1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/*
3 * Copyright 2020-2021 Advanced Micro Devices, Inc.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 */
23#include <linux/types.h>
24#include <linux/dma-direction.h>
25#include <linux/dma-mapping.h>
26#include <linux/migrate.h>
27#include "amdgpu_sync.h"
28#include "amdgpu_object.h"
29#include "amdgpu_vm.h"
30#include "amdgpu_res_cursor.h"
31#include "kfd_priv.h"
32#include "kfd_svm.h"
33#include "kfd_migrate.h"
34#include "kfd_smi_events.h"
35
36#ifdef dev_fmt
37#undef dev_fmt
38#endif
39#define dev_fmt(fmt) "kfd_migrate: " fmt
40
41static u64
42svm_migrate_direct_mapping_addr(struct amdgpu_device *adev, u64 addr)
43{
44 return addr + amdgpu_ttm_domain_start(adev, TTM_PL_VRAM);
45}
46
47static int
48svm_migrate_gart_map(struct amdgpu_ring *ring, u64 npages,
49 dma_addr_t *addr, u64 *gart_addr, u64 flags)
50{
51 struct amdgpu_device *adev = ring->adev;
52 struct amdgpu_job *job;
53 unsigned int num_dw, num_bytes;
54 struct dma_fence *fence;
55 u64 src_addr, dst_addr;
56 u64 pte_flags;
57 void *cpu_addr;
58 int r;
59
60 /* use gart window 0 */
61 *gart_addr = adev->gmc.gart_start;
62
63 num_dw = ALIGN(adev->mman.buffer_funcs->copy_num_dw, 8);
64 num_bytes = npages * 8;
65
66 r = amdgpu_job_alloc_with_ib(adev, entity: &adev->mman.high_pr,
67 AMDGPU_FENCE_OWNER_UNDEFINED,
68 size: num_dw * 4 + num_bytes,
69 pool_type: AMDGPU_IB_POOL_DELAYED,
70 job: &job,
71 AMDGPU_KERNEL_JOB_ID_KFD_GART_MAP);
72 if (r)
73 return r;
74
75 src_addr = num_dw * 4;
76 src_addr += job->ibs[0].gpu_addr;
77
78 dst_addr = amdgpu_bo_gpu_offset(bo: adev->gart.bo);
79 amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr,
80 dst_addr, num_bytes, 0);
81
82 amdgpu_ring_pad_ib(ring, &job->ibs[0]);
83 WARN_ON(job->ibs[0].length_dw > num_dw);
84
85 pte_flags = AMDGPU_PTE_VALID | AMDGPU_PTE_READABLE;
86 pte_flags |= AMDGPU_PTE_SYSTEM | AMDGPU_PTE_SNOOPED;
87 if (!(flags & KFD_IOCTL_SVM_FLAG_GPU_RO))
88 pte_flags |= AMDGPU_PTE_WRITEABLE;
89 pte_flags |= adev->gart.gart_pte_flags;
90
91 cpu_addr = &job->ibs[0].ptr[num_dw];
92
93 amdgpu_gart_map(adev, offset: 0, pages: npages, dma_addr: addr, flags: pte_flags, dst: cpu_addr);
94 fence = amdgpu_job_submit(job);
95 dma_fence_put(fence);
96
97 return r;
98}
99
100/**
101 * svm_migrate_copy_memory_gart - sdma copy data between ram and vram
102 *
103 * @adev: amdgpu device the sdma ring running
104 * @sys: system DMA pointer to be copied
105 * @vram: vram destination DMA pointer
106 * @npages: number of pages to copy
107 * @direction: enum MIGRATION_COPY_DIR
108 * @mfence: output, sdma fence to signal after sdma is done
109 *
110 * ram address uses GART table continuous entries mapping to ram pages,
111 * vram address uses direct mapping of vram pages, which must have npages
112 * number of continuous pages.
113 * GART update and sdma uses same buf copy function ring, sdma is splited to
114 * multiple GTT_MAX_PAGES transfer, all sdma operations are serialized, wait for
115 * the last sdma finish fence which is returned to check copy memory is done.
