Add oprofile support for metag.
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Robert Richter <rric@xxxxxxxxxx>
Cc: oprofile-list@xxxxxxxxxxxx
---
arch/metag/Kconfig | 1 +
arch/metag/Makefile | 2 +
arch/metag/oprofile/Makefile | 16 ++
arch/metag/oprofile/backtrace.c | 134 ++++++++++++++++++
arch/metag/oprofile/backtrace.h | 6 +
arch/metag/oprofile/op_model_meta12.c | 242 +++++++++++++++++++++++++++++++++
6 files changed, 401 insertions(+), 0 deletions(-)
create mode 100644 arch/metag/oprofile/Makefile
create mode 100644 arch/metag/oprofile/backtrace.c
create mode 100644 arch/metag/oprofile/backtrace.h
create mode 100644 arch/metag/oprofile/op_model_meta12.c
diff --git a/arch/metag/Kconfig b/arch/metag/Kconfig
index e2235e3..98433e5 100644
--- a/arch/metag/Kconfig
+++ b/arch/metag/Kconfig
@@ -25,6 +25,7 @@ config METAG
select HAVE_MEMBLOCK
select HAVE_MEMBLOCK_NODE_MAP
select HAVE_MOD_ARCH_SPECIFIC
+ select HAVE_OPROFILE
select HAVE_PERF_EVENTS
select HAVE_SYSCALL_TRACEPOINTS
select IRQ_DOMAIN
diff --git a/arch/metag/Makefile b/arch/metag/Makefile
index d455140..53fc094 100644
--- a/arch/metag/Makefile
+++ b/arch/metag/Makefile
@@ -49,6 +49,8 @@ core-y += arch/metag/mm/
libs-y += arch/metag/lib/
libs-y += arch/metag/tbx/
+drivers-$(CONFIG_OPROFILE) += arch/metag/oprofile/
+
boot := arch/metag/boot
boot_targets += uImage
diff --git a/arch/metag/oprofile/Makefile b/arch/metag/oprofile/Makefile
new file mode 100644
index 0000000..4b4ceee
--- /dev/null
+++ b/arch/metag/oprofile/Makefile
@@ -0,0 +1,16 @@
+obj-y += oprofile.o
+
+oprofile-core-y += buffer_sync.o
+oprofile-core-y += cpu_buffer.o
+oprofile-core-y += event_buffer.o
+oprofile-core-y += oprof.o
+oprofile-core-y += oprofile_files.o
+oprofile-core-y += oprofile_stats.o
+oprofile-core-y += oprofilefs.o
+oprofile-core-y += timer_int.o
+
+oprofile-y += backtrace.o
+oprofile-y += op_model_meta12.o
+oprofile-y += $(addprefix ../../../drivers/oprofile/,$(oprofile-core-y))
+
+ccflags-y += -Werror
diff --git a/arch/metag/oprofile/backtrace.c b/arch/metag/oprofile/backtrace.c
new file mode 100644
index 0000000..0ae7489
--- /dev/null
+++ b/arch/metag/oprofile/backtrace.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2010 Imagination Technologies Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/oprofile.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include "backtrace.h"
+
+#ifdef CONFIG_FRAME_POINTER
+
+#ifdef CONFIG_KALLSYMS
+#include <linux/kallsyms.h>
+#include <linux/module.h>
+
+static unsigned long tbi_boing_addr;
+static unsigned long tbi_boing_size;
+#endif
+
+static void user_backtrace_fp(unsigned long __user *fp, unsigned int depth)
+{
+ while (depth-- && access_ok(VERIFY_READ, fp, 8)) {
+ unsigned long addr;
+ unsigned long __user *fpnew;
+ if (__copy_from_user_inatomic(&addr, fp + 1, sizeof(addr)))
+ break;
+ addr -= 4;
+
+ oprofile_add_trace(addr);
+
+ /* stack grows up, so frame pointers must decrease */
+ if (__copy_from_user_inatomic(&fpnew, fp + 0, sizeof(fpnew)))
+ break;
+ if (fpnew > fp)
+ break;
+ fp = fpnew;
+ }
+}
+
+static void kernel_backtrace_fp(unsigned long *fp, unsigned long *stack,
+ unsigned int depth)
+{
+#ifdef CONFIG_KALLSYMS
+ /* We need to know where TBIBoingVec is and it's size */
+ if (!tbi_boing_addr) {
+ unsigned long size;
+ unsigned long offset;
+ char modname[MODULE_NAME_LEN];
+ char name[KSYM_NAME_LEN];
+ tbi_boing_addr = kallsyms_lookup_name("___TBIBoingVec");
+ if (!tbi_boing_addr)
+ tbi_boing_addr = 1;
+ else if (!lookup_symbol_attrs(tbi_boing_addr, &size,
+ &offset, modname, name))
+ tbi_boing_size = size;
+ }
+#endif
+ /* detect when the frame pointer has been used for other purposes and
+ * doesn't point to the stack (it may point completely elsewhere which
+ * kstack_end may not detect).
