drm/i915: Add ioctl to set 'purgeability' of objects
Similar to the madvise() concept, the application may wish to mark some
data as volatile. That is in the event of memory pressure the kernel is
free to discard such buffers safe in the knowledge that the application
can recreate them on demand, and is simply using these as a cache.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 2fff2e0..2ab30f2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1436,13 +1436,21 @@
if (obj_priv->tiling_mode != I915_TILING_NONE)
i915_gem_object_save_bit_17_swizzle(obj);
- for (i = 0; i < page_count; i++)
- if (obj_priv->pages[i] != NULL) {
- if (obj_priv->dirty)
- set_page_dirty(obj_priv->pages[i]);
- mark_page_accessed(obj_priv->pages[i]);
- page_cache_release(obj_priv->pages[i]);
- }
+ if (obj_priv->madv == I915_MADV_DONTNEED)
+ obj_priv->dirty = 0;
+
+ for (i = 0; i < page_count; i++) {
+ if (obj_priv->pages[i] == NULL)
+ break;
+
+ if (obj_priv->dirty)
+ set_page_dirty(obj_priv->pages[i]);
+
+ if (obj_priv->madv == I915_MADV_WILLNEED)
+ mark_page_accessed(obj_priv->pages[i]);
+
+ page_cache_release(obj_priv->pages[i]);
+ }
obj_priv->dirty = 0;
drm_free_large(obj_priv->pages);
@@ -2412,6 +2420,12 @@
if (dev_priv->mm.suspended)
return -EBUSY;
+
+ if (obj_priv->madv == I915_MADV_DONTNEED) {
+ DRM_ERROR("Attempting to bind a purgeable object\n");
+ return -EINVAL;
+ }
+
if (alignment == 0)
alignment = i915_gem_get_gtt_alignment(obj);
if (alignment & (i915_gem_get_gtt_alignment(obj) - 1)) {
@@ -3679,6 +3693,13 @@
}
obj_priv = obj->driver_private;
+ if (obj_priv->madv == I915_MADV_DONTNEED) {
+ DRM_ERROR("Attempting to pin a I915_MADV_DONTNEED buffer\n");
+ drm_gem_object_unreference(obj);
+ mutex_unlock(&dev->struct_mutex);
+ return -EINVAL;
+ }
+
if (obj_priv->pin_filp != NULL && obj_priv->pin_filp != file_priv) {
DRM_ERROR("Already pinned in i915_gem_pin_ioctl(): %d\n",
args->handle);
@@ -3791,6 +3812,49 @@
return i915_gem_ring_throttle(dev, file_priv);
}
+int
+i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_i915_gem_madvise *args = data;
+ struct drm_gem_object *obj;
+ struct drm_i915_gem_object *obj_priv;
+
+ switch (args->madv) {
+ case I915_MADV_DONTNEED:
+ case I915_MADV_WILLNEED:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+ if (obj == NULL) {
+ DRM_ERROR("Bad handle in i915_gem_madvise_ioctl(): %d\n",
+ args->handle);
+ return -EBADF;
+ }
+
+ mutex_lock(&dev->struct_mutex);
+ obj_priv = obj->driver_private;
+
+ if (obj_priv->pin_count) {
+ drm_gem_object_unreference(obj);
+ mutex_unlock(&dev->struct_mutex);
+
+ DRM_ERROR("Attempted i915_gem_madvise_ioctl() on a pinned object\n");
+ return -EINVAL;
+ }
+
+ obj_priv->madv = args->madv;
+ args->retained = obj_priv->gtt_space != NULL;
+
+ drm_gem_object_unreference(obj);
+ mutex_unlock(&dev->struct_mutex);
+
+ return 0;
+}
+
int i915_gem_init_object(struct drm_gem_object *obj)
{
struct drm_i915_gem_object *obj_priv;
@@ -3815,6 +3879,7 @@
obj_priv->fence_reg = I915_FENCE_REG_NONE;
INIT_LIST_HEAD(&obj_priv->list);
INIT_LIST_HEAD(&obj_priv->fence_list);
+ obj_priv->madv = I915_MADV_WILLNEED;
return 0;
}
@@ -4506,7 +4571,7 @@
static inline int
i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj_priv)
{
- return !obj_priv->dirty;
+ return !obj_priv->dirty || obj_priv->madv == I915_MADV_DONTNEED;
}
static int