1 files changed, 791 insertions, 0 deletions

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
new file mode 100644
index 00000000..26b8a851
--- /dev/null
+++ b/arch/x86/oprofile/nmi_int.c
@@ -0,0 +1,791 @@
+/**
+ * @file nmi_int.c
+ *
+ * @remark Copyright 2002-2009 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author John Levon <levon@movementarian.org>
+ * @author Robert Richter <robert.richter@amd.com>
+ * @author Barry Kasindorf <barry.kasindorf@amd.com>
+ * @author Jason Yeh <jason.yeh@amd.com>
+ * @author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
+ */
+
+#include <linux/init.h>
+#include <linux/notifier.h>
+#include <linux/smp.h>
+#include <linux/oprofile.h>
+#include <linux/syscore_ops.h>
+#include <linux/slab.h>
+#include <linux/moduleparam.h>
+#include <linux/kdebug.h>
+#include <linux/cpu.h>
+#include <asm/nmi.h>
+#include <asm/msr.h>
+#include <asm/apic.h>
+
+#include "op_counter.h"
+#include "op_x86_model.h"
+
+static struct op_x86_model_spec *model;
+static DEFINE_PER_CPU(struct op_msrs, cpu_msrs);
+static DEFINE_PER_CPU(unsigned long, saved_lvtpc);
+
+/* must be protected with get_online_cpus()/put_online_cpus(): */
+static int nmi_enabled;
+static int ctr_running;
+
+struct op_counter_config counter_config[OP_MAX_COUNTER];
+
+/* common functions */
+
+u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
+		    struct op_counter_config *counter_config)
+{
+	u64 val = 0;
+	u16 event = (u16)counter_config->event;
+
+	val |= ARCH_PERFMON_EVENTSEL_INT;
+	val |= counter_config->user ? ARCH_PERFMON_EVENTSEL_USR : 0;
+	val |= counter_config->kernel ? ARCH_PERFMON_EVENTSEL_OS : 0;
+	val |= (counter_config->unit_mask & 0xFF) << 8;
+	counter_config->extra &= (ARCH_PERFMON_EVENTSEL_INV |
+				  ARCH_PERFMON_EVENTSEL_EDGE |
+				  ARCH_PERFMON_EVENTSEL_CMASK);
+	val |= counter_config->extra;
+	event &= model->event_mask ? model->event_mask : 0xFF;
+	val |= event & 0xFF;
+	val |= (event & 0x0F00) << 24;
+
+	return val;
+}
+
+
+static int profile_exceptions_notify(unsigned int val, struct pt_regs *regs)
+{
+	if (ctr_running)
+		model->check_ctrs(regs, &__get_cpu_var(cpu_msrs));
+	else if (!nmi_enabled)
+		return NMI_DONE;
+	else
+		model->stop(&__get_cpu_var(cpu_msrs));
+	return NMI_HANDLED;
+}
+
+static void nmi_cpu_save_registers(struct op_msrs *msrs)
+{
+	struct op_msr *counters = msrs->counters;
+	struct op_msr *controls = msrs->controls;
+	unsigned int i;
+
+	for (i = 0; i < model->num_counters; ++i) {
+		if (counters[i].addr)
+			rdmsrl(counters[i].addr, counters[i].saved);
+	}
+
+	for (i = 0; i < model->num_controls; ++i) {
+		if (controls[i].addr)
+			rdmsrl(controls[i].addr, controls[i].saved);
+	}
+}
+
+static void nmi_cpu_start(void *dummy)
+{
+	struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
+	if (!msrs->controls)
+		WARN_ON_ONCE(1);
+	else
+		model->start(msrs);
+}
+
+static int nmi_start(void)
+{
+	get_online_cpus();
+	ctr_running = 1;
+	/* make ctr_running visible to the nmi handler: */
+	smp_mb();
+	on_each_cpu(nmi_cpu_start, NULL, 1);
