, args->size))
351 ret = fault_in_pages_readable(ptr, args->size);
355 dobj = armada_gem_object_lookup(file, args->handle);
359 /* Must be a kernel-mapped object */
363 if (args->offset > dobj->obj.size ||
364 args->size > dobj->obj.size - args->offset) {
365 DRM_ERROR("invalid size: object size %u\n", dobj->obj.size);
370 if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) {
372 } else if (dobj->update) {
373 dobj->update(dobj->update_data);
378 drm_gem_object_put_unlocked(&dobj->obj);
383 static struct sg_table *
384 armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
385 enum dma_data_direction dir)
387 struct drm_gem_object *obj = attach->dmabuf->priv;
388 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
389 struct scatterlist *sg;
390 struct sg_table *sgt;
393 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
397 if (dobj->obj.filp) {
398 struct address_space *mapping;
401 count = dobj->obj.size / PAGE_SIZE;
402 if (sg_alloc_table(sgt, count, GFP_KERNEL))
405 mapping = dobj->obj.filp->f_mapping;
407 for_each_sg(sgt->sgl, sg, count, i) {
410 page = shmem_read_mapping_page(mapping, i);
416 sg_set_page(sg, page, PAGE_SIZE, 0);
419 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) {
423 } else if (dobj->page) {
424 /* Single contiguous page */
425 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
428 sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0);
430 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
432 } else if (dobj->linear) {
433 /* Single contiguous physical region - no struct page */
434 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
436 sg_dma_address(sgt->sgl) = dobj->dev_addr;
437 sg_dma_len(sgt->sgl) = dobj->obj.size;
444 for_each_sg(sgt->sgl, sg, num, i)
445 put_page(sg_page(sg));
453 static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
454 struct sg_table *sgt, enum dma_data_direction dir)
456 struct drm_gem_object *obj = attach->dmabuf->priv;
457 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
461 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
463 if (dobj->obj.filp) {
464 struct scatterlist *sg;
465 for_each_sg(sgt->sgl, sg, sgt->nents, i)
466 put_page(sg_page(sg));
473 static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n)
479 armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr)
484 armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
489 static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
490 .map_dma_buf = armada_gem_prime_map_dma_buf,
491 .unmap_dma_buf = armada_gem_prime_unmap_dma_buf,
492 .release = drm_gem_dmabuf_release,
493 .map_atomic = armada_gem_dmabuf_no_kmap,
494 .unmap_atomic = armada_gem_dmabuf_no_kunmap,
495 .map = armada_gem_dmabuf_no_kmap,
496 .unmap = armada_gem_dmabuf_no_kunmap,
497 .mmap = armada_gem_dmabuf_mmap,
501 armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
504 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
506 exp_info.ops = &armada_gem_prime_dmabuf_ops;
507 exp_info.size = obj->size;
508 exp_info.flags = O_RDWR;
511 return drm_gem_dmabuf_export(dev, &exp_info);
514 struct drm_gem_object *
515 armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
517 struct dma_buf_attachment *attach;
518 struct armada_gem_object *dobj;
520 if (buf->ops == &armada_gem_prime_dmabuf_ops) {
521 struct drm_gem_object *obj = buf->priv;
522 if (obj->dev == dev) {
524 * Importing our own dmabuf(s) increases the
525 * refcount on the gem object itself.
527 drm_gem_object_get(obj);
532 attach = dma_buf_attach(buf, dev->dev);
534 return ERR_CAST(attach);
536 dobj = armada_gem_alloc_private_object(dev, buf->size);
538 dma_buf_detach(buf, attach);
539 return ERR_PTR(-ENOMEM);
542 dobj->obj.import_attach = attach;
546 * Don't call dma_buf_map_attachment() here - it maps the
547 * scatterlist immediately for DMA, and this is not always
548 * an appropriate thing to do.
553 int armada_gem_map_import(struct armada_gem_object *dobj)
557 dobj->sgt = dma_buf_map_attachment(dobj->obj.import_attach,
559 if (IS_ERR(dobj->sgt)) {
560 ret = PTR_ERR(dobj->sgt);
562 DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret);
565 if (dobj->sgt->nents > 1) {
566 DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n");
569 if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) {
570 DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n");
573 dobj->dev_addr = sg_dma_address(dobj->sgt->sgl);