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drm/i915/fbdev: Limit the global async-domain synchronization 

During cleanup we have to synchronise with the async task we are using
to initialise and register our fbdev. Currently, we are using a full
synchronisation on the global domain, but we can restrict this to just
synchronising up to our task if we remember our cookie.

Whilst there, streamline the function parameters.

v2: async_synchronize_cookie() takes an exclusive upper bound, to
synchronize with our task we have to pass in the next cookie.
v3: Drop premature disregarding of the active cookie (we need to wait
until the task is complete before continuing in the teardown).
v4: Refactor waiting on async to incorporate a comment explaining why we
need the +1.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1466497015-8509-2-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-06-21 09:16:54 +01:00
parent d626f34573
commit 43cee31434
2 changed files with 27 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/intel_drv.h
View File

@ -159,6 +159,7 @@ struct intel_framebuffer {
struct intel_fbdev {
struct drm_fb_helper helper;
struct intel_framebuffer *fb;
async_cookie_t cookie;
int preferred_bpp;
};

39
drivers/gpu/drm/i915/intel_fbdev.c
View File

@ -538,8 +538,7 @@ static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
.fb_probe = intelfb_create,
};
static void intel_fbdev_destroy(struct drm_device *dev,
struct intel_fbdev *ifbdev)
static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
{
/* We rely on the object-free to release the VMA pinning for
* the info->screen_base mmaping. Leaking the VMA is simpler than
@ -552,12 +551,14 @@ static void intel_fbdev_destroy(struct drm_device *dev,
drm_fb_helper_fini(&ifbdev->helper);
if (ifbdev->fb) {
mutex_lock(&dev->struct_mutex);
mutex_lock(&ifbdev->helper.dev->struct_mutex);
intel_unpin_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&ifbdev->helper.dev->struct_mutex);
drm_framebuffer_remove(&ifbdev->fb->base);
}
kfree(ifbdev);
}
/*
@ -732,32 +733,44 @@ int intel_fbdev_init(struct drm_device *dev)
static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
{
struct drm_i915_private *dev_priv = data;
struct intel_fbdev *ifbdev = dev_priv->fbdev;
struct intel_fbdev *ifbdev = data;
/* Due to peculiar init order wrt to hpd handling this is separate. */
if (drm_fb_helper_initial_config(&ifbdev->helper,
ifbdev->preferred_bpp))
intel_fbdev_fini(dev_priv->dev);
intel_fbdev_fini(ifbdev->helper.dev);
}
void intel_fbdev_initial_config_async(struct drm_device *dev)
{
async_schedule(intel_fbdev_initial_config, to_i915(dev));
struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
}
static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
{
if (!ifbdev->cookie)
return;
/* Only serialises with all preceding async calls, hence +1 */
async_synchronize_cookie(ifbdev->cookie + 1);
ifbdev->cookie = 0;
}
void intel_fbdev_fini(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (!dev_priv->fbdev)
struct intel_fbdev *ifbdev = dev_priv->fbdev;
if (!ifbdev)
return;
flush_work(&dev_priv->fbdev_suspend_work);
if (!current_is_async())
async_synchronize_full();
intel_fbdev_destroy(dev, dev_priv->fbdev);
kfree(dev_priv->fbdev);
intel_fbdev_sync(ifbdev);
intel_fbdev_destroy(ifbdev);
dev_priv->fbdev = NULL;
}