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>
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2e80a82a49
Коммит
abe4340057
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@ -588,6 +588,7 @@ struct perf_event;
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struct pmu {
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struct list_head entry;
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struct device *dev;
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char *name;
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int type;
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@ -24,6 +24,7 @@
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#include <linux/ptrace.h>
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#include <linux/reboot.h>
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#include <linux/vmstat.h>
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#include <linux/device.h>
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#include <linux/vmalloc.h>
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#include <linux/hardirq.h>
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#include <linux/rculist.h>
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@ -5308,6 +5309,58 @@ out:
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}
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static struct idr pmu_idr;
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static ssize_t
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type_show(struct device *dev, struct device_attribute *attr, char *page)
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{
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struct pmu *pmu = dev_get_drvdata(dev);
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return snprintf(page, PAGE_SIZE-1, "%d\n", pmu->type);
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}
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static struct device_attribute pmu_dev_attrs[] = {
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__ATTR_RO(type),
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__ATTR_NULL,
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};
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static int pmu_bus_running;
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static struct bus_type pmu_bus = {
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.name = "event_source",
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.dev_attrs = pmu_dev_attrs,
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};
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static void pmu_dev_release(struct device *dev)
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{
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kfree(dev);
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}
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static int pmu_dev_alloc(struct pmu *pmu)
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{
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int ret = -ENOMEM;
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pmu->dev = kzalloc(sizeof(struct device), GFP_KERNEL);
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if (!pmu->dev)
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goto out;
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device_initialize(pmu->dev);
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ret = dev_set_name(pmu->dev, "%s", pmu->name);
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if (ret)
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goto free_dev;
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dev_set_drvdata(pmu->dev, pmu);
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pmu->dev->bus = &pmu_bus;
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pmu->dev->release = pmu_dev_release;
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ret = device_add(pmu->dev);
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if (ret)
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goto free_dev;
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out:
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return ret;
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free_dev:
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put_device(pmu->dev);
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goto out;
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}
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int perf_pmu_register(struct pmu *pmu, char *name, int type)
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{
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int cpu, ret;
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@ -5336,6 +5389,12 @@ int perf_pmu_register(struct pmu *pmu, char *name, int type)
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}
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pmu->type = type;
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if (pmu_bus_running) {
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ret = pmu_dev_alloc(pmu);
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if (ret)
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goto free_idr;
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}
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skip_type:
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pmu->pmu_cpu_context = find_pmu_context(pmu->task_ctx_nr);
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if (pmu->pmu_cpu_context)
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@ -5343,7 +5402,7 @@ skip_type:
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pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context);
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if (!pmu->pmu_cpu_context)
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goto free_ird;
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goto free_dev;
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for_each_possible_cpu(cpu) {
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struct perf_cpu_context *cpuctx;
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@ -5387,6 +5446,10 @@ unlock:
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return ret;
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free_dev:
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device_del(pmu->dev);
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put_device(pmu->dev);
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free_idr:
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if (pmu->type >= PERF_TYPE_MAX)
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idr_remove(&pmu_idr, pmu->type);
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@ -5412,6 +5475,8 @@ void perf_pmu_unregister(struct pmu *pmu)
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free_percpu(pmu->pmu_disable_count);
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if (pmu->type >= PERF_TYPE_MAX)
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idr_remove(&pmu_idr, pmu->type);
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device_del(pmu->dev);
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put_device(pmu->dev);
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free_pmu_context(pmu);
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}
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@ -6603,3 +6668,31 @@ void __init perf_event_init(void)
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ret = init_hw_breakpoint();
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WARN(ret, "hw_breakpoint initialization failed with: %d", ret);
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}
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static int __init perf_event_sysfs_init(void)
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{
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struct pmu *pmu;
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int ret;
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mutex_lock(&pmus_lock);
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ret = bus_register(&pmu_bus);
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if (ret)
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goto unlock;
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list_for_each_entry(pmu, &pmus, entry) {
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if (!pmu->name || pmu->type < 0)
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continue;
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ret = pmu_dev_alloc(pmu);
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WARN(ret, "Failed to register pmu: %s, reason %d\n", pmu->name, ret);
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}
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pmu_bus_running = 1;
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ret = 0;
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unlock:
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mutex_unlock(&pmus_lock);
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return ret;
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}
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device_initcall(perf_event_sysfs_init);
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