2012-07-20 02:15:04 -07:00
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/*
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2011-01-21 03:06:52 -07:00
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* Copyright IBM Corp. 2010
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* Author: Heinz Graalfs <graalfs@de.ibm.com>
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*/
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2011-05-23 01:24:48 -07:00
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#include <linux/kernel_stat.h>
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2011-01-21 03:06:52 -07:00
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/workqueue.h>
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#include <linux/interrupt.h>
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#include <linux/notifier.h>
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#include <linux/cpu.h>
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#include <linux/semaphore.h>
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#include <linux/oom.h>
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#include <linux/oprofile.h>
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2012-03-28 10:30:02 -07:00
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#include <asm/facility.h>
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2012-03-23 03:13:05 -07:00
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#include <asm/cpu_mf.h>
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2011-05-26 00:48:24 -07:00
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#include <asm/irq.h>
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2011-01-21 03:06:52 -07:00
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#include "hwsampler.h"
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2011-11-25 12:03:05 -07:00
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#include "op_counter.h"
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2011-01-21 03:06:52 -07:00
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#define MAX_NUM_SDB 511
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#define MIN_NUM_SDB 1
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#define ALERT_REQ_MASK 0x4000000000000000ul
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#define BUFFER_FULL_MASK 0x8000000000000000ul
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DECLARE_PER_CPU(struct hws_cpu_buffer, sampler_cpu_buffer);
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struct hws_execute_parms {
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void *buffer;
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signed int rc;
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};
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DEFINE_PER_CPU(struct hws_cpu_buffer, sampler_cpu_buffer);
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EXPORT_PER_CPU_SYMBOL(sampler_cpu_buffer);
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static DEFINE_MUTEX(hws_sem);
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static DEFINE_MUTEX(hws_sem_oom);
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static unsigned char hws_flush_all;
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static unsigned int hws_oom;
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static struct workqueue_struct *hws_wq;
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static unsigned int hws_state;
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enum {
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HWS_INIT = 1,
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HWS_DEALLOCATED,
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HWS_STOPPED,
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HWS_STARTED,
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HWS_STOPPING };
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/* set to 1 if called by kernel during memory allocation */
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static unsigned char oom_killer_was_active;
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/* size of SDBT and SDB as of allocate API */
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static unsigned long num_sdbt = 100;
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static unsigned long num_sdb = 511;
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/* sampling interval (machine cycles) */
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static unsigned long interval;
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static unsigned long min_sampler_rate;
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static unsigned long max_sampler_rate;
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static int ssctl(void *buffer)
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{
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int cc;
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/* set in order to detect a program check */
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cc = 1;
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asm volatile(
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"0: .insn s,0xB2870000,0(%1)\n"
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"1: ipm %0\n"
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" srl %0,28\n"
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"2:\n"
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EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
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: "+d" (cc), "+a" (buffer)
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: "m" (*((struct hws_ssctl_request_block *)buffer))
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: "cc", "memory");
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return cc ? -EINVAL : 0 ;
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}
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static int qsi(void *buffer)
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{
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int cc;
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cc = 1;
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asm volatile(
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"0: .insn s,0xB2860000,0(%1)\n"
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"1: lhi %0,0\n"
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"2:\n"
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EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
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: "=d" (cc), "+a" (buffer)
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: "m" (*((struct hws_qsi_info_block *)buffer))
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: "cc", "memory");
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return cc ? -EINVAL : 0;
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}
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static void execute_qsi(void *parms)
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{
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struct hws_execute_parms *ep = parms;
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ep->rc = qsi(ep->buffer);
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}
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static void execute_ssctl(void *parms)
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{
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struct hws_execute_parms *ep = parms;
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ep->rc = ssctl(ep->buffer);
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}
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static int smp_ctl_ssctl_stop(int cpu)
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{
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int rc;
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struct hws_execute_parms ep;
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struct hws_cpu_buffer *cb;
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cb = &per_cpu(sampler_cpu_buffer, cpu);
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cb->ssctl.es = 0;
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cb->ssctl.cs = 0;
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ep.buffer = &cb->ssctl;
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smp_call_function_single(cpu, execute_ssctl, &ep, 1);
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rc = ep.rc;
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if (rc) {
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printk(KERN_ERR "hwsampler: CPU %d CPUMF SSCTL failed.\n", cpu);
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dump_stack();
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}
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ep.buffer = &cb->qsi;
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smp_call_function_single(cpu, execute_qsi, &ep, 1);
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if (cb->qsi.es || cb->qsi.cs) {
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printk(KERN_EMERG "CPUMF sampling did not stop properly.\n");
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dump_stack();
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}
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return rc;
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}
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static int smp_ctl_ssctl_deactivate(int cpu)
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{
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int rc;
