From: Christian König <christian.koenig@xxxxxxx>
This feature is only used by vmwgfx and superfluous for everybody else.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Co-developed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Tested-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 27 ------------------
drivers/gpu/drm/ttm/ttm_bo_util.c | 1 -
drivers/gpu/drm/ttm/ttm_execbuf_util.c | 7 +----
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 17 ++++++++----
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 3 ++
drivers/gpu/drm/vmwgfx/vmwgfx_validation.c | 3 ++
include/drm/ttm/ttm_bo_api.h | 32 ----------------------
7 files changed, 19 insertions(+), 71 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 20ff56f27aa4..a1201729cc53 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -153,7 +153,6 @@ static void ttm_bo_release_list(struct kref *list_kref)
BUG_ON(kref_read(&bo->list_kref));
BUG_ON(kref_read(&bo->kref));
- BUG_ON(atomic_read(&bo->cpu_writers));
BUG_ON(bo->mem.mm_node != NULL);
BUG_ON(!list_empty(&bo->lru));
BUG_ON(!list_empty(&bo->ddestroy));
@@ -1314,7 +1313,6 @@ int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
kref_init(&bo->kref);
kref_init(&bo->list_kref);
- atomic_set(&bo->cpu_writers, 0);
INIT_LIST_HEAD(&bo->lru);
INIT_LIST_HEAD(&bo->ddestroy);
INIT_LIST_HEAD(&bo->swap);
@@ -1826,31 +1824,6 @@ int ttm_bo_wait(struct ttm_buffer_object *bo,
}
EXPORT_SYMBOL(ttm_bo_wait);
-int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
-{
- int ret = 0;
-
- /*
- * Using ttm_bo_reserve makes sure the lru lists are updated.
- */
-
- ret = ttm_bo_reserve(bo, true, no_wait, NULL);
- if (unlikely(ret != 0))
- return ret;
- ret = ttm_bo_wait(bo, true, no_wait);
- if (likely(ret == 0))
- atomic_inc(&bo->cpu_writers);
- ttm_bo_unreserve(bo);
- return ret;
-}
-EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
-
-void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
-{
- atomic_dec(&bo->cpu_writers);
-}
-EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
-
/**
* A buffer object shrink method that tries to swap out the first
* buffer object on the bo_global::swap_lru list.
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index fe81c565e7ef..b00039dcb487 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -511,7 +511,6 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
mutex_init(&fbo->base.wu_mutex);
fbo->base.moving = NULL;
drm_vma_node_reset(&fbo->base.base.vma_node);
- atomic_set(&fbo->base.cpu_writers, 0);
kref_init(&fbo->base.list_kref);
kref_init(&fbo->base.kref);
diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index 131dae8f4170..0519e1b5a49c 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -113,12 +113,7 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
struct ttm_buffer_object *bo = entry->bo;
ret = __ttm_bo_reserve(bo, intr, (ticket == NULL), ticket);
- if (!ret && unlikely(atomic_read(&bo->cpu_writers) > 0)) {
- dma_resv_unlock(bo->base.resv);
-
- ret = -EBUSY;
-
- } else if (ret == -EALREADY && dups) {
+ if (ret == -EALREADY && dups) {
struct ttm_validate_buffer *safe = entry;
entry = list_prev_entry(entry, head);
list_del(&safe->head);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index aad8d8140259..74016a08d118 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -566,7 +566,7 @@ static void vmw_user_bo_ref_obj_release(struct ttm_base_object *base,
switch (ref_type) {
case TTM_REF_SYNCCPU_WRITE:
- ttm_bo_synccpu_write_release(&user_bo->vbo.base);
+ atomic_dec(&user_bo->vbo.cpu_writers);
break;
default:
WARN_ONCE(true, "Undefined buffer object reference release.\n");
@@ -682,12 +682,12 @@ static int vmw_user_bo_synccpu_grab(struct vmw_user_buffer_object *user_bo,
struct ttm_object_file *tfile,
uint32_t flags)
{
+ bool nonblock = !!(flags & drm_vmw_synccpu_dontblock);
