[PATCH 1/3] drm/amdkfd: classify and map mixed svm range pages in GPU
Alex Sierra
alex.sierra at amd.com
Wed May 12 17:34:27 UTC 2021
[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.
v2:
Instead of using ttm_res to calculate vram pfns in the svm_range. It is now
done by setting the vram real physical address into drm_addr array.
This makes more flexible VRAM management, plus removes the need to have
a BO reference in the svm_range.
Signed-off-by: Alex Sierra <alex.sierra at amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 71 ++++++++++++++++++----------
drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 1 +
2 files changed, 46 insertions(+), 26 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 2b4318646a75..0ab10cb24205 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -119,11 +119,12 @@ static void svm_range_remove_notifier(struct svm_range *prange)
}
static int
-svm_range_dma_map_dev(struct device *dev, dma_addr_t **dma_addr,
+svm_range_dma_map_dev(struct amdgpu_device *adev, dma_addr_t **dma_addr,
unsigned long *hmm_pfns, uint64_t npages)
{
enum dma_data_direction dir = DMA_BIDIRECTIONAL;
dma_addr_t *addr = *dma_addr;
+ struct device *dev = adev->dev;
struct page *page;
int i, r;
@@ -141,6 +142,14 @@ 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) +
+ adev->vm_manager.vram_base_offset -
+ adev->kfd.dev->pgmap.range.start;
+ addr[i] |= SVM_RANGE_VRAM_DOMAIN;
+ pr_debug("vram address detected: 0x%llx\n", addr[i]);
+ continue;
+ }
addr[i] = dma_map_page(dev, page, 0, PAGE_SIZE, dir);
r = dma_mapping_error(dev, addr[i]);
if (r) {
@@ -175,7 +184,7 @@ svm_range_dma_map(struct svm_range *prange, unsigned long *bitmap,
}
adev = (struct amdgpu_device *)pdd->dev->kgd;
- r = svm_range_dma_map_dev(adev->dev, &prange->dma_addr[gpuidx],
+ r = svm_range_dma_map_dev(adev, &prange->dma_addr[gpuidx],
hmm_pfns, prange->npages);
if (r)
break;
@@ -1003,21 +1012,22 @@ svm_range_split_by_granularity(struct kfd_process *p, struct mm_struct *mm,
}
static uint64_t
-svm_range_get_pte_flags(struct amdgpu_device *adev, struct svm_range *prange)
+svm_range_get_pte_flags(struct amdgpu_device *adev, struct svm_range *prange,
+ int domain)
{
struct amdgpu_device *bo_adev;
uint32_t flags = prange->flags;
uint32_t mapping_flags = 0;
uint64_t pte_flags;
- bool snoop = !prange->ttm_res;
+ bool snoop = !!domain;
bool coherent = flags & KFD_IOCTL_SVM_FLAG_COHERENT;
- if (prange->svm_bo && prange->ttm_res)
+ if (domain == SVM_RANGE_VRAM_DOMAIN)
bo_adev = amdgpu_ttm_adev(prange->svm_bo->bo->tbo.bdev);
switch (adev->asic_type) {
case CHIP_ARCTURUS:
- if (prange->svm_bo && prange->ttm_res) {
+ if (domain == SVM_RANGE_VRAM_DOMAIN) {
if (bo_adev == adev) {
mapping_flags |= coherent ?
AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW;
@@ -1032,7 +1042,7 @@ svm_range_get_pte_flags(struct amdgpu_device *adev, struct svm_range *prange)
}
break;
case CHIP_ALDEBARAN:
- if (prange->svm_bo && prange->ttm_res) {
+ if (domain == SVM_RANGE_VRAM_DOMAIN) {
if (bo_adev == adev) {
mapping_flags |= coherent ?
AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW;
@@ -1061,14 +1071,14 @@ svm_range_get_pte_flags(struct amdgpu_device *adev, struct svm_range *prange)
mapping_flags |= AMDGPU_VM_PAGE_EXECUTABLE;
pte_flags = AMDGPU_PTE_VALID;
- pte_flags |= prange->ttm_res ? 0 : AMDGPU_PTE_SYSTEM;
+ pte_flags |= (domain == SVM_RANGE_VRAM_DOMAIN) ? 0 : AMDGPU_PTE_SYSTEM;
pte_flags |= snoop ? AMDGPU_PTE_SNOOPED : 0;
pte_flags |= amdgpu_gem_va_map_flags(adev, mapping_flags);
pr_debug("svms 0x%p [0x%lx 0x%lx] vram %d PTE 0x%llx mapping 0x%x\n",
prange->svms, prange->start, prange->last,
- prange->ttm_res ? 1:0, pte_flags, mapping_flags);
+ (domain == SVM_RANGE_VRAM_DOMAIN) ? 1:0, pte_flags, mapping_flags);
return pte_flags;
}
@@ -1138,31 +1148,40 @@ svm_range_map_to_gpu(struct amdgpu_device *adev, struct amdgpu_vm *vm,
{
struct amdgpu_bo_va bo_va;
uint64_t pte_flags;
+ unsigned long last_start;
+ int last_domain;
int r = 0;
+ int64_t i;
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);
+ last_start = prange->start;
+ for (i = 0; i < prange->npages; i++) {
+ last_domain = dma_addr[i] & SVM_RANGE_VRAM_DOMAIN;
+ if ((prange->start + i) < prange->last &&
+ last_domain == (dma_addr[i + 1] & SVM_RANGE_VRAM_DOMAIN))
+ continue;
- 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;
+ pr_debug("Mapping range [0x%lx 0x%llx] on domain: %s\n",
+ last_start, prange->start + i, last_domain ? "GPU" : "CPU");
+ pte_flags = svm_range_get_pte_flags(adev, prange, last_domain);
+ r = amdgpu_vm_bo_update_mapping(adev, bo_adev, vm, false, false, NULL,
+ last_start,
+ prange->start + i, pte_flags,
+ prange->offset +
+ ((last_start - prange->start) << PAGE_SHIFT),
+ 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 = prange->start + i + 1;
}
r = amdgpu_vm_update_pdes(adev, vm, false);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
index 08542fe39303..e68aa51322df 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
@@ -35,6 +35,7 @@
#include "amdgpu.h"
#include "kfd_priv.h"
+#define SVM_RANGE_VRAM_DOMAIN (1UL << 0)
#define SVM_ADEV_PGMAP_OWNER(adev)\
((adev)->hive ? (void *)(adev)->hive : (void *)(adev))
--
2.17.1
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