diff options
author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-12-11 16:51:35 +0100 |
---|---|---|
committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-01-20 22:17:12 +0100 |
commit | b62584e366ebcb3adffefad373a5abc4c4b677ca (patch) | |
tree | 12d9031be150949f3d4adcbe5aa7cd121df4e4c1 /drivers/gpu/drm/drm_crtc.c | |
parent | 2fd5eabab02d9cdade04397eae0bfd49f452cdba (diff) |
drm: optimize drm_framebuffer_remove
Now that all framebuffer usage is properly refcounted, we are no
longer required to hold the modeset locks while dropping the last
reference. Hence implemented a fastpath which avoids the potential
stalls associated with grabbing mode_config.lock for the case where
there's no other reference around.
Explain in a big comment why it is safe. Also update kerneldocs with
the new locking rules around drm_framebuffer_remove.
Reviewed-by: Rob Clark <rob@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_crtc.c')
-rw-r--r-- | drivers/gpu/drm/drm_crtc.c | 72 |
1 files changed, 45 insertions, 27 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 6dc75ee10079..9492e7ec9d9d 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -517,7 +517,11 @@ EXPORT_SYMBOL(drm_framebuffer_cleanup); * * Scans all the CRTCs and planes in @dev's mode_config. If they're * using @fb, removes it, setting it to NULL. Then drops the reference to the - * passed-in framebuffer. + * passed-in framebuffer. Might take the modeset locks. + * + * Note that this function optimizes the cleanup away if the caller holds the + * last reference to the framebuffer. It is also guaranteed to not take the + * modeset locks in this case. */ void drm_framebuffer_remove(struct drm_framebuffer *fb) { @@ -527,33 +531,51 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb) struct drm_mode_set set; int ret; - WARN_ON(!drm_modeset_is_locked(dev)); WARN_ON(!list_empty(&fb->filp_head)); - /* remove from any CRTC */ - list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { - if (crtc->fb == fb) { - /* should turn off the crtc */ - memset(&set, 0, sizeof(struct drm_mode_set)); - set.crtc = crtc; - set.fb = NULL; - ret = drm_mode_set_config_internal(&set); - if (ret) - DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc); + /* + * drm ABI mandates that we remove any deleted framebuffers from active + * useage. But since most sane clients only remove framebuffers they no + * longer need, try to optimize this away. + * + * Since we're holding a reference ourselves, observing a refcount of 1 + * means that we're the last holder and can skip it. Also, the refcount + * can never increase from 1 again, so we don't need any barriers or + * locks. + * + * Note that userspace could try to race with use and instate a new + * usage _after_ we've cleared all current ones. End result will be an + * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot + * in this manner. + */ + if (atomic_read(&fb->refcount.refcount) > 1) { + drm_modeset_lock_all(dev); + /* remove from any CRTC */ + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { + if (crtc->fb == fb) { + /* should turn off the crtc */ + memset(&set, 0, sizeof(struct drm_mode_set)); + set.crtc = crtc; + set.fb = NULL; + ret = drm_mode_set_config_internal(&set); + if (ret) + DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc); + } } - } - list_for_each_entry(plane, &dev->mode_config.plane_list, head) { - if (plane->fb == fb) { - /* should turn off the crtc */ - ret = plane->funcs->disable_plane(plane); - if (ret) - DRM_ERROR("failed to disable plane with busy fb\n"); - /* disconnect the plane from the fb and crtc: */ - __drm_framebuffer_unreference(plane->fb); - plane->fb = NULL; - plane->crtc = NULL; + list_for_each_entry(plane, &dev->mode_config.plane_list, head) { + if (plane->fb == fb) { + /* should turn off the crtc */ + ret = plane->funcs->disable_plane(plane); + if (ret) + DRM_ERROR("failed to disable plane with busy fb\n"); + /* disconnect the plane from the fb and crtc: */ + __drm_framebuffer_unreference(plane->fb); + plane->fb = NULL; + plane->crtc = NULL; + } } + drm_modeset_unlock_all(dev); } drm_framebuffer_unreference(fb); @@ -2538,9 +2560,7 @@ int drm_mode_rmfb(struct drm_device *dev, mutex_unlock(&dev->mode_config.fb_lock); mutex_unlock(&file_priv->fbs_lock); - drm_modeset_lock_all(dev); drm_framebuffer_remove(fb); - drm_modeset_unlock_all(dev); return 0; @@ -2691,9 +2711,7 @@ void drm_fb_release(struct drm_file *priv) list_del_init(&fb->filp_head); /* This will also drop the fpriv->fbs reference. */ - drm_modeset_lock_all(dev); drm_framebuffer_remove(fb); - drm_modeset_unlock_all(dev); } mutex_unlock(&priv->fbs_lock); } |