From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/ia64/oprofile/Kconfig | 26 +++++++ arch/ia64/oprofile/Makefile | 10 +++ arch/ia64/oprofile/backtrace.c | 150 +++++++++++++++++++++++++++++++++++++++++ arch/ia64/oprofile/init.c | 38 +++++++++++ arch/ia64/oprofile/perfmon.c | 100 +++++++++++++++++++++++++++ 5 files changed, 324 insertions(+) create mode 100644 arch/ia64/oprofile/Kconfig create mode 100644 arch/ia64/oprofile/Makefile create mode 100644 arch/ia64/oprofile/backtrace.c create mode 100644 arch/ia64/oprofile/init.c create mode 100644 arch/ia64/oprofile/perfmon.c (limited to 'arch/ia64/oprofile') diff --git a/arch/ia64/oprofile/Kconfig b/arch/ia64/oprofile/Kconfig new file mode 100644 index 00000000000..56e6f614b04 --- /dev/null +++ b/arch/ia64/oprofile/Kconfig @@ -0,0 +1,26 @@ + +menu "Profiling support" + depends on EXPERIMENTAL + +config PROFILING + bool "Profiling support (EXPERIMENTAL)" + help + Say Y here to enable the extended profiling support mechanisms used + by profilers such as OProfile. + +config OPROFILE + tristate "OProfile system profiling (EXPERIMENTAL)" + depends on PROFILING + help + OProfile is a profiling system capable of profiling the + whole system, include the kernel, kernel modules, libraries, + and applications. + + Due to firmware bugs, you may need to use the "nohalt" boot + option if you're using OProfile with the hardware performance + counters. + + If unsure, say N. + +endmenu + diff --git a/arch/ia64/oprofile/Makefile b/arch/ia64/oprofile/Makefile new file mode 100644 index 00000000000..aad27a718ee --- /dev/null +++ b/arch/ia64/oprofile/Makefile @@ -0,0 +1,10 @@ +obj-$(CONFIG_OPROFILE) += oprofile.o + +DRIVER_OBJS := $(addprefix ../../../drivers/oprofile/, \ + oprof.o cpu_buffer.o buffer_sync.o \ + event_buffer.o oprofile_files.o \ + oprofilefs.o oprofile_stats.o \ + timer_int.o ) + +oprofile-y := $(DRIVER_OBJS) init.o backtrace.o +oprofile-$(CONFIG_PERFMON) += perfmon.o diff --git a/arch/ia64/oprofile/backtrace.c b/arch/ia64/oprofile/backtrace.c new file mode 100644 index 00000000000..b7dabbfb0d6 --- /dev/null +++ b/arch/ia64/oprofile/backtrace.c @@ -0,0 +1,150 @@ +/** + * @file backtrace.c + * + * @remark Copyright 2004 Silicon Graphics Inc. All Rights Reserved. + * @remark Read the file COPYING + * + * @author Greg Banks + * @author Keith Owens + * Based on work done for the ia64 port of the SGI kernprof patch, which is + * Copyright (c) 2003-2004 Silicon Graphics Inc. All Rights Reserved. + */ + +#include +#include +#include +#include +#include + +/* + * For IA64 we need to perform a complex little dance to get both + * the struct pt_regs and a synthetic struct switch_stack in place + * to allow the unwind code to work. This dance requires our unwind + * using code to be called from a function called from unw_init_running(). + * There we only get a single void* data pointer, so use this struct + * to hold all the data we need during the unwind. + */ +typedef struct +{ + unsigned int depth; + struct pt_regs *regs; + struct unw_frame_info frame; + u64 *prev_pfs_loc; /* state for WAR for old spinlock ool code */ +} ia64_backtrace_t; + +#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3) +/* + * Returns non-zero if the PC is in the spinlock contention out-of-line code + * with non-standard calling sequence (on older compilers). + */ +static __inline__ int in_old_ool_spinlock_code(unsigned long pc) +{ + extern const char ia64_spinlock_contention_pre3_4[] __attribute__ ((weak)); + extern const char ia64_spinlock_contention_pre3_4_end[] __attribute__ ((weak)); + unsigned long sc_start = (unsigned long)ia64_spinlock_contention_pre3_4; + unsigned long sc_end = (unsigned long)ia64_spinlock_contention_pre3_4_end; + return (sc_start && sc_end && pc >= sc_start && pc < sc_end); +} +#else +/* Newer spinlock code does a proper br.call and works fine with the unwinder */ +#define in_old_ool_spinlock_code(pc) 0 +#endif + +/* Returns non-zero if the PC is in the Interrupt Vector Table */ +static __inline__ int in_ivt_code(unsigned long pc) +{ + extern char ia64_ivt[]; + return (pc >= (u_long)ia64_ivt && pc < (u_long)ia64_ivt+32768); +} + +/* + * Unwind to next stack frame. + */ +static __inline__ int next_frame(ia64_backtrace_t *bt) +{ + /* + * Avoid unsightly console message from unw_unwind() when attempting + * to unwind through the Interrupt Vector Table which has no unwind + * information. + */ + if (in_ivt_code(bt->frame.ip)) + return 0; + + /* + * WAR for spinlock contention from leaf functions. ia64_spinlock_contention_pre3_4 + * has ar.pfs == r0. Leaf functions do not modify ar.pfs so ar.pfs remains + * as 0, stopping the backtrace. Record the previous ar.pfs when the current + * IP is in ia64_spinlock_contention_pre3_4 then unwind, if pfs_loc has not changed + * after unwind then use pt_regs.ar_pfs which is where