RE: [PATCH] drm/amdgpu: When the VCN(1.0) block is suspended, powergating is explicitly enabled

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[AMD Official Use Only]

Hi Alex,

Per our checking, vcn_v2 and vcn_v3 already have the dpm disablement(below) in their ->suspend routine which should prevent them from the issue here.
	if (adev->pm.dpm_enabled)
		amdgpu_dpm_enable_uvd(adev, false);
So, maybe it's a different story with those newer APUs. Can you forward the bug reports to me?

Thanks,
Evan
> -----Original Message-----
> From: Alex Deucher <alexdeucher@xxxxxxxxx>
> Sent: Thursday, December 16, 2021 11:38 PM
> To: Quan, Evan <Evan.Quan@xxxxxxx>
> Cc: Zhu, James <James.Zhu@xxxxxxx>; Gong, Curry
> <Curry.Gong@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx; Deucher,
> Alexander <Alexander.Deucher@xxxxxxx>; Liu, Leo <Leo.Liu@xxxxxxx>
> Subject: Re: [PATCH] drm/amdgpu: When the VCN(1.0) block is suspended,
> powergating is explicitly enabled
> 
> FWIW, it looks like all versions of VCN need the same fix.  There have been
> reports of suspend failing when VCN is in use on other newer APUs as well.
> 
> Alex
> 
> On Tue, Dec 14, 2021 at 12:59 AM Quan, Evan <Evan.Quan@xxxxxxx> wrote:
> >
> > [AMD Official Use Only]
> >
> >
> >
> >
> >
> >
> >
> > From: Zhu, James <James.Zhu@xxxxxxx>
> > Sent: Monday, December 13, 2021 9:39 PM
> > To: Gong, Curry <Curry.Gong@xxxxxxx>; Zhu, James
> <James.Zhu@xxxxxxx>;
> > amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> > Cc: Liu, Leo <Leo.Liu@xxxxxxx>; Quan, Evan <Evan.Quan@xxxxxxx>;
> > Deucher, Alexander <Alexander.Deucher@xxxxxxx>
> > Subject: Re: [PATCH] drm/amdgpu: When the VCN(1.0) block is suspended,
> > powergating is explicitly enabled
> >
> >
> >
> > Hi Curry, Evan,
> >
> > It seems vcn1.0 power gate sequence are special.
> >
> > if the original solution is thread safe, then the following solution will be
> thread safe also.
> >
> > static int vcn_v1_0_hw_fini(void *handle) {
> >     struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> >
> >     cancel_delayed_work_sync(&adev->vcn.idle_work);
> >
> >     if ((adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) ||
> >         (adev->vcn.cur_state != AMD_PG_STATE_GATE &&
> >          RREG32_SOC15(VCN, 0, mmUVD_STATUS))) {
> > +        if (adev->pm.dpm_enabled)
> > +            amdgpu_dpm_enable_uvd(adev, false);
> > +        else
> > +            vcn_v1_0_set_powergating_state(adev, AMD_PG_STATE_GATE);
> >
> > [Quan, Evan] Considering adev->pm.dpm_enabled is always true,
> “vcn_v1_0_set_powergating_state(adev, AMD_PG_STATE_GATE); “ will
> become dead code.
> >
> > Also, the vcn_v1_0_hw_fini is also used in other scenarios(except the
> suspend/resume discussed here). So, it seems quite risky compared with
> Curry’s original patch.
> >
> > Before we can come up with a better idea, I would suggest to land Curry’s
> original patch as a quick fix.
> >
> >
> >
> > BR
> >
> > Evan
> >
> >
> >     }
> >
> > Best Regards!
> >
> > James
> >
> > On 2021-12-13 3:55 a.m., Gong, Curry wrote:
> >
> > [AMD Official Use Only]
> >
> >
> >
> > Hi James:
> >
> >
> >
> > With the following patch, an error will be reported when the driver is
> > loaded
> >
> > +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
> >
> > @@ -1202,6 +1204,9 @@ static int vcn_v1_0_stop(struct amdgpu_device
> > *adev)
> >
> >         else
> >
> >                 r = vcn_v1_0_stop_spg_mode(adev);
> >
> >
> >
