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Commit 8aa84ad8d6c740a04386f599694609ee4998e82e

Authored by Thomas Renninger
Committed by Dave Jones
1 parent 4bfa042cd3
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

[CPUFREQ] Introduce global, not per core: /sys/devices/system/cpu/cpufreq 

Currently everything in the cpufreq layer is per core based.
This does not reflect reality, for example ondemand on conservative
governors have global sysfs variables.

Introduce a global cpufreq directory and add the kobject to the governor
struct, so that governors can easily access it.
The directory is initialized in the cpufreq_core_init initcall and thus will
always be created if cpufreq is compiled in, even if no cpufreq driver is
active later.

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Dave Jones <davej@redhat.com>

Showing 2 changed files with 18 additions and 1 deletions Side-by-side Diff

drivers/cpufreq/cpufreq.c
Diff comments   View file @ 8aa84ad
... ... @@ -686,6 +686,9 @@
686 686 NULL
687 687 };
688 688  
  689 +struct kobject *cpufreq_global_kobject;
  690 +EXPORT_SYMBOL(cpufreq_global_kobject);
  691 +
689 692 #define to_policy(k) container_of(k, struct cpufreq_policy, kobj)
690 693 #define to_attr(a) container_of(a, struct freq_attr, attr)
691 694  
692 695  
... ... @@ -1935,8 +1938,12 @@
1935 1938 per_cpu(policy_cpu, cpu) = -1;
1936 1939 init_rwsem(&per_cpu(cpu_policy_rwsem, cpu));
1937 1940 }
  1941 +
  1942 + cpufreq_global_kobject = kobject_create_and_add("cpufreq",
  1943 + &cpu_sysdev_class.kset.kobj);
  1944 + BUG_ON(!cpufreq_global_kobject);
  1945 +
1938 1946 return 0;
1939 1947 }
1940   -
1941 1948 core_initcall(cpufreq_core_init);
include/linux/cpufreq.h
Diff comments   View file @ 8aa84ad
... ... @@ -65,6 +65,9 @@
65 65  
66 66 struct cpufreq_governor;
67 67  
  68 +/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
  69 +extern struct kobject *cpufreq_global_kobject;
  70 +
68 71 #define CPUFREQ_ETERNAL (-1)
69 72 struct cpufreq_cpuinfo {
70 73 unsigned int max_freq;
... ... @@ -274,6 +277,13 @@
274 277 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
275 278 };
276 279  
  280 +struct global_attr {
  281 + struct attribute attr;
  282 + ssize_t (*show)(struct kobject *kobj,
  283 + struct attribute *attr, char *buf);
  284 + ssize_t (*store)(struct kobject *a, struct attribute *b,
  285 + const char *c, size_t count);
  286 +};
277 287  
278 288 /*********************************************************************
279 289 * CPUFREQ 2.6. INTERFACE *