116 *
117 * Context: Process context, takes and releases gtt_window_lock
118 *
119 * Return:
120 * 0 - OK, otherwise error code
121 */
122
123static int
124svm_migrate_copy_memory_gart(struct amdgpu_device *adev, dma_addr_t *sys,
125 u64 *vram, u64 npages,
126 enum MIGRATION_COPY_DIR direction,
127 struct dma_fence **mfence)
128{
129 const u64 GTT_MAX_PAGES = AMDGPU_GTT_MAX_TRANSFER_SIZE;
130 struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
131 u64 gart_s, gart_d;
132 struct dma_fence *next;
133 u64 size;
134 int r;
135
136 mutex_lock(&adev->mman.gtt_window_lock);
137
138 while (npages) {
139 size = min(GTT_MAX_PAGES, npages);
140
141 if (direction == FROM_VRAM_TO_RAM) {
142 gart_s = svm_migrate_direct_mapping_addr(adev, addr: *vram);
143 r = svm_migrate_gart_map(ring, npages: size, addr: sys, gart_addr: &gart_d, flags: 0);
144
145 } else if (direction == FROM_RAM_TO_VRAM) {
146 r = svm_migrate_gart_map(ring, npages: size, addr: sys, gart_addr: &gart_s,
147 KFD_IOCTL_SVM_FLAG_GPU_RO);
148 gart_d = svm_migrate_direct_mapping_addr(adev, addr: *vram);
149 }
150 if (r) {
151 dev_err(adev->dev, "fail %d create gart mapping\n", r);
152 goto out_unlock;
153 }
154
155 r = amdgpu_copy_buffer(ring, src_offset: gart_s, dst_offset: gart_d, byte_count: size * PAGE_SIZE,
156 NULL, fence: &next, direct_submit: false, vm_needs_flush: true, copy_flags: 0);
157 if (r) {
158 dev_err(adev->dev, "fail %d to copy memory\n", r);
159 goto out_unlock;
160 }
161
162 dma_fence_put(fence: *mfence);
163 *mfence = next;
164 npages -= size;
165 if (npages) {
166 sys += size;
167 vram += size;
168 }
169 }
170
171out_unlock:
172 mutex_unlock(lock: &adev->mman.gtt_window_lock);
173
174 return r;
175}
176
177/**
178 * svm_migrate_copy_done - wait for memory copy sdma is done
179 *
180 * @adev: amdgpu device the sdma memory copy is executing on
181 * @mfence: migrate fence
182 *
183 * Wait for dma fence is signaled, if the copy ssplit into multiple sdma
184 * operations, this is the last sdma operation fence.
185 *
186 * Context: called after svm_migrate_copy_memory
187 *
188 * Return:
189 * 0 - success
190 * otherwise - error code from dma fence signal
191 */
192static int
193svm_migrate_copy_done(struct amdgpu_device *adev, struct dma_fence *mfence)
194{
195 int r = 0;
196
197 if (mfence) {
198 r = dma_fence_wait(fence: mfence, intr: false);
199 dma_fence_put(fence: mfence);
200 pr_debug("sdma copy memory fence done\n");
201 }
202
203 return r;
204}
205
206unsigned long
207svm_migrate_addr_to_pfn(struct amdgpu_device *adev, unsigned long addr)
208{
209 return (addr + adev->kfd.pgmap.range.start) >> PAGE_SHIFT;
210}
211
212static void
213svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn)
214{
215 struct page *page;
216
217 page = pfn_to_page(pfn);
218 svm_range_bo_ref(svm_bo: prange->svm_bo);
219 page->zone_device_data = prange->svm_bo;
220 zone_device_page_init(page, pgmap: page_pgmap(page), order: 0);
221}
222
223static void
224svm_migrate_put_vram_page(struct amdgpu_device *adev, unsigned long addr)
225{
226 struct page *page;
227
228 page = pfn_to_page(svm_migrate_addr_to_pfn(adev, addr));
229 unlock_page(page);
230 put_page(page);
231}
232
233static unsigned long
234svm_migrate_addr(struct amdgpu_device *adev, struct page *page)
235{
236 unsigned long addr;
237
238 addr = page_to_pfn(page) << PAGE_SHIFT;
239 return (addr - adev->kfd.pgmap.range.start);
240}
241
242static struct page *
243svm_migrate_get_sys_page(struct vm_area_struct *vma, unsigned long addr)
244{
245 struct page *page;
246
247 page = alloc_page_vma(GFP_HIGHUSER, vma, addr);
248 if (page)
249 lock_page(page);
250
251 return page;
252}
253
254static void svm_migrate_put_sys_page(unsigned long addr)
255{
256 struct page *page;
257
258 page = pfn_to_page(addr >> PAGE_SHIFT);
259 unlock_page(page);
260 put_page(page);
261}
262
263static unsigned long svm_migrate_successful_pages(struct migrate_vma *migrate)
264{
265 unsigned long mpages = 0;
266 unsigned long i;
267
268 for (i = 0; i < migrate->npages; i++) {
269 if (migrate->dst[i] & MIGRATE_PFN_VALID &&
270 migrate->src[i] & MIGRATE_PFN_MIGRATE)
271 mpages++;
272 }
