[PATCH 4/4] drm/xe/vf: Ignore force-wake requests if VF

[Rodrigo Vivi]

On Mon, Jun 10, 2024 at 08:37:57PM +0200, Michal Wajdeczko wrote:
> The control and ack force-wake registers are not accessible for
> the VF drivers. To avoid changing existing code logic that tracks
> woken domains, simply ignore all attempts to access control or ack
> registers if we are running as a VF driver.
> 

Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

> Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
> ---
>  drivers/gpu/drm/xe/xe_force_wake.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/xe_force_wake.c b/drivers/gpu/drm/xe/xe_force_wake.c
> index b0baa9094418..4d472192e87b 100644
> --- a/drivers/gpu/drm/xe/xe_force_wake.c
> +++ b/drivers/gpu/drm/xe/xe_force_wake.c
> @@ -12,6 +12,7 @@
>  #include "xe_gt.h"
>  #include "xe_gt_printk.h"
>  #include "xe_mmio.h"
> +#include "xe_sriov.h"
>  
>  #define XE_FORCE_WAKE_ACK_TIMEOUT_MS	50
>  
> @@ -101,6 +102,9 @@ void xe_force_wake_init_engines(struct xe_gt *gt, struct xe_force_wake *fw)
>  
>  static void __domain_ctl(struct xe_gt *gt, struct xe_force_wake_domain *domain, bool wake)
>  {
> +	if (IS_SRIOV(gt_to_xe(gt)))
> +		return;
> +
>  	xe_mmio_write32(gt, domain->reg_ctl, domain->mask | (wake ? domain->val : 0));
>  }
>  
> @@ -109,6 +113,9 @@ static int __domain_wait(struct xe_gt *gt, struct xe_force_wake_domain *domain,
>  	u32 value;
>  	int ret;
>  
> +	if (IS_SRIOV(gt_to_xe(gt)))
> +		return 0;
> +
>  	ret = xe_mmio_wait32(gt, domain->reg_ack, domain->val, wake ? domain->val : 0,
>  			     XE_FORCE_WAKE_ACK_TIMEOUT_MS * USEC_PER_MSEC,
>  			     &value, true);
> -- 
> 2.43.0
>