2 * Copyright(c) 2015-2017 Intel Corporation.
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * - Redistributions in binary form must reproduce the above copyright
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30 * - Neither the name of Intel Corporation nor the names of its
31 * contributors may be used to endorse or promote products derived
32 * from this software without specific prior written permission.
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
47 #include <linux/poll.h>
48 #include <linux/cdev.h>
49 #include <linux/vmalloc.h>
51 #include <linux/sched/mm.h>
52 #include <linux/bitmap.h>
62 #include "user_sdma.h"
63 #include "user_exp_rcv.h"
67 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
69 #define SEND_CTXT_HALT_TIMEOUT 1000 /* msecs */
72 * File operation functions
74 static int hfi1_file_open(struct inode *inode, struct file *fp);
75 static int hfi1_file_close(struct inode *inode, struct file *fp);
76 static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from);
77 static unsigned int hfi1_poll(struct file *fp, struct poll_table_struct *pt);
78 static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma);
80 static u64 kvirt_to_phys(void *addr);
81 static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo);
82 static void init_subctxts(struct hfi1_ctxtdata *uctxt,
83 const struct hfi1_user_info *uinfo);
84 static int init_user_ctxt(struct hfi1_filedata *fd,
85 struct hfi1_ctxtdata *uctxt);
86 static void user_init(struct hfi1_ctxtdata *uctxt);
87 static int get_ctxt_info(struct hfi1_filedata *fd, void __user *ubase,
89 static int get_base_info(struct hfi1_filedata *fd, void __user *ubase,
91 static int setup_base_ctxt(struct hfi1_filedata *fd,
92 struct hfi1_ctxtdata *uctxt);
93 static int setup_subctxt(struct hfi1_ctxtdata *uctxt);
95 static int find_sub_ctxt(struct hfi1_filedata *fd,
96 const struct hfi1_user_info *uinfo);
97 static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
98 struct hfi1_user_info *uinfo,
99 struct hfi1_ctxtdata **cd);
100 static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt);
101 static unsigned int poll_urgent(struct file *fp, struct poll_table_struct *pt);
102 static unsigned int poll_next(struct file *fp, struct poll_table_struct *pt);
103 static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt,
104 unsigned long events);
105 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, u16 subctxt, u16 pkey);
106 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt,
108 static int vma_fault(struct vm_fault *vmf);
109 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
112 static const struct file_operations hfi1_file_ops = {
113 .owner = THIS_MODULE,
114 .write_iter = hfi1_write_iter,
115 .open = hfi1_file_open,
116 .release = hfi1_file_close,
117 .unlocked_ioctl = hfi1_file_ioctl,
119 .mmap = hfi1_file_mmap,
120 .llseek = noop_llseek,
123 static const struct vm_operations_struct vm_ops = {
128 * Types of memories mapped into user processes' space
147 * Masks and offsets defining the mmap tokens
149 #define HFI1_MMAP_OFFSET_MASK 0xfffULL
150 #define HFI1_MMAP_OFFSET_SHIFT 0
151 #define HFI1_MMAP_SUBCTXT_MASK 0xfULL
152 #define HFI1_MMAP_SUBCTXT_SHIFT 12
153 #define HFI1_MMAP_CTXT_MASK 0xffULL
154 #define HFI1_MMAP_CTXT_SHIFT 16
155 #define HFI1_MMAP_TYPE_MASK 0xfULL
156 #define HFI1_MMAP_TYPE_SHIFT 24
157 #define HFI1_MMAP_MAGIC_MASK 0xffffffffULL
158 #define HFI1_MMAP_MAGIC_SHIFT 32
160 #define HFI1_MMAP_MAGIC 0xdabbad00
162 #define HFI1_MMAP_TOKEN_SET(field, val) \
163 (((val) & HFI1_MMAP_##field##_MASK) << HFI1_MMAP_##field##_SHIFT)
164 #define HFI1_MMAP_TOKEN_GET(field, token) \
165 (((token) >> HFI1_MMAP_##field##_SHIFT) & HFI1_MMAP_##field##_MASK)
166 #define HFI1_MMAP_TOKEN(type, ctxt, subctxt, addr) \
167 (HFI1_MMAP_TOKEN_SET(MAGIC, HFI1_MMAP_MAGIC) | \
168 HFI1_MMAP_TOKEN_SET(TYPE, type) | \
169 HFI1_MMAP_TOKEN_SET(CTXT, ctxt) | \
170 HFI1_MMAP_TOKEN_SET(SUBCTXT, subctxt) | \
171 HFI1_MMAP_TOKEN_SET(OFFSET, (offset_in_page(addr))))
173 #define dbg(fmt, ...) \
174 pr_info(fmt, ##__VA_ARGS__)
176 static inline int is_valid_mmap(u64 token)
