forked from Minki/linux
Merge branch 'for-tip' of git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile into perf/core
This commit is contained in:
Ingo Molnar
commit
124ba94033
@ -1888,6 +1888,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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timer: [X86] Force use of architectural NMI
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timer mode (see also oprofile.timer
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for generic hr timer mode)
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[s390] Force legacy basic mode sampling
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(report cpu_type "timer")
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oops=panic Always panic on oopses. Default is to just kill the
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process, but there is a small probability of
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@ -22,6 +22,7 @@
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#include <asm/irq.h>
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#include "hwsampler.h"
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#include "op_counter.h"
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#define MAX_NUM_SDB 511
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#define MIN_NUM_SDB 1
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@ -896,6 +897,8 @@ static void add_samples_to_oprofile(unsigned int cpu, unsigned long *sdbt,
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if (sample_data_ptr->P == 1) {
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/* userspace sample */
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unsigned int pid = sample_data_ptr->prim_asn;
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if (!counter_config.user)
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goto skip_sample;
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rcu_read_lock();
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tsk = pid_task(find_vpid(pid), PIDTYPE_PID);
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if (tsk)
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@ -903,6 +906,8 @@ static void add_samples_to_oprofile(unsigned int cpu, unsigned long *sdbt,
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rcu_read_unlock();
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} else {
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/* kernelspace sample */
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if (!counter_config.kernel)
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goto skip_sample;
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regs = task_pt_regs(current);
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}
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@ -910,7 +915,7 @@ static void add_samples_to_oprofile(unsigned int cpu, unsigned long *sdbt,
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oprofile_add_ext_hw_sample(sample_data_ptr->ia, regs, 0,
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!sample_data_ptr->P, tsk);
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mutex_unlock(&hws_sem);
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skip_sample:
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sample_data_ptr++;
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}
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}
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@ -2,10 +2,11 @@
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* arch/s390/oprofile/init.c
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*
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* S390 Version
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* Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Copyright (C) 2002-2011 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Thomas Spatzier (tspat@de.ibm.com)
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* Author(s): Mahesh Salgaonkar (mahesh@linux.vnet.ibm.com)
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* Author(s): Heinz Graalfs (graalfs@linux.vnet.ibm.com)
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* Author(s): Andreas Krebbel (krebbel@linux.vnet.ibm.com)
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*
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* @remark Copyright 2002-2011 OProfile authors
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*/
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@ -14,6 +15,8 @@
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <asm/processor.h>
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#include "../../../drivers/oprofile/oprof.h"
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@ -22,6 +25,7 @@ extern void s390_backtrace(struct pt_regs * const regs, unsigned int depth);
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#ifdef CONFIG_64BIT
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#include "hwsampler.h"
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#include "op_counter.h"
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#define DEFAULT_INTERVAL 4127518
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@ -35,16 +39,41 @@ static unsigned long oprofile_max_interval;
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static unsigned long oprofile_sdbt_blocks = DEFAULT_SDBT_BLOCKS;
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static unsigned long oprofile_sdb_blocks = DEFAULT_SDB_BLOCKS;
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static int hwsampler_file;
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static int hwsampler_enabled;
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static int hwsampler_running; /* start_mutex must be held to change */
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static int hwsampler_available;
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static struct oprofile_operations timer_ops;
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struct op_counter_config counter_config;
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enum __force_cpu_type {
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reserved = 0, /* do not force */
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timer,
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};
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static int force_cpu_type;
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static int set_cpu_type(const char *str, struct kernel_param *kp)
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{
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if (!strcmp(str, "timer")) {
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force_cpu_type = timer;
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printk(KERN_INFO "oprofile: forcing timer to be returned "
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"as cpu type\n");
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} else {
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force_cpu_type = 0;
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}
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return 0;
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}
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module_param_call(cpu_type, set_cpu_type, NULL, NULL, 0);
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MODULE_PARM_DESC(cpu_type, "Force legacy basic mode sampling"
