[PATCH 30/71] drm/i915: Replace pcu_lock with sb_lock

[Chris Wilson <chris@chris-wilson.co.uk>]

We now have two locks for sideband access. The general one covering
sideband access across all generation, sb_lock, and a specific one
covering sideband access via the punit on vlv/chv. After lifting the
sb_lock around the punit into the callers, the pcu_lock is now redudant
and can be separated from its other use to regulate RPS (essentially
giving RPS a lock all of its own).

v2: Extract a couple of minor bug fixes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c     |  23 +----
 drivers/gpu/drm/i915/i915_drv.h         |  10 +-
 drivers/gpu/drm/i915/i915_irq.c         |   4 +-
 drivers/gpu/drm/i915/i915_sysfs.c       |  32 +++---
 drivers/gpu/drm/i915/intel_cdclk.c      |  28 ------
 drivers/gpu/drm/i915/intel_display.c    |   6 --
 drivers/gpu/drm/i915/intel_hdcp.c       |   2 -
 drivers/gpu/drm/i915/intel_pm.c         | 127 ++++++++++++------------
 drivers/gpu/drm/i915/intel_runtime_pm.c |   8 --
 drivers/gpu/drm/i915/intel_sideband.c   |   4 -
 10 files changed, 81 insertions(+), 163 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 4a6a5033e914..ef9e7f590f5e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1077,8 +1077,6 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
 	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		u32 rpmodectl, freq_sts;
 
-		mutex_lock(&dev_priv->pcu_lock);
-
 		rpmodectl = I915_READ(GEN6_RP_CONTROL);
 		seq_printf(m, "Video Turbo Mode: %s\n",
 			   yesno(rpmodectl & GEN6_RP_MEDIA_TURBO));
@@ -1113,7 +1111,6 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
 		seq_printf(m,
 			   "efficient (RPe) frequency: %d MHz\n",
 			   intel_gpu_freq(dev_priv, rps->efficient_freq));
-		mutex_unlock(&dev_priv->pcu_lock);
 	} else if (INTEL_GEN(dev_priv) >= 6) {
 		u32 rp_state_limits;
 		u32 gt_perf_status;
@@ -1527,12 +1524,9 @@ static int gen6_drpc_info(struct seq_file *m)
 		gen9_powergate_status = I915_READ(GEN9_PWRGT_DOMAIN_STATUS);
 	}
 
-	if (INTEL_GEN(dev_priv) <= 7) {
-		mutex_lock(&dev_priv->pcu_lock);
+	if (INTEL_GEN(dev_priv) <= 7)
 		sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS,
 				       &rc6vids);
-		mutex_unlock(&dev_priv->pcu_lock);
-	}
 
 	seq_printf(m, "RC1e Enabled: %s\n",
 		   yesno(rcctl1 & GEN6_RC_CTL_RC1e_ENABLE));
@@ -1803,17 +1797,10 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
 	struct intel_rps *rps = &dev_priv->gt_pm.rps;
 	unsigned int max_gpu_freq, min_gpu_freq;
 	int gpu_freq, ia_freq;
-	int ret;
 
 	if (!HAS_LLC(dev_priv))
 		return -ENODEV;
 
-	intel_runtime_pm_get(dev_priv);
-
-	ret = mutex_lock_interruptible(&dev_priv->pcu_lock);
-	if (ret)
-		goto out;
-
 	min_gpu_freq = rps->min_freq;
 	max_gpu_freq = rps->max_freq;
 	if (IS_GEN9_BC(dev_priv) || INTEL_GEN(dev_priv) >= 10) {
@@ -1824,6 +1811,7 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
 
 	seq_puts(m, "GPU freq (MHz)\tEffective CPU freq (MHz)\tEffective Ring freq (MHz)\n");
 
+	intel_runtime_pm_get(dev_priv);
 	for (gpu_freq = min_gpu_freq; gpu_freq <= max_gpu_freq; gpu_freq++) {
 		ia_freq = gpu_freq;
 		sandybridge_pcode_read(dev_priv,
@@ -1837,12 +1825,9 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
 			   ((ia_freq >> 0) & 0xff) * 100,
 			   ((ia_freq >> 8) & 0xff) * 100);
 	}
-
-	mutex_unlock(&dev_priv->pcu_lock);
-
-out:
 	intel_runtime_pm_put(dev_priv);
-	return ret;
+
+	return 0;
 }
 
 static int i915_opregion(struct seq_file *m, void *unused)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 513a8e69e13e..e712cc9c82a5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -741,6 +741,8 @@ struct intel_rps_ei {
 };
 
 struct intel_rps {
+	struct mutex lock;
+
 	/*
 	 * work, interrupts_enabled and pm_iir are protected by
 	 * dev_priv->irq_lock
@@ -1793,14 +1795,6 @@ struct drm_i915_private {
 	/* Cannot be determined by PCIID. You must always read a register. */
 	u32 edram_cap;
 
