diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/ia64/oprofile | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/ia64/oprofile')
-rw-r--r-- | kernel/arch/ia64/oprofile/Makefile | 10 | ||||
-rw-r--r-- | kernel/arch/ia64/oprofile/backtrace.c | 131 | ||||
-rw-r--r-- | kernel/arch/ia64/oprofile/init.c | 38 | ||||
-rw-r--r-- | kernel/arch/ia64/oprofile/perfmon.c | 99 |
4 files changed, 278 insertions, 0 deletions
diff --git a/kernel/arch/ia64/oprofile/Makefile b/kernel/arch/ia64/oprofile/Makefile new file mode 100644 index 000000000..aad27a718 --- /dev/null +++ b/kernel/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/kernel/arch/ia64/oprofile/backtrace.c b/kernel/arch/ia64/oprofile/backtrace.c new file mode 100644 index 000000000..6a219a946 --- /dev/null +++ b/kernel/arch/ia64/oprofile/backtrace.c @@ -0,0 +1,131 @@ +/** + * @file backtrace.c + * + * @remark Copyright 2004 Silicon Graphics Inc. All Rights Reserved. + * @remark Read the file COPYING + * + * @author Greg Banks <gnb@melbourne.sgi.com> + * @author Keith Owens <kaos@melbourne.sgi.com> + * 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 <linux/oprofile.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <asm/ptrace.h> + +/* + * 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; + unsigned long *prev_pfs_loc; /* state for WAR for old spinlock ool code */ +} ia64_backtrace_t; + +/* 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 = 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/kernel/arch/ia64/oprofile/init.c b/kernel/arch/ia64/oprofile/init.c new file mode 100644 index 000000000..31b545c35 --- /dev/null +++ b/kernel/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 <levon@movementarian.org> + */ + +#include <linux/kernel.h> +#include <linux/oprofile.h> +#include <linux/init.h> +#include <linux/errno.h> + +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/kernel/arch/ia64/oprofile/perfmon.c b/kernel/arch/ia64/oprofile/perfmon.c new file mode 100644 index 000000000..192d3e8e1 --- /dev/null +++ b/kernel/arch/ia64/oprofile/perfmon.c @@ -0,0 +1,99 @@ +/** + * @file perfmon.c + * + * @remark Copyright 2003 OProfile authors + * @remark Read the file COPYING + * + * @author John Levon <levon@movementarian.org> + */ + +#include <linux/kernel.h> +#include <linux/oprofile.h> +#include <linux/sched.h> +#include <asm/perfmon.h> +#include <asm/ptrace.h> +#include <asm/errno.h> + +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); +} |