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"(report cpu_type \"timer\"");
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static int oprofile_hwsampler_start(void)
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{
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int retval;
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hwsampler_running = hwsampler_file;
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hwsampler_running = hwsampler_enabled;
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if (!hwsampler_running)
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return timer_ops.start();
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@ -72,10 +101,16 @@ static void oprofile_hwsampler_stop(void)
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return;
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}
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/*
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* File ops used for:
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* /dev/oprofile/0/enabled
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* /dev/oprofile/hwsampling/hwsampler (cpu_type = timer)
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*/
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static ssize_t hwsampler_read(struct file *file, char __user *buf,
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size_t count, loff_t *offset)
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{
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return oprofilefs_ulong_to_user(hwsampler_file, buf, count, offset);
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return oprofilefs_ulong_to_user(hwsampler_enabled, buf, count, offset);
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}
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static ssize_t hwsampler_write(struct file *file, char const __user *buf,
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@ -91,6 +126,9 @@ static ssize_t hwsampler_write(struct file *file, char const __user *buf,
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if (retval)
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return retval;
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if (val != 0 && val != 1)
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return -EINVAL;
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if (oprofile_started)
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/*
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* save to do without locking as we set
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@ -99,7 +137,7 @@ static ssize_t hwsampler_write(struct file *file, char const __user *buf,
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*/
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return -EBUSY;
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hwsampler_file = val;
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hwsampler_enabled = val;
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return count;
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}
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@ -109,38 +147,311 @@ static const struct file_operations hwsampler_fops = {
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.write = hwsampler_write,
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};
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static int oprofile_create_hwsampling_files(struct super_block *sb,
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struct dentry *root)
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/*
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* File ops used for:
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* /dev/oprofile/0/count
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* /dev/oprofile/hwsampling/hw_interval (cpu_type = timer)
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*
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* Make sure that the value is within the hardware range.
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*/
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static ssize_t hw_interval_read(struct file *file, char __user *buf,
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size_t count, loff_t *offset)
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{
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struct dentry *hw_dir;
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return oprofilefs_ulong_to_user(oprofile_hw_interval, buf,
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count, offset);
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}
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/* reinitialize default values */
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hwsampler_file = 1;
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static ssize_t hw_interval_write(struct file *file, char const __user *buf,
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size_t count, loff_t *offset)
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{
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unsigned long val;
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int retval;
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hw_dir = oprofilefs_mkdir(sb, root, "hwsampling");
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if (!hw_dir)
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if (*offset)
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return -EINVAL;
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retval = oprofilefs_ulong_from_user(&val, buf, count);
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if (retval)
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return retval;
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if (val < oprofile_min_interval)
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oprofile_hw_interval = oprofile_min_interval;
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else if (val > oprofile_max_interval)
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oprofile_hw_interval = oprofile_max_interval;
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else
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oprofile_hw_interval = val;
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return count;
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}
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static const struct file_operations hw_interval_fops = {
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.read = hw_interval_read,
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.write = hw_interval_write,
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};
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/*
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* File ops used for:
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* /dev/oprofile/0/event
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* Only a single event with number 0 is supported with this counter.
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*
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* /dev/oprofile/0/unit_mask
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* This is a dummy file needed by the user space tools.
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* No value other than 0 is accepted or returned.
