[PATCH] drm/amdgpu: set sw state to gfxoff after SR-IOV reset

[Horace Chen]

[Why]
Current SR-IOV will not set GC to off state, while it is a real
GC hard reset. Whthout GFX off flag, driver may do gfxhub invalidation
before firmware load and gfxhub gart enable. This operation may cause
CP to become busy because GC is not in the right state for invalidation.

[How]
Add a function for SR-IOV to clean up some sw state before recover. Set
adev->gfx.is_poweron to false to prevent gfxhub invalidation before gfx
firmware autoload complete.

Signed-off-by: Horace Chen <horace.chen at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |  3 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c   | 10 ++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h   |  1 +
 3 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 28e6419023b7..1c786190a84e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4575,6 +4575,9 @@ static int amdgpu_device_reset_sriov(struct amdgpu_device *adev,
 	if (r)
 		return r;
 
+	/* some sw clean up VF needs to do before recover */
+	amdgpu_virt_post_reset(adev);
+
 	/* Resume IP prior to SMC */
 	r = amdgpu_device_ip_reinit_early_sriov(adev);
 	if (r)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index 770eb9725ec1..c712d027d62d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -835,6 +835,16 @@ enum amdgpu_sriov_vf_mode amdgpu_virt_get_sriov_vf_mode(struct amdgpu_device *ad
 	return mode;
 }
 
+void amdgpu_virt_post_reset(struct amdgpu_device *adev)
+{
+	if (adev->ip_versions[GC_HWIP][0] == IP_VERSION(11, 0, 3)) {
+		/* force set to GFXOFF state after reset,
+		 * to avoid some invalid operation before GC enable
+		 */
+		adev->gfx.is_poweron = false;
+	}
+}
+
 bool amdgpu_virt_fw_load_skip_check(struct amdgpu_device *adev, uint32_t ucode_id)
 {
 	switch (adev->ip_versions[MP0_HWIP][0]) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
index d1f7509a44cb..fabb83e9d9ae 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
@@ -360,4 +360,5 @@ u32 amdgpu_sriov_rreg(struct amdgpu_device *adev,
 		      u32 offset, u32 acc_flags, u32 hwip, u32 xcc_id);
 bool amdgpu_virt_fw_load_skip_check(struct amdgpu_device *adev,
 			uint32_t ucode_id);
+void amdgpu_virt_post_reset(struct amdgpu_device *adev);
 #endif
-- 
2.34.1