drm/xe: Add stats for tlb invalidation count

Add stats for tlb invalidation count which can be viewed with per GT
stat debugfs file.

Example output:
cat /sys/kernel/debug/dri/0/gt0/stats
tlb_inval_count: 22

v2: fix #include order(Tejas)

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Sai Gowtham Ch <sai.gowtham.ch@intel.com>
Reviewed-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240810191522.18616-2-nirmoy.das@intel.comSigned-off-by: Nirmoy Das <nirmoy.das@intel.com>

drivers/gpu/drm/xe/xe_gt_stats.c

@@ -27,6 +27,7 @@ void xe_gt_stats_incr(struct xe_gt *gt, const enum xe_gt_stats_id id, int incr)
 }
 
 static const char *const stat_description[__XE_GT_STATS_NUM_IDS] = {
+	"tlb_inval_count",
 };
 
 /**

drivers/gpu/drm/xe/xe_gt_stats.h

@@ -10,6 +10,7 @@ struct xe_gt;
 struct drm_printer;
 
 enum xe_gt_stats_id {
+	XE_GT_STATS_ID_TLB_INVAL,
 	/* must be the last entry */
 	__XE_GT_STATS_NUM_IDS,
 };

drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c

@@ -12,6 +12,7 @@
 #include "xe_gt_printk.h"
 #include "xe_guc.h"
 #include "xe_guc_ct.h"
+#include "xe_gt_stats.h"
 #include "xe_mmio.h"
 #include "xe_pm.h"
 #include "xe_sriov.h"
@@ -213,6 +214,7 @@ static int send_tlb_invalidation(struct xe_guc *guc,
 			gt->tlb_invalidation.seqno = 1;
 	}
 	mutex_unlock(&guc->ct.lock);
+	xe_gt_stats_incr(gt, XE_GT_STATS_ID_TLB_INVAL, 1);
 
 	return ret;
 }