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dma-buf: add more reservation object locking wrappers 

Complete the abstraction of the ww_mutex inside the reservation object.

This allows us to add more handling and debugging to the reservation
object in the future.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/320761/
This commit is contained in:
Christian König 2019-07-31 09:41:50 +02:00
parent 05103ea9a3
commit 0dbd555a01
16 changed files with 100 additions and 40 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

@ -1729,7 +1729,7 @@ int amdgpu_cs_find_mapping(struct amdgpu_cs_parser *parser,
*map = mapping;
/* Double check that the BO is reserved by this CS */
if (READ_ONCE((*bo)->tbo.resv->lock.ctx) != &parser->ticket)
if (reservation_object_locking_ctx((*bo)->tbo.resv) != &parser->ticket)
return -EINVAL;
if (!((*bo)->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS)) {

6
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
View File

@ -380,7 +380,7 @@ amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
bp.flags = 0;
bp.type = ttm_bo_type_sg;
bp.resv = resv;
ww_mutex_lock(&resv->lock, NULL);
reservation_object_lock(resv, NULL);
ret = amdgpu_bo_create(adev, &bp, &bo);
if (ret)
goto error;
@ -392,11 +392,11 @@ amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
if (attach->dmabuf->ops != &amdgpu_dmabuf_ops)
bo->prime_shared_count = 1;
ww_mutex_unlock(&resv->lock);
reservation_object_unlock(resv);
return &bo->gem_base;
error:
ww_mutex_unlock(&resv->lock);
reservation_object_unlock(resv);
return ERR_PTR(ret);
}

6
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
View File

@ -546,7 +546,7 @@ static int amdgpu_bo_do_create(struct amdgpu_device *adev,
fail_unreserve:
if (!bp->resv)
ww_mutex_unlock(&bo->tbo.resv->lock);
reservation_object_unlock(bo->tbo.resv);
amdgpu_bo_unref(&bo);
return r;
}
@ -1089,7 +1089,7 @@ int amdgpu_bo_set_tiling_flags(struct amdgpu_bo *bo, u64 tiling_flags)
*/
void amdgpu_bo_get_tiling_flags(struct amdgpu_bo *bo, u64 *tiling_flags)
{
lockdep_assert_held(&bo->tbo.resv->lock.base);
reservation_object_assert_held(bo->tbo.resv);
if (tiling_flags)
*tiling_flags = bo->tiling_flags;
@ -1330,7 +1330,7 @@ int amdgpu_bo_sync_wait(struct amdgpu_bo *bo, void *owner, bool intr)
u64 amdgpu_bo_gpu_offset(struct amdgpu_bo *bo)
{
WARN_ON_ONCE(bo->tbo.mem.mem_type == TTM_PL_SYSTEM);
WARN_ON_ONCE(!ww_mutex_is_locked(&bo->tbo.resv->lock) &&
WARN_ON_ONCE(!reservation_object_is_locked(bo->tbo.resv) &&
!bo->pin_count && bo->tbo.type != ttm_bo_type_kernel);
WARN_ON_ONCE(bo->tbo.mem.start == AMDGPU_BO_INVALID_OFFSET);
WARN_ON_ONCE(bo->tbo.mem.mem_type == TTM_PL_VRAM &&

3
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
View File

@ -2416,7 +2416,8 @@ void amdgpu_vm_bo_trace_cs(struct amdgpu_vm *vm, struct ww_acquire_ctx *ticket)
struct amdgpu_bo *bo;
bo = mapping->bo_va->base.bo;
if (READ_ONCE(bo->tbo.resv->lock.ctx) != ticket)
if (reservation_object_locking_ctx(bo->tbo.resv) !=
ticket)
continue;
}

14
drivers/gpu/drm/drm_gem.c
View File

@ -1288,8 +1288,8 @@ retry:
if (contended != -1) {
struct drm_gem_object *obj = objs[contended];
ret = ww_mutex_lock_slow_interruptible(&obj->resv->lock,
acquire_ctx);
ret = reservation_object_lock_slow_interruptible(obj->resv,
acquire_ctx);
if (ret) {
ww_acquire_done(acquire_ctx);
return ret;
@ -1300,16 +1300,16 @@ retry:
if (i == contended)
continue;
ret = ww_mutex_lock_interruptible(&objs[i]->resv->lock,
acquire_ctx);
ret = reservation_object_lock_interruptible(objs[i]->resv,
acquire_ctx);
if (ret) {
int j;
for (j = 0; j < i; j++)
ww_mutex_unlock(&objs[j]->resv->lock);
reservation_object_unlock(objs[j]->resv);
if (contended != -1 && contended >= i)
ww_mutex_unlock(&objs[contended]->resv->lock);
reservation_object_unlock(objs[contended]->resv);
if (ret == -EDEADLK) {
contended = i;
@ -1334,7 +1334,7 @@ drm_gem_unlock_reservations(struct drm_gem_object **objs, int count,
int i;
for (i = 0; i < count; i++)
ww_mutex_unlock(&objs[i]->resv->lock);
reservation_object_unlock(objs[i]->resv);
ww_acquire_fini(acquire_ctx);
}

