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charset="us-ascii" Content-Transfer-Encoding: quoted-printable [AMD Official Use Only] +Mario I guess that means the functionality needs to be present in amdgpu for APUs= also. Presently, this is taken care by PMC driver for APUs. Thanks, Lijo ________________________________ From: amd-gfx on behalf of Andrey G= rodzovsky Sent: Tuesday, March 8, 2022 9:55:03 PM To: Shashank Sharma ; amd-gfx@lists.freede= sktop.org Cc: Deucher, Alexander ; Somalapuram, Amaranath = ; Koenig, Christian ; Sharma, Shashank Subject: Re: [PATCH 1/2] drm: Add GPU reset sysfs event On 2022-03-07 11:26, Shashank Sharma wrote: > From: Shashank Sharma > > This patch adds a new sysfs event, which will indicate > the userland about a GPU reset, and can also provide > some information like: > - which PID was involved in the GPU reset > - what was the GPU status (using flags) > > This patch also introduces the first flag of the flags > bitmap, which can be appended as and when required. I am reminding again about another important piece of info which you can ad= d here and that is Smart Trace Buffer dump [1]. The buffer size is HW specific but from what I see there is no problem to just amend it as part of envp[] initialization. bellow. The interface to get the buffer is smu_stb_collect_info and usage can be seen from frebugfs interface in smu_stb_debugfs_open [1] - https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fw= ww.spinics.net%2Flists%2Famd-gfx%2Fmsg70751.html&data=3D04%7C01%7Clijo.= lazar%40amd.com%7C80bc3f07e2d0441d44a108da012036dc%7C3dd8961fe4884e608e11a8= 2d994e183d%7C0%7C0%7C637823535167679490%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4= wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=3D= 53l7KlTf%2BICKkZkLVwFh6nRTjkAh%2FDpOat5DRoyKIx0%3D&reserved=3D0 Andrey > > Cc: Alexandar Deucher > Cc: Christian Koenig > Signed-off-by: Shashank Sharma > --- > drivers/gpu/drm/drm_sysfs.c | 24 ++++++++++++++++++++++++ > include/drm/drm_sysfs.h | 3 +++ > 2 files changed, 27 insertions(+) > > diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c > index 430e00b16eec..52a015161431 100644 > --- a/drivers/gpu/drm/drm_sysfs.c > +++ b/drivers/gpu/drm/drm_sysfs.c > @@ -409,6 +409,30 @@ void drm_sysfs_hotplug_event(struct drm_device *dev) > } > EXPORT_SYMBOL(drm_sysfs_hotplug_event); > > +/** > + * drm_sysfs_reset_event - generate a DRM uevent to indicate GPU reset > + * @dev: DRM device > + * @pid: The process ID involve with the reset > + * @flags: Any other information about the GPU status > + * > + * Send a uevent for the DRM device specified by @dev. This indicates > + * user that a GPU reset has occurred, so that the interested client > + * can take any recovery or profiling measure, when required. > + */ > +void drm_sysfs_reset_event(struct drm_device *dev, uint64_t pid, uint32_= t flags) > +{ > + unsigned char pid_str[21], flags_str[15]; > + unsigned char reset_str[] =3D "RESET=3D1"; > + char *envp[] =3D { reset_str, pid_str, flags_str, NULL }; > + > + DRM_DEBUG("generating reset event\n"); > + > + snprintf(pid_str, ARRAY_SIZE(pid_str), "PID=3D%lu", pid); > + snprintf(flags_str, ARRAY_SIZE(flags_str), "FLAGS=3D%u", flags); > + kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp); > +} > +EXPORT_SYMBOL(drm_sysfs_reset_event); > + > /** > * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any co= nnector > * change > diff --git a/include/drm/drm_sysfs.h b/include/drm/drm_sysfs.h > index 6273cac44e47..63f00fe8054c 100644 > --- a/include/drm/drm_sysfs.h > +++ b/include/drm/drm_sysfs.h > @@ -2,6 +2,8 @@ > #ifndef _DRM_SYSFS_H_ > #define _DRM_SYSFS_H_ > > +#define DRM_GPU_RESET_FLAG_VRAM_VALID (1 << 0) > + > struct drm_device; > struct device; > struct drm_connector; > @@ -11,6 +13,7 @@ int drm_class_device_register(struct device *dev); > void drm_class_device_unregister(struct device *dev); > > void drm_sysfs_hotplug_event(struct drm_device *dev); > +void drm_sysfs_reset_event(struct drm_device *dev, uint64_t pid, uint32_= t reset_flags); > void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)= ; > void drm_sysfs_connector_status_event(struct drm_connector *connector, > struct drm_property *property); --_000_BYAPR12MB461498EFB1E9A3A76A38735497099BYAPR12MB4614namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

[AMD Official Use Only]


+Mario

I guess that means the functionality needs to be present in amdgpu for APUs= also. Presently, this is taken care by PMC driver for APUs.

