On 14/01/2015 11:20, Chris Wilson wrote:
Move the madvise logic out of the execbuffer main path into the
relatively rare allocation path, making the execbuffer manipulation less
fragile.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_cmd_parser.c | 12 +++---------
drivers/gpu/drm/i915/i915_gem_batch_pool.c | 31 +++++++++++++++---------------
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 11 +++--------
3 files changed, 21 insertions(+), 33 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index 9a6da3536ae5..3e5e8cb54a88 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -866,6 +866,9 @@ static u32 *copy_batch(struct drm_i915_gem_object *dest_obj,
batch_len + batch_start_offset > src_obj->base.size)
return ERR_PTR(-E2BIG);
+ if (WARN_ON(dest_obj->pages_pin_count == 0))
+ return ERR_PTR(-ENODEV);
+
ret = i915_gem_obj_prepare_shmem_read(src_obj, &needs_clflush);
if (ret) {
DRM_DEBUG_DRIVER("CMD: failed to prepare shadow batch\n");
@@ -879,13 +882,6 @@ static u32 *copy_batch(struct drm_i915_gem_object *dest_obj,
goto unpin_src;
}
- ret = i915_gem_object_get_pages(dest_obj);
- if (ret) {
- DRM_DEBUG_DRIVER("CMD: Failed to get pages for shadow batch\n");
- goto unmap_src;
- }
- i915_gem_object_pin_pages(dest_obj);
-
ret = i915_gem_object_set_to_cpu_domain(dest_obj, true);
if (ret) {
DRM_DEBUG_DRIVER("CMD: Failed to set shadow batch to CPU\n");
@@ -895,7 +891,6 @@ static u32 *copy_batch(struct drm_i915_gem_object *dest_obj,
dst = vmap_batch(dest_obj, 0, batch_len);
if (!dst) {
DRM_DEBUG_DRIVER("CMD: Failed to vmap shadow batch\n");
- i915_gem_object_unpin_pages(dest_obj);
ret = -ENOMEM;
goto unmap_src;
}
@@ -1126,7 +1121,6 @@ int i915_parse_cmds(struct intel_engine_cs *ring,
}
vunmap(batch_base);
- i915_gem_object_unpin_pages(shadow_batch_obj);
return ret;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_batch_pool.c b/drivers/gpu/drm/i915/i915_gem_batch_pool.c
index c690170a1c4f..e5c88ddd8452 100644
--- a/drivers/gpu/drm/i915/i915_gem_batch_pool.c
+++ b/drivers/gpu/drm/i915/i915_gem_batch_pool.c
@@ -66,9 +66,7 @@ void i915_gem_batch_pool_fini(struct i915_gem_batch_pool *pool)
struct drm_i915_gem_object,
batch_pool_list);
- WARN_ON(obj->active);
-
- list_del_init(&obj->batch_pool_list);
+ list_del(&obj->batch_pool_list);
drm_gem_object_unreference(&obj->base);
}
}
@@ -96,10 +94,9 @@ i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool,
WARN_ON(!mutex_is_locked(&pool->dev->struct_mutex));
list_for_each_entry_safe(tmp, next,
- &pool->cache_list, batch_pool_list) {
-
+ &pool->cache_list, batch_pool_list) {
if (tmp->active)
- continue;
+ break;
/* While we're looping, do some clean up */
if (tmp->madv == __I915_MADV_PURGED) {
@@ -113,25 +110,27 @@ i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool,
* but not 'too much' bigger. A better way to do this
* might be to bucket the pool objects based on size.
*/
- if (tmp->base.size >= size &&
- tmp->base.size <= (2 * size)) {
+ if (tmp->base.size >= size && tmp->base.size <= 2 * size) {
obj = tmp;
break;
}
}
- if (!obj) {
+ if (obj == NULL) {
+ int ret;
+
obj = i915_gem_alloc_object(pool->dev, size);
- if (!obj)
+ if (obj == NULL)
return ERR_PTR(-ENOMEM);
- list_add_tail(&obj->batch_pool_list, &pool->cache_list);
- }
- else
- /* Keep list in LRU order */
- list_move_tail(&obj->batch_pool_list, &pool->cache_list);
+ ret = i915_gem_object_get_pages(obj);
+ if (ret)
+ return ERR_PTR(ret);
- obj->madv = I915_MADV_WILLNEED;
+ obj->madv = I915_MADV_DONTNEED;
+ }
+ list_move_tail(&obj->batch_pool_list, &pool->cache_list);
Why is it now safe to do a move_tail instead of add_tail if the node has
just been allocated? Was the original add_tail() wrong or am I not
spotting some critical difference to how new pool objects are created?
+ i915_gem_object_pin_pages(obj);
Is it worth updating the function description comment to add a line
about the returned buffer now being pinned and the caller must worry
about unpinning it?
return obj;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 3fbd5212225f..6357f01e6c46 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -37,7 +37,6 @@
#define __EXEC_OBJECT_HAS_FENCE (1<<30)
#define __EXEC_OBJECT_NEEDS_MAP (1<<29)
#define __EXEC_OBJECT_NEEDS_BIAS (1<<28)
-#define __EXEC_OBJECT_PURGEABLE (1<<27)
#define BATCH_OFFSET_BIAS (256*1024)
@@ -224,12 +223,7 @@ i915_gem_execbuffer_unreserve_vma(struct i915_vma *vma)
if (entry->flags & __EXEC_OBJECT_HAS_PIN)
vma->pin_count--;
- if (entry->flags & __EXEC_OBJECT_PURGEABLE)
- obj->madv = I915_MADV_DONTNEED;
-
- entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE |
- __EXEC_OBJECT_HAS_PIN |
- __EXEC_OBJECT_PURGEABLE);
+ entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
}
static void eb_destroy(struct eb_vmas *eb)
@@ -1154,6 +1148,7 @@ i915_gem_execbuffer_parse(struct intel_engine_cs *ring,
batch_start_offset,
batch_len,
is_master);
+ i915_gem_object_unpin_pages(shadow_batch_obj);
if (ret)
goto err;
@@ -1165,7 +1160,7 @@ i915_gem_execbuffer_parse(struct intel_engine_cs *ring,
vma = i915_gem_obj_to_ggtt(shadow_batch_obj);
vma->exec_entry = shadow_exec_entry;
- vma->exec_entry->flags = __EXEC_OBJECT_PURGEABLE | __EXEC_OBJECT_HAS_PIN;
+ vma->exec_entry->flags = __EXEC_OBJECT_HAS_PIN;
drm_gem_object_reference(&shadow_batch_obj->base);
list_add_tail(&vma->exec_list, &eb->vmas);
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