drm: Unify radeon offset checking.

Replace r300_check_offset() with generic radeon_check_offset(), which doesn't
reject valid offsets when the framebuffer area is at the very end of the card's
32 bit address space. Make radeon_check_and_fixup_offset() use
radeon_check_offset() as well.

This fixes https://bugs.freedesktop.org/show_bug.cgi?id=7697 .

drivers/char/drm/r300_cmdbuf.c

@@ -242,26 +242,6 @@ static __inline__ int r300_check_range(unsigned reg, int count)
 	return 0;
 }
 
-/*
- * we expect offsets passed to the framebuffer to be either within video 
- * memory or within AGP space 
- */
-static __inline__ int r300_check_offset(drm_radeon_private_t *dev_priv,
-					u32 offset)
-{
-	/* we realy want to check against end of video aperture
-	   but this value is not being kept.
-	   This code is correct for now (does the same thing as the
-	   code that sets MC_FB_LOCATION) in radeon_cp.c */
-	if (offset >= dev_priv->fb_location &&
-	    offset < (dev_priv->fb_location + dev_priv->fb_size))
-		return 0;
-	if (offset >= dev_priv->gart_vm_start &&
-	    offset < (dev_priv->gart_vm_start + dev_priv->gart_size))
-		return 0;
-	return 1;
-}
-
 static __inline__ int r300_emit_carefully_checked_packet0(drm_radeon_private_t *
 							  dev_priv,
 							  drm_radeon_kcmd_buffer_t
@@ -290,7 +270,7 @@ static __inline__ int r300_emit_carefully_checked_packet0(drm_radeon_private_t *
 		case MARK_SAFE:
 			break;
 		case MARK_CHECK_OFFSET:
-			if (r300_check_offset(dev_priv, (u32) values[i])) {
+			if (!radeon_check_offset(dev_priv, (u32) values[i])) {
 				DRM_ERROR
 				    ("Offset failed range check (reg=%04x sz=%d)\n",
 				     reg, sz);
@@ -452,7 +432,7 @@ static __inline__ int r300_emit_3d_load_vbpntr(drm_radeon_private_t *dev_priv,
 	i = 1;
 	while ((k < narrays) && (i < (count + 1))) {
 		i++;		/* skip attribute field */
-		if (r300_check_offset(dev_priv, payload[i])) {
+		if (!radeon_check_offset(dev_priv, payload[i])) {
 			DRM_ERROR
 			    ("Offset failed range check (k=%d i=%d) while processing 3D_LOAD_VBPNTR packet.\n",
 			     k, i);
@@ -463,7 +443,7 @@ static __inline__ int r300_emit_3d_load_vbpntr(drm_radeon_private_t *dev_priv,
 		if (k == narrays)
 			break;
 		/* have one more to process, they come in pairs */
-		if (r300_check_offset(dev_priv, payload[i])) {
+		if (!radeon_check_offset(dev_priv, payload[i])) {
 			DRM_ERROR
 			    ("Offset failed range check (k=%d i=%d) while processing 3D_LOAD_VBPNTR packet.\n",
 			     k, i);
@@ -508,7 +488,7 @@ static __inline__ int r300_emit_bitblt_multi(drm_radeon_private_t *dev_priv,
 		if (cmd[1] & (RADEON_GMC_SRC_PITCH_OFFSET_CNTL 
 			      | RADEON_GMC_DST_PITCH_OFFSET_CNTL)) {
 			offset = cmd[2] << 10;
-			ret = r300_check_offset(dev_priv, offset);
+			ret = !radeon_check_offset(dev_priv, offset);
 			if (ret) {
 				DRM_ERROR("Invalid bitblt first offset is %08X\n", offset);
 				return DRM_ERR(EINVAL);
@@ -518,7 +498,7 @@ static __inline__ int r300_emit_bitblt_multi(drm_radeon_private_t *dev_priv,
 		if ((cmd[1] & RADEON_GMC_SRC_PITCH_OFFSET_CNTL) &&
 		    (cmd[1] & RADEON_GMC_DST_PITCH_OFFSET_CNTL)) {
 			offset = cmd[3] << 10;
-			ret = r300_check_offset(dev_priv, offset);
+			ret = !radeon_check_offset(dev_priv, offset);
 			if (ret) {
 				DRM_ERROR("Invalid bitblt second offset is %08X\n", offset);
 				return DRM_ERR(EINVAL);
@@ -551,7 +531,7 @@ static __inline__ int r300_emit_indx_buffer(drm_radeon_private_t *dev_priv,
 		DRM_ERROR("Invalid indx_buffer reg address %08X\n", cmd[1]);
 		return DRM_ERR(EINVAL);
 	}
-	ret = r300_check_offset(dev_priv, cmd[2]);
+	ret = !radeon_check_offset(dev_priv, cmd[2]);
 	if (ret) {
 		DRM_ERROR("Invalid indx_buffer offset is %08X\n", cmd[2]);
 		return DRM_ERR(EINVAL);