273 return mpages;
274}
275
276static int
277svm_migrate_copy_to_vram(struct kfd_node *node, struct svm_range *prange,
278 struct migrate_vma *migrate, struct dma_fence **mfence,
279 dma_addr_t *scratch, u64 ttm_res_offset)
280{
281 u64 npages = migrate->npages;
282 struct amdgpu_device *adev = node->adev;
283 struct device *dev = adev->dev;
284 struct amdgpu_res_cursor cursor;
285 u64 mpages = 0;
286 dma_addr_t *src;
287 u64 *dst;
288 u64 i, j;
289 int r;
290
291 pr_debug("svms 0x%p [0x%lx 0x%lx 0x%llx]\n", prange->svms, prange->start,
292 prange->last, ttm_res_offset);
293
294 src = scratch;
295 dst = (u64 *)(scratch + npages);
296
297 amdgpu_res_first(res: prange->ttm_res, start: ttm_res_offset,
298 size: npages << PAGE_SHIFT, cur: &cursor);
299 for (i = j = 0; (i < npages) && (mpages < migrate->cpages); i++) {
300 struct page *spage;
301
302 if (migrate->src[i] & MIGRATE_PFN_MIGRATE) {
303 dst[i] = cursor.start + (j << PAGE_SHIFT);
304 migrate->dst[i] = svm_migrate_addr_to_pfn(adev, addr: dst[i]);
305 svm_migrate_get_vram_page(prange, pfn: migrate->dst[i]);
306 migrate->dst[i] = migrate_pfn(pfn: migrate->dst[i]);
307 mpages++;
308 }
309 spage = migrate_pfn_to_page(mpfn: migrate->src[i]);
310 if (spage && !is_zone_device_page(page: spage)) {
311 src[i] = dma_map_page(dev, spage, 0, PAGE_SIZE,
312 DMA_BIDIRECTIONAL);
313 r = dma_mapping_error(dev, dma_addr: src[i]);
314 if (r) {
315 dev_err(dev, "%s: fail %d dma_map_page\n",
316 __func__, r);
317 goto out_free_vram_pages;
318 }
319 } else {
320 if (j) {
321 r = svm_migrate_copy_memory_gart(
322 adev, sys: src + i - j,
323 vram: dst + i - j, npages: j,
324 direction: FROM_RAM_TO_VRAM,
325 mfence);
326 if (r)
327 goto out_free_vram_pages;
328 amdgpu_res_next(cur: &cursor, size: (j + 1) << PAGE_SHIFT);
329 j = 0;
330 } else {
331 amdgpu_res_next(cur: &cursor, PAGE_SIZE);
332 }
333 continue;
334 }
335
336 pr_debug_ratelimited("dma mapping src to 0x%llx, pfn 0x%lx\n",
337 src[i] >> PAGE_SHIFT, page_to_pfn(spage));
338
339 if (j >= (cursor.size >> PAGE_SHIFT) - 1 && i < npages - 1) {
340 r = svm_migrate_copy_memory_gart(adev, sys: src + i - j,
341 vram: dst + i - j, npages: j + 1,
342 direction: FROM_RAM_TO_VRAM,
343 mfence);
344 if (r)
345 goto out_free_vram_pages;
346 amdgpu_res_next(cur: &cursor, size: (j + 1) * PAGE_SIZE);
347 j = 0;
348 } else {
349 j++;
350 }
351 }
352
353 r = svm_migrate_copy_memory_gart(adev, sys: src + i - j, vram: dst + i - j, npages: j,
354 direction: FROM_RAM_TO_VRAM, mfence);
355
356out_free_vram_pages:
357 if (r) {
358 pr_debug("failed %d to copy memory to vram\n", r);
359 for (i = 0; i < npages && mpages; i++) {
360 if (!dst[i])
361 continue;
362 svm_migrate_put_vram_page(adev, addr: dst[i]);
363 migrate->dst[i] = 0;
364 mpages--;
365 }
366 }
367
368#ifdef DEBUG_FORCE_MIXED_DOMAINS
369 for (i = 0, j = 0; i < npages; i += 4, j++) {
370 if (j & 1)
371 continue;
372 svm_migrate_put_vram_page(adev, dst[i]);
373 migrate->dst[i] = 0;
374 svm_migrate_put_vram_page(adev, dst[i + 1]);
375 migrate->dst[i + 1] = 0;
376 svm_migrate_put_vram_page(adev, dst[i + 2]);
377 migrate->dst[i + 2] = 0;
378 svm_migrate_put_vram_page(adev, dst[i + 3]);
379 migrate->dst[i + 3] = 0;
380 }
381#endif
382
383 return r;
384}
385
386static long
387svm_migrate_vma_to_vram(struct kfd_node *node, struct svm_range *prange,
388 struct vm_area_struct *vma, u64 start,
389 u64 end, uint32_t trigger, u64 ttm_res_offset)
390{
391 struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms);
392 u64 npages = (end - start) >> PAGE_SHIFT;
393 struct amdgpu_device *adev = node->adev;
394 struct kfd_process_device *pdd;
395 struct dma_fence *mfence = NULL;
396 struct migrate_vma migrate = { 0 };
397 unsigned long cpages = 0;
398 unsigned long mpages = 0;
399 dma_addr_t *scratch;
400 void *buf;
401 int r = -ENOMEM;
402
403 memset(&migrate, 0, sizeof(migrate));
404 migrate.vma = vma;
405 migrate.start = start;
406 migrate.end = end;
407 migrate.flags = MIGRATE_VMA_SELECT_SYSTEM;
408 migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev);
409
410 buf = kvcalloc(npages,
411 2 * sizeof(*migrate.src) + sizeof(u64) + sizeof(dma_addr_t),
