0001-radeonsi-On-Aarch64-force-persistent-buffers-to-GTT.patch

From d72aa8ae74ffb7329003f9f23ffa05833af951ab Mon Sep 17 00:00:00 2001
From: Jon Nettleton <jon@solid-run.com>
Date: Fri, 14 Aug 2020 13:36:08 +0200
Subject: [PATCH] radeonsi: On Aarch64 force persistent buffers to GTT

This fixes a glamore corruption issue on the HoneyComb and by
internet reports should also fix problems seen on Huaweii
Kunpeng hardware.

The root cause of the corruption needs to be worked out, but
this patch also adds a noticable performance improvement. The
aquarium webgl demo under chromium increases from 39-49 FPS
when 5000 fish being rendered is selected.  Glmark scores also
improve by ~200 with no specific tests showing any regression.

Signed-off-by: Jon Nettleton <jon@solid-run.com>
---
 src/gallium/drivers/radeonsi/si_buffer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_buffer.c b/src/gallium/drivers/radeonsi/si_buffer.c
index 6b58aebee2d..c9e983367a0 100644
--- a/src/gallium/drivers/radeonsi/si_buffer.c
+++ b/src/gallium/drivers/radeonsi/si_buffer.c
@@ -100,6 +100,11 @@ void si_init_resource_fields(struct si_screen *sscreen, struct si_resource *res,
        */
       if (!sscreen->info.kernel_flushes_hdp_before_ib || !sscreen->info.is_amdgpu)
          res->domains = RADEON_DOMAIN_GTT;
+
+#if defined(PIPE_ARCH_AARCH64)
+      if (size <= 1024 * 1024)
+         res->domains = RADEON_DOMAIN_GTT;
+#endif
    }
 
    /* Tiled textures are unmappable. Always put them in VRAM. */
-- 
2.26.2