-	/*
-	 * Protects RPS/RC6 register access and PCU communication.
-	 * Must be taken after struct_mutex if nested. Note that
-	 * this lock may be held for long periods of time when
-	 * talking to hw - so only take it when talking to hw!
-	 */
-	struct mutex pcu_lock;
-
 	/* gen6+ GT PM state */
 	struct intel_gen6_power_mgmt gt_pm;
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index f9bc3aaa90d0..34bbf0dd00ed 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1265,7 +1265,7 @@ static void gen6_pm_rps_work(struct work_struct *work)
 	if ((pm_iir & dev_priv->pm_rps_events) == 0 && !client_boost)
 		goto out;
 
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&rps->lock);
 
 	pm_iir |= vlv_wa_c0_ei(dev_priv, pm_iir);
 
@@ -1319,7 +1319,7 @@ static void gen6_pm_rps_work(struct work_struct *work)
 		rps->last_adj = 0;
 	}
 
-	mutex_unlock(&dev_priv->pcu_lock);
+	mutex_unlock(&rps->lock);
 
 out:
 	/* Make sure not to corrupt PMIMR state used by ringbuffer on GEN6 */
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 0519e00b3720..c98375ba79b4 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -262,7 +262,6 @@ static ssize_t gt_act_freq_mhz_show(struct device *kdev,
 
 	intel_runtime_pm_get(dev_priv);
 
-	mutex_lock(&dev_priv->pcu_lock);
 	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		vlv_punit_get(dev_priv);
 		freq = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
@@ -272,7 +271,6 @@ static ssize_t gt_act_freq_mhz_show(struct device *kdev,
 	} else {
 		freq = intel_get_cagf(dev_priv, I915_READ(GEN6_RPSTAT1));
 	}
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	intel_runtime_pm_put(dev_priv);
 
@@ -317,12 +315,12 @@ static ssize_t gt_boost_freq_mhz_store(struct device *kdev,
 	if (val < rps->min_freq || val > rps->max_freq)
 		return -EINVAL;
 
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&rps->lock);
 	if (val != rps->boost_freq) {
 		rps->boost_freq = val;
 		boost = atomic_read(&rps->num_waiters);
 	}
-	mutex_unlock(&dev_priv->pcu_lock);
+	mutex_unlock(&rps->lock);
 	if (boost)
 		schedule_work(&rps->work);
 
@@ -362,17 +360,14 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
 		return ret;
 
 	intel_runtime_pm_get(dev_priv);
-
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&rps->lock);
 
 	val = intel_freq_opcode(dev_priv, val);
-
 	if (val < rps->min_freq ||
 	    val > rps->max_freq ||
 	    val < rps->min_freq_softlimit) {
-		mutex_unlock(&dev_priv->pcu_lock);
-		intel_runtime_pm_put(dev_priv);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto unlock;
 	}
 
 	if (val > rps->rp0_freq)
@@ -390,8 +385,8 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
 	 * frequency request may be unchanged. */
 	ret = intel_set_rps(dev_priv, val);
 
-	mutex_unlock(&dev_priv->pcu_lock);
-
+unlock:
+	mutex_unlock(&rps->lock);
 	intel_runtime_pm_put(dev_priv);
 
 	return ret ?: count;
@@ -420,17 +415,14 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
 		return ret;
 
 	intel_runtime_pm_get(dev_priv);
-
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&rps->lock);
 
 	val = intel_freq_opcode(dev_priv, val);
-
 	if (val < rps->min_freq ||
 	    val > rps->max_freq ||
 	    val > rps->max_freq_softlimit) {
-		mutex_unlock(&dev_priv->pcu_lock);
-		intel_runtime_pm_put(dev_priv);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto unlock;
 	}
 
 	rps->min_freq_softlimit = val;
@@ -444,8 +436,8 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
 	 * frequency request may be unchanged. */
 	ret = intel_set_rps(dev_priv, val);
 
-	mutex_unlock(&dev_priv->pcu_lock);
-
+unlock:
+	mutex_unlock(&rps->lock);
 	intel_runtime_pm_put(dev_priv);
 
 	return ret ?: count;
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 30341147121f..ad0c14bbb2e5 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -461,7 +461,6 @@ static void vlv_get_cdclk(struct drm_i915_private *dev_priv,
 {
 	u32 val;
 
-	mutex_lock(&dev_priv->pcu_lock);
 	vlv_iosf_sb_get(dev_priv,
 			BIT(VLV_IOSF_SB_CCK) | BIT(VLV_IOSF_SB_PUNIT));
 
@@ -474,7 +473,6 @@ static void vlv_get_cdclk(struct drm_i915_private *dev_priv,
 
 	vlv_iosf_sb_put(dev_priv,
 			BIT(VLV_IOSF_SB_CCK) | BIT(VLV_IOSF_SB_PUNIT));
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	if (IS_VALLEYVIEW(dev_priv))
 		cdclk_state->voltage_level = (val & DSPFREQGUAR_MASK) >>
@@ -551,7 +549,6 @@ static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
 			BIT(VLV_IOSF_SB_BUNIT) |
 			BIT(VLV_IOSF_SB_PUNIT));
 