> > c
> >
> >         return r;
> >
> > }
> >
> >
> >
> >
> >
> > $ dmesg
> >
> > [  363.181081] INFO: task kworker/3:2:223 blocked for more than 120
> seconds.
> >
> > [  363.181150]       Tainted: G           OE     5.11.0-41-generic #45~20.04.1-
> Ubuntu
> >
> > [  363.181208] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> >
> > [  363.181266] task:kworker/3:2     state:D stack:    0 pid:  223 ppid:     2
> flags:0x00004000
> >
> > [  363.181276] Workqueue: events vcn_v1_0_idle_work_handler [amdgpu]
> >
> > [  363.181612] Call Trace:
> >
> > [  363.181618]  __schedule+0x44c/0x8a0
> >
> > [  363.181627]  schedule+0x4f/0xc0
> >
> > [  363.181631]  schedule_preempt_disabled+0xe/0x10
> >
> > [  363.181636]  __mutex_lock.isra.0+0x183/0x4d0
> >
> > [  363.181643]  __mutex_lock_slowpath+0x13/0x20
> >
> > [  363.181648]  mutex_lock+0x32/0x40
> >
> > [  363.181652]  amdgpu_dpm_set_powergating_by_smu+0x9c/0x180
> [amdgpu]
> >
> > [  363.182055]  amdgpu_dpm_enable_uvd+0x38/0x110 [amdgpu]
> >
> > [  363.182454]  vcn_v1_0_set_powergating_state+0x2e7e/0x3cf0 [amdgpu]
> >
> > [  363.182776]  amdgpu_device_ip_set_powergating_state+0x6c/0xc0
> > [amdgpu]
> >
> > [  363.183028]  smu10_powergate_vcn+0x2a/0x80 [amdgpu]
> >
> > [  363.183361]  pp_set_powergating_by_smu+0xc5/0x2b0 [amdgpu]
> >
> > [  363.183699]  amdgpu_dpm_set_powergating_by_smu+0xb6/0x180
> [amdgpu]
> >
> > [  363.184040]  amdgpu_dpm_enable_uvd+0x38/0x110 [amdgpu]
> >
> > [  363.184391]  vcn_v1_0_idle_work_handler+0xe1/0x130 [amdgpu]
> >
> > [  363.184667]  process_one_work+0x220/0x3c0
> >
> > [  363.184674]  worker_thread+0x4d/0x3f0
> >
> > [  363.184677]  ? process_one_work+0x3c0/0x3c0
> >
> > [  363.184680]  kthread+0x12b/0x150
> >
> > [  363.184685]  ? set_kthread_struct+0x40/0x40
> >
> > [  363.184690]  ret_from_fork+0x22/0x30
> >
> > [  363.184699] INFO: task kworker/2:2:233 blocked for more than 120
> seconds.
> >
> > [  363.184739]       Tainted: G           OE     5.11.0-41-generic #45~20.04.1-
> Ubuntu
> >
> > [  363.184782] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> >
> > [  363.184825] task:kworker/2:2     state:D stack:    0 pid:  233 ppid:     2
> flags:0x00004000
> >
> > [  363.184831] Workqueue: events
> > amdgpu_device_delayed_init_work_handler [amdgpu]
> >
> > [  363.185085] Call Trace:
> >
> > [  363.185087]  __schedule+0x44c/0x8a0
> >
> > [  363.185092]  schedule+0x4f/0xc0
> >
> > [  363.185095]  schedule_timeout+0x202/0x290
> >
> > [  363.185099]  ? sched_clock_cpu+0x11/0xb0
> >
> > [  363.185105]  wait_for_completion+0x94/0x100
> >
> > [  363.185110]  __flush_work+0x12a/0x1e0
> >
> > [  363.185113]  ? worker_detach_from_pool+0xc0/0xc0
> >
> > [  363.185119]  __cancel_work_timer+0x10e/0x190
> >
> > [  363.185123]  cancel_delayed_work_sync+0x13/0x20
> >
> > [  363.185126]  vcn_v1_0_ring_begin_use+0x20/0x70 [amdgpu]
> >
> > [  363.185401]  amdgpu_ring_alloc+0x48/0x60 [amdgpu]
> >
> > [  363.185640]  amdgpu_ib_schedule+0x493/0x600 [amdgpu]
> >
> > [  363.185884]  amdgpu_job_submit_direct+0x3c/0xd0 [amdgpu]
> >
> > [  363.186186]  amdgpu_vcn_dec_send_msg+0x105/0x210 [amdgpu]
> >
> > [  363.186460]  amdgpu_vcn_dec_ring_test_ib+0x69/0x110 [amdgpu]
> >
> > [  363.186734]  amdgpu_ib_ring_tests+0xf5/0x160 [amdgpu]
> >
> > [  363.186978]  amdgpu_device_delayed_init_work_handler+0x15/0x30
> > [amdgpu]
> >
> > [  363.187206]  process_one_work+0x220/0x3c0
> >
> > [  363.187210]  worker_thread+0x4d/0x3f0
> >