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*/
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static ssize_t hwsampler_zero_read(struct file *file, char __user *buf,
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size_t count, loff_t *offset)
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{
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return oprofilefs_ulong_to_user(0, buf, count, offset);
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}
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static ssize_t hwsampler_zero_write(struct file *file, char const __user *buf,
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size_t count, loff_t *offset)
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{
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unsigned long val;
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int retval;
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if (*offset)
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return -EINVAL;
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oprofilefs_create_file(sb, hw_dir, "hwsampler", &hwsampler_fops);
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oprofilefs_create_ulong(sb, hw_dir, "hw_interval",
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&oprofile_hw_interval);
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oprofilefs_create_ro_ulong(sb, hw_dir, "hw_min_interval",
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&oprofile_min_interval);
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oprofilefs_create_ro_ulong(sb, hw_dir, "hw_max_interval",
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&oprofile_max_interval);
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oprofilefs_create_ulong(sb, hw_dir, "hw_sdbt_blocks",
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&oprofile_sdbt_blocks);
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retval = oprofilefs_ulong_from_user(&val, buf, count);
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if (retval)
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return retval;
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if (val != 0)
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return -EINVAL;
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return count;
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}
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static const struct file_operations zero_fops = {
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.read = hwsampler_zero_read,
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.write = hwsampler_zero_write,
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};
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/* /dev/oprofile/0/kernel file ops. */
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static ssize_t hwsampler_kernel_read(struct file *file, char __user *buf,
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size_t count, loff_t *offset)
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{
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return oprofilefs_ulong_to_user(counter_config.kernel,
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buf, count, offset);
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}
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static ssize_t hwsampler_kernel_write(struct file *file, char const __user *buf,
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size_t count, loff_t *offset)
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{
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unsigned long val;
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int retval;
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if (*offset)
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return -EINVAL;
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retval = oprofilefs_ulong_from_user(&val, buf, count);
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if (retval)
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return retval;
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if (val != 0 && val != 1)
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return -EINVAL;
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counter_config.kernel = val;
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return count;
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}
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static const struct file_operations kernel_fops = {
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.read = hwsampler_kernel_read,
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.write = hwsampler_kernel_write,
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};
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/* /dev/oprofile/0/user file ops. */
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static ssize_t hwsampler_user_read(struct file *file, char __user *buf,
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size_t count, loff_t *offset)
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{
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return oprofilefs_ulong_to_user(counter_config.user,
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buf, count, offset);
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}
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static ssize_t hwsampler_user_write(struct file *file, char const __user *buf,
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size_t count, loff_t *offset)
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{
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unsigned long val;
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int retval;
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if (*offset)
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return -EINVAL;
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retval = oprofilefs_ulong_from_user(&val, buf, count);
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if (retval)
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return retval;
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if (val != 0 && val != 1)
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return -EINVAL;
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||||
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counter_config.user = val;
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return count;
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}
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static const struct file_operations user_fops = {
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.read = hwsampler_user_read,
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.write = hwsampler_user_write,
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};
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|
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/*
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* File ops used for: /dev/oprofile/timer/enabled
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* The value always has to be the inverted value of hwsampler_enabled. So
|
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* no separate variable is created. That way we do not need locking.
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*/
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static ssize_t timer_enabled_read(struct file *file, char __user *buf,
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size_t count, loff_t *offset)
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||||
{
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||||
return oprofilefs_ulong_to_user(!hwsampler_enabled, buf, count, offset);
|
||||
}
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||||
|
||||
static ssize_t timer_enabled_write(struct file *file, char const __user *buf,
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||||
size_t count, loff_t *offset)
|
||||
{
|
||||
unsigned long val;
|
||||
int retval;
|
||||
|
||||
if (*offset)
|
||||
return -EINVAL;
|
||||
|
||||
retval = oprofilefs_ulong_from_user(&val, buf, count);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
if (val != 0 && val != 1)
|
||||
return -EINVAL;
|
||||
|
||||
/* Timer cannot be disabled without having hardware sampling. */
|
||||
if (val == 0 && !hwsampler_available)
|
||||
return -EINVAL;
|
||||
|
||||
if (oprofile_started)
|
||||
/*
|
||||
* save to do without locking as we set
|
||||
* hwsampler_running in start() when start_mutex is
|
||||
* held
|
||||
*/
|
||||
return -EBUSY;
|
||||
|
||||
hwsampler_enabled = !val;
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static const struct file_operations timer_enabled_fops = {
|
||||
.read = timer_enabled_read,
|
||||
.write = timer_enabled_write,
|
||||
};
|
||||
|
||||
|
||||
static int oprofile_create_hwsampling_files(struct super_block *sb,
|
||||
struct dentry *root)
|
||||
{
|
||||
struct dentry *dir;
|
||||
|
||||
dir = oprofilefs_mkdir(sb, root, "timer");
|
||||
if (!dir)
|
||||
return -EINVAL;
|
||||
|
||||
oprofilefs_create_file(sb, dir, "enabled", &timer_enabled_fops);
|
||||
|
||||
if (!hwsampler_available)
|
||||
return 0;
|
||||
|
||||
/* reinitialize default values */
|
||||
hwsampler_enabled = 1;
|
||||
counter_config.kernel = 1;
|
||||
counter_config.user = 1;
|
||||
|
||||
if (!force_cpu_type) {
|
||||
/*
|
||||
* Create the counter file system. A single virtual
|
||||
* counter is created which can be used to
|
||||
* enable/disable hardware sampling dynamically from
|
||||
* user space. The user space will configure a single
|
||||
* counter with a single event. The value of 'event'
|
||||
* and 'unit_mask' are not evaluated by the kernel code
|
||||
* and can only be set to 0.
