Then we forgot the proposal I provided before.
I think the below seq may fixed the race condition issue that we
are facing.
1. stop scheduling new jobs
for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
if (adev->vcn.harvest_config & (1 << i))
continue;
ring = &adev->vcn.inst[i].ring_dec;
ring->sched.ready = false;
for (j = 0; j < adev->vcn.num_enc_rings; ++j) {
ring = &adev->vcn.inst[i].ring_enc[j];
ring->sched.ready = false;
}
}
2. cancel_delayed_work_sync(&adev->vcn.idle_work);
3. SOC15_WAIT_ON_RREG(VCN,
inst_idx, mmUVD_POWER_STATUS, 1,
UVD_POWER_STATUS__UVD_POWER_STATUS_MASK);
4. amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCN, AMD_PG_STATE_GATE);
5. saved_bo
Best Regards!
James
On 2021-05-17 12:54 p.m., James Zhu wrote:
I am wondering if there are still some jobs kept in the queue, it is lucky to check
Yes it's possible, in this case delayed handler is set, so cancelling once is enough.
UVD_POWER_STATUS done, but after, fw start a new job that list in the queue.
To handle this situation perfectly, we need add mechanism to suspend fw first.
I think that should be handled by the sequence from vcn_v3_0_stop_dpg_mode().
Another case, if it is unlucky, that vcn fw hung at that time, UVD_POWER_STATUS
always keeps busy. then it needs force powering gate the vcn hw after certain time waiting.
Yep, we still need to gate VCN power after certain timeout.
Regards,
Leo
Best Regards!
James
On 2021-05-17 12:34 p.m., Leo Liu wrote:
On 2021-05-17 11:52 a.m., James Zhu wrote:
During vcn suspends, stop ring continue to receive new requests,
and try to wait for all vcn jobs to finish gracefully.
v2: Forced powering gate vcn hardware after few wainting retry.
Signed-off-by: James Zhu <James.Zhu@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
index 2016459..9f3a6e7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
@@ -275,9 +275,29 @@ int amdgpu_vcn_suspend(struct amdgpu_device *adev)
{
unsigned size;
void *ptr;
+ int retry_max = 6;
int i;
- cancel_delayed_work_sync(&adev->vcn.idle_work);
+ for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
+ if (adev->vcn.harvest_config & (1 << i))
+ continue;
+ ring = &adev->vcn.inst[i].ring_dec;
+ ring->sched.ready = false;
+
+ for (j = 0; j < adev->vcn.num_enc_rings; ++j) {
+ ring = &adev->vcn.inst[i].ring_enc[j];
+ ring->sched.ready = false;
+ }
+ }
+
+ while (retry_max-- && cancel_delayed_work_sync(&adev->vcn.idle_work))
+ mdelay(5);
I think it's possible to have one pending job unprocessed with VCN when suspend sequence getting here, but it shouldn't be more than one, cancel_delayed_work_sync probably return false after the first time, so calling cancel_delayed_work_sync once should be enough here. we probably need to wait longer from:
SOC15_WAIT_ON_RREG(VCN, inst_idx, mmUVD_POWER_STATUS, 1,
UVD_POWER_STATUS__UVD_POWER_STATUS_MASK);
to make sure the unprocessed job get done.
Regards,
Leo
+ if (!retry_max && !amdgpu_sriov_vf(adev)) {
+ if (RREG32_SOC15(VCN, i, mmUVD_STATUS)) {
+ dev_warn(adev->dev, "Forced powering gate vcn hardware!");
+ vcn_v3_0_set_powergating_state(adev, AMD_PG_STATE_GATE);
+ }
+ }
for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
if (adev->vcn.harvest_config & (1 << i))
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