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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 8/9] cpufreq: convert to a single post-init driver (hooks) instance
This reduces the post-init memory footprint, eliminates a pointless
level of indirection at the use sites, and allows for subsequent
alternatives call patching.
Take the opportunity and also add a name to the PowerNow! instance.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: New.
--- a/xen/arch/x86/acpi/cpufreq/cpufreq.c
+++ b/xen/arch/x86/acpi/cpufreq/cpufreq.c
@@ -53,8 +53,6 @@ enum {
struct acpi_cpufreq_data *cpufreq_drv_data[NR_CPUS];
-static struct cpufreq_driver acpi_cpufreq_driver;
-
static bool __read_mostly acpi_pstate_strict;
boolean_param("acpi_pstate_strict", acpi_pstate_strict);
@@ -355,7 +353,7 @@ static void feature_detect(void *info)
if ( cpu_has_aperfmperf )
{
policy->aperf_mperf = 1;
- acpi_cpufreq_driver.getavg = get_measured_perf;
+ cpufreq_driver.getavg = get_measured_perf;
}
eax = cpuid_eax(6);
@@ -593,7 +591,7 @@ acpi_cpufreq_cpu_init(struct cpufreq_pol
policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
break;
case ACPI_ADR_SPACE_FIXED_HARDWARE:
- acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
+ cpufreq_driver.get = get_cur_freq_on_cpu;
policy->cur = get_cur_freq_on_cpu(cpu);
break;
default:
@@ -635,7 +633,7 @@ static int acpi_cpufreq_cpu_exit(struct
return 0;
}
-static struct cpufreq_driver acpi_cpufreq_driver = {
+static const struct cpufreq_driver __initconstrel acpi_cpufreq_driver = {
.name = "acpi-cpufreq",
.verify = acpi_cpufreq_verify,
.target = acpi_cpufreq_target,
@@ -656,7 +654,7 @@ static int __init cpufreq_driver_init(vo
return ret;
}
-__initcall(cpufreq_driver_init);
+presmp_initcall(cpufreq_driver_init);
int cpufreq_cpu_init(unsigned int cpuid)
{
--- a/xen/arch/x86/acpi/cpufreq/powernow.c
+++ b/xen/arch/x86/acpi/cpufreq/powernow.c
@@ -52,8 +52,6 @@
#define ARCH_CPU_FLAG_RESUME 1
-static struct cpufreq_driver powernow_cpufreq_driver;
-
static void transition_pstate(void *pstate)
{
wrmsrl(MSR_PSTATE_CTRL, *(unsigned int *)pstate);
@@ -215,7 +213,7 @@ static void feature_detect(void *info)
if ( cpu_has_aperfmperf )
{
policy->aperf_mperf = 1;
- powernow_cpufreq_driver.getavg = get_measured_perf;
+ cpufreq_driver.getavg = get_measured_perf;
}
edx = cpuid_edx(CPUID_FREQ_VOLT_CAPABILITIES);
@@ -347,7 +345,8 @@ static int powernow_cpufreq_cpu_exit(str
return 0;
}
-static struct cpufreq_driver powernow_cpufreq_driver = {
+static const struct cpufreq_driver __initconstrel powernow_cpufreq_driver = {
+ .name = "powernow",
.verify = powernow_cpufreq_verify,
.target = powernow_cpufreq_target,
.init = powernow_cpufreq_cpu_init,
--- a/xen/drivers/acpi/pmstat.c
+++ b/xen/drivers/acpi/pmstat.c
@@ -64,7 +64,7 @@ int do_get_pm_info(struct xen_sysctl_get
case PMSTAT_PX:
if ( !(xen_processor_pmbits & XEN_PROCESSOR_PM_PX) )
return -ENODEV;
- if ( !cpufreq_driver )
+ if ( !cpufreq_driver.init )
return -ENODEV;
if ( !pmpt || !(pmpt->perf.init & XEN_PX_INIT) )
return -EINVAL;
@@ -255,16 +255,16 @@ static int get_cpufreq_para(struct xen_s
return ret;
op->u.get_para.cpuinfo_cur_freq =
- cpufreq_driver->get ? cpufreq_driver->get(op->cpuid) : policy->cur;
+ cpufreq_driver.get ? cpufreq_driver.get(op->cpuid) : policy->cur;
op->u.get_para.cpuinfo_max_freq = policy->cpuinfo.max_freq;
op->u.get_para.cpuinfo_min_freq = policy->cpuinfo.min_freq;
op->u.get_para.scaling_cur_freq = policy->cur;
op->u.get_para.scaling_max_freq = policy->max;
op->u.get_para.scaling_min_freq = policy->min;
- if ( cpufreq_driver->name[0] )
+ if ( cpufreq_driver.name[0] )
strlcpy(op->u.get_para.scaling_driver,
- cpufreq_driver->name, CPUFREQ_NAME_LEN);
+ cpufreq_driver.name, CPUFREQ_NAME_LEN);
else
strlcpy(op->u.get_para.scaling_driver, "Unknown", CPUFREQ_NAME_LEN);
--- a/xen/drivers/cpufreq/cpufreq.c
+++ b/xen/drivers/cpufreq/cpufreq.c
@@ -172,7 +172,7 @@ int cpufreq_add_cpu(unsigned int cpu)
if ( !(perf->init & XEN_PX_INIT) )
return -EINVAL;
- if (!cpufreq_driver)
+ if (!cpufreq_driver.init)
return 0;
if (per_cpu(cpufreq_cpu_policy, cpu))