-	mutex_lock(&dev_priv->pcu_lock);
 	val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
 	val &= ~DSPFREQGUAR_MASK;
 	val |= (cmd << DSPFREQGUAR_SHIFT);
@@ -561,7 +558,6 @@ static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
 		     50)) {
 		DRM_ERROR("timed out waiting for CDclk change\n");
 	}
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	if (cdclk == 400000) {
 		u32 divider;
@@ -632,7 +628,6 @@ static void chv_set_cdclk(struct drm_i915_private *dev_priv,
 	 */
 	intel_display_power_get(dev_priv, POWER_DOMAIN_PIPE_A);
 
-	mutex_lock(&dev_priv->pcu_lock);
 	vlv_punit_get(dev_priv);
 
 	val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
@@ -646,7 +641,6 @@ static void chv_set_cdclk(struct drm_i915_private *dev_priv,
 	}
 
 	vlv_punit_put(dev_priv);
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	intel_update_cdclk(dev_priv);
 
@@ -724,10 +718,8 @@ static void bdw_set_cdclk(struct drm_i915_private *dev_priv,
 		 "trying to change cdclk frequency with cdclk not enabled\n"))
 		return;
 
-	mutex_lock(&dev_priv->pcu_lock);
 	ret = sandybridge_pcode_write(dev_priv,
 				      BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ, 0x0);
-	mutex_unlock(&dev_priv->pcu_lock);
 	if (ret) {
 		DRM_ERROR("failed to inform pcode about cdclk change\n");
 		return;
@@ -776,10 +768,8 @@ static void bdw_set_cdclk(struct drm_i915_private *dev_priv,
 			LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
 		DRM_ERROR("Switching back to LCPLL failed\n");
 
-	mutex_lock(&dev_priv->pcu_lock);
 	sandybridge_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ,
 				cdclk_state->voltage_level);
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	I915_WRITE(CDCLK_FREQ, DIV_ROUND_CLOSEST(cdclk, 1000) - 1);
 
@@ -1007,12 +997,10 @@ static void skl_set_cdclk(struct drm_i915_private *dev_priv,
 	u32 freq_select, cdclk_ctl;
 	int ret;
 
-	mutex_lock(&dev_priv->pcu_lock);
 	ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL,
 				SKL_CDCLK_PREPARE_FOR_CHANGE,
 				SKL_CDCLK_READY_FOR_CHANGE,
 				SKL_CDCLK_READY_FOR_CHANGE, 3);
-	mutex_unlock(&dev_priv->pcu_lock);
 	if (ret) {
 		DRM_ERROR("Failed to inform PCU about cdclk change (%d)\n",
 			  ret);
@@ -1076,10 +1064,8 @@ static void skl_set_cdclk(struct drm_i915_private *dev_priv,
 	POSTING_READ(CDCLK_CTL);
 
 	/* inform PCU of the change */
-	mutex_lock(&dev_priv->pcu_lock);
 	sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
 				cdclk_state->voltage_level);
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	intel_update_cdclk(dev_priv);
 }
@@ -1391,12 +1377,9 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 	 * requires us to wait up to 150usec, but that leads to timeouts;
 	 * the 2ms used here is based on experiment.
 	 */
-	mutex_lock(&dev_priv->pcu_lock);
 	ret = sandybridge_pcode_write_timeout(dev_priv,
 					      HSW_PCODE_DE_WRITE_FREQ_REQ,
 					      0x80000000, 150, 2);
-	mutex_unlock(&dev_priv->pcu_lock);
-
 	if (ret) {
 		DRM_ERROR("PCode CDCLK freq change notify failed (err %d, freq %d)\n",
 			  ret, cdclk);
@@ -1424,7 +1407,6 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 		val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
 	I915_WRITE(CDCLK_CTL, val);
 
-	mutex_lock(&dev_priv->pcu_lock);
 	/*
 	 * The timeout isn't specified, the 2ms used here is based on
 	 * experiment.
@@ -1434,8 +1416,6 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 	ret = sandybridge_pcode_write_timeout(dev_priv,
 					      HSW_PCODE_DE_WRITE_FREQ_REQ,
 					      cdclk_state->voltage_level, 150, 2);
-	mutex_unlock(&dev_priv->pcu_lock);
-
 	if (ret) {
 		DRM_ERROR("PCode CDCLK freq set failed, (err %d, freq %d)\n",
 			  ret, cdclk);
@@ -1673,12 +1653,10 @@ static void cnl_set_cdclk(struct drm_i915_private *dev_priv,
 	u32 val, divider;
 	int ret;
 
-	mutex_lock(&dev_priv->pcu_lock);
 	ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL,
 				SKL_CDCLK_PREPARE_FOR_CHANGE,
 				SKL_CDCLK_READY_FOR_CHANGE,
 				SKL_CDCLK_READY_FOR_CHANGE, 3);
-	mutex_unlock(&dev_priv->pcu_lock);
 	if (ret) {
 		DRM_ERROR("Failed to inform PCU about cdclk change (%d)\n",
 			  ret);
@@ -1715,10 +1693,8 @@ static void cnl_set_cdclk(struct drm_i915_private *dev_priv,
 	I915_WRITE(CDCLK_CTL, val);
 
