RE: [PATCH 1/2] drm/ttm: cleanup ttm_mem_type_manager_func.get_node interface v2
>-Original Message-
>From: dri-devel On Behalf Of
>Christian König
>Sent: Monday, June 29, 2020 8:22 AM
>To: dri-devel@lists.freedesktop.org
>Subject: [PATCH 1/2] drm/ttm: cleanup
>ttm_mem_type_manager_func.get_node interface v2
>
>Instead of signaling failure by setting the node pointer to
>NULL do so by returning -ENOSPC.
>
>v2: add memset() to make sure that mem is always initialized.
>
>Signed-off-by: Christian König
>---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 4 +---
> drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 5 ++---
> drivers/gpu/drm/nouveau/nouveau_ttm.c | 8
> drivers/gpu/drm/ttm/ttm_bo.c | 12 ++--
> drivers/gpu/drm/ttm/ttm_bo_manager.c | 2 +-
> drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c | 4 +---
> 6 files changed, 11 insertions(+), 24 deletions(-)
>
>diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
>b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
>index 627104401e84..2baa80224fa4 100644
>--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
>+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
>@@ -229,7 +229,7 @@ static int amdgpu_gtt_mgr_new(struct
>ttm_mem_type_manager *man,
> if ((>mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
> atomic64_read(>available) < mem->num_pages) {
> spin_unlock(>lock);
>- return 0;
>+ return -ENOSPC;
> }
> atomic64_sub(mem->num_pages, >available);
> spin_unlock(>lock);
>@@ -249,8 +249,6 @@ static int amdgpu_gtt_mgr_new(struct
>ttm_mem_type_manager *man,
> r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
> if (unlikely(r)) {
> kfree(node);
>- mem->mm_node = NULL;
>- r = 0;
I think that this one is still a problem. The code path sets:
mem->mm_node = node;
(about 3 lines above this chunk, and then calls
amdgpu_gtt_mgr_malloc()
If amdgpu_gtt_mgr_malloc() fails, mm_node is still set. I think you need to
keep
this mm_node = NULL setting, or the path needs to be modified to not set
mm_node.
> goto err_out;
> }
> } else {
>diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>index 128a667ed8fa..e8d1dd564006 100644
>--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
>@@ -336,8 +336,7 @@ static int amdgpu_vram_mgr_new(struct
>ttm_mem_type_manager *man,
> mem_bytes = (u64)mem->num_pages << PAGE_SHIFT;
> if (atomic64_add_return(mem_bytes, >usage) > max_bytes) {
> atomic64_sub(mem_bytes, >usage);
>- mem->mm_node = NULL;
>- return 0;
>+ return -ENOSPC;
> }
>
> if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
>@@ -417,7 +416,7 @@ static int amdgpu_vram_mgr_new(struct
>ttm_mem_type_manager *man,
> atomic64_sub(mem->num_pages << PAGE_SHIFT, >usage);
>
> kvfree(nodes);
>- return r == -ENOSPC ? 0 : r;
>+ return r;
> }
>
> /**
>diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.c
>b/drivers/gpu/drm/nouveau/nouveau_ttm.c
>index 7ca0a2498532..e89ea052cf71 100644
>--- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
>+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
>@@ -75,10 +75,6 @@ nouveau_vram_manager_new(struct
>ttm_mem_type_manager *man,
> ret = nouveau_mem_vram(reg, nvbo->contig, nvbo->page);
> if (ret) {
> nouveau_mem_del(reg);
>- if (ret == -ENOSPC) {
>- reg->mm_node = NULL;
>- return 0;
>- }
> return ret;
> }
>
>@@ -139,10 +135,6 @@ nv04_gart_manager_new(struct
>ttm_mem_type_manager *man,
> reg->num_pages << PAGE_SHIFT, >vma[0]);
> if (ret) {
> nouveau_mem_del(reg);
>- if (ret == -ENOSPC) {
>- reg->mm_node = NULL;
>- return 0;
>- }
> return ret;
> }
>
>diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
>index f78cfc76ad78..06b8bc0d8f23 100644
>--- a/drivers/gpu/drm/ttm/ttm_bo.c
>+++ b/drivers/gpu/drm/ttm/ttm_bo.c
>@@ -909,10 +909,10 @@ static int ttm_bo_mem_force_space(struct
>ttm_buffer_object *bo,
> ticket = dma_resv_locking_ctx(bo->base.resv);
> do {
> ret = (*man->func->get_node)(man, bo, place, mem);
>- if (unlikely(ret != 0))
>-
[PATCH 1/2] drm/ttm: cleanup ttm_mem_type_manager_func.get_node interface v2
Instead of signaling failure by setting the node pointer to
NULL do so by returning -ENOSPC.