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struct hws_execute_parms ep;
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struct hws_cpu_buffer *cb;
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cb = &per_cpu(sampler_cpu_buffer, cpu);
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cb->ssctl.es = 1;
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cb->ssctl.cs = 0;
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ep.buffer = &cb->ssctl;
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smp_call_function_single(cpu, execute_ssctl, &ep, 1);
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rc = ep.rc;
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if (rc)
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printk(KERN_ERR "hwsampler: CPU %d CPUMF SSCTL failed.\n", cpu);
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ep.buffer = &cb->qsi;
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smp_call_function_single(cpu, execute_qsi, &ep, 1);
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if (cb->qsi.cs)
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printk(KERN_EMERG "CPUMF sampling was not set inactive.\n");
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return rc;
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}
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static int smp_ctl_ssctl_enable_activate(int cpu, unsigned long interval)
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{
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int rc;
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struct hws_execute_parms ep;
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struct hws_cpu_buffer *cb;
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cb = &per_cpu(sampler_cpu_buffer, cpu);
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cb->ssctl.h = 1;
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cb->ssctl.tear = cb->first_sdbt;
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cb->ssctl.dear = *(unsigned long *) cb->first_sdbt;
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cb->ssctl.interval = interval;
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cb->ssctl.es = 1;
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cb->ssctl.cs = 1;
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ep.buffer = &cb->ssctl;
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smp_call_function_single(cpu, execute_ssctl, &ep, 1);
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rc = ep.rc;
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if (rc)
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printk(KERN_ERR "hwsampler: CPU %d CPUMF SSCTL failed.\n", cpu);
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ep.buffer = &cb->qsi;
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smp_call_function_single(cpu, execute_qsi, &ep, 1);
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if (ep.rc)
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printk(KERN_ERR "hwsampler: CPU %d CPUMF QSI failed.\n", cpu);
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return rc;
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}
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static int smp_ctl_qsi(int cpu)
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{
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struct hws_execute_parms ep;
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struct hws_cpu_buffer *cb;
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cb = &per_cpu(sampler_cpu_buffer, cpu);
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ep.buffer = &cb->qsi;
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smp_call_function_single(cpu, execute_qsi, &ep, 1);
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return ep.rc;
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}
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static inline unsigned long *trailer_entry_ptr(unsigned long v)
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{
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void *ret;
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ret = (void *)v;
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ret += PAGE_SIZE;
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ret -= sizeof(struct hws_trailer_entry);
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return (unsigned long *) ret;
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}
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2012-03-11 08:59:31 -07:00
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static void hws_ext_handler(struct ext_code ext_code,
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2012-03-23 03:13:05 -07:00
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unsigned int param32, unsigned long param64)
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{
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struct hws_cpu_buffer *cb = &__get_cpu_var(sampler_cpu_buffer);
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if (!(param32 & CPU_MF_INT_SF_MASK))
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return;
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2012-05-09 07:27:40 -07:00
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kstat_cpu(smp_processor_id()).irqs[EXTINT_CMS]++;
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2012-03-23 03:13:05 -07:00
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atomic_xchg(&cb->ext_params, atomic_read(&cb->ext_params) | param32);
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if (hws_wq)
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queue_work(hws_wq, &cb->worker);
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}
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2011-01-21 03:06:52 -07:00
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static void worker(struct work_struct *work);
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static void add_samples_to_oprofile(unsigned cpu, unsigned long *,
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unsigned long *dear);
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static void init_all_cpu_buffers(void)
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{
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int cpu;
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struct hws_cpu_buffer *cb;
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for_each_online_cpu(cpu) {
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cb = &per_cpu(sampler_cpu_buffer, cpu);
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memset(cb, 0, sizeof(struct hws_cpu_buffer));
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}
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}
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static int is_link_entry(unsigned long *s)
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{
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return *s & 0x1ul ? 1 : 0;
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}
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static unsigned long *get_next_sdbt(unsigned long *s)
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{
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return (unsigned long *) (*s & ~0x1ul);
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}
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static int prepare_cpu_buffers(void)
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{
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int cpu;
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int rc;
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struct hws_cpu_buffer *cb;
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rc = 0;
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for_each_online_cpu(cpu) {
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cb = &per_cpu(sampler_cpu_buffer, cpu);
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atomic_set(&cb->ext_params, 0);
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cb->worker_entry = 0;
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cb->sample_overflow = 0;
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cb->req_alert = 0;
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cb->incorrect_sdbt_entry = 0;
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cb->invalid_entry_address = 0;
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cb->loss_of_sample_data = 0;
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cb->sample_auth_change_alert = 0;
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cb->finish = 0;
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cb->oom = 0;
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cb->stop_mode = 0;
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}
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return rc;
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}
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/*
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* allocate_sdbt() - allocate sampler memory
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* @cpu: the cpu for which sampler memory is allocated
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*
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* A 4K page is allocated for each requested SDBT.
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* A maximum of 511 4K pages are allocated for the SDBs in each of the SDBTs.
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* Set ALERT_REQ mask in each SDBs trailer.
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* Returns zero if successful, <0 otherwise.