+ */
+ while (depth-- && fp >= stack && fp + 8 <= stack + THREAD_SIZE) {
+ unsigned long addr;
+ unsigned long *fpnew;
+
+ addr = fp[1] - 4;
+ if (!__kernel_text_address(addr))
+ break;
+
+ oprofile_add_trace(addr);
+
+ /* stack grows up, so frame pointers must decrease */
+ fpnew = (unsigned long *)fp[0];
+ if (fpnew > fp)
+ break;
+ fp = fpnew;
+
+#ifdef CONFIG_KALLSYMS
+ /* If we've reached TBIBoingVec then we're at an interrupt
+ * entry point or a syscall entry point. The frame pointer
+ * points to a pt_regs which can be used to continue tracing on
+ * the other side of the boing.
+ */
+ if (tbi_boing_size && addr >= tbi_boing_addr &&
+ addr < tbi_boing_addr + tbi_boing_size) {
+ struct pt_regs *regs = (struct pt_regs *)fp;
+ /* OProfile doesn't understand backtracing into
+ * userland.
+ */
+ if (!user_mode(regs) && --depth) {
+ oprofile_add_trace(regs->ctx.CurrPC);
+ metag_backtrace(regs, depth);
+ }
+ break;
+ }
+#endif
+ }
+}
+#else
+static void kernel_backtrace_sp(unsigned long *sp, unsigned int depth)
+{
+ while (!kstack_end(sp)) {
+ unsigned long addr = *sp--;
+
+ if (!__kernel_text_address(addr - 4))
+ continue;
+ if (!depth--)
+ break;
+ oprofile_add_trace(addr);
+ }
+}
+#endif
+
+void metag_backtrace(struct pt_regs * const regs, unsigned int depth)
+{
+#ifdef CONFIG_FRAME_POINTER
+ unsigned long *fp = (unsigned long *)regs->ctx.AX[1].U0;
+ if (user_mode(regs))
+ user_backtrace_fp((unsigned long __user __force *)fp, depth);
+ else
+ kernel_backtrace_fp(fp, task_stack_page(current), depth);
+#else
+ if (!user_mode(regs)) {
+ unsigned long *sp = (unsigned long *)regs->ctx.AX[0].U0;
+ kernel_backtrace_sp(sp, depth);
+ }
+#endif
+}
diff --git a/arch/metag/oprofile/backtrace.h b/arch/metag/oprofile/backtrace.h
new file mode 100644
index 0000000..c0fcc42
--- /dev/null
+++ b/arch/metag/oprofile/backtrace.h
@@ -0,0 +1,6 @@
+#ifndef _METAG_OPROFILE_BACKTRACE_H
+#define _METAG_OPROFILE_BACKTRACE_H
+
+void metag_backtrace(struct pt_regs * const regs, unsigned int depth);
+
+#endif
diff --git a/arch/metag/oprofile/op_model_meta12.c b/arch/metag/oprofile/op_model_meta12.c
new file mode 100644
index 0000000..0cb103c
--- /dev/null
+++ b/arch/metag/oprofile/op_model_meta12.c
@@ -0,0 +1,242 @@
+/*
+ * Meta version derived from arch/sh/oprofile/op_model_sh7750.c
+ * Copyright (C) 2008 Imagination Technologies Ltd.
+ *
+ * arch/sh/oprofile/op_model_sh7750.c
+ *
+ * OProfile support for SH7750/SH7750S Performance Counters
+ *
+ * Copyright (C) 2003, 2004 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/oprofile.h>
+#include <linux/profile.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/metag_mem.h>
+
+#include "backtrace.h"
+
+/*
+ * Meta has 2 perf counters
+ */
+#define NR_CNTRS 2
+
+struct op_counter_config {
+ unsigned long enabled;
+ unsigned long event;
+ unsigned long count;
+ unsigned long unit_mask;
+
+ /* Dummy values for userspace tool compliance */
+ unsigned long kernel;
+ unsigned long user;
+};
+
+static struct op_counter_config ctr[NR_CNTRS];
+
+static u32 meta_read_counter(int counter)
+{
+ u32 val = metag_in32(counter ? PERF_COUNT0 : PERF_COUNT1);
+ return val;
+}
+
+static void meta_write_counter(int counter, u32 val)
+{
+ metag_out32(val, counter ? PERF_COUNT0 : PERF_COUNT1);
+}
+
+/*
+ * Unfortunately we don't have a native exception or interrupt for counter
+ * overflow.
+ *
+ * OProfile on the other hand likes to have samples taken periodically, so
+ * for now we just piggyback the timer interrupt to get the expected
+ * behavior.
