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drm/i915: Introduce i915_gem_set_seqno() 

This function can be used to set the driver's next_seqno
to arbitrary value.

i915_gem_set_seqno() will idle the gpu, retire outstanding
requests, clear the semaphore mailboxes and set the hardware
status page's seqno index.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala 2012-12-19 11:13:08 +02:00 committed by Daniel Vetter
parent ba1a7067c0
commit fca26bb453
2 changed files with 31 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1479,8 +1479,8 @@ i915_seqno_passed(uint32_t seq1, uint32_t seq2)
return (int32_t)(seq1 - seq2) >= 0;
}
extern int i915_gem_get_seqno(struct drm_device *dev, u32 *seqno);
int __must_check i915_gem_get_seqno(struct drm_device *dev, u32 *seqno);
int __must_check i915_gem_set_seqno(struct drm_device *dev, u32 seqno);
int __must_check i915_gem_object_get_fence(struct drm_i915_gem_object *obj);
int __must_check i915_gem_object_put_fence(struct drm_i915_gem_object *obj);

32
drivers/gpu/drm/i915/i915_gem.c
View File

@ -1926,7 +1926,7 @@ i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
}
static int
i915_gem_handle_seqno_wrap(struct drm_device *dev)
i915_gem_init_seqno(struct drm_device *dev, u32 seqno)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_ring_buffer *ring;
@ -1942,7 +1942,7 @@ i915_gem_handle_seqno_wrap(struct drm_device *dev)
/* Finally reset hw state */
for_each_ring(ring, dev_priv, i) {
intel_ring_init_seqno(ring, 0);
intel_ring_init_seqno(ring, seqno);
for (j = 0; j < ARRAY_SIZE(ring->sync_seqno); j++)
ring->sync_seqno[j] = 0;
@ -1951,6 +1951,32 @@ i915_gem_handle_seqno_wrap(struct drm_device *dev)
return 0;
}
int i915_gem_set_seqno(struct drm_device *dev, u32 seqno)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
if (seqno == 0)
return -EINVAL;
/* HWS page needs to be set less than what we
* will inject to ring
*/
ret = i915_gem_init_seqno(dev, seqno - 1);
if (ret)
return ret;
/* Carefully set the last_seqno value so that wrap
* detection still works
*/
dev_priv->next_seqno = seqno;
dev_priv->last_seqno = seqno - 1;
if (dev_priv->last_seqno == 0)
dev_priv->last_seqno--;
return 0;
}
int
i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)
{
@ -1958,7 +1984,7 @@ i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)
/* reserve 0 for non-seqno */
if (dev_priv->next_seqno == 0) {
int ret = i915_gem_handle_seqno_wrap(dev);
int ret = i915_gem_init_seqno(dev, 0);
if (ret)
return ret;