pvr: Add support to copy a control stream to another control stream.

Signed-off-by: Rajnesh Kanwal <rajnesh.kanwal@imgtec.com>
Reviewed-by: Karmjit Mahil <Karmjit.Mahil@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18871>

src/imagination/vulkan/pvr_csb.c

@@ -30,6 +30,7 @@
 #include <assert.h>
 #include <stdbool.h>
 #include <stdint.h>
+#include <string.h>
 #include <vulkan/vulkan.h>
 
 #include "hwdef/rogue_hw_utils.h"
@@ -37,6 +38,8 @@
 #include "pvr_csb.h"
 #include "pvr_device_info.h"
 #include "pvr_private.h"
+#include "util/list.h"
+#include "util/u_dynarray.h"
 #include "vk_log.h"
 
 /**
@@ -131,7 +134,7 @@ static bool pvr_csb_buffer_extend(struct pvr_csb *csb)
 {
    const uint8_t stream_link_space = (pvr_cmd_length(VDMCTRL_STREAM_LINK0) +
                                       pvr_cmd_length(VDMCTRL_STREAM_LINK1)) *
-                                     4;
+                                     sizeof(uint32_t);
    const uint32_t cache_line_size =
       rogue_get_slc_cache_line_size(&csb->device->pdevice->dev_info);
    struct pvr_bo *pvr_bo;
@@ -220,6 +223,52 @@ void *pvr_csb_alloc_dwords(struct pvr_csb *csb, uint32_t num_dwords)
    return p;
 }
 
+/**
+ * \brief Copies control stream words from src csb into dst csb.
+ *
+ * The intended use is to copy PVR_CMD_STREAM_TYPE_GRAPHICS_DEFERRED type
+ * control stream into PVR_CMD_STREAM_TYPE_GRAPHICS type device accessible
+ * control stream for processing.
+ *
+ * This is mainly for secondary command buffers created with
+ * VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT flag. In that case we need to
+ * copy secondary control stream into the primary control stream for processing.
+ * This is done as part of vkCmdExecuteCommands.
+ *
+ * We create deferred control stream which is basically the same control stream
+ * but based in host side memory to avoid reserving device side resource.
+ *
+ * \param[in,out] csb_dst Destination control Stream Builder object.
+ * \param[in]     csb_src Source Control Stream Builder object.
+ */
+void pvr_csb_copy(struct pvr_csb *csb_dst, struct pvr_csb *csb_src)
+{
+   const uint8_t stream_link_space = (pvr_cmd_length(VDMCTRL_STREAM_LINK0) +
+                                      pvr_cmd_length(VDMCTRL_STREAM_LINK1)) *
+                                     sizeof(uint32_t);
+   const uint32_t size =
+      util_dynarray_num_elements(&csb_src->deferred_cs_mem, char);
+   const uint8_t *start = util_dynarray_begin(&csb_src->deferred_cs_mem);
+
+   /* Only deferred control stream supported as src. */
+   assert(csb_src->stream_type == PVR_CMD_STREAM_TYPE_GRAPHICS_DEFERRED);
+
+   /* Only graphics control stream supported as dst. */
+   assert(csb_dst->stream_type == PVR_CMD_STREAM_TYPE_GRAPHICS);
+
+   /* TODO: For now we don't support deferred streams bigger than one csb buffer
+    * object size.
+    *
+    * While adding support for this make sure to not break the words/dwords
+    * over two csb buffers.
+    */
+   pvr_finishme("Add support to copy streams bigger than one csb buffer");
+
+   assert(size < (PVR_CMD_BUFFER_CSB_BO_SIZE - stream_link_space));
+
+   memcpy(pvr_csb_alloc_dwords(csb_dst, size), start, size);
+}
+
 /**
  * \brief Adds VDMCTRL_STREAM_LINK/CDMCTRL_STREAM_LINK dwords into the control
  * stream pointed by csb object.

src/imagination/vulkan/pvr_csb.h

@@ -127,6 +127,7 @@ void pvr_csb_init(struct pvr_device *device,
                   struct pvr_csb *csb);
 void pvr_csb_finish(struct pvr_csb *csb);
 void *pvr_csb_alloc_dwords(struct pvr_csb *csb, uint32_t num_dwords);
+void pvr_csb_copy(struct pvr_csb *csb_dst, struct pvr_csb *csb_src);
 void pvr_csb_emit_link(struct pvr_csb *csb, pvr_dev_addr_t addr, bool ret);
 VkResult pvr_csb_emit_return(struct pvr_csb *csb);
 VkResult pvr_csb_emit_terminate(struct pvr_csb *csb);