+ */
+
+static int meta_timer_notify(struct pt_regs *regs)
+{
+ int i;
+ u32 val, total_val, sub_val;
+ u32 enabled_threads;
+
+ for (i = 0; i < NR_CNTRS; i++) {
+ if (!ctr[i].enabled)
+ continue;
+
+ /* Disable performance monitoring. */
+ enabled_threads = meta_read_counter(i);
+ meta_write_counter(i, 0);
+
+ sub_val = total_val = val = enabled_threads & PERF_COUNT_BITS;
+
+ if (val >= ctr[i].count) {
+ while (val > ctr[i].count) {
+ oprofile_add_sample(regs, i);
+ val -= ctr[i].count;
+ }
+ /* val may be < ctr[i].count but > 0 */
+ sub_val -= val;
+ total_val -= sub_val;
+ }
+
+ /* Enable performance monitoring. */
+ enabled_threads &= (PERF_CTRL_BITS | PERF_THREAD_BITS);
+ enabled_threads = enabled_threads | total_val;
+ meta_write_counter(i, enabled_threads);
+ }
+
+ return 0;
+}
+
+/*
+ * Files will be in a path like:
+ *
+ * /<oprofilefs mount point>/<counter number>/<file>
+ *
+ * So when dealing with <file>, we look to the parent dentry for the counter
+ * number.
+ */
+static inline int to_counter(struct file *file)
+{
+ long val;
+ const unsigned char *name = file->f_path.dentry->d_parent->d_name.name;
+
+ if (kstrtol(name, 10, &val))
+ return 0;
+
+ return val;
+}
+
+static ssize_t meta_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos, int mask, int shift)
+{
+ int counter = to_counter(file);
+ unsigned long write_val;
+ u32 read_val;
+
+ if (oprofilefs_ulong_from_user(&write_val, buf, count))
+ return -EFAULT;
+
+ read_val = meta_read_counter(counter) & ~mask;
+ write_val <<= shift;
+
+ write_val = read_val | (write_val & mask);
+ meta_write_counter(counter, write_val);
+
+ return count;
+}
+
+/*
+ * These functions handle turning perfomance counters on for particular
+ * threads by writing to files.
+ */
+static ssize_t meta_read_thread(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int counter = to_counter(file);
+ u32 val = meta_read_counter(counter);
+
+ val &= PERF_THREAD_BITS;
+ val >>= PERF_THREAD_S;
+
+ return oprofilefs_ulong_to_user((unsigned long)val, buf, count, ppos);
+}
+
+static ssize_t meta_write_thread(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ meta_write(file, buf, count, ppos, PERF_THREAD_BITS, PERF_THREAD_S);
+ return count;
+}
+
+static const struct file_operations thread_fops = {
+ .read = meta_read_thread,
+ .write = meta_write_thread,
+};
+
+static int meta_perf_counter_create_files(struct super_block *sb,
+ struct dentry *root)
+{
+ int i;
+
+ for (i = 0; i < NR_CNTRS; i++) {
+ struct dentry *dir;
+ char buf[4];
+
+ snprintf(buf, sizeof(buf), "%d", i);
+ dir = oprofilefs_mkdir(sb, root, buf);
+
+ oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
+ oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
+ oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
+ oprofilefs_create_file(sb, dir, "unit_mask", &thread_fops);
+
+ /* Dummy entries */
+ oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
+ oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
+ }
+
+ return 0;
+}
+
+static int meta_perf_counter_start(void)
+{
+ int i;
+ u32 event, read_val;
+
+ for (i = 0; i < NR_CNTRS; i++) {
+ if (!ctr[i].enabled)
+ continue;
+
+ event = ctr[i].event << PERF_CTRL_S;
+ read_val = meta_read_counter(i) & ~PERF_CTRL_BITS;
+ meta_write_counter(i, read_val | event);
+ }
+
+ return register_timer_hook(meta_timer_notify);
+}
+
+static void meta_perf_counter_stop(void)
+{
+ u32 val;
+
+ val = meta_read_counter(0) & ~PERF_THREAD_BITS;
+ meta_write_counter(0, val);
+
+ val = meta_read_counter(1) & ~PERF_THREAD_BITS;
+ meta_write_counter(1, val);
+
+ unregister_timer_hook(meta_timer_notify);
+}
+
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+ ops->cpu_type = "metag";
+ ops->create_files = meta_perf_counter_create_files;
+ ops->start = meta_perf_counter_start;
+ ops->stop = meta_perf_counter_stop;
+ ops->backtrace = metag_backtrace;
+
+ pr_info("oprofile: using %s performance monitoring.\n", ops->cpu_type);
+
+ /* Clear the counters. */
+ meta_write_counter(0, 0);
+ meta_write_counter(1, 0);
+
+ return 0;
+}
+
+void oprofile_arch_exit(void)
+{
+}
+
--
1.7.7.6
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