[PATCH 3/5]: drm: radeon: Fix ring_rptr accesses.

[David Miller <davem@davemloft.net>]

The memory behind ring_rptr can either be in ioremapped memory
or a vmalloc() normal kernel memory buffer.

However, the code unconditionally uses DRM_{READ,WRITE}32() (and thus
readl() and writel()) to access it.

Basically, if RADEON_IS_AGP then it's ioremap()'d memory else it's
vmalloc'd memory.

Adjust all of the ring_rptr access code as needed.

While we're here, kill the 'scratch' pointer in drm_radeon_private.
It's only used in the one place where it is initialized.

Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/gpu/drm/radeon/radeon_cp.c    |   70 +++++++++++++++++++++++++++------
 drivers/gpu/drm/radeon/radeon_drv.h   |   17 ++++----
 drivers/gpu/drm/radeon/radeon_state.c |    6 +-
 3 files changed, 70 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_cp.c b/drivers/gpu/drm/radeon/radeon_cp.c
index ae4ffa1..9053755 100644
--- a/drivers/gpu/drm/radeon/radeon_cp.c
+++ b/drivers/gpu/drm/radeon/radeon_cp.c
@@ -43,6 +43,52 @@
 static int radeon_do_cleanup_cp(struct drm_device * dev);
 static void radeon_do_cp_start(drm_radeon_private_t * dev_priv);
 
+static u32 radeon_read_ring_rptr(drm_radeon_private_t *dev_priv, u32 off)
+{
+	u32 val;
+
+	if (dev_priv->flags & RADEON_IS_AGP) {
+		val = DRM_READ32(dev_priv->ring_rptr, off);
+	} else {
+		val = *(((volatile u32 *)
+			 dev_priv->ring_rptr->handle) +
+			(off / sizeof(u32)));
+		val = le32_to_cpu(val);
+	}
+	return val;
+}
+
+u32 radeon_get_ring_head(drm_radeon_private_t *dev_priv)
+{
+	if (dev_priv->writeback_works)
+		return radeon_read_ring_rptr(dev_priv, 0);
+	else
+		return RADEON_READ(RADEON_CP_RB_RPTR);
+}
+
+static void radeon_write_ring_rptr(drm_radeon_private_t *dev_priv, u32 off, u32 val)
+{
+	if (dev_priv->flags & RADEON_IS_AGP)
+		DRM_WRITE32(dev_priv->ring_rptr, off, val);
+	else
+		*(((volatile u32 *) dev_priv->ring_rptr->handle) +
+		  (off / sizeof(u32))) = cpu_to_le32(val);
+}
+
+void radeon_set_ring_head(drm_radeon_private_t *dev_priv, u32 val)
+{
+	radeon_write_ring_rptr(dev_priv, 0, val);
+}
+
+u32 radeon_get_scratch(drm_radeon_private_t *dev_priv, int index)
+{
+	if (dev_priv->writeback_works)
+		return radeon_read_ring_rptr(dev_priv,
+					     RADEON_SCRATCHOFF(index));
+	else
+		return RADEON_READ(RADEON_SCRATCH_REG0 + 4*index);
+}
+
 static u32 R500_READ_MCIND(drm_radeon_private_t *dev_priv, int addr)
 {
 	u32 ret;
@@ -647,10 +693,6 @@ static void radeon_cp_init_ring_buffer(struct drm_device * dev,
 	RADEON_WRITE(RADEON_SCRATCH_ADDR, RADEON_READ(RADEON_CP_RB_RPTR_ADDR)
 		     + RADEON_SCRATCH_REG_OFFSET);
 
-	dev_priv->scratch = ((__volatile__ u32 *)
-			     dev_priv->ring_rptr->handle +
-			     (RADEON_SCRATCH_REG_OFFSET / sizeof(u32)));
-
 	RADEON_WRITE(RADEON_SCRATCH_UMSK, 0x7);
 
 	/* Turn on bus mastering */
@@ -668,13 +710,13 @@ static void radeon_cp_init_ring_buffer(struct drm_device * dev,
 		RADEON_WRITE(RADEON_BUS_CNTL, tmp);
 	} /* PCIE cards appears to not need this */
 
-	dev_priv->scratch[0] = 0;
+	radeon_write_ring_rptr(dev_priv, RADEON_SCRATCHOFF(0), 0);
 	RADEON_WRITE(RADEON_LAST_FRAME_REG, 0);
 
-	dev_priv->scratch[1] = 0;
+	radeon_write_ring_rptr(dev_priv, RADEON_SCRATCHOFF(1), 0);
 	RADEON_WRITE(RADEON_LAST_DISPATCH_REG, 0);
 
-	dev_priv->scratch[2] = 0;
+	radeon_write_ring_rptr(dev_priv, RADEON_SCRATCHOFF(2), 0);
 	RADEON_WRITE(RADEON_LAST_CLEAR_REG, 0);
 
 	radeon_do_wait_for_idle(dev_priv);
@@ -698,12 +740,15 @@ static void radeon_test_writeback(drm_radeon_private_t * dev_priv)
 	/* Writeback doesn't seem to work everywhere, test it here and possibly
 	 * enable it if it appears to work
 	 */
-	DRM_WRITE32(dev_priv->ring_rptr, RADEON_SCRATCHOFF(1), 0);
+	radeon_write_ring_rptr(dev_priv, RADEON_SCRATCHOFF(1), 0);
+
 	RADEON_WRITE(RADEON_SCRATCH_REG1, 0xdeadbeef);
 
