mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-12 09:56:45 +07:00
drm/i915: Do interrupible mutex lock first to avoid locking for unreference
One of the primarily consumers of the i915 driver is X, a large signal driven application. Frequently when writing into the buffers, there is a pending signal which causes us not to take the interruptible lock but then we need to take that same lock around the object unreference. By rearranging the code to do the interruptible lock as the first check, we can avoid the frequent additional locking around the unreference. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
parent
139d363bcf
commit
1d7cfea152
@ -547,16 +547,16 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
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struct drm_i915_gem_object *obj_priv;
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int ret = 0;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL)
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return -ENOENT;
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obj_priv = to_intel_bo(obj);
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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if (ret)
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return ret;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL) {
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ret = -ENOENT;
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goto unlock;
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}
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obj_priv = to_intel_bo(obj);
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/* Bounds check source. */
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if (args->offset > obj->size || args->size > obj->size - args->offset) {
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@ -601,6 +601,7 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
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i915_gem_object_put_pages(obj);
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out:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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@ -982,16 +983,17 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
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struct drm_i915_gem_object *obj_priv;
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int ret = 0;
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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return ret;
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obj = drm_gem_object_lookup(dev, file, args->handle);
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if (obj == NULL)
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return -ENOENT;
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if (obj == NULL) {
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ret = -ENOENT;
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goto unlock;
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}
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obj_priv = to_intel_bo(obj);
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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return ret;
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}
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/* Bounds check destination. */
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if (args->offset > obj->size || args->size > obj->size - args->offset) {
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@ -1062,6 +1064,7 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
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out:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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@ -1098,16 +1101,16 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
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if (write_domain != 0 && read_domains != write_domain)
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return -EINVAL;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL)
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return -ENOENT;
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obj_priv = to_intel_bo(obj);
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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if (ret)
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return ret;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL) {
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ret = -ENOENT;
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goto unlock;
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}
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obj_priv = to_intel_bo(obj);
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intel_mark_busy(dev, obj);
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@ -1139,6 +1142,7 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
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list_move_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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@ -1157,14 +1161,14 @@ i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
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if (!(dev->driver->driver_features & DRIVER_GEM))
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return -ENODEV;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL)
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return -ENOENT;
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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if (ret)
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return ret;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL) {
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ret = -ENOENT;
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goto unlock;
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}
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/* Pinned buffers may be scanout, so flush the cache */
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@ -1172,6 +1176,7 @@ i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
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i915_gem_object_flush_cpu_write_domain(obj);
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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@ -1469,33 +1474,27 @@ i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
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if (!(dev->driver->driver_features & DRIVER_GEM))
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return -ENODEV;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL)
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return -ENOENT;
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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if (ret)
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return ret;
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}
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL) {
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ret = -ENOENT;
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goto unlock;
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}
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obj_priv = to_intel_bo(obj);
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if (obj_priv->madv != I915_MADV_WILLNEED) {
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DRM_ERROR("Attempting to mmap a purgeable buffer\n");
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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ret = -EINVAL;
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goto out;
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}
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if (!obj_priv->mmap_offset) {
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ret = i915_gem_create_mmap_offset(obj);
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if (ret) {
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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if (ret)
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goto out;
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}
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args->offset = obj_priv->mmap_offset;
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@ -1506,17 +1505,15 @@ i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
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*/
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if (!obj_priv->agp_mem) {
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ret = i915_gem_object_bind_to_gtt(obj, 0);
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if (ret) {
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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if (ret)
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goto out;
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}
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out:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return 0;
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return ret;
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}
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static void
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@ -4100,44 +4097,36 @@ i915_gem_pin_ioctl(struct drm_device *dev, void *data,
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struct drm_i915_gem_object *obj_priv;
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int ret;
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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return ret;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL) {
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DRM_ERROR("Bad handle in i915_gem_pin_ioctl(): %d\n",
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args->handle);
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return -ENOENT;
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ret = -ENOENT;
