Mesa (main): iris: SMEM buffers on discrete platforms are coherent

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Module: Mesa
Branch: main
Commit: c49041c9d7a923fc0306f5b0c313f62706dcb12a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c49041c9d7a923fc0306f5b0c313f62706dcb12a

Author: Jason Ekstrand <jason at jlekstrand.net>
Date:   Fri Jul 23 12:03:32 2021 -0500

iris: SMEM buffers on discrete platforms are coherent

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11888>

---

 src/gallium/drivers/iris/iris_bufmgr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/iris/iris_bufmgr.c b/src/gallium/drivers/iris/iris_bufmgr.c
index 9515c4bee32..f5f0ec0e9d3 100644
--- a/src/gallium/drivers/iris/iris_bufmgr.c
+++ b/src/gallium/drivers/iris/iris_bufmgr.c
@@ -613,7 +613,9 @@ iris_bo_alloc(struct iris_bufmgr *bufmgr,
    uint64_t bo_size =
       bucket ? bucket->size : MAX2(ALIGN(size, page_size), page_size);
 
-   bool is_coherent = bufmgr->has_llc || (flags & BO_ALLOC_COHERENT);
+   bool is_coherent = bufmgr->has_llc ||
+                      (bufmgr->vram.size > 0 && !local) ||
+                      (flags & BO_ALLOC_COHERENT);
    enum iris_mmap_mode mmap_mode =
       !local && is_coherent ? IRIS_MMAP_WB : IRIS_MMAP_WC;