1 files changed, 333 insertions, 11 deletions

diff --git a/drivers/char/drm/i915_irq.c b/drivers/char/drm/i915_irq.c
index 0d4a162aa385..78c1ae28f17c 100644
--- a/drivers/char/drm/i915_irq.c
+++ b/drivers/char/drm/i915_irq.c
@@ -37,6 +37,178 @@
 
 #define MAX_NOPID ((u32)~0)
 
+/**
+ * Emit blits for scheduled buffer swaps.
+ *
+ * This function will be called with the HW lock held.
+ */
+static void i915_vblank_tasklet(drm_device_t *dev)
+{
+	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+	unsigned long irqflags;
+	struct list_head *list, *tmp, hits, *hit;
+	int nhits, nrects, slice[2], upper[2], lower[2], i;
+	unsigned counter[2] = { atomic_read(&dev->vbl_received),
+				atomic_read(&dev->vbl_received2) };
+	drm_drawable_info_t *drw;
+	drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
+	u32 cpp = dev_priv->cpp;
+	u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
+				XY_SRC_COPY_BLT_WRITE_ALPHA |
+				XY_SRC_COPY_BLT_WRITE_RGB)
+			     : XY_SRC_COPY_BLT_CMD;
+	u32 pitchropcpp = (sarea_priv->pitch * cpp) | (0xcc << 16) |
+			  (cpp << 23) | (1 << 24);
+	RING_LOCALS;
+
+	DRM_DEBUG("\n");
+
+	INIT_LIST_HEAD(&hits);
+
+	nhits = nrects = 0;
+
+	spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
+
+	/* Find buffer swaps scheduled for this vertical blank */
+	list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
+		drm_i915_vbl_swap_t *vbl_swap =
+			list_entry(list, drm_i915_vbl_swap_t, head);
+
+		if ((counter[vbl_swap->pipe] - vbl_swap->sequence) > (1<<23))
+			continue;
+
+		list_del(list);
+		dev_priv->swaps_pending--;
+
+		spin_unlock(&dev_priv->swaps_lock);
+		spin_lock(&dev->drw_lock);
+
+		drw = drm_get_drawable_info(dev, vbl_swap->drw_id);
+
+		if (!drw) {
+			spin_unlock(&dev->drw_lock);
+			drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
+			spin_lock(&dev_priv->swaps_lock);
+			continue;
+		}
+
+		list_for_each(hit, &hits) {
+			drm_i915_vbl_swap_t *swap_cmp =
+				list_entry(hit, drm_i915_vbl_swap_t, head);
+			drm_drawable_info_t *drw_cmp =
+				drm_get_drawable_info(dev, swap_cmp->drw_id);
+
+			if (drw_cmp &&
+			    drw_cmp->rects[0].y1 > drw->rects[0].y1) {
+				list_add_tail(list, hit);
+				break;
+			}
+		}
+
+		spin_unlock(&dev->drw_lock);
+
+		/* List of hits was empty, or we reached the end of it */
+		if (hit == &hits)
+			list_add_tail(list, hits.prev);
+
+		nhits++;
+
+		spin_lock(&dev_priv->swaps_lock);
+	}
+
+	if (nhits == 0) {
+		spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
+		return;
+	}
+
+	spin_unlock(&dev_priv->swaps_lock);
+
+	i915_kernel_lost_context(dev);
+
+	BEGIN_LP_RING(6);
+
+	OUT_RING(GFX_OP_DRAWRECT_INFO);
+	OUT_RING(0);
+	OUT_RING(0);
+	OUT_RING(sarea_priv->width | sarea_priv->height << 16);
+	OUT_RING(sarea_priv->width | sarea_priv->height << 16);
+	OUT_RING(0);
+
+	ADVANCE_LP_RING();
+
+	sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
+
+	upper[0] = upper[1] = 0;
+	slice[0] = max(sarea_priv->pipeA_h / nhits, 1);
+	slice[1] = max(sarea_priv->pipeB_h / nhits, 1);
+	lower[0] = sarea_priv->pipeA_y + slice[0];
+	lower[1] = sarea_priv->pipeB_y + slice[0];
+
+	spin_lock(&dev->drw_lock);
+
+	/* Emit blits for buffer swaps, partitioning both outputs into as many
+	 * slices as there are buffer swaps scheduled in order to avoid tearing
+	 * (based on the assumption that a single buffer swap would always
+	 * complete before scanout starts).
+	 */
+	for (i = 0; i++ < nhits;
+	     upper[0] = lower[0], lower[0] += slice[0],
+	     upper[1] = lower[1], lower[1] += slice[1]) {
+		if (i == nhits)
+			lower[0] = lower[1] = sarea_priv->height;
+
+		list_for_each(hit, &hits) {
+			drm_i915_vbl_swap_t *swap_hit =
+				list_entry(hit, drm_i915_vbl_swap_t, head);
+			drm_clip_rect_t *rect;
+			int num_rects, pipe;
+			unsigned short top, bottom;
+
+			drw = drm_get_drawable_info(dev, swap_hit->drw_id);
+
+			if (!drw)
+				continue;
+
+			rect = drw->rects;
+			pipe = swap_hit->pipe;
+			top = upper[pipe];
+			bottom = lower[pipe];
+
+			for (num_rects = drw->num_rects; num_rects--; rect++) {
+				int y1 = max(rect->y1, top);
+				int y2 = min(rect->y2, bottom);
+
+				if (y1 >= y2)
+					continue;
+
+				BEGIN_LP_RING(8);
+
+				OUT_RING(cmd);
+				OUT_RING(pitchropcpp);
+				OUT_RING((y1 << 16) | rect->x1);
+				OUT_RING((y2 << 16) | rect->x2);
+				OUT_RING(sarea_priv->front_offset);
+				OUT_RING((y1 << 16) | rect->x1);
+				OUT_RING(pitchropcpp & 0xffff);
+				OUT_RING(sarea_priv->back_offset);
+
+				ADVANCE_LP_RING();
+			}
+		}
+	}
+
+	spin_unlock_irqrestore(&dev->drw_lock, irqflags);
+
+	list_for_each_safe(hit, tmp, &hits) {
+		drm_i915_vbl_swap_t *swap_hit =
+			list_entry(hit, drm_i915_vbl_swap_t, head);
+
+		list_del(hit);
+
+		drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
+	}
+}
+
 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 {
 	drm_device_t *dev = (drm_device_t *) arg;
@@ -60,9 +232,26 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 		DRM_WAKEUP(&dev_priv->irq_queue);
 
