drm/radeon: add basic zmask/hiz support (v4)

This interface allows userspace to request hyperz support, it probably
needs more locking, and really reporting that you can have hyperz is racy
since someone else might get it before you do.

v2: modify so we pass 0 valued packets to let DDX/r300c keep working.
also fixed incorrect 0x4f1c reference.

v3: fixup zb_bw_cntl so older drivers keep working

v4: add locking, fixup SC_HYPERZ_EN - patch stream to disable hiz

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index dd0a78e954a8..e5b705427389 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -159,6 +159,15 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
                         DRM_DEBUG_KMS("tiling config is r6xx+ only!\n");
                         return -EINVAL;
                 }
+        case RADEON_INFO_WANT_HYPERZ:
+                mutex_lock(&dev->struct_mutex);
+                if (rdev->hyperz_filp)
+                        value = 0;
+                else {
+                        rdev->hyperz_filp = filp;
+                        value = 1;
+                }
+                mutex_unlock(&dev->struct_mutex);
                 break;
         default:
                 DRM_DEBUG_KMS("Invalid request %d\n", info->request);
@@ -199,9 +208,11 @@ void radeon_driver_postclose_kms(struct drm_device *dev,
 void radeon_driver_preclose_kms(struct drm_device *dev,
                                 struct drm_file *file_priv)
 {
+        struct radeon_device *rdev = dev->dev_private;
+        if (rdev->hyperz_filp == file_priv)
+                rdev->hyperz_filp = NULL;
 }
 
-
 /*
  * VBlank related functions.
  */