4
drivers/gpu/drm/nouveau/nouveau_prime.c
View File

@ -68,10 +68,10 @@ struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
flags = TTM_PL_FLAG_TT;
ww_mutex_lock(&robj->lock, NULL);
reservation_object_lock(robj, NULL);
ret = nouveau_bo_new(&drm->client, attach->dmabuf->size, 0, flags, 0, 0,
sg, robj, &nvbo);
ww_mutex_unlock(&robj->lock);
reservation_object_unlock(robj);
if (ret)
return ERR_PTR(ret);

6
drivers/gpu/drm/radeon/radeon_object.c
View File

@ -611,7 +611,7 @@ int radeon_bo_get_surface_reg(struct radeon_bo *bo)
int steal;
int i;
lockdep_assert_held(&bo->tbo.resv->lock.base);
reservation_object_assert_held(bo->tbo.resv);
if (!bo->tiling_flags)
return 0;
@ -737,7 +737,7 @@ void radeon_bo_get_tiling_flags(struct radeon_bo *bo,
uint32_t *tiling_flags,
uint32_t *pitch)
{
lockdep_assert_held(&bo->tbo.resv->lock.base);
reservation_object_assert_held(bo->tbo.resv);
if (tiling_flags)
*tiling_flags = bo->tiling_flags;
@ -749,7 +749,7 @@ int radeon_bo_check_tiling(struct radeon_bo *bo, bool has_moved,
bool force_drop)
{
if (!force_drop)
lockdep_assert_held(&bo->tbo.resv->lock.base);
reservation_object_assert_held(bo->tbo.resv);
if (!(bo->tiling_flags & RADEON_TILING_SURFACE))
return 0;

4
drivers/gpu/drm/radeon/radeon_prime.c
View File

@ -68,10 +68,10 @@ struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
struct radeon_bo *bo;
int ret;
ww_mutex_lock(&resv->lock, NULL);
reservation_object_lock(resv, NULL);
ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
ww_mutex_unlock(&resv->lock);
reservation_object_unlock(resv);
if (ret)
return ERR_PTR(ret);

10
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -850,8 +850,8 @@ static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
&busy)) {
if (busy && !busy_bo &&
bo->resv->lock.ctx != ticket)
if (busy && !busy_bo && ticket !=
reservation_object_locking_ctx(bo->resv))
busy_bo = bo;
continue;
}
@ -957,8 +957,10 @@ static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
{
struct ttm_bo_device *bdev = bo->bdev;
struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
struct ww_acquire_ctx *ticket;
int ret;
ticket = reservation_object_locking_ctx(bo->resv);
do {
ret = (*man->func->get_node)(man, bo, place, mem);
if (unlikely(ret != 0))
@ -966,7 +968,7 @@ static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
if (mem->mm_node)
break;
ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
bo->resv->lock.ctx);
ticket);
if (unlikely(ret != 0))
return ret;
} while (1);
@ -1963,7 +1965,7 @@ int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
ret = mutex_lock_interruptible(&bo->wu_mutex);
if (unlikely(ret != 0))
return -ERESTARTSYS;
if (!ww_mutex_is_locked(&bo->resv->lock))
if (!reservation_object_is_locked(bo->resv))
goto out_unlock;
ret = reservation_object_lock_interruptible(bo->resv, NULL);
if (ret == -EINTR)

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

@ -144,10 +144,10 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
if (ret == -EDEADLK) {
if (intr) {
ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
ticket);
ret = reservation_object_lock_slow_interruptible(bo->resv,
ticket);
} else {
ww_mutex_lock_slow(&bo->resv->lock, ticket);
reservation_object_lock_slow(bo->resv, ticket);
ret = 0;
}
}

4
drivers/gpu/drm/vmwgfx/vmwgfx_blit.c
View File

@ -459,9 +459,9 @@ int vmw_bo_cpu_blit(struct ttm_buffer_object *dst,
/* Buffer objects need to be either pinned or reserved: */
if (!(dst->mem.placement & TTM_PL_FLAG_NO_EVICT))
lockdep_assert_held(&dst->resv->lock.base);
reservation_object_assert_held(dst->resv);
if (!(src->mem.placement & TTM_PL_FLAG_NO_EVICT))
lockdep_assert_held(&src->resv->lock.base);
reservation_object_assert_held(src->resv);
if (dst->ttm->state == tt_unpopulated) {
ret = dst->ttm->bdev->driver->ttm_tt_populate(dst->ttm, &ctx);

