arch/x86/oprofile/op_model_amd.c - third_party/linux - Git at Google

 /*
  * @file op_model_amd.c
  * athlon / K7 / K8 / Family 10h model-specific MSR operations
  *
  * @remark Copyright 2002-2008 OProfile authors
  * @remark Read the file COPYING
  *
  * @author John Levon
  * @author Philippe Elie
  * @author Graydon Hoare
  * @author Robert Richter <robert.richter@amd.com>
  * @author Barry Kasindorf
 */

 #include <linux/oprofile.h>
 #include <linux/device.h>
 #include <linux/pci.h>

 #include <asm/ptrace.h>
 #include <asm/msr.h>
 #include <asm/nmi.h>

 #include "op_x86_model.h"
 #include "op_counter.h"

 #define NUM_COUNTERS 4
 #define NUM_CONTROLS 4

 #define CTR_IS_RESERVED(msrs, c) (msrs->counters[(c)].addr ? 1 : 0)
 #define CTR_READ(l, h, msrs, c) do {rdmsr(msrs->counters[(c)].addr, (l), (h)); } while (0)
 #define CTR_WRITE(l, msrs, c) do {wrmsr(msrs->counters[(c)].addr, -(unsigned int)(l), -1); } while (0)
 #define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))

 #define CTRL_IS_RESERVED(msrs, c) (msrs->controls[(c)].addr ? 1 : 0)
 #define CTRL_READ(l, h, msrs, c) do {rdmsr(msrs->controls[(c)].addr, (l), (h)); } while (0)
 #define CTRL_WRITE(l, h, msrs, c) do {wrmsr(msrs->controls[(c)].addr, (l), (h)); } while (0)
 #define CTRL_SET_ACTIVE(n) (n |= (1<<22))
 #define CTRL_SET_INACTIVE(n) (n &= ~(1<<22))
 #define CTRL_CLEAR_LO(x) (x &= (1<<21))
 #define CTRL_CLEAR_HI(x) (x &= 0xfffffcf0)
 #define CTRL_SET_ENABLE(val) (val |= 1<<20)
 #define CTRL_SET_USR(val, u) (val |= ((u & 1) << 16))
 #define CTRL_SET_KERN(val, k) (val |= ((k & 1) << 17))
 #define CTRL_SET_UM(val, m) (val |= (m << 8))
 #define CTRL_SET_EVENT_LOW(val, e) (val |= (e & 0xff))
 #define CTRL_SET_EVENT_HIGH(val, e) (val |= ((e >> 8) & 0xf))
 #define CTRL_SET_HOST_ONLY(val, h) (val |= ((h & 1) << 9))
 #define CTRL_SET_GUEST_ONLY(val, h) (val |= ((h & 1) << 8))

 static unsigned long reset_value[NUM_COUNTERS];

 #ifdef CONFIG_OPROFILE_IBS

 /* IbsFetchCtl bits/masks */
 #define IBS_FETCH_HIGH_VALID_BIT	(1UL << 17)	/* bit 49 */
 #define IBS_FETCH_HIGH_ENABLE		(1UL << 16)	/* bit 48 */
 #define IBS_FETCH_LOW_MAX_CNT_MASK	0x0000FFFFUL	/* MaxCnt mask */

 /*IbsOpCtl bits */
 #define IBS_OP_LOW_VALID_BIT		(1ULL<<18)	/* bit 18 */
 #define IBS_OP_LOW_ENABLE		(1ULL<<17)	/* bit 17 */

 /* Codes used in cpu_buffer.c */
 /* This produces duplicate code, need to be fixed */
 #define IBS_FETCH_BEGIN 3
 #define IBS_OP_BEGIN    4

 /* The function interface needs to be fixed, something like add
    data. Should then be added to linux/oprofile.h. */
 extern void
 oprofile_add_ibs_sample(struct pt_regs *const regs,
 			unsigned int * const ibs_sample, int ibs_code);

 struct ibs_fetch_sample {
 	/* MSRC001_1031 IBS Fetch Linear Address Register */
 	unsigned int ibs_fetch_lin_addr_low;
 	unsigned int ibs_fetch_lin_addr_high;
 	/* MSRC001_1030 IBS Fetch Control Register */
 	unsigned int ibs_fetch_ctl_low;
 	unsigned int ibs_fetch_ctl_high;
 	/* MSRC001_1032 IBS Fetch Physical Address Register */
 	unsigned int ibs_fetch_phys_addr_low;
 	unsigned int ibs_fetch_phys_addr_high;
 };

 struct ibs_op_sample {
 	/* MSRC001_1034 IBS Op Logical Address Register (IbsRIP) */
 	unsigned int ibs_op_rip_low;
 	unsigned int ibs_op_rip_high;
 	/* MSRC001_1035 IBS Op Data Register */
 	unsigned int ibs_op_data1_low;
 	unsigned int ibs_op_data1_high;
 	/* MSRC001_1036 IBS Op Data 2 Register */
 	unsigned int ibs_op_data2_low;
 	unsigned int ibs_op_data2_high;
 	/* MSRC001_1037 IBS Op Data 3 Register */
 	unsigned int ibs_op_data3_low;
 	unsigned int ibs_op_data3_high;
 	/* MSRC001_1038 IBS DC Linear Address Register (IbsDcLinAd) */
 	unsigned int ibs_dc_linear_low;
 	unsigned int ibs_dc_linear_high;
 	/* MSRC001_1039 IBS DC Physical Address Register (IbsDcPhysAd) */
 	unsigned int ibs_dc_phys_low;
 	unsigned int ibs_dc_phys_high;
 };

