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drm/i915: Reject changes of fb base when we have a flip pending 

This should be impossible due to the wait for outstanding flips that the
caller is meant to perform prior to updating the scanout base. Paranoia
tells me to check anyway.

References: https://bugs.freedesktop.org/show_bug.cgi?id=75502
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2014-03-04 13:15:08 +00:00 committed by Daniel Vetter
parent 227213438a
commit 7d5e379989
1 changed files with 24 additions and 19 deletions
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43
drivers/gpu/drm/i915/intel_display.c
View File

@ -2321,6 +2321,25 @@ intel_finish_fb(struct drm_framebuffer *old_fb)
return ret;
}
static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
unsigned long flags;
bool pending;
if (i915_reset_in_progress(&dev_priv->gpu_error) ||
intel_crtc->reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter))
return false;
spin_lock_irqsave(&dev->event_lock, flags);
pending = to_intel_crtc(crtc)->unpin_work != NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
return pending;
}
static int
intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
struct drm_framebuffer *fb)
@ -2331,6 +2350,11 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
struct drm_framebuffer *old_fb;
int ret;
if (intel_crtc_has_pending_flip(crtc)) {
DRM_ERROR("pipe is still busy with an old pageflip\n");
return -EBUSY;
}
/* no fb bound */
if (!fb) {
DRM_ERROR("No FB bound\n");
@ -2956,25 +2980,6 @@ static void ironlake_fdi_disable(struct drm_crtc *crtc)
udelay(100);
}
static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
unsigned long flags;
bool pending;
if (i915_reset_in_progress(&dev_priv->gpu_error) ||
intel_crtc->reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter))
return false;
spin_lock_irqsave(&dev->event_lock, flags);
pending = to_intel_crtc(crtc)->unpin_work != NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
return pending;
}
bool intel_has_pending_fb_unpin(struct drm_device *dev)
{
struct intel_crtc *crtc;