drm/i915: implement BSD ring buffer V2

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>

1 files changed, 153 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 5715c4d8cce9..f6b84fe8099a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -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,}
+};