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drm/amdkfd: Make TLB flush conditional on mapping

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It is to optimize memory mapping latency, and also aviod
a page fault in a corner case of changing valid PDE into
PTE.

Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Huang 2021-06-01 18:54:32 -04:00 committed by Alex Deucher
parent 075e8080c1
commit 31f3324378
4 changed files with 27 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
View File

@ -269,7 +269,7 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv,
uint64_t *size);
int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv);
struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv, bool *table_freed);
int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv);
int amdgpu_amdkfd_gpuvm_sync_memory(

19
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
View File

@ -1070,7 +1070,8 @@ static void unmap_bo_from_gpuvm(struct kgd_mem *mem,
static int update_gpuvm_pte(struct kgd_mem *mem,
struct kfd_mem_attachment *entry,
struct amdgpu_sync *sync)
struct amdgpu_sync *sync,
bool *table_freed)
{
struct amdgpu_bo_va *bo_va = entry->bo_va;
struct amdgpu_device *adev = entry->adev;
@ -1081,7 +1082,7 @@ static int update_gpuvm_pte(struct kgd_mem *mem,
return ret;
/* Update the page tables */
ret = amdgpu_vm_bo_update(adev, bo_va, false);
ret = amdgpu_vm_bo_update(adev, bo_va, false, table_freed);
if (ret) {
pr_err("amdgpu_vm_bo_update failed\n");
return ret;
@ -1093,7 +1094,8 @@ static int update_gpuvm_pte(struct kgd_mem *mem,
static int map_bo_to_gpuvm(struct kgd_mem *mem,
struct kfd_mem_attachment *entry,
struct amdgpu_sync *sync,
bool no_update_pte)
bool no_update_pte,
bool *table_freed)
{
int ret;
@ -1110,7 +1112,7 @@ static int map_bo_to_gpuvm(struct kgd_mem *mem,
if (no_update_pte)
return 0;
ret = update_gpuvm_pte(mem, entry, sync);
ret = update_gpuvm_pte(mem, entry, sync, table_freed);
if (ret) {
pr_err("update_gpuvm_pte() failed\n");
goto update_gpuvm_pte_failed;
@ -1608,7 +1610,8 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
}
int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv)
struct kgd_dev *kgd, struct kgd_mem *mem,
void *drm_priv, bool *table_freed)
{
struct amdgpu_device *adev = get_amdgpu_device(kgd);
struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
@ -1696,7 +1699,7 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
entry->va, entry->va + bo_size, entry);
ret = map_bo_to_gpuvm(mem, entry, ctx.sync,
is_invalid_userptr);
is_invalid_userptr, table_freed);
if (ret) {
pr_err("Failed to map bo to gpuvm\n");
goto out_unreserve;
@ -2146,7 +2149,7 @@ static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
continue;
kfd_mem_dmaunmap_attachment(mem, attachment);
ret = update_gpuvm_pte(mem, attachment, &sync);
ret = update_gpuvm_pte(mem, attachment, &sync, NULL);
if (ret) {
pr_err("%s: update PTE failed\n", __func__);
/* make sure this gets validated again */
@ -2352,7 +2355,7 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
continue;
kfd_mem_dmaunmap_attachment(mem, attachment);
ret = update_gpuvm_pte(mem, attachment, &sync_obj);
ret = update_gpuvm_pte(mem, attachment, &sync_obj, NULL);
if (ret) {
pr_debug("Memory eviction: update PTE failed. Try again\n");
goto validate_map_fail;

23
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View File

@ -1393,6 +1393,7 @@ static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
long err = 0;
int i;
uint32_t *devices_arr = NULL;
bool table_freed = false;
dev = kfd_device_by_id(GET_GPU_ID(args->handle));
if (!dev)
@ -1450,7 +1451,8 @@ static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
goto get_mem_obj_from_handle_failed;
}
err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
peer->kgd, (struct kgd_mem *)mem, peer_pdd->drm_priv);
peer->kgd, (struct kgd_mem *)mem,
peer_pdd->drm_priv, &table_freed);
if (err) {
pr_err("Failed to map to gpu %d/%d\n",
i, args->n_devices);
@ -1468,16 +1470,17 @@ static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
}
/* Flush TLBs after waiting for the page table updates to complete */
for (i = 0; i < args->n_devices; i++) {
peer = kfd_device_by_id(devices_arr[i]);
if (WARN_ON_ONCE(!peer))
continue;
peer_pdd = kfd_get_process_device_data(peer, p);
if (WARN_ON_ONCE(!peer_pdd))
continue;
kfd_flush_tlb(peer_pdd, TLB_FLUSH_LEGACY);
if (table_freed) {
for (i = 0; i < args->n_devices; i++) {
peer = kfd_device_by_id(devices_arr[i]);
if (WARN_ON_ONCE(!peer))
continue;
peer_pdd = kfd_get_process_device_data(peer, p);
if (WARN_ON_ONCE(!peer_pdd))
continue;
kfd_flush_tlb(peer_pdd, TLB_FLUSH_LEGACY);
}
}
kfree(devices_arr);
return err;

3
drivers/gpu/drm/amd/amdkfd/kfd_process.c
View File

@ -672,7 +672,8 @@ static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd,
if (err)
goto err_alloc_mem;
err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->kgd, mem, pdd->drm_priv);
err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->kgd, mem,
pdd->drm_priv, NULL);
if (err)
goto err_map_mem;