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*/
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static int allocate_sdbt(int cpu)
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{
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int j, k, rc;
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unsigned long *sdbt;
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unsigned long sdb;
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unsigned long *tail;
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unsigned long *trailer;
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struct hws_cpu_buffer *cb;
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cb = &per_cpu(sampler_cpu_buffer, cpu);
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if (cb->first_sdbt)
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return -EINVAL;
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sdbt = NULL;
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tail = sdbt;
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for (j = 0; j < num_sdbt; j++) {
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sdbt = (unsigned long *)get_zeroed_page(GFP_KERNEL);
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mutex_lock(&hws_sem_oom);
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/* OOM killer might have been activated */
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barrier();
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if (oom_killer_was_active || !sdbt) {
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if (sdbt)
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free_page((unsigned long)sdbt);
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goto allocate_sdbt_error;
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}
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if (cb->first_sdbt == 0)
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cb->first_sdbt = (unsigned long)sdbt;
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/* link current page to tail of chain */
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if (tail)
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*tail = (unsigned long)(void *)sdbt + 1;
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mutex_unlock(&hws_sem_oom);
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for (k = 0; k < num_sdb; k++) {
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/* get and set SDB page */
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sdb = get_zeroed_page(GFP_KERNEL);
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mutex_lock(&hws_sem_oom);
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/* OOM killer might have been activated */
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barrier();
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if (oom_killer_was_active || !sdb) {
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if (sdb)
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free_page(sdb);
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goto allocate_sdbt_error;
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}
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*sdbt = sdb;
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trailer = trailer_entry_ptr(*sdbt);
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*trailer = ALERT_REQ_MASK;
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sdbt++;
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mutex_unlock(&hws_sem_oom);
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}
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tail = sdbt;
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}
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mutex_lock(&hws_sem_oom);
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if (oom_killer_was_active)
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goto allocate_sdbt_error;
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rc = 0;
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if (tail)
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*tail = (unsigned long)
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((void *)cb->first_sdbt) + 1;
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allocate_sdbt_exit:
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mutex_unlock(&hws_sem_oom);
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return rc;
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allocate_sdbt_error:
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rc = -ENOMEM;
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goto allocate_sdbt_exit;
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}
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/*
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* deallocate_sdbt() - deallocate all sampler memory
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*
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|
|
|
* For each online CPU all SDBT trees are deallocated.
|
|
|
|
* Returns the number of freed pages.
|
|
|
|
*/
|
|
|
|
static int deallocate_sdbt(void)
|
|
|
|
{
|
|
|
|
int cpu;
|
|
|
|
int counter;
|
|
|
|
|
|
|
|
counter = 0;
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
unsigned long start;
|
|
|
|
unsigned long sdbt;
|
|
|
|
unsigned long *curr;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
|
|
|
|
if (!cb->first_sdbt)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
sdbt = cb->first_sdbt;
|
|
|
|
curr = (unsigned long *) sdbt;
|
|
|
|
start = sdbt;
|
|
|
|
|
|
|
|
/* we'll free the SDBT after all SDBs are processed... */
|
|
|
|
while (1) {
|
|
|
|
if (!*curr || !sdbt)
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* watch for link entry reset if found */
|
|
|
|
if (is_link_entry(curr)) {