+	put_online_cpus();
+	return 0;
+}
+
+static void nmi_cpu_stop(void *dummy)
+{
+	struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
+	if (!msrs->controls)
+		WARN_ON_ONCE(1);
+	else
+		model->stop(msrs);
+}
+
+static void nmi_stop(void)
+{
+	get_online_cpus();
+	on_each_cpu(nmi_cpu_stop, NULL, 1);
+	ctr_running = 0;
+	put_online_cpus();
+}
+
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+
+static DEFINE_PER_CPU(int, switch_index);
+
+static inline int has_mux(void)
+{
+	return !!model->switch_ctrl;
+}
+
+inline int op_x86_phys_to_virt(int phys)
+{
+	return __this_cpu_read(switch_index) + phys;
+}
+
+inline int op_x86_virt_to_phys(int virt)
+{
+	return virt % model->num_counters;
+}
+
+static void nmi_shutdown_mux(void)
+{
+	int i;
+
+	if (!has_mux())
+		return;
+
+	for_each_possible_cpu(i) {
+		kfree(per_cpu(cpu_msrs, i).multiplex);
+		per_cpu(cpu_msrs, i).multiplex = NULL;
+		per_cpu(switch_index, i) = 0;
+	}
+}
+
+static int nmi_setup_mux(void)
+{
+	size_t multiplex_size =
+		sizeof(struct op_msr) * model->num_virt_counters;
+	int i;
+
+	if (!has_mux())
+		return 1;
+
+	for_each_possible_cpu(i) {
+		per_cpu(cpu_msrs, i).multiplex =
+			kzalloc(multiplex_size, GFP_KERNEL);
+		if (!per_cpu(cpu_msrs, i).multiplex)
+			return 0;
+	}
+
+	return 1;
+}
+
+static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
+{
+	int i;
+	struct op_msr *multiplex = msrs->multiplex;
+
+	if (!has_mux())
+		return;
+
+	for (i = 0; i < model->num_virt_counters; ++i) {
+		if (counter_config[i].enabled) {
+			multiplex[i].saved = -(u64)counter_config[i].count;
+		} else {
+			multiplex[i].saved = 0;
+		}
+	}
+
+	per_cpu(switch_index, cpu) = 0;
+}
+
+static void nmi_cpu_save_mpx_registers(struct op_msrs *msrs)
+{
+	struct op_msr *counters = msrs->counters;
+	struct op_msr *multiplex = msrs->multiplex;
+	int i;
+
+	for (i = 0; i < model->num_counters; ++i) {
+		int virt = op_x86_phys_to_virt(i);
+		if (counters[i].addr)
+			rdmsrl(counters[i].addr, multiplex[virt].saved);
+	}
+}
+
+static void nmi_cpu_restore_mpx_registers(struct op_msrs *msrs)
+{
+	struct op_msr *counters = msrs->counters;
+	struct op_msr *multiplex = msrs->multiplex;
+	int i;
+
+	for (i = 0; i < model->num_counters; ++i) {
+		int virt = op_x86_phys_to_virt(i);
+		if (counters[i].addr)
+			wrmsrl(counters[i].addr, multiplex[virt].saved);
+	}
+}
+
+static void nmi_cpu_switch(void *dummy)
+{
+	int cpu = smp_processor_id();
+	int si = per_cpu(switch_index, cpu);
+	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
+
+	nmi_cpu_stop(NULL);
+	nmi_cpu_save_mpx_registers(msrs);
+
+	/* move to next set */
+	si += model->num_counters;
+	if ((si >= model->num_virt_counters) || (counter_config[si].count == 0))
+		per_cpu(switch_index, cpu) = 0;
+	else
+		per_cpu(switch_index, cpu) = si;
+
+	model->switch_ctrl(model, msrs);
+	nmi_cpu_restore_mpx_registers(msrs);
+
+	nmi_cpu_start(NULL);
+}
+
+
+/*
+ * Quick check to see if multiplexing is necessary.
+ * The check should be sufficient since counters are used
+ * in ordre.
