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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/arm/oprofile
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.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/arm/oprofile')
-rw-r--r--arch/arm/oprofile/Kconfig23
-rw-r--r--arch/arm/oprofile/Makefile11
-rw-r--r--arch/arm/oprofile/common.c156
-rw-r--r--arch/arm/oprofile/init.c31
-rw-r--r--arch/arm/oprofile/op_arm_model.h29
-rw-r--r--arch/arm/oprofile/op_counter.h29
-rw-r--r--arch/arm/oprofile/op_model_xscale.c443
7 files changed, 722 insertions, 0 deletions
diff --git a/arch/arm/oprofile/Kconfig b/arch/arm/oprofile/Kconfig
new file mode 100644
index 0000000..19d3773
--- /dev/null
+++ b/arch/arm/oprofile/Kconfig
@@ -0,0 +1,23 @@
+
+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.
+
+ If unsure, say N.
+
+endmenu
+
diff --git a/arch/arm/oprofile/Makefile b/arch/arm/oprofile/Makefile
new file mode 100644
index 0000000..ba1a6e9
--- /dev/null
+++ b/arch/arm/oprofile/Makefile
@@ -0,0 +1,11 @@
+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 := $(DRIVER_OBJS) init.o
+oprofile-$(CONFIG_CPU_XSCALE) += common.o op_model_xscale.o
+
diff --git a/arch/arm/oprofile/common.c b/arch/arm/oprofile/common.c
new file mode 100644
index 0000000..e57dde8
--- /dev/null
+++ b/arch/arm/oprofile/common.c
@@ -0,0 +1,156 @@
+/**
+ * @file common.c
+ *
+ * @remark Copyright 2004 Oprofile Authors
+ * @remark Read the file COPYING
+ *
+ * @author Zwane Mwaikambo
+ */
+
+#include <linux/init.h>
+#include <linux/oprofile.h>
+#include <linux/errno.h>
+#include <asm/semaphore.h>
+#include <linux/sysdev.h>
+
+#include "op_counter.h"
+#include "op_arm_model.h"
+
+static struct op_arm_model_spec *pmu_model;
+static int pmu_enabled;
+static struct semaphore pmu_sem;
+
+static int pmu_start(void);
+static int pmu_setup(void);
+static void pmu_stop(void);
+static int pmu_create_files(struct super_block *, struct dentry *);
+
+#ifdef CONFIG_PM
+static int pmu_suspend(struct sys_device *dev, pm_message_t state)
+{
+ if (pmu_enabled)
+ pmu_stop();
+ return 0;
+}
+
+static int pmu_resume(struct sys_device *dev)
+{
+ if (pmu_enabled)
+ pmu_start();
+ return 0;
+}
+
+static struct sysdev_class oprofile_sysclass = {
+ set_kset_name("oprofile"),
+ .resume = pmu_resume,
+ .suspend = pmu_suspend,
+};
+
+static struct sys_device device_oprofile = {
+ .id = 0,
+ .cls = &oprofile_sysclass,
+};
+
+static int __init init_driverfs(void)
+{
+ int ret;
+
+ if (!(ret = sysdev_class_register(&oprofile_sysclass)))
+ ret = sysdev_register(&device_oprofile);
+
+ return ret;
+}
+
+static void exit_driverfs(void)
+{
+ sysdev_unregister(&device_oprofile);
+ sysdev_class_unregister(&oprofile_sysclass);
+}
+#else
+#define init_driverfs() do { } while (0)
+#define exit_driverfs() do { } while (0)
+#endif /* CONFIG_PM */
+
+struct op_counter_config counter_config[OP_MAX_COUNTER];
+
+static int pmu_create_files(struct super_block *sb, struct dentry *root)
+{
+ unsigned int i;
+
+ for (i = 0; i < pmu_model->num_counters; i++) {
+ struct dentry *dir;
+ char buf[2];
+
+ snprintf(buf, sizeof buf, "%d", i);
+ dir = oprofilefs_mkdir(sb, root, buf);
+ oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
+ oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
+ oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
+ oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
+ oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
+ oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
+ }
+
+ return 0;
+}
+
+static int pmu_setup(void)
+{
+ int ret;
+
+ spin_lock(&oprofilefs_lock);
+ ret = pmu_model->setup_ctrs();
+ spin_unlock(&oprofilefs_lock);
+ return ret;
+}
+
+static int pmu_start(void)
+{
+ int ret = -EBUSY;
+
+ down(&pmu_sem);
+ if (!pmu_enabled) {
+ ret = pmu_model->start();
+ pmu_enabled = !ret;
+ }
+ up(&pmu_sem);
+ return ret;
+}
+
+static void pmu_stop(void)
+{
+ down(&pmu_sem);
+ if (pmu_enabled)
+ pmu_model->stop();
+ pmu_enabled = 0;
+ up(&pmu_sem);
+}
+
+int __init pmu_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec)
+{
+ init_MUTEX(&pmu_sem);
+
+ if (spec->init() < 0)
+ return -ENODEV;
+
+ pmu_model = spec;
+ init_driverfs();
+ ops->create_files = pmu_create_files;
+ ops->setup = pmu_setup;
+ ops->shutdown = pmu_stop;
+ ops->start = pmu_start;
+ ops->stop = pmu_stop;
+ ops->cpu_type = pmu_model->name;
+ printk(KERN_INFO "oprofile: using %s PMU\n", spec->name);
+
+ return 0;
+}
+
+void pmu_exit(void)
+{
+ if (pmu_model) {
+ exit_driverfs();
+ pmu_model = NULL;
+ }
+}
+
diff --git a/arch/arm/oprofile/init.c b/arch/arm/oprofile/init.c
new file mode 100644
index 0000000..cce3d30
--- /dev/null
+++ b/arch/arm/oprofile/init.c
@@ -0,0 +1,31 @@
+/**
+ * @file init.c
+ *
+ * @remark Copyright 2004 Oprofile Authors
+ * @remark Read the file COPYING
+ *
+ * @author Zwane Mwaikambo
+ */
+
+#include <linux/oprofile.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include "op_arm_model.h"
+
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+ int ret = -ENODEV;
+
+#ifdef CONFIG_CPU_XSCALE
+ ret = pmu_init(ops, &op_xscale_spec);
+#endif
+
+ return ret;
+}
+
+void oprofile_arch_exit(void)
+{
+#ifdef CONFIG_CPU_XSCALE
+ pmu_exit();
+#endif
+}
diff --git a/arch/arm/oprofile/op_arm_model.h b/arch/arm/oprofile/op_arm_model.h
new file mode 100644
index 0000000..2d4caf4
--- /dev/null
+++ b/arch/arm/oprofile/op_arm_model.h
@@ -0,0 +1,29 @@
+/**
+ * @file op_arm_model.h
+ * interface to ARM machine specific operations
+ *
+ * @remark Copyright 2004 Oprofile Authors
+ * @remark Read the file COPYING
+ *
+ * @author Zwane Mwaikambo
+ */
+
+#ifndef OP_ARM_MODEL_H
+#define OP_ARM_MODEL_H
+
+struct op_arm_model_spec {
+ int (*init)(void);
+ unsigned int num_counters;
+ int (*setup_ctrs)(void);
+ int (*start)(void);
+ void (*stop)(void);
+ char *name;
+};
+
+#ifdef CONFIG_CPU_XSCALE
+extern struct op_arm_model_spec op_xscale_spec;
+#endif
+
+extern int __init pmu_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec);
+extern void pmu_exit(void);
+#endif /* OP_ARM_MODEL_H */
diff --git a/arch/arm/oprofile/op_counter.h b/arch/arm/oprofile/op_counter.h
new file mode 100644
index 0000000..153c1d4
--- /dev/null
+++ b/arch/arm/oprofile/op_counter.h
@@ -0,0 +1,29 @@
+/**
+ * @file op_counter.h
+ *
+ * @remark Copyright 2004 Oprofile Authors
+ * @remark Read the file COPYING
+ *
+ * @author Zwane Mwaikambo
+ */
+
+#ifndef OP_COUNTER_H
+#define OP_COUNTER_H
+
+#define OP_MAX_COUNTER 5
+
+/* Per performance monitor configuration as set via
+ * oprofilefs.