178 return (HFI1_MMAP_TOKEN_GET(MAGIC, token) == HFI1_MMAP_MAGIC);
181 static int hfi1_file_open(struct inode *inode, struct file *fp)
183 struct hfi1_filedata *fd;
184 struct hfi1_devdata *dd = container_of(inode->i_cdev,
188 if (!((dd->flags & HFI1_PRESENT) && dd->kregbase1))
191 if (!atomic_inc_not_zero(&dd->user_refcount))
194 /* Just take a ref now. Not all opens result in a context assign */
195 kobject_get(&dd->kobj);
197 /* The real work is performed later in assign_ctxt() */
199 fd = kzalloc(sizeof(*fd), GFP_KERNEL);
202 fd->rec_cpu_num = -1; /* no cpu affinity by default */
203 fd->mm = current->mm;
206 fp->private_data = fd;
208 fp->private_data = NULL;
210 if (atomic_dec_and_test(&dd->user_refcount))
211 complete(&dd->user_comp);
219 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
222 struct hfi1_filedata *fd = fp->private_data;
223 struct hfi1_ctxtdata *uctxt = fd->uctxt;
224 struct hfi1_user_info uinfo;
225 struct hfi1_tid_info tinfo;
229 unsigned long ul_uval = 0;
232 hfi1_cdbg(IOCTL, "IOCTL recv: 0x%x", cmd);
233 if (cmd != HFI1_IOCTL_ASSIGN_CTXT &&
234 cmd != HFI1_IOCTL_GET_VERS &&
239 case HFI1_IOCTL_ASSIGN_CTXT:
243 if (copy_from_user(&uinfo,
244 (struct hfi1_user_info __user *)arg,
248 ret = assign_ctxt(fd, &uinfo);
250 case HFI1_IOCTL_CTXT_INFO:
251 ret = get_ctxt_info(fd, (void __user *)(unsigned long)arg,
252 sizeof(struct hfi1_ctxt_info));
254 case HFI1_IOCTL_USER_INFO:
255 ret = get_base_info(fd, (void __user *)(unsigned long)arg,
256 sizeof(struct hfi1_base_info));
258 case HFI1_IOCTL_CREDIT_UPD:
260 sc_return_credits(uctxt->sc);
263 case HFI1_IOCTL_TID_UPDATE:
264 if (copy_from_user(&tinfo,
265 (struct hfi11_tid_info __user *)arg,
269 ret = hfi1_user_exp_rcv_setup(fd, &tinfo);
272 * Copy the number of tidlist entries we used
273 * and the length of the buffer we registered.
275 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
276 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
277 sizeof(tinfo.tidcnt)))
280 addr = arg + offsetof(struct hfi1_tid_info, length);
281 if (copy_to_user((void __user *)addr, &tinfo.length,
282 sizeof(tinfo.length)))
287 case HFI1_IOCTL_TID_FREE:
288 if (copy_from_user(&tinfo,
289 (struct hfi11_tid_info __user *)arg,
293 ret = hfi1_user_exp_rcv_clear(fd, &tinfo);
296 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
297 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
298 sizeof(tinfo.tidcnt)))
302 case HFI1_IOCTL_TID_INVAL_READ:
303 if (copy_from_user(&tinfo,
304 (struct hfi11_tid_info __user *)arg,
308 ret = hfi1_user_exp_rcv_invalid(fd, &tinfo);
311 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
312 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
313 sizeof(tinfo.tidcnt)))
317 case HFI1_IOCTL_RECV_CTRL:
318 ret = get_user(uval, (int __user *)arg);
321 ret = manage_rcvq(uctxt, fd->subctxt, uval);
324 case HFI1_IOCTL_POLL_TYPE:
325 ret = get_user(uval, (int __user *)arg);
328 uctxt->poll_type = (typeof(uctxt->poll_type))uval;
331 case HFI1_IOCTL_ACK_EVENT:
332 ret = get_user(ul_uval, (unsigned long __user *)arg);
335 ret = user_event_ack(uctxt, fd->subctxt, ul_uval);
338 case HFI1_IOCTL_SET_PKEY:
339 ret = get_user(uval16, (u16 __user *)arg);
342 if (HFI1_CAP_IS_USET(PKEY_CHECK))
343 ret = set_ctxt_pkey(uctxt, fd->subctxt, uval16);
348 case HFI1_IOCTL_CTXT_RESET: {
349 struct send_context *sc;
350 struct hfi1_devdata *dd;
352 if (!uctxt || !uctxt->dd || !uctxt->sc)
356 * There is no protection here. User level has to
357 * guarantee that no one will be writing to the send
358 * context while it is being re-initialized.
359 * If user level breaks that guarantee, it will break
360 * it's own context and no one else's.
365 * Wait until the interrupt handler has marked the
366 * context as halted or frozen. Report error if we time
369 wait_event_interruptible_timeout(
370 sc->halt_wait, (sc->flags & SCF_HALTED),
371 msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
372 if (!(sc->flags & SCF_HALTED))
376 * If the send context was halted due to a Freeze,
377 * wait until the device has been "unfrozen" before
378 * resetting the context.
