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drm/ttm: add ttm_bo_pin()/ttm_bo_unpin() v2

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As an alternative to the placement flag add a
pin count to the ttm buffer object.

v2: add dma_resv_assert_help() calls

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Link: https://patchwork.freedesktop.org/patch/391596/?series=81973&rev=1
This commit is contained in:
Christian König 2020-09-21 13:05:54 +02:00
parent 8e3784dfef
commit deb0814b43
3 changed files with 33 additions and 4 deletions
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9
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -115,7 +115,7 @@ static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
struct ttm_bo_device *bdev = bo->bdev;
struct ttm_resource_manager *man;
if (!list_empty(&bo->lru))
if (!list_empty(&bo->lru) || bo->pin_count)
return;
if (mem->placement & TTM_PL_FLAG_NO_EVICT)
@ -165,7 +165,8 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
ttm_bo_del_from_lru(bo);
ttm_bo_add_mem_to_lru(bo, &bo->mem);
if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT) &&
!bo->pin_count) {
switch (bo->mem.mem_type) {
case TTM_PL_TT:
ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
@ -544,8 +545,9 @@ static void ttm_bo_release(struct kref *kref)
* shrinkers, now that they are queued for
* destruction.
*/
if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT || bo->pin_count) {
bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
bo->pin_count = 0;
ttm_bo_del_from_lru(bo);
ttm_bo_add_mem_to_lru(bo, &bo->mem);
}
@ -1172,6 +1174,7 @@ int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
bo->moving = NULL;
bo->mem.placement = TTM_PL_FLAG_CACHED;
bo->acc_size = acc_size;
bo->pin_count = 0;
bo->sg = sg;
if (resv) {
bo->base.resv = resv;

2
drivers/gpu/drm/ttm/ttm_bo_util.c
View File

@ -352,7 +352,6 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
return -ENOMEM;
fbo->base = *bo;
fbo->base.mem.placement |= TTM_PL_FLAG_NO_EVICT;
ttm_bo_get(bo);
fbo->bo = bo;
@ -372,6 +371,7 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
kref_init(&fbo->base.kref);
fbo->base.destroy = &ttm_transfered_destroy;
fbo->base.acc_size = 0;
fbo->base.pin_count = 1;
if (bo->type != ttm_bo_type_sg)
fbo->base.base.resv = &fbo->base.base._resv;

26
include/drm/ttm/ttm_bo_api.h
View File

@ -153,6 +153,7 @@ struct ttm_buffer_object {
struct dma_fence *moving;
unsigned priority;
unsigned pin_count;
/**
* Special members that are protected by the reserve lock
@ -607,6 +608,31 @@ static inline bool ttm_bo_uses_embedded_gem_object(struct ttm_buffer_object *bo)
return bo->base.dev != NULL;
}
/**
* ttm_bo_pin - Pin the buffer object.
* @bo: The buffer object to pin
*
* Make sure the buffer is not evicted any more during memory pressure.
*/
static inline void ttm_bo_pin(struct ttm_buffer_object *bo)
{
dma_resv_assert_held(bo->base.resv);
++bo->pin_count;
}
/**
* ttm_bo_unpin - Unpin the buffer object.
* @bo: The buffer object to unpin
*
* Allows the buffer object to be evicted again during memory pressure.
*/
static inline void ttm_bo_unpin(struct ttm_buffer_object *bo)
{
dma_resv_assert_held(bo->base.resv);
WARN_ON_ONCE(!bo->pin_count);
--bo->pin_count;
}
int ttm_mem_evict_first(struct ttm_bo_device *bdev,
struct ttm_resource_manager *man,
const struct ttm_place *place,