turnip: add support to clear LRZ

v2:

* Don't emit tu6_clear_lrz() using a IB but in the command stream
provided. (Jonathan Marek)
* Valid_clear_ib is always false if TU_DEBUG_NOLRZ is set. Remove the
useless condition. (Jonathan Marek)
* Added more comments.
* Use r2d function for blitting LRZ. (Jonathan Marek)

v3:
* Do LRZ tracking in the command buffer state (Connor).

v4:

* Simplify the emission of source setup (Jonathan Marek)

v5:

* Separate LRZ setup in a different function.
* Not hide LRZ setup inside GMEM path (Jonathan Marek)
* Fix iova address emission in tu6_clear_lrz() (Jonathan Marek)
* Add CCU sysmem flushes (Jonathan Marek)

v6:

* Fixed bug related to storing a VkClearValue pointer that could be
  out-of-scope when we access to it for emitting LRZ clear.

v7:

* Merge tu6_clear_lrz() and tu6_clear_lrz_setup() into the same
function and emit LRZ clear at the beginning of the renderpass.

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5146>

src/freedreno/vulkan/tu_clear_blit.c

@@ -914,6 +914,24 @@ copy_format(VkFormat format, VkImageAspectFlags aspect_mask, bool copy_buffer)
    }
 }
 
+void
+tu6_clear_lrz(struct tu_cmd_buffer *cmd,
+              struct tu_cs *cs,
+              struct tu_image *image,
+              const VkClearValue *value)
+{
+   const struct blit_ops *ops = &r2d_ops;
+
+   ops->setup(cmd, cs, VK_FORMAT_D16_UNORM, VK_IMAGE_ASPECT_DEPTH_BIT, ROTATE_0, true, false);
+   ops->clear_value(cs, VK_FORMAT_D16_UNORM, value);
+   ops->dst_buffer(cs, VK_FORMAT_D16_UNORM,
+                   image->bo->iova + image->bo_offset + image->lrz_offset,
+                   image->lrz_pitch * 2);
+   ops->coords(cs, &(VkOffset2D) {}, NULL, &(VkExtent2D) {image->lrz_pitch, image->lrz_height});
+   ops->run(cmd, cs);
+   ops->teardown(cmd, cs);
+}
+
 static void
 tu_image_view_copy_blit(struct tu_image_view *iview,
                         struct tu_image *image,

src/freedreno/vulkan/tu_cmd_buffer.c

@@ -1205,8 +1205,6 @@ tu6_tile_render_begin(struct tu_cmd_buffer *cmd, struct tu_cs *cs)
 
    tu6_emit_event_write(cmd, cs, LRZ_FLUSH);
 
-   /* lrz clear? */
-
    tu_cs_emit_pkt7(cs, CP_SKIP_IB2_ENABLE_GLOBAL, 1);
    tu_cs_emit(cs, 0x0);
 
@@ -2922,6 +2920,9 @@ tu_CmdBeginRenderPass2(VkCommandBuffer commandBuffer,
           (att->clear_mask & (VK_IMAGE_ASPECT_COLOR_BIT | VK_IMAGE_ASPECT_DEPTH_BIT))) {
          cmd->state.lrz.image = image;
          cmd->state.lrz.valid = true;
+
+         tu6_clear_lrz(cmd, &cmd->cs, image, &pRenderPassBegin->pClearValues[a]);
+         tu6_emit_event_write(cmd, &cmd->cs, PC_CCU_FLUSH_COLOR_TS);
       } else {
          cmd->state.lrz.valid = false;
       }

src/freedreno/vulkan/tu_private.h

@@ -1145,6 +1145,9 @@ tu6_emit_viewport(struct tu_cs *cs, const VkViewport *viewport, uint32_t num_vie
 void
 tu6_emit_scissor(struct tu_cs *cs, const VkRect2D *scs, uint32_t scissor_count);
 
+void
+tu6_clear_lrz(struct tu_cmd_buffer *cmd, struct tu_cs *cs, struct tu_image* image, const VkClearValue *value);
+
 void
 tu6_emit_sample_locations(struct tu_cs *cs, const VkSampleLocationsInfoEXT *samp_loc);