412 GFP_KERNEL);
413 if (!buf)
414 goto out;
415
416 migrate.src = buf;
417 migrate.dst = migrate.src + npages;
418 scratch = (dma_addr_t *)(migrate.dst + npages);
419
420 kfd_smi_event_migration_start(node, pid: p->lead_thread->pid,
421 start: start >> PAGE_SHIFT, end: end >> PAGE_SHIFT,
422 from: 0, to: node->id, prefetch_loc: prange->prefetch_loc,
423 preferred_loc: prange->preferred_loc, trigger);
424
425 r = migrate_vma_setup(args: &migrate);
426 if (r) {
427 dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n",
428 __func__, r, prange->start, prange->last);
429 goto out_free;
430 }
431
432 cpages = migrate.cpages;
433 if (!cpages) {
434 pr_debug("failed collect migrate sys pages [0x%lx 0x%lx]\n",
435 prange->start, prange->last);
436 goto out_free;
437 }
438 if (cpages != npages)
439 pr_debug("partial migration, 0x%lx/0x%llx pages collected\n",
440 cpages, npages);
441 else
442 pr_debug("0x%lx pages collected\n", cpages);
443
444 r = svm_migrate_copy_to_vram(node, prange, migrate: &migrate, mfence: &mfence, scratch, ttm_res_offset);
445 migrate_vma_pages(migrate: &migrate);
446
447 svm_migrate_copy_done(adev, mfence);
448 migrate_vma_finalize(migrate: &migrate);
449
450 mpages = svm_migrate_successful_pages(migrate: &migrate);
451 pr_debug("migrated/collected/requested 0x%lx/0x%lx/0x%lx\n",
452 mpages, cpages, migrate.npages);
453
454 svm_range_dma_unmap_dev(dev: adev->dev, dma_addr: scratch, offset: 0, npages);
455
456out_free:
457 kvfree(addr: buf);
458 kfd_smi_event_migration_end(node, pid: p->lead_thread->pid,
459 start: start >> PAGE_SHIFT, end: end >> PAGE_SHIFT,
460 from: 0, to: node->id, trigger, error_code: r);
461out:
462 if (!r && mpages) {
463 pdd = svm_range_get_pdd_by_node(prange, node);
464 if (pdd)
465 WRITE_ONCE(pdd->page_in, pdd->page_in + mpages);
466
467 return mpages;
468 }
469 return r;
470}
471
472/**
473 * svm_migrate_ram_to_vram - migrate svm range from system to device
474 * @prange: range structure
475 * @best_loc: the device to migrate to
476 * @start_mgr: start page to migrate
477 * @last_mgr: last page to migrate
478 * @mm: the process mm structure
479 * @trigger: reason of migration
480 *
481 * Context: Process context, caller hold mmap read lock, svms lock, prange lock
482 *
483 * Return:
484 * 0 - OK, otherwise error code
485 */
486static int
487svm_migrate_ram_to_vram(struct svm_range *prange, uint32_t best_loc,
488 unsigned long start_mgr, unsigned long last_mgr,
489 struct mm_struct *mm, uint32_t trigger)
490{
491 unsigned long addr, start, end;
492 struct vm_area_struct *vma;
493 u64 ttm_res_offset;
494 struct kfd_node *node;
495 unsigned long mpages = 0;
496 long r = 0;
497
498 if (start_mgr < prange->start || last_mgr > prange->last) {
499 pr_debug("range [0x%lx 0x%lx] out prange [0x%lx 0x%lx]\n",
500 start_mgr, last_mgr, prange->start, prange->last);
501 return -EFAULT;
502 }
503
504 node = svm_range_get_node_by_id(prange, gpu_id: best_loc);
505 if (!node) {
506 pr_debug("failed to get kfd node by id 0x%x\n", best_loc);
507 return -ENODEV;
508 }
509
510 pr_debug("svms 0x%p [0x%lx 0x%lx] in [0x%lx 0x%lx] to gpu 0x%x\n",
511 prange->svms, start_mgr, last_mgr, prange->start, prange->last,
512 best_loc);
513
514 start = start_mgr << PAGE_SHIFT;
515 end = (last_mgr + 1) << PAGE_SHIFT;
516
517 r = amdgpu_amdkfd_reserve_mem_limit(adev: node->adev,
518 size: prange->npages * PAGE_SIZE,
519 KFD_IOC_ALLOC_MEM_FLAGS_VRAM,
520 xcp_id: node->xcp ? node->xcp->id : 0);
521 if (r) {
522 dev_dbg(node->adev->dev, "failed to reserve VRAM, r: %ld\n", r);
523 return -ENOSPC;
524 }
525
526 r = svm_range_vram_node_new(node, prange, clear: true);
527 if (r) {
528 dev_dbg(node->adev->dev, "fail %ld to alloc vram\n", r);
529 goto out;
530 }
531 ttm_res_offset = (start_mgr - prange->start + prange->offset) << PAGE_SHIFT;
532
533 for (addr = start; addr < end;) {
534 unsigned long next;
535
536 vma = vma_lookup(mm, addr);
537 if (!vma)
538 break;
539
540 next = min(vma->vm_end, end);
541 r = svm_migrate_vma_to_vram(node, prange, vma, start: addr, end: next, trigger, ttm_res_offset);
542 if (r < 0) {
543 pr_debug("failed %ld to migrate\n", r);