 	/* inform PCU of the change */
-	mutex_lock(&dev_priv->pcu_lock);
 	sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
 				cdclk_state->voltage_level);
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	intel_update_cdclk(dev_priv);
 
@@ -1854,12 +1830,10 @@ static void icl_set_cdclk(struct drm_i915_private *dev_priv,
 	unsigned int vco = cdclk_state->vco;
 	int ret;
 
-	mutex_lock(&dev_priv->pcu_lock);
 	ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL,
 				SKL_CDCLK_PREPARE_FOR_CHANGE,
 				SKL_CDCLK_READY_FOR_CHANGE,
 				SKL_CDCLK_READY_FOR_CHANGE, 3);
-	mutex_unlock(&dev_priv->pcu_lock);
 	if (ret) {
 		DRM_ERROR("Failed to inform PCU about cdclk change (%d)\n",
 			  ret);
@@ -1876,10 +1850,8 @@ static void icl_set_cdclk(struct drm_i915_private *dev_priv,
 	I915_WRITE(CDCLK_CTL, ICL_CDCLK_CD2X_PIPE_NONE |
 			      skl_cdclk_decimal(cdclk));
 
-	mutex_lock(&dev_priv->pcu_lock);
 	/* TODO: add proper DVFS support. */
 	sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL, 2);
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	intel_update_cdclk(dev_priv);
 }
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 71124cdacd90..1007e589baa0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4980,10 +4980,8 @@ void hsw_enable_ips(const struct intel_crtc_state *crtc_state)
 	WARN_ON(!(crtc_state->active_planes & ~BIT(PLANE_CURSOR)));
 
 	if (IS_BROADWELL(dev_priv)) {
-		mutex_lock(&dev_priv->pcu_lock);
 		WARN_ON(sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL,
 						IPS_ENABLE | IPS_PCODE_CONTROL));
-		mutex_unlock(&dev_priv->pcu_lock);
 		/* Quoting Art Runyan: "its not safe to expect any particular
 		 * value in IPS_CTL bit 31 after enabling IPS through the
 		 * mailbox." Moreover, the mailbox may return a bogus state,
@@ -5013,9 +5011,7 @@ void hsw_disable_ips(const struct intel_crtc_state *crtc_state)
 		return;
 
 	if (IS_BROADWELL(dev_priv)) {
-		mutex_lock(&dev_priv->pcu_lock);
 		WARN_ON(sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL, 0));
-		mutex_unlock(&dev_priv->pcu_lock);
 		/* wait for pcode to finish disabling IPS, which may take up to 42ms */
 		if (intel_wait_for_register(dev_priv,
 					    IPS_CTL, IPS_ENABLE, 0,
@@ -8901,11 +8897,9 @@ static uint32_t hsw_read_dcomp(struct drm_i915_private *dev_priv)
 static void hsw_write_dcomp(struct drm_i915_private *dev_priv, uint32_t val)
 {
 	if (IS_HASWELL(dev_priv)) {
-		mutex_lock(&dev_priv->pcu_lock);
 		if (sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_D_COMP,
 					    val))
 			DRM_DEBUG_KMS("Failed to write to D_COMP\n");
-		mutex_unlock(&dev_priv->pcu_lock);
 	} else {
 		I915_WRITE(D_COMP_BDW, val);
 		POSTING_READ(D_COMP_BDW);
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 2db5da550a1c..6fa39d4521ca 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -105,10 +105,8 @@ static int intel_hdcp_load_keys(struct drm_i915_private *dev_priv)
 	 * differ in the key load trigger process from other platforms.
 	 */
 	if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
-		mutex_lock(&dev_priv->pcu_lock);
 		ret = sandybridge_pcode_write(dev_priv,
 					      SKL_PCODE_LOAD_HDCP_KEYS, 1);
-		mutex_unlock(&dev_priv->pcu_lock);
 		if (ret) {
 			DRM_ERROR("Failed to initiate HDCP key load (%d)\n",
 			          ret);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f3d88aa7330d..dda6fac09952 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -310,7 +310,6 @@ static void chv_set_memory_dvfs(struct drm_i915_private *dev_priv, bool enable)
 {
 	u32 val;
 
-	mutex_lock(&dev_priv->pcu_lock);
 	vlv_punit_get(dev_priv);
 
 	val = vlv_punit_read(dev_priv, PUNIT_REG_DDR_SETUP2);
@@ -327,14 +326,12 @@ static void chv_set_memory_dvfs(struct drm_i915_private *dev_priv, bool enable)
 		DRM_ERROR("timed out waiting for Punit DDR DVFS request\n");
 
 	vlv_punit_put(dev_priv);
-	mutex_unlock(&dev_priv->pcu_lock);
 }
 
 static void chv_set_memory_pm5(struct drm_i915_private *dev_priv, bool enable)
 {
 	u32 val;
 
-	mutex_lock(&dev_priv->pcu_lock);
 	vlv_punit_get(dev_priv);
 
 	val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
@@ -345,7 +342,6 @@ static void chv_set_memory_pm5(struct drm_i915_private *dev_priv, bool enable)
 	vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, val);
 
 	vlv_punit_put(dev_priv);
-	mutex_unlock(&dev_priv->pcu_lock);
 }
 
 #define FW_WM(value, plane) \
@@ -2810,11 +2806,9 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv,
 
