linux-kernel - Re: [PATCH] modified: gpu/drm/panfrost/panfrost

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Message-ID: <20210611183646.0000770f@163.com>
Date:   Fri, 11 Jun 2021 18:36:46 +0800
From:   Chunyou Tang <tangchunyou@....com>
To:     Steven Price <steven.price@....com>
Cc:     tangchunyou <tangchunyou@....icubecorp.cn>,
        tomeu.vizoso@...labora.com, airlied@...ux.ie,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        alyssa.rosenzweig@...labora.com, tangchunyou@...becorp.cn
Subject: Re: [PATCH] modified: gpu/drm/panfrost/panfrost_gpu.c

于 Fri, 11 Jun 2021 11:10:16 +0100
Steven Price <steven.price@....com> 写道:

> On 10/06/2021 14:06, Chunyou Tang wrote:
> > Hi Steven,
> 
> Hi Chunyou,
> 
> For some reason I'm not directly receiving your emails (only via the
> list) - can you double check your email configuration?
> 
> >>> The GPU exception fault status register(0x3C),the low 8 bit is the
> >>> EXCEPTION_TYPE.We can see the description at P3-78 in spec.
> > 
> > 	You can see the spec
> > 	<arm_heimdall_technical_reference_manual_100612_0001_00_en.pdf>.
> 
> Thanks - please include that in the commit message - there are many
> TRMs (one for each GPU) so without the information about exactly which
> specification the page number is pretty useless. Sadly this
> documentation isn't public which would be even better but I don't
> think there are any public specs for this information.
> 
> >> However this change is correct - panfrost_exception_name() should
> >> be taking only the lower 8 bits. Even better though would be to to
> >> report the full raw fault information as well as the high bits can
> >> contain useful information:
> >>
> >> 	dev_warn(pfdev->dev, "GPU Fault 0x%08x (%s) at
> >> 0x%016llx\n", fault_status,
> >> 		 panfrost_exception_name(pfdev, fault_status &
> >> 0xFF), address);
> > 
> > So I change it according to what you said?
> 
> Yes, please send a v2.
> 
> Thanks,
> 
> Steve
> 
> > 于 Thu, 10 Jun 2021 11:41:52 +0100
> > Steven Price <steven.price@....com> 写道:
> > 
> >> The subject should have the prefix "drm/panfrost" and should
> >> mention what the patch is changing (not just the filename).
> >>
> >> On 09/06/2021 07:38, ChunyouTang wrote:
ok
> >>> From: tangchunyou <tangchunyou@....icubecorp.cn>
> >>>
> >>> The GPU exception fault status register(0x3C),the low 8 bit is the
> >>> EXCEPTION_TYPE.We can see the description at P3-78 in spec.
> >>
> >> Nit: When referring to a spec it's always good to mention the name
> >> - I'm not sure which specification you found this in.
> >>
> >>>
> >>> Signed-off-by: tangchunyou <tangchunyou@....icubecorp.cn>
> >>> ---
> >>>  drivers/gpu/drm/panfrost/panfrost_gpu.c | 2 +-
> >>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c
> >>> b/drivers/gpu/drm/panfrost/panfrost_gpu.c index
> >>> 2aae636f1cf5..1fffb6a0b24f 100644 ---
> >>> a/drivers/gpu/drm/panfrost/panfrost_gpu.c +++
> >>> b/drivers/gpu/drm/panfrost/panfrost_gpu.c @@ -33,7 +33,7 @@ static
> >>> irqreturn_t panfrost_gpu_irq_handler(int irq, void *data) address
> >>> |= gpu_read(pfdev, GPU_FAULT_ADDRESS_LO); 
> >>>  		dev_warn(pfdev->dev, "GPU Fault 0x%08x (%s) at
> >>> 0x%016llx\n",
> >>> -			 fault_status & 0xFF,
> >>> panfrost_exception_name(pfdev, fault_status),
> >>> +			 fault_status & 0xFF,
> >>> panfrost_exception_name(pfdev, fault_status & 0xFF),
> >>
> >> However this change is correct - panfrost_exception_name() should
> >> be taking only the lower 8 bits. Even better though would be to to
> >> report the full raw fault information as well as the high bits can
> >> contain useful information:
> >>
> >> 	dev_warn(pfdev->dev, "GPU Fault 0x%08x (%s) at
> >> 0x%016llx\n", fault_status,
> >> 		 panfrost_exception_name(pfdev, fault_status &
> >> 0xFF), address);
> >>
> >> Thanks,
> >>
> >> Steve
> >>
> >>>  			 address);
> >>>  
> >>>  		if (state & GPU_IRQ_MULTIPLE_FAULT)
> >>>
> > 
> >