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
27 * notice, this list of conditions and the following disclaimer in
28 * the documentation and/or other materials provided with the
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
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 __poll_t 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, unsigned long arg, u32 len);
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, unsigned long arg, u32 len);
88 static int get_base_info(struct hfi1_filedata *fd, unsigned long arg, u32 len);
89 static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg,
91 static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg,
93 static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg,
95 static int setup_base_ctxt(struct hfi1_filedata *fd,
96 struct hfi1_ctxtdata *uctxt);
97 static int setup_subctxt(struct hfi1_ctxtdata *uctxt);
99 static int find_sub_ctxt(struct hfi1_filedata *fd,
100 const struct hfi1_user_info *uinfo);
101 static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
102 struct hfi1_user_info *uinfo,
103 struct hfi1_ctxtdata **cd);
104 static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt);
105 static __poll_t poll_urgent(struct file *fp, struct poll_table_struct *pt);
106 static __poll_t poll_next(struct file *fp, struct poll_table_struct *pt);
107 static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt,
109 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg);
110 static int ctxt_reset(struct hfi1_ctxtdata *uctxt);
111 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt,
113 static int vma_fault(struct vm_fault *vmf);
114 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
117 static const struct file_operations hfi1_file_ops = {
118 .owner = THIS_MODULE,
119 .write_iter = hfi1_write_iter,
120 .open = hfi1_file_open,
121 .release = hfi1_file_close,
122 .unlocked_ioctl = hfi1_file_ioctl,
124 .mmap = hfi1_file_mmap,
125 .llseek = noop_llseek,
128 static const struct vm_operations_struct vm_ops = {
133 * Types of memories mapped into user processes' space
152 * Masks and offsets defining the mmap tokens
154 #define HFI1_MMAP_OFFSET_MASK 0xfffULL
155 #define HFI1_MMAP_OFFSET_SHIFT 0
156 #define HFI1_MMAP_SUBCTXT_MASK 0xfULL
157 #define HFI1_MMAP_SUBCTXT_SHIFT 12
158 #define HFI1_MMAP_CTXT_MASK 0xffULL
159 #define HFI1_MMAP_CTXT_SHIFT 16
160 #define HFI1_MMAP_TYPE_MASK 0xfULL
161 #define HFI1_MMAP_TYPE_SHIFT 24
162 #define HFI1_MMAP_MAGIC_MASK 0xffffffffULL
163 #define HFI1_MMAP_MAGIC_SHIFT 32
165 #define HFI1_MMAP_MAGIC 0xdabbad00
167 #define HFI1_MMAP_TOKEN_SET(field, val) \
168 (((val) & HFI1_MMAP_##field##_MASK) << HFI1_MMAP_##field##_SHIFT)
169 #define HFI1_MMAP_TOKEN_GET(field, token) \
170 (((token) >> HFI1_MMAP_##field##_SHIFT) & HFI1_MMAP_##field##_MASK)
171 #define HFI1_MMAP_TOKEN(type, ctxt, subctxt, addr) \
172 (HFI1_MMAP_TOKEN_SET(MAGIC, HFI1_MMAP_MAGIC) | \
173 HFI1_MMAP_TOKEN_SET(TYPE, type) | \
174 HFI1_MMAP_TOKEN_SET(CTXT, ctxt) | \
175 HFI1_MMAP_TOKEN_SET(SUBCTXT, subctxt) | \
176 HFI1_MMAP_TOKEN_SET(OFFSET, (offset_in_page(addr))))
178 #define dbg(fmt, ...) \
179 pr_info(fmt, ##__VA_ARGS__)
181 static inline int is_valid_mmap(u64 token)
183 return (HFI1_MMAP_TOKEN_GET(MAGIC, token) == HFI1_MMAP_MAGIC);
186 static int hfi1_file_open(struct inode *inode, struct file *fp)
188 struct hfi1_filedata *fd;
189 struct hfi1_devdata *dd = container_of(inode->i_cdev,
193 if (!((dd->flags & HFI1_PRESENT) && dd->kregbase1))
196 if (!atomic_inc_not_zero(&dd->user_refcount))
199 /* Just take a ref now. Not all opens result in a context assign */
200 kobject_get(&dd->kobj);
202 /* The real work is performed later in assign_ctxt() */
204 fd = kzalloc(sizeof(*fd), GFP_KERNEL);
207 fd->rec_cpu_num = -1; /* no cpu affinity by default */
208 fd->mm = current->mm;
211 fp->private_data = fd;
213 fp->private_data = NULL;
215 if (atomic_dec_and_test(&dd->user_refcount))
216 complete(&dd->user_comp);
224 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
227 struct hfi1_filedata *fd = fp->private_data;
228 struct hfi1_ctxtdata *uctxt = fd->uctxt;
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:
