Mesa (master): iris: implement gen12 post sync pipe control workaround

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Module: Mesa
Branch: master
Commit: 19e7bcee1742a40981a0b1c06447bca22646c294
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=19e7bcee1742a40981a0b1c06447bca22646c294

Author: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Date:   Wed Jan 15 14:06:07 2020 +0200

iris: implement gen12 post sync pipe control workaround

Like Skylake, Gen12 requires a workaround for PIPE_CONTROLs using a
post-sync operation.

v2: Restrict to A0

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3405>

---

 src/gallium/drivers/iris/iris_state.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/iris/iris_state.c b/src/gallium/drivers/iris/iris_state.c
index 7222e724ac6..db4568c7777 100644
--- a/src/gallium/drivers/iris/iris_state.c
+++ b/src/gallium/drivers/iris/iris_state.c
@@ -6864,7 +6864,8 @@ iris_emit_raw_pipe_control(struct iris_batch *batch,
                                  imm);
    }
 
-   if (GEN_GEN == 9 && IS_COMPUTE_PIPELINE(batch) && post_sync_flags) {
+   if ((GEN_GEN == 9 || (GEN_GEN == 12 && devinfo->revision == 0 /* A0*/)) &&
+        IS_COMPUTE_PIPELINE(batch) && post_sync_flags) {
       /* Project: SKL / Argument: LRI Post Sync Operation [23]
        *
        * "PIPECONTROL command with “Command Streamer Stall Enable” must be
@@ -6873,6 +6874,8 @@ iris_emit_raw_pipe_control(struct iris_batch *batch,
        *  PIPELINE_SELECT command is set to GPGPU mode of operation)."
        *
        * The same text exists a few rows below for Post Sync Op.
+       *
+       * On Gen12 this is GEN:BUG:1607156449.
        */
       iris_emit_raw_pipe_control(batch,
                                  "workaround: CS stall before gpgpu post-sync",