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drm/amdgpu: fix visible VRAM handling during faults 

When we removed the hacky start code check we actually didn't took into
account that *all* VRAM pages needs to be CPU accessible.

Clean up the code and unify the handling into a single helper which
checks if the whole resource is CPU accessible.

The only place where a partial check would make sense is during
eviction, but that is neglitible.

Signed-off-by: Christian König <christian.koenig@amd.com>
Fixes: aed01a6804 ("drm/amdgpu: Remove TTM resource->start visible VRAM condition v2")
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org
This commit is contained in:
Christian König 2024-04-04 16:25:40 +02:00 committed by Alex Deucher
parent 6fef2d4c00
commit a6ff969fe9
5 changed files with 59 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
View File

@ -819,7 +819,7 @@ retry:
p->bytes_moved += ctx.bytes_moved;
if (!amdgpu_gmc_vram_full_visible(&adev->gmc) &&
amdgpu_bo_in_cpu_visible_vram(bo))
amdgpu_res_cpu_visible(adev, bo->tbo.resource))
p->bytes_moved_vis += ctx.bytes_moved;
if (unlikely(r == -ENOMEM) && domain != bo->allowed_domains) {

22
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
View File

@ -617,8 +617,7 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
return r;
if (!amdgpu_gmc_vram_full_visible(&adev->gmc) &&
bo->tbo.resource->mem_type == TTM_PL_VRAM &&
amdgpu_bo_in_cpu_visible_vram(bo))
amdgpu_res_cpu_visible(adev, bo->tbo.resource))
amdgpu_cs_report_moved_bytes(adev, ctx.bytes_moved,
ctx.bytes_moved);
else
@ -1272,23 +1271,25 @@ void amdgpu_bo_move_notify(struct ttm_buffer_object *bo, bool evict)
void amdgpu_bo_get_memory(struct amdgpu_bo *bo,
struct amdgpu_mem_stats *stats)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
struct ttm_resource *res = bo->tbo.resource;
uint64_t size = amdgpu_bo_size(bo);
struct drm_gem_object *obj;
unsigned int domain;
bool shared;
/* Abort if the BO doesn't currently have a backing store */
if (!bo->tbo.resource)
if (!res)
return;
obj = &bo->tbo.base;
shared = drm_gem_object_is_shared_for_memory_stats(obj);
domain = amdgpu_mem_type_to_domain(bo->tbo.resource->mem_type);
domain = amdgpu_mem_type_to_domain(res->mem_type);
switch (domain) {
case AMDGPU_GEM_DOMAIN_VRAM:
stats->vram += size;
if (amdgpu_bo_in_cpu_visible_vram(bo))
if (amdgpu_res_cpu_visible(adev, bo->tbo.resource))
stats->visible_vram += size;
if (shared)
stats->vram_shared += size;
@ -1389,10 +1390,7 @@ vm_fault_t amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
/* Remember that this BO was accessed by the CPU */
abo->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
if (bo->resource->mem_type != TTM_PL_VRAM)
return 0;
if (amdgpu_bo_in_cpu_visible_vram(abo))
if (amdgpu_res_cpu_visible(adev, bo->resource))
return 0;
/* Can't move a pinned BO to visible VRAM */
@ -1415,7 +1413,7 @@ vm_fault_t amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
/* this should never happen */
if (bo->resource->mem_type == TTM_PL_VRAM &&
!amdgpu_bo_in_cpu_visible_vram(abo))
!amdgpu_res_cpu_visible(adev, bo->resource))
return VM_FAULT_SIGBUS;
ttm_bo_move_to_lru_tail_unlocked(bo);
@ -1579,6 +1577,7 @@ uint32_t amdgpu_bo_get_preferred_domain(struct amdgpu_device *adev,
*/
u64 amdgpu_bo_print_info(int id, struct amdgpu_bo *bo, struct seq_file *m)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
struct dma_buf_attachment *attachment;
struct dma_buf *dma_buf;
const char *placement;
@ -1587,10 +1586,11 @@ u64 amdgpu_bo_print_info(int id, struct amdgpu_bo *bo, struct seq_file *m)
if (dma_resv_trylock(bo->tbo.base.resv)) {
unsigned int domain;
domain = amdgpu_mem_type_to_domain(bo->tbo.resource->mem_type);
switch (domain) {
case AMDGPU_GEM_DOMAIN_VRAM:
if (amdgpu_bo_in_cpu_visible_vram(bo))
if (amdgpu_res_cpu_visible(adev, bo->tbo.resource))
placement = "VRAM VISIBLE";
else
placement = "VRAM";

