[PATCH] drm/amdkfd: Remove the requirement for atomic Ops on vg20

Deucher, Alexander Alexander.Deucher at amd.com
Wed Sep 26 16:46:24 UTC 2018

Acked-by: Alex Deucher <alexander.deucher at amd.com>

From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Kent Russell <kent.russell at amd.com>
Sent: Wednesday, September 26, 2018 9:41:52 AM
To: amd-gfx at lists.freedesktop.org
Cc: Russell, Kent; Liu, Shaoyun
Subject: [PATCH] drm/amdkfd: Remove the requirement for atomic Ops on vg20

From: Shaoyun Liu <Shaoyun.Liu at amd.com>

Firmware have the workaround to replace the atomic Ops with read-modify-write on CP side.
User should not expect atomic Ops on system memory works normally if system didn't not
support it.

Change-Id: I89395b099fe0931b9b3627651b512dde3149fadd
Signed-off-by: Shaoyun Liu <Shaoyun.Liu at amd.com>
Signed-off-by: Kent Russell <kent.russell at amd.com>
 drivers/gpu/drm/amd/amdkfd/kfd_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index b0c2afb..b505bf3 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -263,7 +263,7 @@ static const struct kfd_device_info vega20_device_info = {
         .mqd_size_aligned = MQD_SIZE_ALIGNED,
         .supports_cwsr = true,
         .needs_iommu_device = false,
-       .needs_pci_atomics = true,
+       .needs_pci_atomics = false,
         .num_sdma_engines = 2,
         .num_sdma_queues_per_engine = 8,

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