[PATCH 3/6] drm/xe/vf: Obtain value of GMDID register from GuC

[Matt Roper]

On Thu, May 23, 2024 at 09:22:37PM +0200, Michal Wajdeczko wrote:
> VFs don't have access to the GMDID register and must obtain it
> value using GuC VF ABI KLV query. Add function for doing that.
> 
> Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

> ---
>  drivers/gpu/drm/xe/xe_gt_sriov_vf.c | 29 +++++++++++++++++++++++++++++
>  drivers/gpu/drm/xe/xe_gt_sriov_vf.h |  1 +
>  2 files changed, 30 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
> index 237486a80fb5..5b8771f831f7 100644
> --- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
> +++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
> @@ -284,6 +284,35 @@ static int guc_action_query_single_klv64(struct xe_guc *guc, u32 key, u64 *value
>  	return 0;
>  }
>  
> +/**
> + * xe_gt_sriov_vf_gmdid - Query GMDID over MMIO.
> + * @gt: the &xe_gt
> + *
> + * This function is for VF use only.
> + *
> + * Return: value of GMDID KLV on success or 0 on failure.
> + */
> +u32 xe_gt_sriov_vf_gmdid(struct xe_gt *gt)
> +{
> +	const char *type = xe_gt_is_media_type(gt) ? "media" : "graphics";
> +	struct xe_guc *guc = &gt->uc.guc;
> +	u32 value;
> +	int err;
> +
> +	xe_gt_assert(gt, IS_SRIOV_VF(gt_to_xe(gt)));
> +	xe_gt_assert(gt, gt->sriov.vf.guc_version.major > 1 || gt->sriov.vf.guc_version.minor >= 2);
> +
> +	err = guc_action_query_single_klv32(guc, GUC_KLV_GLOBAL_CFG_GMD_ID_KEY, &value);
> +	if (unlikely(err)) {
> +		xe_gt_sriov_err(gt, "Failed to obtain %s GMDID (%pe)\n",
> +				type, ERR_PTR(err));
> +		return 0;
> +	}
> +
> +	xe_gt_sriov_dbg(gt, "%s GMDID = %#x\n", type, value);
> +	return value;
> +}
> +
>  static int vf_get_ggtt_info(struct xe_gt *gt)
>  {
>  	struct xe_gt_sriov_vf_selfconfig *config = &gt->sriov.vf.self_config;
> diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.h b/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
> index be69c1025320..0391ed72a570 100644
> --- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
> +++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
> @@ -17,6 +17,7 @@ int xe_gt_sriov_vf_query_config(struct xe_gt *gt);
>  int xe_gt_sriov_vf_connect(struct xe_gt *gt);
>  int xe_gt_sriov_vf_query_runtime(struct xe_gt *gt);
>  
> +u32 xe_gt_sriov_vf_gmdid(struct xe_gt *gt);
>  u16 xe_gt_sriov_vf_guc_ids(struct xe_gt *gt);
>  u32 xe_gt_sriov_vf_read32(struct xe_gt *gt, struct xe_reg reg);
>  
> -- 
> 2.43.0
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation