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Two fixes for TTM, one for a NULL pointer dereference and one to make sure 

the buffer is pinned prior to a bulk move, and a fix for a spurious
 compiler warning.
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Merge tag 'drm-misc-fixes-2022-06-16' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

Two fixes for TTM, one for a NULL pointer dereference and one to make sure
the buffer is pinned prior to a bulk move, and a fix for a spurious
compiler warning.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220616072519.qwrsefsemejefowu@houat
This commit is contained in:
Dave Airlie 2022-06-17 09:31:22 +10:00
parent b13baccc38 0f9cd1ea10
commit 2f90ec1271
5 changed files with 60 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -109,11 +109,11 @@ void ttm_bo_set_bulk_move(struct ttm_buffer_object *bo,
return;
spin_lock(&bo->bdev->lru_lock);
if (bo->bulk_move && bo->resource)
ttm_lru_bulk_move_del(bo->bulk_move, bo->resource);
if (bo->resource)
ttm_resource_del_bulk_move(bo->resource, bo);
bo->bulk_move = bulk;
if (bo->bulk_move && bo->resource)
ttm_lru_bulk_move_add(bo->bulk_move, bo->resource);
if (bo->resource)
ttm_resource_add_bulk_move(bo->resource, bo);
spin_unlock(&bo->bdev->lru_lock);
}
EXPORT_SYMBOL(ttm_bo_set_bulk_move);
@ -689,8 +689,11 @@ void ttm_bo_pin(struct ttm_buffer_object *bo)
{
dma_resv_assert_held(bo->base.resv);
WARN_ON_ONCE(!kref_read(&bo->kref));
if (!(bo->pin_count++) && bo->bulk_move && bo->resource)
ttm_lru_bulk_move_del(bo->bulk_move, bo->resource);
spin_lock(&bo->bdev->lru_lock);
if (bo->resource)
ttm_resource_del_bulk_move(bo->resource, bo);
++bo->pin_count;
spin_unlock(&bo->bdev->lru_lock);
}
EXPORT_SYMBOL(ttm_bo_pin);
@ -707,8 +710,11 @@ void ttm_bo_unpin(struct ttm_buffer_object *bo)
if (WARN_ON_ONCE(!bo->pin_count))
return;
if (!(--bo->pin_count) && bo->bulk_move && bo->resource)
ttm_lru_bulk_move_add(bo->bulk_move, bo->resource);
spin_lock(&bo->bdev->lru_lock);
--bo->pin_count;
if (bo->resource)
ttm_resource_add_bulk_move(bo->resource, bo);
spin_unlock(&bo->bdev->lru_lock);
}
EXPORT_SYMBOL(ttm_bo_unpin);

6
drivers/gpu/drm/ttm/ttm_device.c
View File

@ -156,8 +156,12 @@ int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
ttm_resource_manager_for_each_res(man, &cursor, res) {
struct ttm_buffer_object *bo = res->bo;
uint32_t num_pages = PFN_UP(bo->base.size);
uint32_t num_pages;
if (!bo)
continue;
num_pages = PFN_UP(bo->base.size);
ret = ttm_bo_swapout(bo, ctx, gfp_flags);
/* ttm_bo_swapout has dropped the lru_lock */
if (!ret)

