diff --git a/src/gallium/auxiliary/util/u_blitter.c b/src/gallium/auxiliary/util/u_blitter.c
index 0d94aaae956..b5b86b72142 100644
--- a/src/gallium/auxiliary/util/u_blitter.c
+++ b/src/gallium/auxiliary/util/u_blitter.c
@@ -87,6 +87,7 @@ struct blitter_context_priv
    void *dsa_write_depth_keep_stencil;
    void *dsa_keep_depth_stencil;
    void *dsa_keep_depth_write_stencil;
+   void *dsa_flush_depth_stencil;
 
    void *velem_state;
 
@@ -156,6 +157,10 @@ struct blitter_context *util_blitter_create(struct pipe_context *pipe)
    ctx->dsa_keep_depth_stencil =
       pipe->create_depth_stencil_alpha_state(pipe, &dsa);
 
+   dsa.depth.writemask = 1;
+   ctx->dsa_flush_depth_stencil =
+      pipe->create_depth_stencil_alpha_state(pipe, &dsa);
+
    dsa.depth.enabled = 1;
    dsa.depth.writemask = 1;
    dsa.depth.func = PIPE_FUNC_ALWAYS;
@@ -940,3 +945,42 @@ void util_blitter_clear_depth_stencil(struct blitter_context *blitter,
                            UTIL_BLITTER_ATTRIB_NONE, NULL);
    blitter_restore_CSOs(ctx);
 }
+
+/* Clear a region of a depth stencil surface. */
+void util_blitter_flush_depth_stencil(struct blitter_context *blitter,
+                                      struct pipe_surface *dstsurf)
+{
+   struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
+   struct pipe_context *pipe = ctx->base.pipe;
+   struct pipe_framebuffer_state fb_state;
+
+   assert(dstsurf->texture);
+   if (!dstsurf->texture)
+      return;
+
+   /* check the saved state */
+   blitter_check_saved_CSOs(ctx);
+   assert(blitter->saved_fb_state.nr_cbufs != ~0);
+
+   /* bind CSOs */
+   pipe->bind_blend_state(pipe, ctx->blend_keep_color);
+   pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_flush_depth_stencil);
+
+   pipe->bind_rasterizer_state(pipe, ctx->rs_state);
+   pipe->bind_fs_state(pipe, blitter_get_fs_col(ctx, 0));
+   pipe->bind_vs_state(pipe, ctx->vs_col);
+   pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
+
+   /* set a framebuffer state */
+   fb_state.width = dstsurf->width;
+   fb_state.height = dstsurf->height;
+   fb_state.nr_cbufs = 0;
+   fb_state.cbufs[0] = 0;
+   fb_state.zsbuf = dstsurf;
+   pipe->set_framebuffer_state(pipe, &fb_state);
+
+   blitter_set_dst_dimensions(ctx, dstsurf->width, dstsurf->height);
+   blitter->draw_rectangle(blitter, 0, 0, dstsurf->width, dstsurf->height, 0,
+                           UTIL_BLITTER_ATTRIB_NONE, NULL);
+   blitter_restore_CSOs(ctx);
+}
diff --git a/src/gallium/auxiliary/util/u_blitter.h b/src/gallium/auxiliary/util/u_blitter.h
index ba3f92eca85..f316587dea0 100644
--- a/src/gallium/auxiliary/util/u_blitter.h
+++ b/src/gallium/auxiliary/util/u_blitter.h
@@ -200,6 +200,8 @@ void util_blitter_clear_depth_stencil(struct blitter_context *blitter,
                                       unsigned dstx, unsigned dsty,
                                       unsigned width, unsigned height);
 
+void util_blitter_flush_depth_stencil(struct blitter_context *blitter,
+                                      struct pipe_surface *dstsurf);
 /* The functions below should be used to save currently bound constant state
  * objects inside a driver. The objects are automatically restored at the end
  * of the util_blitter_{clear, copy_region, fill_region} functions and then
diff --git a/src/gallium/drivers/r300/r300_blit.c b/src/gallium/drivers/r300/r300_blit.c
index d125196b6dc..6f8d9abfc81 100644
--- a/src/gallium/drivers/r300/r300_blit.c
+++ b/src/gallium/drivers/r300/r300_blit.c
@@ -22,6 +22,7 @@
 
 #include "r300_context.h"
 #include "r300_texture.h"
+#include "r300_winsys.h"
 
 #include "util/u_format.h"
 #include "util/u_pack_color.h"
@@ -81,7 +82,7 @@ static void r300_blitter_end(struct r300_context *r300)
 }
 
 static uint32_t r300_depth_clear_cb_value(enum pipe_format format,
-					  const float* rgba)
+                                          const float* rgba)
 {
     union util_color uc;
     util_pack_color(rgba, format, &uc);
@@ -98,6 +99,9 @@ static boolean r300_cbzb_clear_allowed(struct r300_context *r300,
     struct pipe_framebuffer_state *fb =
         (struct pipe_framebuffer_state*)r300->fb_state.state;
 
+    if (r300->z_fastfill)
+        clear_buffers &= ~(PIPE_CLEAR_DEPTH | PIPE_CLEAR_STENCIL);
+
     /* Only color clear allowed, and only one colorbuffer. */
     if (clear_buffers != PIPE_CLEAR_COLOR || fb->nr_cbufs != 1)
         return FALSE;
@@ -105,6 +109,23 @@ static boolean r300_cbzb_clear_allowed(struct r300_context *r300,
     return r300_surface(fb->cbufs[0])->cbzb_allowed;
 }
 
+static uint32_t r300_depth_clear_value(enum pipe_format format,
+                                       double depth, unsigned stencil)
+{
+    switch (format) {
+        case PIPE_FORMAT_Z16_UNORM:
+        case PIPE_FORMAT_X8Z24_UNORM:
+            return util_pack_z(format, depth);
+
+        case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
+            return util_pack_z_stencil(format, depth, stencil);
+
+        default:
+            assert(0);
+            return 0;
+    }
+}
+
 /* Clear currently bound buffers. */
 static void r300_clear(struct pipe_context* pipe,
                        unsigned buffers,
@@ -154,6 +175,22 @@ static void r300_clear(struct pipe_context* pipe,
         (struct r300_hyperz_state*)r300->hyperz_state.state;
     uint32_t width = fb->width;
     uint32_t height = fb->height;
+    boolean has_hyperz = r300->rws->get_value(r300->rws, R300_CAN_HYPERZ);
+    uint32_t hyperz_dcv = 0;
+
+    /* Enable fast Z clear.
+     * The zbuffer must be in micro-tiled mode, otherwise it locks up. */
+    if ((buffers & (PIPE_CLEAR_DEPTH|PIPE_CLEAR_STENCIL)) && has_hyperz) {
+      
+        hyperz_dcv = hyperz->zb_depthclearvalue =
+            r300_depth_clear_value(fb->zsbuf->format, depth, stencil);
+
+        r300_mark_fb_state_dirty(r300, R300_CHANGED_ZCLEAR_FLAG);
+        if (r300->z_compression || r300->z_fastfill)
+            r300->zmask_clear.dirty = TRUE;
+        if (r300->hiz_enable)
+            r300->hiz_clear.dirty = TRUE;
+    }
 
     /* Enable CBZB clear. */
     if (r300_cbzb_clear_allowed(r300, buffers)) {
@@ -181,6 +218,7 @@ static void r300_clear(struct pipe_context* pipe,
     /* Disable CBZB clear. */
     if (r300->cbzb_clear) {
         r300->cbzb_clear = FALSE;
+        hyperz->zb_depthclearvalue = hyperz_dcv;
         r300_mark_fb_state_dirty(r300, R300_CHANGED_CBZB_FLAG);
     }
 