struct ttm_buffer_object *bo = &user_bo->vbo.base;
bool existed;
int ret;
if (flags & drm_vmw_synccpu_allow_cs) {
- bool nonblock = !!(flags & drm_vmw_synccpu_dontblock);
long lret;
lret = dma_resv_wait_timeout_rcu
@@ -700,15 +700,22 @@ static int vmw_user_bo_synccpu_grab(struct vmw_user_buffer_object *user_bo,
return 0;
}
- ret = ttm_bo_synccpu_write_grab
- (bo, !!(flags & drm_vmw_synccpu_dontblock));
+ ret = ttm_bo_reserve(bo, true, nonblock, NULL);
+ if (unlikely(ret != 0))
+ return ret;
+
+ ret = ttm_bo_wait(bo, true, nonblock);
+ if (likely(ret == 0))
+ atomic_inc(&user_bo->vbo.cpu_writers);
+
+ ttm_bo_unreserve(bo);
if (unlikely(ret != 0))
return ret;
ret = ttm_ref_object_add(tfile, &user_bo->prime.base,
TTM_REF_SYNCCPU_WRITE, &existed, false);
if (ret != 0 || existed)
- ttm_bo_synccpu_write_release(&user_bo->vbo.base);
+ atomic_dec(&user_bo->vbo.cpu_writers);
return ret;
}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 5eb73ded8e07..c7c6f1e42340 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -102,6 +102,8 @@ struct vmw_fpriv {
* @base: The TTM buffer object
* @res_list: List of resources using this buffer object as a backing MOB
* @pin_count: pin depth
+ * @cpu_writers: Number of synccpu write grabs. Protected by reservation when
+ * increased. May be decreased without reservation.
* @dx_query_ctx: DX context if this buffer object is used as a DX query MOB
* @map: Kmap object for semi-persistent mappings
* @res_prios: Eviction priority counts for attached resources
@@ -110,6 +112,7 @@ struct vmw_buffer_object {
struct ttm_buffer_object base;
struct list_head res_list;
s32 pin_count;
+ atomic_t cpu_writers;
/* Not ref-counted. Protected by binding_mutex */
struct vmw_resource *dx_query_ctx;
/* Protected by reservation */
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c
index f611b2290a1b..7bff3628fc54 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c
@@ -521,6 +521,9 @@ int vmw_validation_bo_validate_single(struct ttm_buffer_object *bo,
};
int ret;
+ if (atomic_read(&vbo->cpu_writers))
+ return -EBUSY;
+
if (vbo->pin_count > 0)
return 0;
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 43c4929a2171..08a5c1fcb20c 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -147,7 +147,6 @@ struct ttm_tt;
* holds a pointer to a persistent shmem object.
* @ttm: TTM structure holding system pages.
* @evicted: Whether the object was evicted without user-space knowing.
- * @cpu_writes: For synchronization. Number of cpu writers.
* @lru: List head for the lru list.
* @ddestroy: List head for the delayed destroy list.
* @swap: List head for swap LRU list.
@@ -198,12 +197,6 @@ struct ttm_buffer_object {
struct ttm_tt *ttm;
bool evicted;
- /**
- * Members protected by the bo::reserved lock only when written to.
- */
-
- atomic_t cpu_writers;
-
/**
* Members protected by the bdev::lru_lock.
*/
@@ -441,31 +434,6 @@ void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched);
bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
const struct ttm_place *place);
-/**
- * ttm_bo_synccpu_write_grab
- *
- * @bo: The buffer object:
- * @no_wait: Return immediately if buffer is busy.
- *
- * Synchronizes a buffer object for CPU RW access. This means
- * command submission that affects the buffer will return -EBUSY
- * until ttm_bo_synccpu_write_release is called.
- *
- * Returns
- * -EBUSY if the buffer is busy and no_wait is true.
- * -ERESTARTSYS if interrupted by a signal.
- */
-int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait);
-
-/**
- * ttm_bo_synccpu_write_release:
- *
- * @bo : The buffer object.
- *
- * Releases a synccpu lock.
- */
-void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo);
-
/**
* ttm_bo_acc_size
*
--
2.20.1
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