282 lines
7.1 KiB
C
282 lines
7.1 KiB
C
/*
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* arch/sh/oprofile/op_model_sh7750.c
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*
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* OProfile support for SH7750/SH7750S Performance Counters
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*
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* Copyright (C) 2003, 2004 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/oprofile.h>
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#include <linux/profile.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/notifier.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#define PM_CR_BASE 0xff000084 /* 16-bit */
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#define PM_CTR_BASE 0xff100004 /* 32-bit */
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#define PMCR1 (PM_CR_BASE + 0x00)
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#define PMCR2 (PM_CR_BASE + 0x04)
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#define PMCTR1H (PM_CTR_BASE + 0x00)
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#define PMCTR1L (PM_CTR_BASE + 0x04)
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#define PMCTR2H (PM_CTR_BASE + 0x08)
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#define PMCTR2L (PM_CTR_BASE + 0x0c)
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#define PMCR_PMM_MASK 0x0000003f
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#define PMCR_CLKF 0x00000100
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#define PMCR_PMCLR 0x00002000
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#define PMCR_PMST 0x00004000
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#define PMCR_PMEN 0x00008000
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#define PMCR_ENABLE (PMCR_PMST | PMCR_PMEN)
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/*
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* SH7750/SH7750S have 2 perf counters
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*/
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#define NR_CNTRS 2
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extern const char *get_cpu_subtype(void);
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struct op_counter_config {
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unsigned long enabled;
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unsigned long event;
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unsigned long count;
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/* Dummy values for userspace tool compliance */
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unsigned long kernel;
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unsigned long user;
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unsigned long unit_mask;
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};
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static struct op_counter_config ctr[NR_CNTRS];
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/*
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* There are a number of events supported by each counter (33 in total).
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* Since we have 2 counters, each counter will take the event code as it
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* corresponds to the PMCR PMM setting. Each counter can be configured
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* independently.
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*
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* Event Code Description
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* ---------- -----------
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*
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* 0x01 Operand read access
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* 0x02 Operand write access
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* 0x03 UTLB miss
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* 0x04 Operand cache read miss
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* 0x05 Operand cache write miss
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* 0x06 Instruction fetch (w/ cache)
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* 0x07 Instruction TLB miss
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* 0x08 Instruction cache miss
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* 0x09 All operand accesses
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* 0x0a All instruction accesses
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* 0x0b OC RAM operand access
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* 0x0d On-chip I/O space access
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* 0x0e Operand access (r/w)
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* 0x0f Operand cache miss (r/w)
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* 0x10 Branch instruction
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* 0x11 Branch taken
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* 0x12 BSR/BSRF/JSR
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* 0x13 Instruction execution
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* 0x14 Instruction execution in parallel
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* 0x15 FPU Instruction execution
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* 0x16 Interrupt
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* 0x17 NMI
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* 0x18 trapa instruction execution
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* 0x19 UBCA match
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* 0x1a UBCB match
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* 0x21 Instruction cache fill
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* 0x22 Operand cache fill
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* 0x23 Elapsed time
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* 0x24 Pipeline freeze by I-cache miss
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* 0x25 Pipeline freeze by D-cache miss
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* 0x27 Pipeline freeze by branch instruction
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* 0x28 Pipeline freeze by CPU register
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* 0x29 Pipeline freeze by FPU
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*
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* Unfortunately we don't have a native exception or interrupt for counter
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* overflow (although since these counters can run for 16.3 days without
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* overflowing, it's not really necessary).
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*
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* OProfile on the other hand likes to have samples taken periodically, so
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* for now we just piggyback the timer interrupt to get the expected
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* behavior.
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*/
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static int sh7750_timer_notify(struct notifier_block *self,
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unsigned long val, void *regs)
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{
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oprofile_add_sample((struct pt_regs *)regs, 0);
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return 0;
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}
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static struct notifier_block sh7750_timer_notifier = {
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.notifier_call = sh7750_timer_notify,
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};
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static u64 sh7750_read_counter(int counter)
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{
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u32 hi, lo;
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hi = (counter == 0) ? ctrl_inl(PMCTR1H) : ctrl_inl(PMCTR2H);
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lo = (counter == 0) ? ctrl_inl(PMCTR1L) : ctrl_inl(PMCTR2L);
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return (u64)((u64)(hi & 0xffff) << 32) | lo;
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}
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/*
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* Files will be in a path like:
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*
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* /<oprofilefs mount point>/<counter number>/<file>
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*
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* So when dealing with <file>, we look to the parent dentry for the counter
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* number.
