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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9c0ebcf78f
Currently, the prototype of cpufreq_drivers target routines is: int target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation); And most of the drivers call cpufreq_frequency_table_target() to get a valid index of their frequency table which is closest to the target_freq. And they don't use target_freq and relation after that. So, it makes sense to just do this work in cpufreq core before calling cpufreq_frequency_table_target() and simply pass index instead. But this can be done only with drivers which expose their frequency table with cpufreq core. For others we need to stick with the old prototype of target() until those drivers are converted to expose frequency tables. This patch implements the new light weight prototype for target_index() routine. It looks like this: int target_index(struct cpufreq_policy *policy, unsigned int index); CPUFreq core will call cpufreq_frequency_table_target() before calling this routine and pass index to it. Because CPUFreq core now requires to call routines present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time. This also marks target() interface as deprecated. So, that new drivers avoid using it. And Documentation is updated accordingly. It also converts existing .target() to newly defined light weight .target_index() routine for many driver. Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Russell King <linux@arm.linux.org.uk> Acked-by: David S. Miller <davem@davemloft.net> Tested-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>
214 lines
5.5 KiB
C
214 lines
5.5 KiB
C
/*
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* This file was based upon code in Powertweak Linux (http://powertweak.sf.net)
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* (C) 2000-2003 Dave Jones, Arjan van de Ven, Janne Pänkälä,
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* Dominik Brodowski.
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*
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* Licensed under the terms of the GNU GPL License version 2.
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*
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* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#include <linux/ioport.h>
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#include <linux/timex.h>
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#include <linux/io.h>
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#include <asm/cpu_device_id.h>
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#include <asm/msr.h>
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#define POWERNOW_IOPORT 0xfff0 /* it doesn't matter where, as long
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as it is unused */
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#define PFX "powernow-k6: "
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static unsigned int busfreq; /* FSB, in 10 kHz */
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static unsigned int max_multiplier;
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/* Clock ratio multiplied by 10 - see table 27 in AMD#23446 */
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static struct cpufreq_frequency_table clock_ratio[] = {
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{45, /* 000 -> 4.5x */ 0},
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{50, /* 001 -> 5.0x */ 0},
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{40, /* 010 -> 4.0x */ 0},
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{55, /* 011 -> 5.5x */ 0},
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{20, /* 100 -> 2.0x */ 0},
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{30, /* 101 -> 3.0x */ 0},
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{60, /* 110 -> 6.0x */ 0},
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{35, /* 111 -> 3.5x */ 0},
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{0, CPUFREQ_TABLE_END}
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};
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/**
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* powernow_k6_get_cpu_multiplier - returns the current FSB multiplier
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*
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* Returns the current setting of the frequency multiplier. Core clock
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* speed is frequency of the Front-Side Bus multiplied with this value.