drivers/char/drm/radeon_drv.h

@@ -303,6 +303,21 @@ extern int radeon_no_wb;
 extern drm_ioctl_desc_t radeon_ioctls[];
 extern int radeon_max_ioctl;
 
+/* Check whether the given hardware address is inside the framebuffer or the
+ * GART area.
+ */
+static __inline__ int radeon_check_offset(drm_radeon_private_t *dev_priv,
+					  u64 off)
+{
+	u32 fb_start = dev_priv->fb_location;
+	u32 fb_end = fb_start + dev_priv->fb_size - 1;
+	u32 gart_start = dev_priv->gart_vm_start;
+	u32 gart_end = gart_start + dev_priv->gart_size - 1;
+
+	return ((off >= fb_start && off <= fb_end) ||
+		(off >= gart_start && off <= gart_end));
+}
+
 				/* radeon_cp.c */
 extern int radeon_cp_init(DRM_IOCTL_ARGS);
 extern int radeon_cp_start(DRM_IOCTL_ARGS);

drivers/char/drm/radeon_state.c

@@ -43,10 +43,7 @@ static __inline__ int radeon_check_and_fixup_offset(drm_radeon_private_t *
 						    u32 *offset)
 {
 	u64 off = *offset;
-	u32 fb_start = dev_priv->fb_location;
-	u32 fb_end = fb_start + dev_priv->fb_size - 1;
-	u32 gart_start = dev_priv->gart_vm_start;
-	u32 gart_end = gart_start + dev_priv->gart_size - 1;
+	u32 fb_end = dev_priv->fb_location + dev_priv->fb_size - 1;
 	struct drm_radeon_driver_file_fields *radeon_priv;
 
 	/* Hrm ... the story of the offset ... So this function converts
@@ -66,8 +63,7 @@ static __inline__ int radeon_check_and_fixup_offset(drm_radeon_private_t *
 	/* First, the best case, the offset already lands in either the
 	 * framebuffer or the GART mapped space
 	 */
-	if ((off >= fb_start && off <= fb_end) ||
-	    (off >= gart_start && off <= gart_end))
+	if (radeon_check_offset(dev_priv, off))
 		return 0;
 
 	/* Ok, that didn't happen... now check if we have a zero based
@@ -81,11 +77,10 @@ static __inline__ int radeon_check_and_fixup_offset(drm_radeon_private_t *
 
 	/* Finally, assume we aimed at a GART offset if beyond the fb */
 	if (off > fb_end)
-		off = off - fb_end - 1 + gart_start;
+		off = off - fb_end - 1 + dev_priv->gart_vm_start;
 
 	/* Now recheck and fail if out of bounds */
-	if ((off >= fb_start && off <= fb_end) ||
-	    (off >= gart_start && off <= gart_end)) {
+	if (radeon_check_offset(dev_priv, off)) {
 		DRM_DEBUG("offset fixed up to 0x%x\n", (unsigned int)off);
 		*offset = off;
 		return 0;