240 ret = assign_ctxt(fd, arg, _IOC_SIZE(cmd));
243 case HFI1_IOCTL_CTXT_INFO:
244 ret = get_ctxt_info(fd, arg, _IOC_SIZE(cmd));
247 case HFI1_IOCTL_USER_INFO:
248 ret = get_base_info(fd, arg, _IOC_SIZE(cmd));
251 case HFI1_IOCTL_CREDIT_UPD:
253 sc_return_credits(uctxt->sc);
256 case HFI1_IOCTL_TID_UPDATE:
257 ret = user_exp_rcv_setup(fd, arg, _IOC_SIZE(cmd));
260 case HFI1_IOCTL_TID_FREE:
261 ret = user_exp_rcv_clear(fd, arg, _IOC_SIZE(cmd));
264 case HFI1_IOCTL_TID_INVAL_READ:
265 ret = user_exp_rcv_invalid(fd, arg, _IOC_SIZE(cmd));
268 case HFI1_IOCTL_RECV_CTRL:
269 ret = manage_rcvq(uctxt, fd->subctxt, arg);
272 case HFI1_IOCTL_POLL_TYPE:
273 if (get_user(uval, (int __user *)arg))
275 uctxt->poll_type = (typeof(uctxt->poll_type))uval;
278 case HFI1_IOCTL_ACK_EVENT:
279 ret = user_event_ack(uctxt, fd->subctxt, arg);
282 case HFI1_IOCTL_SET_PKEY:
283 ret = set_ctxt_pkey(uctxt, arg);
286 case HFI1_IOCTL_CTXT_RESET:
287 ret = ctxt_reset(uctxt);
290 case HFI1_IOCTL_GET_VERS:
291 uval = HFI1_USER_SWVERSION;
292 if (put_user(uval, (int __user *)arg))
303 static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from)
305 struct hfi1_filedata *fd = kiocb->ki_filp->private_data;
306 struct hfi1_user_sdma_pkt_q *pq = fd->pq;
307 struct hfi1_user_sdma_comp_q *cq = fd->cq;
308 int done = 0, reqs = 0;
309 unsigned long dim = from->nr_segs;
314 if (!iter_is_iovec(from) || !dim)
317 trace_hfi1_sdma_request(fd->dd, fd->uctxt->ctxt, fd->subctxt, dim);
319 if (atomic_read(&pq->n_reqs) == pq->n_max_reqs)
324 unsigned long count = 0;
326 ret = hfi1_user_sdma_process_request(
327 fd, (struct iovec *)(from->iov + done),
341 static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
343 struct hfi1_filedata *fd = fp->private_data;
344 struct hfi1_ctxtdata *uctxt = fd->uctxt;
345 struct hfi1_devdata *dd;
347 u64 token = vma->vm_pgoff << PAGE_SHIFT,
349 void *memvirt = NULL;
350 u8 subctxt, mapio = 0, vmf = 0, type;
355 if (!is_valid_mmap(token) || !uctxt ||
356 !(vma->vm_flags & VM_SHARED)) {
361 ctxt = HFI1_MMAP_TOKEN_GET(CTXT, token);
362 subctxt = HFI1_MMAP_TOKEN_GET(SUBCTXT, token);
363 type = HFI1_MMAP_TOKEN_GET(TYPE, token);
364 if (ctxt != uctxt->ctxt || subctxt != fd->subctxt) {
369 flags = vma->vm_flags;
374 memaddr = ((dd->physaddr + TXE_PIO_SEND) +
376 (uctxt->sc->hw_context * BIT(16))) +
377 /* 64K PIO space / ctxt */
378 (type == PIO_BUFS_SOP ?
379 (TXE_PIO_SIZE / 2) : 0); /* sop? */
381 * Map only the amount allocated to the context, not the
382 * entire available context's PIO space.
384 memlen = PAGE_ALIGN(uctxt->sc->credits * PIO_BLOCK_SIZE);
385 flags &= ~VM_MAYREAD;
386 flags |= VM_DONTCOPY | VM_DONTEXPAND;
387 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
391 if (flags & VM_WRITE) {
396 * The credit return location for this context could be on the
397 * second or third page allocated for credit returns (if number
398 * of enabled contexts > 64 and 128 respectively).
400 memvirt = dd->cr_base[uctxt->numa_id].va;
401 memaddr = virt_to_phys(memvirt) +
402 (((u64)uctxt->sc->hw_free -
403 (u64)dd->cr_base[uctxt->numa_id].va) & PAGE_MASK);
405 flags &= ~VM_MAYWRITE;
406 flags |= VM_DONTCOPY | VM_DONTEXPAND;
408 * The driver has already allocated memory for credit
409 * returns and programmed it into the chip. Has that
410 * memory been flagged as non-cached?
412 /* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
416 memlen = uctxt->rcvhdrq_size;
417 memvirt = uctxt->rcvhdrq;
423 * The RcvEgr buffer need to be handled differently
424 * as multiple non-contiguous pages need to be mapped
425 * into the user process.
427 memlen = uctxt->egrbufs.size;
428 if ((vma->vm_end - vma->vm_start) != memlen) {
429 dd_dev_err(dd, "Eager buffer map size invalid (%lu != %lu)\n",
430 (vma->vm_end - vma->vm_start), memlen);
434 if (vma->vm_flags & VM_WRITE) {
438 vma->vm_flags &= ~VM_MAYWRITE;
439 addr = vma->vm_start;
440 for (i = 0 ; i < uctxt->egrbufs.numbufs; i++) {
441 memlen = uctxt->egrbufs.buffers[i].len;
442 memvirt = uctxt->egrbufs.buffers[i].addr;
443 ret = remap_pfn_range(
446 * virt_to_pfn() does the same, but
447 * it's not available on x86_64
448 * when CONFIG_MMU is enabled.