+ */
+struct op_counter_config {
+ unsigned long count;
+ unsigned long enabled;
+ unsigned long event;
+ unsigned long unit_mask;
+ unsigned long kernel;
+ unsigned long user;
+};
+
+extern struct op_counter_config counter_config[];
+
+#endif /* OP_COUNTER_H */
diff --git a/arch/arm/oprofile/op_model_xscale.c b/arch/arm/oprofile/op_model_xscale.c
new file mode 100644
index 0000000..e0f0b32
--- /dev/null
+++ b/arch/arm/oprofile/op_model_xscale.c
@@ -0,0 +1,443 @@
+/**
+ * @file op_model_xscale.c
+ * XScale Performance Monitor Driver
+ *
+ * @remark Copyright 2000-2004 Deepak Saxena <dsaxena@mvista.com>
+ * @remark Copyright 2000-2004 MontaVista Software Inc
+ * @remark Copyright 2004 Dave Jiang <dave.jiang@intel.com>
+ * @remark Copyright 2004 Intel Corporation
+ * @remark Copyright 2004 Zwane Mwaikambo <zwane@arm.linux.org.uk>
+ * @remark Copyright 2004 OProfile Authors
+ *
+ * @remark Read the file COPYING
+ *
+ * @author Zwane Mwaikambo
+ */
+
+/* #define DEBUG */
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/oprofile.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+
+#include "op_counter.h"
+#include "op_arm_model.h"
+
+#define PMU_ENABLE 0x001 /* Enable counters */
+#define PMN_RESET 0x002 /* Reset event counters */
+#define CCNT_RESET 0x004 /* Reset clock counter */
+#define PMU_RESET (CCNT_RESET | PMN_RESET)
+#define PMU_CNT64 0x008 /* Make CCNT count every 64th cycle */
+
+/* TODO do runtime detection */
+#ifdef CONFIG_ARCH_IOP310
+#define XSCALE_PMU_IRQ IRQ_XS80200_PMU
+#endif
+#ifdef CONFIG_ARCH_IOP321
+#define XSCALE_PMU_IRQ IRQ_IOP321_CORE_PMU
+#endif
+#ifdef CONFIG_ARCH_IOP331
+#define XSCALE_PMU_IRQ IRQ_IOP331_CORE_PMU
+#endif
+#ifdef CONFIG_ARCH_PXA
+#define XSCALE_PMU_IRQ IRQ_PMU
+#endif
+
+/*
+ * Different types of events that can be counted by the XScale PMU
+ * as used by Oprofile userspace. Here primarily for documentation
+ * purposes.
+ */
+
+#define EVT_ICACHE_MISS 0x00
+#define EVT_ICACHE_NO_DELIVER 0x01
+#define EVT_DATA_STALL 0x02
+#define EVT_ITLB_MISS 0x03
+#define EVT_DTLB_MISS 0x04
+#define EVT_BRANCH 0x05
+#define EVT_BRANCH_MISS 0x06
+#define EVT_INSTRUCTION 0x07
+#define EVT_DCACHE_FULL_STALL 0x08
+#define EVT_DCACHE_FULL_STALL_CONTIG 0x09
+#define EVT_DCACHE_ACCESS 0x0A
+#define EVT_DCACHE_MISS 0x0B
+#define EVT_DCACE_WRITE_BACK 0x0C
+#define EVT_PC_CHANGED 0x0D
+#define EVT_BCU_REQUEST 0x10
+#define EVT_BCU_FULL 0x11
+#define EVT_BCU_DRAIN 0x12
+#define EVT_BCU_ECC_NO_ELOG 0x14
+#define EVT_BCU_1_BIT_ERR 0x15
+#define EVT_RMW 0x16
+/* EVT_CCNT is not hardware defined */
+#define EVT_CCNT 0xFE
+#define EVT_UNUSED 0xFF
+
+struct pmu_counter {
+ volatile unsigned long ovf;
+ unsigned long reset_counter;
+};
+
+enum { CCNT, PMN0, PMN1, PMN2, PMN3, MAX_COUNTERS };
+
+static struct pmu_counter results[MAX_COUNTERS];
+
+/*
+ * There are two versions of the PMU in current XScale processors
+ * with differing register layouts and number of performance counters.
