Re: [PATCH] drm/amdgpu: Fix crash on device remove/driver unload

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Ah.. didn't notice that. As I mentioned, it's mainly a cosmetic/semantic thing. AFAIU, hw_fini() is expected to be called once when hw is removed/reset or driver is removed. Suspend is temporary and may be called multiple times during the lifetime. So calling hw_fini() from suspend() appears a bit odd (probably just for me).

If it's worth, something like this -

vce_4_2_suspend() {

__vce_4_2_suspend();
....
// Anything extra
}

vce_4_2_hw_fini() {

__vce_4_2_suspend();

}

Thanks,
Lijo

From: Grodzovsky, Andrey <Andrey.Grodzovsky@xxxxxxx>
Sent: Thursday, September 16, 2021 9:47:41 PM
To: Lazar, Lijo <Lijo.Lazar@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: Quan, Evan <Evan.Quan@xxxxxxx>; Pan, Xinhui <Xinhui.Pan@xxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>
Subject: Re: [PATCH] drm/amdgpu: Fix crash on device remove/driver unload
 

On 2021-09-16 11:51 a.m., Lazar, Lijo wrote:
>
>
> On 9/16/2021 9:15 PM, Andrey Grodzovsky wrote:
>>
>> On 2021-09-16 4:20 a.m., Lazar, Lijo wrote:
>>> A minor comment below.
>>>
>>> On 9/16/2021 1:11 AM, Andrey Grodzovsky wrote:
>>>> Crash:
>>>> BUG: unable to handle page fault for address: 00000000000010e1
>>>> RIP: 0010:vega10_power_gate_vce+0x26/0x50 [amdgpu]
>>>> Call Trace:
>>>> pp_set_powergating_by_smu+0x16a/0x2b0 [amdgpu]
>>>> amdgpu_dpm_set_powergating_by_smu+0x92/0xf0 [amdgpu]
>>>> amdgpu_dpm_enable_vce+0x2e/0xc0 [amdgpu]
>>>> vce_v4_0_hw_fini+0x95/0xa0 [amdgpu]
>>>> amdgpu_device_fini_hw+0x232/0x30d [amdgpu]
>>>> amdgpu_driver_unload_kms+0x5c/0x80 [amdgpu]
>>>> amdgpu_pci_remove+0x27/0x40 [amdgpu]
>>>> pci_device_remove+0x3e/0xb0
>>>> device_release_driver_internal+0x103/0x1d0
>>>> device_release_driver+0x12/0x20
>>>> pci_stop_bus_device+0x79/0xa0
>>>> pci_stop_and_remove_bus_device_locked+0x1b/0x30
>>>> remove_store+0x7b/0x90
>>>> dev_attr_store+0x17/0x30
>>>> sysfs_kf_write+0x4b/0x60
>>>> kernfs_fop_write_iter+0x151/0x1e0
>>>>
>>>> Why:
>>>> VCE/UVD had dependency on SMC block for their suspend but
>>>> SMC block is the first to do HW fini due to some constraints
>>>>
>>>> How:
>>>> Since the original patch was dealing with suspend issues
>>>> move the SMC block dependency back into suspend hooks as
>>>> was done in V1 of the original patches.
>>>> Keep flushing idle work both in suspend and HW fini seuqnces
>>>> since it's essential in both cases.
>>>>
>>>> Fixes:
>>>> 2178d3c189b9 drm/amdgpu: add missing cleanups for more ASICs on
>>>> UVD/VCE suspend
>>>> ee6679aaa61c drm/amdgpu: add missing cleanups for Polaris12 UVD/VCE
>>>> on suspend
>>>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
>>>> ---
>>>>   drivers/gpu/drm/amd/amdgpu/uvd_v3_1.c | 24 ++++++++-------
>>>>   drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c | 24 ++++++++-------
>>>>   drivers/gpu/drm/amd/amdgpu/uvd_v5_0.c | 24 ++++++++-------
>>>>   drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c | 32 ++++++++++---------
>>>>   drivers/gpu/drm/amd/amdgpu/vce_v2_0.c | 19 +++++++-----
>>>>   drivers/gpu/drm/amd/amdgpu/vce_v3_0.c | 28 +++++++++--------
>>>>   drivers/gpu/drm/amd/amdgpu/vce_v4_0.c | 44
>>>> ++++++++++++++-------------
>>>>   7 files changed, 105 insertions(+), 90 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/uvd_v3_1.c
>>>> b/drivers/gpu/drm/amd/amdgpu/uvd_v3_1.c
>>>> index 7232241e3bfb..0fef925b6602 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/uvd_v3_1.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/uvd_v3_1.c
>>>> @@ -698,6 +698,19 @@ static int uvd_v3_1_hw_fini(void *handle)
>>>>   {
>>>>       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>>   + cancel_delayed_work_sync(&adev->uvd.idle_work);
>>>> +
>>>> +    if (RREG32(mmUVD_STATUS) != 0)
>>>> +        uvd_v3_1_stop(adev);
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static int uvd_v3_1_suspend(void *handle)
>>>> +{
>>>> +    int r;
>>>> +    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> +
>>>>       /*
>>>>        * Proper cleanups before halting the HW engine:
>>>>        *   - cancel the delayed idle work
>>>> @@ -722,17 +735,6 @@ static int uvd_v3_1_hw_fini(void *handle)
>>>>                                  AMD_CG_STATE_GATE);
>>>>       }
>>>>   -    if (RREG32(mmUVD_STATUS) != 0)
>>>> -        uvd_v3_1_stop(adev);
>>>> -
>>>> -    return 0;
>>>> -}
>>>> -
>>>> -static int uvd_v3_1_suspend(void *handle)
>>>> -{
>>>> -    int r;
>>>> -    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> -
>>>>       r = uvd_v3_1_hw_fini(adev);
>>>
>>> "cosmetic change" comment - hw_fini is supposed to be the final tear
>>> down call. So instead of suspend calling hw_fini, perhaps it makes
>>> sense to read the other way - hw_fini just suspends the hardware?
>>>
>>> Thanks,
>>> Lijo
>>
>>
>> Not sure what you mean ?
>
> Now it is - suspend()-> calls hw_fini()
>
> What I meant is hw_fini() -> calls suspend() and that is read as "to
> do hw_fini() only suspend the hardware and nothing extra is needed".
>
> In short implementation stays in suspend() and hw_fini() calls suspend().


