2 * Intel MIC Platform Software Stack (MPSS)
4 * Copyright(c) 2015 Intel Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2, as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
18 #include <linux/dma_remapping.h>
19 #include <linux/pagemap.h>
20 #include "scif_main.h"
23 /* Used to skip ulimit checks for registrations with SCIF_MAP_KERNEL flag */
24 #define SCIF_MAP_ULIMIT 0x40
26 bool scif_ulimit_check = 1;
32 * Initialize RMA per EP data structures.
34 void scif_rma_ep_init(struct scif_endpt *ep)
36 struct scif_endpt_rma_info *rma = &ep->rma_info;
38 mutex_init(&rma->rma_lock);
39 init_iova_domain(&rma->iovad, PAGE_SIZE, SCIF_IOVA_START_PFN,
41 spin_lock_init(&rma->tc_lock);
42 mutex_init(&rma->mmn_lock);
43 INIT_LIST_HEAD(&rma->reg_list);
44 INIT_LIST_HEAD(&rma->remote_reg_list);
45 atomic_set(&rma->tw_refcount, 0);
46 atomic_set(&rma->tcw_refcount, 0);
47 atomic_set(&rma->tcw_total_pages, 0);
48 atomic_set(&rma->fence_refcount, 0);
50 rma->async_list_del = 0;
52 INIT_LIST_HEAD(&rma->mmn_list);
53 INIT_LIST_HEAD(&rma->vma_list);
54 init_waitqueue_head(&rma->markwq);
58 * scif_rma_ep_can_uninit:
61 * Returns 1 if an endpoint can be uninitialized and 0 otherwise.
63 int scif_rma_ep_can_uninit(struct scif_endpt *ep)
67 mutex_lock(&ep->rma_info.rma_lock);
68 /* Destroy RMA Info only if both lists are empty */
69 if (list_empty(&ep->rma_info.reg_list) &&
70 list_empty(&ep->rma_info.remote_reg_list) &&
71 list_empty(&ep->rma_info.mmn_list) &&
72 !atomic_read(&ep->rma_info.tw_refcount) &&
73 !atomic_read(&ep->rma_info.tcw_refcount) &&
74 !atomic_read(&ep->rma_info.fence_refcount))
76 mutex_unlock(&ep->rma_info.rma_lock);
81 * scif_create_pinned_pages:
82 * @nr_pages: number of pages in window
83 * @prot: read/write protection
85 * Allocate and prepare a set of pinned pages.
87 static struct scif_pinned_pages *
88 scif_create_pinned_pages(int nr_pages, int prot)
90 struct scif_pinned_pages *pin;
93 pin = scif_zalloc(sizeof(*pin));
97 pin->pages = scif_zalloc(nr_pages * sizeof(*pin->pages));
99 goto error_free_pinned_pages;
102 pin->magic = SCIFEP_MAGIC;
105 error_free_pinned_pages:
106 scif_free(pin, sizeof(*pin));
112 * scif_destroy_pinned_pages:
113 * @pin: A set of pinned pages.
115 * Deallocate resources for pinned pages.
117 static int scif_destroy_pinned_pages(struct scif_pinned_pages *pin)
120 int writeable = pin->prot & SCIF_PROT_WRITE;
121 int kernel = SCIF_MAP_KERNEL & pin->map_flags;
123 for (j = 0; j < pin->nr_pages; j++) {
124 if (pin->pages[j] && !kernel) {
126 SetPageDirty(pin->pages[j]);
127 put_page(pin->pages[j]);
131 scif_free(pin->pages,
132 pin->nr_pages * sizeof(*pin->pages));
133 scif_free(pin, sizeof(*pin));
138 * scif_create_window:
140 * @nr_pages: number of pages
141 * @offset: registration offset
142 * @temp: true if a temporary window is being created
144 * Allocate and prepare a self registration window.
146 struct scif_window *scif_create_window(struct scif_endpt *ep, int nr_pages,
147 s64 offset, bool temp)
149 struct scif_window *window;
152 window = scif_zalloc(sizeof(*window));
156 window->dma_addr = scif_zalloc(nr_pages * sizeof(*window->dma_addr));
157 if (!window->dma_addr)
158 goto error_free_window;
160 window->num_pages = scif_zalloc(nr_pages * sizeof(*window->num_pages));
161 if (!window->num_pages)
162 goto error_free_window;
164 window->offset = offset;
165 window->ep = (u64)ep;
166 window->magic = SCIFEP_MAGIC;
167 window->reg_state = OP_IDLE;
168 init_waitqueue_head(&window->regwq);
169 window->unreg_state = OP_IDLE;
170 init_waitqueue_head(&window->unregwq);
171 INIT_LIST_HEAD(&window->list);
172 window->type = SCIF_WINDOW_SELF;
177 scif_free(window->dma_addr,
178 nr_pages * sizeof(*window->dma_addr));
179 scif_free(window, sizeof(*window));
185 * scif_destroy_incomplete_window:
187 * @window: registration window
189 * Deallocate resources for self window.
191 static void scif_destroy_incomplete_window(struct scif_endpt *ep,
192 struct scif_window *window)
195 int nr_pages = window->nr_pages;
196 struct scif_allocmsg *alloc = &window->alloc_handle;
200 /* Wait for a SCIF_ALLOC_GNT/REJ message */
201 err = wait_event_timeout(alloc->allocwq,
202 alloc->state != OP_IN_PROGRESS,
203 SCIF_NODE_ALIVE_TIMEOUT);
204 if (!err && scifdev_alive(ep))
207 mutex_lock(&ep->rma_info.rma_lock);
208 if (alloc->state == OP_COMPLETED) {
209 msg.uop = SCIF_FREE_VIRT;
211 msg.payload[0] = ep->remote_ep;
212 msg.payload[1] = window->alloc_handle.vaddr;
213 msg.payload[2] = (u64)window;
214 msg.payload[3] = SCIF_REGISTER;
215 _scif_nodeqp_send(ep->remote_dev, &msg);
217 mutex_unlock(&ep->rma_info.rma_lock);
219 scif_free_window_offset(ep, window, window->offset);
220 scif_free(window->dma_addr, nr_pages * sizeof(*window->dma_addr));
221 scif_free(window->num_pages, nr_pages * sizeof(*window->num_pages));
222 scif_free(window, sizeof(*window));
227 * @remote_dev: SCIF remote device
228 * @window: registration window
230 * Delete any DMA mappings created for a registered self window
232 void scif_unmap_window(struct scif_dev *remote_dev, struct scif_window *window)
236 if (scif_is_iommu_enabled() && !scifdev_self(remote_dev)) {
238 dma_unmap_sg(&remote_dev->sdev->dev,
239 window->st->sgl, window->st->nents,
241 sg_free_table(window->st);
246 for (j = 0; j < window->nr_contig_chunks; j++) {
247 if (window->dma_addr[j]) {
248 scif_unmap_single(window->dma_addr[j],
250 window->num_pages[j] <<
252 window->dma_addr[j] = 0x0;
258 static inline struct mm_struct *__scif_acquire_mm(void)
260 if (scif_ulimit_check)
261 return get_task_mm(current);
265 static inline void __scif_release_mm(struct mm_struct *mm)
272 __scif_dec_pinned_vm_lock(struct mm_struct *mm,
273 int nr_pages, bool try_lock)
275 if (!mm || !nr_pages || !scif_ulimit_check)
278 if (!down_write_trylock(&mm->mmap_sem)) {
279 dev_err(scif_info.mdev.this_device,
280 "%s %d err\n", __func__, __LINE__);
284 down_write(&mm->mmap_sem);
286 mm->pinned_vm -= nr_pages;
287 up_write(&mm->mmap_sem);
291 static inline int __scif_check_inc_pinned_vm(struct mm_struct *mm,
294 unsigned long locked, lock_limit;
296 if (!mm || !nr_pages || !scif_ulimit_check)
300 locked += mm->pinned_vm;
301 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
302 if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
303 dev_err(scif_info.mdev.this_device,
304 "locked(%lu) > lock_limit(%lu)\n",
308 mm->pinned_vm = locked;
313 * scif_destroy_window:
315 * @window: registration window
317 * Deallocate resources for self window.