380 if (sc->flags & SCF_FROZEN) {
381 wait_event_interruptible_timeout(
383 !(ACCESS_ONCE(dd->flags) & HFI1_FROZEN),
384 msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
385 if (dd->flags & HFI1_FROZEN)
388 if (dd->flags & HFI1_FORCED_FREEZE)
390 * Don't allow context reset if we are into
397 hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_ENB, uctxt);
399 ret = sc_restart(sc);
402 sc_return_credits(sc);
406 case HFI1_IOCTL_GET_VERS:
407 uval = HFI1_USER_SWVERSION;
408 if (put_user(uval, (int __user *)arg))
419 static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from)
421 struct hfi1_filedata *fd = kiocb->ki_filp->private_data;
422 struct hfi1_user_sdma_pkt_q *pq = fd->pq;
423 struct hfi1_user_sdma_comp_q *cq = fd->cq;
424 int done = 0, reqs = 0;
425 unsigned long dim = from->nr_segs;
430 if (!iter_is_iovec(from) || !dim)
433 trace_hfi1_sdma_request(fd->dd, fd->uctxt->ctxt, fd->subctxt, dim);
435 if (atomic_read(&pq->n_reqs) == pq->n_max_reqs)
440 unsigned long count = 0;
442 ret = hfi1_user_sdma_process_request(
443 fd, (struct iovec *)(from->iov + done),
457 static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
459 struct hfi1_filedata *fd = fp->private_data;
460 struct hfi1_ctxtdata *uctxt = fd->uctxt;
461 struct hfi1_devdata *dd;
463 u64 token = vma->vm_pgoff << PAGE_SHIFT,
465 void *memvirt = NULL;
466 u8 subctxt, mapio = 0, vmf = 0, type;
471 if (!is_valid_mmap(token) || !uctxt ||
472 !(vma->vm_flags & VM_SHARED)) {
477 ctxt = HFI1_MMAP_TOKEN_GET(CTXT, token);
478 subctxt = HFI1_MMAP_TOKEN_GET(SUBCTXT, token);
479 type = HFI1_MMAP_TOKEN_GET(TYPE, token);
480 if (ctxt != uctxt->ctxt || subctxt != fd->subctxt) {
485 flags = vma->vm_flags;
490 memaddr = ((dd->physaddr + TXE_PIO_SEND) +
492 (uctxt->sc->hw_context * BIT(16))) +
493 /* 64K PIO space / ctxt */
494 (type == PIO_BUFS_SOP ?
495 (TXE_PIO_SIZE / 2) : 0); /* sop? */
497 * Map only the amount allocated to the context, not the
498 * entire available context's PIO space.
500 memlen = PAGE_ALIGN(uctxt->sc->credits * PIO_BLOCK_SIZE);
501 flags &= ~VM_MAYREAD;
502 flags |= VM_DONTCOPY | VM_DONTEXPAND;
503 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
507 if (flags & VM_WRITE) {
512 * The credit return location for this context could be on the
513 * second or third page allocated for credit returns (if number
514 * of enabled contexts > 64 and 128 respectively).
516 memvirt = dd->cr_base[uctxt->numa_id].va;
517 memaddr = virt_to_phys(memvirt) +
518 (((u64)uctxt->sc->hw_free -
519 (u64)dd->cr_base[uctxt->numa_id].va) & PAGE_MASK);
521 flags &= ~VM_MAYWRITE;
522 flags |= VM_DONTCOPY | VM_DONTEXPAND;
524 * The driver has already allocated memory for credit
525 * returns and programmed it into the chip. Has that
526 * memory been flagged as non-cached?
528 /* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
532 memlen = uctxt->rcvhdrq_size;
533 memvirt = uctxt->rcvhdrq;
539 * The RcvEgr buffer need to be handled differently
540 * as multiple non-contiguous pages need to be mapped
541 * into the user process.
543 memlen = uctxt->egrbufs.size;
544 if ((vma->vm_end - vma->vm_start) != memlen) {
545 dd_dev_err(dd, "Eager buffer map size invalid (%lu != %lu)\n",
546 (vma->vm_end - vma->vm_start), memlen);
550 if (vma->vm_flags & VM_WRITE) {
554 vma->vm_flags &= ~VM_MAYWRITE;
555 addr = vma->vm_start;
556 for (i = 0 ; i < uctxt->egrbufs.numbufs; i++) {
557 memlen = uctxt->egrbufs.buffers[i].len;
558 memvirt = uctxt->egrbufs.buffers[i].addr;
559 ret = remap_pfn_range(
562 * virt_to_pfn() does the same, but
563 * it's not available on x86_64
564 * when CONFIG_MMU is enabled.
566 PFN_DOWN(__pa(memvirt)),
578 * Map only the page that contains this context's user
581 memaddr = (unsigned long)
582 (dd->physaddr + RXE_PER_CONTEXT_USER)
583 + (uctxt->ctxt * RXE_PER_CONTEXT_SIZE);
585 * TidFlow table is on the same page as the rest of the
589 flags |= VM_DONTCOPY | VM_DONTEXPAND;
590 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
595 * Use the page where this context's flags are. User level
596 * knows where it's own bitmap is within the page.