@@ -221,6 +259,29 @@ static void r300_clear_depth_stencil(struct pipe_context *pipe,
     r300_blitter_end(r300);
 }
 
+/* Clear a region of a depth stencil surface. */
+static void r300_flush_depth_stencil(struct pipe_context *pipe,
+                                     struct pipe_resource *dst,
+                                     struct pipe_subresource subdst)
+{
+    struct r300_context *r300 = r300_context(pipe);
+    struct pipe_surface *dstsurf;
+    struct r300_texture *tex = r300_texture(dst);
+
+    /* only flush the zmask if we have one attached to this texture */
+    if (!tex->zmask_mem[subdst.level])
+        return;
+
+    dstsurf = pipe->screen->get_tex_surface(pipe->screen, dst,
+                                            subdst.face, subdst.level, 0,
+                                            PIPE_BIND_DEPTH_STENCIL);
+    r300->z_decomp_rd = TRUE;
+    r300_blitter_begin(r300, R300_CLEAR_SURFACE);
+    util_blitter_flush_depth_stencil(r300->blitter, dstsurf);
+    r300_blitter_end(r300);
+    r300->z_decomp_rd = FALSE;
+}
+
 /* Copy a block of pixels from one surface to another using HW. */
 static void r300_hw_copy_region(struct pipe_context* pipe,
                                 struct pipe_resource *dst,
@@ -252,7 +313,7 @@ static void r300_resource_copy_region(struct pipe_context *pipe,
 {
     enum pipe_format old_format = dst->format;
     enum pipe_format new_format = old_format;
-
+    boolean is_depth;
     if (!pipe->screen->is_format_supported(pipe->screen,
                                            old_format, src->target,
                                            src->nr_samples,
@@ -279,6 +340,10 @@ static void r300_resource_copy_region(struct pipe_context *pipe,
         }
     }
 
+    is_depth = util_format_get_component_bits(src->format, UTIL_FORMAT_COLORSPACE_ZS, 0) != 0;
+    if (is_depth) {
+        r300_flush_depth_stencil(pipe, src, subsrc);
+    }
     if (old_format != new_format) {
         dst->format = new_format;
         src->format = new_format;
diff --git a/src/gallium/drivers/r300/r300_chipset.c b/src/gallium/drivers/r300/r300_chipset.c
index 21f3b9d2610..2df25f9c8ed 100644
--- a/src/gallium/drivers/r300/r300_chipset.c
+++ b/src/gallium/drivers/r300/r300_chipset.c
@@ -36,7 +36,7 @@ void r300_parse_chipset(struct r300_capabilities* caps)
     caps->num_vert_fpus = 2;
     caps->num_tex_units = 16;
     caps->has_tcl = debug_get_bool_option("RADEON_NO_TCL", FALSE) ? FALSE : TRUE;
-    caps->has_hiz = TRUE;
+    caps->hiz_ram = 0;
     caps->is_r400 = FALSE;
     caps->is_r500 = FALSE;
     caps->high_second_pipe = FALSE;
@@ -49,6 +49,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R300;
             caps->high_second_pipe = TRUE;
             caps->num_vert_fpus = 4;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x4145:
@@ -61,6 +63,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R300;
             caps->high_second_pipe = TRUE;
             caps->num_vert_fpus = 4;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x4150:
@@ -77,8 +81,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
         case 0x4E54:
         case 0x4E56:
             caps->family = CHIP_FAMILY_RV350;
-            caps->has_hiz = FALSE;
             caps->high_second_pipe = TRUE;
+            caps->zmask_ram = RV3xx_ZMASK_SIZE;
             break;
 
         case 0x4148:
@@ -91,12 +95,16 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R350;
             caps->high_second_pipe = TRUE;
             caps->num_vert_fpus = 4;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x4E4A:
             caps->family = CHIP_FAMILY_R360;
             caps->high_second_pipe = TRUE;
             caps->num_vert_fpus = 4;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x5460:
@@ -108,8 +116,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
         case 0x5B64:
         case 0x5B65:
             caps->family = CHIP_FAMILY_RV370;
-            caps->has_hiz = FALSE;
             caps->high_second_pipe = TRUE;
+            caps->zmask_ram = RV3xx_ZMASK_SIZE;
             break;
 
         case 0x3150:
@@ -120,6 +128,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
         case 0x3E54:
             caps->family = CHIP_FAMILY_RV380;
             caps->high_second_pipe = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = RV3xx_ZMASK_SIZE;
             break;
 
         case 0x4A48:
@@ -135,6 +145,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R420;
             caps->num_vert_fpus = 6;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x5548:
@@ -149,6 +161,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R423;
             caps->num_vert_fpus = 6;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x554C:
@@ -161,6 +175,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R430;
             caps->num_vert_fpus = 6;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x5D4C:
@@ -172,6 +188,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R480;
             caps->num_vert_fpus = 6;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x4B48:
@@ -182,6 +200,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R481;
             caps->num_vert_fpus = 6;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x5E4C:
@@ -199,34 +219,36 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_RV410;
             caps->num_vert_fpus = 6;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x5954:
         case 0x5955:
             caps->family = CHIP_FAMILY_RS480;
-            caps->has_hiz = FALSE;
             caps->has_tcl = FALSE;
+            caps->zmask_ram = RV3xx_ZMASK_SIZE;
             break;
 
         case 0x5974:
         case 0x5975:
             caps->family = CHIP_FAMILY_RS482;
-            caps->has_hiz = FALSE;
             caps->has_tcl = FALSE;
+            caps->zmask_ram = RV3xx_ZMASK_SIZE;
             break;
 
         case 0x5A41:
         case 0x5A42:
             caps->family = CHIP_FAMILY_RS400;
-            caps->has_hiz = FALSE;
             caps->has_tcl = FALSE;
+            caps->zmask_ram = RV3xx_ZMASK_SIZE;
             break;
 
         case 0x5A61:
         case 0x5A62:
             caps->family = CHIP_FAMILY_RC410;
-            caps->has_hiz = FALSE;
             caps->has_tcl = FALSE;
+            caps->zmask_ram = RV3xx_ZMASK_SIZE;
             break;
 
         case 0x791E:
@@ -234,6 +256,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_RS690;
             caps->has_tcl = FALSE;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x793F:
@@ -242,6 +266,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_RS600;
             caps->has_tcl = FALSE;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x796C:
@@ -251,6 +277,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_RS740;
             caps->has_tcl = FALSE;
             caps->is_r400 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x7100:
@@ -270,6 +298,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R520;
             caps->num_vert_fpus = 8;
             caps->is_r500 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x7140:
@@ -313,6 +343,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_RV515;
             caps->num_vert_fpus = 2;
             caps->is_r500 = TRUE;
+            caps->hiz_ram = R300_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x71C0:
@@ -334,6 +366,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_RV530;
             caps->num_vert_fpus = 5;
             caps->is_r500 = TRUE;
+            caps->hiz_ram = RV530_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x7240:
@@ -354,12 +388,16 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_R580;
             caps->num_vert_fpus = 8;
             caps->is_r500 = TRUE;
+            caps->hiz_ram = RV530_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x7280:
             caps->family = CHIP_FAMILY_RV570;
             caps->num_vert_fpus = 8;
             caps->is_r500 = TRUE;
+            caps->hiz_ram = RV530_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         case 0x7281:
@@ -376,6 +414,8 @@ void r300_parse_chipset(struct r300_capabilities* caps)
             caps->family = CHIP_FAMILY_RV560;
             caps->num_vert_fpus = 8;
             caps->is_r500 = TRUE;
+            caps->hiz_ram = RV530_HIZ_LIMIT;
+            caps->zmask_ram = PIPE_ZMASK_SIZE;
             break;
 
         default:
diff --git a/src/gallium/drivers/r300/r300_chipset.h b/src/gallium/drivers/r300/r300_chipset.h
index 65750f54e71..e7ca642b4f3 100644
--- a/src/gallium/drivers/r300/r300_chipset.h
+++ b/src/gallium/drivers/r300/r300_chipset.h
@@ -25,6 +25,14 @@
 