Sorry, still confused, what about amdgpu_vce_suspend being called from
vce_v4_0_suspend for example - we don't want that to be called from hw_fini.
Can you maybe show draft change of what you mean for one specific UVD or
VCE version ?

Andrey


>
> Thanks,
> Lijo
>
>>
>> Andrey
>>
>>
>>>
>>>>       if (r)
>>>>           return r;
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c
>>>> b/drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c
>>>> index 52d6de969f46..c108b8381795 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c
>>>> @@ -212,6 +212,19 @@ static int uvd_v4_2_hw_fini(void *handle)
>>>>   {
>>>>       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>>   + cancel_delayed_work_sync(&adev->uvd.idle_work);
>>>> +
>>>> +    if (RREG32(mmUVD_STATUS) != 0)
>>>> +        uvd_v4_2_stop(adev);
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static int uvd_v4_2_suspend(void *handle)
>>>> +{
>>>> +    int r;
>>>> +    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> +
>>>>       /*
>>>>        * Proper cleanups before halting the HW engine:
>>>>        *   - cancel the delayed idle work
>>>> @@ -236,17 +249,6 @@ static int uvd_v4_2_hw_fini(void *handle)
>>>>                                  AMD_CG_STATE_GATE);
>>>>       }
>>>>   -    if (RREG32(mmUVD_STATUS) != 0)
>>>> -        uvd_v4_2_stop(adev);
>>>> -
>>>> -    return 0;
>>>> -}
>>>> -
>>>> -static int uvd_v4_2_suspend(void *handle)
>>>> -{
>>>> -    int r;
>>>> -    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> -
>>>>       r = uvd_v4_2_hw_fini(adev);
>>>>       if (r)
>>>>           return r;
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/uvd_v5_0.c
>>>> b/drivers/gpu/drm/amd/amdgpu/uvd_v5_0.c
>>>> index db6d06758e4d..563493d1f830 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/uvd_v5_0.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/uvd_v5_0.c
>>>> @@ -210,6 +210,19 @@ static int uvd_v5_0_hw_fini(void *handle)
>>>>   {
>>>>       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>>   + cancel_delayed_work_sync(&adev->uvd.idle_work);
>>>> +
>>>> +    if (RREG32(mmUVD_STATUS) != 0)
>>>> +        uvd_v5_0_stop(adev);
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static int uvd_v5_0_suspend(void *handle)
>>>> +{
>>>> +    int r;
>>>> +    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> +
>>>>       /*
>>>>        * Proper cleanups before halting the HW engine:
>>>>        *   - cancel the delayed idle work
>>>> @@ -234,17 +247,6 @@ static int uvd_v5_0_hw_fini(void *handle)
>>>>                                  AMD_CG_STATE_GATE);
>>>>       }
>>>>   -    if (RREG32(mmUVD_STATUS) != 0)
>>>> -        uvd_v5_0_stop(adev);
>>>> -
>>>> -    return 0;
>>>> -}
>>>> -
>>>> -static int uvd_v5_0_suspend(void *handle)
>>>> -{
>>>> -    int r;
>>>> -    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> -
>>>>       r = uvd_v5_0_hw_fini(adev);
>>>>       if (r)
>>>>           return r;
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
>>>> b/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
>>>> index b6e82d75561f..1fd9ca21a091 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
>>>> @@ -606,6 +606,23 @@ static int uvd_v7_0_hw_fini(void *handle)
>>>>   {
>>>>       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>>   + cancel_delayed_work_sync(&adev->uvd.idle_work);
