drm/i915: Add global forcewake request to drpc

We have seen multiple RC6 issues where it is useful to know
which global forcewake bits are set. Add this to the 'drpc'
debugfs output.

v2: Review comments (Ashutosh)
Reviewed-by: NAshutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: NVinay Belgaumkar <vinay.belgaumkar@intel.com>
Signed-off-by: NJohn Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220617212032.34577-1-vinay.belgaumkar@intel.com

drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c

@@ -100,14 +100,16 @@ static int vlv_drpc(struct seq_file *m)
 {
 	struct intel_gt *gt = m->private;
 	struct intel_uncore *uncore = gt->uncore;
-	u32 rcctl1, pw_status;
+	u32 rcctl1, pw_status, mt_fwake_req;
 
+	mt_fwake_req = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
 	pw_status = intel_uncore_read(uncore, VLV_GTLC_PW_STATUS);
 	rcctl1 = intel_uncore_read(uncore, GEN6_RC_CONTROL);
 
 	seq_printf(m, "RC6 Enabled: %s\n",
 		   str_yes_no(rcctl1 & (GEN7_RC_CTL_TO_MODE |
 					GEN6_RC_CTL_EI_MODE(1))));
+	seq_printf(m, "Multi-threaded Forcewake Request: 0x%x\n", mt_fwake_req);
 	seq_printf(m, "Render Power Well: %s\n",
 		   (pw_status & VLV_GTLC_PW_RENDER_STATUS_MASK) ? "Up" : "Down");
 	seq_printf(m, "Media Power Well: %s\n",
@@ -124,9 +126,10 @@ static int gen6_drpc(struct seq_file *m)
 	struct intel_gt *gt = m->private;
 	struct drm_i915_private *i915 = gt->i915;
 	struct intel_uncore *uncore = gt->uncore;
-	u32 gt_core_status, rcctl1, rc6vids = 0;
+	u32 gt_core_status, mt_fwake_req, rcctl1, rc6vids = 0;
 	u32 gen9_powergate_enable = 0, gen9_powergate_status = 0;
 
+	mt_fwake_req = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
 	gt_core_status = intel_uncore_read_fw(uncore, GEN6_GT_CORE_STATUS);
 
 	rcctl1 = intel_uncore_read(uncore, GEN6_RC_CONTROL);
@@ -178,6 +181,7 @@ static int gen6_drpc(struct seq_file *m)
 
 	seq_printf(m, "Core Power Down: %s\n",
 		   str_yes_no(gt_core_status & GEN6_CORE_CPD_STATE_MASK));
+	seq_printf(m, "Multi-threaded Forcewake Request: 0x%x\n", mt_fwake_req);
 	if (GRAPHICS_VER(i915) >= 9) {
 		seq_printf(m, "Render Power Well: %s\n",
 			   (gen9_powergate_status &