450 PFN_DOWN(__pa(memvirt)),
462 * Map only the page that contains this context's user
465 memaddr = (unsigned long)
466 (dd->physaddr + RXE_PER_CONTEXT_USER)
467 + (uctxt->ctxt * RXE_PER_CONTEXT_SIZE);
469 * TidFlow table is on the same page as the rest of the
473 flags |= VM_DONTCOPY | VM_DONTEXPAND;
474 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
479 * Use the page where this context's flags are. User level
480 * knows where it's own bitmap is within the page.
482 memaddr = (unsigned long)
483 (dd->events + uctxt_offset(uctxt)) & PAGE_MASK;
486 * v3.7 removes VM_RESERVED but the effect is kept by
489 flags |= VM_IO | VM_DONTEXPAND;
493 if (flags & (unsigned long)(VM_WRITE | VM_EXEC)) {
497 memaddr = kvirt_to_phys((void *)dd->status);
499 flags |= VM_IO | VM_DONTEXPAND;
502 if (!HFI1_CAP_IS_USET(DMA_RTAIL)) {
504 * If the memory allocation failed, the context alloc
505 * also would have failed, so we would never get here
510 if (flags & VM_WRITE) {
515 memvirt = (void *)uctxt->rcvhdrtail_kvaddr;
516 flags &= ~VM_MAYWRITE;
519 memaddr = (u64)uctxt->subctxt_uregbase;
521 flags |= VM_IO | VM_DONTEXPAND;
524 case SUBCTXT_RCV_HDRQ:
525 memaddr = (u64)uctxt->subctxt_rcvhdr_base;
526 memlen = uctxt->rcvhdrq_size * uctxt->subctxt_cnt;
527 flags |= VM_IO | VM_DONTEXPAND;
531 memaddr = (u64)uctxt->subctxt_rcvegrbuf;
532 memlen = uctxt->egrbufs.size * uctxt->subctxt_cnt;
533 flags |= VM_IO | VM_DONTEXPAND;
534 flags &= ~VM_MAYWRITE;
538 struct hfi1_user_sdma_comp_q *cq = fd->cq;
544 memaddr = (u64)cq->comps;
545 memlen = PAGE_ALIGN(sizeof(*cq->comps) * cq->nentries);
546 flags |= VM_IO | VM_DONTEXPAND;
555 if ((vma->vm_end - vma->vm_start) != memlen) {
556 hfi1_cdbg(PROC, "%u:%u Memory size mismatch %lu:%lu",
557 uctxt->ctxt, fd->subctxt,
558 (vma->vm_end - vma->vm_start), memlen);
563 vma->vm_flags = flags;
565 "%u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n",
566 ctxt, subctxt, type, mapio, vmf, memaddr, memlen,
567 vma->vm_end - vma->vm_start, vma->vm_flags);
569 vma->vm_pgoff = PFN_DOWN(memaddr);
570 vma->vm_ops = &vm_ops;
573 ret = io_remap_pfn_range(vma, vma->vm_start,
577 } else if (memvirt) {
578 ret = remap_pfn_range(vma, vma->vm_start,
579 PFN_DOWN(__pa(memvirt)),
583 ret = remap_pfn_range(vma, vma->vm_start,
593 * Local (non-chip) user memory is not mapped right away but as it is
594 * accessed by the user-level code.
596 static int vma_fault(struct vm_fault *vmf)
600 page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
602 return VM_FAULT_SIGBUS;
610 static __poll_t hfi1_poll(struct file *fp, struct poll_table_struct *pt)
612 struct hfi1_ctxtdata *uctxt;
615 uctxt = ((struct hfi1_filedata *)fp->private_data)->uctxt;
618 else if (uctxt->poll_type == HFI1_POLL_TYPE_URGENT)
619 pollflag = poll_urgent(fp, pt);
620 else if (uctxt->poll_type == HFI1_POLL_TYPE_ANYRCV)
621 pollflag = poll_next(fp, pt);
628 static int hfi1_file_close(struct inode *inode, struct file *fp)
630 struct hfi1_filedata *fdata = fp->private_data;
631 struct hfi1_ctxtdata *uctxt = fdata->uctxt;
632 struct hfi1_devdata *dd = container_of(inode->i_cdev,
635 unsigned long flags, *ev;
637 fp->private_data = NULL;
642 hfi1_cdbg(PROC, "closing ctxt %u:%u", uctxt->ctxt, fdata->subctxt);
645 /* drain user sdma queue */
646 hfi1_user_sdma_free_queues(fdata, uctxt);
648 /* release the cpu */
649 hfi1_put_proc_affinity(fdata->rec_cpu_num);
651 /* clean up rcv side */
652 hfi1_user_exp_rcv_free(fdata);
655 * fdata->uctxt is used in the above cleanup. It is not ready to be
656 * removed until here.
662 * Clear any left over, unhandled events so the next process that
663 * gets this context doesn't get confused.
665 ev = dd->events + uctxt_offset(uctxt) + fdata->subctxt;
668 spin_lock_irqsave(&dd->uctxt_lock, flags);
669 __clear_bit(fdata->subctxt, uctxt->in_use_ctxts);
670 if (!bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) {
671 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
674 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
677 * Disable receive context and interrupt available, reset all
678 * RcvCtxtCtrl bits to default values.
