linux-kernel - [PATCH] cpufreq: powernv: Add boost files to export ultra-turbo frequencies

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Message-Id: <1481886788-25324-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com>
Date:   Fri, 16 Dec 2016 16:43:08 +0530
From:   Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
To:     rjw@...ysocki.net, viresh.kumar@...aro.org
Cc:     ego@...ux.vnet.ibm.com, akshay.adiga@...ux.vnet.ibm.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, svaidy@...ux.vnet.ibm.com,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH] cpufreq: powernv: Add boost files to export ultra-turbo frequencies

In P8+, Workload Optimized Frequency(WOF) provides the capability to
boost the cpu frequency based on the utilization of the other cpus
running in the chip. The On-Chip-Controller(OCC) firmware will control
the achievability of these frequencies depending on the power headroom
available in the chip. Currently the ultra-turbo frequencies provided
by this feature are exported along with the turbo and sub-turbo
frequencies as scaling_available_frequencies. This patch will export
the ultra-turbo frequencies separately as scaling_boost_frequencies in
WOF enabled systems. This patch will add the boost sysfs file which
can be used to disable/enable ultra-turbo frequencies.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
---
 drivers/cpufreq/powernv-cpufreq.c | 48 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 45 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 37671b5..56dfd91 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -144,6 +144,7 @@ enum throttle_reason_type {
 	unsigned int max;
 	unsigned int nominal;
 	unsigned int nr_pstates;
+	bool wof_enabled;
 } powernv_pstate_info;
 
 /* Use following macros for conversions between pstate_id and index */
@@ -203,6 +204,7 @@ static int init_powernv_pstates(void)
 	const __be32 *pstate_ids, *pstate_freqs;
 	u32 len_ids, len_freqs;
 	u32 pstate_min, pstate_max, pstate_nominal;
+	u32 pstate_turbo, pstate_ultra_turbo;
 
 	power_mgt = of_find_node_by_path("/ibm,opal/power-mgt");
 	if (!power_mgt) {
@@ -225,6 +227,25 @@ static int init_powernv_pstates(void)
 		pr_warn("ibm,pstate-nominal not found\n");
 		return -ENODEV;
 	}
+
+	if (of_property_read_u32(power_mgt, "ibm,pstate-ultra-turbo",
+				 &pstate_ultra_turbo)) {
+		powernv_pstate_info.wof_enabled = false;
+		goto next;
+	}
+
+	if (of_property_read_u32(power_mgt, "ibm,pstate-turbo",
+				 &pstate_turbo)) {
+		powernv_pstate_info.wof_enabled = false;
+		goto next;
+	}
+
+	if (pstate_turbo == pstate_ultra_turbo)
+		powernv_pstate_info.wof_enabled = false;
+	else
+		powernv_pstate_info.wof_enabled = true;
+
+next:
 	pr_info("cpufreq pstate min %d nominal %d max %d\n", pstate_min,
 		pstate_nominal, pstate_max);
 
@@ -268,6 +289,13 @@ static int init_powernv_pstates(void)
 			powernv_pstate_info.nominal = i;
 		else if (id == pstate_min)
 			powernv_pstate_info.min = i;
+
+		if (powernv_pstate_info.wof_enabled && id == pstate_turbo) {
+			int j;
+
+			for (j = i - 1; j >= (int)powernv_pstate_info.max; j--)
+				powernv_freqs[j].flags = CPUFREQ_BOOST_FREQ;
+		}
 	}
 
 	/* End of list marker entry */
@@ -305,9 +333,12 @@ static ssize_t cpuinfo_nominal_freq_show(struct cpufreq_policy *policy,
 struct freq_attr cpufreq_freq_attr_cpuinfo_nominal_freq =
 	__ATTR_RO(cpuinfo_nominal_freq);
 
+#define SCALING_BOOST_FREQS_ATTR_INDEX		2
+
 static struct freq_attr *powernv_cpu_freq_attr[] = {
 	&cpufreq_freq_attr_scaling_available_freqs,
 	&cpufreq_freq_attr_cpuinfo_nominal_freq,
+	&cpufreq_freq_attr_scaling_boost_freqs,
 	NULL,
 };
 
@@ -1013,11 +1044,22 @@ static int __init powernv_cpufreq_init(void)
 	register_reboot_notifier(&powernv_cpufreq_reboot_nb);
 	opal_message_notifier_register(OPAL_MSG_OCC, &powernv_cpufreq_opal_nb);
 
+	if (powernv_pstate_info.wof_enabled)
+		powernv_cpufreq_driver.boost_enabled = true;
+	else
+		powernv_cpu_freq_attr[SCALING_BOOST_FREQS_ATTR_INDEX] = NULL;
+
 	rc = cpufreq_register_driver(&powernv_cpufreq_driver);
-	if (!rc)
-		return 0;
+	if (rc) {
+		pr_info("Failed to register the cpufreq driver (%d)\n", rc);
+		goto clean_notifiers;
+	}
 
-	pr_info("Failed to register the cpufreq driver (%d)\n", rc);
+	if (powernv_pstate_info.wof_enabled)
+		cpufreq_enable_boost_support();
+
+	return 0;
+clean_notifiers:
 	unregister_all_notifiers();
 	clean_chip_info();
 out:
-- 
1.8.3.1