litmus-rt.git - The LITMUS^RT kernel.

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Commits per author per week (path 'include/linux/signal.h')

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/* * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> * * Licensed under the terms of the GNU GPL License version 2. * * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous* */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/cpufreq.h> #include <linux/timex.h> #include <asm/msr.h> #include <asm/processor.h> static struct cpufreq_driver longrun_driver; /** * longrun_{low,high}_freq is needed for the conversion of cpufreq kHz * values into per cent values. In TMTA microcode, the following is valid: * performance_pctg = (current_freq - low_freq)/(high_freq - low_freq) */ static unsigned int longrun_low_freq, longrun_high_freq; /** * longrun_get_policy - get the current LongRun policy * @policy: struct cpufreq_policy where current policy is written into * * Reads the current LongRun policy by access to MSR_TMTA_LONGRUN_FLAGS * and MSR_TMTA_LONGRUN_CTRL */ static void __cpuinit longrun_get_policy(struct cpufreq_policy *policy) { u32 msr_lo, msr_hi; rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi); pr_debug("longrun flags are %x - %x\n", msr_lo, msr_hi); if (msr_lo & 0x01) policy->policy = CPUFREQ_POLICY_PERFORMANCE; else policy->policy = CPUFREQ_POLICY_POWERSAVE; rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi); pr_debug("longrun ctrl is %x - %x\n", msr_lo, msr_hi); msr_lo &= 0x0000007F; msr_hi &= 0x0000007F; if (longrun_high_freq <= longrun_low_freq) { /* Assume degenerate Longrun table */ policy->min = policy->max = longrun_high_freq; } else { policy->min = longrun_low_freq + msr_lo * ((longrun_high_freq - longrun_low_freq) / 100); policy->max = longrun_low_freq + msr_hi * ((longrun_high_freq - longrun_low_freq) / 100); } policy->cpu = 0; } /** * longrun_set_policy - sets a new CPUFreq policy * @policy: new policy * * Sets a new CPUFreq policy on LongRun-capable processors. This function * has to be called with cpufreq_driver locked. */ static int longrun_set_policy(struct cpufreq_policy *policy) { u32 msr_lo, msr_hi; u32 pctg_lo, pctg_hi; if (!policy) return -EINVAL; if (longrun_high_freq <= longrun_low_freq) { /* Assume degenerate Longrun table */ pctg_lo = pctg_hi = 100; } else { pctg_lo = (policy->min - longrun_low_freq) / ((longrun_high_freq - longrun_low_freq) / 100); pctg_hi = (policy->max - longrun_low_freq) / ((longrun_high_freq - longrun_low_freq) / 100); } if (pctg_hi > 100) pctg_hi = 100; if (pctg_lo > pctg_hi) pctg_lo = pctg_hi; /* performance or economy mode */ rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi); msr_lo &= 0xFFFFFFFE; switch (policy->policy) { case CPUFREQ_POLICY_PERFORMANCE: msr_lo |= 0x00000001; break; case CPUFREQ_POLICY_POWERSAVE: break; } wrmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi); /* lower and upper boundary */ rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi); msr_lo &= 0xFFFFFF80; msr_hi &= 0xFFFFFF80; msr_lo |= pctg_lo; msr_hi |= pctg_hi; wrmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi); return 0; } /** * longrun_verify_poliy - verifies a new CPUFreq policy * @policy: the policy to verify * * Validates a new CPUFreq policy. This function has to be called with * cpufreq_driver locked. */ static int longrun_verify_policy(struct cpufreq_policy *policy) { if (!policy) return -EINVAL; policy->cpu = 0; cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq); if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) && (policy->policy != CPUFREQ_POLICY_PERFORMANCE)) return -EINVAL; return 0; } static unsigned int longrun_get(unsigned int cpu) { u32 eax, ebx, ecx, edx; if (cpu) return 0; cpuid(0x80860007, &eax, &ebx, &ecx, &edx); pr_debug("cpuid eax is %u\n", eax); return eax * 1000; } /** * longrun_determine_freqs - determines the lowest and highest possible core frequency * @low_freq: an int to put the lowest frequency into * @high_freq: an int to put the highest frequency into * * Determines the lowest and highest possible core frequencies on this CPU. * This is necessary to calculate the performance percentage according to * TMTA rules: * performance_pctg = (target_freq - low_freq)/(high_freq - low_freq) */ static int __cpuinit longrun_determine_freqs(unsigned int *low_freq, unsigned int *high_freq) { u32 msr_lo, msr_hi; u32 save_lo, save_hi; u32 eax, ebx, ecx, edx; u32 try_hi; struct cpuinfo_x86 *c = &cpu_data(0); if (!low_freq || !high_freq) return -EINVAL; if (cpu_has(c, X86_FEATURE_LRTI)) { /* if the LongRun Table Interface is present, the * detection is a bit easier: * For minimum frequency, read out the maximum * level (msr_hi), write that into "currently * selected level", and read out the frequency. * For maximum frequency, read out level zero. */ /* minimum */ rdmsr(MSR_TMTA_LRTI_READOUT, msr_lo, msr_hi); wrmsr(MSR_TMTA_LRTI_READOUT, msr_hi, msr_hi); rdmsr(MSR_TMTA_LRTI_VOLT_MHZ, msr_lo, msr_hi); *low_freq = msr_lo * 1000; /* to kHz */ /* maximum */ wrmsr(MSR_TMTA_LRTI_READOUT, 0, msr_hi); rdmsr(MSR_TMTA_LRTI_VOLT_MHZ, msr_lo, msr_hi); *high_freq = msr_lo * 1000; /* to kHz */ pr_debug("longrun table interface told %u - %u kHz\n", *low_freq, *high_freq); if (*low_freq > *high_freq) *low_freq = *high_freq; return 0; }


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