598 memaddr = (unsigned long)(dd->events +
599 ((uctxt->ctxt - dd->first_dyn_alloc_ctxt) *
600 HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK;
603 * v3.7 removes VM_RESERVED but the effect is kept by
606 flags |= VM_IO | VM_DONTEXPAND;
610 if (flags & (unsigned long)(VM_WRITE | VM_EXEC)) {
614 memaddr = kvirt_to_phys((void *)dd->status);
616 flags |= VM_IO | VM_DONTEXPAND;
619 if (!HFI1_CAP_IS_USET(DMA_RTAIL)) {
621 * If the memory allocation failed, the context alloc
622 * also would have failed, so we would never get here
627 if (flags & VM_WRITE) {
632 memvirt = (void *)uctxt->rcvhdrtail_kvaddr;
633 flags &= ~VM_MAYWRITE;
636 memaddr = (u64)uctxt->subctxt_uregbase;
638 flags |= VM_IO | VM_DONTEXPAND;
641 case SUBCTXT_RCV_HDRQ:
642 memaddr = (u64)uctxt->subctxt_rcvhdr_base;
643 memlen = uctxt->rcvhdrq_size * uctxt->subctxt_cnt;
644 flags |= VM_IO | VM_DONTEXPAND;
648 memaddr = (u64)uctxt->subctxt_rcvegrbuf;
649 memlen = uctxt->egrbufs.size * uctxt->subctxt_cnt;
650 flags |= VM_IO | VM_DONTEXPAND;
651 flags &= ~VM_MAYWRITE;
655 struct hfi1_user_sdma_comp_q *cq = fd->cq;
661 memaddr = (u64)cq->comps;
662 memlen = PAGE_ALIGN(sizeof(*cq->comps) * cq->nentries);
663 flags |= VM_IO | VM_DONTEXPAND;
672 if ((vma->vm_end - vma->vm_start) != memlen) {
673 hfi1_cdbg(PROC, "%u:%u Memory size mismatch %lu:%lu",
674 uctxt->ctxt, fd->subctxt,
675 (vma->vm_end - vma->vm_start), memlen);
680 vma->vm_flags = flags;
682 "%u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n",
683 ctxt, subctxt, type, mapio, vmf, memaddr, memlen,
684 vma->vm_end - vma->vm_start, vma->vm_flags);
686 vma->vm_pgoff = PFN_DOWN(memaddr);
687 vma->vm_ops = &vm_ops;
690 ret = io_remap_pfn_range(vma, vma->vm_start,
694 } else if (memvirt) {
695 ret = remap_pfn_range(vma, vma->vm_start,
696 PFN_DOWN(__pa(memvirt)),
700 ret = remap_pfn_range(vma, vma->vm_start,
710 * Local (non-chip) user memory is not mapped right away but as it is
711 * accessed by the user-level code.
713 static int vma_fault(struct vm_fault *vmf)
717 page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
719 return VM_FAULT_SIGBUS;
727 static unsigned int hfi1_poll(struct file *fp, struct poll_table_struct *pt)
729 struct hfi1_ctxtdata *uctxt;
732 uctxt = ((struct hfi1_filedata *)fp->private_data)->uctxt;
735 else if (uctxt->poll_type == HFI1_POLL_TYPE_URGENT)
736 pollflag = poll_urgent(fp, pt);
737 else if (uctxt->poll_type == HFI1_POLL_TYPE_ANYRCV)
738 pollflag = poll_next(fp, pt);
745 static int hfi1_file_close(struct inode *inode, struct file *fp)
747 struct hfi1_filedata *fdata = fp->private_data;
748 struct hfi1_ctxtdata *uctxt = fdata->uctxt;
749 struct hfi1_devdata *dd = container_of(inode->i_cdev,
752 unsigned long flags, *ev;
754 fp->private_data = NULL;
759 hfi1_cdbg(PROC, "closing ctxt %u:%u", uctxt->ctxt, fdata->subctxt);
762 /* drain user sdma queue */
763 hfi1_user_sdma_free_queues(fdata, uctxt);
765 /* release the cpu */
766 hfi1_put_proc_affinity(fdata->rec_cpu_num);
768 /* clean up rcv side */
769 hfi1_user_exp_rcv_free(fdata);
772 * fdata->uctxt is used in the above cleanup. It is not ready to be
773 * removed until here.
779 * Clear any left over, unhandled events so the next process that
780 * gets this context doesn't get confused.
782 ev = dd->events + ((uctxt->ctxt - dd->first_dyn_alloc_ctxt) *
783 HFI1_MAX_SHARED_CTXTS) + fdata->subctxt;
786 spin_lock_irqsave(&dd->uctxt_lock, flags);
787 __clear_bit(fdata->subctxt, uctxt->in_use_ctxts);
788 if (!bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) {
789 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
792 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
795 * Disable receive context and interrupt available, reset all
796 * RcvCtxtCtrl bits to default values.
798 hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
799 HFI1_RCVCTRL_TIDFLOW_DIS |
800 HFI1_RCVCTRL_INTRAVAIL_DIS |
801 HFI1_RCVCTRL_TAILUPD_DIS |
802 HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
803 HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
804 HFI1_RCVCTRL_NO_EGR_DROP_DIS, uctxt);
805 /* Clear the context's J_KEY */
806 hfi1_clear_ctxt_jkey(dd, uctxt);
808 * If a send context is allocated, reset context integrity
809 * checks to default and disable the send context.
812 set_pio_integrity(uctxt->sc);
813 sc_disable(uctxt->sc);
816 hfi1_free_ctxt_rcv_groups(uctxt);
817 hfi1_clear_ctxt_pkey(dd, uctxt);
819 uctxt->event_flags = 0;
821 deallocate_ctxt(uctxt);
824 kobject_put(&dd->kobj);
826 if (atomic_dec_and_test(&dd->user_refcount))
827 complete(&dd->user_comp);
834 * Convert kernel *virtual* addresses to physical addresses.
835 * This is used to vmalloc'ed addresses.