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*/
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static int powernow_k6_get_cpu_multiplier(void)
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{
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u64 invalue = 0;
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u32 msrval;
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msrval = POWERNOW_IOPORT + 0x1;
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wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
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invalue = inl(POWERNOW_IOPORT + 0x8);
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msrval = POWERNOW_IOPORT + 0x0;
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wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
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return clock_ratio[(invalue >> 5)&7].driver_data;
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}
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/**
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* powernow_k6_target - set the PowerNow! multiplier
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* @best_i: clock_ratio[best_i] is the target multiplier
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*
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* Tries to change the PowerNow! multiplier
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*/
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static int powernow_k6_target(struct cpufreq_policy *policy,
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unsigned int best_i)
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{
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unsigned long outvalue = 0, invalue = 0;
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unsigned long msrval;
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struct cpufreq_freqs freqs;
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if (clock_ratio[best_i].driver_data > max_multiplier) {
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printk(KERN_ERR PFX "invalid target frequency\n");
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return -EINVAL;
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}
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freqs.old = busfreq * powernow_k6_get_cpu_multiplier();
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freqs.new = busfreq * clock_ratio[best_i].driver_data;
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cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
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/* we now need to transform best_i to the BVC format, see AMD#23446 */
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outvalue = (1<<12) | (1<<10) | (1<<9) | (best_i<<5);
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msrval = POWERNOW_IOPORT + 0x1;
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wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
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invalue = inl(POWERNOW_IOPORT + 0x8);
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invalue = invalue & 0xf;
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outvalue = outvalue | invalue;
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outl(outvalue , (POWERNOW_IOPORT + 0x8));
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msrval = POWERNOW_IOPORT + 0x0;
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wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
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cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
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return 0;
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}
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static int powernow_k6_cpu_init(struct cpufreq_policy *policy)
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{
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unsigned int i, f;
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if (policy->cpu != 0)
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return -ENODEV;
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/* get frequencies */
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max_multiplier = powernow_k6_get_cpu_multiplier();
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busfreq = cpu_khz / max_multiplier;
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/* table init */
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for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
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f = clock_ratio[i].driver_data;
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if (f > max_multiplier)
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clock_ratio[i].frequency = CPUFREQ_ENTRY_INVALID;
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else
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clock_ratio[i].frequency = busfreq * f;
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}
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/* cpuinfo and default policy values */
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policy->cpuinfo.transition_latency = 200000;
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return cpufreq_table_validate_and_show(policy, clock_ratio);
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}
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static int powernow_k6_cpu_exit(struct cpufreq_policy *policy)
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{
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unsigned int i;
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for (i = 0; i < 8; i++) {
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if (i == max_multiplier)
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powernow_k6_target(policy, i);
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}
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cpufreq_frequency_table_put_attr(policy->cpu);
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return 0;
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}
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static unsigned int powernow_k6_get(unsigned int cpu)
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{
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unsigned int ret;
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ret = (busfreq * powernow_k6_get_cpu_multiplier());
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return ret;
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}
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static struct cpufreq_driver powernow_k6_driver = {
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.verify = cpufreq_generic_frequency_table_verify,
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.target_index = powernow_k6_target,
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.init = powernow_k6_cpu_init,
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.exit = powernow_k6_cpu_exit,
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.get = powernow_k6_get,
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.name = "powernow-k6",
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.attr = cpufreq_generic_attr,
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};
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static const struct x86_cpu_id powernow_k6_ids[] = {
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{ X86_VENDOR_AMD, 5, 12 },
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{ X86_VENDOR_AMD, 5, 13 },
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, powernow_k6_ids);
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/**
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* powernow_k6_init - initializes the k6 PowerNow! CPUFreq driver
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*
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* Initializes the K6 PowerNow! support. Returns -ENODEV on unsupported
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* devices, -EINVAL or -ENOMEM on problems during initiatization, and zero
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* on success.
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*/
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static int __init powernow_k6_init(void)
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{
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if (!x86_match_cpu(powernow_k6_ids))
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return -ENODEV;
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if (!request_region(POWERNOW_IOPORT, 16, "PowerNow!")) {
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printk(KERN_INFO PFX "PowerNow IOPORT region already used.\n");
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return -EIO;
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}
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if (cpufreq_register_driver(&powernow_k6_driver)) {
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release_region(POWERNOW_IOPORT, 16);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* powernow_k6_exit - unregisters AMD K6-2+/3+ PowerNow! support
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*
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* Unregisters AMD K6-2+ / K6-3+ PowerNow! support.
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*/
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static void __exit powernow_k6_exit(void)
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{
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cpufreq_unregister_driver(&powernow_k6_driver);
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release_region(POWERNOW_IOPORT, 16);
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}
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MODULE_AUTHOR("Arjan van de Ven, Dave Jones <davej@redhat.com>, "
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"Dominik Brodowski <linux@brodo.de>");
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MODULE_DESCRIPTION("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
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MODULE_LICENSE("GPL");
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module_init(powernow_k6_init);
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module_exit(powernow_k6_exit);
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