+ * e.g. IOP321 is xsc1 whilst IOP331 is xsc2.
+ * We detect which register layout to use in xscale_detect_pmu()
+ */
+enum { PMU_XSC1, PMU_XSC2 };
+
+struct pmu_type {
+ int id;
+ char *name;
+ int num_counters;
+ unsigned int int_enable;
+ unsigned int cnt_ovf[MAX_COUNTERS];
+ unsigned int int_mask[MAX_COUNTERS];
+};
+
+static struct pmu_type pmu_parms[] = {
+ {
+ .id = PMU_XSC1,
+ .name = "arm/xscale1",
+ .num_counters = 3,
+ .int_mask = { [PMN0] = 0x10, [PMN1] = 0x20,
+ [CCNT] = 0x40 },
+ .cnt_ovf = { [CCNT] = 0x400, [PMN0] = 0x100,
+ [PMN1] = 0x200},
+ },
+ {
+ .id = PMU_XSC2,
+ .name = "arm/xscale2",
+ .num_counters = 5,
+ .int_mask = { [CCNT] = 0x01, [PMN0] = 0x02,
+ [PMN1] = 0x04, [PMN2] = 0x08,
+ [PMN3] = 0x10 },
+ .cnt_ovf = { [CCNT] = 0x01, [PMN0] = 0x02,
+ [PMN1] = 0x04, [PMN2] = 0x08,
+ [PMN3] = 0x10 },
+ },
+};
+
+static struct pmu_type *pmu;
+
+static void write_pmnc(u32 val)
+{
+ if (pmu->id == PMU_XSC1) {
+ /* upper 4bits and 7, 11 are write-as-0 */
+ val &= 0xffff77f;
+ __asm__ __volatile__ ("mcr p14, 0, %0, c0, c0, 0" : : "r" (val));
+ } else {
+ /* bits 4-23 are write-as-0, 24-31 are write ignored */
+ val &= 0xf;
+ __asm__ __volatile__ ("mcr p14, 0, %0, c0, c1, 0" : : "r" (val));
+ }
+}
+
+static u32 read_pmnc(void)
+{
+ u32 val;
+
+ if (pmu->id == PMU_XSC1)
+ __asm__ __volatile__ ("mrc p14, 0, %0, c0, c0, 0" : "=r" (val));
+ else {
+ __asm__ __volatile__ ("mrc p14, 0, %0, c0, c1, 0" : "=r" (val));
+ /* bits 1-2 and 4-23 are read-unpredictable */
+ val &= 0xff000009;
+ }
+
+ return val;
+}
+
+static u32 __xsc1_read_counter(int counter)
+{
+ u32 val = 0;
+
+ switch (counter) {
+ case CCNT:
+ __asm__ __volatile__ ("mrc p14, 0, %0, c1, c0, 0" : "=r" (val));
+ break;
+ case PMN0:
+ __asm__ __volatile__ ("mrc p14, 0, %0, c2, c0, 0" : "=r" (val));
+ break;
+ case PMN1:
+ __asm__ __volatile__ ("mrc p14, 0, %0, c3, c0, 0" : "=r" (val));
+ break;
+ }
+ return val;
+}
+
+static u32 __xsc2_read_counter(int counter)
+{
+ u32 val = 0;
+
+ switch (counter) {
+ case CCNT:
+ __asm__ __volatile__ ("mrc p14, 0, %0, c1, c1, 0" : "=r" (val));
+ break;
+ case PMN0:
+ __asm__ __volatile__ ("mrc p14, 0, %0, c0, c2, 0" : "=r" (val));
+ break;
+ case PMN1:
+ __asm__ __volatile__ ("mrc p14, 0, %0, c1, c2, 0" : "=r" (val));
+ break;
+ case PMN2:
+ __asm__ __volatile__ ("mrc p14, 0, %0, c2, c2, 0" : "=r" (val));
+ break;
+ case PMN3:
+ __asm__ __volatile__ ("mrc p14, 0, %0, c3, c2, 0" : "=r" (val));
+ break;
+ }
+ return val;
+}
+
+static u32 read_counter(int counter)
+{
+ u32 val;
+
+ if (pmu->id == PMU_XSC1)
+ val = __xsc1_read_counter(counter);
+ else
+ val = __xsc2_read_counter(counter);
+
+ return val;
