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Linux/tools/power/cpupower/utils/helpers/msr.c

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  1 #if defined(__i386__) || defined(__x86_64__)
  2 
  3 #include <fcntl.h>
  4 #include <stdio.h>
  5 #include <unistd.h>
  6 #include <stdint.h>
  7 
  8 #include "helpers/helpers.h"
  9 
 10 /* Intel specific MSRs */
 11 #define MSR_IA32_PERF_STATUS            0x198
 12 #define MSR_IA32_MISC_ENABLES           0x1a0
 13 #define MSR_IA32_ENERGY_PERF_BIAS       0x1b0
 14 #define MSR_NEHALEM_TURBO_RATIO_LIMIT   0x1ad
 15 
 16 /*
 17  * read_msr
 18  *
 19  * Will return 0 on success and -1 on failure.
 20  * Possible errno values could be:
 21  * EFAULT -If the read/write did not fully complete
 22  * EIO    -If the CPU does not support MSRs
 23  * ENXIO  -If the CPU does not exist
 24  */
 25 
 26 int read_msr(int cpu, unsigned int idx, unsigned long long *val)
 27 {
 28         int fd;
 29         char msr_file_name[64];
 30 
 31         sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
 32         fd = open(msr_file_name, O_RDONLY);
 33         if (fd < 0)
 34                 return -1;
 35         if (lseek(fd, idx, SEEK_CUR) == -1)
 36                 goto err;
 37         if (read(fd, val, sizeof *val) != sizeof *val)
 38                 goto err;
 39         close(fd);
 40         return 0;
 41  err:
 42         close(fd);
 43         return -1;
 44 }
 45 
 46 /*
 47  * write_msr
 48  *
 49  * Will return 0 on success and -1 on failure.
 50  * Possible errno values could be:
 51  * EFAULT -If the read/write did not fully complete
 52  * EIO    -If the CPU does not support MSRs
 53  * ENXIO  -If the CPU does not exist
 54  */
 55 int write_msr(int cpu, unsigned int idx, unsigned long long val)
 56 {
 57         int fd;
 58         char msr_file_name[64];
 59 
 60         sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
 61         fd = open(msr_file_name, O_WRONLY);
 62         if (fd < 0)
 63                 return -1;
 64         if (lseek(fd, idx, SEEK_CUR) == -1)
 65                 goto err;
 66         if (write(fd, &val, sizeof val) != sizeof val)
 67                 goto err;
 68         close(fd);
 69         return 0;
 70  err:
 71         close(fd);
 72         return -1;
 73 }
 74 
 75 int msr_intel_get_perf_bias(unsigned int cpu)
 76 {
 77         unsigned long long val;
 78         int ret;
 79 
 80         if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS))
 81                 return -1;
 82 
 83         ret = read_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, &val);
 84         if (ret)
 85                 return ret;
 86         return val;
 87 }
 88 
 89 int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val)
 90 {
 91         int ret;
 92 
 93         if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS))
 94                 return -1;
 95 
 96         ret = write_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, val);
 97         if (ret)
 98                 return ret;
 99         return 0;
100 }
101 
102 unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
103 {
104         unsigned long long val;
105         int ret;
106 
107         if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_HAS_TURBO_RATIO))
108                 return -1;
109 
110         ret = read_msr(cpu, MSR_NEHALEM_TURBO_RATIO_LIMIT, &val);
111         if (ret)
112                 return ret;
113         return val;
114 }
115 #endif
116 

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