 #include "pipe/p_compiler.h"
 
+/* these are sizes in dwords */
+#define R300_HIZ_LIMIT 10240
+#define RV530_HIZ_LIMIT 15360
+
+/* rv3xx have only one pipe */
+#define PIPE_ZMASK_SIZE 4096
+#define RV3xx_ZMASK_SIZE 5120
+
 /* Structure containing all the possible information about a specific Radeon
  * in the R3xx, R4xx, and R5xx families. */
 struct r300_capabilities {
@@ -42,8 +50,10 @@ struct r300_capabilities {
     unsigned num_tex_units;
     /* Whether or not TCL is physically present */
     boolean has_tcl;
-    /* Some chipsets do not have HiZ RAM. */
-    boolean has_hiz;
+    /* Some chipsets do not have HiZ RAM - other have varying amounts . */
+    int hiz_ram;
+    /*  some chipsets have zmask ram per pipe some don't */
+    int zmask_ram;
     /* Whether or not this is RV350 or newer, including all r400 and r500
      * chipsets. The differences compared to the oldest r300 chips are:
      * - Blend LTE/GTE thresholds
diff --git a/src/gallium/drivers/r300/r300_context.c b/src/gallium/drivers/r300/r300_context.c
index df903590583..0668fbc151e 100644
--- a/src/gallium/drivers/r300/r300_context.c
+++ b/src/gallium/drivers/r300/r300_context.c
@@ -30,6 +30,7 @@
 #include "r300_cb.h"
 #include "r300_context.h"
 #include "r300_emit.h"
+#include "r300_hyperz.h"
 #include "r300_screen.h"
 #include "r300_screen_buffer.h"
 #include "r300_winsys.h"
@@ -114,6 +115,10 @@ static void r300_destroy_context(struct pipe_context* context)
     u_upload_destroy(r300->upload_vb);
     u_upload_destroy(r300->upload_ib);
 
+    /* setup hyper-z mm */
+    if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
+        r300_hyperz_destroy_mm(r300);
+
     translate_cache_destroy(r300->tran.translate_cache);
 
     r300_release_referenced_objects(r300);
@@ -166,6 +171,8 @@ static void r300_setup_atoms(struct r300_context* r300)
     boolean is_r500 = r300->screen->caps.is_r500;
     boolean has_tcl = r300->screen->caps.has_tcl;
     boolean drm_2_3_0 = r300->rws->get_value(r300->rws, R300_VID_DRM_2_3_0);
+    boolean has_hyperz = r300->rws->get_value(r300->rws, R300_CAN_HYPERZ);
+    boolean has_hiz_ram = r300->screen->caps.hiz_ram > 0;
 
     /* Create the actual atom list.
      *
@@ -188,8 +195,9 @@ static void r300_setup_atoms(struct r300_context* r300)
     R300_INIT_ATOM(gpu_flush, 9);
     R300_INIT_ATOM(aa_state, 4);
     R300_INIT_ATOM(fb_state, 0);
+    if (has_hyperz)
+        R300_INIT_ATOM(hyperz_state, is_rv350 ? 10 : 8);
     /* ZB (unpipelined), SC. */
-    R300_INIT_ATOM(hyperz_state, 6);
     R300_INIT_ATOM(ztop_state, 2);
     /* ZB, FG. */
     R300_INIT_ATOM(dsa_state, is_r500 ? 8 : 6);
@@ -220,6 +228,13 @@ static void r300_setup_atoms(struct r300_context* r300)
     /* TX. */
     R300_INIT_ATOM(texture_cache_inval, 2);
     R300_INIT_ATOM(textures_state, 0);
+    if (has_hyperz) {
+        /* HiZ Clear */
+        if (has_hiz_ram)
+            R300_INIT_ATOM(hiz_clear, 0);
+        /* zmask clear */
+        R300_INIT_ATOM(zmask_clear, 0);
+    }
     /* ZB (unpipelined), SU. */
     R300_INIT_ATOM(query_start, 4);
 
@@ -236,7 +251,8 @@ static void r300_setup_atoms(struct r300_context* r300)
     r300->clip_state.state = CALLOC_STRUCT(r300_clip_state);
     r300->fb_state.state = CALLOC_STRUCT(pipe_framebuffer_state);
     r300->gpu_flush.state = CALLOC_STRUCT(pipe_framebuffer_state);
-    r300->hyperz_state.state = CALLOC_STRUCT(r300_hyperz_state);
+    if (has_hyperz)
+        r300->hyperz_state.state = CALLOC_STRUCT(r300_hyperz_state);
     r300->invariant_state.state = CALLOC_STRUCT(r300_invariant_state);
     r300->rs_block_state.state = CALLOC_STRUCT(r300_rs_block);
     r300->scissor_state.state = CALLOC_STRUCT(pipe_scissor_state);
@@ -282,8 +298,7 @@ static void r300_init_states(struct pipe_context *pipe)
             (struct r300_vap_invariant_state*)r300->vap_invariant_state.state;
     struct r300_invariant_state *invariant =
             (struct r300_invariant_state*)r300->invariant_state.state;
-    struct r300_hyperz_state *hyperz =
-            (struct r300_hyperz_state*)r300->hyperz_state.state;
+
     CB_LOCALS;
 
     pipe->set_blend_color(pipe, &bc);
@@ -350,11 +365,20 @@ static void r300_init_states(struct pipe_context *pipe)
     }
 
     /* Initialize the hyperz state. */
+    if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
     {
-        BEGIN_CB(&hyperz->cb_begin, r300->hyperz_state.size);
+        struct r300_hyperz_state *hyperz =
+            (struct r300_hyperz_state*)r300->hyperz_state.state;
+        BEGIN_CB(&hyperz->cb_flush_begin, r300->hyperz_state.size);
+        OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
+                   R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE);
         OUT_CB_REG(R300_ZB_BW_CNTL, 0);
         OUT_CB_REG(R300_ZB_DEPTHCLEARVALUE, 0);
         OUT_CB_REG(R300_SC_HYPERZ, R300_SC_HYPERZ_ADJ_2);
+
+        if (r300->screen->caps.is_rv350) {
+            OUT_CB_REG(R300_GB_Z_PEQ_CONFIG, 0);
+        }
         END_CB;
     }
 }
@@ -415,6 +439,10 @@ struct pipe_context* r300_create_context(struct pipe_screen* screen,
 
     rws->cs_set_flush(r300->cs, r300_flush_cb, r300);
 