+}
+
+static void __xsc1_write_counter(int counter, u32 val)
+{
+ switch (counter) {
+ case CCNT:
+ __asm__ __volatile__ ("mcr p14, 0, %0, c1, c0, 0" : : "r" (val));
+ break;
+ case PMN0:
+ __asm__ __volatile__ ("mcr p14, 0, %0, c2, c0, 0" : : "r" (val));
+ break;
+ case PMN1:
+ __asm__ __volatile__ ("mcr p14, 0, %0, c3, c0, 0" : : "r" (val));
+ break;
+ }
+}
+
+static void __xsc2_write_counter(int counter, u32 val)
+{
+ switch (counter) {
+ case CCNT:
+ __asm__ __volatile__ ("mcr p14, 0, %0, c1, c1, 0" : : "r" (val));
+ break;
+ case PMN0:
+ __asm__ __volatile__ ("mcr p14, 0, %0, c0, c2, 0" : : "r" (val));
+ break;
+ case PMN1:
+ __asm__ __volatile__ ("mcr p14, 0, %0, c1, c2, 0" : : "r" (val));
+ break;
+ case PMN2:
+ __asm__ __volatile__ ("mcr p14, 0, %0, c2, c2, 0" : : "r" (val));
+ break;
+ case PMN3:
+ __asm__ __volatile__ ("mcr p14, 0, %0, c3, c2, 0" : : "r" (val));
+ break;
+ }
+}
+
+static void write_counter(int counter, u32 val)
+{
+ if (pmu->id == PMU_XSC1)
+ __xsc1_write_counter(counter, val);
+ else
+ __xsc2_write_counter(counter, val);
+}
+
+static int xscale_setup_ctrs(void)
+{
+ u32 evtsel, pmnc;
+ int i;
+
+ for (i = CCNT; i < MAX_COUNTERS; i++) {
+ if (counter_config[i].enabled)
+ continue;
+
+ counter_config[i].event = EVT_UNUSED;
+ }
+
+ switch (pmu->id) {
+ case PMU_XSC1:
+ pmnc = (counter_config[PMN1].event << 20) | (counter_config[PMN0].event << 12);
+ pr_debug("xscale_setup_ctrs: pmnc: %#08x\n", pmnc);
+ write_pmnc(pmnc);
+ break;
+
+ case PMU_XSC2:
+ evtsel = counter_config[PMN0].event | (counter_config[PMN1].event << 8) |
+ (counter_config[PMN2].event << 16) | (counter_config[PMN3].event << 24);
+
+ pr_debug("xscale_setup_ctrs: evtsel %#08x\n", evtsel);
+ __asm__ __volatile__ ("mcr p14, 0, %0, c8, c1, 0" : : "r" (evtsel));
+ break;
+ }
+
+ for (i = CCNT; i < MAX_COUNTERS; i++) {
+ if (counter_config[i].event == EVT_UNUSED) {
+ counter_config[i].event = 0;
+ pmu->int_enable &= ~pmu->int_mask[i];
+ continue;
+ }
+
+ results[i].reset_counter = counter_config[i].count;
+ write_counter(i, -(u32)counter_config[i].count);
+ pmu->int_enable |= pmu->int_mask[i];
+ pr_debug("xscale_setup_ctrs: counter%d %#08x from %#08lx\n", i,
+ read_counter(i), counter_config[i].count);
+ }
+
+ return 0;
+}
+
+static void inline __xsc1_check_ctrs(void)
+{
+ int i;
+ u32 pmnc = read_pmnc();
+
+ /* NOTE: there's an A stepping errata that states if an overflow */
+ /* bit already exists and another occurs, the previous */
+ /* Overflow bit gets cleared. There's no workaround. */
+ /* Fixed in B stepping or later */
+
+ /* Write the value back to clear the overflow flags. Overflow */
