mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-01-07 13:43:51 +00:00
perf: Sysfs enumeration
Simple sysfs emumeration of the PMUs. Use a "event_source" bus, and add PMU devices using their name. Each PMU device has a type attribute which contrains the value needed for perf_event_attr::type to identify this PMU. This is the minimal stub needed to start using this interface, we'll consider extending the sysfs usage later. Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Greg KH <gregkh@suse.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20101117222056.316982569@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
parent
2e80a82a49
commit
abe4340057
@ -588,6 +588,7 @@ struct perf_event;
|
|||||||
struct pmu {
|
struct pmu {
|
||||||
struct list_head entry;
|
struct list_head entry;
|
||||||
|
|
||||||
|
struct device *dev;
|
||||||
char *name;
|
char *name;
|
||||||
int type;
|
int type;
|
||||||
|
|
||||||
|
@ -24,6 +24,7 @@
|
|||||||
#include <linux/ptrace.h>
|
#include <linux/ptrace.h>
|
||||||
#include <linux/reboot.h>
|
#include <linux/reboot.h>
|
||||||
#include <linux/vmstat.h>
|
#include <linux/vmstat.h>
|
||||||
|
#include <linux/device.h>
|
||||||
#include <linux/vmalloc.h>
|
#include <linux/vmalloc.h>
|
||||||
#include <linux/hardirq.h>
|
#include <linux/hardirq.h>
|
||||||
#include <linux/rculist.h>
|
#include <linux/rculist.h>
|
||||||
@ -5308,6 +5309,58 @@ static void free_pmu_context(struct pmu *pmu)
|
|||||||
}
|
}
|
||||||
static struct idr pmu_idr;
|
static struct idr pmu_idr;
|
||||||
|
|
||||||
|
static ssize_t
|
||||||
|
type_show(struct device *dev, struct device_attribute *attr, char *page)
|
||||||
|
{
|
||||||
|
struct pmu *pmu = dev_get_drvdata(dev);
|
||||||
|
|
||||||
|
return snprintf(page, PAGE_SIZE-1, "%d\n", pmu->type);
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct device_attribute pmu_dev_attrs[] = {
|
||||||
|
__ATTR_RO(type),
|
||||||
|
__ATTR_NULL,
|
||||||
|
};
|
||||||
|
|
||||||
|
static int pmu_bus_running;
|
||||||
|
static struct bus_type pmu_bus = {
|
||||||
|
.name = "event_source",
|
||||||
|
.dev_attrs = pmu_dev_attrs,
|
||||||
|
};
|
||||||
|
|
||||||
|
static void pmu_dev_release(struct device *dev)
|
||||||
|
{
|
||||||
|
kfree(dev);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int pmu_dev_alloc(struct pmu *pmu)
|
||||||
|
{
|
||||||
|
int ret = -ENOMEM;
|
||||||
|
|
||||||
|
pmu->dev = kzalloc(sizeof(struct device), GFP_KERNEL);
|
||||||
|
if (!pmu->dev)
|
||||||
|
goto out;
|
||||||
|
|
||||||
|
device_initialize(pmu->dev);
|
||||||
|
ret = dev_set_name(pmu->dev, "%s", pmu->name);
|
||||||
|
if (ret)
|
||||||
|
goto free_dev;
|
||||||
|
|
||||||
|
dev_set_drvdata(pmu->dev, pmu);
|
||||||
|
pmu->dev->bus = &pmu_bus;
|
||||||
|
pmu->dev->release = pmu_dev_release;
|
||||||
|
ret = device_add(pmu->dev);
|
||||||
|
if (ret)
|
||||||
|
goto free_dev;
|
||||||
|
|
||||||
|
out:
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
free_dev:
|
||||||
|
put_device(pmu->dev);
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
int perf_pmu_register(struct pmu *pmu, char *name, int type)
|