+    /* setup hyper-z mm */
+    if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
+        r300_hyperz_init_mm(r300);
+
     r300->upload_ib = u_upload_create(&r300->context,
 				      32 * 1024, 16,
 				      PIPE_BIND_INDEX_BUFFER);
diff --git a/src/gallium/drivers/r300/r300_context.h b/src/gallium/drivers/r300/r300_context.h
index 7c77a46016d..d86a5c8fc98 100644
--- a/src/gallium/drivers/r300/r300_context.h
+++ b/src/gallium/drivers/r300/r300_context.h
@@ -106,13 +106,19 @@ struct r300_dsa_state {
 };
 
 struct r300_hyperz_state {
+    int current_func; /* -1 after a clear before first op */
+    int flush;
     /* This is actually a command buffer with named dwords. */
+    uint32_t cb_flush_begin;
+    uint32_t zb_zcache_ctlstat;     /* R300_ZB_CACHE_CNTL */
     uint32_t cb_begin;
     uint32_t zb_bw_cntl;            /* R300_ZB_BW_CNTL */
     uint32_t cb_reg1;
     uint32_t zb_depthclearvalue;    /* R300_ZB_DEPTHCLEARVALUE */
     uint32_t cb_reg2;
     uint32_t sc_hyperz;             /* R300_SC_HYPERZ */
+    uint32_t cb_reg3;
+    uint32_t gb_z_peq_config;       /* R300_GB_Z_PEQ_CONFIG: 0x4028 */
 };
 
 struct r300_gpu_flush {
@@ -321,6 +327,7 @@ struct r300_surface {
 
     /* Whether the CBZB clear is allowed on the surface. */
     boolean cbzb_allowed;
+
 };
 
 struct r300_texture_desc {
@@ -387,6 +394,10 @@ struct r300_texture {
     /* All bits should be filled in. */
     struct r300_texture_fb_state fb_state;
 
+    /* hyper-z memory allocs */
+    struct mem_block *hiz_mem[R300_MAX_TEXTURE_LEVELS];
+    struct mem_block *zmask_mem[R300_MAX_TEXTURE_LEVELS];
+
     /* This is the level tiling flags were last time set for.
      * It's used to prevent redundant tiling-flags changes from happening.*/
     unsigned surface_level;
@@ -512,6 +523,10 @@ struct r300_context {
     struct r300_atom texture_cache_inval;
     /* GPU flush. */
     struct r300_atom gpu_flush;
+    /* HiZ clear */
+    struct r300_atom hiz_clear;
+    /* zmask clear */
+    struct r300_atom zmask_clear;
 
     /* Invariant state. This must be emitted to get the engine started. */
     struct r300_atom invariant_state;
@@ -549,8 +564,19 @@ struct r300_context {
     boolean two_sided_color;
     /* Incompatible vertex buffer layout? (misaligned stride or buffer_offset) */
     boolean incompatible_vb_layout;
-
+    /* Whether fast zclear is enabled. */
+    boolean z_fastfill;
+#define R300_Z_COMPRESS_44 1
+#define RV350_Z_COMPRESS_88 2
+    int z_compression;
+    boolean hiz_enable;
     boolean cbzb_clear;
+    boolean z_decomp_rd;
+
+    /* two mem block managers for hiz/zmask ram space */
+    struct mem_block *hiz_mm;
+    struct mem_block *zmask_mm;
+
     /* upload managers */
     struct u_upload_mgr *upload_vb;
     struct u_upload_mgr *upload_ib;
@@ -621,7 +647,8 @@ void r300_plug_in_stencil_ref_fallback(struct r300_context *r300);
 /* r300_state.c */
 enum r300_fb_state_change {
     R300_CHANGED_FB_STATE = 0,
-    R300_CHANGED_CBZB_FLAG
+    R300_CHANGED_CBZB_FLAG,
+    R300_CHANGED_ZCLEAR_FLAG
 };
 
 void r300_mark_fb_state_dirty(struct r300_context *r300,
diff --git a/src/gallium/drivers/r300/r300_debug.c b/src/gallium/drivers/r300/r300_debug.c
index 053a64ea6d7..c3e157e99af 100644
--- a/src/gallium/drivers/r300/r300_debug.c
+++ b/src/gallium/drivers/r300/r300_debug.c
@@ -44,6 +44,7 @@ static const struct debug_named_value debug_options[] = {
     { "notiling", DBG_NO_TILING, "Disable tiling (for benchmarking)" },
     { "noimmd", DBG_NO_IMMD, "Disable immediate mode (for benchmarking)" },
     { "stats", DBG_STATS, "Gather statistics" },
+    { "hyperz", DBG_HYPERZ, "HyperZ (for debugging)" },
 
     /* must be last */
     DEBUG_NAMED_VALUE_END
diff --git a/src/gallium/drivers/r300/r300_emit.c b/src/gallium/drivers/r300/r300_emit.c
index 36a26a78717..17e180a79ac 100644
--- a/src/gallium/drivers/r300/r300_emit.c
+++ b/src/gallium/drivers/r300/r300_emit.c
@@ -25,6 +25,7 @@
 
 #include "util/u_format.h"
 #include "util/u_math.h"
+#include "util/u_mm.h"
 #include "util/u_simple_list.h"
 
 #include "r300_context.h"
@@ -329,6 +330,7 @@ void r300_emit_fb_state(struct r300_context* r300, unsigned size, void* state)
     struct pipe_framebuffer_state* fb = (struct pipe_framebuffer_state*)state;
     struct r300_surface* surf;
     unsigned i;
+    boolean has_hyperz = r300->rws->get_value(r300->rws, R300_CAN_HYPERZ);
     CS_LOCALS(r300);
 
     BEGIN_CS(size);
@@ -364,6 +366,10 @@ void r300_emit_fb_state(struct r300_context* r300, unsigned size, void* state)
 
         OUT_CS_REG_SEQ(R300_ZB_DEPTHPITCH, 1);
         OUT_CS_RELOC(surf->buffer, surf->cbzb_pitch, 0, surf->domain);
+
+        DBG(r300, DBG_CBZB,
+            "CBZB clearing cbuf %08x %08x\n", surf->cbzb_format,
+            surf->cbzb_pitch);
     }
     /* Set up a zbuffer. */
     else if (fb->zsbuf) {
@@ -377,15 +383,32 @@ void r300_emit_fb_state(struct r300_context* r300, unsigned size, void* state)
         OUT_CS_REG_SEQ(R300_ZB_DEPTHPITCH, 1);
         OUT_CS_RELOC(surf->buffer, surf->pitch, 0, surf->domain);
 
-        /* HiZ RAM. */
-        if (r300->screen->caps.has_hiz) {
-            OUT_CS_REG(R300_ZB_HIZ_OFFSET, 0);
-            OUT_CS_REG(R300_ZB_HIZ_PITCH, 0);
-        }
+        if (has_hyperz) {
+            uint32_t surf_pitch;
+            struct r300_texture *tex;
+            int level = surf->base.level;
+            tex = r300_texture(surf->base.texture);
 