@@ -239,7 +239,7 @@ int cpufreq_add_cpu(unsigned int cpu)
policy->cpu = cpu;
per_cpu(cpufreq_cpu_policy, cpu) = policy;
- ret = cpufreq_driver->init(policy);
+ ret = cpufreq_driver.init(policy);
if (ret) {
free_cpumask_var(policy->cpus);
xfree(policy);
@@ -298,7 +298,7 @@ err1:
cpumask_clear_cpu(cpu, cpufreq_dom->map);
if (cpumask_empty(policy->cpus)) {
- cpufreq_driver->exit(policy);
+ cpufreq_driver.exit(policy);
free_cpumask_var(policy->cpus);
xfree(policy);
}
@@ -362,7 +362,7 @@ int cpufreq_del_cpu(unsigned int cpu)
cpumask_clear_cpu(cpu, cpufreq_dom->map);
if (cpumask_empty(policy->cpus)) {
- cpufreq_driver->exit(policy);
+ cpufreq_driver.exit(policy);
free_cpumask_var(policy->cpus);
xfree(policy);
}
@@ -663,17 +663,17 @@ static int __init cpufreq_presmp_init(vo
}
presmp_initcall(cpufreq_presmp_init);
-int __init cpufreq_register_driver(struct cpufreq_driver *driver_data)
+int __init cpufreq_register_driver(const struct cpufreq_driver *driver_data)
{
if ( !driver_data || !driver_data->init ||
!driver_data->verify || !driver_data->exit ||
(!driver_data->target == !driver_data->setpolicy) )
return -EINVAL;
- if ( cpufreq_driver )
+ if ( cpufreq_driver.init )
return -EBUSY;
- cpufreq_driver = driver_data;
+ cpufreq_driver = *driver_data;
return 0;
}
--- a/xen/drivers/cpufreq/utility.c
+++ b/xen/drivers/cpufreq/utility.c
@@ -31,7 +31,7 @@
#include <acpi/cpufreq/cpufreq.h>
#include <public/sysctl.h>
-struct cpufreq_driver *cpufreq_driver;
+struct cpufreq_driver __read_mostly cpufreq_driver;
struct processor_pminfo *__read_mostly processor_pminfo[NR_CPUS];
DEFINE_PER_CPU_READ_MOSTLY(struct cpufreq_policy *, cpufreq_cpu_policy);
@@ -360,11 +360,11 @@ int __cpufreq_driver_target(struct cpufr
{
int retval = -EINVAL;
- if (cpu_online(policy->cpu) && cpufreq_driver->target)
+ if (cpu_online(policy->cpu) && cpufreq_driver.target)
{
unsigned int prev_freq = policy->cur;
- retval = cpufreq_driver->target(policy, target_freq, relation);
+ retval = cpufreq_driver.target(policy, target_freq, relation);
if ( retval == 0 )
TRACE_2D(TRC_PM_FREQ_CHANGE, prev_freq/1000, policy->cur/1000);
}
@@ -380,9 +380,9 @@ int cpufreq_driver_getavg(unsigned int c
if (!cpu_online(cpu) || !(policy = per_cpu(cpufreq_cpu_policy, cpu)))
return 0;
- if (cpufreq_driver->getavg)
+ if (cpufreq_driver.getavg)
{
- freq_avg = cpufreq_driver->getavg(cpu, flag);
+ freq_avg = cpufreq_driver.getavg(cpu, flag);
if (freq_avg > 0)
return freq_avg;
}
@@ -412,9 +412,9 @@ int cpufreq_update_turbo(int cpuid, int
return 0;
policy->turbo = new_state;
- if (cpufreq_driver->update)
+ if (cpufreq_driver.update)
{
- ret = cpufreq_driver->update(cpuid, policy);
+ ret = cpufreq_driver.update(cpuid, policy);
if (ret)
policy->turbo = curr_state;
}
@@ -450,15 +450,15 @@ int __cpufreq_set_policy(struct cpufreq_
return -EINVAL;
/* verify the cpu speed can be set within this limit */
- ret = cpufreq_driver->verify(policy);
+ ret = cpufreq_driver.verify(policy);
if (ret)
return ret;
data->min = policy->min;
data->max = policy->max;
data->limits = policy->limits;
- if (cpufreq_driver->setpolicy)
- return cpufreq_driver->setpolicy(data);
+ if (cpufreq_driver.setpolicy)
+ return cpufreq_driver.setpolicy(data);
if (policy->governor != data->governor) {
/* save old, working values */
--- a/xen/include/acpi/cpufreq/cpufreq.h
+++ b/xen/include/acpi/cpufreq/cpufreq.h
@@ -153,7 +153,7 @@ __cpufreq_governor(struct cpufreq_policy
#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
struct cpufreq_driver {
- char name[CPUFREQ_NAME_LEN];
+ const char *name;
int (*init)(struct cpufreq_policy *policy);
int (*verify)(struct cpufreq_policy *policy);
int (*setpolicy)(struct cpufreq_policy *policy);
@@ -166,9 +166,9 @@ struct cpufreq_driver {
int (*exit)(struct cpufreq_policy *policy);
};
-extern struct cpufreq_driver *cpufreq_driver;
+extern struct cpufreq_driver cpufreq_driver;
-int cpufreq_register_driver(struct cpufreq_driver *);
+int cpufreq_register_driver(const struct cpufreq_driver *);
static __inline__
void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
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