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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/perfmon.c
downloadlinux-stericsson-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/perfmon.c')
-rw-r--r--arch/ia64/oprofile/perfmon.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/ia64/oprofile/perfmon.c b/arch/ia64/oprofile/perfmon.c
new file mode 100644
index 000000000000..b7975a469fb8
--- /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);
+}