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drm/i915: implement BSD ring buffer V2

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The BSD (bit stream decoder) ring is used for accessing the BSD engine
which decodes video bitstream for H.264 and VC1 on G45+.  It is
asynchronous with the render ring and has access to separate parts of
the GPU from it, though the render cache is coherent between the two.

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Xiang Hai hao <haihao.xiang@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Zou Nan hai
2010-05-21 09:08:57 +08:00
committed by Eric Anholt
parent 852835f343
commit d1b851fc0d
6 changed files with 276 additions and 15 deletions
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153
drivers/gpu/drm/i915/intel_ringbuffer.c
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@@ -340,6 +340,119 @@ static void render_setup_status_page(struct drm_device *dev,
}
void
bsd_ring_flush(struct drm_device *dev,
struct intel_ring_buffer *ring,
u32 invalidate_domains,
u32 flush_domains)
{
intel_ring_begin(dev, ring, 8);
intel_ring_emit(dev, ring, MI_FLUSH);
intel_ring_emit(dev, ring, MI_NOOP);
intel_ring_advance(dev, ring);
}
static inline unsigned int bsd_ring_get_head(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
drm_i915_private_t *dev_priv = dev->dev_private;
return I915_READ(BSD_RING_HEAD) & HEAD_ADDR;
}
static inline unsigned int bsd_ring_get_tail(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
drm_i915_private_t *dev_priv = dev->dev_private;
return I915_READ(BSD_RING_TAIL) & TAIL_ADDR;
}
static inline unsigned int bsd_ring_get_active_head(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
drm_i915_private_t *dev_priv = dev->dev_private;
return I915_READ(BSD_RING_ACTHD);
}
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);
}
static int init_bsd_ring(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
return init_ring_common(dev, ring);
}
static u32
bsd_ring_add_request(struct drm_device *dev,
struct intel_ring_buffer *ring,
struct drm_file *file_priv,
u32 flush_domains)
{
u32 seqno;
seqno = intel_ring_get_seqno(dev, ring);
intel_ring_begin(dev, ring, 4);
intel_ring_emit(dev, ring, MI_STORE_DWORD_INDEX);
intel_ring_emit(dev, ring,
I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
intel_ring_emit(dev, ring, seqno);
intel_ring_emit(dev, ring, MI_USER_INTERRUPT);
intel_ring_advance(dev, ring);
DRM_DEBUG_DRIVER("%s %d\n", ring->name, seqno);
return seqno;
}
static void bsd_setup_status_page(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
drm_i915_private_t *dev_priv = dev->dev_private;
I915_WRITE(BSD_HWS_PGA, ring->status_page.gfx_addr);
I915_READ(BSD_HWS_PGA);
}
static void
bsd_ring_get_user_irq(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
/* do nothing */
}
static void
bsd_ring_put_user_irq(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
/* do nothing */
}
static u32
bsd_ring_get_gem_seqno(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
}
static int
bsd_ring_dispatch_gem_execbuffer(struct drm_device *dev,
struct intel_ring_buffer *ring,
struct drm_i915_gem_execbuffer2 *exec,
struct drm_clip_rect *cliprects,
uint64_t exec_offset)
{
uint32_t exec_start;
exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
intel_ring_begin(dev, ring, 2);
intel_ring_emit(dev, ring, MI_BATCH_BUFFER_START |
(2 << 6) | MI_BATCH_NON_SECURE_I965);
intel_ring_emit(dev, ring, exec_start);
intel_ring_advance(dev, ring);
return 0;
}
static int
render_ring_dispatch_gem_execbuffer(struct drm_device *dev,
struct intel_ring_buffer *ring,
@@ -588,6 +701,7 @@ int intel_wait_ring_buffer(struct drm_device *dev,
if (master_priv->sarea_priv)
master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
}
yield();
} while (!time_after(jiffies, end));
trace_i915_ring_wait_end (dev);
@@ -682,3 +796,42 @@ struct intel_ring_buffer render_ring = {
.status_page = {NULL, 0, NULL},
.map = {0,}
};
/* ring buffer for bit-stream decoder */
struct intel_ring_buffer bsd_ring = {
.name = "bsd ring",
.regs = {
.ctl = BSD_RING_CTL,
.head = BSD_RING_HEAD,
.tail = BSD_RING_TAIL,
.start = BSD_RING_START
},
.ring_flag = I915_EXEC_BSD,
.size = 32 * PAGE_SIZE,
.alignment = PAGE_SIZE,
.virtual_start = NULL,
.dev = NULL,
.gem_object = NULL,
.head = 0,
.tail = 0,
.space = 0,
.next_seqno = 1,
.user_irq_refcount = 0,
.irq_gem_seqno = 0,
.waiting_gem_seqno = 0,
.setup_status_page = bsd_setup_status_page,
.init = init_bsd_ring,
.get_head = bsd_ring_get_head,
.get_tail = bsd_ring_get_tail,
.get_active_head = bsd_ring_get_active_head,
.advance_ring = bsd_ring_advance_ring,
.flush = bsd_ring_flush,
.add_request = bsd_ring_add_request,
.get_gem_seqno = bsd_ring_get_gem_seqno,
.user_irq_get = bsd_ring_get_user_irq,
.user_irq_put = bsd_ring_put_user_irq,
.dispatch_gem_execbuffer = bsd_ring_dispatch_gem_execbuffer,
.status_page = {NULL, 0, NULL},
.map = {0,}
};