--- /dev/null
+/*
+ * POWERNV cpufreq driver for the IBM POWER processors
+ *
+ * (C) Copyright IBM 2014
+ *
+ * Author: Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#define pr_fmt(fmt) "powernv-cpufreq: " fmt
+
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/cpumask.h>
+#include <linux/module.h>
+#include <linux/cpufreq.h>
+#include <linux/smp.h>
+#include <linux/of.h>
+#include <linux/reboot.h>
+
+#include <asm/cputhreads.h>
+#include <asm/firmware.h>
+#include <asm/reg.h>
+#include <asm/smp.h> /* Required for cpu_sibling_mask() in UP configs */
+
+#define POWERNV_MAX_PSTATES 256
+#define PMSR_PSAFE_ENABLE (1UL << 30)
+#define PMSR_SPR_EM_DISABLE (1UL << 31)
+#define PMSR_MAX(x) ((x >> 32) & 0xFF)
+#define PMSR_LP(x) ((x >> 48) & 0xFF)
+
+static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1];
+static bool rebooting, throttled;
+
+/*
+ * Note: The set of pstates consists of contiguous integers, the
+ * smallest of which is indicated by powernv_pstate_info.min, the
+ * largest of which is indicated by powernv_pstate_info.max.
+ *
+ * The nominal pstate is the highest non-turbo pstate in this
+ * platform. This is indicated by powernv_pstate_info.nominal.
+ */
+static struct powernv_pstate_info {
+ int min;
+ int max;
+ int nominal;
+ int nr_pstates;
+} powernv_pstate_info;
+
+/*
+ * Initialize the freq table based on data obtained
+ * from the firmware passed via device-tree
+ */
+static int init_powernv_pstates(void)
+{
+ struct device_node *power_mgt;
+ int i, pstate_min, pstate_max, pstate_nominal, nr_pstates = 0;
+ const __be32 *pstate_ids, *pstate_freqs;
+ u32 len_ids, len_freqs;
+
+ power_mgt = of_find_node_by_path("/ibm,opal/power-mgt");
+ if (!power_mgt) {
+ pr_warn("power-mgt node not found\n");
+ return -ENODEV;
+ }
+
+ if (of_property_read_u32(power_mgt, "ibm,pstate-min", &pstate_min)) {
+ pr_warn("ibm,pstate-min node not found\n");
+ return -ENODEV;
+ }
+
+ if (of_property_read_u32(power_mgt, "ibm,pstate-max", &pstate_max)) {
+ pr_warn("ibm,pstate-max node not found\n");
+ return -ENODEV;
+ }
+
+ if (of_property_read_u32(power_mgt, "ibm,pstate-nominal",
+ &pstate_nominal)) {
+ pr_warn("ibm,pstate-nominal not found\n");
+ return -ENODEV;
+ }
+ pr_info("cpufreq pstate min %d nominal %d max %d\n", pstate_min,
+ pstate_nominal, pstate_max);
+
+ pstate_ids = of_get_property(power_mgt, "ibm,pstate-ids", &len_ids);
+ if (!pstate_ids) {
+ pr_warn("ibm,pstate-ids not found\n");
+ return -ENODEV;
+ }
+
+ pstate_freqs = of_get_property(power_mgt, "ibm,pstate-frequencies-mhz",
+ &len_freqs);
+ if (!pstate_freqs) {
+ pr_warn("ibm,pstate-frequencies-mhz not found\n");
+ return -ENODEV;
+ }
+
+ if (len_ids != len_freqs) {
+ pr_warn("Entries in ibm,pstate-ids and "
+ "ibm,pstate-frequencies-mhz does not match\n");
+ }
+
+ nr_pstates = min(len_ids, len_freqs) / sizeof(u32);
+ if (!nr_pstates) {
+ pr_warn("No PStates found\n");
+ return -ENODEV;
+ }
+
+ pr_debug("NR PStates %d\n", nr_pstates);
+ for (i = 0; i < nr_pstates; i++) {
+ u32 id = be32_to_cpu(pstate_ids[i]);
+ u32 freq = be32_to_cpu(pstate_freqs[i]);
+
+ pr_debug("PState id %d freq %d MHz\n", id, freq);
+ powernv_freqs[i].frequency = freq * 1000; /* kHz */
+ powernv_freqs[i].driver_data = id;
+ }
+ /* End of list marker entry */
+ powernv_freqs[i].frequency = CPUFREQ_TABLE_END;
+
+ powernv_pstate_info.min = pstate_min;
+ powernv_pstate_info.max = pstate_max;
+ powernv_pstate_info.nominal = pstate_nominal;
+ powernv_pstate_info.nr_pstates = nr_pstates;
+
+ return 0;
+}
+
+/* Returns the CPU frequency corresponding to the pstate_id. */
+static unsigned int pstate_id_to_freq(int pstate_id)
+{
+ int i;
+
+ i = powernv_pstate_info.max - pstate_id;
+ if (i >= powernv_pstate_info.nr_pstates || i < 0) {
+ pr_warn("PState id %d outside of PState table, "
+ "reporting nominal id %d instead\n",
+ pstate_id, powernv_pstate_info.nominal);
+ i = powernv_pstate_info.max - powernv_pstate_info.nominal;
+ }
+
+ return powernv_freqs[i].frequency;
+}
+
+/*
+ * cpuinfo_nominal_freq_show - Show the nominal CPU frequency as indicated by