|
|
|
|
curr = get_next_sdbt(curr);
|
|
|
|
if (sdbt)
|
|
|
|
free_page(sdbt);
|
|
|
|
|
|
|
|
/* we are done if we reach the start */
|
|
|
|
if ((unsigned long) curr == start)
|
|
|
|
break;
|
|
|
|
else
|
|
|
|
sdbt = (unsigned long) curr;
|
|
|
|
} else {
|
|
|
|
/* process SDB pointer */
|
|
|
|
if (*curr) {
|
|
|
|
free_page(*curr);
|
|
|
|
curr++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
counter++;
|
|
|
|
}
|
|
|
|
cb->first_sdbt = 0;
|
|
|
|
}
|
|
|
|
return counter;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int start_sampling(int cpu)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
rc = smp_ctl_ssctl_enable_activate(cpu, interval);
|
|
|
|
if (rc) {
|
|
|
|
printk(KERN_INFO "hwsampler: CPU %d ssctl failed.\n", cpu);
|
|
|
|
goto start_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
if (!cb->qsi.es) {
|
|
|
|
printk(KERN_INFO "hwsampler: CPU %d ssctl not enabled.\n", cpu);
|
|
|
|
goto start_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!cb->qsi.cs) {
|
|
|
|
printk(KERN_INFO "hwsampler: CPU %d ssctl not active.\n", cpu);
|
|
|
|
goto start_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(KERN_INFO
|
|
|
|
"hwsampler: CPU %d, CPUMF Sampling started, interval %lu.\n",
|
|
|
|
cpu, interval);
|
|
|
|
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
start_exit:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int stop_sampling(int cpu)
|
|
|
|
{
|
|
|
|
unsigned long v;
|
|
|
|
int rc;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
rc = smp_ctl_qsi(cpu);
|
|
|
|
WARN_ON(rc);
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
if (!rc && !cb->qsi.es)
|
|
|
|
printk(KERN_INFO "hwsampler: CPU %d, already stopped.\n", cpu);
|
|
|
|
|
|
|
|
rc = smp_ctl_ssctl_stop(cpu);
|
|
|
|
if (rc) {
|
|
|
|
printk(KERN_INFO "hwsampler: CPU %d, ssctl stop error %d.\n",
|
|
|
|
cpu, rc);
|
|
|
|
goto stop_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(KERN_INFO "hwsampler: CPU %d, CPUMF Sampling stopped.\n", cpu);
|
|
|
|
|
|
|
|
stop_exit:
|
|
|
|
v = cb->req_alert;
|
|
|
|
if (v)
|
|
|
|
printk(KERN_ERR "hwsampler: CPU %d CPUMF Request alert,"
|
|
|
|
" count=%lu.\n", cpu, v);
|
|
|
|
|
|
|
|
v = cb->loss_of_sample_data;
|
|
|
|
if (v)
|
|
|
|
printk(KERN_ERR "hwsampler: CPU %d CPUMF Loss of sample data,"
|
|
|
|
" count=%lu.\n", cpu, v);
|
|
|
|
|
|
|
|
v = cb->invalid_entry_address;
|
|
|
|
if (v)
|
|
|
|
printk(KERN_ERR "hwsampler: CPU %d CPUMF Invalid entry address,"
|
|
|
|
" count=%lu.\n", cpu, v);
|
|
|
|
|
|
|
|
v = cb->incorrect_sdbt_entry;
|
|
|
|
if (v)
|
|
|
|
printk(KERN_ERR
|
|
|
|
"hwsampler: CPU %d CPUMF Incorrect SDBT address,"
|
|
|
|
" count=%lu.\n", cpu, v);
|
|
|
|
|
|
|
|
v = cb->sample_auth_change_alert;
|
|
|
|
if (v)
|
|
|
|
printk(KERN_ERR
|
|
|
|
"hwsampler: CPU %d CPUMF Sample authorization change,"
|
|
|
|
" count=%lu.\n", cpu, v);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int check_hardware_prerequisites(void)
|
|
|
|
{
|
2011-04-04 00:43:29 -07:00
|
|
|
if (!test_facility(68))
|
2011-01-21 03:06:52 -07:00
|
|
|
return -EOPNOTSUPP;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* hws_oom_callback() - the OOM callback function
|
|
|
|
*
|
|
|
|
* In case the callback is invoked during memory allocation for the
|
|
|
|
* hw sampler, all obtained memory is deallocated and a flag is set
|
|
|
|
* so main sampler memory allocation can exit with a failure code.
|
|
|
|
* In case the callback is invoked during sampling the hw sampler
|
|
|
|
* is deactivated for all CPUs.
|
|
|
|
*/
|
|
|
|
static int hws_oom_callback(struct notifier_block *nfb,
|
|
|
|
unsigned long dummy, void *parm)
|
|
|
|
{
|
|
|
|
unsigned long *freed;
|
|
|
|
int cpu;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
freed = parm;
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem_oom);
|
|
|
|
|
|
|
|
if (hws_state == HWS_DEALLOCATED) {
|
|
|
|
/* during memory allocation */
|
|
|
|
if (oom_killer_was_active == 0) {
|
|
|
|
oom_killer_was_active = 1;
|
|
|
|
*freed += deallocate_sdbt();
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
int i;
|
|
|
|
cpu = get_cpu();
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
|
|
|
|
if (!cb->oom) {
|
|
|
|
for_each_online_cpu(i) {
|
|
|
|
smp_ctl_ssctl_deactivate(i);
|
|
|
|
cb->oom = 1;
|
|
|
|
}
|
|
|
|
cb->finish = 1;
|
|
|
|
|
|
|
|
printk(KERN_INFO
|
|
|
|
"hwsampler: CPU %d, OOM notify during CPUMF Sampling.\n",
|
|
|
|
cpu);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_unlock(&hws_sem_oom);
|
|
|
|
|
|
|
|
return NOTIFY_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block hws_oom_notifier = {
|
|
|
|
.notifier_call = hws_oom_callback
|
|
|
|
};
|
|
|
|
|
2011-02-14 11:08:33 -07:00
|
|
|
static int hws_cpu_callback(struct notifier_block *nfb,
|
2011-01-21 03:06:52 -07:00
|
|
|
unsigned long action, void *hcpu)
|
|
|
|
{
|
|
|
|
/* We do not have sampler space available for all possible CPUs.
|
|
|
|
All CPUs should be online when hw sampling is activated. */
|
2011-05-26 00:48:26 -07:00
|
|
|
return (hws_state <= HWS_DEALLOCATED) ? NOTIFY_OK : NOTIFY_BAD;
|
2011-01-21 03:06:52 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block hws_cpu_notifier = {
|
|
|
|
.notifier_call = hws_cpu_callback
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* hwsampler_deactivate() - set hardware sampling temporarily inactive
|
|
|
|
* @cpu: specifies the CPU to be set inactive.
|
|
|
|
*
|
|
|
|
* Returns 0 on success, !0 on failure.
|
|
|
|
*/
|
|
|
|
int hwsampler_deactivate(unsigned int cpu)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Deactivate hw sampling temporarily and flush the buffer
|
|
|
|
* by pushing all the pending samples to oprofile buffer.
|
|
|
|
*
|
|
|
|
* This function can be called under one of the following conditions:
|
|
|
|
* Memory unmap, task is exiting.