 	for (tmp = 0; tmp < dev_priv->usec_timeout; tmp++) {
-		if (DRM_READ32(dev_priv->ring_rptr, RADEON_SCRATCHOFF(1)) ==
-		    0xdeadbeef)
+		u32 val;
+
+		val = radeon_read_ring_rptr(dev_priv, RADEON_SCRATCHOFF(1));
+		if (val == 0xdeadbeef)
 			break;
 		DRM_UDELAY(1);
 	}
@@ -1540,7 +1585,7 @@ struct drm_buf *radeon_freelist_get(struct drm_device * dev)
 	start = dev_priv->last_buf;
 
 	for (t = 0; t < dev_priv->usec_timeout; t++) {
-		u32 done_age = GET_SCRATCH(1);
+		u32 done_age = GET_SCRATCH(dev_priv, 1);
 		DRM_DEBUG("done_age = %d\n", done_age);
 		for (i = start; i < dma->buf_count; i++) {
 			buf = dma->buflist[i];
@@ -1574,8 +1619,9 @@ struct drm_buf *radeon_freelist_get(struct drm_device * dev)
 	struct drm_buf *buf;
 	int i, t;
 	int start;
-	u32 done_age = DRM_READ32(dev_priv->ring_rptr, RADEON_SCRATCHOFF(1));
+	u32 done_age;
 
+	done_age = radeon_read_ring_rptr(dev_priv, RADEON_SCRATCHOFF(1));
 	if (++dev_priv->last_buf >= dma->buf_count)
 		dev_priv->last_buf = 0;
 
diff --git a/drivers/gpu/drm/radeon/radeon_drv.h b/drivers/gpu/drm/radeon/radeon_drv.h
index c608e22..a253cf0 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.h
+++ b/drivers/gpu/drm/radeon/radeon_drv.h
@@ -160,10 +160,6 @@ enum radeon_chip_flags {
 	RADEON_IS_IGPGART = 0x01000000UL,
 };
 
-#define GET_RING_HEAD(dev_priv)	(dev_priv->writeback_works ? \
-        DRM_READ32(  (dev_priv)->ring_rptr, 0 ) : RADEON_READ(RADEON_CP_RB_RPTR))
-#define SET_RING_HEAD(dev_priv,val)	DRM_WRITE32( (dev_priv)->ring_rptr, 0, (val) )
-
 typedef struct drm_radeon_freelist {
 	unsigned int age;
 	struct drm_buf *buf;
@@ -248,7 +244,6 @@ typedef struct drm_radeon_private {
 	drm_radeon_freelist_t *head;
 	drm_radeon_freelist_t *tail;
 	int last_buf;
-	volatile u32 *scratch;
 	int writeback_works;
 
 	int usec_timeout;
@@ -338,6 +333,12 @@ extern int radeon_no_wb;
 extern struct drm_ioctl_desc radeon_ioctls[];
 extern int radeon_max_ioctl;
 
+extern u32 radeon_get_ring_head(drm_radeon_private_t *dev_priv);
+extern void radeon_set_ring_head(drm_radeon_private_t *dev_priv, u32 val);
+
+#define GET_RING_HEAD(dev_priv)	radeon_get_ring_head(dev_priv)
+#define SET_RING_HEAD(dev_priv, val) radeon_set_ring_head(dev_priv, val)
+
 /* Check whether the given hardware address is inside the framebuffer or the
  * GART area.
  */
@@ -639,9 +640,9 @@ extern int r300_do_cp_cmdbuf(struct drm_device *dev,
 
 #define RADEON_SCRATCHOFF( x )		(RADEON_SCRATCH_REG_OFFSET + 4*(x))
 
-#define GET_SCRATCH( x )	(dev_priv->writeback_works			\
-				? DRM_READ32( dev_priv->ring_rptr, RADEON_SCRATCHOFF(x) ) \
-				: RADEON_READ( RADEON_SCRATCH_REG0 + 4*(x) ) )
+extern u32 radeon_get_scratch(drm_radeon_private_t *dev_priv, int index);
+
+#define GET_SCRATCH(dev_priv, x) radeon_get_scratch(dev_priv, x)
 
 #define RADEON_GEN_INT_CNTL		0x0040
 #	define RADEON_CRTC_VBLANK_MASK		(1 << 0)
diff --git a/drivers/gpu/drm/radeon/radeon_state.c b/drivers/gpu/drm/radeon/radeon_state.c
index ef940a0..03fea43 100644
--- a/drivers/gpu/drm/radeon/radeon_state.c
+++ b/drivers/gpu/drm/radeon/radeon_state.c
@@ -3010,14 +3010,14 @@ static int radeon_cp_getparam(struct drm_device *dev, void *data, struct drm_fil
 		break;
 	case RADEON_PARAM_LAST_FRAME:
 		dev_priv->stats.last_frame_reads++;
-		value = GET_SCRATCH(0);
+		value = GET_SCRATCH(dev_priv, 0);
 		break;
 	case RADEON_PARAM_LAST_DISPATCH:
-		value = GET_SCRATCH(1);
+		value = GET_SCRATCH(dev_priv, 1);
 		break;
 	case RADEON_PARAM_LAST_CLEAR:
 		dev_priv->stats.last_clear_reads++;
-		value = GET_SCRATCH(2);
+		value = GET_SCRATCH(dev_priv, 2);
 		break;
 	case RADEON_PARAM_IRQ_NR:
 		value = drm_dev_to_irq(dev);
-- 
1.6.1.2.350.g88cc