RE: [PATCH] drm/amd/amdgpu: Add rev_id workaround logic for SRIOV setup

["Liu, Monk" <Monk.Liu@xxxxxxx>]

[AMD Official Use Only - Internal Distribution Only]

Reviewed-by: Monk Liu <monk.liu@xxxxxxx>

_____________________________________
Monk Liu|GPU Virtualization Team |AMD


-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Bokun Zhang
Sent: Wednesday, October 28, 2020 6:02 AM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Zhang, Bokun <Bokun.Zhang@xxxxxxx>
Subject: [PATCH] drm/amd/amdgpu: Add rev_id workaround logic for SRIOV setup

- When we are under SRIOV setup, the rev_id cannot be read
  properly. Therefore, we will return default value for it

Change-Id: I188d8e1b77f97c2eb29ef01aaf9ff9ea396a51c2
Signed-off-by: Bokun Zhang <Bokun.Zhang@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c b/drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c
index e0048806afaa..04c152843601 100644
--- a/drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c
+++ b/drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c
@@ -53,8 +53,20 @@ static void nbio_v2_3_remap_hdp_registers(struct amdgpu_device *adev)

 static u32 nbio_v2_3_get_rev_id(struct amdgpu_device *adev)  {
-u32 tmp = RREG32_SOC15(NBIO, 0, mmRCC_DEV0_EPF0_STRAP0);
+u32 tmp;
+
+if (amdgpu_sriov_vf(adev)) {
+/* workaround on rev_id for sriov
+* guest vm gets 0xffffffff when reading RCC_DEV0_EPF0_STRAP0,
+* as a consequence, the rev_id and external_rev_id are wrong.
+*
+* workaround it by hardcoding the rev_id to 0,
+* (which is the default value)
+*/
+return 0;
+}

+tmp = RREG32_SOC15(NBIO, 0, mmRCC_DEV0_EPF0_STRAP0);
 tmp &= RCC_DEV0_EPF0_STRAP0__STRAP_ATI_REV_ID_DEV0_F0_MASK;
 tmp >>= RCC_DEV0_EPF0_STRAP0__STRAP_ATI_REV_ID_DEV0_F0__SHIFT;

--
2.25.1

_______________________________________________
amd-gfx mailing list
amd-gfx@xxxxxxxxxxxxxxxxxxxxx
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&amp;data=04%7C01%7Cmonk.liu%40amd.com%7C5ddf2de922c74ecf2b7008d87ac53dd3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637394334870430374%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=vPCdjXdjfuBEPAi1gcgF%2B8oGDQCQeZdSLzChC8k0DWU%3D&amp;reserved=0
_______________________________________________
amd-gfx mailing list
amd-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/amd-gfx