680 hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
681 HFI1_RCVCTRL_TIDFLOW_DIS |
682 HFI1_RCVCTRL_INTRAVAIL_DIS |
683 HFI1_RCVCTRL_TAILUPD_DIS |
684 HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
685 HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
686 HFI1_RCVCTRL_NO_EGR_DROP_DIS, uctxt);
687 /* Clear the context's J_KEY */
688 hfi1_clear_ctxt_jkey(dd, uctxt);
690 * If a send context is allocated, reset context integrity
691 * checks to default and disable the send context.
694 set_pio_integrity(uctxt->sc);
695 sc_disable(uctxt->sc);
698 hfi1_free_ctxt_rcv_groups(uctxt);
699 hfi1_clear_ctxt_pkey(dd, uctxt);
701 uctxt->event_flags = 0;
703 deallocate_ctxt(uctxt);
706 kobject_put(&dd->kobj);
708 if (atomic_dec_and_test(&dd->user_refcount))
709 complete(&dd->user_comp);
716 * Convert kernel *virtual* addresses to physical addresses.
717 * This is used to vmalloc'ed addresses.
719 static u64 kvirt_to_phys(void *addr)
724 page = vmalloc_to_page(addr);
726 paddr = page_to_pfn(page) << PAGE_SHIFT;
733 * @fd: valid filedata pointer
735 * Sub-context info can only be set up after the base context
736 * has been completed. This is indicated by the clearing of the
737 * HFI1_CTXT_BASE_UINIT bit.
739 * Wait for the bit to be cleared, and then complete the subcontext
743 static int complete_subctxt(struct hfi1_filedata *fd)
749 * sub-context info can only be set up after the base context
750 * has been completed.
752 ret = wait_event_interruptible(
754 !test_bit(HFI1_CTXT_BASE_UNINIT, &fd->uctxt->event_flags));
756 if (test_bit(HFI1_CTXT_BASE_FAILED, &fd->uctxt->event_flags))
759 /* Finish the sub-context init */
761 fd->rec_cpu_num = hfi1_get_proc_affinity(fd->uctxt->numa_id);
762 ret = init_user_ctxt(fd, fd->uctxt);
766 spin_lock_irqsave(&fd->dd->uctxt_lock, flags);
767 __clear_bit(fd->subctxt, fd->uctxt->in_use_ctxts);
768 spin_unlock_irqrestore(&fd->dd->uctxt_lock, flags);
769 hfi1_rcd_put(fd->uctxt);
776 static int assign_ctxt(struct hfi1_filedata *fd, unsigned long arg, u32 len)
779 unsigned int swmajor;
780 struct hfi1_ctxtdata *uctxt = NULL;
781 struct hfi1_user_info uinfo;
786 if (sizeof(uinfo) != len)
789 if (copy_from_user(&uinfo, (void __user *)arg, sizeof(uinfo)))
792 swmajor = uinfo.userversion >> 16;
793 if (swmajor != HFI1_USER_SWMAJOR)
796 if (uinfo.subctxt_cnt > HFI1_MAX_SHARED_CTXTS)
800 * Acquire the mutex to protect against multiple creations of what
801 * could be a shared base context.
803 mutex_lock(&hfi1_mutex);
805 * Get a sub context if available (fd->uctxt will be set).
806 * ret < 0 error, 0 no context, 1 sub-context found
808 ret = find_sub_ctxt(fd, &uinfo);
811 * Allocate a base context if context sharing is not required or a
812 * sub context wasn't found.
815 ret = allocate_ctxt(fd, fd->dd, &uinfo, &uctxt);
817 mutex_unlock(&hfi1_mutex);
819 /* Depending on the context type, finish the appropriate init */
822 ret = setup_base_ctxt(fd, uctxt);
824 deallocate_ctxt(uctxt);
827 ret = complete_subctxt(fd);
838 * @fd: valid filedata pointer
839 * @uinfo: user info to compare base context with
840 * @uctxt: context to compare uinfo to.
842 * Compare the given context with the given information to see if it
843 * can be used for a sub context.
845 static int match_ctxt(struct hfi1_filedata *fd,
846 const struct hfi1_user_info *uinfo,
847 struct hfi1_ctxtdata *uctxt)
849 struct hfi1_devdata *dd = fd->dd;
853 /* Skip dynamically allocated kernel contexts */
854 if (uctxt->sc && (uctxt->sc->type == SC_KERNEL))
857 /* Skip ctxt if it doesn't match the requested one */
858 if (memcmp(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid)) ||
859 uctxt->jkey != generate_jkey(current_uid()) ||
860 uctxt->subctxt_id != uinfo->subctxt_id ||
861 uctxt->subctxt_cnt != uinfo->subctxt_cnt)
864 /* Verify the sharing process matches the base */
865 if (uctxt->userversion != uinfo->userversion)
868 /* Find an unused sub context */
869 spin_lock_irqsave(&dd->uctxt_lock, flags);
870 if (bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) {
871 /* context is being closed, do not use */
872 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
876 subctxt = find_first_zero_bit(uctxt->in_use_ctxts,
877 HFI1_MAX_SHARED_CTXTS);
878 if (subctxt >= uctxt->subctxt_cnt) {
879 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
883 fd->subctxt = subctxt;
884 __set_bit(fd->subctxt, uctxt->in_use_ctxts);
885 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
895 * @fd: valid filedata pointer
896 * @uinfo: matching info to use to find a possible context to share.
