From: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx>
This patch provides support for the User to populate the object
with system pages at its creation time. Since this can be safely
performed without holding the 'struct_mutex', it would help to reduce
the time 'struct_mutex' is kept locked especially during the exec-buffer
path, where it is generally held for the longest time.
Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_dma.c | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 51 +++++++++++++++++++++++++++++++----------
include/uapi/drm/i915_drm.h | 11 ++++-----
3 files changed, 45 insertions(+), 19 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 8319e07..955aa16 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -171,7 +171,7 @@ static int i915_getparam(struct drm_device *dev, void *data,
value = HAS_RESOURCE_STREAMER(dev);
break;
case I915_PARAM_CREATE_VERSION:
- value = 2;
+ value = 3;
break;
default:
DRM_DEBUG("Unknown parameter %d\n", param->param);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c44bd05..3904feb 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -46,6 +46,7 @@ static void
i915_gem_object_retire__write(struct drm_i915_gem_object *obj);
static void
i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int ring);
+static int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
static bool cpu_cache_is_coherent(struct drm_device *dev,
enum i915_cache_level level)
@@ -414,6 +415,18 @@ i915_gem_create(struct drm_file *file,
if (obj == NULL)
return -ENOMEM;
+ if (flags & I915_CREATE_POPULATE) {
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ ret = __i915_gem_object_get_pages(obj);
+ if (ret)
+ return ret;
+
+ mutex_lock(&dev->struct_mutex);
+ list_add_tail(&obj->global_list, &dev_priv->mm.unbound_list);
+ mutex_unlock(&dev->struct_mutex);
+ }
+
ret = drm_gem_handle_create(file, &obj->base, &handle);
/* drop reference from allocate - handle holds it now */
drm_gem_object_unreference_unlocked(&obj->base);
@@ -2328,6 +2341,31 @@ err_pages:
return ret;
}
+static int
+__i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
+{
+ const struct drm_i915_gem_object_ops *ops = obj->ops;
+ int ret;
+
+ WARN_ON(obj->pages);
+
+ if (obj->madv != I915_MADV_WILLNEED) {
+ DRM_DEBUG("Attempting to obtain a purgeable object\n");
+ return -EFAULT;
+ }
+
+ BUG_ON(obj->pages_pin_count);
+
+ ret = ops->get_pages(obj);
+ if (ret)
+ return ret;
+
+ obj->get_page.sg = obj->pages->sgl;
+ obj->get_page.last = 0;
+
+ return 0;
+}
+
/* Ensure that the associated pages are gathered from the backing storage
* and pinned into our object. i915_gem_object_get_pages() may be called
* multiple times before they are released by a single call to
@@ -2339,28 +2377,17 @@ int
i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
- const struct drm_i915_gem_object_ops *ops = obj->ops;
int ret;
if (obj->pages)
return 0;
- if (obj->madv != I915_MADV_WILLNEED) {
- DRM_DEBUG("Attempting to obtain a purgeable object\n");
- return -EFAULT;
- }
-
- BUG_ON(obj->pages_pin_count);
-
- ret = ops->get_pages(obj);
+ ret = __i915_gem_object_get_pages(obj);
if (ret)
return ret;
list_add_tail(&obj->global_list, &dev_priv->mm.unbound_list);
- obj->get_page.sg = obj->pages->sgl;
- obj->get_page.last = 0;
-
return 0;
}
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index f71f75c..26ea715 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -457,20 +457,19 @@ struct drm_i915_gem_create {
__u32 handle;
__u32 pad;
/**
- * Requested flags (currently used for placement
- * (which memory domain))
+ * Requested flags
*
* You can request that the object be created from special memory
* rather than regular system pages using this parameter. Such
* irregular objects may have certain restrictions (such as CPU
* access to a stolen object is verboten).
- *
- * This can be used in the future for other purposes too
- * e.g. specifying tiling/caching/madvise
+ * Also using this parameter object can be pre-populated with system
+ * pages.
*/
__u32 flags;
#define I915_CREATE_PLACEMENT_STOLEN (1<<0) /* Cannot use CPU mmaps */
-#define __I915_CREATE_UNKNOWN_FLAGS -(I915_CREATE_PLACEMENT_STOLEN << 1)
+#define I915_CREATE_POPULATE (1<<1) /* Pre-populate object pages */
+#define __I915_CREATE_UNKNOWN_FLAGS -(I915_CREATE_POPULATE << 1)
};
struct drm_i915_gem_pread {
--
1.9.1
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