5 files changed, 40 insertions, 14 deletions

diff --git a/drivers/gpu/drm/radeon/r300.c b/drivers/gpu/drm/radeon/r300.c
index 36b4f7b48d6a..23fee54c3b75 100644
--- a/drivers/gpu/drm/radeon/r300.c
+++ b/drivers/gpu/drm/radeon/r300.c
@@ -745,6 +745,11 @@ static int r300_packet0_check(struct radeon_cs_parser *p,
                 break;
         case 0x4E00:
                 /* RB3D_CCTL */
+                if ((idx_value & (1 << 10)) && /* CMASK_ENABLE */
+                    p->rdev->cmask_filp != p->filp) {
+                        DRM_ERROR("Invalid RB3D_CCTL: Cannot enable CMASK.\n");
+                        return -EINVAL;
+                }
                 track->num_cb = ((idx_value >> 5) & 0x3) + 1;
                 break;
         case 0x4E38:
@@ -1206,6 +1211,10 @@ static int r300_packet3_check(struct radeon_cs_parser *p,
                 if (p->rdev->hyperz_filp != p->filp)
                         return -EINVAL;
                 break;
+        case PACKET3_3D_CLEAR_CMASK:
+                if (p->rdev->cmask_filp != p->filp)
+                        return -EINVAL;
+                break;
         case PACKET3_NOP:
                 break;
         default:
diff --git a/drivers/gpu/drm/radeon/r300d.h b/drivers/gpu/drm/radeon/r300d.h
index 0c036c60d9df..1f519a5ffb8c 100644
--- a/drivers/gpu/drm/radeon/r300d.h
+++ b/drivers/gpu/drm/radeon/r300d.h
@@ -54,6 +54,7 @@
 #define         PACKET3_3D_DRAW_IMMD_2          0x35
 #define         PACKET3_3D_DRAW_INDX_2          0x36
 #define         PACKET3_3D_CLEAR_HIZ            0x37
+#define         PACKET3_3D_CLEAR_CMASK          0x38
 #define         PACKET3_BITBLT_MULTI            0x9B
 
 #define PACKET0(reg, n) (CP_PACKET0 |                                   \
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 140eaceab279..a835d95021d1 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1168,8 +1168,9 @@ struct radeon_device {
         uint8_t                 audio_category_code;
 
         struct notifier_block acpi_nb;
-        /* only one userspace can use Hyperz features at a time */
+        /* only one userspace can use Hyperz features or CMASK at a time */
         struct drm_file *hyperz_filp;
+        struct drm_file *cmask_filp;
         /* i2c buses */
         struct radeon_i2c_chan *i2c_bus[RADEON_MAX_I2C_BUS];
 };
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 18225f21ee0f..be5cb4f28c29 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -48,7 +48,7 @@
  * - 2.5.0 - add get accel 2 to work around ddx breakage for evergreen
  * - 2.6.0 - add tiling config query (r6xx+), add initial HiZ support (r300->r500)
  *   2.7.0 - fixups for r600 2D tiling support. (no external ABI change), add eg dyn gpr regs
- *   2.8.0 - pageflip support, r500 US_FORMAT regs. r500 ARGB2101010 colorbuf
+ *   2.8.0 - pageflip support, r500 US_FORMAT regs. r500 ARGB2101010 colorbuf, r300->r500 CMASK
  */
 #define KMS_DRIVER_MAJOR        2
 #define KMS_DRIVER_MINOR        8
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index b2686334d46b..28a53e4a925f 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -96,9 +96,27 @@ out:
         return r;
 }
 
+static void radeon_set_filp_rights(struct drm_device *dev,
+                                   struct drm_file **owner,
+                                   struct drm_file *applier,
+                                   uint32_t *value)
+{
+        mutex_lock(&dev->struct_mutex);
+        if (*value == 1) {
+                /* wants rights */
+                if (!*owner)
+                        *owner = applier;
+        } else if (*value == 0) {
+                /* revokes rights */
+                if (*owner == applier)
+                        *owner = NULL;
+        }
+        *value = *owner == applier ? 1 : 0;
+        mutex_unlock(&dev->struct_mutex);
+}
 
 /*
- * Userspace get informations ioctl
+ * Userspace get information ioctl
  */
 int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 {
@@ -173,18 +191,15 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
                         DRM_DEBUG_KMS("WANT_HYPERZ: invalid value %d\n", value);
                         return -EINVAL;
                 }
-                mutex_lock(&dev->struct_mutex);
-                if (value == 1) {
-                        /* wants hyper-z */
-                        if (!rdev->hyperz_filp)
-                                rdev->hyperz_filp = filp;
-                } else if (value == 0) {
-                        /* revokes hyper-z */
-                        if (rdev->hyperz_filp == filp)
-                                rdev->hyperz_filp = NULL;
+                radeon_set_filp_rights(dev, &rdev->hyperz_filp, filp, &value);
+                break;
+        case RADEON_INFO_WANT_CMASK:
+                /* The same logic as Hyper-Z. */
+                if (value >= 2) {
+                        DRM_DEBUG_KMS("WANT_CMASK: invalid value %d\n", value);
+                        return -EINVAL;
                 }
-                value = rdev->hyperz_filp == filp ?  1 : 0;
-                mutex_unlock(&dev->struct_mutex);
+                radeon_set_filp_rights(dev, &rdev->cmask_filp, filp, &value);
                 break;
         default:
                 DRM_DEBUG_KMS("Invalid request %d\n", info->request);