> > [  363.187214]  ? process_one_work+0x3c0/0x3c0
> >
> > [  363.187217]  kthread+0x12b/0x150
> >
> > [  363.187221]  ? set_kthread_struct+0x40/0x40
> >
> > [  363.187226]  ret_from_fork+0x22/0x30
> >
> >
> >
> >
> >
> > BR
> >
> > Curry Gong
> >
> > From: Zhu, James <James.Zhu@xxxxxxx>
> > Sent: Saturday, December 11, 2021 5:07 AM
> > To: Gong, Curry <Curry.Gong@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> > Cc: Liu, Leo <Leo.Liu@xxxxxxx>; Zhu, James <James.Zhu@xxxxxxx>;
> Quan,
> > Evan <Evan.Quan@xxxxxxx>; Deucher, Alexander
> > <Alexander.Deucher@xxxxxxx>
> > Subject: Re: [PATCH] drm/amdgpu: When the VCN(1.0) block is suspended,
> > powergating is explicitly enabled
> >
> >
> >
> > On 2021-12-10 6:41 a.m., chen gong wrote:
> >
> > Play a video on the raven (or PCO, raven2) platform, and then do the
> > S3
> >
> > test. When resume, the following error will be reported:
> >
> >
> >
> > amdgpu 0000:02:00.0: [drm:amdgpu_ring_test_helper [amdgpu]] *ERROR*
> > ring
> >
> > vcn_dec test failed (-110)
> >
> > [drm:amdgpu_device_ip_resume_phase2 [amdgpu]] *ERROR* resume of
> IP
> > block
> >
> > <vcn_v1_0> failed -110
> >
> > amdgpu 0000:02:00.0: amdgpu: amdgpu_device_ip_resume failed (-110).
> >
> > PM: dpm_run_callback(): pci_pm_resume+0x0/0x90 returns -110
> >
> >
> >
> > [why]
> >
> > When playing the video: The power state flag of the vcn block is set
> > to
> >
> > POWER_STATE_ON.
> >
> >
> >
> > When doing suspend: There is no change to the power state flag of the
> >
> > vcn block, it is still POWER_STATE_ON.
> >
> >
> >
> > When doing resume: Need to open the power gate of the vcn block and
> > set
> >
> > the power state flag of the VCN block to POWER_STATE_ON.
> >
> > But at this time, the power state flag of the vcn block is already
> >
> > POWER_STATE_ON. The power status flag check in the "8f2cdef
> drm/amd/pm:
> >
> > avoid duplicate powergate/ungate setting" patch will return the
> >
> > amdgpu_dpm_set_powergating_by_smu function directly.
> >
> > As a result, the gate of the power was not opened, causing the
> >
> > subsequent ring test to fail.
> >
> >
> >
> > [how]
> >
> > In the suspend function of the vcn block, explicitly change the power
> >
> > state flag of the vcn block to POWER_STATE_OFF.
> >
> >
> >
> > Signed-off-by: chen gong <curry.gong@xxxxxxx>
> >
> > ---
> >
> >  drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c | 7 +++++++
> >
> >  1 file changed, 7 insertions(+)
> >
> >
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
> > b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
> >
> > index d54d720..d73676b 100644
> >
> > --- a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
> >
> > +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
> >
> > @@ -246,6 +246,13 @@ static int vcn_v1_0_suspend(void *handle)
> >
> >  {
> >
> >   int r;
> >
> >   struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> >
> > + bool cancel_success;
> >
> > +
> >
> > + cancel_success = cancel_delayed_work_sync(&adev->vcn.idle_work);
> >
> > [JZ] Can you refer to vcn_v3_0_stop , and add
> amdgpu_dpm_enable_uvd(adev, false); to the end of vcn_v1_0_stop?
> >
> > See if it also can help.
> >
> >
> >
> > + if (cancel_success) {
> >
> > +        if (adev->pm.dpm_enabled)
> >
> > +                amdgpu_dpm_enable_uvd(adev, false);
> >
> > + }
> >
> >
> >
> >   r = vcn_v1_0_hw_fini(adev);
> >
> >   if (r)




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