|
|
|
|
*/
|
|
|
|
int rc;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
rc = 0;
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
if (hws_state == HWS_STARTED) {
|
|
|
|
rc = smp_ctl_qsi(cpu);
|
|
|
|
WARN_ON(rc);
|
|
|
|
if (cb->qsi.cs) {
|
|
|
|
rc = smp_ctl_ssctl_deactivate(cpu);
|
|
|
|
if (rc) {
|
|
|
|
printk(KERN_INFO
|
|
|
|
"hwsampler: CPU %d, CPUMF Deactivation failed.\n", cpu);
|
|
|
|
cb->finish = 1;
|
|
|
|
hws_state = HWS_STOPPING;
|
|
|
|
} else {
|
|
|
|
hws_flush_all = 1;
|
|
|
|
/* Add work to queue to read pending samples.*/
|
|
|
|
queue_work_on(cpu, hws_wq, &cb->worker);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
|
|
|
|
if (hws_wq)
|
|
|
|
flush_workqueue(hws_wq);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* hwsampler_activate() - activate/resume hardware sampling which was deactivated
|
|
|
|
* @cpu: specifies the CPU to be set active.
|
|
|
|
*
|
|
|
|
* Returns 0 on success, !0 on failure.
|
|
|
|
*/
|
|
|
|
int hwsampler_activate(unsigned int cpu)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Re-activate hw sampling. This should be called in pair with
|
|
|
|
* hwsampler_deactivate().
|
|
|
|
*/
|
|
|
|
int rc;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
rc = 0;
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
if (hws_state == HWS_STARTED) {
|
|
|
|
rc = smp_ctl_qsi(cpu);
|
|
|
|
WARN_ON(rc);
|
|
|
|
if (!cb->qsi.cs) {
|
|
|
|
hws_flush_all = 0;
|
|
|
|
rc = smp_ctl_ssctl_enable_activate(cpu, interval);
|
|
|
|
if (rc) {
|
|
|
|
printk(KERN_ERR
|
|
|
|
"CPU %d, CPUMF activate sampling failed.\n",
|
|
|
|
cpu);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int check_qsi_on_setup(void)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
unsigned int cpu;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
rc = smp_ctl_qsi(cpu);
|
|
|
|
WARN_ON(rc);
|
|
|
|
if (rc)
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
|
|
|
if (!cb->qsi.as) {
|
|
|
|
printk(KERN_INFO "hwsampler: CPUMF sampling is not authorized.\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (cb->qsi.es) {
|
|
|
|
printk(KERN_WARNING "hwsampler: CPUMF is still enabled.\n");
|
|
|
|
rc = smp_ctl_ssctl_stop(cpu);
|
|
|
|
if (rc)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
printk(KERN_INFO
|
|
|
|
"CPU %d, CPUMF Sampling stopped now.\n", cpu);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int check_qsi_on_start(void)
|
|
|
|
{
|
|
|
|
unsigned int cpu;
|
|
|
|
int rc;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
rc = smp_ctl_qsi(cpu);
|
|
|
|
WARN_ON(rc);
|
|
|
|
|
|
|
|
if (!cb->qsi.as)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (cb->qsi.es)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (cb->qsi.cs)
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void worker_on_start(unsigned int cpu)
|
|
|
|
{
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
cb->worker_entry = cb->first_sdbt;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int worker_check_error(unsigned int cpu, int ext_params)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
unsigned long *sdbt;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
rc = 0;
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
sdbt = (unsigned long *) cb->worker_entry;
|
|
|
|
|
|
|
|
if (!sdbt || !*sdbt)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2012-03-23 03:13:05 -07:00
|
|
|
if (ext_params & CPU_MF_INT_SF_PRA)
|
2011-01-21 03:06:52 -07:00
|
|
|
cb->req_alert++;
|
|
|
|
|
2012-03-23 03:13:05 -07:00
|
|
|
if (ext_params & CPU_MF_INT_SF_LSDA)
|
2011-01-21 03:06:52 -07:00
|
|
|
cb->loss_of_sample_data++;
|
|
|
|
|
2012-03-23 03:13:05 -07:00
|
|
|
if (ext_params & CPU_MF_INT_SF_IAE) {
|
2011-01-21 03:06:52 -07:00
|
|
|
cb->invalid_entry_address++;
|
|
|
|
rc = -EINVAL;
|
|
|
|
}
|
|
|
|
|
2012-03-23 03:13:05 -07:00
|
|
|
if (ext_params & CPU_MF_INT_SF_ISE) {
|
2011-01-21 03:06:52 -07:00
|
|
|
cb->incorrect_sdbt_entry++;
|
|
|
|
rc = -EINVAL;
|
|
|
|
}
|
|
|
|
|
2012-03-23 03:13:05 -07:00
|
|
|
if (ext_params & CPU_MF_INT_SF_SACA) {
|
2011-01-21 03:06:52 -07:00
|
|
|
cb->sample_auth_change_alert++;
|
|
|
|
rc = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void worker_on_finish(unsigned int cpu)
|
|
|
|
{
|
|
|
|
int rc, i;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
|
|
|
|
if (cb->finish) {
|
|
|
|
rc = smp_ctl_qsi(cpu);
|
|
|
|
WARN_ON(rc);
|
|
|
|
if (cb->qsi.es) {
|
|
|
|
printk(KERN_INFO
|
|
|
|
"hwsampler: CPU %d, CPUMF Stop/Deactivate sampling.\n",
