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drm/i915: add set_tail hook in struct intel_ring_buffer

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This is prepared for video codec ring buffer on Sandybridge. It is
needed to read/write more than one register to move the tail pointer of
the video codec ring on Sandybridge.

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Xiang, Haihao 2010-09-16 10:43:12 +08:00 committed by Chris Wilson
parent 5c1143bbec
commit d46eefa297
2 changed files with 19 additions and 5 deletions
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22
drivers/gpu/drm/i915/intel_ringbuffer.c
View file

@ -132,6 +132,12 @@ static unsigned int render_ring_get_tail(struct drm_device *dev,
return I915_READ(PRB0_TAIL) & TAIL_ADDR;
}
static inline void render_ring_set_tail(struct drm_device *dev, u32 value)
{
drm_i915_private_t *dev_priv = dev->dev_private;
I915_WRITE(PRB0_TAIL, value);
}
static unsigned int render_ring_get_active_head(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
@ -144,8 +150,7 @@ static unsigned int render_ring_get_active_head(struct drm_device *dev,
static void render_ring_advance_ring(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
drm_i915_private_t *dev_priv = dev->dev_private;
I915_WRITE(PRB0_TAIL, ring->tail);
render_ring_set_tail(dev, ring->tail);
}
static int init_ring_common(struct drm_device *dev,
@ -159,7 +164,7 @@ static int init_ring_common(struct drm_device *dev,
/* Stop the ring if it's running. */
I915_WRITE(ring->regs.ctl, 0);
I915_WRITE(ring->regs.head, 0);
I915_WRITE(ring->regs.tail, 0);
ring->set_tail(dev, 0);
/* Initialize the ring. */
I915_WRITE(ring->regs.start, obj_priv->gtt_offset);
@ -400,6 +405,12 @@ static inline unsigned int bsd_ring_get_tail(struct drm_device *dev,
return I915_READ(BSD_RING_TAIL) & TAIL_ADDR;
}
static inline void bsd_ring_set_tail(struct drm_device *dev, u32 value)
{
drm_i915_private_t *dev_priv = dev->dev_private;
I915_WRITE(BSD_RING_TAIL, value);
}
static inline unsigned int bsd_ring_get_active_head(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
@ -410,8 +421,7 @@ static inline unsigned int bsd_ring_get_active_head(struct drm_device *dev,
static inline void bsd_ring_advance_ring(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
drm_i915_private_t *dev_priv = dev->dev_private;
I915_WRITE(BSD_RING_TAIL, ring->tail);
bsd_ring_set_tail(dev, ring->tail);
}
static int init_bsd_ring(struct drm_device *dev,
@ -817,6 +827,7 @@ static struct intel_ring_buffer render_ring = {
.init = init_render_ring,
.get_head = render_ring_get_head,
.get_tail = render_ring_get_tail,
.set_tail = render_ring_set_tail,
.get_active_head = render_ring_get_active_head,
.advance_ring = render_ring_advance_ring,
.flush = render_ring_flush,
@ -855,6 +866,7 @@ static struct intel_ring_buffer bsd_ring = {
.init = init_bsd_ring,
.get_head = bsd_ring_get_head,
.get_tail = bsd_ring_get_tail,
.set_tail = bsd_ring_set_tail,
.get_active_head = bsd_ring_get_active_head,
.advance_ring = bsd_ring_advance_ring,
.flush = bsd_ring_flush,

2
drivers/gpu/drm/i915/intel_ringbuffer.h
View file

@ -48,6 +48,8 @@ struct intel_ring_buffer {
struct intel_ring_buffer *ring);
unsigned int (*get_tail)(struct drm_device *dev,
struct intel_ring_buffer *ring);
void (*set_tail)(struct drm_device *dev,
u32 value);
unsigned int (*get_active_head)(struct drm_device *dev,
struct intel_ring_buffer *ring);
void (*advance_ring)(struct drm_device *dev,