drm/xe/pf: Allow to control scheduling priority using debugfs

Add 'sched_priority' attribute that will represents the scheduling
prority of the VF or PF. Values {0,1,2} correspond to priorities
{LOW,NORMAL,HIGH} respectively.

Signed-off-by: Michal Wajdeczko <[e-mail]>
Reviewed-by: Lukasz Laguna <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/xe/xe_gt_sriov_pf_debugfs.c

···
  *      │   │   ├── contexts_spare
  *      │   │   ├── exec_quantum_ms
  *      │   │   ├── preempt_timeout_us
+ *      │   │   ├── sched_priority
  *      │   ├── vf1
  *      │   │   ├── ggtt_quota
  *      │   │   ├── lmem_quota
···
  *      │   │   ├── contexts_quota
  *      │   │   ├── exec_quantum_ms
  *      │   │   ├── preempt_timeout_us
+ *      │   │   ├── sched_priority
  */
 
 #define DEFINE_SRIOV_GT_CONFIG_DEBUGFS_ATTRIBUTE(CONFIG, TYPE, FORMAT)		\
···
 DEFINE_SRIOV_GT_CONFIG_DEBUGFS_ATTRIBUTE(dbs, u32, "%llu\n");
 DEFINE_SRIOV_GT_CONFIG_DEBUGFS_ATTRIBUTE(exec_quantum, u32, "%llu\n");
 DEFINE_SRIOV_GT_CONFIG_DEBUGFS_ATTRIBUTE(preempt_timeout, u32, "%llu\n");
+DEFINE_SRIOV_GT_CONFIG_DEBUGFS_ATTRIBUTE(sched_priority, u32, "%llu\n");
 
 /*
  *      /sys/kernel/debug/dri/0/
···
 				   &exec_quantum_fops);
 	debugfs_create_file_unsafe("preempt_timeout_us", 0644, parent, parent,
 				   &preempt_timeout_fops);
+	debugfs_create_file_unsafe("sched_priority", 0644, parent, parent,
+				   &sched_priority_fops);
 
 	/* register all threshold attributes */
 #define register_threshold_attribute(TAG, NAME, ...) \