544 break;
545 } else {
546 mpages += r;
547 }
548 ttm_res_offset += next - addr;
549 addr = next;
550 }
551
552 if (mpages) {
553 prange->actual_loc = best_loc;
554 prange->vram_pages += mpages;
555 } else if (!prange->actual_loc) {
556 /* if no page migrated and all pages from prange are at
557 * sys ram drop svm_bo got from svm_range_vram_node_new
558 */
559 svm_range_vram_node_free(prange);
560 }
561
562out:
563 amdgpu_amdkfd_unreserve_mem_limit(adev: node->adev,
564 size: prange->npages * PAGE_SIZE,
565 KFD_IOC_ALLOC_MEM_FLAGS_VRAM,
566 xcp_id: node->xcp ? node->xcp->id : 0);
567 return r < 0 ? r : 0;
568}
569
570static void svm_migrate_folio_free(struct folio *folio)
571{
572 struct page *page = &folio->page;
573 struct svm_range_bo *svm_bo = page->zone_device_data;
574
575 if (svm_bo) {
576 pr_debug_ratelimited("ref: %d\n", kref_read(&svm_bo->kref));
577 svm_range_bo_unref_async(svm_bo);
578 }
579}
580
581static int
582svm_migrate_copy_to_ram(struct amdgpu_device *adev, struct svm_range *prange,
583 struct migrate_vma *migrate, struct dma_fence **mfence,
584 dma_addr_t *scratch, u64 npages)
585{
586 struct device *dev = adev->dev;
587 u64 *src;
588 dma_addr_t *dst;
589 struct page *dpage;
590 u64 i = 0, j;
591 u64 addr;
592 int r = 0;
593
594 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start,
595 prange->last);
596
597 addr = migrate->start;
598
599 src = (u64 *)(scratch + npages);
600 dst = scratch;
601
602 for (i = 0, j = 0; i < npages; i++, addr += PAGE_SIZE) {
603 struct page *spage;
604
605 spage = migrate_pfn_to_page(mpfn: migrate->src[i]);
606 if (!spage || !is_zone_device_page(page: spage)) {
607 pr_debug("invalid page. Could be in CPU already svms 0x%p [0x%lx 0x%lx]\n",
608 prange->svms, prange->start, prange->last);
609 if (j) {
610 r = svm_migrate_copy_memory_gart(adev, sys: dst + i - j,
611 vram: src + i - j, npages: j,
612 direction: FROM_VRAM_TO_RAM,
613 mfence);
614 if (r)
615 goto out_oom;
616 j = 0;
617 }
618 continue;
619 }
620 src[i] = svm_migrate_addr(adev, page: spage);
621 if (j > 0 && src[i] != src[i - 1] + PAGE_SIZE) {
622 r = svm_migrate_copy_memory_gart(adev, sys: dst + i - j,
623 vram: src + i - j, npages: j,
624 direction: FROM_VRAM_TO_RAM,
625 mfence);
626 if (r)
627 goto out_oom;
628 j = 0;
629 }
630
631 dpage = svm_migrate_get_sys_page(vma: migrate->vma, addr);
632 if (!dpage) {
633 pr_debug("failed get page svms 0x%p [0x%lx 0x%lx]\n",
634 prange->svms, prange->start, prange->last);
635 r = -ENOMEM;
636 goto out_oom;
637 }
638
639 dst[i] = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
640 r = dma_mapping_error(dev, dma_addr: dst[i]);
641 if (r) {
642 dev_err(adev->dev, "%s: fail %d dma_map_page\n", __func__, r);
643 goto out_oom;
644 }
645
646 pr_debug_ratelimited("dma mapping dst to 0x%llx, pfn 0x%lx\n",
647 dst[i] >> PAGE_SHIFT, page_to_pfn(dpage));
648
649 migrate->dst[i] = migrate_pfn(page_to_pfn(dpage));
650 j++;
651 }
652
653 r = svm_migrate_copy_memory_gart(adev, sys: dst + i - j, vram: src + i - j, npages: j,
654 direction: FROM_VRAM_TO_RAM, mfence);
655
656out_oom:
657 if (r) {
658 pr_debug("failed %d copy to ram\n", r);
659 while (i--) {
660 svm_migrate_put_sys_page(addr: dst[i]);
661 migrate->dst[i] = 0;
662 }
663 }
664
665 return r;
666}
667
668/**
669 * svm_migrate_vma_to_ram - migrate range inside one vma from device to system
670 *
671 * @prange: svm range structure
672 * @vma: vm_area_struct that range [start, end] belongs to
673 * @start: range start virtual address in pages
674 * @end: range end virtual address in pages
675 * @node: kfd node device to migrate from
676 * @trigger: reason of migration
677 * @fault_page: is from vmf->page, svm_migrate_to_ram(), this is CPU page fault callback
678 *
679 * Context: Process context, caller hold mmap read lock, prange->migrate_mutex
680 *
681 * Return:
682 * negative values - indicate error
683 * positive values or zero - number of pages got migrated
684 */
685static long
686svm_migrate_vma_to_ram(struct kfd_node *node, struct svm_range *prange,
687 struct vm_area_struct *vma, u64 start, u64 end,
688 uint32_t trigger, struct page *fault_page)
689{