|
|
|
|
cpu);
|
|
|
|
rc = smp_ctl_ssctl_stop(cpu);
|
|
|
|
if (rc)
|
|
|
|
printk(KERN_INFO
|
|
|
|
"hwsampler: CPU %d, CPUMF Deactivation failed.\n",
|
|
|
|
cpu);
|
|
|
|
|
|
|
|
for_each_online_cpu(i) {
|
|
|
|
if (i == cpu)
|
|
|
|
continue;
|
|
|
|
if (!cb->finish) {
|
|
|
|
cb->finish = 1;
|
|
|
|
queue_work_on(i, hws_wq,
|
|
|
|
&cb->worker);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void worker_on_interrupt(unsigned int cpu)
|
|
|
|
{
|
|
|
|
unsigned long *sdbt;
|
|
|
|
unsigned char done;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
|
|
|
|
sdbt = (unsigned long *) cb->worker_entry;
|
|
|
|
|
|
|
|
done = 0;
|
|
|
|
/* do not proceed if stop was entered,
|
|
|
|
* forget the buffers not yet processed */
|
|
|
|
while (!done && !cb->stop_mode) {
|
|
|
|
unsigned long *trailer;
|
|
|
|
struct hws_trailer_entry *te;
|
|
|
|
unsigned long *dear = 0;
|
|
|
|
|
|
|
|
trailer = trailer_entry_ptr(*sdbt);
|
|
|
|
/* leave loop if no more work to do */
|
|
|
|
if (!(*trailer & BUFFER_FULL_MASK)) {
|
|
|
|
done = 1;
|
|
|
|
if (!hws_flush_all)
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
te = (struct hws_trailer_entry *)trailer;
|
|
|
|
cb->sample_overflow += te->overflow;
|
|
|
|
|
|
|
|
add_samples_to_oprofile(cpu, sdbt, dear);
|
|
|
|
|
|
|
|
/* reset trailer */
|
|
|
|
xchg((unsigned char *) te, 0x40);
|
|
|
|
|
|
|
|
/* advance to next sdb slot in current sdbt */
|
|
|
|
sdbt++;
|
|
|
|
/* in case link bit is set use address w/o link bit */
|
|
|
|
if (is_link_entry(sdbt))
|
|
|
|
sdbt = get_next_sdbt(sdbt);
|
|
|
|
|
|
|
|
cb->worker_entry = (unsigned long)sdbt;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void add_samples_to_oprofile(unsigned int cpu, unsigned long *sdbt,
|
|
|
|
unsigned long *dear)
|
|
|
|
{
|
|
|
|
struct hws_data_entry *sample_data_ptr;
|
|
|
|
unsigned long *trailer;
|
|
|
|
|
|
|
|
trailer = trailer_entry_ptr(*sdbt);
|
|
|
|
if (dear) {
|
|
|
|
if (dear > trailer)
|
|
|
|
return;
|
|
|
|
trailer = dear;
|
|
|
|
}
|
|
|
|
|
|
|
|
sample_data_ptr = (struct hws_data_entry *)(*sdbt);
|
|
|
|
|
|
|
|
while ((unsigned long *)sample_data_ptr < trailer) {
|
|
|
|
struct pt_regs *regs = NULL;
|
|
|
|
struct task_struct *tsk = NULL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check sampling mode, 1 indicates basic (=customer) sampling
|
|
|
|
* mode.
|
|
|
|
*/
|
|
|
|
if (sample_data_ptr->def != 1) {
|
|
|
|
/* sample slot is not yet written */
|
|
|
|
break;
|
|
|
|
} else {
|
|
|
|
/* make sure we don't use it twice,
|
|
|
|
* the next time the sampler will set it again */
|
|
|
|
sample_data_ptr->def = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Get pt_regs. */
|
|
|
|
if (sample_data_ptr->P == 1) {
|
|
|
|
/* userspace sample */
|
|
|
|
unsigned int pid = sample_data_ptr->prim_asn;
|
2011-11-25 12:03:05 -07:00
|
|
|
if (!counter_config.user)
|
|
|
|
goto skip_sample;
|
2011-01-21 03:06:52 -07:00
|
|
|
rcu_read_lock();
|
|
|
|
tsk = pid_task(find_vpid(pid), PIDTYPE_PID);
|
|
|
|
if (tsk)
|
|
|
|
regs = task_pt_regs(tsk);
|
|
|
|
rcu_read_unlock();
|
|
|
|
} else {
|
|
|
|
/* kernelspace sample */
|
2011-11-25 12:03:05 -07:00
|
|
|
if (!counter_config.kernel)
|
|
|
|
goto skip_sample;
|
2011-01-21 03:06:52 -07:00
|
|
|
regs = task_pt_regs(current);
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
oprofile_add_ext_hw_sample(sample_data_ptr->ia, regs, 0,
|
|
|
|
!sample_data_ptr->P, tsk);
|
|
|
|
mutex_unlock(&hws_sem);
|
2011-11-25 12:03:05 -07:00
|
|
|
skip_sample:
|
2011-01-21 03:06:52 -07:00
|
|
|
sample_data_ptr++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void worker(struct work_struct *work)
|
|
|
|
{
|
|
|
|
unsigned int cpu;
|
|
|
|
int ext_params;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
cb = container_of(work, struct hws_cpu_buffer, worker);
|
|
|
|
cpu = smp_processor_id();
|
|
|
|
ext_params = atomic_xchg(&cb->ext_params, 0);
|
|
|
|
|
|
|
|
if (!cb->worker_entry)
|
|
|
|
worker_on_start(cpu);
|
|
|
|
|
|
|
|
if (worker_check_error(cpu, ext_params))
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (!cb->finish)
|
|
|
|
worker_on_interrupt(cpu);
|
|
|
|
|
|
|
|
if (cb->finish)
|
|
|
|
worker_on_finish(cpu);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* hwsampler_allocate() - allocate memory for the hardware sampler
|
|
|
|
* @sdbt: number of SDBTs per online CPU (must be > 0)
|
|
|
|
* @sdb: number of SDBs per SDBT (minimum 1, maximum 511)
|
|
|
|
*
|
|
|
|
* Returns 0 on success, !0 on failure.