837 static u64 kvirt_to_phys(void *addr)
842 page = vmalloc_to_page(addr);
844 paddr = page_to_pfn(page) << PAGE_SHIFT;
851 * @fd: valid filedata pointer
853 * Sub-context info can only be set up after the base context
854 * has been completed. This is indicated by the clearing of the
855 * HFI1_CTXT_BASE_UINIT bit.
857 * Wait for the bit to be cleared, and then complete the subcontext
861 static int complete_subctxt(struct hfi1_filedata *fd)
867 * sub-context info can only be set up after the base context
868 * has been completed.
870 ret = wait_event_interruptible(
872 !test_bit(HFI1_CTXT_BASE_UNINIT, &fd->uctxt->event_flags));
874 if (test_bit(HFI1_CTXT_BASE_FAILED, &fd->uctxt->event_flags))
877 /* Finish the sub-context init */
879 fd->rec_cpu_num = hfi1_get_proc_affinity(fd->uctxt->numa_id);
880 ret = init_user_ctxt(fd, fd->uctxt);
884 hfi1_rcd_put(fd->uctxt);
886 spin_lock_irqsave(&fd->dd->uctxt_lock, flags);
887 __clear_bit(fd->subctxt, fd->uctxt->in_use_ctxts);
888 spin_unlock_irqrestore(&fd->dd->uctxt_lock, flags);
894 static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo)
897 unsigned int swmajor, swminor;
898 struct hfi1_ctxtdata *uctxt = NULL;
900 swmajor = uinfo->userversion >> 16;
901 if (swmajor != HFI1_USER_SWMAJOR)
904 if (uinfo->subctxt_cnt > HFI1_MAX_SHARED_CTXTS)
907 swminor = uinfo->userversion & 0xffff;
910 * Acquire the mutex to protect against multiple creations of what
911 * could be a shared base context.
913 mutex_lock(&hfi1_mutex);
915 * Get a sub context if available (fd->uctxt will be set).
916 * ret < 0 error, 0 no context, 1 sub-context found
918 ret = find_sub_ctxt(fd, uinfo);
921 * Allocate a base context if context sharing is not required or a
922 * sub context wasn't found.
925 ret = allocate_ctxt(fd, fd->dd, uinfo, &uctxt);
927 mutex_unlock(&hfi1_mutex);
929 /* Depending on the context type, finish the appropriate init */
932 ret = setup_base_ctxt(fd, uctxt);
934 deallocate_ctxt(uctxt);
937 ret = complete_subctxt(fd);
948 * @fd: valid filedata pointer
949 * @uinfo: user info to compare base context with
950 * @uctxt: context to compare uinfo to.
952 * Compare the given context with the given information to see if it
953 * can be used for a sub context.
955 static int match_ctxt(struct hfi1_filedata *fd,
956 const struct hfi1_user_info *uinfo,
957 struct hfi1_ctxtdata *uctxt)
959 struct hfi1_devdata *dd = fd->dd;
963 /* Skip dynamically allocated kernel contexts */
964 if (uctxt->sc && (uctxt->sc->type == SC_KERNEL))
967 /* Skip ctxt if it doesn't match the requested one */
968 if (memcmp(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid)) ||
969 uctxt->jkey != generate_jkey(current_uid()) ||
970 uctxt->subctxt_id != uinfo->subctxt_id ||
971 uctxt->subctxt_cnt != uinfo->subctxt_cnt)
974 /* Verify the sharing process matches the base */
975 if (uctxt->userversion != uinfo->userversion)
978 /* Find an unused sub context */
979 spin_lock_irqsave(&dd->uctxt_lock, flags);
980 if (bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) {
981 /* context is being closed, do not use */
982 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
986 subctxt = find_first_zero_bit(uctxt->in_use_ctxts,
987 HFI1_MAX_SHARED_CTXTS);
988 if (subctxt >= uctxt->subctxt_cnt) {
989 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
993 fd->subctxt = subctxt;
994 __set_bit(fd->subctxt, uctxt->in_use_ctxts);
995 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1005 * @fd: valid filedata pointer
1006 * @uinfo: matching info to use to find a possible context to share.
1008 * The hfi1_mutex must be held when this function is called. It is
1009 * necessary to ensure serialized creation of shared contexts.
1012 * 0 No sub-context found
1013 * 1 Subcontext found and allocated
1014 * errno EINVAL (incorrect parameters)
1015 * EBUSY (all sub contexts in use)
1017 static int find_sub_ctxt(struct hfi1_filedata *fd,
1018 const struct hfi1_user_info *uinfo)
1020 struct hfi1_ctxtdata *uctxt;
1021 struct hfi1_devdata *dd = fd->dd;
1025 if (!uinfo->subctxt_cnt)
1028 for (i = dd->first_dyn_alloc_ctxt; i < dd->num_rcv_contexts; i++) {
1029 uctxt = hfi1_rcd_get_by_index(dd, i);
1031 ret = match_ctxt(fd, uinfo, uctxt);
1032 hfi1_rcd_put(uctxt);
1033 /* value of != 0 will return */
1042 static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
1043 struct hfi1_user_info *uinfo,
1044 struct hfi1_ctxtdata **rcd)
1046 struct hfi1_ctxtdata *uctxt;
1049 if (dd->flags & HFI1_FROZEN) {
1051 * Pick an error that is unique from all other errors
1052 * that are returned so the user process knows that
1053 * it tried to allocate while the SPC was frozen. It
1054 * it should be able to retry with success in a short
1064 * If we don't have a NUMA node requested, preference is towards
1067 fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node);
1068 if (fd->rec_cpu_num != -1)
1069 numa = cpu_to_node(fd->rec_cpu_num);
1071 numa = numa_node_id();
1072 ret = hfi1_create_ctxtdata(dd->pport, numa, &uctxt);
1074 dd_dev_err(dd, "user ctxtdata allocation failed\n");
1077 hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)",
1078 uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num,
1082 * Allocate and enable a PIO send context.
