[PATCH] drm/xe: Enable SR-IOV for PTL

[Kolakowski, Jakub1]

-----Original Message-----
From: Wajdeczko, Michal <Michal.Wajdeczko at intel.com> 
Sent: Thursday, February 6, 2025 10:46 PM
To: intel-xe at lists.freedesktop.org
Cc: Wajdeczko, Michal <Michal.Wajdeczko at intel.com>; Vivi, Rodrigo <rodrigo.vivi at intel.com>; De Marchi, Lucas <lucas.demarchi at intel.com>; Thomas Hellstrom <thomas.hellstrom at linux.intel.com>; Piorkowski, Piotr <piotr.piorkowski at intel.com>; Kolakowski, Jakub1 <jakub1.kolakowski at intel.com>; Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
Subject: [PATCH] drm/xe: Enable SR-IOV for PTL

> We should now have sufficient changes in the driver to run it on PTL platforms in the SR-IOV Physical Function (PF) mode, that would allow us to enable SR-IOV Virtual Functions (VFs), and successfully probe our driver in the VF mode on enabled VF devices.
> 
> To unblock SR-IOV PF mode you need to load xe with modparam:
> 
>  xe.max_vfs=7
> 
> Then to enable VFs it is sufficient to use:
> 
>  $ echo 7 > /sys/bus/pci/devices/0000:00:02.0/sriov_numvfs
> 
> Note that in default auto-provisioning all VFs are allocated with some amount of shared resources (like unlimited GPU execution and preemption times, fair GGTT space, fair GuC context IDs range, ...)
> 
> However with CONFIG_DEBUG_FS enabled it is possible to tweak most of the SR-IOV configuration parameters using attributes like:
> 
>  /sys/kernel/debug/dri/0000:00:02.0/gt0/
>  ├── pf
>  │   ├── contexts_spare
>  │   ├── doorbells_spare
>  │   ├── exec_quantum_ms
>  │   ├── ggtt_spare
>  │   ├── preempt_timeout_us
>  │   ├── sched_priority
>  │   └── ...
>  ├── vf1
>  │   ├── contexts_quota
>  │   ├── doorbells_quota
>  │   ├── exec_quantum_ms
>  │   ├── ggtt_quota
>  │   ├── preempt_timeout_us
>  │   ├── sched_priority
>  │   └── ...
>  ├── vf2
>  │   └── ...
>  :
> 
> Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> Cc: Thomas Hellstrom <thomas.hellstrom at linux.intel.com>
> ---
> Cc: Piotr Piórkowski <piotr.piorkowski at intel.com>
> Cc: Jakub Kolakowski <jakub1.kolakowski at intel.com>
> Cc: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
> ---
>  drivers/gpu/drm/xe/xe_pci.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c index e8ef7d6b4db8..6a8e82aff385 100644
> --- a/drivers/gpu/drm/xe/xe_pci.c
> +++ b/drivers/gpu/drm/xe/xe_pci.c
> @@ -367,6 +367,7 @@ static const struct xe_device_desc ptl_desc = {
>  	 PLATFORM(PANTHERLAKE),
>  	 .dma_mask_size = 46,
>  	 .has_display = true,
> +	 .has_sriov = true,

Reviewed-by: Jakub Kolakowski <jakub1.kolakowski at intel.com>

>  	 .require_force_probe = true,
>  };
>  
> --
> 2.47.1