the real ar.pfs is for + * leaf functions. + */ + if (bt->prev_pfs_loc && bt->regs && bt->frame.pfs_loc == bt->prev_pfs_loc) + bt->frame.pfs_loc = &bt->regs->ar_pfs; + bt->prev_pfs_loc = (in_old_ool_spinlock_code(bt->frame.ip) ? bt->frame.pfs_loc : NULL); + + return unw_unwind(&bt->frame) == 0; +} + + +static void do_ia64_backtrace(struct unw_frame_info *info, void *vdata) +{ + ia64_backtrace_t *bt = vdata; + struct switch_stack *sw; + int count = 0; + u_long pc, sp; + + sw = (struct switch_stack *)(info+1); + /* padding from unw_init_running */ + sw = (struct switch_stack *)(((unsigned long)sw + 15) & ~15); + + unw_init_frame_info(&bt->frame, current, sw); + + /* skip over interrupt frame and oprofile calls */ + do { + unw_get_sp(&bt->frame, &sp); + if (sp >= (u_long)bt->regs) + break; + if (!next_frame(bt)) + return; + } while (count++ < 200); + + /* finally, grab the actual sample */ + while (bt->depth-- && next_frame(bt)) { + unw_get_ip(&bt->frame, &pc); + oprofile_add_trace(pc); + if (unw_is_intr_frame(&bt->frame)) { + /* + * Interrupt received on kernel stack; this can + * happen when timer interrupt fires while processing + * a softirq from the tail end of a hardware interrupt + * which interrupted a system call. Don't laugh, it + * happens! Splice the backtrace into two parts to + * avoid spurious cycles in the gprof output. + */ + /* TODO: split rather than drop the 2nd half */ + break; + } + } +} + +void +ia64_backtrace(struct pt_regs * const regs, unsigned int depth) +{ + ia64_backtrace_t bt; + unsigned long flags; + + /* + * On IA64 there is little hope of getting backtraces from + * user space programs -- the problems of getting the unwind + * information from arbitrary user programs are extreme. + */ + if (user_mode(regs)) + return; + + bt.depth = depth; + bt.regs = regs; + bt.prev_pfs_loc = NULL; + local_irq_save(flags); + unw_init_running(do_ia64_backtrace, &bt); + local_irq_restore(flags); +} diff --git a/arch/ia64/oprofile/init.c b/arch/ia64/oprofile/init.c new file mode 100644 index 00000000000..125a602a660 --- /dev/null +++ b/arch/ia64/oprofile/init.c @@ -0,0 +1,38 @@ +/** + * @file init.c + * + * @remark Copyright 2002 OProfile authors + * @remark Read the file COPYING + * + * @author John Levon + */ + +#include +#include +#include +#include + +extern int perfmon_init(struct oprofile_operations * ops); +extern void perfmon_exit(void); +extern void ia64_backtrace(struct pt_regs * const regs, unsigned int depth); + +int __init oprofile_arch_init(struct oprofile_operations * ops) +{ + int ret = -ENODEV; + +#ifdef CONFIG_PERFMON + /* perfmon_init() can fail, but we have no way to report it */ + ret = perfmon_init(ops); +#endif + ops->backtrace = ia64_backtrace; + + return ret; +} + + +void oprofile_arch_exit(void) +{ +#ifdef CONFIG_PERFMON + perfmon_exit(); +#endif +} diff --git a/arch/ia64/oprofile/perfmon.c b/arch/ia64/oprofile/perfmon.c new file mode 100644 index 00000000000..b7975a469fb --- /dev/null +++ b/arch/ia64/oprofile/perfmon.c @@ -0,0 +1,100 @@ +/** + * @file perfmon.c + * + * @remark Copyright 2003 OProfile authors + * @remark Read the file COPYING + * + * @author John Levon + */ + +#include +#include +#include +#include +#include +#include +#include + +static int allow_ints; + +static int +perfmon_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, + struct pt_regs *regs, unsigned long stamp) +{ + int event = arg->pmd_eventid; + + arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1; + + /* the owner of the oprofile event buffer may have exited + * without perfmon being shutdown (e.g. SIGSEGV) + */ + if (allow_ints) + oprofile_add_sample(regs, event); + return 0; +} + + +static int perfmon_start(void) +{ + allow_ints = 1; + return 0; +} + + +static void perfmon_stop(void) +{ + allow_ints = 0; +} + + +#define OPROFILE_FMT_UUID { \ + 0x77, 0x7a, 0x6e, 0x61, 0x20, 0x65, 0x73, 0x69, 0x74, 0x6e, 0x72, 0x20, 0x61, 0x65, 0x0a, 0x6c } + +static pfm_buffer_fmt_t oprofile_fmt = { + .fmt_name = "oprofile_format", + .fmt_uuid = OPROFILE_FMT_UUID, + .fmt_handler = perfmon_handler, +}; + + +static char * get_cpu_type(void) +{ + __u8 family = local_cpu_data->family; + + switch (family) { + case 0x07: + return "ia64/itanium"; + case 0x1f: + return "ia64/itanium2"; + default: + return "ia64/ia64"; + } +} + + +/* all the ops are handled via userspace for IA64 perfmon */ + +static int using_perfmon; + +int perfmon_init(struct oprofile_operations * ops) +{ + int ret = pfm_register_buffer_fmt(&oprofile_fmt); + if (ret) + return -ENODEV; + + ops->cpu_type = get_cpu_type(); + ops->start = perfmon_start; + ops->stop = perfmon_stop; + using_perfmon = 1; + printk(KERN_INFO "oprofile: using perfmon.\n"); + return 0; +} + + +void perfmon_exit(void) +{ + if (!using_perfmon) + return; + + pfm_unregister_buffer_fmt(oprofile_fmt.fmt_uuid); +} -- cgit v1.2.3