1084 uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize, dd->node);
1089 hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index,
1090 uctxt->sc->hw_context);
1091 ret = sc_enable(uctxt->sc);
1096 * Setup sub context information if the user-level has requested
1098 * This has to be done here so the rest of the sub-contexts find the
1099 * proper base context.
1101 if (uinfo->subctxt_cnt)
1102 init_subctxts(uctxt, uinfo);
1103 uctxt->userversion = uinfo->userversion;
1104 uctxt->flags = hfi1_cap_mask; /* save current flag state */
1105 init_waitqueue_head(&uctxt->wait);
1106 strlcpy(uctxt->comm, current->comm, sizeof(uctxt->comm));
1107 memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid));
1108 uctxt->jkey = generate_jkey(current_uid());
1109 hfi1_stats.sps_ctxts++;
1111 * Disable ASPM when there are open user/PSM contexts to avoid
1112 * issues with ASPM L1 exit latency
1114 if (dd->freectxts-- == dd->num_user_contexts)
1115 aspm_disable_all(dd);
1122 hfi1_free_ctxt(uctxt);
1126 static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt)
1128 mutex_lock(&hfi1_mutex);
1129 hfi1_stats.sps_ctxts--;
1130 if (++uctxt->dd->freectxts == uctxt->dd->num_user_contexts)
1131 aspm_enable_all(uctxt->dd);
1132 mutex_unlock(&hfi1_mutex);
1134 hfi1_free_ctxt(uctxt);
1137 static void init_subctxts(struct hfi1_ctxtdata *uctxt,
1138 const struct hfi1_user_info *uinfo)
1140 uctxt->subctxt_cnt = uinfo->subctxt_cnt;
1141 uctxt->subctxt_id = uinfo->subctxt_id;
1142 set_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
1145 static int setup_subctxt(struct hfi1_ctxtdata *uctxt)
1148 u16 num_subctxts = uctxt->subctxt_cnt;
1150 uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE);
1151 if (!uctxt->subctxt_uregbase)
1154 /* We can take the size of the RcvHdr Queue from the master */
1155 uctxt->subctxt_rcvhdr_base = vmalloc_user(uctxt->rcvhdrq_size *
1157 if (!uctxt->subctxt_rcvhdr_base) {
1162 uctxt->subctxt_rcvegrbuf = vmalloc_user(uctxt->egrbufs.size *
1164 if (!uctxt->subctxt_rcvegrbuf) {
1172 vfree(uctxt->subctxt_rcvhdr_base);
1173 uctxt->subctxt_rcvhdr_base = NULL;
1175 vfree(uctxt->subctxt_uregbase);
1176 uctxt->subctxt_uregbase = NULL;
1181 static void user_init(struct hfi1_ctxtdata *uctxt)
1183 unsigned int rcvctrl_ops = 0;
1185 /* initialize poll variables... */
1187 uctxt->urgent_poll = 0;
1190 * Now enable the ctxt for receive.
1191 * For chips that are set to DMA the tail register to memory
1192 * when they change (and when the update bit transitions from
1193 * 0 to 1. So for those chips, we turn it off and then back on.
1194 * This will (very briefly) affect any other open ctxts, but the
1195 * duration is very short, and therefore isn't an issue. We
1196 * explicitly set the in-memory tail copy to 0 beforehand, so we
1197 * don't have to wait to be sure the DMA update has happened
1198 * (chip resets head/tail to 0 on transition to enable).
1200 if (uctxt->rcvhdrtail_kvaddr)
1201 clear_rcvhdrtail(uctxt);
1203 /* Setup J_KEY before enabling the context */
1204 hfi1_set_ctxt_jkey(uctxt->dd, uctxt, uctxt->jkey);
1206 rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB;
1207 if (HFI1_CAP_UGET_MASK(uctxt->flags, HDRSUPP))
1208 rcvctrl_ops |= HFI1_RCVCTRL_TIDFLOW_ENB;
1210 * Ignore the bit in the flags for now until proper
1211 * support for multiple packet per rcv array entry is
1214 if (!HFI1_CAP_UGET_MASK(uctxt->flags, MULTI_PKT_EGR))
1215 rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
1216 if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_EGR_FULL))
1217 rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
1218 if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
1219 rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
1221 * The RcvCtxtCtrl.TailUpd bit has to be explicitly written.