898 * The hfi1_mutex must be held when this function is called. It is
899 * necessary to ensure serialized creation of shared contexts.
902 * 0 No sub-context found
903 * 1 Subcontext found and allocated
904 * errno EINVAL (incorrect parameters)
905 * EBUSY (all sub contexts in use)
907 static int find_sub_ctxt(struct hfi1_filedata *fd,
908 const struct hfi1_user_info *uinfo)
910 struct hfi1_ctxtdata *uctxt;
911 struct hfi1_devdata *dd = fd->dd;
915 if (!uinfo->subctxt_cnt)
918 for (i = dd->first_dyn_alloc_ctxt; i < dd->num_rcv_contexts; i++) {
919 uctxt = hfi1_rcd_get_by_index(dd, i);
921 ret = match_ctxt(fd, uinfo, uctxt);
923 /* value of != 0 will return */
932 static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
933 struct hfi1_user_info *uinfo,
934 struct hfi1_ctxtdata **rcd)
936 struct hfi1_ctxtdata *uctxt;
939 if (dd->flags & HFI1_FROZEN) {
941 * Pick an error that is unique from all other errors
942 * that are returned so the user process knows that
943 * it tried to allocate while the SPC was frozen. It
944 * it should be able to retry with success in a short
954 * If we don't have a NUMA node requested, preference is towards
957 fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node);
958 if (fd->rec_cpu_num != -1)
959 numa = cpu_to_node(fd->rec_cpu_num);
961 numa = numa_node_id();
962 ret = hfi1_create_ctxtdata(dd->pport, numa, &uctxt);
964 dd_dev_err(dd, "user ctxtdata allocation failed\n");
967 hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)",
968 uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num,
972 * Allocate and enable a PIO send context.
974 uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize, dd->node);
979 hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index,
980 uctxt->sc->hw_context);
981 ret = sc_enable(uctxt->sc);
986 * Setup sub context information if the user-level has requested
988 * This has to be done here so the rest of the sub-contexts find the
989 * proper base context.
991 if (uinfo->subctxt_cnt)
992 init_subctxts(uctxt, uinfo);
993 uctxt->userversion = uinfo->userversion;
994 uctxt->flags = hfi1_cap_mask; /* save current flag state */
995 init_waitqueue_head(&uctxt->wait);
996 strlcpy(uctxt->comm, current->comm, sizeof(uctxt->comm));
997 memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid));
998 uctxt->jkey = generate_jkey(current_uid());
999 hfi1_stats.sps_ctxts++;
1001 * Disable ASPM when there are open user/PSM contexts to avoid
1002 * issues with ASPM L1 exit latency
1004 if (dd->freectxts-- == dd->num_user_contexts)
1005 aspm_disable_all(dd);
1012 hfi1_free_ctxt(uctxt);
1016 static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt)
1018 mutex_lock(&hfi1_mutex);
1019 hfi1_stats.sps_ctxts--;
1020 if (++uctxt->dd->freectxts == uctxt->dd->num_user_contexts)
1021 aspm_enable_all(uctxt->dd);
1022 mutex_unlock(&hfi1_mutex);
1024 hfi1_free_ctxt(uctxt);
1027 static void init_subctxts(struct hfi1_ctxtdata *uctxt,
1028 const struct hfi1_user_info *uinfo)
1030 uctxt->subctxt_cnt = uinfo->subctxt_cnt;
1031 uctxt->subctxt_id = uinfo->subctxt_id;
1032 set_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
1035 static int setup_subctxt(struct hfi1_ctxtdata *uctxt)
1038 u16 num_subctxts = uctxt->subctxt_cnt;
1040 uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE);
1041 if (!uctxt->subctxt_uregbase)
1044 /* We can take the size of the RcvHdr Queue from the master */
1045 uctxt->subctxt_rcvhdr_base = vmalloc_user(uctxt->rcvhdrq_size *
1047 if (!uctxt->subctxt_rcvhdr_base) {
1052 uctxt->subctxt_rcvegrbuf = vmalloc_user(uctxt->egrbufs.size *
1054 if (!uctxt->subctxt_rcvegrbuf) {
1062 vfree(uctxt->subctxt_rcvhdr_base);
1063 uctxt->subctxt_rcvhdr_base = NULL;
1065 vfree(uctxt->subctxt_uregbase);
1066 uctxt->subctxt_uregbase = NULL;
1071 static void user_init(struct hfi1_ctxtdata *uctxt)
1073 unsigned int rcvctrl_ops = 0;
1075 /* initialize poll variables... */
1077 uctxt->urgent_poll = 0;
1080 * Now enable the ctxt for receive.
1081 * For chips that are set to DMA the tail register to memory
1082 * when they change (and when the update bit transitions from
1083 * 0 to 1. So for those chips, we turn it off and then back on.