|
|
|
|
*/
|
|
|
|
int hwsampler_allocate(unsigned long sdbt, unsigned long sdb)
|
|
|
|
{
|
|
|
|
int cpu, rc;
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
if (hws_state != HWS_DEALLOCATED)
|
|
|
|
goto allocate_exit;
|
|
|
|
|
|
|
|
if (sdbt < 1)
|
|
|
|
goto allocate_exit;
|
|
|
|
|
|
|
|
if (sdb > MAX_NUM_SDB || sdb < MIN_NUM_SDB)
|
|
|
|
goto allocate_exit;
|
|
|
|
|
|
|
|
num_sdbt = sdbt;
|
|
|
|
num_sdb = sdb;
|
|
|
|
|
|
|
|
oom_killer_was_active = 0;
|
|
|
|
register_oom_notifier(&hws_oom_notifier);
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
if (allocate_sdbt(cpu)) {
|
|
|
|
unregister_oom_notifier(&hws_oom_notifier);
|
|
|
|
goto allocate_error;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
unregister_oom_notifier(&hws_oom_notifier);
|
|
|
|
if (oom_killer_was_active)
|
|
|
|
goto allocate_error;
|
|
|
|
|
|
|
|
hws_state = HWS_STOPPED;
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
allocate_exit:
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
allocate_error:
|
|
|
|
rc = -ENOMEM;
|
|
|
|
printk(KERN_ERR "hwsampler: CPUMF Memory allocation failed.\n");
|
|
|
|
goto allocate_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* hwsampler_deallocate() - deallocate hardware sampler memory
|
|
|
|
*
|
|
|
|
* Returns 0 on success, !0 on failure.
|
|
|
|
*/
|
2011-10-30 07:17:12 -07:00
|
|
|
int hwsampler_deallocate(void)
|
2011-01-21 03:06:52 -07:00
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
if (hws_state != HWS_STOPPED)
|
|
|
|
goto deallocate_exit;
|
|
|
|
|
2012-03-23 03:13:05 -07:00
|
|
|
measurement_alert_subclass_unregister();
|
2011-01-21 03:06:52 -07:00
|
|
|
deallocate_sdbt();
|
|
|
|
|
|
|
|
hws_state = HWS_DEALLOCATED;
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
deallocate_exit:
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2011-05-10 08:13:42 -07:00
|
|
|
unsigned long hwsampler_query_min_interval(void)
|
2011-01-21 03:06:52 -07:00
|
|
|
{
|
2011-05-10 08:13:42 -07:00
|
|
|
return min_sampler_rate;
|
2011-01-21 03:06:52 -07:00
|
|
|
}
|
|
|
|
|
2011-05-10 08:13:42 -07:00
|
|
|
unsigned long hwsampler_query_max_interval(void)
|
2011-01-21 03:06:52 -07:00
|
|
|
{
|
2011-05-10 08:13:42 -07:00
|
|
|
return max_sampler_rate;
|
2011-01-21 03:06:52 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
unsigned long hwsampler_get_sample_overflow_count(unsigned int cpu)
|
|
|
|
{
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
|
|
|
|
return cb->sample_overflow;
|
|
|
|
}
|
|
|
|
|
2011-10-30 07:17:12 -07:00
|
|
|
int hwsampler_setup(void)
|
2011-01-21 03:06:52 -07:00
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
int cpu;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
if (hws_state)
|
|
|
|
goto setup_exit;
|
|
|
|
|
|
|
|
hws_state = HWS_INIT;
|
|
|
|
|
|
|
|
init_all_cpu_buffers();
|
|
|
|
|
|
|
|
rc = check_hardware_prerequisites();
|
|
|
|
if (rc)
|
|
|
|
goto setup_exit;
|
|
|
|
|
|
|
|
rc = check_qsi_on_setup();
|
|
|
|
if (rc)
|
|
|
|
goto setup_exit;
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
hws_wq = create_workqueue("hwsampler");
|
|
|
|
if (!hws_wq)
|
|
|
|
goto setup_exit;
|
|
|
|
|
|
|
|
register_cpu_notifier(&hws_cpu_notifier);
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
INIT_WORK(&cb->worker, worker);
|
|
|
|
rc = smp_ctl_qsi(cpu);
|
|
|
|
WARN_ON(rc);
|
|
|
|
if (min_sampler_rate != cb->qsi.min_sampl_rate) {
|
|
|
|
if (min_sampler_rate) {
|
|
|
|
printk(KERN_WARNING
|
|
|
|
"hwsampler: different min sampler rate values.\n");
|
|
|
|
if (min_sampler_rate < cb->qsi.min_sampl_rate)
|
|
|
|
min_sampler_rate =
|
|
|
|
cb->qsi.min_sampl_rate;
|
|
|
|
} else
|
|
|
|
min_sampler_rate = cb->qsi.min_sampl_rate;
|
|
|
|
}
|
|
|
|
if (max_sampler_rate != cb->qsi.max_sampl_rate) {
|
|
|
|
if (max_sampler_rate) {
|
|
|
|
printk(KERN_WARNING
|
|
|
|
"hwsampler: different max sampler rate values.\n");
|
|
|
|
if (max_sampler_rate > cb->qsi.max_sampl_rate)