+ */
+static int nmi_multiplex_on(void)
+{
+	return counter_config[model->num_counters].count ? 0 : -EINVAL;
+}
+
+static int nmi_switch_event(void)
+{
+	if (!has_mux())
+		return -ENOSYS;		/* not implemented */
+	if (nmi_multiplex_on() < 0)
+		return -EINVAL;		/* not necessary */
+
+	get_online_cpus();
+	if (ctr_running)
+		on_each_cpu(nmi_cpu_switch, NULL, 1);
+	put_online_cpus();
+
+	return 0;
+}
+
+static inline void mux_init(struct oprofile_operations *ops)
+{
+	if (has_mux())
+		ops->switch_events = nmi_switch_event;
+}
+
+static void mux_clone(int cpu)
+{
+	if (!has_mux())
+		return;
+
+	memcpy(per_cpu(cpu_msrs, cpu).multiplex,
+	       per_cpu(cpu_msrs, 0).multiplex,
+	       sizeof(struct op_msr) * model->num_virt_counters);
+}
+
+#else
+
+inline int op_x86_phys_to_virt(int phys) { return phys; }
+inline int op_x86_virt_to_phys(int virt) { return virt; }
+static inline void nmi_shutdown_mux(void) { }
+static inline int nmi_setup_mux(void) { return 1; }
+static inline void
+nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs) { }
+static inline void mux_init(struct oprofile_operations *ops) { }
+static void mux_clone(int cpu) { }
+
+#endif
+
+static void free_msrs(void)
+{
+	int i;
+	for_each_possible_cpu(i) {
+		kfree(per_cpu(cpu_msrs, i).counters);
+		per_cpu(cpu_msrs, i).counters = NULL;
+		kfree(per_cpu(cpu_msrs, i).controls);
+		per_cpu(cpu_msrs, i).controls = NULL;
+	}
+	nmi_shutdown_mux();
+}
+
+static int allocate_msrs(void)
+{
+	size_t controls_size = sizeof(struct op_msr) * model->num_controls;
+	size_t counters_size = sizeof(struct op_msr) * model->num_counters;
+
+	int i;
+	for_each_possible_cpu(i) {
+		per_cpu(cpu_msrs, i).counters = kzalloc(counters_size,
+							GFP_KERNEL);
+		if (!per_cpu(cpu_msrs, i).counters)
+			goto fail;
+		per_cpu(cpu_msrs, i).controls = kzalloc(controls_size,
+							GFP_KERNEL);
+		if (!per_cpu(cpu_msrs, i).controls)
+			goto fail;
+	}
+
+	if (!nmi_setup_mux())
+		goto fail;
+
+	return 1;
+
+fail:
+	free_msrs();
+	return 0;
+}
+
+static void nmi_cpu_setup(void *dummy)
+{
+	int cpu = smp_processor_id();
+	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
+	nmi_cpu_save_registers(msrs);
+	raw_spin_lock(&oprofilefs_lock);
+	model->setup_ctrs(model, msrs);
+	nmi_cpu_setup_mux(cpu, msrs);
+	raw_spin_unlock(&oprofilefs_lock);
+	per_cpu(saved_lvtpc, cpu) = apic_read(APIC_LVTPC);
+	apic_write(APIC_LVTPC, APIC_DM_NMI);
+}
+
+static void nmi_cpu_restore_registers(struct op_msrs *msrs)
+{
+	struct op_msr *counters = msrs->counters;
+	struct op_msr *controls = msrs->controls;
+	unsigned int i;
+
+	for (i = 0; i < model->num_controls; ++i) {
+		if (controls[i].addr)
+			wrmsrl(controls[i].addr, controls[i].saved);
+	}
+
+	for (i = 0; i < model->num_counters; ++i) {
+		if (counters[i].addr)
+			wrmsrl(counters[i].addr, counters[i].saved);
+	}
+}
+
+static void nmi_cpu_shutdown(void *dummy)
+{
+	unsigned int v;
+	int cpu = smp_processor_id();
+	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
+
+	/* restoring APIC_LVTPC can trigger an apic error because the delivery