+ * the firmware
+ */
+static ssize_t cpuinfo_nominal_freq_show(struct cpufreq_policy *policy,
+ char *buf)
+{
+ return sprintf(buf, "%u\n",
+ pstate_id_to_freq(powernv_pstate_info.nominal));
+}
+
+struct freq_attr cpufreq_freq_attr_cpuinfo_nominal_freq =
+ __ATTR_RO(cpuinfo_nominal_freq);
+
+static struct freq_attr *powernv_cpu_freq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ &cpufreq_freq_attr_cpuinfo_nominal_freq,
+ NULL,
+};
+
+/* Helper routines */
+
+/* Access helpers to power mgt SPR */
+
+static inline unsigned long get_pmspr(unsigned long sprn)
+{
+ switch (sprn) {
+ case SPRN_PMCR:
+ return mfspr(SPRN_PMCR);
+
+ case SPRN_PMICR:
+ return mfspr(SPRN_PMICR);
+
+ case SPRN_PMSR:
+ return mfspr(SPRN_PMSR);
+ }
+ BUG();
+}
+
+static inline void set_pmspr(unsigned long sprn, unsigned long val)
+{
+ switch (sprn) {
+ case SPRN_PMCR:
+ mtspr(SPRN_PMCR, val);
+ return;
+
+ case SPRN_PMICR:
+ mtspr(SPRN_PMICR, val);
+ return;
+ }
+ BUG();
+}
+
+/*
+ * Use objects of this type to query/update
+ * pstates on a remote CPU via smp_call_function.
+ */
+struct powernv_smp_call_data {
+ unsigned int freq;
+ int pstate_id;
+};
+
+/*
+ * powernv_read_cpu_freq: Reads the current frequency on this CPU.
+ *
+ * Called via smp_call_function.
+ *
+ * Note: The caller of the smp_call_function should pass an argument of
+ * the type 'struct powernv_smp_call_data *' along with this function.
+ *
+ * The current frequency on this CPU will be returned via
+ * ((struct powernv_smp_call_data *)arg)->freq;
+ */
+static void powernv_read_cpu_freq(void *arg)
+{
+ unsigned long pmspr_val;
+ s8 local_pstate_id;
+ struct powernv_smp_call_data *freq_data = arg;
+
+ pmspr_val = get_pmspr(SPRN_PMSR);
+
+ /*
+ * The local pstate id corresponds bits 48..55 in the PMSR.
+ * Note: Watch out for the sign!
+ */
+ local_pstate_id = (pmspr_val >> 48) & 0xFF;
+ freq_data->pstate_id = local_pstate_id;
+ freq_data->freq = pstate_id_to_freq(freq_data->pstate_id);
+
+ pr_debug("cpu %d pmsr %016lX pstate_id %d frequency %d kHz\n",
+ raw_smp_processor_id(), pmspr_val, freq_data->pstate_id,
+ freq_data->freq);
+}
+
+/*
+ * powernv_cpufreq_get: Returns the CPU frequency as reported by the
+ * firmware for CPU 'cpu'. This value is reported through the sysfs
+ * file cpuinfo_cur_freq.
+ */
+static unsigned int powernv_cpufreq_get(unsigned int cpu)
+{
+ struct powernv_smp_call_data freq_data;
+
+ smp_call_function_any(cpu_sibling_mask(cpu), powernv_read_cpu_freq,
+ &freq_data, 1);
+
+ return freq_data.freq;
+}
+
+/*
+ * set_pstate: Sets the pstate on this CPU.
+ *
+ * This is called via an smp_call_function.
+ *
+ * The caller must ensure that freq_data is of the type
+ * (struct powernv_smp_call_data *) and the pstate_id which needs to be set
+ * on this CPU should be present in freq_data->pstate_id.
+ */
+static void set_pstate(void *freq_data)
+{
+ unsigned long val;
+ unsigned long pstate_ul =
+ ((struct powernv_smp_call_data *) freq_data)->pstate_id;
+
+ val = get_pmspr(SPRN_PMCR);
+ val = val & 0x0000FFFFFFFFFFFFULL;
+
+ pstate_ul = pstate_ul & 0xFF;
+
+ /* Set both global(bits 56..63) and local(bits 48..55) PStates */
+ val = val | (pstate_ul << 56) | (pstate_ul << 48);
+
+ pr_debug("Setting cpu %d pmcr to %016lX\n",
+ raw_smp_processor_id(), val);
+ set_pmspr(SPRN_PMCR, val);
+}
+
+/*
+ * get_nominal_index: Returns the index corresponding to the nominal
+ * pstate in the cpufreq table
+ */
+static inline unsigned int get_nominal_index(void)
+{
+ return powernv_pstate_info.max - powernv_pstate_info.nominal;
+}
+
+static void powernv_cpufreq_throttle_check(unsigned int cpu)
+{
+ unsigned long pmsr;
+ int pmsr_pmax, pmsr_lp;
+
+ pmsr = get_pmspr(SPRN_PMSR);
+
+ /* Check for Pmax Capping */
+ pmsr_pmax = (s8)PMSR_MAX(pmsr);
+ if (pmsr_pmax != powernv_pstate_info.max) {
+ throttled = true;
+ pr_info("CPU %d Pmax is reduced to %d\n", cpu, pmsr_pmax);
+ pr_info("Max allowed Pstate is capped\n");
+ }
+
+ /*
+ * Check for Psafe by reading LocalPstate
+ * or check if Psafe_mode_active is set in PMSR.