22
drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
View File

@ -250,28 +250,6 @@ static inline u64 amdgpu_bo_mmap_offset(struct amdgpu_bo *bo)
return drm_vma_node_offset_addr(&bo->tbo.base.vma_node);
}
/**
* amdgpu_bo_in_cpu_visible_vram - check if BO is (partly) in visible VRAM
*/
static inline bool amdgpu_bo_in_cpu_visible_vram(struct amdgpu_bo *bo)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
struct amdgpu_res_cursor cursor;
if (!bo->tbo.resource || bo->tbo.resource->mem_type != TTM_PL_VRAM)
return false;
amdgpu_res_first(bo->tbo.resource, 0, amdgpu_bo_size(bo), &cursor);
while (cursor.remaining) {
if (cursor.start < adev->gmc.visible_vram_size)
return true;
amdgpu_res_next(&cursor, cursor.size);
}
return false;
}
/**
* amdgpu_bo_explicit_sync - return whether the bo is explicitly synced
*/

73
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
View File

@ -133,7 +133,7 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
} else if (!amdgpu_gmc_vram_full_visible(&adev->gmc) &&
!(abo->flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) &&
amdgpu_bo_in_cpu_visible_vram(abo)) {
amdgpu_res_cpu_visible(adev, bo->resource)) {
/* Try evicting to the CPU inaccessible part of VRAM
* first, but only set GTT as busy placement, so this
@ -403,40 +403,55 @@ error:
return r;
}
/**
* amdgpu_res_cpu_visible - Check that resource can be accessed by CPU
* @adev: amdgpu device
* @res: the resource to check
*
* Returns: true if the full resource is CPU visible, false otherwise.
*/
bool amdgpu_res_cpu_visible(struct amdgpu_device *adev,
struct ttm_resource *res)
{
struct amdgpu_res_cursor cursor;
if (!res)
return false;
if (res->mem_type == TTM_PL_SYSTEM || res->mem_type == TTM_PL_TT ||
res->mem_type == AMDGPU_PL_PREEMPT)
return true;
if (res->mem_type != TTM_PL_VRAM)
return false;
amdgpu_res_first(res, 0, res->size, &cursor);
while (cursor.remaining) {
if ((cursor.start + cursor.size) >= adev->gmc.visible_vram_size)
return false;
amdgpu_res_next(&cursor, cursor.size);
}
return true;
}
/*
* amdgpu_mem_visible - Check that memory can be accessed by ttm_bo_move_memcpy
* amdgpu_res_copyable - Check that memory can be accessed by ttm_bo_move_memcpy
*
* Called by amdgpu_bo_move()
*/
static bool amdgpu_mem_visible(struct amdgpu_device *adev,
struct ttm_resource *mem)
static bool amdgpu_res_copyable(struct amdgpu_device *adev,
struct ttm_resource *mem)
{
u64 mem_size = (u64)mem->size;
struct amdgpu_res_cursor cursor;
u64 end;
if (mem->mem_type == TTM_PL_SYSTEM ||
mem->mem_type == TTM_PL_TT)
return true;
if (mem->mem_type != TTM_PL_VRAM)
if (!amdgpu_res_cpu_visible(adev, mem))
return false;
amdgpu_res_first(mem, 0, mem_size, &cursor);
end = cursor.start + cursor.size;
while (cursor.remaining) {
amdgpu_res_next(&cursor, cursor.size);
/* ttm_resource_ioremap only supports contiguous memory */
if (mem->mem_type == TTM_PL_VRAM &&
!(mem->placement & TTM_PL_FLAG_CONTIGUOUS))
return false;
if (!cursor.remaining)
break;
/* ttm_resource_ioremap only supports contiguous memory */
if (end != cursor.start)
return false;
end = cursor.start + cursor.size;
}
return end <= adev->gmc.visible_vram_size;
return true;
}
/*
@ -529,8 +544,8 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
if (r) {
/* Check that all memory is CPU accessible */
if (!amdgpu_mem_visible(adev, old_mem) ||
!amdgpu_mem_visible(adev, new_mem)) {
if (!amdgpu_res_copyable(adev, old_mem) ||
!amdgpu_res_copyable(adev, new_mem)) {
pr_err("Move buffer fallback to memcpy unavailable\n");
return r;
}

3
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
View File

@ -139,6 +139,9 @@ int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr,
int amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr *mgr,
uint64_t start);
bool amdgpu_res_cpu_visible(struct amdgpu_device *adev,
struct ttm_resource *res);
int amdgpu_ttm_init(struct amdgpu_device *adev);
void amdgpu_ttm_fini(struct amdgpu_device *adev);
void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev,