mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 00:06:51 +07:00
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/**
|
|
* @file common.c
|
|
*
|
|
* @remark Copyright 2004 Oprofile Authors
|
|
* @remark Copyright 2010 ARM Ltd.
|
|
* @remark Read the file COPYING
|
|
*
|
|
* @author Zwane Mwaikambo
|
|
* @author Will Deacon [move to perf]
|
|
*/
|
|
|
|
#include <linux/cpumask.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/oprofile.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/stacktrace.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/perf_event.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
#ifdef CONFIG_HW_PERF_EVENTS
|
|
|
|
/*
|
|
* OProfile has a curious naming scheme for the ARM PMUs, but they are
|
|
* part of the user ABI so we need to map from the perf PMU name for
|
|
* supported PMUs.
|
|
*/
|
|
static struct op_perf_name {
|
|
char *perf_name;
|
|
char *op_name;
|
|
} op_perf_name_map[] = {
|
|
{ "armv5_xscale1", "arm/xscale1" },
|
|
{ "armv5_xscale2", "arm/xscale2" },
|
|
{ "armv6_1136", "arm/armv6" },
|
|
{ "armv6_1156", "arm/armv6" },
|
|
{ "armv6_1176", "arm/armv6" },
|
|
{ "armv6_11mpcore", "arm/mpcore" },
|
|
{ "armv7_cortex_a8", "arm/armv7" },
|
|
{ "armv7_cortex_a9", "arm/armv7-ca9" },
|
|
};
|
|
|
|
char *op_name_from_perf_id(void)
|
|
{
|
|
int i;
|
|
struct op_perf_name names;
|
|
const char *perf_name = perf_pmu_name();
|
|
|
|
for (i = 0; i < ARRAY_SIZE(op_perf_name_map); ++i) {
|
|
names = op_perf_name_map[i];
|
|
if (!strcmp(names.perf_name, perf_name))
|
|
return names.op_name;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static int report_trace(struct stackframe *frame, void *d)
|
|
{
|
|
unsigned int *depth = d;
|
|
|
|
if (*depth) {
|
|
oprofile_add_trace(frame->pc);
|
|
(*depth)--;
|
|
}
|
|
|
|
return *depth == 0;
|
|
}
|
|
|
|
/*
|
|
* The registers we're interested in are at the end of the variable
|
|
* length saved register structure. The fp points at the end of this
|
|
* structure so the address of this struct is:
|
|
* (struct frame_tail *)(xxx->fp)-1
|
|
*/
|
|
struct frame_tail {
|
|
struct frame_tail *fp;
|
|
unsigned long sp;
|
|
unsigned long lr;
|
|
} __attribute__((packed));
|
|
|
|
static struct frame_tail* user_backtrace(struct frame_tail *tail)
|
|
{
|
|
struct frame_tail buftail[2];
|
|
|
|
/* Also check accessibility of one struct frame_tail beyond */
|
|
if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
|
|
return NULL;
|
|
if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail)))
|
|
return NULL;
|
|
|
|
oprofile_add_trace(buftail[0].lr);
|
|
|
|
/* frame pointers should strictly progress back up the stack
|
|
* (towards higher addresses) */
|
|
if (tail + 1 >= buftail[0].fp)
|
|
return NULL;
|
|
|
|
return buftail[0].fp-1;
|
|
}
|
|
|
|
static void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
|
|
{
|
|
struct frame_tail *tail = ((struct frame_tail *) regs->ARM_fp) - 1;
|
|
|
|
if (!user_mode(regs)) {
|
|
struct stackframe frame;
|
|
arm_get_current_stackframe(regs, &frame);
|
|
walk_stackframe(&frame, report_trace, &depth);
|
|
return;
|
|
}
|
|
|
|
while (depth-- && tail && !((unsigned long) tail & 3))
|
|
tail = user_backtrace(tail);
|
|
}
|
|
|
|
int __init oprofile_arch_init(struct oprofile_operations *ops)
|
|
{
|
|
/* provide backtrace support also in timer mode: */
|
|
ops->backtrace = arm_backtrace;
|
|
|
|
return oprofile_perf_init(ops);
|
|
}
|
|
|
|
void oprofile_arch_exit(void)
|
|
{
|
|
oprofile_perf_exit();
|
|
}
|