int perf_pmu_register(struct pmu *pmu, char *name, int type)
|
||||||
{
|
{
|
||||||
int cpu, ret;
|
int cpu, ret;
|
||||||
@ -5336,6 +5389,12 @@ int perf_pmu_register(struct pmu *pmu, char *name, int type)
|
|||||||
}
|
}
|
||||||
pmu->type = type;
|
pmu->type = type;
|
||||||
|
|
||||||
|
if (pmu_bus_running) {
|
||||||
|
ret = pmu_dev_alloc(pmu);
|
||||||
|
if (ret)
|
||||||
|
goto free_idr;
|
||||||
|
}
|
||||||
|
|
||||||
skip_type:
|
skip_type:
|
||||||
pmu->pmu_cpu_context = find_pmu_context(pmu->task_ctx_nr);
|
pmu->pmu_cpu_context = find_pmu_context(pmu->task_ctx_nr);
|
||||||
if (pmu->pmu_cpu_context)
|
if (pmu->pmu_cpu_context)
|
||||||
@ -5343,7 +5402,7 @@ int perf_pmu_register(struct pmu *pmu, char *name, int type)
|
|||||||
|
|
||||||
pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context);
|
pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context);
|
||||||
if (!pmu->pmu_cpu_context)
|
if (!pmu->pmu_cpu_context)
|
||||||
goto free_ird;
|
goto free_dev;
|
||||||
|
|
||||||
for_each_possible_cpu(cpu) {
|
for_each_possible_cpu(cpu) {
|
||||||
struct perf_cpu_context *cpuctx;
|
struct perf_cpu_context *cpuctx;
|
||||||
@ -5387,6 +5446,10 @@ int perf_pmu_register(struct pmu *pmu, char *name, int type)
|
|||||||
|
|
||||||
return ret;
|
return ret;
|
||||||
|
|
||||||
|
free_dev:
|
||||||
|
device_del(pmu->dev);
|
||||||
|
put_device(pmu->dev);
|
||||||
|
|
||||||
free_idr:
|
free_idr:
|
||||||
if (pmu->type >= PERF_TYPE_MAX)
|
if (pmu->type >= PERF_TYPE_MAX)
|
||||||
idr_remove(&pmu_idr, pmu->type);
|
idr_remove(&pmu_idr, pmu->type);
|
||||||
@ -5412,6 +5475,8 @@ void perf_pmu_unregister(struct pmu *pmu)
|
|||||||
free_percpu(pmu->pmu_disable_count);
|
free_percpu(pmu->pmu_disable_count);
|
||||||
if (pmu->type >= PERF_TYPE_MAX)
|
if (pmu->type >= PERF_TYPE_MAX)
|
||||||
idr_remove(&pmu_idr, pmu->type);
|
idr_remove(&pmu_idr, pmu->type);
|
||||||
|
device_del(pmu->dev);
|
||||||
|
put_device(pmu->dev);
|
||||||
free_pmu_context(pmu);
|
free_pmu_context(pmu);
|
||||||
}
|
}
|
||||||
|
|
||||||
@ -6603,3 +6668,31 @@ void __init perf_event_init(void)
|
|||||||
ret = init_hw_breakpoint();
|
ret = init_hw_breakpoint();
|
||||||
WARN(ret, "hw_breakpoint initialization failed with: %d", ret);
|
WARN(ret, "hw_breakpoint initialization failed with: %d", ret);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
static int __init perf_event_sysfs_init(void)
|
||||||
|
{
|
||||||
|
struct pmu *pmu;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
mutex_lock(&pmus_lock);
|
||||||
|
|
||||||
|
ret = bus_register(&pmu_bus);
|
||||||
|
if (ret)
|
||||||
|
goto unlock;
|
||||||
|
|
||||||
|
list_for_each_entry(pmu, &pmus, entry) {
|
||||||
|
if (!pmu->name || pmu->type < 0)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
ret = pmu_dev_alloc(pmu);
|
||||||
|
WARN(ret, "Failed to register pmu: %s, reason %d\n", pmu->name, ret);
|
||||||
|
}
|
||||||
|
pmu_bus_running = 1;
|
||||||
|
ret = 0;
|
||||||
|
|
||||||
|
unlock:
|
||||||
|
mutex_unlock(&pmus_lock);
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
device_initcall(perf_event_sysfs_init);
|
||||||
|
Loading…
Reference in New Issue
Block a user