+	 * mode and vector nr combination can be illegal. That's by design: on
+	 * power on apic lvt contain a zero vector nr which are legal only for
+	 * NMI delivery mode. So inhibit apic err before restoring lvtpc
+	 */
+	v = apic_read(APIC_LVTERR);
+	apic_write(APIC_LVTERR, v | APIC_LVT_MASKED);
+	apic_write(APIC_LVTPC, per_cpu(saved_lvtpc, cpu));
+	apic_write(APIC_LVTERR, v);
+	nmi_cpu_restore_registers(msrs);
+}
+
+static void nmi_cpu_up(void *dummy)
+{
+	if (nmi_enabled)
+		nmi_cpu_setup(dummy);
+	if (ctr_running)
+		nmi_cpu_start(dummy);
+}
+
+static void nmi_cpu_down(void *dummy)
+{
+	if (ctr_running)
+		nmi_cpu_stop(dummy);
+	if (nmi_enabled)
+		nmi_cpu_shutdown(dummy);
+}
+
+static int nmi_create_files(struct super_block *sb, struct dentry *root)
+{
+	unsigned int i;
+
+	for (i = 0; i < model->num_virt_counters; ++i) {
+		struct dentry *dir;
+		char buf[4];
+
+		/* quick little hack to _not_ expose a counter if it is not
+		 * available for use.  This should protect userspace app.
+		 * NOTE:  assumes 1:1 mapping here (that counters are organized
+		 *        sequentially in their struct assignment).
+		 */
+		if (!avail_to_resrv_perfctr_nmi_bit(op_x86_virt_to_phys(i)))
+			continue;
+
+		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);
+		oprofilefs_create_ulong(sb, dir, "extra", &counter_config[i].extra);
+	}
+
+	return 0;
+}
+
+static int oprofile_cpu_notifier(struct notifier_block *b, unsigned long action,
+				 void *data)
+{
+	int cpu = (unsigned long)data;
+	switch (action) {
+	case CPU_DOWN_FAILED:
+	case CPU_ONLINE:
+		smp_call_function_single(cpu, nmi_cpu_up, NULL, 0);
+		break;
+	case CPU_DOWN_PREPARE:
+		smp_call_function_single(cpu, nmi_cpu_down, NULL, 1);
+		break;
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block oprofile_cpu_nb = {
+	.notifier_call = oprofile_cpu_notifier
+};
+
+static int nmi_setup(void)
+{
+	int err = 0;
+	int cpu;
+
+	if (!allocate_msrs())
+		return -ENOMEM;
+
+	/* We need to serialize save and setup for HT because the subset
+	 * of msrs are distinct for save and setup operations
+	 */
+
+	/* Assume saved/restored counters are the same on all CPUs */
+	err = model->fill_in_addresses(&per_cpu(cpu_msrs, 0));
+	if (err)
+		goto fail;
+
+	for_each_possible_cpu(cpu) {
+		if (!cpu)
+			continue;
+
+		memcpy(per_cpu(cpu_msrs, cpu).counters,
+		       per_cpu(cpu_msrs, 0).counters,
+		       sizeof(struct op_msr) * model->num_counters);
+
+		memcpy(per_cpu(cpu_msrs, cpu).controls,
+		       per_cpu(cpu_msrs, 0).controls,
+		       sizeof(struct op_msr) * model->num_controls);
+
+		mux_clone(cpu);
+	}
+
+	nmi_enabled = 0;
+	ctr_running = 0;
+	/* make variables visible to the nmi handler: */
+	smp_mb();
+	err = register_nmi_handler(NMI_LOCAL, profile_exceptions_notify,
+					0, "oprofile");
+	if (err)
+		goto fail;
+
+	get_online_cpus();
+	register_cpu_notifier(&oprofile_cpu_nb);
+	nmi_enabled = 1;
+	/* make nmi_enabled visible to the nmi handler: */
+	smp_mb();
+	on_each_cpu(nmi_cpu_setup, NULL, 1);
+	put_online_cpus();