2
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
View File

@ -342,7 +342,7 @@ void vmw_bo_pin_reserved(struct vmw_buffer_object *vbo, bool pin)
uint32_t old_mem_type = bo->mem.mem_type;
int ret;
lockdep_assert_held(&bo->resv->lock.base);
reservation_object_assert_held(bo->resv);
if (pin) {
if (vbo->pin_count++ > 0)

4
drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c
View File

@ -169,7 +169,7 @@ static int vmw_cotable_unscrub(struct vmw_resource *res)
} *cmd;
WARN_ON_ONCE(bo->mem.mem_type != VMW_PL_MOB);
lockdep_assert_held(&bo->resv->lock.base);
reservation_object_assert_held(bo->resv);
cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
if (!cmd)
@ -311,7 +311,7 @@ static int vmw_cotable_unbind(struct vmw_resource *res,
return 0;
WARN_ON_ONCE(bo->mem.mem_type != VMW_PL_MOB);
lockdep_assert_held(&bo->resv->lock.base);
reservation_object_assert_held(bo->resv);
mutex_lock(&dev_priv->binding_mutex);
if (!vcotbl->scrubbed)

6
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
View File

@ -402,14 +402,14 @@ void vmw_resource_unreserve(struct vmw_resource *res,
if (switch_backup && new_backup != res->backup) {
if (res->backup) {
lockdep_assert_held(&res->backup->base.resv->lock.base);
reservation_object_assert_held(res->backup->base.resv);
list_del_init(&res->mob_head);
vmw_bo_unreference(&res->backup);
}
if (new_backup) {
res->backup = vmw_bo_reference(new_backup);
lockdep_assert_held(&new_backup->base.resv->lock.base);
reservation_object_assert_held(new_backup->base.resv);
list_add_tail(&res->mob_head, &new_backup->res_list);
} else {
res->backup = NULL;
@ -691,7 +691,7 @@ void vmw_resource_unbind_list(struct vmw_buffer_object *vbo)
.num_shared = 0
};
lockdep_assert_held(&vbo->base.resv->lock.base);
reservation_object_assert_held(vbo->base.resv);
list_for_each_entry_safe(res, next, &vbo->res_list, mob_head) {
if (!res->func->unbind)
continue;

6
include/drm/ttm/ttm_bo_driver.h
View File

@ -745,10 +745,10 @@ static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
WARN_ON(!kref_read(&bo->kref));
if (interruptible)
ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
ticket);
ret = reservation_object_lock_slow_interruptible(bo->resv,
ticket);
else
ww_mutex_lock_slow(&bo->resv->lock, ticket);
reservation_object_lock_slow(bo->resv, ticket);
if (likely(ret == 0))
ttm_bo_del_sub_from_lru(bo);

57
include/linux/reservation.h
View File

@ -140,6 +140,38 @@ reservation_object_lock_interruptible(struct reservation_object *obj,
return ww_mutex_lock_interruptible(&obj->lock, ctx);
}
/**
* reservation_object_lock_slow - slowpath lock the reservation object
* @obj: the reservation object
* @ctx: the locking context
*
* Acquires the reservation object after a die case. This function
* will sleep until the lock becomes available. See reservation_object_lock() as
* well.
*/
static inline void
reservation_object_lock_slow(struct reservation_object *obj,
struct ww_acquire_ctx *ctx)
{
ww_mutex_lock_slow(&obj->lock, ctx);
}
/**
* reservation_object_lock_slow_interruptible - slowpath lock the reservation
* object, interruptible
* @obj: the reservation object
* @ctx: the locking context
*
* Acquires the reservation object interruptible after a die case. This function
* will sleep until the lock becomes available. See
* reservation_object_lock_interruptible() as well.
*/
static inline int
reservation_object_lock_slow_interruptible(struct reservation_object *obj,
struct ww_acquire_ctx *ctx)
{
return ww_mutex_lock_slow_interruptible(&obj->lock, ctx);
}
/**
* reservation_object_trylock - trylock the reservation object
@ -161,6 +193,31 @@ reservation_object_trylock(struct reservation_object *obj)
return ww_mutex_trylock(&obj->lock);
}
/**
* reservation_object_is_locked - is the reservation object locked
* @obj: the reservation object
*
* Returns true if the mutex is locked, false if unlocked.
*/
static inline bool
reservation_object_is_locked(struct reservation_object *obj)
{
return ww_mutex_is_locked(&obj->lock);
}
/**
* reservation_object_locking_ctx - returns the context used to lock the object
* @obj: the reservation object
*
* Returns the context used to lock a reservation object or NULL if no context
* was used or the object is not locked at all.
*/
static inline struct ww_acquire_ctx *
reservation_object_locking_ctx(struct reservation_object *obj)
{
return READ_ONCE(obj->lock.ctx);
}
/**
* reservation_object_unlock - unlock the reservation object
* @obj: the reservation object