52
drivers/gpu/drm/ttm/ttm_resource.c
View File

@ -91,8 +91,8 @@ static void ttm_lru_bulk_move_pos_tail(struct ttm_lru_bulk_move_pos *pos,
}
/* Add the resource to a bulk_move cursor */
void ttm_lru_bulk_move_add(struct ttm_lru_bulk_move *bulk,
struct ttm_resource *res)
static void ttm_lru_bulk_move_add(struct ttm_lru_bulk_move *bulk,
struct ttm_resource *res)
{
struct ttm_lru_bulk_move_pos *pos = ttm_lru_bulk_move_pos(bulk, res);
@ -105,8 +105,8 @@ void ttm_lru_bulk_move_add(struct ttm_lru_bulk_move *bulk,
}
/* Remove the resource from a bulk_move range */
void ttm_lru_bulk_move_del(struct ttm_lru_bulk_move *bulk,
struct ttm_resource *res)
static void ttm_lru_bulk_move_del(struct ttm_lru_bulk_move *bulk,
struct ttm_resource *res)
{
struct ttm_lru_bulk_move_pos *pos = ttm_lru_bulk_move_pos(bulk, res);
@ -122,6 +122,22 @@ void ttm_lru_bulk_move_del(struct ttm_lru_bulk_move *bulk,
}
}
/* Add the resource to a bulk move if the BO is configured for it */
void ttm_resource_add_bulk_move(struct ttm_resource *res,
struct ttm_buffer_object *bo)
{
if (bo->bulk_move && !bo->pin_count)
ttm_lru_bulk_move_add(bo->bulk_move, res);
}
/* Remove the resource from a bulk move if the BO is configured for it */
void ttm_resource_del_bulk_move(struct ttm_resource *res,
struct ttm_buffer_object *bo)
{
if (bo->bulk_move && !bo->pin_count)
ttm_lru_bulk_move_del(bo->bulk_move, res);
}
/* Move a resource to the LRU or bulk tail */
void ttm_resource_move_to_lru_tail(struct ttm_resource *res)
{
@ -169,15 +185,14 @@ void ttm_resource_init(struct ttm_buffer_object *bo,
res->bus.is_iomem = false;
res->bus.caching = ttm_cached;
res->bo = bo;
INIT_LIST_HEAD(&res->lru);
man = ttm_manager_type(bo->bdev, place->mem_type);
spin_lock(&bo->bdev->lru_lock);
man->usage += res->num_pages << PAGE_SHIFT;
if (bo->bulk_move)
ttm_lru_bulk_move_add(bo->bulk_move, res);
if (bo->pin_count)
list_add_tail(&res->lru, &bo->bdev->pinned);
else
ttm_resource_move_to_lru_tail(res);
list_add_tail(&res->lru, &man->lru[bo->priority]);
man->usage += res->num_pages << PAGE_SHIFT;
spin_unlock(&bo->bdev->lru_lock);
}
EXPORT_SYMBOL(ttm_resource_init);
@ -210,8 +225,16 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
{
struct ttm_resource_manager *man =
ttm_manager_type(bo->bdev, place->mem_type);
int ret;
return man->func->alloc(man, bo, place, res_ptr);
ret = man->func->alloc(man, bo, place, res_ptr);
if (ret)
return ret;
spin_lock(&bo->bdev->lru_lock);
ttm_resource_add_bulk_move(*res_ptr, bo);
spin_unlock(&bo->bdev->lru_lock);
return 0;
}
void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res)
@ -221,12 +244,9 @@ void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res)
if (!*res)
return;
if (bo->bulk_move) {
spin_lock(&bo->bdev->lru_lock);
ttm_lru_bulk_move_del(bo->bulk_move, *res);
spin_unlock(&bo->bdev->lru_lock);
}
spin_lock(&bo->bdev->lru_lock);
ttm_resource_del_bulk_move(*res, bo);
spin_unlock(&bo->bdev->lru_lock);
man = ttm_manager_type(bo->bdev, (*res)->mem_type);
man->func->free(man, *res);
*res = NULL;

1
include/drm/drm_atomic.h
View File

@ -1022,6 +1022,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
for ((__i) = 0; \
(__i) < (__state)->num_private_objs && \
((obj) = (__state)->private_objs[__i].ptr, \
(void)(obj) /* Only to avoid unused-but-set-variable warning */, \
(new_obj_state) = (__state)->private_objs[__i].new_state, 1); \
(__i)++)

8
include/drm/ttm/ttm_resource.h
View File

@ -311,12 +311,12 @@ ttm_resource_manager_cleanup(struct ttm_resource_manager *man)
}
void ttm_lru_bulk_move_init(struct ttm_lru_bulk_move *bulk);
void ttm_lru_bulk_move_add(struct ttm_lru_bulk_move *bulk,
struct ttm_resource *res);
void ttm_lru_bulk_move_del(struct ttm_lru_bulk_move *bulk,
struct ttm_resource *res);
void ttm_lru_bulk_move_tail(struct ttm_lru_bulk_move *bulk);
void ttm_resource_add_bulk_move(struct ttm_resource *res,
struct ttm_buffer_object *bo);
void ttm_resource_del_bulk_move(struct ttm_resource *res,
struct ttm_buffer_object *bo);
void ttm_resource_move_to_lru_tail(struct ttm_resource *res);
void ttm_resource_init(struct ttm_buffer_object *bo,