| 1 | |
| 2 |
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| 3 | #include <stdio.h>
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| 4 | #include <errno.h>
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| 5 | #include <stdlib.h>
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| 6 | #include <string.h>
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| 7 | #include <sys/types.h>
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| 8 | #include <sys/stat.h>
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| 9 | #include <fcntl.h>
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| 10 | #include <unistd.h>
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| 11 |
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| 12 | #include "cpupower_intern.h"
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| 13 | #include "acpi_cppc.h"
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| 14 |
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| 15 |
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| 16 |
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| 17 | static int acpi_cppc_read_file(unsigned int cpu, const char *fname,
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| 18 | char *buf, size_t buflen)
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| 19 | {
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| 20 | char path[SYSFS_PATH_MAX];
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| 21 |
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| 22 | snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/acpi_cppc/%s",
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| 23 | cpu, fname);
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| 24 | return cpupower_read_sysfs(path, buf, buflen);
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| 25 | }
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| 26 |
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| 27 | static const char * const acpi_cppc_value_files[] = {
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| 28 | [HIGHEST_PERF] = "highest_perf",
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| 29 | [LOWEST_PERF] = "lowest_perf",
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| 30 | [NOMINAL_PERF] = "nominal_perf",
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| 31 | [LOWEST_NONLINEAR_PERF] = "lowest_nonlinear_perf",
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| 32 | [LOWEST_FREQ] = "lowest_freq",
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| 33 | [NOMINAL_FREQ] = "nominal_freq",
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| 34 | [REFERENCE_PERF] = "reference_perf",
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| 35 | [WRAPAROUND_TIME] = "wraparound_time"
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| 36 | };
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| 37 |
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| 38 | unsigned long acpi_cppc_get_data(unsigned int cpu, enum acpi_cppc_value which)
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| 39 | {
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| 40 | unsigned long long value;
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| 41 | unsigned int len;
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| 42 | char linebuf[MAX_LINE_LEN];
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| 43 | char *endp;
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| 44 |
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| 45 | if (which >= MAX_CPPC_VALUE_FILES)
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| 46 | return 0;
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| 47 |
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| 48 | len = acpi_cppc_read_file(cpu, acpi_cppc_value_files[which],
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| 49 | linebuf, sizeof(linebuf));
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| 50 | if (len == 0)
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| 51 | return 0;
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| 52 |
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| 53 | value = strtoull(linebuf, &endp, 0);
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| 54 |
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| 55 | if (endp == linebuf || errno == ERANGE)
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| 56 | return 0;
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| 57 |
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| 58 | return value;
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| 59 | }
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