 	if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
-		atomic_inc(&dev->vbl_received);
+		int vblank_pipe = dev_priv->vblank_pipe;
+
+		if ((vblank_pipe &
+		     (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
+		    == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
+			if (temp & VSYNC_PIPEA_FLAG)
+				atomic_inc(&dev->vbl_received);
+			if (temp & VSYNC_PIPEB_FLAG)
+				atomic_inc(&dev->vbl_received2);
+		} else if (((temp & VSYNC_PIPEA_FLAG) &&
+			    (vblank_pipe & DRM_I915_VBLANK_PIPE_A)) ||
+			   ((temp & VSYNC_PIPEB_FLAG) &&
+			    (vblank_pipe & DRM_I915_VBLANK_PIPE_B)))
+			atomic_inc(&dev->vbl_received);
+
 		DRM_WAKEUP(&dev->vbl_queue);
 		drm_vbl_send_signals(dev);
+
+		if (dev_priv->swaps_pending > 0)
+			drm_locked_tasklet(dev, i915_vblank_tasklet);
 	}
 
 	return IRQ_HANDLED;
@@ -120,7 +309,8 @@ static int i915_wait_irq(drm_device_t * dev, int irq_nr)
 	return ret;
 }
 
-int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
+static int i915_driver_vblank_do_wait(drm_device_t *dev, unsigned int *sequence,
+				      atomic_t *counter)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	unsigned int cur_vblank;
@@ -132,7 +322,7 @@ int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 	}
 
 	DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
-		    (((cur_vblank = atomic_read(&dev->vbl_received))
+		    (((cur_vblank = atomic_read(counter))
 			- *sequence) <= (1<<23)));
 	
 	*sequence = cur_vblank;
@@ -141,6 +331,16 @@ int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 }
 
 
+int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
+{
+	return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received);
+}
+
+int i915_driver_vblank_wait2(drm_device_t *dev, unsigned int *sequence)
+{
+	return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received2);
+}
+
 /* Needs the lock as it touches the ring.
  */
 int i915_irq_emit(DRM_IOCTL_ARGS)
@@ -189,7 +389,7 @@ int i915_irq_wait(DRM_IOCTL_ARGS)
 	return i915_wait_irq(dev, irqwait.irq_seq);
 }
 
-static int i915_enable_interrupt (drm_device_t *dev)
+static void i915_enable_interrupt (drm_device_t *dev)
 {
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 	u16 flag;
@@ -199,13 +399,8 @@ static int i915_enable_interrupt (drm_device_t *dev)
 		flag |= VSYNC_PIPEA_FLAG;
 	if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 		flag |= VSYNC_PIPEB_FLAG;
-	if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
-		DRM_ERROR("%s called with invalid pipe 0x%x\n",
-			  __FUNCTION__, dev_priv->vblank_pipe);
-		return DRM_ERR(EINVAL);
-	}
+
 	I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
-	return 0;
 }
 
