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drm/i915: add i915_lp_ring_sync helper

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This just waits until the hw passed the current ring position with
cmd execution. This slightly changes the existing i915_wait_request
function to make uninterruptible waiting possible - no point in
returning to userspace while mucking around with the overlay, that
piece of hw is just too fragile.

Also replace a magic 0 with the symbolic constant (and kill the then
superflous comment) while I was looking at the code.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Daniel Vetter 2009-09-15 22:57:32 +02:00 committed by Eric Anholt
parent 7a9c906094
commit 48764bf43f
3 changed files with 41 additions and 11 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
View file

@ -803,6 +803,7 @@ void i915_gem_cleanup_ringbuffer(struct drm_device *dev);
int i915_gem_do_init(struct drm_device *dev, unsigned long start,
unsigned long end);
int i915_gem_idle(struct drm_device *dev);
int i915_lp_ring_sync(struct drm_device *dev);
int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
int i915_gem_object_set_to_gtt_domain(struct drm_gem_object *obj,
int write);

49
drivers/gpu/drm/i915/i915_gem.c
View file

@ -1820,12 +1820,8 @@ i915_gem_retire_work_handler(struct work_struct *work)
mutex_unlock(&dev->struct_mutex);
}
/**
* Waits for a sequence number to be signaled, and cleans up the
* request and object lists appropriately for that event.
*/
static int
i915_wait_request(struct drm_device *dev, uint32_t seqno)
i915_do_wait_request(struct drm_device *dev, uint32_t seqno, int interruptible)
{
drm_i915_private_t *dev_priv = dev->dev_private;
u32 ier;
@ -1852,10 +1848,15 @@ i915_wait_request(struct drm_device *dev, uint32_t seqno)
dev_priv->mm.waiting_gem_seqno = seqno;
i915_user_irq_get(dev);
ret = wait_event_interruptible(dev_priv->irq_queue,
i915_seqno_passed(i915_get_gem_seqno(dev),
seqno) ||
atomic_read(&dev_priv->mm.wedged));
if (interruptible)
ret = wait_event_interruptible(dev_priv->irq_queue,
i915_seqno_passed(i915_get_gem_seqno(dev), seqno) ||
atomic_read(&dev_priv->mm.wedged));
else
wait_event(dev_priv->irq_queue,
i915_seqno_passed(i915_get_gem_seqno(dev), seqno) ||
atomic_read(&dev_priv->mm.wedged));
i915_user_irq_put(dev);
dev_priv->mm.waiting_gem_seqno = 0;
@ -1879,6 +1880,34 @@ i915_wait_request(struct drm_device *dev, uint32_t seqno)
return ret;
}
/**
* Waits for a sequence number to be signaled, and cleans up the
* request and object lists appropriately for that event.
*/
static int
i915_wait_request(struct drm_device *dev, uint32_t seqno)
{
return i915_do_wait_request(dev, seqno, 1);
}
/**
* Waits for the ring to finish up to the latest request. Usefull for waiting
* for flip events, e.g for the overlay support. */
int i915_lp_ring_sync(struct drm_device *dev)
{
uint32_t seqno;
int ret;
seqno = i915_add_request(dev, NULL, 0);
if (seqno == 0)
return -ENOMEM;
ret = i915_do_wait_request(dev, seqno, 0);
BUG_ON(ret == -ERESTARTSYS);
return ret;
}
static void
i915_gem_flush(struct drm_device *dev,
uint32_t invalidate_domains,
@ -1947,7 +1976,7 @@ i915_gem_flush(struct drm_device *dev,
#endif
BEGIN_LP_RING(2);
OUT_RING(cmd);
OUT_RING(0); /* noop */
OUT_RING(MI_NOOP);
ADVANCE_LP_RING();
}
}

2
include/drm/drm_os_linux.h
View file

@ -123,5 +123,5 @@ do { \
remove_wait_queue(&(queue), &entry); \
} while (0)
#define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
#define DRM_WAKEUP( queue ) wake_up( queue )
#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )