Re: 回复: [PATCH] drm/amd/amdgpu: disable GFXOFF around debugfs access to MMIO
Deucher, Alexander
Alexander.Deucher at amd.com
Fri Feb 21 15:56:32 UTC 2020
[AMD Public Use]
Not at the moment. But we could add a debugfs file which just wraps amdgpu_gfx_off_ctrl(). That said, maybe we just add a delay here or a use a timer to delay turning gfxoff back on again so that we aren't turning it on and off so rapidly.
Alex
________________________________
From: Christian König <ckoenig.leichtzumerken at gmail.com>
Sent: Friday, February 21, 2020 10:43 AM
To: Deucher, Alexander <Alexander.Deucher at amd.com>; Huang, Ray <Ray.Huang at amd.com>; Liu, Monk <Monk.Liu at amd.com>
Cc: StDenis, Tom <Tom.StDenis at amd.com>; Alex Deucher <alexdeucher at gmail.com>; amd-gfx list <amd-gfx at lists.freedesktop.org>
Subject: Re: 回复: [PATCH] drm/amd/amdgpu: disable GFXOFF around debugfs access to MMIO
Do we have a way to disable GFXOFF on the fly?
If not maybe it would be a good idea to add a separate debugfs file to do this.
Christian.
Am 21.02.20 um 16:39 schrieb Deucher, Alexander:
[AMD Public Use]
If we are trying to debug a reproducible hang, probably best to just to disable gfxoff before messing with it to remove that as a factor. Otherwise, the method included in this patch is the proper way to disable/enable GFXOFF dynamically.
Alex
________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org><mailto:amd-gfx-bounces at lists.freedesktop.org> on behalf of Christian König <ckoenig.leichtzumerken at gmail.com><mailto:ckoenig.leichtzumerken at gmail.com>
Sent: Friday, February 21, 2020 10:27 AM
To: Huang, Ray <Ray.Huang at amd.com><mailto:Ray.Huang at amd.com>; Liu, Monk <Monk.Liu at amd.com><mailto:Monk.Liu at amd.com>
Cc: StDenis, Tom <Tom.StDenis at amd.com><mailto:Tom.StDenis at amd.com>; Alex Deucher <alexdeucher at gmail.com><mailto:alexdeucher at gmail.com>; amd-gfx list <amd-gfx at lists.freedesktop.org><mailto:amd-gfx at lists.freedesktop.org>
Subject: Re: 回复: [PATCH] drm/amd/amdgpu: disable GFXOFF around debugfs access to MMIO
Am 21.02.20 um 16:23 schrieb Huang Rui:
> On Fri, Feb 21, 2020 at 11:18:07PM +0800, Liu, Monk wrote:
>> Better not use KIQ, because when you use debugfs to read register you usually hit a hang, and by that case KIQ probably already die
> If CP is busy, the gfx should be in "on" state at that time, we needn't use KIQ.
Yeah, but how do you detect that? Do we have a way to wake up the CP
without asking power management to do so?
Cause the register debug interface is meant to be used when the ASIC is
completed locked up. Sending messages to the SMU is not really going to
work in that situation.
Regards,
Christian.
>
> Thanks,
> Ray
>
>> -----邮件原件-----
>> 发件人: amd-gfx <amd-gfx-bounces at lists.freedesktop.org><mailto:amd-gfx-bounces at lists.freedesktop.org> 代表 Huang Rui
>> 发送时间: 2020年2月21日 22:34
>> 收件人: StDenis, Tom <Tom.StDenis at amd.com><mailto:Tom.StDenis at amd.com>
>> 抄送: Alex Deucher <alexdeucher at gmail.com><mailto:alexdeucher at gmail.com>; amd-gfx list <amd-gfx at lists.freedesktop.org><mailto:amd-gfx at lists.freedesktop.org>
>> 主题: Re: [PATCH] drm/amd/amdgpu: disable GFXOFF around debugfs access to MMIO
>>
>> On Wed, Feb 19, 2020 at 10:09:46AM -0500, Tom St Denis wrote:
>>> I got some messages after a while:
>>>
>>> [ 741.788564] Failed to send Message 8.
>>> [ 746.671509] Failed to send Message 8.
>>> [ 748.749673] Failed to send Message 2b.
>>> [ 759.245414] Failed to send Message 7.
>>> [ 763.216902] Failed to send Message 2a.
>>>
>>> Are there any additional locks that should be held? Because some
>>> commands like --top or --waves can do a lot of distinct read
>>> operations (causing a lot of enable/disable calls).
>>>
>>> I'm going to sit on this a bit since I don't think the patch is ready
>>> for pushing out.
>>>
>> How about use RREG32_KIQ and WREG32_KIQ?
>>
>> Thanks,
>> Ray
>>
>>> Tom
>>>
>>> On 2020-02-19 10:07 a.m., Alex Deucher wrote:
>>>> On Wed, Feb 19, 2020 at 10:04 AM Tom St Denis <tom.stdenis at amd.com><mailto:tom.stdenis at amd.com> wrote:
>>>>> Signed-off-by: Tom St Denis <tom.stdenis at amd.com><mailto:tom.stdenis at amd.com>
>>>> Please add a patch description. With that fixed:
>>>> Reviewed-by: Alex Deucher <alexander.deucher at amd.com><mailto:alexander.deucher at amd.com>
>>>>
>>>>> ---
>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 3 +++
>>>>> 1 file changed, 3 insertions(+)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>>>>> index 7379910790c9..66f763300c96 100644
>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>>>>> @@ -169,6 +169,7 @@ static int amdgpu_debugfs_process_reg_op(bool read, struct file *f,
>>>>> if (pm_pg_lock)
>>>>> mutex_lock(&adev->pm.mutex);
>>>>>
>>>>> + amdgpu_gfx_off_ctrl(adev, false);
>>>>> while (size) {
>>>>> uint32_t value;
>>>>>
>>>>> @@ -192,6 +193,8 @@ static int amdgpu_debugfs_process_reg_op(bool read, struct file *f,
>>>>> }
>>>>>
>>>>> end:
>>>>> + amdgpu_gfx_off_ctrl(adev, true);
>>>>> +
>>>>> if (use_bank) {
>>>>> amdgpu_gfx_select_se_sh(adev, 0xffffffff, 0xffffffff, 0xffffffff);
>>>>> mutex_unlock(&adev->grbm_idx_mutex);
>>>>> --
>>>>> 2.24.1
>>>>>
>>>>> _______________________________________________
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