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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ia64/oprofile
downloadconfigs-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'arch/ia64/oprofile')
-rw-r--r--arch/ia64/oprofile/Kconfig26
-rw-r--r--arch/ia64/oprofile/Makefile10
-rw-r--r--arch/ia64/oprofile/backtrace.c150
-rw-r--r--arch/ia64/oprofile/init.c38
-rw-r--r--arch/ia64/oprofile/perfmon.c100
5 files changed, 324 insertions, 0 deletions
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 <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>
+#include <asm/system.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;
+ 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 <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/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 <levon@movementarian.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/config.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);
+}