1222 * We can't rely on the correct value to be set from prior
1223 * uses of the chip or ctxt. Therefore, add the rcvctrl op
1226 if (HFI1_CAP_UGET_MASK(uctxt->flags, DMA_RTAIL))
1227 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;
1229 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_DIS;
1230 hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt);
1233 static int get_ctxt_info(struct hfi1_filedata *fd, void __user *ubase,
1236 struct hfi1_ctxt_info cinfo;
1237 struct hfi1_ctxtdata *uctxt = fd->uctxt;
1240 memset(&cinfo, 0, sizeof(cinfo));
1241 cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) &
1242 HFI1_CAP_MISC_MASK) << HFI1_CAP_USER_SHIFT) |
1243 HFI1_CAP_UGET_MASK(uctxt->flags, MASK) |
1244 HFI1_CAP_KGET_MASK(uctxt->flags, K2U);
1245 /* adjust flag if this fd is not able to cache */
1247 cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */
1249 cinfo.num_active = hfi1_count_active_units();
1250 cinfo.unit = uctxt->dd->unit;
1251 cinfo.ctxt = uctxt->ctxt;
1252 cinfo.subctxt = fd->subctxt;
1253 cinfo.rcvtids = roundup(uctxt->egrbufs.alloced,
1254 uctxt->dd->rcv_entries.group_size) +
1255 uctxt->expected_count;
1256 cinfo.credits = uctxt->sc->credits;
1257 cinfo.numa_node = uctxt->numa_id;
1258 cinfo.rec_cpu = fd->rec_cpu_num;
1259 cinfo.send_ctxt = uctxt->sc->hw_context;
1261 cinfo.egrtids = uctxt->egrbufs.alloced;
1262 cinfo.rcvhdrq_cnt = uctxt->rcvhdrq_cnt;
1263 cinfo.rcvhdrq_entsize = uctxt->rcvhdrqentsize << 2;
1264 cinfo.sdma_ring_size = fd->cq->nentries;
1265 cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size;
1267 trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, fd->subctxt, cinfo);
1268 if (copy_to_user(ubase, &cinfo, sizeof(cinfo)))
1274 static int init_user_ctxt(struct hfi1_filedata *fd,
1275 struct hfi1_ctxtdata *uctxt)
1279 ret = hfi1_user_sdma_alloc_queues(uctxt, fd);
1283 ret = hfi1_user_exp_rcv_init(fd, uctxt);
1285 hfi1_user_sdma_free_queues(fd, uctxt);
1290 static int setup_base_ctxt(struct hfi1_filedata *fd,
1291 struct hfi1_ctxtdata *uctxt)
1293 struct hfi1_devdata *dd = uctxt->dd;
1296 hfi1_init_ctxt(uctxt->sc);
1298 /* Now allocate the RcvHdr queue and eager buffers. */
1299 ret = hfi1_create_rcvhdrq(dd, uctxt);
1303 ret = hfi1_setup_eagerbufs(uctxt);
1307 /* If sub-contexts are enabled, do the appropriate setup */
1308 if (uctxt->subctxt_cnt)
1309 ret = setup_subctxt(uctxt);
1313 ret = hfi1_alloc_ctxt_rcv_groups(uctxt);
1317 ret = init_user_ctxt(fd, uctxt);
1323 /* Now that the context is set up, the fd can get a reference. */
1325 hfi1_rcd_get(uctxt);
1328 if (uctxt->subctxt_cnt) {
1330 * On error, set the failed bit so sub-contexts will clean up
1334 set_bit(HFI1_CTXT_BASE_FAILED, &uctxt->event_flags);
1337 * Base context is done (successfully or not), notify anybody
1338 * using a sub-context that is waiting for this completion.
1340 clear_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
1341 wake_up(&uctxt->wait);
1347 static int get_base_info(struct hfi1_filedata *fd, void __user *ubase,
1350 struct hfi1_base_info binfo;
1351 struct hfi1_ctxtdata *uctxt = fd->uctxt;
1352 struct hfi1_devdata *dd = uctxt->dd;
1357 trace_hfi1_uctxtdata(uctxt->dd, uctxt, fd->subctxt);
1359 memset(&binfo, 0, sizeof(binfo));
1360 binfo.hw_version = dd->revision;
1361 binfo.sw_version = HFI1_KERN_SWVERSION;
1362 binfo.bthqp = kdeth_qp;
1363 binfo.jkey = uctxt->jkey;
1365 * If more than 64 contexts are enabled the allocated credit
1366 * return will span two or three contiguous pages. Since we only
1367 * map the page containing the context's credit return address,
1368 * we need to calculate the offset in the proper page.