 		/* read the first set of memory latencies[0:3] */
 		val = 0; /* data0 to be programmed to 0 for first set */
-		mutex_lock(&dev_priv->pcu_lock);
 		ret = sandybridge_pcode_read(dev_priv,
 					     GEN9_PCODE_READ_MEM_LATENCY,
 					     &val);
-		mutex_unlock(&dev_priv->pcu_lock);
 
 		if (ret) {
 			DRM_ERROR("SKL Mailbox read error = %d\n", ret);
@@ -2831,11 +2825,9 @@ static void intel_read_wm_latency(struct drm_i915_private *dev_priv,
 
 		/* read the second set of memory latencies[4:7] */
 		val = 1; /* data0 to be programmed to 1 for second set */
-		mutex_lock(&dev_priv->pcu_lock);
 		ret = sandybridge_pcode_read(dev_priv,
 					     GEN9_PCODE_READ_MEM_LATENCY,
 					     &val);
-		mutex_unlock(&dev_priv->pcu_lock);
 		if (ret) {
 			DRM_ERROR("SKL Mailbox read error = %d\n", ret);
 			return;
@@ -3639,13 +3631,10 @@ intel_enable_sagv(struct drm_i915_private *dev_priv)
 		return 0;
 
 	DRM_DEBUG_KMS("Enabling the SAGV\n");
-	mutex_lock(&dev_priv->pcu_lock);
-
 	ret = sandybridge_pcode_write(dev_priv, GEN9_PCODE_SAGV_CONTROL,
 				      GEN9_SAGV_ENABLE);
 
 	/* We don't need to wait for the SAGV when enabling */
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	/*
 	 * Some skl systems, pre-release machines in particular,
@@ -3676,15 +3665,11 @@ intel_disable_sagv(struct drm_i915_private *dev_priv)
 		return 0;
 
 	DRM_DEBUG_KMS("Disabling the SAGV\n");
-	mutex_lock(&dev_priv->pcu_lock);
-
 	/* bspec says to keep retrying for at least 1 ms */
 	ret = skl_pcode_request(dev_priv, GEN9_PCODE_SAGV_CONTROL,
 				GEN9_SAGV_DISABLE,
 				GEN9_SAGV_IS_DISABLED, GEN9_SAGV_IS_DISABLED,
 				1);
-	mutex_unlock(&dev_priv->pcu_lock);
-
 	/*
 	 * Some skl systems, pre-release machines in particular,
 	 * don't actually have an SAGV.
@@ -5861,7 +5846,6 @@ void vlv_wm_get_hw_state(struct drm_device *dev)
 	wm->level = VLV_WM_LEVEL_PM2;
 
 	if (IS_CHERRYVIEW(dev_priv)) {
-		mutex_lock(&dev_priv->pcu_lock);
 		vlv_punit_get(dev_priv);
 
 		val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
@@ -5893,7 +5877,6 @@ void vlv_wm_get_hw_state(struct drm_device *dev)
 		}
 
 		vlv_punit_put(dev_priv);
-		mutex_unlock(&dev_priv->pcu_lock);
 	}
 
 	for_each_intel_crtc(dev, crtc) {
@@ -6501,7 +6484,7 @@ void gen6_rps_busy(struct drm_i915_private *dev_priv)
 {
 	struct intel_rps *rps = &dev_priv->gt_pm.rps;
 
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&rps->lock);
 	if (rps->enabled) {
 		u8 freq;
 
@@ -6524,7 +6507,7 @@ void gen6_rps_busy(struct drm_i915_private *dev_priv)
 					rps->max_freq_softlimit)))
 			DRM_DEBUG_DRIVER("Failed to set idle frequency\n");
 	}
-	mutex_unlock(&dev_priv->pcu_lock);
+	mutex_unlock(&rps->lock);
 }
 
 void gen6_rps_idle(struct drm_i915_private *dev_priv)
@@ -6538,7 +6521,7 @@ void gen6_rps_idle(struct drm_i915_private *dev_priv)
 	 */
 	gen6_disable_rps_interrupts(dev_priv);
 
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&rps->lock);
 	if (rps->enabled) {
 		if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 			vlv_set_rps_idle(dev_priv);
@@ -6548,7 +6531,7 @@ void gen6_rps_idle(struct drm_i915_private *dev_priv)
 		I915_WRITE(GEN6_PMINTRMSK,
 			   gen6_sanitize_rps_pm_mask(dev_priv, ~0));
 	}
-	mutex_unlock(&dev_priv->pcu_lock);
+	mutex_unlock(&rps->lock);
 }
 
 void gen6_rps_boost(struct i915_request *rq,
@@ -6589,7 +6572,7 @@ int intel_set_rps(struct drm_i915_private *dev_priv, u8 val)
 	struct intel_rps *rps = &dev_priv->gt_pm.rps;
 	int err;
 
