>>>RREG32_KIQ and WREG32_KIQ
If you are using RREG32_KIQ it is always go through KIQ no matter GFX is "on" state or not
-----邮件原件-----
发件人: Huang, Ray <Ray.Huang@xxxxxxx>
发送时间: 2020年2月21日 23:23
收件人: Liu, Monk <Monk.Liu@xxxxxxx>
抄送: StDenis, Tom <Tom.StDenis@xxxxxxx>; Alex Deucher <alexdeucher@xxxxxxxxx>; amd-gfx list <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
主题: Re: 回复: [PATCH] drm/amd/amdgpu: disable GFXOFF around debugfs access to MMIO
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.
Thanks,
Ray
>
> -----邮件原件-----
> 发件人: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> 代表 Huang Rui
> 发送时间: 2020年2月21日 22:34
> 收件人: StDenis, Tom <Tom.StDenis@xxxxxxx>
> 抄送: Alex Deucher <alexdeucher@xxxxxxxxx>; amd-gfx list
> <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
> 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@xxxxxxx> wrote:
> > > > Signed-off-by: Tom St Denis <tom.stdenis@xxxxxxx>
> > > Please add a patch description. With that fixed:
> > > Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
> > >
> > > > ---
> > > > 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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