319 int scif_destroy_window(struct scif_endpt *ep, struct scif_window *window)
322 struct scif_pinned_pages *pinned_pages = window->pinned_pages;
323 int nr_pages = window->nr_pages;
326 if (!window->temp && window->mm) {
327 __scif_dec_pinned_vm_lock(window->mm, window->nr_pages, 0);
328 __scif_release_mm(window->mm);
332 scif_free_window_offset(ep, window, window->offset);
333 scif_unmap_window(ep->remote_dev, window);
335 * Decrement references for this set of pinned pages from
338 j = atomic_sub_return(1, &pinned_pages->ref_count);
340 dev_err(scif_info.mdev.this_device,
341 "%s %d incorrect ref count %d\n",
342 __func__, __LINE__, j);
344 * If the ref count for pinned_pages is zero then someone
345 * has already called scif_unpin_pages() for it and we should
346 * destroy the page cache.
349 scif_destroy_pinned_pages(window->pinned_pages);
350 scif_free(window->dma_addr, nr_pages * sizeof(*window->dma_addr));
351 scif_free(window->num_pages, nr_pages * sizeof(*window->num_pages));
353 scif_free(window, sizeof(*window));
358 * scif_create_remote_lookup:
359 * @remote_dev: SCIF remote device
360 * @window: remote window
362 * Allocate and prepare lookup entries for the remote
363 * end to copy over the physical addresses.
364 * Returns 0 on success and appropriate errno on failure.
366 static int scif_create_remote_lookup(struct scif_dev *remote_dev,
367 struct scif_window *window)
370 int nr_pages = window->nr_pages;
371 bool vmalloc_dma_phys, vmalloc_num_pages;
375 err = scif_map_single(&window->mapped_offset,
376 window, remote_dev, sizeof(*window));
380 /* Compute the number of lookup entries. 21 == 2MB Shift */
381 window->nr_lookup = ALIGN(nr_pages * PAGE_SIZE,
382 ((2) * 1024 * 1024)) >> 21;
384 window->dma_addr_lookup.lookup =
385 scif_alloc_coherent(&window->dma_addr_lookup.offset,
386 remote_dev, window->nr_lookup *
387 sizeof(*window->dma_addr_lookup.lookup),
388 GFP_KERNEL | __GFP_ZERO);
389 if (!window->dma_addr_lookup.lookup) {
394 window->num_pages_lookup.lookup =
395 scif_alloc_coherent(&window->num_pages_lookup.offset,
396 remote_dev, window->nr_lookup *
397 sizeof(*window->num_pages_lookup.lookup),
398 GFP_KERNEL | __GFP_ZERO);
399 if (!window->num_pages_lookup.lookup) {
404 vmalloc_dma_phys = is_vmalloc_addr(&window->dma_addr[0]);
405 vmalloc_num_pages = is_vmalloc_addr(&window->num_pages[0]);
407 /* Now map each of the pages containing physical addresses */
408 for (i = 0, j = 0; i < nr_pages; i += SCIF_NR_ADDR_IN_PAGE, j++) {
409 err = scif_map_page(&window->dma_addr_lookup.lookup[j],
411 vmalloc_to_page(&window->dma_addr[i]) :
412 virt_to_page(&window->dma_addr[i]),
416 err = scif_map_page(&window->num_pages_lookup.lookup[j],
418 vmalloc_to_page(&window->num_pages[i]) :
419 virt_to_page(&window->num_pages[i]),
430 * scif_destroy_remote_lookup:
431 * @remote_dev: SCIF remote device
432 * @window: remote window
434 * Destroy lookup entries used for the remote
435 * end to copy over the physical addresses.
437 static void scif_destroy_remote_lookup(struct scif_dev *remote_dev,
438 struct scif_window *window)
442 if (window->nr_lookup) {
443 struct scif_rma_lookup *lup = &window->dma_addr_lookup;
444 struct scif_rma_lookup *npup = &window->num_pages_lookup;
446 for (i = 0, j = 0; i < window->nr_pages;
447 i += SCIF_NR_ADDR_IN_PAGE, j++) {
448 if (lup->lookup && lup->lookup[j])
449 scif_unmap_single(lup->lookup[j],
452 if (npup->lookup && npup->lookup[j])
453 scif_unmap_single(npup->lookup[j],
458 scif_free_coherent(lup->lookup, lup->offset,
459 remote_dev, window->nr_lookup *
460 sizeof(*lup->lookup));
462 scif_free_coherent(npup->lookup, npup->offset,
463 remote_dev, window->nr_lookup *
464 sizeof(*npup->lookup));
465 if (window->mapped_offset)
466 scif_unmap_single(window->mapped_offset,
467 remote_dev, sizeof(*window));
468 window->nr_lookup = 0;
473 * scif_create_remote_window:
475 * @nr_pages: number of pages in window
477 * Allocate and prepare a remote registration window.