690 struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms);
691 u64 npages = (end - start) >> PAGE_SHIFT;
692 unsigned long cpages = 0;
693 unsigned long mpages = 0;
694 struct amdgpu_device *adev = node->adev;
695 struct kfd_process_device *pdd;
696 struct dma_fence *mfence = NULL;
697 struct migrate_vma migrate = { 0 };
698 dma_addr_t *scratch;
699 void *buf;
700 int r = -ENOMEM;
701
702 memset(&migrate, 0, sizeof(migrate));
703 migrate.vma = vma;
704 migrate.start = start;
705 migrate.end = end;
706 migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev);
707 if (adev->gmc.xgmi.connected_to_cpu)
708 migrate.flags = MIGRATE_VMA_SELECT_DEVICE_COHERENT;
709 else
710 migrate.flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE;
711
712 buf = kvcalloc(npages,
713 2 * sizeof(*migrate.src) + sizeof(u64) + sizeof(dma_addr_t),
714 GFP_KERNEL);
715 if (!buf)
716 goto out;
717
718 migrate.src = buf;
719 migrate.dst = migrate.src + npages;
720 migrate.fault_page = fault_page;
721 scratch = (dma_addr_t *)(migrate.dst + npages);
722
723 kfd_smi_event_migration_start(node, pid: p->lead_thread->pid,
724 start: start >> PAGE_SHIFT, end: end >> PAGE_SHIFT,
725 from: node->id, to: 0, prefetch_loc: prange->prefetch_loc,
726 preferred_loc: prange->preferred_loc, trigger);
727
728 r = migrate_vma_setup(args: &migrate);
729 if (r) {
730 dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n",
731 __func__, r, prange->start, prange->last);
732 goto out_free;
733 }
734
735 cpages = migrate.cpages;
736 if (!cpages) {
737 pr_debug("failed collect migrate device pages [0x%lx 0x%lx]\n",
738 prange->start, prange->last);
739 goto out_free;
740 }
741 if (cpages != npages)
742 pr_debug("partial migration, 0x%lx/0x%llx pages collected\n",
743 cpages, npages);
744 else
745 pr_debug("0x%lx pages collected\n", cpages);
746
747 r = svm_migrate_copy_to_ram(adev, prange, migrate: &migrate, mfence: &mfence,
748 scratch, npages);
749 migrate_vma_pages(migrate: &migrate);
750
751 mpages = svm_migrate_successful_pages(migrate: &migrate);
752 pr_debug("migrated/collected/requested 0x%lx/0x%lx/0x%lx\n",
753 mpages, cpages, migrate.npages);
754
755 svm_migrate_copy_done(adev, mfence);
756 migrate_vma_finalize(migrate: &migrate);
757
758 svm_range_dma_unmap_dev(dev: adev->dev, dma_addr: scratch, offset: 0, npages);
759
760out_free:
761 kvfree(addr: buf);
762 kfd_smi_event_migration_end(node, pid: p->lead_thread->pid,
763 start: start >> PAGE_SHIFT, end: end >> PAGE_SHIFT,
764 from: node->id, to: 0, trigger, error_code: r);
765out:
766 if (!r && mpages) {
767 pdd = svm_range_get_pdd_by_node(prange, node);
768 if (pdd)
769 WRITE_ONCE(pdd->page_out, pdd->page_out + mpages);
770 }
771
772 return r ? r : mpages;
773}
774
775/**
776 * svm_migrate_vram_to_ram - migrate svm range from device to system
777 * @prange: range structure
778 * @mm: process mm, use current->mm if NULL
779 * @start_mgr: start page need be migrated to sys ram
780 * @last_mgr: last page need be migrated to sys ram
781 * @trigger: reason of migration
782 * @fault_page: is from vmf->page, svm_migrate_to_ram(), this is CPU page fault callback
783 *
784 * Context: Process context, caller hold mmap read lock, prange->migrate_mutex
785 *
786 * Return:
787 * 0 - OK, otherwise error code
788 */
789int svm_migrate_vram_to_ram(struct svm_range *prange, struct mm_struct *mm,
790 unsigned long start_mgr, unsigned long last_mgr,
791 uint32_t trigger, struct page *fault_page)
792{
793 struct kfd_node *node;
794 struct vm_area_struct *vma;
795 unsigned long addr;
796 unsigned long start;
797 unsigned long end;
798 unsigned long mpages = 0;
799 long r = 0;
800
801 /* this pragne has no any vram page to migrate to sys ram */
802 if (!prange->actual_loc) {
803 pr_debug("[0x%lx 0x%lx] already migrated to ram\n",
804 prange->start, prange->last);
805 return 0;
806 }
807
808 if (start_mgr < prange->start || last_mgr > prange->last) {
809 pr_debug("range [0x%lx 0x%lx] out prange [0x%lx 0x%lx]\n",
810 start_mgr, last_mgr, prange->start, prange->last);
811 return -EFAULT;
812 }
813
814 node = svm_range_get_node_by_id(prange, gpu_id: prange->actual_loc);
