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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-02-18 18:40:14 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-03-09 14:41:08 +0100 |
commit | 7d5a9956af4ccf7d5cc0cd1f8d27d1691321bfc6 (patch) | |
tree | b88c44858b80d9d9e4f0ad67f639b5ab9589afa1 /drivers/cpufreq/cpufreq_conservative.c | |
parent | d1db75fffc22504c586c3fae8d602384ea899340 (diff) | |
download | linux-7d5a9956af4ccf7d5cc0cd1f8d27d1691321bfc6.tar.gz linux-7d5a9956af4ccf7d5cc0cd1f8d27d1691321bfc6.tar.bz2 linux-7d5a9956af4ccf7d5cc0cd1f8d27d1691321bfc6.zip |
cpufreq: governor: Make governor private data per-policy
Some fields in struct od_cpu_dbs_info_s and struct cs_cpu_dbs_info_s
are only used for a limited set of CPUs. Namely, if a policy is
shared between multiple CPUs, those fields will only be used for one
of them (policy->cpu). This means that they really are per-policy
rather than per-CPU and holding room for them in per-CPU data
structures is generally wasteful. Also moving those fields into
per-policy data structures will allow some significant simplifications
to be made going forward.
For this reason, introduce struct cs_policy_dbs_info and
struct od_policy_dbs_info to hold those fields. Define each of the
new structures as an extension of struct policy_dbs_info (such that
struct policy_dbs_info is embedded in each of them) and introduce
new ->alloc and ->free governor callbacks to allocate and free
those structures, respectively, such that ->alloc() will return
a pointer to the struct policy_dbs_info embedded in the allocated
data structure and ->free() will take that pointer as its argument.
With that, modify the code accessing the data fields in question
in per-CPU data objects to look for them in the new structures
via the struct policy_dbs_info pointer available to it and drop
them from struct od_cpu_dbs_info_s and struct cs_cpu_dbs_info_s.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/cpufreq_conservative.c')
-rw-r--r-- | drivers/cpufreq/cpufreq_conservative.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index 876984c842b1..ffffda2dcbfc 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -14,6 +14,17 @@ #include <linux/slab.h> #include "cpufreq_governor.h" +struct cs_policy_dbs_info { + struct policy_dbs_info policy_dbs; + unsigned int down_skip; + unsigned int requested_freq; +}; + +static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs) +{ + return container_of(policy_dbs, struct cs_policy_dbs_info, policy_dbs); +} + /* Conservative governor macros */ #define DEF_FREQUENCY_UP_THRESHOLD (80) #define DEF_FREQUENCY_DOWN_THRESHOLD (20) @@ -48,8 +59,8 @@ static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners, */ static unsigned int cs_dbs_timer(struct cpufreq_policy *policy) { - struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, policy->cpu); struct policy_dbs_info *policy_dbs = policy->governor_data; + struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); struct dbs_data *dbs_data = policy_dbs->dbs_data; struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; unsigned int load = dbs_update(policy); @@ -238,6 +249,19 @@ static struct attribute *cs_attributes[] = { /************************** sysfs end ************************/ +static struct policy_dbs_info *cs_alloc(void) +{ + struct cs_policy_dbs_info *dbs_info; + + dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL); + return dbs_info ? &dbs_info->policy_dbs : NULL; +} + +static void cs_free(struct policy_dbs_info *policy_dbs) +{ + kfree(to_dbs_info(policy_dbs)); +} + static int cs_init(struct dbs_data *dbs_data, bool notify) { struct cs_dbs_tuners *tuners; @@ -276,7 +300,7 @@ static void cs_exit(struct dbs_data *dbs_data, bool notify) static void cs_start(struct cpufreq_policy *policy) { - struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, policy->cpu); + struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); dbs_info->down_skip = 0; dbs_info->requested_freq = policy->cur; @@ -294,6 +318,8 @@ static struct dbs_governor cs_dbs_gov = { .kobj_type = { .default_attrs = cs_attributes }, .get_cpu_cdbs = get_cpu_cdbs, .gov_dbs_timer = cs_dbs_timer, + .alloc = cs_alloc, + .free = cs_free, .init = cs_init, .exit = cs_exit, .start = cs_start, @@ -305,9 +331,8 @@ static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data) { struct cpufreq_freqs *freq = data; - struct cs_cpu_dbs_info_s *dbs_info = - &per_cpu(cs_cpu_dbs_info, freq->cpu); struct cpufreq_policy *policy = cpufreq_cpu_get_raw(freq->cpu); + struct cs_policy_dbs_info *dbs_info; if (!policy) return 0; @@ -316,6 +341,7 @@ static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val, if (policy->governor != CPU_FREQ_GOV_CONSERVATIVE) return 0; + dbs_info = to_dbs_info(policy->governor_data); /* * we only care if our internally tracked freq moves outside the 'valid' * ranges of frequency available to us otherwise we do not change it |