479 static struct scif_window *
480 scif_create_remote_window(struct scif_dev *scifdev, int nr_pages)
482 struct scif_window *window;
485 window = scif_zalloc(sizeof(*window));
489 window->magic = SCIFEP_MAGIC;
490 window->nr_pages = nr_pages;
492 window->dma_addr = scif_zalloc(nr_pages * sizeof(*window->dma_addr));
493 if (!window->dma_addr)
496 window->num_pages = scif_zalloc(nr_pages *
497 sizeof(*window->num_pages));
498 if (!window->num_pages)
501 if (scif_create_remote_lookup(scifdev, window))
504 window->type = SCIF_WINDOW_PEER;
505 window->unreg_state = OP_IDLE;
506 INIT_LIST_HEAD(&window->list);
509 scif_destroy_remote_window(window);
515 * scif_destroy_remote_window:
517 * @window: remote registration window
519 * Deallocate resources for remote window.
522 scif_destroy_remote_window(struct scif_window *window)
524 scif_free(window->dma_addr, window->nr_pages *
525 sizeof(*window->dma_addr));
526 scif_free(window->num_pages, window->nr_pages *
527 sizeof(*window->num_pages));
529 scif_free(window, sizeof(*window));
533 * scif_iommu_map: create DMA mappings if the IOMMU is enabled
534 * @remote_dev: SCIF remote device
535 * @window: remote registration window
537 * Map the physical pages using dma_map_sg(..) and then detect the number
538 * of contiguous DMA mappings allocated
540 static int scif_iommu_map(struct scif_dev *remote_dev,
541 struct scif_window *window)
543 struct scatterlist *sg;
545 scif_pinned_pages_t pin = window->pinned_pages;
547 window->st = kzalloc(sizeof(*window->st), GFP_KERNEL);
551 err = sg_alloc_table(window->st, window->nr_pages, GFP_KERNEL);
555 for_each_sg(window->st->sgl, sg, window->st->nents, i)
556 sg_set_page(sg, pin->pages[i], PAGE_SIZE, 0x0);
558 err = dma_map_sg(&remote_dev->sdev->dev, window->st->sgl,
559 window->st->nents, DMA_BIDIRECTIONAL);
562 /* Detect contiguous ranges of DMA mappings */
563 sg = window->st->sgl;
564 for (i = 0; sg; i++) {
567 window->dma_addr[i] = sg_dma_address(sg);
568 window->num_pages[i] = sg_dma_len(sg) >> PAGE_SHIFT;
569 last_da = sg_dma_address(sg) + sg_dma_len(sg);
570 while ((sg = sg_next(sg)) && sg_dma_address(sg) == last_da) {
571 window->num_pages[i] +=
572 (sg_dma_len(sg) >> PAGE_SHIFT);
573 last_da = window->dma_addr[i] +
576 window->nr_contig_chunks++;
583 * @remote_dev: SCIF remote device
584 * @window: self registration window
586 * Map pages of a window into the aperture/PCI.
587 * Also determine addresses required for DMA.
590 scif_map_window(struct scif_dev *remote_dev, struct scif_window *window)
592 int i, j, k, err = 0, nr_contig_pages;
593 scif_pinned_pages_t pin;
594 phys_addr_t phys_prev, phys_curr;
598 pin = window->pinned_pages;
600 if (intel_iommu_enabled && !scifdev_self(remote_dev))
601 return scif_iommu_map(remote_dev, window);
603 for (i = 0, j = 0; i < window->nr_pages; i += nr_contig_pages, j++) {
604 phys_prev = page_to_phys(pin->pages[i]);
607 /* Detect physically contiguous chunks */
608 for (k = i + 1; k < window->nr_pages; k++) {
609 phys_curr = page_to_phys(pin->pages[k]);
610 if (phys_curr != (phys_prev + PAGE_SIZE))
612 phys_prev = phys_curr;
615 window->num_pages[j] = nr_contig_pages;
616 window->nr_contig_chunks++;
617 if (scif_is_mgmt_node()) {
619 * Management node has to deal with SMPT on X100 and
620 * hence the DMA mapping is required
622 err = scif_map_single(&window->dma_addr[j],
623 phys_to_virt(page_to_phys(
626 nr_contig_pages << PAGE_SHIFT);
630 window->dma_addr[j] = page_to_phys(pin->pages[i]);
637 * scif_send_scif_unregister:
639 * @window: self registration window
641 * Send a SCIF_UNREGISTER message.
643 static int scif_send_scif_unregister(struct scif_endpt *ep,
644 struct scif_window *window)
648 msg.uop = SCIF_UNREGISTER;
650 msg.payload[0] = window->alloc_handle.vaddr;
651 msg.payload[1] = (u64)window;
652 return scif_nodeqp_send(ep->remote_dev, &msg);
656 * scif_unregister_window:
657 * @window: self registration window
659 * Send an unregistration request and wait for a response.
661 int scif_unregister_window(struct scif_window *window)
664 struct scif_endpt *ep = (struct scif_endpt *)window->ep;
665 bool send_msg = false;
668 switch (window->unreg_state) {
671 window->unreg_state = OP_IN_PROGRESS;
677 scif_get_window(window, 1);
678 mutex_unlock(&ep->rma_info.rma_lock);
680 err = scif_send_scif_unregister(ep, window);
682 window->unreg_state = OP_COMPLETED;
686 /* Return ENXIO since unregistration is in progress */
687 mutex_lock(&ep->rma_info.rma_lock);
691 /* Wait for a SCIF_UNREGISTER_(N)ACK message */
692 err = wait_event_timeout(window->unregwq,
693 window->unreg_state != OP_IN_PROGRESS,
694 SCIF_NODE_ALIVE_TIMEOUT);
695 if (!err && scifdev_alive(ep))
699 window->unreg_state = OP_COMPLETED;
700 dev_err(scif_info.mdev.this_device,
701 "%s %d err %d\n", __func__, __LINE__, err);
706 mutex_lock(&ep->rma_info.rma_lock);
707 scif_put_window(window, 1);
712 if (!scifdev_alive(ep)) {
714 window->unreg_state = OP_COMPLETED;
724 if (window->unreg_state == OP_COMPLETED && window->ref_count)
725 scif_put_window(window, window->nr_pages);
727 if (!window->ref_count) {
728 atomic_inc(&ep->rma_info.tw_refcount);
729 list_del_init(&window->list);
730 scif_free_window_offset(ep, window, window->offset);
731 mutex_unlock(&ep->rma_info.rma_lock);
732 if ((!!(window->pinned_pages->map_flags & SCIF_MAP_KERNEL)) &&
734 scif_drain_dma_intr(ep->remote_dev->sdev,
735 ep->rma_info.dma_chan);
737 if (!__scif_dec_pinned_vm_lock(window->mm,
738 window->nr_pages, 1)) {
739 __scif_release_mm(window->mm);
743 scif_queue_for_cleanup(window, &scif_info.rma);
744 mutex_lock(&ep->rma_info.rma_lock);
750 * scif_send_alloc_request:
752 * @window: self registration window