815 if (!node) {
816 pr_debug("failed to get kfd node by id 0x%x\n", prange->actual_loc);
817 return -ENODEV;
818 }
819 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] from gpu 0x%x to ram\n",
820 prange->svms, prange, start_mgr, last_mgr,
821 prange->actual_loc);
822
823 start = start_mgr << PAGE_SHIFT;
824 end = (last_mgr + 1) << PAGE_SHIFT;
825
826 for (addr = start; addr < end;) {
827 unsigned long next;
828
829 vma = vma_lookup(mm, addr);
830 if (!vma) {
831 pr_debug("failed to find vma for prange %p\n", prange);
832 r = -EFAULT;
833 break;
834 }
835
836 next = min(vma->vm_end, end);
837 r = svm_migrate_vma_to_ram(node, prange, vma, start: addr, end: next, trigger,
838 fault_page);
839 if (r < 0) {
840 pr_debug("failed %ld to migrate prange %p\n", r, prange);
841 break;
842 } else {
843 mpages += r;
844 }
845 addr = next;
846 }
847
848 if (r >= 0) {
849 WARN_ONCE(prange->vram_pages < mpages,
850 "Recorded vram pages(0x%llx) should not be less than migration pages(0x%lx).",
851 prange->vram_pages, mpages);
852 prange->vram_pages -= mpages;
853
854 /* prange does not have vram page set its actual_loc to system
855 * and drop its svm_bo ref
856 */
857 if (prange->vram_pages == 0 && prange->ttm_res) {
858 prange->actual_loc = 0;
859 svm_range_vram_node_free(prange);
860 }
861 }
862
863 return r < 0 ? r : 0;
864}
865
866/**
867 * svm_migrate_vram_to_vram - migrate svm range from device to device
868 * @prange: range structure
869 * @best_loc: the device to migrate to
870 * @start: start page need be migrated to sys ram
871 * @last: last page need be migrated to sys ram
872 * @mm: process mm, use current->mm if NULL
873 * @trigger: reason of migration
874 *
875 * Context: Process context, caller hold mmap read lock, svms lock, prange lock
876 *
877 * migrate all vram pages in prange to sys ram, then migrate
878 * [start, last] pages from sys ram to gpu node best_loc.
879 *
880 * Return:
881 * 0 - OK, otherwise error code
882 */
883static int
884svm_migrate_vram_to_vram(struct svm_range *prange, uint32_t best_loc,
885 unsigned long start, unsigned long last,
886 struct mm_struct *mm, uint32_t trigger)
887{
888 int r, retries = 3;
889
890 /*
891 * TODO: for both devices with PCIe large bar or on same xgmi hive, skip
892 * system memory as migration bridge
893 */
894
895 pr_debug("from gpu 0x%x to gpu 0x%x\n", prange->actual_loc, best_loc);
896
897 do {
898 r = svm_migrate_vram_to_ram(prange, mm, start_mgr: prange->start, last_mgr: prange->last,
899 trigger, NULL);
900 if (r)
901 return r;
902 } while (prange->actual_loc && --retries);
903
904 if (prange->actual_loc)
905 return -EDEADLK;
906
907 return svm_migrate_ram_to_vram(prange, best_loc, start_mgr: start, last_mgr: last, mm, trigger);
908}
909
910int
911svm_migrate_to_vram(struct svm_range *prange, uint32_t best_loc,
912 unsigned long start, unsigned long last,
913 struct mm_struct *mm, uint32_t trigger)
914{
915 if (!prange->actual_loc || prange->actual_loc == best_loc)
916 return svm_migrate_ram_to_vram(prange, best_loc, start_mgr: start, last_mgr: last,
917 mm, trigger);
918
919 else
920 return svm_migrate_vram_to_vram(prange, best_loc, start, last,
921 mm, trigger);
922
923}
924
925/**
926 * svm_migrate_to_ram - CPU page fault handler
927 * @vmf: CPU vm fault vma, address
928 *
929 * Context: vm fault handler, caller holds the mmap read lock
930 *
931 * Return:
932 * 0 - OK
933 * VM_FAULT_SIGBUS - notice application to have SIGBUS page fault
934 */
935static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf)
936{
937 unsigned long start, last, size;
938 unsigned long addr = vmf->address;
939 struct svm_range_bo *svm_bo;
940 struct svm_range *prange;
941 struct kfd_process *p;
942 struct mm_struct *mm;
943 int r = 0;
944
945 svm_bo = vmf->page->zone_device_data;
946 if (!svm_bo) {
947 pr_debug("failed get device page at addr 0x%lx\n", addr);
948 return VM_FAULT_SIGBUS;
949 }
950 if (!mmget_not_zero(mm: svm_bo->eviction_fence->mm)) {
951 pr_debug("addr 0x%lx of process mm is destroyed\n", addr);
952 return VM_FAULT_SIGBUS;
953 }
954
955 mm = svm_bo->eviction_fence->mm;
956 if (mm != vmf->vma->vm_mm)