-	lockdep_assert_held(&dev_priv->pcu_lock);
+	lockdep_assert_held(&rps->lock);
 	GEM_BUG_ON(val > rps->max_freq);
 	GEM_BUG_ON(val < rps->min_freq);
 
@@ -7088,7 +7071,7 @@ static void gen6_update_ring_freq(struct drm_i915_private *dev_priv)
 	unsigned int max_gpu_freq, min_gpu_freq;
 	struct cpufreq_policy *policy;
 
-	WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
+	lockdep_assert_held(&rps->lock);
 
 	if (rps->max_freq <= rps->min_freq)
 		return;
@@ -8167,7 +8150,7 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 		intel_runtime_pm_get(dev_priv);
 	}
 
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&rps->lock);
 
 	/* Initialize RPS limits (for userspace) */
 	if (IS_CHERRYVIEW(dev_priv))
@@ -8207,7 +8190,7 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 	/* Finally allow us to boost to max by default */
 	rps->boost_freq = rps->max_freq;
 
-	mutex_unlock(&dev_priv->pcu_lock);
+	mutex_unlock(&rps->lock);
 }
 
 void intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv)
@@ -8249,7 +8232,7 @@ void intel_sanitize_gt_powersave(struct drm_i915_private *dev_priv)
 
 static inline void intel_disable_llc_pstate(struct drm_i915_private *i915)
 {
-	lockdep_assert_held(&i915->pcu_lock);
+	lockdep_assert_held(&i915->gt_pm.rps.lock);
 
 	if (!i915->gt_pm.llc_pstate.enabled)
 		return;
@@ -8261,7 +8244,7 @@ static inline void intel_disable_llc_pstate(struct drm_i915_private *i915)
 
 static void intel_disable_rc6(struct drm_i915_private *dev_priv)
 {
-	lockdep_assert_held(&dev_priv->pcu_lock);
+	lockdep_assert_held(&dev_priv->gt_pm.rps.lock);
 
 	if (!dev_priv->gt_pm.rc6.enabled)
 		return;
@@ -8280,7 +8263,7 @@ static void intel_disable_rc6(struct drm_i915_private *dev_priv)
 
 static void intel_disable_rps(struct drm_i915_private *dev_priv)
 {
-	lockdep_assert_held(&dev_priv->pcu_lock);
+	lockdep_assert_held(&dev_priv->gt_pm.rps.lock);
 
 	if (!dev_priv->gt_pm.rps.enabled)
 		return;
@@ -8301,19 +8284,19 @@ static void intel_disable_rps(struct drm_i915_private *dev_priv)
 
 void intel_disable_gt_powersave(struct drm_i915_private *dev_priv)
 {
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&dev_priv->gt_pm.rps.lock);
 
 	intel_disable_rc6(dev_priv);
 	intel_disable_rps(dev_priv);
 	if (HAS_LLC(dev_priv))
 		intel_disable_llc_pstate(dev_priv);
 
-	mutex_unlock(&dev_priv->pcu_lock);
+	mutex_unlock(&dev_priv->gt_pm.rps.lock);
 }
 
 static inline void intel_enable_llc_pstate(struct drm_i915_private *i915)
 {
-	lockdep_assert_held(&i915->pcu_lock);
+	lockdep_assert_held(&i915->gt_pm.rps.lock);
 
 	if (i915->gt_pm.llc_pstate.enabled)
 		return;
@@ -8325,7 +8308,7 @@ static inline void intel_enable_llc_pstate(struct drm_i915_private *i915)
 
 static void intel_enable_rc6(struct drm_i915_private *dev_priv)
 {
-	lockdep_assert_held(&dev_priv->pcu_lock);
+	lockdep_assert_held(&dev_priv->gt_pm.rps.lock);
 
 	if (dev_priv->gt_pm.rc6.enabled)
 		return;
@@ -8348,7 +8331,7 @@ static void intel_enable_rps(struct drm_i915_private *dev_priv)
 {
 	struct intel_rps *rps = &dev_priv->gt_pm.rps;
 
-	lockdep_assert_held(&dev_priv->pcu_lock);
+	lockdep_assert_held(&rps->lock);
 
 	if (rps->enabled)
 		return;
@@ -8383,7 +8366,7 @@ void intel_enable_gt_powersave(struct drm_i915_private *dev_priv)
 	if (intel_vgpu_active(dev_priv))
 		return;
 
-	mutex_lock(&dev_priv->pcu_lock);
+	mutex_lock(&dev_priv->gt_pm.rps.lock);
 
 	if (HAS_RC6(dev_priv))
 		intel_enable_rc6(dev_priv);
@@ -8391,7 +8374,7 @@ void intel_enable_gt_powersave(struct drm_i915_private *dev_priv)
 	if (HAS_LLC(dev_priv))
 		intel_enable_llc_pstate(dev_priv);
 
-	mutex_unlock(&dev_priv->pcu_lock);
+	mutex_unlock(&dev_priv->gt_pm.rps.lock);
 }
 
 static void ibx_init_clock_gating(struct drm_i915_private *dev_priv)
@@ -9396,22 +9379,19 @@ static inline int gen7_check_mailbox_status(struct drm_i915_private *dev_priv)
 	}
 }
 
