[PATCH 1/1] drm/amdkfd: Fix partial migration bugs

[Philip Yang]

Migration range from system memory to VRAM, if system page can not be
locked or unmapped, we do partial migration and leave some pages in
system memory. Several bugs found to copy pages and update GPU mapping
for this situation:

1. copy to vram should use migrate->npage which is total pages of range
as npages, not migrate->cpages which is number of pages can be migrated.

2. After partial copy, set VRAM res cursor as j + 1, j is number of
system pages copied plus 1 page to skip copy.

3. copy to ram, should collect all continuous VRAM pages and copy
together.

4. Call amdgpu_vm_update_range, should pass in offset as bytes, not
as number of pages.

Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 6 +++---
 drivers/gpu/drm/amd/amdkfd/kfd_svm.c     | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index 43cd47723946..d03135a1f7e6 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -296,7 +296,7 @@ svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
 			 struct migrate_vma *migrate, struct dma_fence **mfence,
 			 dma_addr_t *scratch)
 {
-	uint64_t npages = migrate->cpages;
+	uint64_t npages = migrate->npages;
 	struct device *dev = adev->dev;
 	struct amdgpu_res_cursor cursor;
 	dma_addr_t *src;
@@ -344,7 +344,7 @@ svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
 						mfence);
 				if (r)
 					goto out_free_vram_pages;
-				amdgpu_res_next(&cursor, j << PAGE_SHIFT);
+				amdgpu_res_next(&cursor, (j + 1) << PAGE_SHIFT);
 				j = 0;
 			} else {
 				amdgpu_res_next(&cursor, PAGE_SIZE);
@@ -590,7 +590,7 @@ svm_migrate_copy_to_ram(struct amdgpu_device *adev, struct svm_range *prange,
 			continue;
 		}
 		src[i] = svm_migrate_addr(adev, spage);
-		if (i > 0 && src[i] != src[i - 1] + PAGE_SIZE) {
+		if (i > 0 && src[i] != src[i - 1] + PAGE_SIZE && j) {
 			r = svm_migrate_copy_memory_gart(adev, dst + i - j,
 							 src + i - j, j,
 							 FROM_VRAM_TO_RAM,
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 2ba3de0fb8aa..d6fc00d51c8c 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1295,7 +1295,7 @@ svm_range_map_to_gpu(struct kfd_process_device *pdd, struct svm_range *prange,
 		r = amdgpu_vm_update_range(adev, vm, false, false, flush_tlb, NULL,
 					   last_start, prange->start + i,
 					   pte_flags,
-					   last_start - prange->start,
+					   (last_start - prange->start) << PAGE_SHIFT,
 					   bo_adev ? bo_adev->vm_manager.vram_base_offset : 0,
 					   NULL, dma_addr, &vm->last_update);
 
-- 
2.35.1