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goto unlock;
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}
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obj_priv = to_intel_bo(obj);
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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return ret;
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}
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if (obj_priv->madv != I915_MADV_WILLNEED) {
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DRM_ERROR("Attempting to pin a purgeable buffer\n");
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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ret = -EINVAL;
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goto out;
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}
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if (obj_priv->pin_filp != NULL && obj_priv->pin_filp != file_priv) {
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DRM_ERROR("Already pinned in i915_gem_pin_ioctl(): %d\n",
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args->handle);
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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ret = -EINVAL;
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goto out;
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}
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obj_priv->user_pin_count++;
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obj_priv->pin_filp = file_priv;
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if (obj_priv->user_pin_count == 1) {
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ret = i915_gem_object_pin(obj, args->alignment);
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if (ret != 0) {
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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if (ret)
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goto out;
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}
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/* XXX - flush the CPU caches for pinned objects
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@ -4145,10 +4134,11 @@ i915_gem_pin_ioctl(struct drm_device *dev, void *data,
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*/
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i915_gem_object_flush_cpu_write_domain(obj);
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args->offset = obj_priv->gtt_offset;
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out:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return 0;
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return ret;
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}
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int
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@ -4160,27 +4150,22 @@ i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
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struct drm_i915_gem_object *obj_priv;
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int ret;
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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return ret;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL) {
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DRM_ERROR("Bad handle in i915_gem_unpin_ioctl(): %d\n",
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args->handle);
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return -ENOENT;
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ret = -ENOENT;
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goto unlock;
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}
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obj_priv = to_intel_bo(obj);
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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return ret;
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}
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if (obj_priv->pin_filp != file_priv) {
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DRM_ERROR("Not pinned by caller in i915_gem_pin_ioctl(): %d\n",
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args->handle);
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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ret = -EINVAL;
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goto out;
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}
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obj_priv->user_pin_count--;
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if (obj_priv->user_pin_count == 0) {
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@ -4188,9 +4173,11 @@ i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
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i915_gem_object_unpin(obj);
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}
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out:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return 0;
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return ret;
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}
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int
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@ -4202,25 +4189,22 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
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struct drm_i915_gem_object *obj_priv;
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int ret;
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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return ret;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL) {
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DRM_ERROR("Bad handle in i915_gem_busy_ioctl(): %d\n",
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args->handle);
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return -ENOENT;
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}
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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return ret;
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ret = -ENOENT;
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goto unlock;
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}
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obj_priv = to_intel_bo(obj);
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/* Count all active objects as busy, even if they are currently not used
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* by the gpu. Users of this interface expect objects to eventually
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* become non-busy without any further actions, therefore emit any
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* necessary flushes here.
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*/
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obj_priv = to_intel_bo(obj);
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args->busy = obj_priv->active;
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if (args->busy) {
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/* Unconditionally flush objects, even when the gpu still uses this
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@ -4244,8 +4228,9 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
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}
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return 0;
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return ret;
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}
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int
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@ -4272,26 +4257,20 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
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return -EINVAL;
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}
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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return ret;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (obj == NULL) {
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DRM_ERROR("Bad handle in i915_gem_madvise_ioctl(): %d\n",
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args->handle);
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return -ENOENT;
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ret = -ENOENT;
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goto unlock;
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}
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obj_priv = to_intel_bo(obj);
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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return ret;
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}
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if (obj_priv->pin_count) {
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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DRM_ERROR("Attempted i915_gem_madvise_ioctl() on a pinned object\n");
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return -EINVAL;
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ret = -EINVAL;
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goto out;
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}
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if (obj_priv->madv != __I915_MADV_PURGED)
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@ -4304,10 +4283,11 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
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args->retained = obj_priv->madv != __I915_MADV_PURGED;
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out:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return 0;
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return ret;
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}
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struct drm_gem_object * i915_gem_alloc_object(struct drm_device *dev,
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