+ /* flags remain in pmnc for use below */
+ write_pmnc(pmnc & ~PMU_ENABLE);
+
+ for (i = CCNT; i <= PMN1; i++) {
+ if (!(pmu->int_mask[i] & pmu->int_enable))
+ continue;
+
+ if (pmnc & pmu->cnt_ovf[i])
+ results[i].ovf++;
+ }
+}
+
+static void inline __xsc2_check_ctrs(void)
+{
+ int i;
+ u32 flag = 0, pmnc = read_pmnc();
+
+ pmnc &= ~PMU_ENABLE;
+ write_pmnc(pmnc);
+
+ /* read overflow flag register */
+ __asm__ __volatile__ ("mrc p14, 0, %0, c5, c1, 0" : "=r" (flag));
+
+ for (i = CCNT; i <= PMN3; i++) {
+ if (!(pmu->int_mask[i] & pmu->int_enable))
+ continue;
+
+ if (flag & pmu->cnt_ovf[i])
+ results[i].ovf++;
+ }
+
+ /* writeback clears overflow bits */
+ __asm__ __volatile__ ("mcr p14, 0, %0, c5, c1, 0" : : "r" (flag));
+}
+
+static irqreturn_t xscale_pmu_interrupt(int irq, void *arg, struct pt_regs *regs)
+{
+ int i;
+ u32 pmnc;
+
+ if (pmu->id == PMU_XSC1)
+ __xsc1_check_ctrs();
+ else
+ __xsc2_check_ctrs();
+
+ for (i = CCNT; i < MAX_COUNTERS; i++) {
+ if (!results[i].ovf)
+ continue;
+
+ write_counter(i, -(u32)results[i].reset_counter);
+ oprofile_add_sample(regs, i);
+ results[i].ovf--;
+ }
+
+ pmnc = read_pmnc() | PMU_ENABLE;
+ write_pmnc(pmnc);
+
+ return IRQ_HANDLED;
+}
+
+static void xscale_pmu_stop(void)
+{
+ u32 pmnc = read_pmnc();
+
+ pmnc &= ~PMU_ENABLE;
+ write_pmnc(pmnc);
+
+ free_irq(XSCALE_PMU_IRQ, results);
+}
+
+static int xscale_pmu_start(void)
+{
+ int ret;
+ u32 pmnc = read_pmnc();
+
+ ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, SA_INTERRUPT,
+ "XScale PMU", (void *)results);
+
+ if (ret < 0) {
+ printk(KERN_ERR "oprofile: unable to request IRQ%d for XScale PMU\n",
+ XSCALE_PMU_IRQ);
+ return ret;
+ }
+
+ if (pmu->id == PMU_XSC1)
+ pmnc |= pmu->int_enable;
+ else {
+ __asm__ __volatile__ ("mcr p14, 0, %0, c4, c1, 0" : : "r" (pmu->int_enable));
+ pmnc &= ~PMU_CNT64;
+ }
+
+ pmnc |= PMU_ENABLE;
+ write_pmnc(pmnc);
+ pr_debug("xscale_pmu_start: pmnc: %#08x mask: %08x\n", pmnc, pmu->int_enable);
+ return 0;
+}
+
+static int xscale_detect_pmu(void)
+{
+ int ret = 0;
+ u32 id;
+
+ id = (read_cpuid(CPUID_ID) >> 13) & 0x7;
+
+ switch (id) {
+ case 1:
+ pmu = &pmu_parms[PMU_XSC1];
+ break;
+ case 2:
+ pmu = &pmu_parms[PMU_XSC2];
+ break;
+ default:
+ ret = -ENODEV;
+ break;
+ }
+
+ if (!ret) {
+ op_xscale_spec.name = pmu->name;
+ op_xscale_spec.num_counters = pmu->num_counters;
+ pr_debug("xscale_detect_pmu: detected %s PMU\n", pmu->name);
+ }
+
+ return ret;
+}
+
+struct op_arm_model_spec op_xscale_spec = {
+ .init = xscale_detect_pmu,
+ .setup_ctrs = xscale_setup_ctrs,
+ .start = xscale_pmu_start,
+ .stop = xscale_pmu_stop,
+};
+
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