[PATCH] drm/ttm: move cpu_writers handling into vmwgfx
Christian König
ckoenig.leichtzumerken at gmail.com
Fri Jun 7 14:47:58 UTC 2019
This feature is only used by vmwgfx and superflous for everybody else.
Signed-off-by: Christian König <christian.koenig at amd.com>
---
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 | 35 ++++++++++++++++++++----
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 2 ++
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 8 ++++++
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 4 +++
include/drm/ttm/ttm_bo_api.h | 31 ---------------------
8 files changed, 45 insertions(+), 70 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index c7de667d482a..4ec055ffd6a7 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));
@@ -1308,7 +1307,6 @@ 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);
@@ -1814,31 +1812,6 @@ 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 895d77d799e4..6f43f1f0de7c 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.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 957ec375a4ba..80fa52b36d5c 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)) {
- reservation_object_unlock(bo->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 5d5c2bce01f3..457861c5047f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -565,7 +565,7 @@ 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");
@@ -681,12 +681,12 @@ 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 = reservation_object_wait_timeout_rcu
@@ -699,15 +699,20 @@ 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;
}
@@ -731,6 +736,26 @@ static int vmw_user_bo_synccpu_release(uint32_t handle,
return 0;
}
+/**
+ * vmw_user_bo_verify_synccpu - Verify if grab for CPU access exists
+ *
+ * @list: list of ttm_validate_buffer objects
+ *
+ * Return:
+ * -EBUSY if a CPU grab is found, 0 otherwise.
+ */
+int vmw_user_bo_verify_synccpu(struct list_head *list)
+{
+ struct ttm_validate_buffer *entry;
+
+ list_for_each_entry(entry, list, head) {
+ struct vmw_buffer_object *bo = vmw_buffer_object(entry->bo);
+
+ if (unlikely(atomic_read(&bo->cpu_writers) > 0))
+ return -EBUSY;
+ }
+ return 0;
+}
/**
* vmw_user_bo_synccpu_ioctl - ioctl function implementing the synccpu
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 96983c47fb40..b3988c957f0e 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -90,6 +90,7 @@ 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 */
@@ -749,6 +750,7 @@ extern int vmw_bo_init(struct vmw_private *dev_priv,
void (*bo_free)(struct ttm_buffer_object *bo));
extern int vmw_user_bo_verify_access(struct ttm_buffer_object *bo,
struct ttm_object_file *tfile);
+extern int vmw_user_bo_verify_synccpu(struct list_head *list);
extern int vmw_user_bo_alloc(struct vmw_private *dev_priv,
struct ttm_object_file *tfile,
uint32_t size,
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 2ff7ba04d8c8..271217f6e3a3 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -3719,6 +3719,10 @@ int vmw_execbuf_process(struct drm_file *file_priv,
if (unlikely(ret != 0))
goto out_err_nores;
+ ret = vmw_user_bo_verify_synccpu(&val_ctx.bo_list);
+ if (unlikely(ret != 0))
+ goto out_err;
+
ret = vmw_validation_bo_validate(&val_ctx, true);
if (unlikely(ret != 0))
goto out_err;
@@ -3918,6 +3922,10 @@ void __vmw_execbuf_release_pinned_bo(struct vmw_private *dev_priv,
if (ret)
goto out_no_reserve;
+ ret = vmw_user_bo_verify_synccpu(&val_ctx.bo_list);
+ if (unlikely(ret != 0))
+ goto out_no_emit;
+
if (dev_priv->query_cid_valid) {
BUG_ON(fence != NULL);
ret = vmw_fifo_emit_dummy_query(dev_priv, dev_priv->query_cid);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 1d38a8b2f2ec..c55da6f0ff03 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -469,6 +469,10 @@ vmw_resource_check_buffer(struct ww_acquire_ctx *ticket,
if (unlikely(ret != 0))
goto out_no_reserve;
+ ret = vmw_user_bo_verify_synccpu(&val_list);
+ if (unlikely(ret != 0))
+ goto out_no_validate;
+
if (res->func->needs_backup && list_empty(&res->mob_head))
return 0;
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 49d9cdfc58f2..e358e965d4c0 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -145,7 +145,6 @@ 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.
@@ -195,11 +194,6 @@ 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.
@@ -443,31 +437,6 @@ 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
*
--
2.17.1
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