754 * Send a remote window allocation request
756 static int scif_send_alloc_request(struct scif_endpt *ep,
757 struct scif_window *window)
760 struct scif_allocmsg *alloc = &window->alloc_handle;
762 /* Set up the Alloc Handle */
763 alloc->state = OP_IN_PROGRESS;
764 init_waitqueue_head(&alloc->allocwq);
766 /* Send out an allocation request */
767 msg.uop = SCIF_ALLOC_REQ;
768 msg.payload[1] = window->nr_pages;
769 msg.payload[2] = (u64)&window->alloc_handle;
770 return _scif_nodeqp_send(ep->remote_dev, &msg);
774 * scif_prep_remote_window:
776 * @window: self registration window
778 * Send a remote window allocation request, wait for an allocation response,
779 * and prepares the remote window by copying over the page lists
781 static int scif_prep_remote_window(struct scif_endpt *ep,
782 struct scif_window *window)
785 struct scif_window *remote_window;
786 struct scif_allocmsg *alloc = &window->alloc_handle;
787 dma_addr_t *dma_phys_lookup, *tmp, *num_pages_lookup, *tmp1;
789 int nr_contig_chunks, loop_nr_contig_chunks;
790 int remaining_nr_contig_chunks, nr_lookup;
793 map_err = scif_map_window(ep->remote_dev, window);
795 dev_err(&ep->remote_dev->sdev->dev,
796 "%s %d map_err %d\n", __func__, __LINE__, map_err);
797 remaining_nr_contig_chunks = window->nr_contig_chunks;
798 nr_contig_chunks = window->nr_contig_chunks;
800 /* Wait for a SCIF_ALLOC_GNT/REJ message */
801 err = wait_event_timeout(alloc->allocwq,
802 alloc->state != OP_IN_PROGRESS,
803 SCIF_NODE_ALIVE_TIMEOUT);
804 mutex_lock(&ep->rma_info.rma_lock);
805 /* Synchronize with the thread waking up allocwq */
806 mutex_unlock(&ep->rma_info.rma_lock);
807 if (!err && scifdev_alive(ep))
818 /* Bail out. The remote end rejected this request */
819 if (alloc->state == OP_FAILED)
823 dev_err(&ep->remote_dev->sdev->dev,
824 "%s %d err %d\n", __func__, __LINE__, map_err);
825 msg.uop = SCIF_FREE_VIRT;
827 msg.payload[0] = ep->remote_ep;
828 msg.payload[1] = window->alloc_handle.vaddr;
829 msg.payload[2] = (u64)window;
830 msg.payload[3] = SCIF_REGISTER;
831 spin_lock(&ep->lock);
832 if (ep->state == SCIFEP_CONNECTED)
833 err = _scif_nodeqp_send(ep->remote_dev, &msg);
836 spin_unlock(&ep->lock);
840 remote_window = scif_ioremap(alloc->phys_addr, sizeof(*window),
843 /* Compute the number of lookup entries. 21 == 2MB Shift */
844 nr_lookup = ALIGN(nr_contig_chunks, SCIF_NR_ADDR_IN_PAGE)
845 >> ilog2(SCIF_NR_ADDR_IN_PAGE);
848 scif_ioremap(remote_window->dma_addr_lookup.offset,
850 sizeof(*remote_window->dma_addr_lookup.lookup),
853 scif_ioremap(remote_window->num_pages_lookup.offset,
855 sizeof(*remote_window->num_pages_lookup.lookup),
858 while (remaining_nr_contig_chunks) {
859 loop_nr_contig_chunks = min_t(int, remaining_nr_contig_chunks,
860 (int)SCIF_NR_ADDR_IN_PAGE);
861 /* #1/2 - Copy physical addresses over to the remote side */
863 /* #2/2 - Copy DMA addresses (addresses that are fed into the
864 * DMA engine) We transfer bus addresses which are then
865 * converted into a MIC physical address on the remote
866 * side if it is a MIC, if the remote node is a mgmt node we
867 * transfer the MIC physical address
869 tmp = scif_ioremap(dma_phys_lookup[j],
870 loop_nr_contig_chunks *
871 sizeof(*window->dma_addr),
873 tmp1 = scif_ioremap(num_pages_lookup[j],
874 loop_nr_contig_chunks *
875 sizeof(*window->num_pages),
877 if (scif_is_mgmt_node()) {
878 memcpy_toio((void __force __iomem *)tmp,
879 &window->dma_addr[i], loop_nr_contig_chunks
880 * sizeof(*window->dma_addr));
881 memcpy_toio((void __force __iomem *)tmp1,
882 &window->num_pages[i], loop_nr_contig_chunks
883 * sizeof(*window->num_pages));
885 if (scifdev_is_p2p(ep->remote_dev)) {
887 * add remote node's base address for this node
888 * to convert it into a MIC address
893 for (m = 0; m < loop_nr_contig_chunks; m++) {
894 dma_addr = window->dma_addr[i + m] +
895 ep->remote_dev->base_addr;
897 (void __force __iomem *)&tmp[m]);
899 memcpy_toio((void __force __iomem *)tmp1,
900 &window->num_pages[i],
901 loop_nr_contig_chunks
902 * sizeof(*window->num_pages));
904 /* Mgmt node or loopback - transfer DMA
905 * addresses as is, this is the same as a
906 * MIC physical address (we use the dma_addr
907 * and not the phys_addr array since the
908 * phys_addr is only setup if there is a mmap()
909 * request from the mgmt node)
911 memcpy_toio((void __force __iomem *)tmp,
912 &window->dma_addr[i],
913 loop_nr_contig_chunks *
914 sizeof(*window->dma_addr));
915 memcpy_toio((void __force __iomem *)tmp1,
916 &window->num_pages[i],
917 loop_nr_contig_chunks *
918 sizeof(*window->num_pages));
921 remaining_nr_contig_chunks -= loop_nr_contig_chunks;
922 i += loop_nr_contig_chunks;
924 scif_iounmap(tmp, loop_nr_contig_chunks *
925 sizeof(*window->dma_addr), ep->remote_dev);
926 scif_iounmap(tmp1, loop_nr_contig_chunks *
927 sizeof(*window->num_pages), ep->remote_dev);
930 /* Prepare the remote window for the peer */
931 remote_window->peer_window = (u64)window;
932 remote_window->offset = window->offset;
933 remote_window->prot = window->prot;
934 remote_window->nr_contig_chunks = nr_contig_chunks;
935 remote_window->ep = ep->remote_ep;
936 scif_iounmap(num_pages_lookup,
938 sizeof(*remote_window->num_pages_lookup.lookup),
940 scif_iounmap(dma_phys_lookup,
942 sizeof(*remote_window->dma_addr_lookup.lookup),
944 scif_iounmap(remote_window, sizeof(*remote_window), ep->remote_dev);
945 window->peer_window = alloc->vaddr;
950 * scif_send_scif_register:
952 * @window: self registration window
954 * Send a SCIF_REGISTER message if EP is connected and wait for a
955 * SCIF_REGISTER_(N)ACK message else send a SCIF_FREE_VIRT
956 * message so that the peer can free its remote window allocated earlier.
