r300g: implement hyper-z support. (v4)

This implements fast Z clear, Z compression, and HiZ support for r300->r500
GPUs.

It also allows cbzb clears when fast Z clears are being used for the ZB.

It requires a kernel with hyper-z support.

Thanks to Marek Olšák <maraeo@gmail.com>, who started this off, and Alex Deucher at AMD for providing lots of hints.

v2:
squashed zmask ram size fix]
squashed r300g/blitter: fix Z readback when compressed]

v3:
rebase around texture changes in master - .1 fix more bits

v4:
migrated to using u_mm in r300_texture to manage hiz/zmask rams consistently
disabled HiZ when using OQ
flush z-cache before turning hyper-z off
update hyper-z state on dsa state change
store depthclearvalue across cbzb clears and replace it afterwards.

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

3 files changed, 15 insertions, 0 deletions

diff --git a/src/gallium/winsys/radeon/drm/radeon_drm.c b/src/gallium/winsys/radeon/drm/radeon_drm.c
index e9a276362f3..e7057ca593b 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm.c
@@ -130,6 +130,16 @@ static void do_ioctls(int fd, struct radeon_libdrm_winsys* winsys)
     }
     winsys->z_pipes = target;
 
+    winsys->hyperz = FALSE;
+#ifndef RADEON_INFO_WANT_HYPERZ
+#define RADEON_INFO_WANT_HYPERZ 7
+#endif
+    info.request = RADEON_INFO_WANT_HYPERZ;
+    retval = drmCommandWriteRead(fd, DRM_RADEON_INFO, &info, sizeof(info));
+    if (!retval && target == 1) {
+        winsys->hyperz = TRUE;
+    }
+
     retval = drmCommandWriteRead(fd, DRM_RADEON_GEM_INFO,
             &gem_info, sizeof(gem_info));
     if (retval) {
diff --git a/src/gallium/winsys/radeon/drm/radeon_r300.c b/src/gallium/winsys/radeon/drm/radeon_r300.c
index 55445040671..955ae4c0455 100644
--- a/src/gallium/winsys/radeon/drm/radeon_r300.c
+++ b/src/gallium/winsys/radeon/drm/radeon_r300.c
@@ -211,6 +211,8 @@ static uint32_t radeon_get_value(struct r300_winsys_screen *rws,
         return ws->squaretiling;
     case R300_VID_DRM_2_3_0:
         return ws->drm_2_3_0;
+    case R300_CAN_HYPERZ:
+        return ws->hyperz;
     }
     return 0;
 }
diff --git a/src/gallium/winsys/radeon/drm/radeon_winsys.h b/src/gallium/winsys/radeon/drm/radeon_winsys.h
index 533b7b2e2d2..52db0d62d23 100644
--- a/src/gallium/winsys/radeon/drm/radeon_winsys.h
+++ b/src/gallium/winsys/radeon/drm/radeon_winsys.h
@@ -65,6 +65,9 @@ struct radeon_libdrm_winsys {
      */
     boolean drm_2_3_0;
 
+    /* hyperz user */
+    boolean hyperz;
+
     /* DRM FD */
     int fd;