>>>> +
>>>> +    if (!amdgpu_sriov_vf(adev))
>>>> +        uvd_v7_0_stop(adev);
>>>> +    else {
>>>> +        /* full access mode, so don't touch any UVD register */
>>>> +        DRM_DEBUG("For SRIOV client, shouldn't do anything.\n");
>>>> +    }
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static int uvd_v7_0_suspend(void *handle)
>>>> +{
>>>> +    int r;
>>>> +    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> +
>>>>       /*
>>>>        * Proper cleanups before halting the HW engine:
>>>>        *   - cancel the delayed idle work
>>>> @@ -630,21 +647,6 @@ static int uvd_v7_0_hw_fini(void *handle)
>>>>                                  AMD_CG_STATE_GATE);
>>>>       }
>>>>   -    if (!amdgpu_sriov_vf(adev))
>>>> -        uvd_v7_0_stop(adev);
>>>> -    else {
>>>> -        /* full access mode, so don't touch any UVD register */
>>>> -        DRM_DEBUG("For SRIOV client, shouldn't do anything.\n");
>>>> -    }
>>>> -
>>>> -    return 0;
>>>> -}
>>>> -
>>>> -static int uvd_v7_0_suspend(void *handle)
>>>> -{
>>>> -    int r;
>>>> -    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> -
>>>>       r = uvd_v7_0_hw_fini(adev);
>>>>       if (r)
>>>>           return r;
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/vce_v2_0.c
>>>> b/drivers/gpu/drm/amd/amdgpu/vce_v2_0.c
>>>> index 84e488f189f5..67eb01fef789 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/vce_v2_0.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/vce_v2_0.c
>>>> @@ -481,6 +481,17 @@ static int vce_v2_0_hw_fini(void *handle)
>>>>   {
>>>>       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>>   + cancel_delayed_work_sync(&adev->vce.idle_work);
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static int vce_v2_0_suspend(void *handle)
>>>> +{
>>>> +    int r;
>>>> +    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> +
>>>> +
>>>>       /*
>>>>        * Proper cleanups before halting the HW engine:
>>>>        *   - cancel the delayed idle work
>>>> @@ -504,14 +515,6 @@ static int vce_v2_0_hw_fini(void *handle)
>>>>                                  AMD_CG_STATE_GATE);
>>>>       }
>>>>   -    return 0;
>>>> -}
>>>> -
>>>> -static int vce_v2_0_suspend(void *handle)
>>>> -{
>>>> -    int r;
>>>> -    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> -
>>>>       r = vce_v2_0_hw_fini(adev);
>>>>       if (r)
>>>>           return r;
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/vce_v3_0.c
>>>> b/drivers/gpu/drm/amd/amdgpu/vce_v3_0.c
>>>> index 2a18c1e089fd..142e291983b4 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/vce_v3_0.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/vce_v3_0.c
>>>> @@ -492,6 +492,21 @@ static int vce_v3_0_hw_fini(void *handle)
>>>>       int r;
>>>>       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>>   + cancel_delayed_work_sync(&adev->vce.idle_work);
>>>> +
>>>> +    r = vce_v3_0_wait_for_idle(handle);
>>>> +    if (r)
>>>> +        return r;
>>>> +
>>>> +    vce_v3_0_stop(adev);
>>>> +    return vce_v3_0_set_clockgating_state(adev, AMD_CG_STATE_GATE);
>>>> +}
>>>> +
>>>> +static int vce_v3_0_suspend(void *handle)
>>>> +{
>>>> +    int r;
>>>> +    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> +
>>>>       /*
