Mesa (main): zink: add a read barrier for indirect dispatch

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Module: Mesa
Branch: main
Commit: a2789fde0c7a8aa5436560692633838079e2e848
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a2789fde0c7a8aa5436560692633838079e2e848

Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date:   Fri Oct 15 11:57:14 2021 -0400

zink: add a read barrier for indirect dispatch

using the draw stage here doesn't make much sense, but that's what the
spec says, so let's git er done

fixes dEQP-GL45.functional.compute.indirect_dispatch* on radv

Cc: mesa-stable

Reviewed-by: Dave Airlie <airlied at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13381>

---

 src/gallium/drivers/zink/zink_draw.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/gallium/drivers/zink/zink_draw.cpp b/src/gallium/drivers/zink/zink_draw.cpp
index 85088770390..0a38c339ab2 100644
--- a/src/gallium/drivers/zink/zink_draw.cpp
+++ b/src/gallium/drivers/zink/zink_draw.cpp
@@ -896,6 +896,14 @@ zink_launch_grid(struct pipe_context *pctx, const struct pipe_grid_info *info)
    batch->work_count++;
    zink_batch_no_rp(ctx);
    if (info->indirect) {
+      /*
+         VK_ACCESS_INDIRECT_COMMAND_READ_BIT specifies read access to indirect command data read as
+         part of an indirect build, trace, drawing or dispatching command. Such access occurs in the
+         VK_PIPELINE_STAGE_DRAW_INDIRECT_BIT pipeline stage.
+
+         - Chapter 7. Synchronization and Cache Control
+       */
+      check_buffer_barrier(ctx, info->indirect, VK_ACCESS_INDIRECT_COMMAND_READ_BIT, VK_PIPELINE_STAGE_DRAW_INDIRECT_BIT);
       VKCTX(CmdDispatchIndirect)(batch->state->cmdbuf, zink_resource(info->indirect)->obj->buffer, info->indirect_offset);
       zink_batch_reference_resource_rw(batch, zink_resource(info->indirect), false);
    } else