1084 * This will (very briefly) affect any other open ctxts, but the
1085 * duration is very short, and therefore isn't an issue. We
1086 * explicitly set the in-memory tail copy to 0 beforehand, so we
1087 * don't have to wait to be sure the DMA update has happened
1088 * (chip resets head/tail to 0 on transition to enable).
1090 if (uctxt->rcvhdrtail_kvaddr)
1091 clear_rcvhdrtail(uctxt);
1093 /* Setup J_KEY before enabling the context */
1094 hfi1_set_ctxt_jkey(uctxt->dd, uctxt, uctxt->jkey);
1096 rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB;
1097 if (HFI1_CAP_UGET_MASK(uctxt->flags, HDRSUPP))
1098 rcvctrl_ops |= HFI1_RCVCTRL_TIDFLOW_ENB;
1100 * Ignore the bit in the flags for now until proper
1101 * support for multiple packet per rcv array entry is
1104 if (!HFI1_CAP_UGET_MASK(uctxt->flags, MULTI_PKT_EGR))
1105 rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
1106 if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_EGR_FULL))
1107 rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
1108 if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
1109 rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
1111 * The RcvCtxtCtrl.TailUpd bit has to be explicitly written.
1112 * We can't rely on the correct value to be set from prior
1113 * uses of the chip or ctxt. Therefore, add the rcvctrl op
1116 if (HFI1_CAP_UGET_MASK(uctxt->flags, DMA_RTAIL))
1117 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;
1119 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_DIS;
1120 hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt);
1123 static int get_ctxt_info(struct hfi1_filedata *fd, unsigned long arg, u32 len)
1125 struct hfi1_ctxt_info cinfo;
1126 struct hfi1_ctxtdata *uctxt = fd->uctxt;
1128 if (sizeof(cinfo) != len)
1131 memset(&cinfo, 0, sizeof(cinfo));
1132 cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) &
1133 HFI1_CAP_MISC_MASK) << HFI1_CAP_USER_SHIFT) |
1134 HFI1_CAP_UGET_MASK(uctxt->flags, MASK) |
1135 HFI1_CAP_KGET_MASK(uctxt->flags, K2U);
1136 /* adjust flag if this fd is not able to cache */
1138 cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */
1140 cinfo.num_active = hfi1_count_active_units();
1141 cinfo.unit = uctxt->dd->unit;
1142 cinfo.ctxt = uctxt->ctxt;
1143 cinfo.subctxt = fd->subctxt;
1144 cinfo.rcvtids = roundup(uctxt->egrbufs.alloced,
1145 uctxt->dd->rcv_entries.group_size) +
1146 uctxt->expected_count;
1147 cinfo.credits = uctxt->sc->credits;
1148 cinfo.numa_node = uctxt->numa_id;
1149 cinfo.rec_cpu = fd->rec_cpu_num;
1150 cinfo.send_ctxt = uctxt->sc->hw_context;
1152 cinfo.egrtids = uctxt->egrbufs.alloced;
1153 cinfo.rcvhdrq_cnt = uctxt->rcvhdrq_cnt;
1154 cinfo.rcvhdrq_entsize = uctxt->rcvhdrqentsize << 2;
1155 cinfo.sdma_ring_size = fd->cq->nentries;
1156 cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size;
1158 trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, fd->subctxt, cinfo);
1159 if (copy_to_user((void __user *)arg, &cinfo, len))
1165 static int init_user_ctxt(struct hfi1_filedata *fd,
1166 struct hfi1_ctxtdata *uctxt)
1170 ret = hfi1_user_sdma_alloc_queues(uctxt, fd);
1174 ret = hfi1_user_exp_rcv_init(fd, uctxt);
1176 hfi1_user_sdma_free_queues(fd, uctxt);
1181 static int setup_base_ctxt(struct hfi1_filedata *fd,
1182 struct hfi1_ctxtdata *uctxt)
1184 struct hfi1_devdata *dd = uctxt->dd;
1187 hfi1_init_ctxt(uctxt->sc);
1189 /* Now allocate the RcvHdr queue and eager buffers. */
1190 ret = hfi1_create_rcvhdrq(dd, uctxt);
1194 ret = hfi1_setup_eagerbufs(uctxt);
1198 /* If sub-contexts are enabled, do the appropriate setup */
1199 if (uctxt->subctxt_cnt)
1200 ret = setup_subctxt(uctxt);
1204 ret = hfi1_alloc_ctxt_rcv_groups(uctxt);
1208 ret = init_user_ctxt(fd, uctxt);
1214 /* Now that the context is set up, the fd can get a reference. */
1216 hfi1_rcd_get(uctxt);
1219 if (uctxt->subctxt_cnt) {
1221 * On error, set the failed bit so sub-contexts will clean up
1225 set_bit(HFI1_CTXT_BASE_FAILED, &uctxt->event_flags);
1228 * Base context is done (successfully or not), notify anybody
1229 * using a sub-context that is waiting for this completion.