>>>>        * Proper cleanups before halting the HW engine:
>>>>        *   - cancel the delayed idle work
>>>> @@ -515,19 +530,6 @@ static int vce_v3_0_hw_fini(void *handle)
>>>>                                  AMD_CG_STATE_GATE);
>>>>       }
>>>>   -    r = vce_v3_0_wait_for_idle(handle);
>>>> -    if (r)
>>>> -        return r;
>>>> -
>>>> -    vce_v3_0_stop(adev);
>>>> -    return vce_v3_0_set_clockgating_state(adev, AMD_CG_STATE_GATE);
>>>> -}
>>>> -
>>>> -static int vce_v3_0_suspend(void *handle)
>>>> -{
>>>> -    int r;
>>>> -    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>> -
>>>>       r = vce_v3_0_hw_fini(adev);
>>>>       if (r)
>>>>           return r;
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
>>>> b/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
>>>> index 044cf9d74b85..226b79254db8 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/vce_v4_0.c
>>>> @@ -544,29 +544,8 @@ static int vce_v4_0_hw_fini(void *handle)
>>>>   {
>>>>       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>>>>   -    /*
>>>> -     * Proper cleanups before halting the HW engine:
>>>> -     *   - cancel the delayed idle work
>>>> -     *   - enable powergating
>>>> -     *   - enable clockgating
>>>> -     *   - disable dpm
>>>> -     *
>>>> -     * TODO: to align with the VCN implementation, move the
>>>> -     * jobs for clockgating/powergating/dpm setting to
>>>> -     * ->set_powergating_state().
>>>> -     */
>>>>       cancel_delayed_work_sync(&adev->vce.idle_work);
>>>>   -    if (adev->pm.dpm_enabled) {
>>>> -        amdgpu_dpm_enable_vce(adev, false);
>>>> -    } else {
>>>> -        amdgpu_asic_set_vce_clocks(adev, 0, 0);
>>>> -        amdgpu_device_ip_set_powergating_state(adev,
>>>> AMD_IP_BLOCK_TYPE_VCE,
>>>> -                               AMD_PG_STATE_GATE);
>>>> -        amdgpu_device_ip_set_clockgating_state(adev,
>>>> AMD_IP_BLOCK_TYPE_VCE,
>>>> -                               AMD_CG_STATE_GATE);
>>>> -    }
>>>> -
>>>>       if (!amdgpu_sriov_vf(adev)) {
>>>>           /* vce_v4_0_wait_for_idle(handle); */
>>>>           vce_v4_0_stop(adev);
>>>> @@ -596,6 +575,29 @@ static int vce_v4_0_suspend(void *handle)
>>>>           drm_dev_exit(idx);
>>>>       }
>>>>   +    /*
>>>> +     * Proper cleanups before halting the HW engine:
>>>> +     *   - cancel the delayed idle work
>>>> +     *   - enable powergating
>>>> +     *   - enable clockgating
>>>> +     *   - disable dpm
>>>> +     *
>>>> +     * TODO: to align with the VCN implementation, move the
>>>> +     * jobs for clockgating/powergating/dpm setting to
>>>> +     * ->set_powergating_state().
>>>> +     */
>>>> +    cancel_delayed_work_sync(&adev->vce.idle_work);
>>>> +
>>>> +    if (adev->pm.dpm_enabled) {
>>>> +        amdgpu_dpm_enable_vce(adev, false);
>>>> +    } else {
>>>> +        amdgpu_asic_set_vce_clocks(adev, 0, 0);
>>>> +        amdgpu_device_ip_set_powergating_state(adev,
>>>> AMD_IP_BLOCK_TYPE_VCE,
>>>> +                               AMD_PG_STATE_GATE);
>>>> +        amdgpu_device_ip_set_clockgating_state(adev,
>>>> AMD_IP_BLOCK_TYPE_VCE,
>>>> +                               AMD_CG_STATE_GATE);
>>>> +    }
>>>> +
>>>>       r = vce_v4_0_hw_fini(adev);
>>>>       if (r)
>>>>           return r;
>>>>

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