|
||||
*/
|
||||
|
||||
dir = oprofilefs_mkdir(sb, root, "0");
|
||||
if (!dir)
|
||||
return -EINVAL;
|
||||
|
||||
oprofilefs_create_file(sb, dir, "enabled", &hwsampler_fops);
|
||||
oprofilefs_create_file(sb, dir, "event", &zero_fops);
|
||||
oprofilefs_create_file(sb, dir, "count", &hw_interval_fops);
|
||||
oprofilefs_create_file(sb, dir, "unit_mask", &zero_fops);
|
||||
oprofilefs_create_file(sb, dir, "kernel", &kernel_fops);
|
||||
oprofilefs_create_file(sb, dir, "user", &user_fops);
|
||||
oprofilefs_create_ulong(sb, dir, "hw_sdbt_blocks",
|
||||
&oprofile_sdbt_blocks);
|
||||
|
||||
} else {
|
||||
/*
|
||||
* Hardware sampling can be used but the cpu_type is
|
||||
* forced to timer in order to deal with legacy user
|
||||
* space tools. The /dev/oprofile/hwsampling fs is
|
||||
* provided in that case.
|
||||
*/
|
||||
dir = oprofilefs_mkdir(sb, root, "hwsampling");
|
||||
if (!dir)
|
||||
return -EINVAL;
|
||||
|
||||
oprofilefs_create_file(sb, dir, "hwsampler",
|
||||
&hwsampler_fops);
|
||||
oprofilefs_create_file(sb, dir, "hw_interval",
|
||||
&hw_interval_fops);
|
||||
oprofilefs_create_ro_ulong(sb, dir, "hw_min_interval",
|
||||
&oprofile_min_interval);
|
||||
oprofilefs_create_ro_ulong(sb, dir, "hw_max_interval",
|
||||
&oprofile_max_interval);
|
||||
oprofilefs_create_ulong(sb, dir, "hw_sdbt_blocks",
|
||||
&oprofile_sdbt_blocks);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int oprofile_hwsampler_init(struct oprofile_operations *ops)
|
||||
{
|
||||
/*
|
||||
* Initialize the timer mode infrastructure as well in order
|
||||
* to be able to switch back dynamically. oprofile_timer_init
|
||||
* is not supposed to fail.
|
||||
*/
|
||||
if (oprofile_timer_init(ops))
|
||||
BUG();
|
||||
|
||||
memcpy(&timer_ops, ops, sizeof(timer_ops));
|
||||
ops->create_files = oprofile_create_hwsampling_files;
|
||||
|
||||
/*
|
||||
* If the user space tools do not support newer cpu types,
|
||||
* the force_cpu_type module parameter
|
||||
* can be used to always return \"timer\" as cpu type.