Thanks,
Lijo
From: amd-gfx <amd-gfx-b= ounces@lists.freedesktop.org> on behalf of Andrey Grodzovsky <andrey.= grodzovsky@amd.com>
Sent: Tuesday, March 8, 2022 9:55:03 PM
To: Shashank Sharma <contactshashanksharma@gmail.com>; amd-gfx= @lists.freedesktop.org <amd-gfx@lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher@amd.com>; Somalapura= m, Amaranath <Amaranath.Somalapuram@amd.com>; Koenig, Christian <C= hristian.Koenig@amd.com>; Sharma, Shashank <Shashank.Sharma@amd.com&g= t;
Subject: Re: [PATCH 1/2] drm: Add GPU reset sysfs event
 

On 2022-03-07 11:26, Shashank Sharma wrote:
> From: Shashank Sharma <shashank.sharma@amd.com>
>
> This patch adds a new sysfs event, which will indicate
> the userland about a GPU reset, and can also provide
> some information like:
> - which PID was involved in the GPU reset
> - what was the GPU status (using flags)
>
> This patch also introduces the first flag of the flags
> bitmap, which can be appended as and when required.


I am reminding again about another important piece of info which you can ad= d
here and that is Smart Trace Buffer dump [1]. The buffer size is HW
specific but
from what I see there is no problem to just amend it as part of envp[]
initialization.
bellow.

The interface to get the buffer is smu_stb_collect_info and usage can be seen from
frebugfs interface in smu_stb_debugfs_open

[1] - https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.spi= nics.net%2Flists%2Famd-gfx%2Fmsg70751.html&amp;data=3D04%7C01%7Clijo.la= zar%40amd.com%7C80bc3f07e2d0441d44a108da012036dc%7C3dd8961fe4884e608e11a82d= 994e183d%7C0%7C0%7C637823535167679490%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wL= jAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata= =3D53l7KlTf%2BICKkZkLVwFh6nRTjkAh%2FDpOat5DRoyKIx0%3D&amp;reserved=3D0<= /a>

Andrey


>
> Cc: Alexandar Deucher <alexander.deucher@amd.com>
> Cc: Christian Koenig <christian.koenig@amd.com>
> Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
> ---
>   drivers/gpu/drm/drm_sysfs.c | 24 ++++++++++++++++++++++++<= br> >   include/drm/drm_sysfs.h     |  3 = +++
>   2 files changed, 27 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c=
> index 430e00b16eec..52a015161431 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -409,6 +409,30 @@ void drm_sysfs_hotplug_event(struct drm_device *d= ev)
>   }
>   EXPORT_SYMBOL(drm_sysfs_hotplug_event);
>  
> +/**
> + * drm_sysfs_reset_event - generate a DRM uevent to indicate GPU rese= t
> + * @dev: DRM device
> + * @pid: The process ID involve with the reset
> + * @flags: Any other information about the GPU status
> + *
> + * Send a uevent for the DRM device specified by @dev. This indicates=
> + * user that a GPU reset has occurred, so that the interested client<= br> > + * can take any recovery or profiling measure, when required.
> + */
> +void drm_sysfs_reset_event(struct drm_device *dev, uint64_t pid, uint= 32_t flags)
> +{
> +     unsigned char pid_str[21], flags_str[15]; > +     unsigned char reset_str[] =3D "RESET=3D= 1";
> +     char *envp[] =3D { reset_str, pid_str, flags= _str, NULL };
> +
> +     DRM_DEBUG("generating reset event\n&quo= t;);
> +
> +     snprintf(pid_str, ARRAY_SIZE(pid_str), "= ;PID=3D%lu", pid);
> +     snprintf(flags_str, ARRAY_SIZE(flags_str), &= quot;FLAGS=3D%u", flags);
> +     kobject_uevent_env(&dev->primary->= kdev->kobj, KOBJ_CHANGE, envp);
> +}
> +EXPORT_SYMBOL(drm_sysfs_reset_event);
> +
>   /**
>    * drm_sysfs_connector_hotplug_event - generate a DRM= uevent for any connector
>    * change
> diff --git a/include/drm/drm_sysfs.h b/include/drm/drm_sysfs.h
> index 6273cac44e47..63f00fe8054c 100644
> --- a/include/drm/drm_sysfs.h
> +++ b/include/drm/drm_sysfs.h
> @@ -2,6 +2,8 @@
>   #ifndef _DRM_SYSFS_H_
>   #define _DRM_SYSFS_H_
>  
> +#define DRM_GPU_RESET_FLAG_VRAM_VALID (1 << 0)
> +
>   struct drm_device;
>   struct device;
>   struct drm_connector;
> @@ -11,6 +13,7 @@ int drm_class_device_register(struct device *dev); >   void drm_class_device_unregister(struct device *dev);
>  
>   void drm_sysfs_hotplug_event(struct drm_device *dev);
> +void drm_sysfs_reset_event(struct drm_device *dev, uint64_t pid, uint= 32_t reset_flags);
>   void drm_sysfs_connector_hotplug_event(struct drm_connecto= r *connector);
>   void drm_sysfs_connector_status_event(struct drm_connector= *connector,
>            = ;            &n= bsp;            = ; struct drm_property *property);
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