From d782a467ca19934e0c8185bf867f9bd5d4e6b85d Mon Sep 17 00:00:00 2001
From: Guchun Chen <guchun.chen@amd.com>
Date: Thu, 10 Feb 2022 14:34:51 +0800
Subject: drm/amdgpu: no rlcg legacy read in SRIOV case
Git-commit: 22b1df28c009aaf78e77b20a9cc8d8bf98e698c8
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
rlcg legacy read is not available in SRIOV configration.
Otherwise, gmc_v9_0_flush_gpu_tlb will always complain
timeout and finally breaks driver load.
v2: bypass read in amdgpu_virt_get_rlcg_reg_access_flag (from Victor)
Fixes: 97d1a3b967a3cb ("drm/amdgpu: switch to get_rlcg_reg_access_flag for gfx9")
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Victor Skvortsov <Victor.Skvortsov@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index e1288901beb6..6668d7fa89e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -836,7 +836,7 @@ static bool amdgpu_virt_get_rlcg_reg_access_flag(struct amdgpu_device *adev,
/* only in new version, AMDGPU_REGS_NO_KIQ and
* AMDGPU_REGS_RLC are enabled simultaneously */
} else if ((acc_flags & AMDGPU_REGS_RLC) &&
- !(acc_flags & AMDGPU_REGS_NO_KIQ)) {
+ !(acc_flags & AMDGPU_REGS_NO_KIQ) && write) {
*rlcg_flag = AMDGPU_RLCG_GC_WRITE_LEGACY;
ret = true;
}
@@ -940,7 +940,7 @@ void amdgpu_sriov_wreg(struct amdgpu_device *adev,
u32 rlcg_flag;
if (!amdgpu_sriov_runtime(adev) &&
- amdgpu_virt_get_rlcg_reg_access_flag(adev, acc_flags, hwip, true, &rlcg_flag)) {
+ amdgpu_virt_get_rlcg_reg_access_flag(adev, acc_flags, hwip, true, &rlcg_flag)) {
amdgpu_virt_rlcg_reg_rw(adev, offset, value, rlcg_flag);
return;
}
@@ -957,7 +957,7 @@ u32 amdgpu_sriov_rreg(struct amdgpu_device *adev,
u32 rlcg_flag;
if (!amdgpu_sriov_runtime(adev) &&
- amdgpu_virt_get_rlcg_reg_access_flag(adev, acc_flags, hwip, false, &rlcg_flag))
+ amdgpu_virt_get_rlcg_reg_access_flag(adev, acc_flags, hwip, false, &rlcg_flag))
return amdgpu_virt_rlcg_reg_rw(adev, offset, 0, rlcg_flag);
if (acc_flags & AMDGPU_REGS_NO_KIQ)
--
2.38.1