[Xen-changelog] [xen-unstable] [IA64] import linux/arch/ia64/oprofile/perfmon.c

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User awilliam@xxxxxxxxxxx
# Node ID dc614bb5b0e886136340898d34bab1c2566e168d
# Parent  da51aee40456f617666586154b46874480cea768
[IA64] import linux/arch/ia64/oprofile/perfmon.c

To xen/arch/ia64/xen/oprofile/perfmon.c

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 xen/arch/ia64/xen/oprofile/perfmon.c |  100 +++++++++++++++++++++++++++++++++++
 1 files changed, 100 insertions(+)

diff -r da51aee40456 -r dc614bb5b0e8 xen/arch/ia64/xen/oprofile/perfmon.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/arch/ia64/xen/oprofile/perfmon.c      Tue Nov 28 11:26:14 2006 -0700
@@ -0,0 +1,100 @@
+/**
+ * @file perfmon.c
+ *
+ * @remark Copyright 2003 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author John Levon <levon@xxxxxxxxxxxxxxxxx>
+ */
+
+#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);
+}

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