vulkan/wsi: amend barriers for blit dst buffer

For non-external blit dst buffer, it's bliting the wsi image to a buffer
with mapping populated by vkMapMemory, and it's shared via xcb_put_image
for x11 or memcpy into a shared wl_buffer backed by shm. So we need
additional host stage and host access bit to ensure proper cache flush.
There's no queue family ownership transfer needed.

Reviewed-by: Hans-Kristian Arntzen <post@arntzen-software.no>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35034>

src/vulkan/wsi/wsi_common.c

@@ -1984,12 +1984,24 @@ wsi_cmd_blit_image_to_buffer(VkCommandBuffer cmd_buffer,
    img_mem_barrier.dstAccessMask = 0;
    img_mem_barrier.oldLayout = VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL;
    img_mem_barrier.newLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
+
+   const VkBufferMemoryBarrier buf_mem_barrier = {
+      .sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
+      .pNext = NULL,
+      .srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT,
+      .dstAccessMask = VK_ACCESS_HOST_READ_BIT,
+      .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
+      .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
+      .buffer = image->blit.buffer,
+      .offset = 0,
+      .size = VK_WHOLE_SIZE,
+   };
    wsi->CmdPipelineBarrier(cmd_buffer,
                            VK_PIPELINE_STAGE_TRANSFER_BIT,
-                           VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,
+                           VK_PIPELINE_STAGE_HOST_BIT,
                            0,
                            0, NULL,
-                           0, NULL,
+                           1, &buf_mem_barrier,
                            1, &img_mem_barrier);
 }