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*/
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static inline int to_counter(struct file *file)
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{
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const unsigned char *name = file->f_dentry->d_parent->d_name.name;
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return (int)simple_strtol(name, NULL, 10);
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}
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/*
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* XXX: We have 48-bit counters, so we're probably going to want something
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* more along the lines of oprofilefs_ullong_to_user().. Truncating to
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* unsigned long works fine for now though, as long as we don't attempt to
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* profile for too horribly long.
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*/
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static ssize_t sh7750_read_count(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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int counter = to_counter(file);
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u64 val = sh7750_read_counter(counter);
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return oprofilefs_ulong_to_user((unsigned long)val, buf, count, ppos);
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}
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static ssize_t sh7750_write_count(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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int counter = to_counter(file);
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unsigned long val;
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if (oprofilefs_ulong_from_user(&val, buf, count))
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return -EFAULT;
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/*
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* Any write will clear the counter, although only 0 should be
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* written for this purpose, as we do not support setting the
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* counter to an arbitrary value.
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*/
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WARN_ON(val != 0);
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if (counter == 0) {
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ctrl_outw(ctrl_inw(PMCR1) | PMCR_PMCLR, PMCR1);
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} else {
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ctrl_outw(ctrl_inw(PMCR2) | PMCR_PMCLR, PMCR2);
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}
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return count;
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}
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static struct file_operations count_fops = {
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.read = sh7750_read_count,
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.write = sh7750_write_count,
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};
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static int sh7750_perf_counter_create_files(struct super_block *sb, struct dentry *root)
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{
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int i;
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for (i = 0; i < NR_CNTRS; i++) {
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struct dentry *dir;
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char buf[3];
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snprintf(buf, sizeof(buf), "%d", i);
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dir = oprofilefs_mkdir(sb, root, buf);
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oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
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oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
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oprofilefs_create_file(sb, dir, "count", &count_fops);
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/* Dummy entries */
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oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
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oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
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oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
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}
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return 0;
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}
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static int sh7750_perf_counter_start(void)
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{
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u16 pmcr;
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/* Enable counter 1 */
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if (ctr[0].enabled) {
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pmcr = ctrl_inw(PMCR1);
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WARN_ON(pmcr & PMCR_PMEN);
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pmcr &= ~PMCR_PMM_MASK;
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pmcr |= ctr[0].event;
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ctrl_outw(pmcr | PMCR_ENABLE, PMCR1);
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}
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/* Enable counter 2 */
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if (ctr[1].enabled) {
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pmcr = ctrl_inw(PMCR2);
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WARN_ON(pmcr & PMCR_PMEN);
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pmcr &= ~PMCR_PMM_MASK;
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pmcr |= ctr[1].event;
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ctrl_outw(pmcr | PMCR_ENABLE, PMCR2);
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}
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return register_profile_notifier(&sh7750_timer_notifier);
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}
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static void sh7750_perf_counter_stop(void)
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{
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ctrl_outw(ctrl_inw(PMCR1) & ~PMCR_PMEN, PMCR1);
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ctrl_outw(ctrl_inw(PMCR2) & ~PMCR_PMEN, PMCR2);
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unregister_profile_notifier(&sh7750_timer_notifier);
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}
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static struct oprofile_operations sh7750_perf_counter_ops = {
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.create_files = sh7750_perf_counter_create_files,
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.start = sh7750_perf_counter_start,
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.stop = sh7750_perf_counter_stop,
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};
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int __init oprofile_arch_init(struct oprofile_operations **ops)
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{
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if (!(cpu_data->flags & CPU_HAS_PERF_COUNTER))
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return -ENODEV;
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sh7750_perf_counter_ops.cpu_type = (char *)get_cpu_subtype();
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*ops = &sh7750_perf_counter_ops;
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printk(KERN_INFO "oprofile: using SH-4 (%s) performance monitoring.\n",
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sh7750_perf_counter_ops.cpu_type);
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/* Clear the counters */
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ctrl_outw(ctrl_inw(PMCR1) | PMCR_PMCLR, PMCR1);
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ctrl_outw(ctrl_inw(PMCR2) | PMCR_PMCLR, PMCR2);
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return 0;
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}
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void oprofile_arch_exit(void)
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{
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}
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