From: Marek Olšák <marek.ol...@amd.com>
This improves performance for certain games.
Cc: 18.1 <mesa-sta...@lists.freedesktop.org>
---
src/gallium/drivers/radeonsi/si_buffer.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/gallium/drivers/radeonsi/si_buffer.c
b/src/gallium/drivers/radeonsi/si_buffer.c
index 2d68edc3404..0546fa9d336 100644
--- a/src/gallium/drivers/radeonsi/si_buffer.c
+++ b/src/gallium/drivers/radeonsi/si_buffer.c
@@ -144,22 +144,26 @@ void si_init_resource_fields(struct si_screen *sscreen,
if (res->b.b.target == PIPE_BUFFER &&
res->b.b.flags & (PIPE_RESOURCE_FLAG_MAP_PERSISTENT |
PIPE_RESOURCE_FLAG_MAP_COHERENT)) {
/* Use GTT for all persistent mappings with older
* kernels, because they didn't always flush the HDP
* cache before CS execution.
*
* Write-combined CPU mappings are fine, the kernel
* ensures all CPU writes finish before the GPU
* executes a command stream.
+ *
+ * radeon doesn't have good BO move throttling, so put all
+ * persistent buffers into GTT to prevent VRAM CPU page faults.
*/
- if (!sscreen->info.kernel_flushes_hdp_before_ib)
+ if (!sscreen->info.kernel_flushes_hdp_before_ib ||
+ sscreen->info.drm_major == 2)
res->domains = RADEON_DOMAIN_GTT;
}
/* Tiled textures are unmappable. Always put them in VRAM. */
if ((res->b.b.target != PIPE_BUFFER && !rtex->surface.is_linear) ||
res->b.b.flags & SI_RESOURCE_FLAG_UNMAPPABLE) {
res->domains = RADEON_DOMAIN_VRAM;
res->flags |= RADEON_FLAG_NO_CPU_ACCESS |
RADEON_FLAG_GTT_WC;
}
--
2.17.1
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