+
+	return 0;
+fail:
+	free_msrs();
+	return err;
+}
+
+static void nmi_shutdown(void)
+{
+	struct op_msrs *msrs;
+
+	get_online_cpus();
+	unregister_cpu_notifier(&oprofile_cpu_nb);
+	on_each_cpu(nmi_cpu_shutdown, NULL, 1);
+	nmi_enabled = 0;
+	ctr_running = 0;
+	put_online_cpus();
+	/* make variables visible to the nmi handler: */
+	smp_mb();
+	unregister_nmi_handler(NMI_LOCAL, "oprofile");
+	msrs = &get_cpu_var(cpu_msrs);
+	model->shutdown(msrs);
+	free_msrs();
+	put_cpu_var(cpu_msrs);
+}
+
+#ifdef CONFIG_PM
+
+static int nmi_suspend(void)
+{
+	/* Only one CPU left, just stop that one */
+	if (nmi_enabled == 1)
+		nmi_cpu_stop(NULL);
+	return 0;
+}
+
+static void nmi_resume(void)
+{
+	if (nmi_enabled == 1)
+		nmi_cpu_start(NULL);
+}
+
+static struct syscore_ops oprofile_syscore_ops = {
+	.resume		= nmi_resume,
+	.suspend	= nmi_suspend,
+};
+
+static void __init init_suspend_resume(void)
+{
+	register_syscore_ops(&oprofile_syscore_ops);
+}
+
+static void exit_suspend_resume(void)
+{
+	unregister_syscore_ops(&oprofile_syscore_ops);
+}
+
+#else
+
+static inline void init_suspend_resume(void) { }
+static inline void exit_suspend_resume(void) { }
+
+#endif /* CONFIG_PM */
+
+static int __init p4_init(char **cpu_type)
+{
+	__u8 cpu_model = boot_cpu_data.x86_model;
+
+	if (cpu_model > 6 || cpu_model == 5)
+		return 0;
+
+#ifndef CONFIG_SMP
+	*cpu_type = "i386/p4";
+	model = &op_p4_spec;
+	return 1;
+#else
+	switch (smp_num_siblings) {
+	case 1:
+		*cpu_type = "i386/p4";
+		model = &op_p4_spec;
+		return 1;
+
+	case 2:
+		*cpu_type = "i386/p4-ht";
+		model = &op_p4_ht2_spec;
+		return 1;
+	}
+#endif
+
+	printk(KERN_INFO "oprofile: P4 HyperThreading detected with > 2 threads\n");
+	printk(KERN_INFO "oprofile: Reverting to timer mode.\n");
+	return 0;
+}
+
+enum __force_cpu_type {
+	reserved = 0,		/* do not force */
+	timer,
+	arch_perfmon,
+};
+
+static int force_cpu_type;
+
+static int set_cpu_type(const char *str, struct kernel_param *kp)
+{
+	if (!strcmp(str, "timer")) {
+		force_cpu_type = timer;
+		printk(KERN_INFO "oprofile: forcing NMI timer mode\n");
+	} else if (!strcmp(str, "arch_perfmon")) {
+		force_cpu_type = arch_perfmon;
+		printk(KERN_INFO "oprofile: forcing architectural perfmon\n");
+	} else {
+		force_cpu_type = 0;
+	}
+
+	return 0;
+}
+module_param_call(cpu_type, set_cpu_type, NULL, NULL, 0);
+
+static int __init ppro_init(char **cpu_type)
+{
+	__u8 cpu_model = boot_cpu_data.x86_model;
+	struct op_x86_model_spec *spec = &op_ppro_spec;	/* default */
+
+	if (force_cpu_type == arch_perfmon && cpu_has_arch_perfmon)
+		return 0;
+
+	/*
+	 * Documentation on identifying Intel processors by CPU family
+	 * and model can be found in the Intel Software Developer's
+	 * Manuals (SDM):
+	 *
+	 *  http://www.intel.com/products/processor/manuals/
+	 *
+	 * As of May 2010 the documentation for this was in the:
+	 * "Intel 64 and IA-32 Architectures Software Developer's
+	 * Manual Volume 3B: System Programming Guide", "Table B-1
+	 * CPUID Signature Values of DisplayFamily_DisplayModel".