 /* Set the vblank monitor pipe
@@ -224,8 +419,17 @@ int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
 	DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
 				 sizeof(pipe));
 
+	if (pipe.pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
+		DRM_ERROR("%s called with invalid pipe 0x%x\n", 
+			  __FUNCTION__, pipe.pipe);
+		return DRM_ERR(EINVAL);
+	}
+
 	dev_priv->vblank_pipe = pipe.pipe;
-	return i915_enable_interrupt (dev);
+
+	i915_enable_interrupt (dev);
+
+	return 0;
 }
 
 int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
@@ -251,6 +455,118 @@ int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
 	return 0;
 }
 
+/**
+ * Schedule buffer swap at given vertical blank.
+ */
+int i915_vblank_swap(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	drm_i915_vblank_swap_t swap;
+	drm_i915_vbl_swap_t *vbl_swap;
+	unsigned int pipe, seqtype, curseq;
+	unsigned long irqflags;
+	struct list_head *list;
+
+	if (!dev_priv) {
+		DRM_ERROR("%s called with no initialization\n", __func__);
+		return DRM_ERR(EINVAL);
+	}
+
+	if (dev_priv->sarea_priv->rotation) {
+		DRM_DEBUG("Rotation not supported\n");
+		return DRM_ERR(EINVAL);
+	}
+
+	DRM_COPY_FROM_USER_IOCTL(swap, (drm_i915_vblank_swap_t __user *) data,
+				 sizeof(swap));
+
+	if (swap.seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
+			     _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS)) {
+		DRM_ERROR("Invalid sequence type 0x%x\n", swap.seqtype);
+		return DRM_ERR(EINVAL);
+	}
+
+	pipe = (swap.seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
+
+	seqtype = swap.seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
+
+	if (!(dev_priv->vblank_pipe & (1 << pipe))) {
+		DRM_ERROR("Invalid pipe %d\n", pipe);
+		return DRM_ERR(EINVAL);
+	}
+
+	spin_lock_irqsave(&dev->drw_lock, irqflags);
+
+	if (!drm_get_drawable_info(dev, swap.drawable)) {
+		spin_unlock_irqrestore(&dev->drw_lock, irqflags);
+		DRM_DEBUG("Invalid drawable ID %d\n", swap.drawable);
+		return DRM_ERR(EINVAL);
+	}
+
+	spin_unlock_irqrestore(&dev->drw_lock, irqflags);
+
+	curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received);
+
+	if (seqtype == _DRM_VBLANK_RELATIVE)
+		swap.sequence += curseq;
+
+	if ((curseq - swap.sequence) <= (1<<23)) {
+		if (swap.seqtype & _DRM_VBLANK_NEXTONMISS) {
+			swap.sequence = curseq + 1;
+		} else {
+			DRM_DEBUG("Missed target sequence\n");
+			return DRM_ERR(EINVAL);
+		}
+	}
+
+	spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
+
+	list_for_each(list, &dev_priv->vbl_swaps.head) {
+		vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
+
+		if (vbl_swap->drw_id == swap.drawable &&
+		    vbl_swap->pipe == pipe &&
+		    vbl_swap->sequence == swap.sequence) {
+			spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
+			DRM_DEBUG("Already scheduled\n");
+			return 0;
+		}
+	}
+
+	spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
+
+	if (dev_priv->swaps_pending >= 100) {
+		DRM_DEBUG("Too many swaps queued\n");
+		return DRM_ERR(EBUSY);
+	}
+
+	vbl_swap = drm_calloc(1, sizeof(vbl_swap), DRM_MEM_DRIVER);
+
+	if (!vbl_swap) {
+		DRM_ERROR("Failed to allocate memory to queue swap\n");
+		return DRM_ERR(ENOMEM);
+	}
+
+	DRM_DEBUG("\n");
+
+	vbl_swap->drw_id = swap.drawable;
+	vbl_swap->pipe = pipe;
+	vbl_swap->sequence = swap.sequence;
+
+	spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
+
+	list_add_tail((struct list_head *)vbl_swap, &dev_priv->vbl_swaps.head);
+	dev_priv->swaps_pending++;
+
+	spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
+
+	DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_swap_t __user *) data, swap,
+			       sizeof(swap));
+
+	return 0;
+}
+
 /* drm_dma.h hooks
 */
 void i915_driver_irq_preinstall(drm_device_t * dev)
@@ -266,6 +582,12 @@ void i915_driver_irq_postinstall(drm_device_t * dev)
 {
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 
+	dev_priv->swaps_lock = SPIN_LOCK_UNLOCKED;
+	INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
+	dev_priv->swaps_pending = 0;
+
+	if (!dev_priv->vblank_pipe)
+		dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A;
 	i915_enable_interrupt(dev);
 	DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 }