[Why]
svm ranges can have mixed pages from device or system memory.
A good example is, after a prange has been allocated in VRAM and a
copy-on-write is triggered by a fork. This invalidates some pages
inside the prange. Endding up in mixed pages.
[How]
By classifying each page inside a prange, based on its type. Device or
system memory, during dma mapping call. If page corresponds
to VRAM domain, a flag is set to its dma_addr entry for each GPU.
Then, at the GPU page table mapping. All group of contiguous pages within
the same type are mapped with their proper pte flags.
Signed-off-by: Alex Sierra <alex.sierra@xxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 58 +++++++++++++++++++---------
drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 2 +
2 files changed, 42 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 7104762a0119..94fe9ab70e94 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -141,6 +141,12 @@ svm_range_dma_map_dev(struct device *dev, dma_addr_t **dma_addr,
dma_unmap_page(dev, addr[i], PAGE_SIZE, dir);
page = hmm_pfn_to_page(hmm_pfns[i]);
+ if (is_zone_device_page(page)) {
+ addr[i] = hmm_pfns[i] << PAGE_SHIFT;
+ addr[i] |= SVM_RANGE_VRAM_DOMAIN;
+ pr_debug("vram address detected: 0x%llx\n", addr[i] >> PAGE_SHIFT);
+ continue;
+ }
addr[i] = dma_map_page(dev, page, 0, PAGE_SIZE, dir);
r = dma_mapping_error(dev, addr[i]);
if (r) {
@@ -1131,33 +1137,49 @@ svm_range_map_to_gpu(struct amdgpu_device *adev, struct amdgpu_vm *vm,
struct amdgpu_device *bo_adev, struct dma_fence **fence)
{
struct amdgpu_bo_va bo_va;
+ struct ttm_resource *ttm_res;
uint64_t pte_flags;
+ unsigned long last_start;
+ int last_domain;
int r = 0;
+ int64_t i, j;
pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start,
prange->last);
- if (prange->svm_bo && prange->ttm_res) {
+ if (prange->svm_bo && prange->ttm_res)
bo_va.is_xgmi = amdgpu_xgmi_same_hive(adev, bo_adev);
- prange->mapping.bo_va = &bo_va;
- }
-
- prange->mapping.start = prange->start;
- prange->mapping.last = prange->last;
- prange->mapping.offset = prange->offset;
- pte_flags = svm_range_get_pte_flags(adev, prange);
- r = amdgpu_vm_bo_update_mapping(adev, bo_adev, vm, false, false, NULL,
- prange->mapping.start,
- prange->mapping.last, pte_flags,
- prange->mapping.offset,
- prange->ttm_res ?
- prange->ttm_res->mm_node : NULL,
- dma_addr, &vm->last_update);
- if (r) {
- pr_debug("failed %d to map to gpu 0x%lx\n", r, prange->start);
- goto out;
+ ttm_res = prange->ttm_res;
+ last_start = prange->start;
+ for (i = j = 0; i < prange->npages; i++) {
+ last_domain = dma_addr[i] & SVM_RANGE_VRAM_DOMAIN;
+ if ((last_start + j) < prange->last &&
+ last_domain == (dma_addr[i + 1] & SVM_RANGE_VRAM_DOMAIN)) {
+ j++;
+ continue;
+ }
+ pr_debug("Mapping range [0x%lx 0x%llx] on domain: %s\n",
+ last_start, last_start + j, last_domain ? "GPU" : "CPU");
+ prange->ttm_res = last_domain ? ttm_res : NULL;
+ pte_flags = svm_range_get_pte_flags(adev, prange);
+ r = amdgpu_vm_bo_update_mapping(adev, bo_adev, vm, false, false, NULL,
+ last_start,
+ last_start + j, pte_flags,
+ ((last_start - prange->start) << PAGE_SHIFT),
+ prange->ttm_res ?
+ prange->ttm_res->mm_node : NULL,
+ prange->ttm_res ? NULL :
+ dma_addr,
+ &vm->last_update);
+ if (r) {
+ pr_debug("failed %d to map to gpu 0x%lx\n", r, prange->start);
+ goto out;
+ }
+ last_start += j + 1;
+ j = 0;
}
+ prange->ttm_res = ttm_res;
r = amdgpu_vm_update_pdes(adev, vm, false);
if (r) {
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
index 573f984b81fe..bb85288cd658 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
@@ -35,6 +35,8 @@
#include "amdgpu.h"
#include "kfd_priv.h"
+#define SVM_RANGE_VRAM_DOMAIN (1UL << 0)
+
struct svm_range_bo {
struct amdgpu_bo *bo;
struct kref kref;
--
2.17.1
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