1370 offset = ((u64)uctxt->sc->hw_free -
1371 (u64)dd->cr_base[uctxt->numa_id].va) % PAGE_SIZE;
1372 binfo.sc_credits_addr = HFI1_MMAP_TOKEN(PIO_CRED, uctxt->ctxt,
1373 fd->subctxt, offset);
1374 binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt,
1376 uctxt->sc->base_addr);
1377 binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP,
1380 uctxt->sc->base_addr);
1381 binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt,
1384 binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt,
1386 uctxt->egrbufs.rcvtids[0].dma);
1387 binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt,
1391 * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE))
1393 binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt,
1395 offset = offset_in_page((((uctxt->ctxt - dd->first_dyn_alloc_ctxt) *
1396 HFI1_MAX_SHARED_CTXTS) + fd->subctxt) *
1397 sizeof(*dd->events));
1398 binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt,
1401 binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt,
1404 if (HFI1_CAP_IS_USET(DMA_RTAIL))
1405 binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt,
1407 if (uctxt->subctxt_cnt) {
1408 binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS,
1411 binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ,
1414 binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF,
1418 sz = (len < sizeof(binfo)) ? len : sizeof(binfo);
1419 if (copy_to_user(ubase, &binfo, sz))
1424 static unsigned int poll_urgent(struct file *fp,
1425 struct poll_table_struct *pt)
1427 struct hfi1_filedata *fd = fp->private_data;
1428 struct hfi1_ctxtdata *uctxt = fd->uctxt;
1429 struct hfi1_devdata *dd = uctxt->dd;
1432 poll_wait(fp, &uctxt->wait, pt);
1434 spin_lock_irq(&dd->uctxt_lock);
1435 if (uctxt->urgent != uctxt->urgent_poll) {
1436 pollflag = POLLIN | POLLRDNORM;
1437 uctxt->urgent_poll = uctxt->urgent;
1440 set_bit(HFI1_CTXT_WAITING_URG, &uctxt->event_flags);
1442 spin_unlock_irq(&dd->uctxt_lock);
1447 static unsigned int poll_next(struct file *fp,
1448 struct poll_table_struct *pt)
1450 struct hfi1_filedata *fd = fp->private_data;
1451 struct hfi1_ctxtdata *uctxt = fd->uctxt;
1452 struct hfi1_devdata *dd = uctxt->dd;
1455 poll_wait(fp, &uctxt->wait, pt);
1457 spin_lock_irq(&dd->uctxt_lock);
1458 if (hdrqempty(uctxt)) {
1459 set_bit(HFI1_CTXT_WAITING_RCV, &uctxt->event_flags);
1460 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_ENB, uctxt);
1463 pollflag = POLLIN | POLLRDNORM;
1465 spin_unlock_irq(&dd->uctxt_lock);
1471 * Find all user contexts in use, and set the specified bit in their
1473 * See also find_ctxt() for a similar use, that is specific to send buffers.
1475 int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit)
1477 struct hfi1_ctxtdata *uctxt;
1478 struct hfi1_devdata *dd = ppd->dd;
1484 for (ctxt = dd->first_dyn_alloc_ctxt; ctxt < dd->num_rcv_contexts;
1486 uctxt = hfi1_rcd_get_by_index(dd, ctxt);
1488 unsigned long *evs = dd->events +
1489 (uctxt->ctxt - dd->first_dyn_alloc_ctxt) *
1490 HFI1_MAX_SHARED_CTXTS;
1493 * subctxt_cnt is 0 if not shared, so do base
1494 * separately, first, then remaining subctxt, if any
1496 set_bit(evtbit, evs);
1497 for (i = 1; i < uctxt->subctxt_cnt; i++)
1498 set_bit(evtbit, evs + i);
1499 hfi1_rcd_put(uctxt);
1507 * manage_rcvq - manage a context's receive queue
1508 * @uctxt: the context
1509 * @subctxt: the sub-context
1510 * @start_stop: action to carry out
1512 * start_stop == 0 disables receive on the context, for use in queue
1513 * overflow conditions. start_stop==1 re-enables, to be used to
1514 * re-init the software copy of the head register
1516 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt,
1519 struct hfi1_devdata *dd = uctxt->dd;
1520 unsigned int rcvctrl_op;
1524 /* atomically clear receive enable ctxt. */
1527 * On enable, force in-memory copy of the tail register to
1528 * 0, so that protocol code doesn't have to worry about
1529 * whether or not the chip has yet updated the in-memory
1530 * copy or not on return from the system call. The chip
1531 * always resets it's tail register back to 0 on a
1532 * transition from disabled to enabled.
1534 if (uctxt->rcvhdrtail_kvaddr)
1535 clear_rcvhdrtail(uctxt);
1536 rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB;
1538 rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS;
1540 hfi1_rcvctrl(dd, rcvctrl_op, uctxt);
1541 /* always; new head should be equal to new tail; see above */
1547 * clear the event notifier events for this context.
1548 * User process then performs actions appropriate to bit having been
1549 * set, if desired, and checks again in future.
1551 static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt,
1552 unsigned long events)
1555 struct hfi1_devdata *dd = uctxt->dd;
1561 evs = dd->events + ((uctxt->ctxt - dd->first_dyn_alloc_ctxt) *
1562 HFI1_MAX_SHARED_CTXTS) + subctxt;
1564 for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) {
1565 if (!test_bit(i, &events))
1572 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, u16 subctxt, u16 pkey)
1574 int ret = -ENOENT, i, intable = 0;
1575 struct hfi1_pportdata *ppd = uctxt->ppd;
1576 struct hfi1_devdata *dd = uctxt->dd;
1578 if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY) {
1583 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++)
1584 if (pkey == ppd->pkeys[i]) {
1590 ret = hfi1_set_ctxt_pkey(dd, uctxt, pkey);
1595 static void user_remove(struct hfi1_devdata *dd)
1598 hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device);
1601 static int user_add(struct hfi1_devdata *dd)
1606 snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit);
1607 ret = hfi1_cdev_init(dd->unit, name, &hfi1_file_ops,
1608 &dd->user_cdev, &dd->user_device,
1617 * Create per-unit files in /dev
1619 int hfi1_device_create(struct hfi1_devdata *dd)
1621 return user_add(dd);
1625 * Remove per-unit files in /dev
1626 * void, core kernel returns no errors for this stuff
1628 void hfi1_device_remove(struct hfi1_devdata *dd)