-int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u32 mbox, u32 *val)
+static int __sandybridge_pcode_read(struct drm_i915_private *dev_priv, u32 mbox, u32 *val)
 {
 	int status;
 
-	WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
+	lockdep_assert_held(&dev_priv->sb_lock);
 
 	/* GEN6_PCODE_* are outside of the forcewake domain, we can
 	 * use te fw I915_READ variants to reduce the amount of work
 	 * required when reading/writing.
 	 */
 
-	if (I915_READ_FW(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) {
-		DRM_DEBUG_DRIVER("warning: pcode (read from mbox %x) mailbox access failed for %ps\n",
-				 mbox, __builtin_return_address(0));
+	if (I915_READ_FW(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY)
 		return -EAGAIN;
-	}
 
 	I915_WRITE_FW(GEN6_PCODE_DATA, *val);
 	I915_WRITE_FW(GEN6_PCODE_DATA1, 0);
@@ -9419,11 +9399,8 @@ int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u32 mbox, u32 *val
 
 	if (__intel_wait_for_register_fw(dev_priv,
 					 GEN6_PCODE_MAILBOX, GEN6_PCODE_READY, 0,
-					 500, 0, NULL)) {
-		DRM_ERROR("timeout waiting for pcode read (from mbox %x) to finish for %ps\n",
-			  mbox, __builtin_return_address(0));
+					 500, 0, NULL))
 		return -ETIMEDOUT;
-	}
 
 	*val = I915_READ_FW(GEN6_PCODE_DATA);
 	I915_WRITE_FW(GEN6_PCODE_DATA, 0);
@@ -9433,33 +9410,39 @@ int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u32 mbox, u32 *val
 	else
 		status = gen6_check_mailbox_status(dev_priv);
 
+	return status;
+}
+
+int sandybridge_pcode_read(struct drm_i915_private *dev_priv, u32 mbox, u32 *val)
+{
+	int status;
+
+	mutex_lock(&dev_priv->sb_lock);
+	status = __sandybridge_pcode_read(dev_priv, mbox, val);
+	mutex_unlock(&dev_priv->sb_lock);
+
 	if (status) {
 		DRM_DEBUG_DRIVER("warning: pcode (read from mbox %x) mailbox access failed for %ps: %d\n",
 				 mbox, __builtin_return_address(0), status);
-		return status;
 	}
 
-	return 0;
+	return status;
 }
 
-int sandybridge_pcode_write_timeout(struct drm_i915_private *dev_priv,
-				    u32 mbox, u32 val,
-				    int fast_timeout_us, int slow_timeout_ms)
+static int __sandybridge_pcode_write_timeout(struct drm_i915_private *dev_priv,
+					     u32 mbox, u32 val,
+					     int fast_timeout_us,
+					     int slow_timeout_ms)
 {
 	int status;
 
-	WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
-
 	/* GEN6_PCODE_* are outside of the forcewake domain, we can
 	 * use te fw I915_READ variants to reduce the amount of work
 	 * required when reading/writing.
 	 */
 
-	if (I915_READ_FW(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) {
-		DRM_DEBUG_DRIVER("warning: pcode (write of 0x%08x to mbox %x) mailbox access failed for %ps\n",
-				 val, mbox, __builtin_return_address(0));
+	if (I915_READ_FW(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY)
 		return -EAGAIN;
-	}
 
 	I915_WRITE_FW(GEN6_PCODE_DATA, val);
 	I915_WRITE_FW(GEN6_PCODE_DATA1, 0);
@@ -9468,11 +9451,8 @@ int sandybridge_pcode_write_timeout(struct drm_i915_private *dev_priv,
 	if (__intel_wait_for_register_fw(dev_priv,
 					 GEN6_PCODE_MAILBOX, GEN6_PCODE_READY, 0,
 					 fast_timeout_us, slow_timeout_ms,
-					 NULL)) {
-		DRM_ERROR("timeout waiting for pcode write of 0x%08x to mbox %x to finish for %ps\n",
-			  val, mbox, __builtin_return_address(0));
+					 NULL))
 		return -ETIMEDOUT;
-	}
 
 	I915_WRITE_FW(GEN6_PCODE_DATA, 0);
 
@@ -9481,13 +9461,28 @@ int sandybridge_pcode_write_timeout(struct drm_i915_private *dev_priv,
 	else
 		status = gen6_check_mailbox_status(dev_priv);
 
+	return status;
+}
+
+int sandybridge_pcode_write_timeout(struct drm_i915_private *dev_priv,
+				    u32 mbox, u32 val,
+				    int fast_timeout_us,
+				    int slow_timeout_ms)
+{
+	int status;
+
+	mutex_lock(&dev_priv->sb_lock);
+	status = __sandybridge_pcode_write_timeout(dev_priv, mbox, val,
+						   fast_timeout_us,
+						   slow_timeout_ms);
+	mutex_unlock(&dev_priv->sb_lock);
+
 	if (status) {
 		DRM_DEBUG_DRIVER("warning: pcode (write of 0x%08x to mbox %x) mailbox access failed for %ps: %d\n",
 				 val, mbox, __builtin_return_address(0), status);
-		return status;
 	}
 