-        /* Z Mask RAM. (compressed zbuffer) */
-        OUT_CS_REG(R300_ZB_ZMASK_OFFSET, 0);
-        OUT_CS_REG(R300_ZB_ZMASK_PITCH, 0);
+            surf_pitch = surf->pitch & R300_DEPTHPITCH_MASK;
+            /* HiZ RAM. */
+            if (r300->screen->caps.hiz_ram) {
+                if (tex->hiz_mem[level]) {
+                    OUT_CS_REG(R300_ZB_HIZ_OFFSET, tex->hiz_mem[level]->ofs);
+                    OUT_CS_REG(R300_ZB_HIZ_PITCH, surf_pitch);
+                } else {
+                    OUT_CS_REG(R300_ZB_HIZ_OFFSET, 0);
+                    OUT_CS_REG(R300_ZB_HIZ_PITCH, 0);
+                }
+            }
+            /* Z Mask RAM. (compressed zbuffer) */
+            if (tex->zmask_mem[level]) {
+                OUT_CS_REG(R300_ZB_ZMASK_OFFSET, tex->zmask_mem[level]->ofs);
+                OUT_CS_REG(R300_ZB_ZMASK_PITCH, surf_pitch);
+            } else {
+                OUT_CS_REG(R300_ZB_ZMASK_OFFSET, 0);
+                OUT_CS_REG(R300_ZB_ZMASK_PITCH, 0);
+            }
+        }
     }
 
     END_CS;
@@ -394,8 +417,12 @@ void r300_emit_fb_state(struct r300_context* r300, unsigned size, void* state)
 void r300_emit_hyperz_state(struct r300_context *r300,
                             unsigned size, void *state)
 {
+    struct r300_hyperz_state *z = state;
     CS_LOCALS(r300);
-    WRITE_CS_TABLE(state, size);
+    if (z->flush)
+        WRITE_CS_TABLE(&z->cb_flush_begin, size);
+    else
+        WRITE_CS_TABLE(&z->cb_begin, size - 2);
 }
 
 void r300_emit_hyperz_end(struct r300_context *r300)
@@ -403,9 +430,11 @@ void r300_emit_hyperz_end(struct r300_context *r300)
     struct r300_hyperz_state z =
             *(struct r300_hyperz_state*)r300->hyperz_state.state;
 
+    z.flush = 1;
     z.zb_bw_cntl = 0;
     z.zb_depthclearvalue = 0;
     z.sc_hyperz = R300_SC_HYPERZ_ADJ_2;
+    z.gb_z_peq_config = 0;
 
     r300_emit_hyperz_state(r300, r300->hyperz_state.size, &z);
 }
@@ -943,6 +972,101 @@ void r300_emit_viewport_state(struct r300_context* r300,
     END_CS;
 }
 
+static void r300_emit_hiz_line_clear(struct r300_context *r300, int start, uint16_t count, uint32_t val)
+{
+    CS_LOCALS(r300);
+    BEGIN_CS(4);
+    OUT_CS_PKT3(R300_PACKET3_3D_CLEAR_HIZ, 2);
+    OUT_CS(start);
+    OUT_CS(count);
+    OUT_CS(val);
+    END_CS;
+}
+
+static void r300_emit_zmask_line_clear(struct r300_context *r300, int start, uint16_t count, uint32_t val)
+{
+    CS_LOCALS(r300);
+    BEGIN_CS(4);
+    OUT_CS_PKT3(R300_PACKET3_3D_CLEAR_ZMASK, 2);
+    OUT_CS(start);
+    OUT_CS(count);
+    OUT_CS(val);
+    END_CS;
+}
+
+#define ALIGN_DIVUP(x, y) (((x) + (y) - 1) / (y))
+
+void r300_emit_hiz_clear(struct r300_context *r300, unsigned size, void *state)
+{
+    struct pipe_framebuffer_state *fb =
+        (struct pipe_framebuffer_state*)r300->fb_state.state;
+    struct r300_hyperz_state *z =
+        (struct r300_hyperz_state*)r300->hyperz_state.state;
+    struct r300_screen* r300screen = r300->screen;
+    uint32_t stride, offset = 0, height, offset_shift;
+    struct r300_texture* tex;
+    int i;
+
+    tex = r300_texture(fb->zsbuf->texture);
+    stride = tex->desc.stride_in_pixels[fb->zsbuf->level];
+
+    /* convert from pixels to 4x4 blocks */
+    stride = ALIGN_DIVUP(stride, 4);
+
+    stride = ALIGN_DIVUP(stride, r300screen->caps.num_frag_pipes);    
+    /* there are 4 blocks per dwords */
+    stride = ALIGN_DIVUP(stride, 4);
+
+    height = ALIGN_DIVUP(fb->zsbuf->height, 4);
+
+    offset_shift = 2;
+    offset_shift += (r300screen->caps.num_frag_pipes / 2);
+
+    for (i = 0; i < height; i++) {
+        offset = i * stride;
+        offset <<= offset_shift;
+        r300_emit_hiz_line_clear(r300, offset, stride, 0xffffffff);
+    }
+    z->current_func = -1;
+}
+
+void r300_emit_zmask_clear(struct r300_context *r300, unsigned size, void *state)
+{
+    struct pipe_framebuffer_state *fb =
+        (struct pipe_framebuffer_state*)r300->fb_state.state;
+    struct r300_screen* r300screen = r300->screen;
+    uint32_t stride, offset = 0;
+    struct r300_texture* tex;
+    uint32_t i, height;
+    int mult, offset_shift;
+
+    tex = r300_texture(fb->zsbuf->texture);
+    stride = tex->desc.stride_in_pixels[fb->zsbuf->level];
+
+    if (r300->z_compression == RV350_Z_COMPRESS_88)
+        mult = 8;
+    else
+        mult = 4;
+
+    height = ALIGN_DIVUP(fb->zsbuf->height, mult);
+
+    offset_shift = 4;
+    offset_shift += (r300screen->caps.num_frag_pipes / 2);
+    stride = ALIGN_DIVUP(stride, r300screen->caps.num_frag_pipes);
+
+    /* okay have width in pixels - divide by block width */
+    stride = ALIGN_DIVUP(stride, mult);
+    /* have width in blocks - divide by number of fragment pipes screen width */
+    /* 16 blocks per dword */
+    stride = ALIGN_DIVUP(stride, 16);
+
+    for (i = 0; i < height; i++) {
+        offset = i * stride;
+        offset <<= offset_shift;
+        r300_emit_zmask_line_clear(r300, offset, stride, 0x0);//0xffffffff);
+    }
+}
+
 void r300_emit_ztop_state(struct r300_context* r300,
                           unsigned size, void* state)
 {
diff --git a/src/gallium/drivers/r300/r300_emit.h b/src/gallium/drivers/r300/r300_emit.h
index 5d05039669f..2f2c2f2dcb4 100644
--- a/src/gallium/drivers/r300/r300_emit.h
+++ b/src/gallium/drivers/r300/r300_emit.h
@@ -112,6 +112,9 @@ void r300_emit_texture_cache_inval(struct r300_context* r300, unsigned size, voi
 void r300_emit_invariant_state(struct r300_context *r300,
                                unsigned size, void *state);
 
+void r300_emit_hiz_clear(struct r300_context *r300, unsigned size, void *state);
+void r300_emit_zmask_clear(struct r300_context *r300, unsigned size, void *state);
+
 unsigned r300_get_num_dirty_dwords(struct r300_context *r300);
 
 /* Emit all dirty state. */
diff --git a/src/gallium/drivers/r300/r300_flush.c b/src/gallium/drivers/r300/r300_flush.c
index fe182b6615b..7fed9b5d074 100644
--- a/src/gallium/drivers/r300/r300_flush.c
+++ b/src/gallium/drivers/r300/r300_flush.c
@@ -44,7 +44,8 @@ static void r300_flush(struct pipe_context* pipe,
     u_upload_flush(r300->upload_ib);
 
     if (r300->dirty_hw) {
-        r300_emit_hyperz_end(r300);
+        if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
+            r300_emit_hyperz_end(r300);
         r300_emit_query_end(r300);
 
         r300->flush_counter++;
diff --git a/src/gallium/drivers/r300/r300_hyperz.c b/src/gallium/drivers/r300/r300_hyperz.c
index e9528956019..e719342a462 100644
--- a/src/gallium/drivers/r300/r300_hyperz.c
+++ b/src/gallium/drivers/r300/r300_hyperz.c
@@ -21,25 +21,158 @@
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
 
