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| author |   Borislav Petkov <bp@suse.de> | 2020-10-15 12:28:58 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-11-16 17:42:12 +0100 |
| commit | 8113ab20e850491b4144a1a64246f07a2d737a49 (patch) | |
| tree | 84ff07078bbf6e1e3dda50f7f4b7fff8d8336cd1 /tools/power/cpupower/lib | |
| parent | MAINTAINERS: Cleanup SGI-related entries (diff) | |
| download | linux-dev-8113ab20e850491b4144a1a64246f07a2d737a49.tar.xz linux-dev-8113ab20e850491b4144a1a64246f07a2d737a49.zip | |
tools/power/cpupower: Read energy_perf_bias from sysfs
... instead of poking at the MSR. For that, move the accessor functions
to misc.c and add a sysfs-writing function too.
There should be no functional changes resulting from this.
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Cc: Thomas Renninger <trenn@suse.com>
Link: https://lkml.kernel.org/r/20201029190259.3476-2-bp@alien8.de
Diffstat (limited to 'tools/power/cpupower/lib')
| -rw-r--r-- | tools/power/cpupower/lib/cpupower.c | 23 | ||||
| -rw-r--r-- | tools/power/cpupower/lib/cpupower_intern.h | 5 |
2 files changed, 27 insertions, 1 deletions
diff --git a/tools/power/cpupower/lib/cpupower.c b/tools/power/cpupower/lib/cpupower.c index 3656e697537e..3f7d0c0c5067 100644 --- a/tools/power/cpupower/lib/cpupower.c +++ b/tools/power/cpupower/lib/cpupower.c @@ -16,8 +16,8 @@ unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen) { - int fd; ssize_t numread; + int fd; fd = open(path, O_RDONLY); if (fd == -1) @@ -35,6 +35,27 @@ unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen) return (unsigned int) numread; } +unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen) +{ + ssize_t numwritten; + int fd; + + fd = open(path, O_WRONLY); + if (fd == -1) + return 0; + + numwritten = write(fd, buf, buflen - 1); + if (numwritten < 1) { + perror(path); + close(fd); + return -1; + } + + close(fd); + + return (unsigned int) numwritten; +} + /* * Detect whether a CPU is online * diff --git a/tools/power/cpupower/lib/cpupower_intern.h b/tools/power/cpupower/lib/cpupower_intern.h index 4887c76d23f8..ac1112b956ec 100644 --- a/tools/power/cpupower/lib/cpupower_intern.h +++ b/tools/power/cpupower/lib/cpupower_intern.h @@ -1,6 +1,11 @@ /* SPDX-License-Identifier: GPL-2.0 */ #define PATH_TO_CPU "/sys/devices/system/cpu/" + +#ifndef MAX_LINE_LEN #define MAX_LINE_LEN 4096 +#endif + #define SYSFS_PATH_MAX 255 unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen); +unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen); |