958 static int scif_send_scif_register(struct scif_endpt *ep,
959 struct scif_window *window)
965 msg.payload[0] = ep->remote_ep;
966 msg.payload[1] = window->alloc_handle.vaddr;
967 msg.payload[2] = (u64)window;
968 spin_lock(&ep->lock);
969 if (ep->state == SCIFEP_CONNECTED) {
970 msg.uop = SCIF_REGISTER;
971 window->reg_state = OP_IN_PROGRESS;
972 err = _scif_nodeqp_send(ep->remote_dev, &msg);
973 spin_unlock(&ep->lock);
976 /* Wait for a SCIF_REGISTER_(N)ACK message */
977 err = wait_event_timeout(window->regwq,
980 SCIF_NODE_ALIVE_TIMEOUT);
981 if (!err && scifdev_alive(ep))
983 err = !err ? -ENODEV : 0;
984 if (window->reg_state == OP_FAILED)
988 msg.uop = SCIF_FREE_VIRT;
989 msg.payload[3] = SCIF_REGISTER;
990 err = _scif_nodeqp_send(ep->remote_dev, &msg);
991 spin_unlock(&ep->lock);
999 * scif_get_window_offset:
1000 * @ep: end point descriptor
1002 * @offset: offset hint
1003 * @num_pages: number of pages
1004 * @out_offset: computed offset returned by reference.
1006 * Compute/Claim a new offset for this EP.
1008 int scif_get_window_offset(struct scif_endpt *ep, int flags, s64 offset,
1009 int num_pages, s64 *out_offset)
1012 struct iova *iova_ptr;
1015 if (flags & SCIF_MAP_FIXED) {
1016 page_index = SCIF_IOVA_PFN(offset);
1017 iova_ptr = reserve_iova(&ep->rma_info.iovad, page_index,
1018 page_index + num_pages - 1);
1022 iova_ptr = alloc_iova(&ep->rma_info.iovad, num_pages,
1023 SCIF_DMA_63BIT_PFN - 1, 0);
1028 *out_offset = (iova_ptr->pfn_lo) << PAGE_SHIFT;
1033 * scif_free_window_offset:
1034 * @ep: end point descriptor
1035 * @window: registration window
1036 * @offset: Offset to be freed
1038 * Free offset for this EP. The callee is supposed to grab
1039 * the RMA mutex before calling this API.
1041 void scif_free_window_offset(struct scif_endpt *ep,
1042 struct scif_window *window, s64 offset)
1044 if ((window && !window->offset_freed) || !window) {
1045 free_iova(&ep->rma_info.iovad, offset >> PAGE_SHIFT);
1047 window->offset_freed = true;
1052 * scif_alloc_req: Respond to SCIF_ALLOC_REQ interrupt message
1053 * @msg: Interrupt message
1055 * Remote side is requesting a memory allocation.
1057 void scif_alloc_req(struct scif_dev *scifdev, struct scifmsg *msg)
1060 struct scif_window *window = NULL;
1061 int nr_pages = msg->payload[1];
1063 window = scif_create_remote_window(scifdev, nr_pages);
1069 /* The peer's allocation request is granted */
1070 msg->uop = SCIF_ALLOC_GNT;
1071 msg->payload[0] = (u64)window;
1072 msg->payload[1] = window->mapped_offset;
1073 err = scif_nodeqp_send(scifdev, msg);
1075 scif_destroy_remote_window(window);
1078 /* The peer's allocation request is rejected */
1079 dev_err(&scifdev->sdev->dev,
1080 "%s %d error %d alloc_ptr %p nr_pages 0x%x\n",
1081 __func__, __LINE__, err, window, nr_pages);
1082 msg->uop = SCIF_ALLOC_REJ;
1083 scif_nodeqp_send(scifdev, msg);
1087 * scif_alloc_gnt_rej: Respond to SCIF_ALLOC_GNT/REJ interrupt message
1088 * @msg: Interrupt message
1090 * Remote side responded to a memory allocation.
1092 void scif_alloc_gnt_rej(struct scif_dev *scifdev, struct scifmsg *msg)
1094 struct scif_allocmsg *handle = (struct scif_allocmsg *)msg->payload[2];
1095 struct scif_window *window = container_of(handle, struct scif_window,
1097 struct scif_endpt *ep = (struct scif_endpt *)window->ep;
1099 mutex_lock(&ep->rma_info.rma_lock);
1100 handle->vaddr = msg->payload[0];
1101 handle->phys_addr = msg->payload[1];
1102 if (msg->uop == SCIF_ALLOC_GNT)
1103 handle->state = OP_COMPLETED;
1105 handle->state = OP_FAILED;
1106 wake_up(&handle->allocwq);
1107 mutex_unlock(&ep->rma_info.rma_lock);
1111 * scif_free_virt: Respond to SCIF_FREE_VIRT interrupt message
1112 * @msg: Interrupt message
1114 * Free up memory kmalloc'd earlier.
1116 void scif_free_virt(struct scif_dev *scifdev, struct scifmsg *msg)
1118 struct scif_window *window = (struct scif_window *)msg->payload[1];
1120 scif_destroy_remote_window(window);
1124 scif_fixup_aper_base(struct scif_dev *dev, struct scif_window *window)
1127 struct scif_hw_dev *sdev = dev->sdev;
1128 phys_addr_t apt_base = 0;
1131 * Add the aperture base if the DMA address is not card relative
1132 * since the DMA addresses need to be an offset into the bar
1134 if (!scifdev_self(dev) && window->type == SCIF_WINDOW_PEER &&
1135 sdev->aper && !sdev->card_rel_da)
1136 apt_base = sdev->aper->pa;
1140 for (j = 0; j < window->nr_contig_chunks; j++) {
1141 if (window->num_pages[j])
1142 window->dma_addr[j] += apt_base;
1149 * scif_recv_reg: Respond to SCIF_REGISTER interrupt message
1150 * @msg: Interrupt message
1152 * Update remote window list with a new registered window.