+#include "util/u_format.h"
+#include "util/u_mm.h"
 #include "r300_context.h"
 #include "r300_hyperz.h"
 #include "r300_reg.h"
 #include "r300_fs.h"
+#include "r300_emit.h"
+#include "r300_texture.h"
 
+/*
+  HiZ rules - taken from various docs 
+   1. HiZ only works on depth values
+   2. Cannot HiZ if stencil fail or zfail is !KEEP
+   3. on R300/400, HiZ is disabled if depth test is EQUAL
+   4. comparison changes without clears usually mean disabling HiZ
+*/
 /*****************************************************************************/
 /* The HyperZ setup                                                          */
 /*****************************************************************************/
 
+static bool r300_get_sc_hz_max(struct r300_context *r300)
+{
+    struct r300_dsa_state *dsa_state = r300->dsa_state.state;
+    int func = dsa_state->z_stencil_control & 0x7;
+    int ret = R300_SC_HYPERZ_MIN;
+
+    if (func >= 4 && func <= 7)
+       ret = R300_SC_HYPERZ_MAX;
+    return ret;
+}
+
+static bool r300_zfunc_same_direction(int func1, int func2)
+{
+    /* func1 is less/lessthan */
+    if (func1 == 1 || func1 == 2)
+        if (func2 == 3 || func2 == 4 || func2 == 5)
+            return FALSE;
+
+    if (func2 == 1 || func2 == 2)
+        if (func1 == 4 || func1 == 5)
+            return FALSE;
+    return TRUE;
+}
+    
+static int r300_get_hiz_min(struct r300_context *r300)
+{
+    struct r300_dsa_state *dsa_state = r300->dsa_state.state;
+    int func = dsa_state->z_stencil_control & 0x7;
+    int ret = R300_HIZ_MIN;
+
+    if (func == 1 || func == 2)
+       ret = R300_HIZ_MAX;
+    return ret;
+}
+
+static boolean r300_dsa_stencil_op_not_keep(struct pipe_stencil_state *s)
+{
+    if (s->enabled && (s->fail_op != PIPE_STENCIL_OP_KEEP ||
+                       s->zfail_op != PIPE_STENCIL_OP_KEEP))
+        return TRUE;
+    return FALSE;
+}
+
+static boolean r300_can_hiz(struct r300_context *r300)
+{
+    struct r300_dsa_state *dsa_state = r300->dsa_state.state;
+    struct pipe_depth_stencil_alpha_state *dsa = &dsa_state->dsa;
+    struct r300_screen* r300screen = r300->screen;
+    struct r300_hyperz_state *z = r300->hyperz_state.state;
+
+    /* shader writes depth - no HiZ */
+    if (r300_fragment_shader_writes_depth(r300_fs(r300))) /* (5) */
+        return FALSE;
+
+    if (r300->query_current)
+        return FALSE;
+    /* if stencil fail/zfail op is not KEEP */
+    if (r300_dsa_stencil_op_not_keep(&dsa->stencil[0]) ||
+        r300_dsa_stencil_op_not_keep(&dsa->stencil[1]))
+        return FALSE;
+
+    if (dsa->depth.enabled) {
+        /* if depth func is EQUAL pre-r500 */
+        if (dsa->depth.func == PIPE_FUNC_EQUAL && !r300screen->caps.is_r500)
+            return FALSE;
+        /* if depth func is NOTEQUAL */
+        if (dsa->depth.func == PIPE_FUNC_NOTEQUAL)
+            return FALSE;
+    }
+    /* depth comparison function - if just cleared save and return okay */
+    if (z->current_func == -1) {
+        int func = dsa_state->z_stencil_control & 0x7;
+        if (func != 0 && func != 7)
+            z->current_func = dsa_state->z_stencil_control & 0x7;
+    } else {
+        /* simple don't change */
+        if (!r300_zfunc_same_direction(z->current_func, (dsa_state->z_stencil_control & 0x7))) {
+            DBG(r300, DBG_HYPERZ, "z func changed direction - disabling hyper-z %d -> %d\n", z->current_func, dsa_state->z_stencil_control);
+            return FALSE;
+        }
+    }    
+    return TRUE;
+}
+
 static void r300_update_hyperz(struct r300_context* r300)
 {
     struct r300_hyperz_state *z =
         (struct r300_hyperz_state*)r300->hyperz_state.state;
 
+    z->gb_z_peq_config = 0;
     z->zb_bw_cntl = 0;
     z->sc_hyperz = R300_SC_HYPERZ_ADJ_2;
+    z->flush = 0;
 
-    if (r300->cbzb_clear)
+    if (r300->cbzb_clear) {
         z->zb_bw_cntl |= R300_ZB_CB_CLEAR_CACHE_LINE_WRITE_ONLY;
+        return;
+    }
+
+    /* Zbuffer compression. */
+    if (r300->z_compression) {
+        z->zb_bw_cntl |= R300_RD_COMP_ENABLE;
+        if (r300->z_decomp_rd == false)
+            z->zb_bw_cntl |= R300_WR_COMP_ENABLE;
+       /* RV350 and up optimizations. */
+       if (r300->z_compression == RV350_Z_COMPRESS_88)
+           z->gb_z_peq_config |= R300_GB_Z_PEQ_CONFIG_Z_PEQ_SIZE_8_8;
+    }
+
+    /* Z fastfill. */
+    if (r300->z_fastfill) {
+        z->zb_bw_cntl |= R300_FAST_FILL_ENABLE; /*  | R300_FORCE_COMPRESSED_STENCIL_VALUE_ENABLE;*/
+    }
+
+    if (r300->hiz_enable) {
+        bool can_hiz = r300_can_hiz(r300);
+        if (can_hiz) {
+            z->zb_bw_cntl |= R300_HIZ_ENABLE;
+            z->sc_hyperz |= R300_SC_HYPERZ_ENABLE;
+            z->sc_hyperz |= r300_get_sc_hz_max(r300);
+            z->zb_bw_cntl |= r300_get_hiz_min(r300);
+        }
+    }
+
+    if (r300->screen->caps.is_r500) {
+        /* XXX Are these bits really available on RV350? */
+        z->zb_bw_cntl |= R500_HIZ_FP_EXP_BITS_3;
+        z->zb_bw_cntl |=
+                R500_HIZ_EQUAL_REJECT_ENABLE |
+                R500_PEQ_PACKING_ENABLE |
+                R500_COVERED_PTR_MASKING_ENABLE;
+    }
 }
 
 /*****************************************************************************/
@@ -126,15 +259,115 @@ static void r300_update_ztop(struct r300_context* r300)
     } else {
         ztop_state->z_buffer_top = R300_ZTOP_ENABLE;
     }
-
     if (ztop_state->z_buffer_top != old_ztop)
         r300->ztop_state.dirty = TRUE;
 }
 