|
||||
*/
|
||||
if (force_cpu_type != timer) {
|
||||
struct cpuid id;
|
||||
|
||||
get_cpu_id (&id);
|
||||
|
||||
switch (id.machine) {
|
||||
case 0x2097: case 0x2098: ops->cpu_type = "s390/z10"; break;
|
||||
case 0x2817: case 0x2818: ops->cpu_type = "s390/z196"; break;
|
||||
default: return -ENODEV;
|
||||
}
|
||||
}
|
||||
|
||||
if (hwsampler_setup())
|
||||
return -ENODEV;
|
||||
|
||||
/*
|
||||
* create hwsampler files only if hwsampler_setup() succeeds.
|
||||
* Query the range for the sampling interval from the
|
||||
* hardware.
|
||||
*/
|
||||
oprofile_min_interval = hwsampler_query_min_interval();
|
||||
if (oprofile_min_interval == 0)
|
||||
@ -155,23 +466,17 @@ static int oprofile_hwsampler_init(struct oprofile_operations *ops)
|
||||
if (oprofile_hw_interval > oprofile_max_interval)
|
||||
oprofile_hw_interval = oprofile_max_interval;
|
||||
|
||||
if (oprofile_timer_init(ops))
|
||||
return -ENODEV;
|
||||
|
||||
printk(KERN_INFO "oprofile: using hardware sampling\n");
|
||||
|
||||
memcpy(&timer_ops, ops, sizeof(timer_ops));
|
||||
printk(KERN_INFO "oprofile: System z hardware sampling "
|
||||
"facility found.\n");
|
||||
|
||||
ops->start = oprofile_hwsampler_start;
|
||||
ops->stop = oprofile_hwsampler_stop;
|
||||
ops->create_files = oprofile_create_hwsampling_files;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void oprofile_hwsampler_exit(void)
|
||||
{
|
||||
oprofile_timer_exit();
|
||||
hwsampler_shutdown();
|
||||
}
|
||||
|
||||
@ -182,7 +487,15 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
|
||||
ops->backtrace = s390_backtrace;
|
||||
|
||||
#ifdef CONFIG_64BIT
|
||||
return oprofile_hwsampler_init(ops);
|
||||
|
||||
/*
|
||||
* -ENODEV is not reported to the caller. The module itself
|
||||
* will use the timer mode sampling as fallback and this is
|
||||
* always available.
|
||||
*/
|
||||
hwsampler_available = oprofile_hwsampler_init(ops) == 0;
|
||||
|
||||
return 0;
|
||||
#else
|
||||
return -ENODEV;
|
||||
#endif
|
||||
|
||||
23
arch/s390/oprofile/op_counter.h
Normal file
23
arch/s390/oprofile/op_counter.h
Normal file
@ -0,0 +1,23 @@
|
||||
/**
|
||||
* arch/s390/oprofile/op_counter.h
|
||||
*
|
||||
* Copyright (C) 2011 IBM Deutschland Entwicklung GmbH, IBM Corporation
|
||||
* Author(s): Andreas Krebbel (krebbel@linux.vnet.ibm.com)
|
||||
*
|
||||
* @remark Copyright 2011 OProfile authors
|
||||
*/
|
||||
|
||||
#ifndef OP_COUNTER_H
|
||||
#define OP_COUNTER_H
|
||||
|
||||
struct op_counter_config {
|
||||
/* `enabled' maps to the hwsampler_file variable. */
|
||||
/* `count' maps to the oprofile_hw_interval variable. */
|
||||
/* `event' and `unit_mask' are unused. */
|
||||
unsigned long kernel;
|
||||
unsigned long user;
|
||||
};
|
||||
|
||||
extern struct op_counter_config counter_config;
|
||||
|
||||
#endif /* OP_COUNTER_H */
|
||||
@ -35,7 +35,6 @@ struct dentry;
|
||||
|
||||
void oprofile_create_files(struct super_block *sb, struct dentry *root);
|
||||
int oprofile_timer_init(struct oprofile_operations *ops);
|
||||
void oprofile_timer_exit(void);
|
||||
#ifdef CONFIG_OPROFILE_NMI_TIMER
|
||||
int op_nmi_timer_init(struct oprofile_operations *ops);
|
||||
#else
|
||||
|
||||
Loading…
Reference in New Issue
Block a user