From: Brad Volkin <bradley.d.volkin@xxxxxxxxx>
The command parser is going to need the same synchronization and
setup logic, so factor it out for reuse.
Signed-off-by: Brad Volkin <bradley.d.volkin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 3 +++
drivers/gpu/drm/i915/i915_gem.c | 48 +++++++++++++++++++++++++++++------------
2 files changed, 37 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 3673ba1..bfb30df 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2045,6 +2045,9 @@ void i915_gem_release_all_mmaps(struct drm_i915_private *dev_priv);
void i915_gem_release_mmap(struct drm_i915_gem_object *obj);
void i915_gem_lastclose(struct drm_device *dev);
+int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
+ int *needs_clflush);
+
int __must_check i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
static inline struct page *i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
{
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 39770f7..fdc1f40 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -332,6 +332,39 @@ __copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset,
return 0;
}
+/*
+ * Pins the specified object's pages and synchronizes the object with
+ * GPU accesses. Sets needs_clflush to non-zero if the caller should
+ * flush the object from the CPU cache.
+ */
+int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
+ int *needs_clflush)
+{
+ int ret;
+
+ *needs_clflush = 0;
+
+ if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) {
+ /* If we're not in the cpu read domain, set ourself into the gtt
+ * read domain and manually flush cachelines (if required). This
+ * optimizes for the case when the gpu will dirty the data
+ * anyway again before the next pread happens. */
+ *needs_clflush = !cpu_cache_is_coherent(obj->base.dev,
+ obj->cache_level);
+ ret = i915_gem_object_wait_rendering(obj, true);
+ if (ret)
+ return ret;
+ }
+
+ ret = i915_gem_object_get_pages(obj);
+ if (ret)
+ return ret;
+
+ i915_gem_object_pin_pages(obj);
+
+ return ret;
+}
+
/* Per-page copy function for the shmem pread fastpath.
* Flushes invalid cachelines before reading the target if
* needs_clflush is set. */
@@ -429,23 +462,10 @@ i915_gem_shmem_pread(struct drm_device *dev,
obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
- if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) {
- /* If we're not in the cpu read domain, set ourself into the gtt
- * read domain and manually flush cachelines (if required). This
- * optimizes for the case when the gpu will dirty the data
- * anyway again before the next pread happens. */
- needs_clflush = !cpu_cache_is_coherent(dev, obj->cache_level);
- ret = i915_gem_object_wait_rendering(obj, true);
- if (ret)
- return ret;
- }
-
- ret = i915_gem_object_get_pages(obj);
+ ret = i915_gem_obj_prepare_shmem_read(obj, &needs_clflush);
if (ret)
return ret;
- i915_gem_object_pin_pages(obj);
-
offset = args->offset;
for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents,
--
1.8.5.2
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