1154 void scif_recv_reg(struct scif_dev *scifdev, struct scifmsg *msg)
1156 struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0];
1157 struct scif_window *window =
1158 (struct scif_window *)msg->payload[1];
1160 mutex_lock(&ep->rma_info.rma_lock);
1161 spin_lock(&ep->lock);
1162 if (ep->state == SCIFEP_CONNECTED) {
1163 msg->uop = SCIF_REGISTER_ACK;
1164 scif_nodeqp_send(ep->remote_dev, msg);
1165 scif_fixup_aper_base(ep->remote_dev, window);
1166 /* No further failures expected. Insert new window */
1167 scif_insert_window(window, &ep->rma_info.remote_reg_list);
1169 msg->uop = SCIF_REGISTER_NACK;
1170 scif_nodeqp_send(ep->remote_dev, msg);
1172 spin_unlock(&ep->lock);
1173 mutex_unlock(&ep->rma_info.rma_lock);
1174 /* free up any lookup resources now that page lists are transferred */
1175 scif_destroy_remote_lookup(ep->remote_dev, window);
1177 * We could not insert the window but we need to
1178 * destroy the window.
1180 if (msg->uop == SCIF_REGISTER_NACK)
1181 scif_destroy_remote_window(window);
1185 * scif_recv_unreg: Respond to SCIF_UNREGISTER interrupt message
1186 * @msg: Interrupt message
1188 * Remove window from remote registration list;
1190 void scif_recv_unreg(struct scif_dev *scifdev, struct scifmsg *msg)
1192 struct scif_rma_req req;
1193 struct scif_window *window = NULL;
1194 struct scif_window *recv_window =
1195 (struct scif_window *)msg->payload[0];
1196 struct scif_endpt *ep;
1199 ep = (struct scif_endpt *)recv_window->ep;
1200 req.out_window = &window;
1201 req.offset = recv_window->offset;
1203 req.nr_bytes = recv_window->nr_pages << PAGE_SHIFT;
1204 req.type = SCIF_WINDOW_FULL;
1205 req.head = &ep->rma_info.remote_reg_list;
1206 msg->payload[0] = ep->remote_ep;
1208 mutex_lock(&ep->rma_info.rma_lock);
1209 /* Does a valid window exist? */
1210 if (scif_query_window(&req)) {
1211 dev_err(&scifdev->sdev->dev,
1212 "%s %d -ENXIO\n", __func__, __LINE__);
1213 msg->uop = SCIF_UNREGISTER_ACK;
1217 if (window->ref_count)
1218 scif_put_window(window, window->nr_pages);
1220 dev_err(&scifdev->sdev->dev,
1221 "%s %d ref count should be +ve\n",
1222 __func__, __LINE__);
1223 window->unreg_state = OP_COMPLETED;
1224 if (!window->ref_count) {
1225 msg->uop = SCIF_UNREGISTER_ACK;
1226 atomic_inc(&ep->rma_info.tw_refcount);
1227 ep->rma_info.async_list_del = 1;
1228 list_del_init(&window->list);
1231 /* NACK! There are valid references to this window */
1232 msg->uop = SCIF_UNREGISTER_NACK;
1235 /* The window did not make its way to the list at all. ACK */
1236 msg->uop = SCIF_UNREGISTER_ACK;
1237 scif_destroy_remote_window(recv_window);
1240 mutex_unlock(&ep->rma_info.rma_lock);
1242 scif_drain_dma_intr(ep->remote_dev->sdev,
1243 ep->rma_info.dma_chan);
1244 scif_nodeqp_send(ep->remote_dev, msg);
1246 scif_queue_for_cleanup(window, &scif_info.rma);
1250 * scif_recv_reg_ack: Respond to SCIF_REGISTER_ACK interrupt message
1251 * @msg: Interrupt message
1253 * Wake up the window waiting to complete registration.
1255 void scif_recv_reg_ack(struct scif_dev *scifdev, struct scifmsg *msg)
1257 struct scif_window *window =
1258 (struct scif_window *)msg->payload[2];
1259 struct scif_endpt *ep = (struct scif_endpt *)window->ep;
1261 mutex_lock(&ep->rma_info.rma_lock);
1262 window->reg_state = OP_COMPLETED;
1263 wake_up(&window->regwq);
1264 mutex_unlock(&ep->rma_info.rma_lock);
1268 * scif_recv_reg_nack: Respond to SCIF_REGISTER_NACK interrupt message
1269 * @msg: Interrupt message
1271 * Wake up the window waiting to inform it that registration
1272 * cannot be completed.
1274 void scif_recv_reg_nack(struct scif_dev *scifdev, struct scifmsg *msg)
1276 struct scif_window *window =
1277 (struct scif_window *)msg->payload[2];
1278 struct scif_endpt *ep = (struct scif_endpt *)window->ep;
1280 mutex_lock(&ep->rma_info.rma_lock);
1281 window->reg_state = OP_FAILED;
1282 wake_up(&window->regwq);
1283 mutex_unlock(&ep->rma_info.rma_lock);
1287 * scif_recv_unreg_ack: Respond to SCIF_UNREGISTER_ACK interrupt message
1288 * @msg: Interrupt message
1290 * Wake up the window waiting to complete unregistration.
1292 void scif_recv_unreg_ack(struct scif_dev *scifdev, struct scifmsg *msg)
1294 struct scif_window *window =
1295 (struct scif_window *)msg->payload[1];
1296 struct scif_endpt *ep = (struct scif_endpt *)window->ep;
1298 mutex_lock(&ep->rma_info.rma_lock);
1299 window->unreg_state = OP_COMPLETED;
1300 wake_up(&window->unregwq);
1301 mutex_unlock(&ep->rma_info.rma_lock);
1305 * scif_recv_unreg_nack: Respond to SCIF_UNREGISTER_NACK interrupt message
1306 * @msg: Interrupt message
1308 * Wake up the window waiting to inform it that unregistration
1309 * cannot be completed immediately.