957 pr_debug("addr 0x%lx is COW mapping in child process\n", addr);
958
959 p = kfd_lookup_process_by_mm(mm);
960 if (!p) {
961 pr_debug("failed find process at fault address 0x%lx\n", addr);
962 r = VM_FAULT_SIGBUS;
963 goto out_mmput;
964 }
965 if (READ_ONCE(p->svms.faulting_task) == current) {
966 pr_debug("skipping ram migration\n");
967 r = 0;
968 goto out_unref_process;
969 }
970
971 pr_debug("CPU page fault svms 0x%p address 0x%lx\n", &p->svms, addr);
972 addr >>= PAGE_SHIFT;
973
974 mutex_lock(&p->svms.lock);
975
976 prange = svm_range_from_addr(svms: &p->svms, addr, NULL);
977 if (!prange) {
978 pr_debug("failed get range svms 0x%p addr 0x%lx\n", &p->svms, addr);
979 r = -EFAULT;
980 goto out_unlock_svms;
981 }
982
983 mutex_lock(&prange->migrate_mutex);
984
985 if (!prange->actual_loc)
986 goto out_unlock_prange;
987
988 /* Align migration range start and size to granularity size */
989 size = 1UL << prange->granularity;
990 start = max(ALIGN_DOWN(addr, size), prange->start);
991 last = min(ALIGN(addr + 1, size) - 1, prange->last);
992
993 r = svm_migrate_vram_to_ram(prange, mm: vmf->vma->vm_mm, start_mgr: start, last_mgr: last,
994 trigger: KFD_MIGRATE_TRIGGER_PAGEFAULT_CPU, fault_page: vmf->page);
995 if (r)
996 pr_debug("failed %d migrate svms 0x%p range 0x%p [0x%lx 0x%lx]\n",
997 r, prange->svms, prange, start, last);
998
999out_unlock_prange:
1000 mutex_unlock(lock: &prange->migrate_mutex);
1001out_unlock_svms:
1002 mutex_unlock(lock: &p->svms.lock);
1003out_unref_process:
1004 pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr);
1005 kfd_unref_process(p);
1006out_mmput:
1007 mmput(mm);
1008 return r ? VM_FAULT_SIGBUS : 0;
1009}
1010
1011static const struct dev_pagemap_ops svm_migrate_pgmap_ops = {
1012 .folio_free = svm_migrate_folio_free,
1013 .migrate_to_ram = svm_migrate_to_ram,
1014};
1015
1016/* Each VRAM page uses sizeof(struct page) on system memory */
1017#define SVM_HMM_PAGE_STRUCT_SIZE(size) ((size)/PAGE_SIZE * sizeof(struct page))
1018
1019int kgd2kfd_init_zone_device(struct amdgpu_device *adev)
1020{
1021 struct amdgpu_kfd_dev *kfddev = &adev->kfd;
1022 struct dev_pagemap *pgmap;
1023 struct resource *res = NULL;
1024 unsigned long size;
1025 void *r;
1026
1027 /* Page migration works on gfx9 or newer */
1028 if (amdgpu_ip_version(adev, ip: GC_HWIP, inst: 0) < IP_VERSION(9, 0, 1))
1029 return -EINVAL;
1030
1031 if (adev->apu_prefer_gtt)
1032 return 0;
1033
1034 pgmap = &kfddev->pgmap;
1035 memset(pgmap, 0, sizeof(*pgmap));
1036
1037 /* TODO: register all vram to HMM for now.
1038 * should remove reserved size
1039 */
1040 size = ALIGN(adev->gmc.real_vram_size, 2ULL << 20);
1041 if (adev->gmc.xgmi.connected_to_cpu) {
1042 pgmap->range.start = adev->gmc.aper_base;
1043 pgmap->range.end = adev->gmc.aper_base + adev->gmc.aper_size - 1;
1044 pgmap->type = MEMORY_DEVICE_COHERENT;
1045 } else {
1046 res = devm_request_free_mem_region(dev: adev->dev, base: &iomem_resource, size);
1047 if (IS_ERR(ptr: res))
1048 return PTR_ERR(ptr: res);
1049 pgmap->range.start = res->start;
1050 pgmap->range.end = res->end;
1051 pgmap->type = MEMORY_DEVICE_PRIVATE;
1052 }
1053
1054 pgmap->nr_range = 1;
1055 pgmap->ops = &svm_migrate_pgmap_ops;
1056 pgmap->owner = SVM_ADEV_PGMAP_OWNER(adev);
1057 pgmap->flags = 0;
1058 /* Device manager releases device-specific resources, memory region and
1059 * pgmap when driver disconnects from device.
1060 */
1061 r = devm_memremap_pages(dev: adev->dev, pgmap);
1062 if (IS_ERR(ptr: r)) {
1063 pr_err("failed to register HMM device memory\n");
1064 if (pgmap->type == MEMORY_DEVICE_PRIVATE)
1065 devm_release_mem_region(adev->dev, res->start, resource_size(res));
1066 /* Disable SVM support capability */
1067 pgmap->type = 0;
1068 return PTR_ERR(ptr: r);
1069 }
1070
1071 pr_debug("reserve %ldMB system memory for VRAM pages struct\n",
1072 SVM_HMM_PAGE_STRUCT_SIZE(size) >> 20);
1073
1074 amdgpu_amdkfd_reserve_system_mem(SVM_HMM_PAGE_STRUCT_SIZE(size));
1075
1076 pr_info("HMM registered %ldMB device memory\n", size >> 20);
1077
1078 return 0;
1079}
1080

source code of linux/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c