v2: add memset() to make sure that mem is always initialized.
Signed-off-by: Christian König
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 4 +---
drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 5 ++---
drivers/gpu/drm/nouveau/nouveau_ttm.c | 8
drivers/gpu/drm/ttm/ttm_bo.c | 12 ++--
drivers/gpu/drm/ttm/ttm_bo_manager.c | 2 +-
drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c | 4 +---
6 files changed, 11 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
index 627104401e84..2baa80224fa4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
@@ -229,7 +229,7 @@ static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager
*man,
if ((>mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
atomic64_read(>available) < mem->num_pages) {
spin_unlock(>lock);
- return 0;
+ return -ENOSPC;
}
atomic64_sub(mem->num_pages, >available);
spin_unlock(>lock);
@@ -249,8 +249,6 @@ static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager
*man,
r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
if (unlikely(r)) {
kfree(node);
- mem->mm_node = NULL;
- r = 0;
goto err_out;
}
} else {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index 128a667ed8fa..e8d1dd564006 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -336,8 +336,7 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager
*man,
mem_bytes = (u64)mem->num_pages << PAGE_SHIFT;
if (atomic64_add_return(mem_bytes, >usage) > max_bytes) {
atomic64_sub(mem_bytes, >usage);
- mem->mm_node = NULL;
- return 0;
+ return -ENOSPC;
}
if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
@@ -417,7 +416,7 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager
*man,
atomic64_sub(mem->num_pages << PAGE_SHIFT, >usage);
kvfree(nodes);
- return r == -ENOSPC ? 0 : r;
+ return r;
}
/**
diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.c
b/drivers/gpu/drm/nouveau/nouveau_ttm.c
index 7ca0a2498532..e89ea052cf71 100644
--- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
@@ -75,10 +75,6 @@ nouveau_vram_manager_new(struct ttm_mem_type_manager *man,
ret = nouveau_mem_vram(reg, nvbo->contig, nvbo->page);
if (ret) {
nouveau_mem_del(reg);
- if (ret == -ENOSPC) {
- reg->mm_node = NULL;
- return 0;
- }
return ret;
}
@@ -139,10 +135,6 @@ nv04_gart_manager_new(struct ttm_mem_type_manager *man,
reg->num_pages << PAGE_SHIFT, >vma[0]);
if (ret) {
nouveau_mem_del(reg);
- if (ret == -ENOSPC) {
- reg->mm_node = NULL;
- return 0;
- }
return ret;
}
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index f78cfc76ad78..06b8bc0d8f23 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -909,10 +909,10 @@ static int ttm_bo_mem_force_space(struct
ttm_buffer_object *bo,
ticket = dma_resv_locking_ctx(bo->base.resv);
do {
ret = (*man->func->get_node)(man, bo, place, mem);
- if (unlikely(ret != 0))
- return ret;
- if (mem->mm_node)
+ if (likely(!ret))
break;
+ if (unlikely(ret != -ENOSPC))
+ return ret;
ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
ticket);
if (unlikely(ret != 0))
@@ -1056,12 +1056,11 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
man = >man[mem->mem_type];
ret = (*man->func->get_node)(man, bo, place, mem);
+ if (ret == -ENOSPC)
+ continue;
if (unlikely(ret))
goto error;
- if (!mem->mm_node)
- continue;
-
ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
if (unlikely(ret)) {
(*man->func->put_node)(man, mem);
@@ -1121,6 +1120,7 @@ static int ttm_bo_move_buffer(struct ttm_buffer_object
*bo,