1311 void scif_recv_unreg_nack(struct scif_dev *scifdev, struct scifmsg *msg)
1313 struct scif_window *window =
1314 (struct scif_window *)msg->payload[1];
1315 struct scif_endpt *ep = (struct scif_endpt *)window->ep;
1317 mutex_lock(&ep->rma_info.rma_lock);
1318 window->unreg_state = OP_FAILED;
1319 wake_up(&window->unregwq);
1320 mutex_unlock(&ep->rma_info.rma_lock);
1323 int __scif_pin_pages(void *addr, size_t len, int *out_prot,
1324 int map_flags, scif_pinned_pages_t *pages)
1326 struct scif_pinned_pages *pinned_pages;
1327 int nr_pages, err = 0, i;
1328 bool vmalloc_addr = false;
1329 bool try_upgrade = false;
1330 int prot = *out_prot;
1332 struct mm_struct *mm = NULL;
1334 /* Unsupported flags */
1335 if (map_flags & ~(SCIF_MAP_KERNEL | SCIF_MAP_ULIMIT))
1337 ulimit = !!(map_flags & SCIF_MAP_ULIMIT);
1339 /* Unsupported protection requested */
1340 if (prot & ~(SCIF_PROT_READ | SCIF_PROT_WRITE))
1343 /* addr/len must be page aligned. len should be non zero */
1345 (ALIGN((u64)addr, PAGE_SIZE) != (u64)addr) ||
1346 (ALIGN((u64)len, PAGE_SIZE) != (u64)len))
1351 nr_pages = len >> PAGE_SHIFT;
1353 /* Allocate a set of pinned pages */
1354 pinned_pages = scif_create_pinned_pages(nr_pages, prot);
1358 if (map_flags & SCIF_MAP_KERNEL) {
1359 if (is_vmalloc_addr(addr))
1360 vmalloc_addr = true;
1362 for (i = 0; i < nr_pages; i++) {
1364 pinned_pages->pages[i] =
1365 vmalloc_to_page(addr + (i * PAGE_SIZE));
1367 pinned_pages->pages[i] =
1368 virt_to_page(addr + (i * PAGE_SIZE));
1370 pinned_pages->nr_pages = nr_pages;
1371 pinned_pages->map_flags = SCIF_MAP_KERNEL;
1374 * SCIF supports registration caching. If a registration has
1375 * been requested with read only permissions, then we try
1376 * to pin the pages with RW permissions so that a subsequent
1377 * transfer with RW permission can hit the cache instead of
1378 * invalidating it. If the upgrade fails with RW then we
1379 * revert back to R permission and retry
1381 if (prot == SCIF_PROT_READ)
1383 prot |= SCIF_PROT_WRITE;
1386 down_write(&mm->mmap_sem);
1388 err = __scif_check_inc_pinned_vm(mm, nr_pages);
1390 up_write(&mm->mmap_sem);
1391 pinned_pages->nr_pages = 0;
1396 pinned_pages->nr_pages = get_user_pages(
1399 (prot & SCIF_PROT_WRITE) ? FOLL_WRITE : 0,
1400 pinned_pages->pages,
1402 up_write(&mm->mmap_sem);
1403 if (nr_pages != pinned_pages->nr_pages) {
1404 if (pinned_pages->nr_pages < 0)
1405 pinned_pages->nr_pages = 0;
1408 __scif_dec_pinned_vm_lock(mm,
1410 /* Roll back any pinned pages */
1411 for (i = 0; i < pinned_pages->nr_pages; i++) {
1412 if (pinned_pages->pages[i])
1414 pinned_pages->pages[i]);
1416 prot &= ~SCIF_PROT_WRITE;
1417 try_upgrade = false;
1421 pinned_pages->map_flags = 0;
1424 if (pinned_pages->nr_pages < nr_pages) {
1430 atomic_set(&pinned_pages->ref_count, 1);
1431 *pages = pinned_pages;
1435 __scif_dec_pinned_vm_lock(mm, nr_pages, 0);
1436 /* Something went wrong! Rollback */
1438 scif_destroy_pinned_pages(pinned_pages);
1440 dev_dbg(scif_info.mdev.this_device,
1441 "%s %d err %d len 0x%lx\n", __func__, __LINE__, err, len);
1445 int scif_pin_pages(void *addr, size_t len, int prot,
1446 int map_flags, scif_pinned_pages_t *pages)
1448 return __scif_pin_pages(addr, len, &prot, map_flags, pages);
1450 EXPORT_SYMBOL_GPL(scif_pin_pages);
1452 int scif_unpin_pages(scif_pinned_pages_t pinned_pages)
1456 if (!pinned_pages || SCIFEP_MAGIC != pinned_pages->magic)
1459 ret = atomic_sub_return(1, &pinned_pages->ref_count);
1461 dev_err(scif_info.mdev.this_device,
1462 "%s %d scif_unpin_pages called without pinning? rc %d\n",
1463 __func__, __LINE__, ret);
1467 * Destroy the window if the ref count for this set of pinned
1468 * pages has dropped to zero. If it is positive then there is
1469 * a valid registered window which is backed by these pages and
1470 * it will be destroyed once all such windows are unregistered.
1473 err = scif_destroy_pinned_pages(pinned_pages);
1477 EXPORT_SYMBOL_GPL(scif_unpin_pages);
1480 scif_insert_local_window(struct scif_window *window, struct scif_endpt *ep)
1482 mutex_lock(&ep->rma_info.rma_lock);
1483 scif_insert_window(window, &ep->rma_info.reg_list);
1484 mutex_unlock(&ep->rma_info.rma_lock);
1487 off_t scif_register_pinned_pages(scif_epd_t epd,
1488 scif_pinned_pages_t pinned_pages,
1489 off_t offset, int map_flags)
1491 struct scif_endpt *ep = (struct scif_endpt *)epd;
1492 s64 computed_offset;
1493 struct scif_window *window;
1496 struct device *spdev;
1498 /* Unsupported flags */
1499 if (map_flags & ~SCIF_MAP_FIXED)
1502 len = pinned_pages->nr_pages << PAGE_SHIFT;
1505 * Offset is not page aligned/negative or offset+len
1506 * wraps around with SCIF_MAP_FIXED.
1508 if ((map_flags & SCIF_MAP_FIXED) &&
1509 ((ALIGN(offset, PAGE_SIZE) != offset) ||
1511 (len > LONG_MAX - offset)))
1516 err = scif_verify_epd(ep);
1520 * It is an error to pass pinned_pages to scif_register_pinned_pages()
1521 * after calling scif_unpin_pages().
1523 if (!atomic_add_unless(&pinned_pages->ref_count, 1, 0))
1526 /* Compute the offset for this registration */
1527 err = scif_get_window_offset(ep, map_flags, offset,
1528 len, &computed_offset);
1530 atomic_sub(1, &pinned_pages->ref_count);
1534 /* Allocate and prepare self registration window */
1535 window = scif_create_window(ep, pinned_pages->nr_pages,
1536 computed_offset, false);
1538 atomic_sub(1, &pinned_pages->ref_count);
1539 scif_free_window_offset(ep, NULL, computed_offset);
1543 window->pinned_pages = pinned_pages;
1544 window->nr_pages = pinned_pages->nr_pages;
1545 window->prot = pinned_pages->prot;
1547 spdev = scif_get_peer_dev(ep->remote_dev);
1548 if (IS_ERR(spdev)) {
1549 err = PTR_ERR(spdev);
1550 scif_destroy_window(ep, window);
1553 err = scif_send_alloc_request(ep, window);
1555 dev_err(&ep->remote_dev->sdev->dev,
1556 "%s %d err %d\n", __func__, __LINE__, err);
1560 /* Prepare the remote registration window */
1561 err = scif_prep_remote_window(ep, window);
1563 dev_err(&ep->remote_dev->sdev->dev,
1564 "%s %d err %d\n", __func__, __LINE__, err);
1568 /* Tell the peer about the new window */
1569 err = scif_send_scif_register(ep, window);
1571 dev_err(&ep->remote_dev->sdev->dev,
1572 "%s %d err %d\n", __func__, __LINE__, err);
1576 scif_put_peer_dev(spdev);
1577 /* No further failures expected. Insert new window */
1578 scif_insert_local_window(window, ep);
1579 return computed_offset;
1581 scif_destroy_window(ep, window);
1582 scif_put_peer_dev(spdev);
1583 dev_err(&ep->remote_dev->sdev->dev,
1584 "%s %d err %d\n", __func__, __LINE__, err);
1587 EXPORT_SYMBOL_GPL(scif_register_pinned_pages);
1589 off_t scif_register(scif_epd_t epd, void *addr, size_t len, off_t offset,
1590 int prot, int map_flags)
1592 scif_pinned_pages_t pinned_pages;
1594 struct scif_endpt *ep = (struct scif_endpt *)epd;
1595 s64 computed_offset;
1596 struct scif_window *window;
1597 struct mm_struct *mm = NULL;
1598 struct device *spdev;
1600 dev_dbg(scif_info.mdev.this_device,
1601 "SCIFAPI register: ep %p addr %p len 0x%lx offset 0x%lx prot 0x%x map_flags 0x%x\n",
1602 epd, addr, len, offset, prot, map_flags);
1603 /* Unsupported flags */
1604 if (map_flags & ~(SCIF_MAP_FIXED | SCIF_MAP_KERNEL))
1608 * Offset is not page aligned/negative or offset+len
1609 * wraps around with SCIF_MAP_FIXED.
1611 if ((map_flags & SCIF_MAP_FIXED) &&
1612 ((ALIGN(offset, PAGE_SIZE) != offset) ||
1614 (len > LONG_MAX - offset)))
1617 /* Unsupported protection requested */
1618 if (prot & ~(SCIF_PROT_READ | SCIF_PROT_WRITE))
1621 /* addr/len must be page aligned. len should be non zero */
1622 if (!len || (ALIGN((u64)addr, PAGE_SIZE) != (u64)addr) ||
1623 (ALIGN(len, PAGE_SIZE) != len))
1628 err = scif_verify_epd(ep);
1632 /* Compute the offset for this registration */
1633 err = scif_get_window_offset(ep, map_flags, offset,
1634 len >> PAGE_SHIFT, &computed_offset);
1638 spdev = scif_get_peer_dev(ep->remote_dev);
1639 if (IS_ERR(spdev)) {
1640 err = PTR_ERR(spdev);
1641 scif_free_window_offset(ep, NULL, computed_offset);
1644 /* Allocate and prepare self registration window */
1645 window = scif_create_window(ep, len >> PAGE_SHIFT,
1646 computed_offset, false);
1648 scif_free_window_offset(ep, NULL, computed_offset);
1649 scif_put_peer_dev(spdev);
1653 window->nr_pages = len >> PAGE_SHIFT;
1655 err = scif_send_alloc_request(ep, window);
1657 scif_destroy_incomplete_window(ep, window);
1658 scif_put_peer_dev(spdev);
1662 if (!(map_flags & SCIF_MAP_KERNEL)) {
1663 mm = __scif_acquire_mm();
1664 map_flags |= SCIF_MAP_ULIMIT;
1666 /* Pin down the pages */
1667 err = __scif_pin_pages(addr, len, &prot,
1668 map_flags & (SCIF_MAP_KERNEL | SCIF_MAP_ULIMIT),
1671 scif_destroy_incomplete_window(ep, window);
1672 __scif_release_mm(mm);
1676 window->pinned_pages = pinned_pages;
1677 window->prot = pinned_pages->prot;
1680 /* Prepare the remote registration window */
1681 err = scif_prep_remote_window(ep, window);
1683 dev_err(&ep->remote_dev->sdev->dev,
1684 "%s %d err %ld\n", __func__, __LINE__, err);
1688 /* Tell the peer about the new window */
1689 err = scif_send_scif_register(ep, window);
1691 dev_err(&ep->remote_dev->sdev->dev,
1692 "%s %d err %ld\n", __func__, __LINE__, err);
1696 scif_put_peer_dev(spdev);
1697 /* No further failures expected. Insert new window */
1698 scif_insert_local_window(window, ep);
1699 dev_dbg(&ep->remote_dev->sdev->dev,
1700 "SCIFAPI register: ep %p addr %p len 0x%lx computed_offset 0x%llx\n",
1701 epd, addr, len, computed_offset);
1702 return computed_offset;
1704 scif_destroy_window(ep, window);
1706 scif_put_peer_dev(spdev);
1707 dev_err(&ep->remote_dev->sdev->dev,
1708 "%s %d err %ld\n", __func__, __LINE__, err);
1711 EXPORT_SYMBOL_GPL(scif_register);
1714 scif_unregister(scif_epd_t epd, off_t offset, size_t len)
1716 struct scif_endpt *ep = (struct scif_endpt *)epd;
1717 struct scif_window *window = NULL;
1718 struct scif_rma_req req;
1720 struct device *spdev;
1722 dev_dbg(scif_info.mdev.this_device,
1723 "SCIFAPI unregister: ep %p offset 0x%lx len 0x%lx\n",
1725 /* len must be page aligned. len should be non zero */
1727 (ALIGN((u64)len, PAGE_SIZE) != (u64)len))
1730 /* Offset is not page aligned or offset+len wraps around */
1731 if ((ALIGN(offset, PAGE_SIZE) != offset) ||
1733 (len > LONG_MAX - offset))
1736 err = scif_verify_epd(ep);
1741 nr_pages = len >> PAGE_SHIFT;
1743 req.out_window = &window;
1744 req.offset = offset;
1747 req.type = SCIF_WINDOW_FULL;
1748 req.head = &ep->rma_info.reg_list;
1750 spdev = scif_get_peer_dev(ep->remote_dev);
1751 if (IS_ERR(spdev)) {
1752 err = PTR_ERR(spdev);
1755 mutex_lock(&ep->rma_info.rma_lock);
1756 /* Does a valid window exist? */
1757 err = scif_query_window(&req);
1759 dev_err(&ep->remote_dev->sdev->dev,
1760 "%s %d err %d\n", __func__, __LINE__, err);
1763 /* Unregister all the windows in this range */
1764 err = scif_rma_list_unregister(window, offset, nr_pages);
1766 dev_err(&ep->remote_dev->sdev->dev,
1767 "%s %d err %d\n", __func__, __LINE__, err);
1769 mutex_unlock(&ep->rma_info.rma_lock);
1770 scif_put_peer_dev(spdev);
1773 EXPORT_SYMBOL_GPL(scif_unregister);