+#define ALIGN_DIVUP(x, y) (((x) + (y) - 1) / (y))
+
+static void r300_update_hiz_clear(struct r300_context *r300)
+{
+    struct pipe_framebuffer_state *fb =
+        (struct pipe_framebuffer_state*)r300->fb_state.state;
+    uint32_t height;
+
+    height = ALIGN_DIVUP(fb->zsbuf->height, 4);
+    r300->hiz_clear.size = height * 4;
+}
+
+static void r300_update_zmask_clear(struct r300_context *r300)
+{
+    struct pipe_framebuffer_state *fb =
+        (struct pipe_framebuffer_state*)r300->fb_state.state;
+    uint32_t height;
+    int mult;
+
+    if (r300->z_compression == RV350_Z_COMPRESS_88)
+        mult = 8;
+    else
+        mult = 4;
+
+    height = ALIGN_DIVUP(fb->zsbuf->height, mult);
+
+    r300->zmask_clear.size = height * 4;
+}
+
 void r300_update_hyperz_state(struct r300_context* r300)
 {
     r300_update_ztop(r300);
     if (r300->hyperz_state.dirty) {
         r300_update_hyperz(r300);
     }
+
+    if (r300->hiz_clear.dirty) {
+       r300_update_hiz_clear(r300);
+    }
+    if (r300->zmask_clear.dirty) {
+       r300_update_zmask_clear(r300);
+    }
+}
+
+void r300_hiz_alloc_block(struct r300_context *r300, struct r300_surface *surf)
+{
+    struct r300_texture *tex;
+    uint32_t zsize, ndw;
+    int level = surf->base.level;
+
+    tex = r300_texture(surf->base.texture);
+
+    if (tex->hiz_mem[level])
+        return;
+
+    zsize = tex->desc.layer_size_in_bytes[level];
+    zsize /= util_format_get_blocksize(tex->desc.b.b.format);
+    ndw = ALIGN_DIVUP(zsize, 64);
+
+    tex->hiz_mem[level] = u_mmAllocMem(r300->hiz_mm, ndw, 0, 0);
+    return;
+}
+
+void r300_zmask_alloc_block(struct r300_context *r300, struct r300_surface *surf, int compress)
+{
+    int bsize = 256;
+    uint32_t zsize, ndw;
+    int level = surf->base.level;
+    struct r300_texture *tex;
+
+    tex = r300_texture(surf->base.texture);
+
+    if (tex->zmask_mem[level])
+        return;
+
+    zsize = tex->desc.layer_size_in_bytes[level];
+    zsize /= util_format_get_blocksize(tex->desc.b.b.format);
+
+    /* each zmask dword represents 16 4x4 blocks - which is 256 pixels
+       or 16 8x8 depending on the gb peq flag = 1024 pixels */
+    if (compress == RV350_Z_COMPRESS_88)
+        bsize = 1024;
+
+    ndw = ALIGN_DIVUP(zsize, bsize);
+    tex->zmask_mem[level] = u_mmAllocMem(r300->zmask_mm, ndw, 0, 0);
+    return;
+}
+
+void r300_hyperz_init_mm(struct r300_context *r300)
+{
+    struct r300_screen* r300screen = r300->screen;
+    int frag_pipes = r300screen->caps.num_frag_pipes;
+
+    if (r300screen->caps.hiz_ram)
+      r300->hiz_mm = u_mmInit(0, r300screen->caps.hiz_ram * frag_pipes);
+
+    r300->zmask_mm = u_mmInit(0, r300screen->caps.zmask_ram * frag_pipes);
+}
+
+void r300_hyperz_destroy_mm(struct r300_context *r300)
+{
+    struct r300_screen* r300screen = r300->screen;
+
+    if (r300screen->caps.hiz_ram)
+      u_mmDestroy(r300->hiz_mm);
+
+    u_mmDestroy(r300->zmask_mm);
 }
diff --git a/src/gallium/drivers/r300/r300_hyperz.h b/src/gallium/drivers/r300/r300_hyperz.h
index 3df5053b896..09e1ff6625c 100644
--- a/src/gallium/drivers/r300/r300_hyperz.h
+++ b/src/gallium/drivers/r300/r300_hyperz.h
@@ -27,4 +27,9 @@ struct r300_context;
 
 void r300_update_hyperz_state(struct r300_context* r300);
 
+void r300_hiz_alloc_block(struct r300_context *r300, struct r300_surface *surf);
+void r300_zmask_alloc_block(struct r300_context *r300, struct r300_surface *surf, int compress);
+
+void r300_hyperz_init_mm(struct r300_context *r300);
+void r300_hyperz_destroy_mm(struct r300_context *r300);
 #endif
diff --git a/src/gallium/drivers/r300/r300_reg.h b/src/gallium/drivers/r300/r300_reg.h
index 2acc1a903e8..99a9d650551 100644
--- a/src/gallium/drivers/r300/r300_reg.h
+++ b/src/gallium/drivers/r300/r300_reg.h
@@ -3436,6 +3436,7 @@ enum {
 #   define R300_VBPNTR_SIZE1(x)    (((x) >> 2) << 16)
 #   define R300_VBPNTR_STRIDE1(x)  (((x) >> 2) << 24)
 
+#define R300_PACKET3_3D_CLEAR_ZMASK         0x00003200
 #define R300_PACKET3_INDX_BUFFER            0x00003300
 #    define R300_INDX_BUFFER_DST_SHIFT          0
 #    define R300_INDX_BUFFER_SKIP_SHIFT         16
diff --git a/src/gallium/drivers/r300/r300_render.c b/src/gallium/drivers/r300/r300_render.c
index 7c4294bc9f5..910f5f7113e 100644
--- a/src/gallium/drivers/r300/r300_render.c
+++ b/src/gallium/drivers/r300/r300_render.c
@@ -223,7 +223,8 @@ static void r300_prepare_for_rendering(struct r300_context *r300,
 
     /* Emitted in flush. */
     end_dwords += 26; /* emit_query_end */
-    end_dwords += r300->hyperz_state.size; /* emit_hyperz_end */
+    if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
+        end_dwords += r300->hyperz_state.size + 2; /* emit_hyperz_end + zcache flush */
 
     cs_dwords += end_dwords;
 
diff --git a/src/gallium/drivers/r300/r300_screen.h b/src/gallium/drivers/r300/r300_screen.h
index 18745b83a09..13a3320b992 100644
--- a/src/gallium/drivers/r300/r300_screen.h
+++ b/src/gallium/drivers/r300/r300_screen.h
@@ -91,6 +91,7 @@ r300_winsys_screen(struct pipe_screen *screen) {
 #define DBG_FB          (1 << 9)
 #define DBG_RS_BLOCK    (1 << 10)
 #define DBG_CBZB        (1 << 11)
+#define DBG_HYPERZ      (1 << 12)
 /* Features. */
 #define DBG_ANISOHQ     (1 << 16)
 #define DBG_NO_TILING   (1 << 17)
diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index a3383c38783..374aa254f09 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -25,6 +25,7 @@
 
 #include "util/u_blitter.h"
 #include "util/u_math.h"
+#include "util/u_mm.h"
 #include "util/u_memory.h"
 #include "util/u_pack_color.h"
 
@@ -43,6 +44,7 @@
 #include "r300_texture.h"
 #include "r300_vs.h"
 #include "r300_winsys.h"
+#include "r300_hyperz.h"
 
 /* r300_state: Functions used to intialize state context by translating
  * Gallium state objects into semi-native r300 state objects. */
@@ -472,14 +474,14 @@ static void*
 
     dsa->dsa = *state;
 
-    /* Depth test setup. */
+    /* Depth test setup. - separate write mask depth for decomp flush */
+    if (state->depth.writemask) {
+        dsa->z_buffer_control |= R300_Z_WRITE_ENABLE;
+    }
+
     if (state->depth.enabled) {
         dsa->z_buffer_control |= R300_Z_ENABLE;
 