+ */
+ pmsr_lp = (s8)PMSR_LP(pmsr);
+ if ((pmsr_lp < powernv_pstate_info.min) ||
+ (pmsr & PMSR_PSAFE_ENABLE)) {
+ throttled = true;
+ pr_info("Pstate set to safe frequency\n");
+ }
+
+ /* Check if SPR_EM_DISABLE is set in PMSR */
+ if (pmsr & PMSR_SPR_EM_DISABLE) {
+ throttled = true;
+ pr_info("Frequency Control disabled from OS\n");
+ }
+
+ if (throttled) {
+ pr_info("PMSR = %16lx\n", pmsr);
+ pr_crit("CPU Frequency could be throttled\n");
+ }
+}
+
+/*
+ * powernv_cpufreq_target_index: Sets the frequency corresponding to
+ * the cpufreq table entry indexed by new_index on the cpus in the
+ * mask policy->cpus
+ */
+static int powernv_cpufreq_target_index(struct cpufreq_policy *policy,
+ unsigned int new_index)
+{
+ struct powernv_smp_call_data freq_data;
+
+ if (unlikely(rebooting) && new_index != get_nominal_index())
+ return 0;
+
+ if (!throttled)
+ powernv_cpufreq_throttle_check(smp_processor_id());
+
+ freq_data.pstate_id = powernv_freqs[new_index].driver_data;
+
+ /*
+ * Use smp_call_function to send IPI and execute the
+ * mtspr on target CPU. We could do that without IPI
+ * if current CPU is within policy->cpus (core)
+ */
+ smp_call_function_any(policy->cpus, set_pstate, &freq_data, 1);
+
+ return 0;
+}
+
+static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+ int base, i;
+
+ base = cpu_first_thread_sibling(policy->cpu);
+
+ for (i = 0; i < threads_per_core; i++)
+ cpumask_set_cpu(base + i, policy->cpus);
+
+ return cpufreq_table_validate_and_show(policy, powernv_freqs);
+}
+
+static int powernv_cpufreq_reboot_notifier(struct notifier_block *nb,
+ unsigned long action, void *unused)
+{
+ int cpu;
+ struct cpufreq_policy cpu_policy;
+
+ rebooting = true;
+ for_each_online_cpu(cpu) {
+ cpufreq_get_policy(&cpu_policy, cpu);
+ powernv_cpufreq_target_index(&cpu_policy, get_nominal_index());
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block powernv_cpufreq_reboot_nb = {
+ .notifier_call = powernv_cpufreq_reboot_notifier,
+};
+
+static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy)
+{
+ struct powernv_smp_call_data freq_data;
+
+ freq_data.pstate_id = powernv_pstate_info.min;
+ smp_call_function_single(policy->cpu, set_pstate, &freq_data, 1);
+}
+
+static struct cpufreq_driver powernv_cpufreq_driver = {
+ .name = "powernv-cpufreq",
+ .flags = CPUFREQ_CONST_LOOPS,
+ .init = powernv_cpufreq_cpu_init,
+ .verify = cpufreq_generic_frequency_table_verify,
+ .target_index = powernv_cpufreq_target_index,
+ .get = powernv_cpufreq_get,
+ .stop_cpu = powernv_cpufreq_stop_cpu,
+ .attr = powernv_cpu_freq_attr,
+};
+
+static int __init powernv_cpufreq_init(void)
+{
+ int rc = 0;
+
+ /* Don't probe on pseries (guest) platforms */
+ if (!firmware_has_feature(FW_FEATURE_OPALv3))
+ return -ENODEV;
+
+ /* Discover pstates from device tree and init */
+ rc = init_powernv_pstates();
+ if (rc) {
+ pr_info("powernv-cpufreq disabled. System does not support PState control\n");
+ return rc;
+ }
+
+ register_reboot_notifier(&powernv_cpufreq_reboot_nb);
+ return cpufreq_register_driver(&powernv_cpufreq_driver);
+}
+module_init(powernv_cpufreq_init);
+
+static void __exit powernv_cpufreq_exit(void)
+{
+ unregister_reboot_notifier(&powernv_cpufreq_reboot_nb);
+ cpufreq_unregister_driver(&powernv_cpufreq_driver);
+}
+module_exit(powernv_cpufreq_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>");
Code Review / kvmfornfv.git / blobdiff