+	 */
+	switch (cpu_model) {
+	case 0 ... 2:
+		*cpu_type = "i386/ppro";
+		break;
+	case 3 ... 5:
+		*cpu_type = "i386/pii";
+		break;
+	case 6 ... 8:
+	case 10 ... 11:
+		*cpu_type = "i386/piii";
+		break;
+	case 9:
+	case 13:
+		*cpu_type = "i386/p6_mobile";
+		break;
+	case 14:
+		*cpu_type = "i386/core";
+		break;
+	case 0x0f:
+	case 0x16:
+	case 0x17:
+	case 0x1d:
+		*cpu_type = "i386/core_2";
+		break;
+	case 0x1a:
+	case 0x1e:
+	case 0x2e:
+		spec = &op_arch_perfmon_spec;
+		*cpu_type = "i386/core_i7";
+		break;
+	case 0x1c:
+		*cpu_type = "i386/atom";
+		break;
+	default:
+		/* Unknown */
+		return 0;
+	}
+
+	model = spec;
+	return 1;
+}
+
+int __init op_nmi_init(struct oprofile_operations *ops)
+{
+	__u8 vendor = boot_cpu_data.x86_vendor;
+	__u8 family = boot_cpu_data.x86;
+	char *cpu_type = NULL;
+	int ret = 0;
+
+	if (!cpu_has_apic)
+		return -ENODEV;
+
+	if (force_cpu_type == timer)
+		return -ENODEV;
+
+	switch (vendor) {
+	case X86_VENDOR_AMD:
+		/* Needs to be at least an Athlon (or hammer in 32bit mode) */
+
+		switch (family) {
+		case 6:
+			cpu_type = "i386/athlon";
+			break;
+		case 0xf:
+			/*
+			 * Actually it could be i386/hammer too, but
+			 * give user space an consistent name.
+			 */
+			cpu_type = "x86-64/hammer";
+			break;
+		case 0x10:
+			cpu_type = "x86-64/family10";
+			break;
+		case 0x11:
+			cpu_type = "x86-64/family11h";
+			break;
+		case 0x12:
+			cpu_type = "x86-64/family12h";
+			break;
+		case 0x14:
+			cpu_type = "x86-64/family14h";
+			break;
+		case 0x15:
+			cpu_type = "x86-64/family15h";
+			break;
+		default:
+			return -ENODEV;
+		}
+		model = &op_amd_spec;
+		break;
+
+	case X86_VENDOR_INTEL:
+		switch (family) {
+			/* Pentium IV */
+		case 0xf:
+			p4_init(&cpu_type);
+			break;
+
+			/* A P6-class processor */
+		case 6:
+			ppro_init(&cpu_type);
+			break;
+
+		default:
+			break;
+		}
+
+		if (cpu_type)
+			break;
+
+		if (!cpu_has_arch_perfmon)
+			return -ENODEV;
+
+		/* use arch perfmon as fallback */
+		cpu_type = "i386/arch_perfmon";
+		model = &op_arch_perfmon_spec;
+		break;
+
+	default:
+		return -ENODEV;
+	}
+
+	/* default values, can be overwritten by model */
+	ops->create_files	= nmi_create_files;
+	ops->setup		= nmi_setup;
+	ops->shutdown		= nmi_shutdown;
+	ops->start		= nmi_start;
+	ops->stop		= nmi_stop;
+	ops->cpu_type		= cpu_type;
+
+	if (model->init)
+		ret = model->init(ops);
+	if (ret)
+		return ret;
+
+	if (!model->num_virt_counters)
+		model->num_virt_counters = model->num_counters;
+
+	mux_init(ops);
+
+	init_suspend_resume();
+
+	printk(KERN_INFO "oprofile: using NMI interrupt.\n");
+	return 0;
+}
+
+void op_nmi_exit(void)
+{
+	exit_suspend_resume();
+}