3d1ff755e3
The perf userspace tools can't handle dashes or spaces in PMU names, which conflicts with the current naming scheme in the arm perf backend. This prevents these PMUs from being accessed by name from the perf tools. Additionally the ARMv6 pmus are named "v6", which does not fully distinguish them in the sys/bus/event_source namespace. This patch renames the PMUs consistently to a lower case form with underscores, e.g. "armv6_1176", "armv7_cortex_a9". This is both readily accepted by today's perf tool, and far easier to type than the (apparently unused) convention in use previously. The OProfile name conversion code is updated to handle this. Due to a copy-paste error involving two "xscale1" entries, "xscale2" has never been matched by the name OProfile name mapping. While we're updating names, this is corrected. Acked-by: Will Deacon <will.deacon@arm.com> Tested-by: Christopher Covington <cov@codeaurora.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> [sachin: fixed missing semicolons in armv6 backend] Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/**
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* @file common.c
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*
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* @remark Copyright 2004 Oprofile Authors
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* @remark Copyright 2010 ARM Ltd.
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* @remark Read the file COPYING
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*
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* @author Zwane Mwaikambo
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* @author Will Deacon [move to perf]
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*/
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#include <linux/cpumask.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/oprofile.h>
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#include <linux/perf_event.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <asm/stacktrace.h>
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#include <linux/uaccess.h>
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#include <asm/perf_event.h>
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#include <asm/ptrace.h>
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#ifdef CONFIG_HW_PERF_EVENTS
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/*
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* OProfile has a curious naming scheme for the ARM PMUs, but they are
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* part of the user ABI so we need to map from the perf PMU name for
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* supported PMUs.
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*/
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static struct op_perf_name {
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char *perf_name;
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char *op_name;
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} op_perf_name_map[] = {
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{ "armv5_xscale1", "arm/xscale1" },
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{ "armv5_xscale2", "arm/xscale2" },
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{ "armv6_1136", "arm/armv6" },
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{ "armv6_1156", "arm/armv6" },
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{ "armv6_1176", "arm/armv6" },
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{ "armv6_11mpcore", "arm/mpcore" },
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{ "armv7_cortex_a8", "arm/armv7" },
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{ "armv7_cortex_a9", "arm/armv7-ca9" },
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};
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char *op_name_from_perf_id(void)
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{
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int i;
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struct op_perf_name names;
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const char *perf_name = perf_pmu_name();
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for (i = 0; i < ARRAY_SIZE(op_perf_name_map); ++i) {
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names = op_perf_name_map[i];
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if (!strcmp(names.perf_name, perf_name))
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return names.op_name;
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}
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return NULL;
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}
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#endif
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static int report_trace(struct stackframe *frame, void *d)
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{
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unsigned int *depth = d;
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if (*depth) {
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oprofile_add_trace(frame->pc);
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(*depth)--;
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}
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return *depth == 0;
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}
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/*
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* The registers we're interested in are at the end of the variable
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* length saved register structure. The fp points at the end of this
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* structure so the address of this struct is:
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* (struct frame_tail *)(xxx->fp)-1
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*/
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struct frame_tail {
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struct frame_tail *fp;
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unsigned long sp;
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unsigned long lr;
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} __attribute__((packed));
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static struct frame_tail* user_backtrace(struct frame_tail *tail)
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{
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struct frame_tail buftail[2];
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/* Also check accessibility of one struct frame_tail beyond */
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if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
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return NULL;
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if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail)))
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return NULL;
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oprofile_add_trace(buftail[0].lr);
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/* frame pointers should strictly progress back up the stack
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* (towards higher addresses) */
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if (tail + 1 >= buftail[0].fp)
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return NULL;
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return buftail[0].fp-1;
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}
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static void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
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{
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struct frame_tail *tail = ((struct frame_tail *) regs->ARM_fp) - 1;
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if (!user_mode(regs)) {
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struct stackframe frame;
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frame.fp = regs->ARM_fp;
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frame.sp = regs->ARM_sp;
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frame.lr = regs->ARM_lr;
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frame.pc = regs->ARM_pc;
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walk_stackframe(&frame, report_trace, &depth);
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return;
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}
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while (depth-- && tail && !((unsigned long) tail & 3))
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tail = user_backtrace(tail);
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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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/* provide backtrace support also in timer mode: */
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ops->backtrace = arm_backtrace;
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return oprofile_perf_init(ops);
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}
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void oprofile_arch_exit(void)
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{
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oprofile_perf_exit();
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}
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