-        if (state->depth.writemask) {
-            dsa->z_buffer_control |= R300_Z_WRITE_ENABLE;
-        }
-
         dsa->z_stencil_control |=
             (r300_translate_depth_stencil_function(state->depth.func) <<
                 R300_Z_FUNC_SHIFT);
@@ -592,6 +594,7 @@ static void r300_bind_dsa_state(struct pipe_context* pipe,
 
     UPDATE_STATE(state, r300->dsa_state);
 
+    r300->hyperz_state.dirty = TRUE; /* Will be updated before the emission. */
     r300_dsa_inject_stencilref(r300);
 }
 
@@ -685,7 +688,8 @@ void r300_mark_fb_state_dirty(struct r300_context *r300,
     /* What is marked as dirty depends on the enum r300_fb_state_change. */
     r300->gpu_flush.dirty = TRUE;
     r300->fb_state.dirty = TRUE;
-    r300->hyperz_state.dirty = TRUE;
+    if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
+        r300->hyperz_state.dirty = TRUE;
 
     if (change == R300_CHANGED_FB_STATE) {
         r300->aa_state.dirty = TRUE;
@@ -698,7 +702,7 @@ void r300_mark_fb_state_dirty(struct r300_context *r300,
     if (r300->cbzb_clear)
         r300->fb_state.size += 10;
     else if (state->zsbuf)
-        r300->fb_state.size += r300->screen->caps.has_hiz ? 18 : 14;
+        r300->fb_state.size += r300->screen->caps.hiz_ram ? 18 : 14;
 
     /* The size of the rest of atoms stays the same. */
 }
@@ -710,8 +714,10 @@ static void
     struct r300_context* r300 = r300_context(pipe);
     struct r300_aa_state *aa = (struct r300_aa_state*)r300->aa_state.state;
     struct pipe_framebuffer_state *old_state = r300->fb_state.state;
+    boolean has_hyperz = r300->rws->get_value(r300->rws, R300_CAN_HYPERZ);
     unsigned max_width, max_height, i;
     uint32_t zbuffer_bpp = 0;
+    int blocksize;
 
     if (r300->screen->caps.is_r500) {
         max_width = max_height = 4096;
@@ -743,17 +749,52 @@ static void
 
     r300_mark_fb_state_dirty(r300, R300_CHANGED_FB_STATE);
 
-    /* Polygon offset depends on the zbuffer bit depth. */
+    r300->hiz_enable = false;
+    r300->z_fastfill = false;
+    r300->z_compression = false;
+    
     if (state->zsbuf) {
-        switch (util_format_get_blocksize(state->zsbuf->texture->format)) {
-            case 2:
-                zbuffer_bpp = 16;
-                break;
-            case 4:
-                zbuffer_bpp = 24;
-                break;
+        blocksize = util_format_get_blocksize(state->zsbuf->texture->format);
+        switch (blocksize) {
+        case 2:
+            zbuffer_bpp = 16;
+            break;
+        case 4:
+            zbuffer_bpp = 24;
+            break;
         }
+        if (has_hyperz) {
+            struct r300_surface *zs_surf = r300_surface(state->zsbuf);
+            struct r300_texture *tex;
+            int compress = r300->screen->caps.is_rv350 ? RV350_Z_COMPRESS_88 : R300_Z_COMPRESS_44;
+            int level = zs_surf->base.level;
 
+            tex = r300_texture(zs_surf->base.texture);
+
+            /* work out whether we can support hiz on this buffer */
+            r300_hiz_alloc_block(r300, zs_surf);
+        
+            /* work out whether we can support zmask features on this buffer */
+            r300_zmask_alloc_block(r300, zs_surf, compress);
+
+            if (tex->hiz_mem[level]) {
+                r300->hiz_enable = 1;
+            }
+
+            if (tex->zmask_mem[level]) {
+                r300->z_fastfill = 1;
+                /* compression causes hangs on 16-bit */
+                if (zbuffer_bpp == 24)
+                    r300->z_compression = compress;
+            }
+            DBG(r300, DBG_HYPERZ,
+                "hyper-z features: hiz: %d @ %08x z-compression: %d z-fastfill: %d @ %08x\n", r300->hiz_enable,
+                tex->hiz_mem[level] ? tex->hiz_mem[level]->ofs : 0xdeadbeef,
+                r300->z_compression, r300->z_fastfill,
+                tex->zmask_mem[level] ? tex->zmask_mem[level]->ofs : 0xdeadbeef);
+        }
+            
+        /* Polygon offset depends on the zbuffer bit depth. */
         if (r300->zbuffer_bpp != zbuffer_bpp) {
             r300->zbuffer_bpp = zbuffer_bpp;
 
diff --git a/src/gallium/drivers/r300/r300_state_derived.c b/src/gallium/drivers/r300/r300_state_derived.c
index 66f64f0f6a4..f3dad4c2923 100644
--- a/src/gallium/drivers/r300/r300_state_derived.c
+++ b/src/gallium/drivers/r300/r300_state_derived.c
@@ -35,6 +35,7 @@
 #include "r300_state_inlines.h"
 #include "r300_texture.h"
 #include "r300_vs.h"
+#include "r300_winsys.h"
 
 /* r300_state_derived: Various bits of state which are dependent upon
  * currently bound CSO data. */
@@ -693,5 +694,6 @@ void r300_update_derived_state(struct r300_context* r300)
         }
     }
 
-    r300_update_hyperz_state(r300);
+    if (r300->rws->get_value(r300->rws, R300_CAN_HYPERZ))
+        r300_update_hyperz_state(r300);
 }
diff --git a/src/gallium/drivers/r300/r300_texture.c b/src/gallium/drivers/r300/r300_texture.c
index fcdca5605e9..da8eadd3b53 100644
--- a/src/gallium/drivers/r300/r300_texture.c
+++ b/src/gallium/drivers/r300/r300_texture.c
@@ -35,6 +35,7 @@
 #include "util/u_format_s3tc.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"
+#include "util/u_mm.h"
 
 #include "pipe/p_screen.h"
 
@@ -645,8 +646,16 @@ static void r300_texture_destroy(struct pipe_screen *screen,
 {
     struct r300_texture* tex = (struct r300_texture*)texture;
     struct r300_winsys_screen *rws = (struct r300_winsys_screen *)texture->screen->winsys;
+    int i;
 
     rws->buffer_reference(rws, &tex->buffer, NULL);
+    for (i = 0; i < R300_MAX_TEXTURE_LEVELS; i++) {
+        if (tex->hiz_mem[i])
+            u_mmFreeMem(tex->hiz_mem[i]);
+        if (tex->zmask_mem[i])
+            u_mmFreeMem(tex->zmask_mem[i]);
+    }
+
     FREE(tex);
 }
 
diff --git a/src/gallium/drivers/r300/r300_winsys.h b/src/gallium/drivers/r300/r300_winsys.h
index ff11546a647..e7a1ede4fb4 100644
--- a/src/gallium/drivers/r300/r300_winsys.h
+++ b/src/gallium/drivers/r300/r300_winsys.h
@@ -49,6 +49,7 @@ enum r300_value_id {
     R300_VID_Z_PIPES,
     R300_VID_SQUARE_TILING_SUPPORT,
     R300_VID_DRM_2_3_0,
+    R300_CAN_HYPERZ,
 };
 
 enum r300_reference_domain { /* bitfield */
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;