-	return 0;
+	return status;
 }
 
 static bool skl_pcode_try_request(struct drm_i915_private *dev_priv, u32 mbox,
@@ -9496,7 +9491,7 @@ static bool skl_pcode_try_request(struct drm_i915_private *dev_priv, u32 mbox,
 {
 	u32 val = request;
 
-	*status = sandybridge_pcode_read(dev_priv, mbox, &val);
+	*status = __sandybridge_pcode_read(dev_priv, mbox, &val);
 
 	return *status || ((val & reply_mask) == reply);
 }
@@ -9526,7 +9521,7 @@ int skl_pcode_request(struct drm_i915_private *dev_priv, u32 mbox, u32 request,
 	u32 status;
 	int ret;
 
-	WARN_ON(!mutex_is_locked(&dev_priv->pcu_lock));
+	mutex_lock(&dev_priv->sb_lock);
 
 #define COND skl_pcode_try_request(dev_priv, mbox, request, reply_mask, reply, \
 				   &status)
@@ -9562,6 +9557,7 @@ int skl_pcode_request(struct drm_i915_private *dev_priv, u32 mbox, u32 request,
 	preempt_enable();
 
 out:
+	mutex_unlock(&dev_priv->sb_lock);
 	return ret ? ret : status;
 #undef COND
 }
@@ -9631,8 +9627,7 @@ int intel_freq_opcode(struct drm_i915_private *dev_priv, int val)
 
 void intel_pm_setup(struct drm_i915_private *dev_priv)
 {
-	mutex_init(&dev_priv->pcu_lock);
-
+	mutex_init(&dev_priv->gt_pm.rps.lock);
 	atomic_set(&dev_priv->gt_pm.rps.num_waiters, 0);
 
 	dev_priv->runtime_pm.suspended = false;
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index a7efb4113084..8b92be53b5dc 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -807,7 +807,6 @@ static void vlv_set_power_well(struct drm_i915_private *dev_priv,
 	state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) :
 			 PUNIT_PWRGT_PWR_GATE(power_well_id);
 
-	mutex_lock(&dev_priv->pcu_lock);
 	vlv_punit_get(dev_priv);
 
 #define COND \
@@ -830,7 +829,6 @@ static void vlv_set_power_well(struct drm_i915_private *dev_priv,
 
 out:
 	vlv_punit_put(dev_priv);
-	mutex_unlock(&dev_priv->pcu_lock);
 }
 
 static void vlv_power_well_enable(struct drm_i915_private *dev_priv,
@@ -857,7 +855,6 @@ static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
 	mask = PUNIT_PWRGT_MASK(power_well_id);
 	ctrl = PUNIT_PWRGT_PWR_ON(power_well_id);
 
-	mutex_lock(&dev_priv->pcu_lock);
 	vlv_punit_get(dev_priv);
 
 	state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask;
@@ -878,7 +875,6 @@ static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv,
 	WARN_ON(ctrl != state);
 
 	vlv_punit_put(dev_priv);
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	return enabled;
 }
@@ -1390,7 +1386,6 @@ static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
 	bool enabled;
 	u32 state, ctrl;
 
-	mutex_lock(&dev_priv->pcu_lock);
 	vlv_punit_get(dev_priv);
 
 	state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe);
@@ -1409,7 +1404,6 @@ static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv,
 	WARN_ON(ctrl << 16 != state);
 
 	vlv_punit_put(dev_priv);
-	mutex_unlock(&dev_priv->pcu_lock);
 
 	return enabled;
 }
@@ -1424,7 +1418,6 @@ static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
 
 	state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe);
 
-	mutex_lock(&dev_priv->pcu_lock);
 	vlv_punit_get(dev_priv);
 
 #define COND \
@@ -1447,7 +1440,6 @@ static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv,
 
 out:
 	vlv_punit_put(dev_priv);
-	mutex_unlock(&dev_priv->pcu_lock);
 }
 
 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
index dc3b491b4d00..2d4e48e9e1d5 100644
--- a/drivers/gpu/drm/i915/intel_sideband.c
+++ b/drivers/gpu/drm/i915/intel_sideband.c
@@ -142,8 +142,6 @@ u32 vlv_punit_read(struct drm_i915_private *dev_priv, u32 addr)
 {
 	u32 val = 0;
 
-	lockdep_assert_held(&dev_priv->pcu_lock);
-
 	vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
 			SB_CRRDDA_NP, addr, &val);
 
@@ -152,8 +150,6 @@ u32 vlv_punit_read(struct drm_i915_private *dev_priv, u32 addr)
 
 int vlv_punit_write(struct drm_i915_private *dev_priv, u32 addr, u32 val)
 {
-	lockdep_assert_held(&dev_priv->pcu_lock);
-
 	return vlv_sideband_rw(dev_priv, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
 			       SB_CRWRDA_NP, addr, &val);
 }
-- 
2.17.0

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