1231 clear_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
1232 wake_up(&uctxt->wait);
1238 static int get_base_info(struct hfi1_filedata *fd, unsigned long arg, u32 len)
1240 struct hfi1_base_info binfo;
1241 struct hfi1_ctxtdata *uctxt = fd->uctxt;
1242 struct hfi1_devdata *dd = uctxt->dd;
1245 trace_hfi1_uctxtdata(uctxt->dd, uctxt, fd->subctxt);
1247 if (sizeof(binfo) != len)
1250 memset(&binfo, 0, sizeof(binfo));
1251 binfo.hw_version = dd->revision;
1252 binfo.sw_version = HFI1_KERN_SWVERSION;
1253 binfo.bthqp = kdeth_qp;
1254 binfo.jkey = uctxt->jkey;
1256 * If more than 64 contexts are enabled the allocated credit
1257 * return will span two or three contiguous pages. Since we only
1258 * map the page containing the context's credit return address,
1259 * we need to calculate the offset in the proper page.
1261 offset = ((u64)uctxt->sc->hw_free -
1262 (u64)dd->cr_base[uctxt->numa_id].va) % PAGE_SIZE;
1263 binfo.sc_credits_addr = HFI1_MMAP_TOKEN(PIO_CRED, uctxt->ctxt,
1264 fd->subctxt, offset);
1265 binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt,
1267 uctxt->sc->base_addr);
1268 binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP,
1271 uctxt->sc->base_addr);
1272 binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt,
1275 binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt,
1277 uctxt->egrbufs.rcvtids[0].dma);
1278 binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt,
1282 * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE))
1284 binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt,
1286 offset = offset_in_page((uctxt_offset(uctxt) + fd->subctxt) *
1287 sizeof(*dd->events));
1288 binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt,
1291 binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt,
1294 if (HFI1_CAP_IS_USET(DMA_RTAIL))
1295 binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt,
1297 if (uctxt->subctxt_cnt) {
1298 binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS,
1301 binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ,
1304 binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF,
1309 if (copy_to_user((void __user *)arg, &binfo, len))
1316 * user_exp_rcv_setup - Set up the given tid rcv list
1317 * @fd: file data of the current driver instance
1318 * @arg: ioctl argumnent for user space information
1319 * @len: length of data structure associated with ioctl command
1321 * Wrapper to validate ioctl information before doing _rcv_setup.
1324 static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg,
1329 struct hfi1_tid_info tinfo;
1331 if (sizeof(tinfo) != len)
1334 if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
1337 ret = hfi1_user_exp_rcv_setup(fd, &tinfo);
1340 * Copy the number of tidlist entries we used
1341 * and the length of the buffer we registered.
1343 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
1344 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
1345 sizeof(tinfo.tidcnt)))
1348 addr = arg + offsetof(struct hfi1_tid_info, length);
1349 if (copy_to_user((void __user *)addr, &tinfo.length,
1350 sizeof(tinfo.length)))
1358 * user_exp_rcv_clear - Clear the given tid rcv list
1359 * @fd: file data of the current driver instance
1360 * @arg: ioctl argumnent for user space information
1361 * @len: length of data structure associated with ioctl command
1363 * The hfi1_user_exp_rcv_clear() can be called from the error path. Because
1364 * of this, we need to use this wrapper to copy the user space information
1365 * before doing the clear.
1367 static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg,
1372 struct hfi1_tid_info tinfo;
1374 if (sizeof(tinfo) != len)
1377 if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
1380 ret = hfi1_user_exp_rcv_clear(fd, &tinfo);
1382 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
1383 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
1384 sizeof(tinfo.tidcnt)))
1392 * user_exp_rcv_invalid - Invalidate the given tid rcv list
1393 * @fd: file data of the current driver instance
1394 * @arg: ioctl argumnent for user space information
1395 * @len: length of data structure associated with ioctl command
1397 * Wrapper to validate ioctl information before doing _rcv_invalid.
1400 static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg,
1405 struct hfi1_tid_info tinfo;
1407 if (sizeof(tinfo) != len)
1410 if (!fd->invalid_tids)
1413 if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
1416 ret = hfi1_user_exp_rcv_invalid(fd, &tinfo);
1420 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
1421 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
1422 sizeof(tinfo.tidcnt)))
1428 static __poll_t poll_urgent(struct file *fp,
1429 struct poll_table_struct *pt)
1431 struct hfi1_filedata *fd = fp->private_data;
1432 struct hfi1_ctxtdata *uctxt = fd->uctxt;
1433 struct hfi1_devdata *dd = uctxt->dd;
1436 poll_wait(fp, &uctxt->wait, pt);
1438 spin_lock_irq(&dd->uctxt_lock);
1439 if (uctxt->urgent != uctxt->urgent_poll) {
1440 pollflag = POLLIN | POLLRDNORM;
1441 uctxt->urgent_poll = uctxt->urgent;
1444 set_bit(HFI1_CTXT_WAITING_URG, &uctxt->event_flags);
1446 spin_unlock_irq(&dd->uctxt_lock);
1451 static __poll_t poll_next(struct file *fp,
1452 struct poll_table_struct *pt)
1454 struct hfi1_filedata *fd = fp->private_data;
1455 struct hfi1_ctxtdata *uctxt = fd->uctxt;
1456 struct hfi1_devdata *dd = uctxt->dd;
1459 poll_wait(fp, &uctxt->wait, pt);
1461 spin_lock_irq(&dd->uctxt_lock);
1462 if (hdrqempty(uctxt)) {
1463 set_bit(HFI1_CTXT_WAITING_RCV, &uctxt->event_flags);
1464 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_ENB, uctxt);
1467 pollflag = POLLIN | POLLRDNORM;
1469 spin_unlock_irq(&dd->uctxt_lock);
1475 * Find all user contexts in use, and set the specified bit in their
1477 * See also find_ctxt() for a similar use, that is specific to send buffers.