|
|
|
|
max_sampler_rate =
|
|
|
|
cb->qsi.max_sampl_rate;
|
|
|
|
} else
|
|
|
|
max_sampler_rate = cb->qsi.max_sampl_rate;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
register_external_interrupt(0x1407, hws_ext_handler);
|
|
|
|
|
|
|
|
hws_state = HWS_DEALLOCATED;
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
setup_exit:
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2011-10-30 07:17:12 -07:00
|
|
|
int hwsampler_shutdown(void)
|
2011-01-21 03:06:52 -07:00
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
if (hws_state == HWS_DEALLOCATED || hws_state == HWS_STOPPED) {
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
|
|
|
|
if (hws_wq)
|
|
|
|
flush_workqueue(hws_wq);
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
if (hws_state == HWS_STOPPED) {
|
2012-03-23 03:13:05 -07:00
|
|
|
measurement_alert_subclass_unregister();
|
2011-01-21 03:06:52 -07:00
|
|
|
deallocate_sdbt();
|
|
|
|
}
|
|
|
|
if (hws_wq) {
|
|
|
|
destroy_workqueue(hws_wq);
|
|
|
|
hws_wq = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
unregister_external_interrupt(0x1407, hws_ext_handler);
|
|
|
|
hws_state = HWS_INIT;
|
|
|
|
rc = 0;
|
|
|
|
}
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
|
|
|
|
unregister_cpu_notifier(&hws_cpu_notifier);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* hwsampler_start_all() - start hardware sampling on all online CPUs
|
|
|
|
* @rate: specifies the used interval when samples are taken
|
|
|
|
*
|
|
|
|
* Returns 0 on success, !0 on failure.
|
|
|
|
*/
|
|
|
|
int hwsampler_start_all(unsigned long rate)
|
|
|
|
{
|
|
|
|
int rc, cpu;
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
hws_oom = 0;
|
|
|
|
|
|
|
|
rc = -EINVAL;
|
|
|
|
if (hws_state != HWS_STOPPED)
|
|
|
|
goto start_all_exit;
|
|
|
|
|
|
|
|
interval = rate;
|
|
|
|
|
|
|
|
/* fail if rate is not valid */
|
|
|
|
if (interval < min_sampler_rate || interval > max_sampler_rate)
|
|
|
|
goto start_all_exit;
|
|
|
|
|
|
|
|
rc = check_qsi_on_start();
|
|
|
|
if (rc)
|
|
|
|
goto start_all_exit;
|
|
|
|
|
|
|
|
rc = prepare_cpu_buffers();
|
|
|
|
if (rc)
|
|
|
|
goto start_all_exit;
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
rc = start_sampling(cpu);
|
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (rc) {
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
stop_sampling(cpu);
|
|
|
|
}
|
|
|
|
goto start_all_exit;
|
|
|
|
}
|
|
|
|
hws_state = HWS_STARTED;
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
start_all_exit:
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
register_oom_notifier(&hws_oom_notifier);
|
|
|
|
hws_oom = 1;
|
|
|
|
hws_flush_all = 0;
|
|
|
|
/* now let them in, 1407 CPUMF external interrupts */
|
2012-03-23 03:13:05 -07:00
|
|
|
measurement_alert_subclass_register();
|
2011-01-21 03:06:52 -07:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* hwsampler_stop_all() - stop hardware sampling on all online CPUs
|
|
|
|
*
|
|
|
|
* Returns 0 on success, !0 on failure.
|
|
|
|
*/
|
2011-10-30 07:17:12 -07:00
|
|
|
int hwsampler_stop_all(void)
|
2011-01-21 03:06:52 -07:00
|
|
|
{
|
|
|
|
int tmp_rc, rc, cpu;
|
|
|
|
struct hws_cpu_buffer *cb;
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
|
|
|
|
rc = 0;
|
|
|
|
if (hws_state == HWS_INIT) {
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
hws_state = HWS_STOPPING;
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
cb = &per_cpu(sampler_cpu_buffer, cpu);
|
|
|
|
cb->stop_mode = 1;
|
|
|
|
tmp_rc = stop_sampling(cpu);
|
|
|
|
if (tmp_rc)
|
|
|
|
rc = tmp_rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (hws_wq)
|
|
|
|
flush_workqueue(hws_wq);
|
|
|
|
|
|
|
|
mutex_lock(&hws_sem);
|
|
|
|
if (hws_oom) {
|
|
|
|
unregister_oom_notifier(&hws_oom_notifier);
|
|
|
|
hws_oom = 0;
|
|
|
|
}
|
|
|
|
hws_state = HWS_STOPPED;
|
|
|
|
mutex_unlock(&hws_sem);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|