Fall back to MMIO to read registers as rlcg read is not
available for gfx v9 in SRIOV configration. Otherwise,
gmc_v9_0_flush_gpu_tlb will always complain timeout and
finally breaks driver load.
Fixes: 0dc4a7e75581("drm/amdgpu: switch to get_rlcg_reg_access_flag for gfx9")
Signed-off-by: Guchun Chen <guchun.chen@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index e1288901beb6..a3274fa1c7e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -37,6 +37,16 @@
vf2pf_info->ucode_info[ucode].version = ver; \
} while (0)
+static bool amdgpu_virt_is_rlcg_read_supported(struct amdgpu_device *adev)
+{
+ /* rlcg read is not support in SRIOV with gfx v9 */
+ if ((adev->ip_versions[MP0_HWIP][0] == IP_VERSION(9, 0, 0)) ||
+ (adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 1)))
+ return false;
+
+ return true;
+}
+
bool amdgpu_virt_mmio_blocked(struct amdgpu_device *adev)
{
/* By now all MMIO pages except mailbox are blocked */
@@ -957,7 +967,8 @@ 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_is_rlcg_read_supported(adev) &&
+ 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)
--
2.17.1