1479 int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit)
1481 struct hfi1_ctxtdata *uctxt;
1482 struct hfi1_devdata *dd = ppd->dd;
1488 for (ctxt = dd->first_dyn_alloc_ctxt; ctxt < dd->num_rcv_contexts;
1490 uctxt = hfi1_rcd_get_by_index(dd, ctxt);
1495 * subctxt_cnt is 0 if not shared, so do base
1496 * separately, first, then remaining subctxt, if any
1498 evs = dd->events + uctxt_offset(uctxt);
1499 set_bit(evtbit, evs);
1500 for (i = 1; i < uctxt->subctxt_cnt; i++)
1501 set_bit(evtbit, evs + i);
1502 hfi1_rcd_put(uctxt);
1510 * manage_rcvq - manage a context's receive queue
1511 * @uctxt: the context
1512 * @subctxt: the sub-context
1513 * @start_stop: action to carry out
1515 * start_stop == 0 disables receive on the context, for use in queue
1516 * overflow conditions. start_stop==1 re-enables, to be used to
1517 * re-init the software copy of the head register
1519 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt,
1522 struct hfi1_devdata *dd = uctxt->dd;
1523 unsigned int rcvctrl_op;
1529 if (get_user(start_stop, (int __user *)arg))
1532 /* atomically clear receive enable ctxt. */
1535 * On enable, force in-memory copy of the tail register to
1536 * 0, so that protocol code doesn't have to worry about
1537 * whether or not the chip has yet updated the in-memory
1538 * copy or not on return from the system call. The chip
1539 * always resets it's tail register back to 0 on a
1540 * transition from disabled to enabled.
1542 if (uctxt->rcvhdrtail_kvaddr)
1543 clear_rcvhdrtail(uctxt);
1544 rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB;
1546 rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS;
1548 hfi1_rcvctrl(dd, rcvctrl_op, uctxt);
1549 /* always; new head should be equal to new tail; see above */
1555 * clear the event notifier events for this context.
1556 * User process then performs actions appropriate to bit having been
1557 * set, if desired, and checks again in future.
1559 static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt,
1563 struct hfi1_devdata *dd = uctxt->dd;
1565 unsigned long events;
1570 if (get_user(events, (unsigned long __user *)arg))
1573 evs = dd->events + uctxt_offset(uctxt) + subctxt;
1575 for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) {
1576 if (!test_bit(i, &events))
1583 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg)
1586 struct hfi1_pportdata *ppd = uctxt->ppd;
1587 struct hfi1_devdata *dd = uctxt->dd;
1590 if (!HFI1_CAP_IS_USET(PKEY_CHECK))
1593 if (get_user(pkey, (u16 __user *)arg))
1596 if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY)
1599 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++)
1600 if (pkey == ppd->pkeys[i])
1601 return hfi1_set_ctxt_pkey(dd, uctxt, pkey);
1607 * ctxt_reset - Reset the user context
1608 * @uctxt: valid user context
1610 static int ctxt_reset(struct hfi1_ctxtdata *uctxt)
1612 struct send_context *sc;
1613 struct hfi1_devdata *dd;
1616 if (!uctxt || !uctxt->dd || !uctxt->sc)
1620 * There is no protection here. User level has to guarantee that
1621 * no one will be writing to the send context while it is being
1622 * re-initialized. If user level breaks that guarantee, it will
1623 * break it's own context and no one else's.
1629 * Wait until the interrupt handler has marked the context as
1630 * halted or frozen. Report error if we time out.
1632 wait_event_interruptible_timeout(
1633 sc->halt_wait, (sc->flags & SCF_HALTED),
1634 msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
1635 if (!(sc->flags & SCF_HALTED))
1639 * If the send context was halted due to a Freeze, wait until the
1640 * device has been "unfrozen" before resetting the context.
1642 if (sc->flags & SCF_FROZEN) {
1643 wait_event_interruptible_timeout(
1645 !(READ_ONCE(dd->flags) & HFI1_FROZEN),
1646 msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
1647 if (dd->flags & HFI1_FROZEN)
1650 if (dd->flags & HFI1_FORCED_FREEZE)
1652 * Don't allow context reset if we are into
1658 ret = sc_enable(sc);
1659 hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_ENB, uctxt);
1661 ret = sc_restart(sc);
1664 sc_return_credits(sc);
1669 static void user_remove(struct hfi1_devdata *dd)
1672 hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device);
1675 static int user_add(struct hfi1_devdata *dd)
1680 snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit);
1681 ret = hfi1_cdev_init(dd->unit, name, &hfi1_file_ops,
1682 &dd->user_cdev, &dd->user_device,
1691 * Create per-unit files in /dev
1693 int hfi1_device_create(struct hfi1_devdata *dd)
1695 return user_add(dd);
1699 * Remove per-unit files in /dev
1700 * void, core kernel returns no errors for this stuff
1702 void hfi1_device_remove(struct hfi1_devdata *dd)