[PATCH 3/3] drm/xe/vf: Fix guc_info debugfs for VFs

[Laguna, Lukasz]

On 4/8/2025 23:31, Daniele Ceraolo Spurio wrote:
> The guc_info debugfs attempta to read a bunch of registers that the VFs

typo: attempta/attempt

> doesn't have access to, so fix it by skipping the reads.
>
> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
> Cc: Lukasz Laguna <lukasz.laguna at intel.com>

Reviewed-by: Lukasz Laguna <lukasz.laguna at intel.com>

> ---
>   drivers/gpu/drm/xe/xe_guc.c | 44 +++++++++++++++++++------------------
>   1 file changed, 23 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/xe/xe_guc.c b/drivers/gpu/drm/xe/xe_guc.c
> index 38866135c019..17932006619a 100644
> --- a/drivers/gpu/drm/xe/xe_guc.c
> +++ b/drivers/gpu/drm/xe/xe_guc.c
> @@ -1509,30 +1509,32 @@ void xe_guc_print_info(struct xe_guc *guc, struct drm_printer *p)
>   
>   	xe_uc_fw_print(&guc->fw, p);
>   
> -	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> -	if (!fw_ref)
> -		return;
> +	if (!IS_SRIOV_VF(gt_to_xe(gt))) {
> +		fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
> +		if (!fw_ref)
> +			return;
> +
> +		status = xe_mmio_read32(&gt->mmio, GUC_STATUS);
> +
> +		drm_printf(p, "\nGuC status 0x%08x:\n", status);
> +		drm_printf(p, "\tBootrom status = 0x%x\n",
> +			   REG_FIELD_GET(GS_BOOTROM_MASK, status));
> +		drm_printf(p, "\tuKernel status = 0x%x\n",
> +			   REG_FIELD_GET(GS_UKERNEL_MASK, status));
> +		drm_printf(p, "\tMIA Core status = 0x%x\n",
> +			   REG_FIELD_GET(GS_MIA_MASK, status));
> +		drm_printf(p, "\tLog level = %d\n",
> +			   xe_guc_log_get_level(&guc->log));
> +
> +		drm_puts(p, "\nScratch registers:\n");
> +		for (i = 0; i < SOFT_SCRATCH_COUNT; i++) {
> +			drm_printf(p, "\t%2d: \t0x%x\n",
> +				   i, xe_mmio_read32(&gt->mmio, SOFT_SCRATCH(i)));
> +		}
>   
> -	status = xe_mmio_read32(&gt->mmio, GUC_STATUS);
> -
> -	drm_printf(p, "\nGuC status 0x%08x:\n", status);
> -	drm_printf(p, "\tBootrom status = 0x%x\n",
> -		   REG_FIELD_GET(GS_BOOTROM_MASK, status));
> -	drm_printf(p, "\tuKernel status = 0x%x\n",
> -		   REG_FIELD_GET(GS_UKERNEL_MASK, status));
> -	drm_printf(p, "\tMIA Core status = 0x%x\n",
> -		   REG_FIELD_GET(GS_MIA_MASK, status));
> -	drm_printf(p, "\tLog level = %d\n",
> -		   xe_guc_log_get_level(&guc->log));
> -
> -	drm_puts(p, "\nScratch registers:\n");
> -	for (i = 0; i < SOFT_SCRATCH_COUNT; i++) {
> -		drm_printf(p, "\t%2d: \t0x%x\n",
> -			   i, xe_mmio_read32(&gt->mmio, SOFT_SCRATCH(i)));
> +		xe_force_wake_put(gt_to_fw(gt), fw_ref);
>   	}
>   
> -	xe_force_wake_put(gt_to_fw(gt), fw_ref);
> -
>   	drm_puts(p, "\n");
>   	xe_guc_ct_print(&guc->ct, p, false);
>