drm/xe/vf: Ignore force-wake requests if VF

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.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240611163537.1944-6-michal.wajdeczko@intel.com

diff --git a/drivers/gpu/drm/xe/xe_force_wake.c b/drivers/gpu/drm/xe/xe_force_wake.c
index 468aabd..5db6926 100644 (file)
--- 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
 
@@ -96,6 +97,9 @@ 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));
 }
 
@@ -104,6 +108,9 @@ 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);