 /*
  * unitialize the APIC for the IBS interrupts if needed on AMD Family10h+
 */
 static void clear_ibs_nmi(void);

 static int ibs_allowed;	/* AMD Family10h and later */

 struct op_ibs_config {
 	unsigned long op_enabled;
 	unsigned long fetch_enabled;
 	unsigned long max_cnt_fetch;
 	unsigned long max_cnt_op;
 	unsigned long rand_en;
 	unsigned long dispatched_ops;
 };

 static struct op_ibs_config ibs_config;

 #endif

 /* functions for op_amd_spec */

 static void op_amd_fill_in_addresses(struct op_msrs * const msrs)
 {
 	int i;

 	for (i = 0; i < NUM_COUNTERS; i++) {
 		if (reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
 			msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
 		else
 			msrs->counters[i].addr = 0;
 	}

 	for (i = 0; i < NUM_CONTROLS; i++) {
 		if (reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i))
 			msrs->controls[i].addr = MSR_K7_EVNTSEL0 + i;
 		else
 			msrs->controls[i].addr = 0;
 	}
 }


 static void op_amd_setup_ctrs(struct op_msrs const * const msrs)
 {
 	unsigned int low, high;
 	int i;

 	/* clear all counters */
 	for (i = 0 ; i < NUM_CONTROLS; ++i) {
 		if (unlikely(!CTRL_IS_RESERVED(msrs, i)))
 			continue;
 		CTRL_READ(low, high, msrs, i);
 		CTRL_CLEAR_LO(low);
 		CTRL_CLEAR_HI(high);
 		CTRL_WRITE(low, high, msrs, i);
 	}

 	/* avoid a false detection of ctr overflows in NMI handler */
 	for (i = 0; i < NUM_COUNTERS; ++i) {
 		if (unlikely(!CTR_IS_RESERVED(msrs, i)))
 			continue;
 		CTR_WRITE(1, msrs, i);
 	}

 	/* enable active counters */
 	for (i = 0; i < NUM_COUNTERS; ++i) {
 		if ((counter_config[i].enabled) && (CTR_IS_RESERVED(msrs, i))) {
 			reset_value[i] = counter_config[i].count;

 			CTR_WRITE(counter_config[i].count, msrs, i);

 			CTRL_READ(low, high, msrs, i);
 			CTRL_CLEAR_LO(low);
 			CTRL_CLEAR_HI(high);
 			CTRL_SET_ENABLE(low);
 			CTRL_SET_USR(low, counter_config[i].user);
 			CTRL_SET_KERN(low, counter_config[i].kernel);
 			CTRL_SET_UM(low, counter_config[i].unit_mask);
 			CTRL_SET_EVENT_LOW(low, counter_config[i].event);
 			CTRL_SET_EVENT_HIGH(high, counter_config[i].event);
 			CTRL_SET_HOST_ONLY(high, 0);
 			CTRL_SET_GUEST_ONLY(high, 0);

 			CTRL_WRITE(low, high, msrs, i);
 		} else {
 			reset_value[i] = 0;
 		}
 	}
 }

 #ifdef CONFIG_OPROFILE_IBS

 static inline int
 op_amd_handle_ibs(struct pt_regs * const regs,
 		  struct op_msrs const * const msrs)
 {
 	unsigned int low, high;
 	struct ibs_fetch_sample ibs_fetch;
 	struct ibs_op_sample ibs_op;

 	if (!ibs_allowed)
 		return 1;

 	if (ibs_config.fetch_enabled) {
 		rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
 		if (high & IBS_FETCH_HIGH_VALID_BIT) {
 			ibs_fetch.ibs_fetch_ctl_high = high;
 			ibs_fetch.ibs_fetch_ctl_low = low;
 			rdmsr(MSR_AMD64_IBSFETCHLINAD, low, high);
 			ibs_fetch.ibs_fetch_lin_addr_high = high;
 			ibs_fetch.ibs_fetch_lin_addr_low = low;
 			rdmsr(MSR_AMD64_IBSFETCHPHYSAD, low, high);
 			ibs_fetch.ibs_fetch_phys_addr_high = high;
 			ibs_fetch.ibs_fetch_phys_addr_low = low;

 			oprofile_add_ibs_sample(regs,
 						(unsigned int *)&ibs_fetch,
 						IBS_FETCH_BEGIN);

 			/*reenable the IRQ */
 			rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
 			high &= ~IBS_FETCH_HIGH_VALID_BIT;
 			high |= IBS_FETCH_HIGH_ENABLE;
 			low &= IBS_FETCH_LOW_MAX_CNT_MASK;
 			wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
 		}
 	}

 	if (ibs_config.op_enabled) {
 		rdmsr(MSR_AMD64_IBSOPCTL, low, high);
 		if (low & IBS_OP_LOW_VALID_BIT) {
 			rdmsr(MSR_AMD64_IBSOPRIP, low, high);
 			ibs_op.ibs_op_rip_low = low;
 			ibs_op.ibs_op_rip_high = high;
 			rdmsr(MSR_AMD64_IBSOPDATA, low, high);
 			ibs_op.ibs_op_data1_low = low;
 			ibs_op.ibs_op_data1_high = high;
 			rdmsr(MSR_AMD64_IBSOPDATA2, low, high);
 			ibs_op.ibs_op_data2_low = low;
 			ibs_op.ibs_op_data2_high = high;
 			rdmsr(MSR_AMD64_IBSOPDATA3, low, high);
 			ibs_op.ibs_op_data3_low = low;
 			ibs_op.ibs_op_data3_high = high;
 			rdmsr(MSR_AMD64_IBSDCLINAD, low, high);
 			ibs_op.ibs_dc_linear_low = low;
 			ibs_op.ibs_dc_linear_high = high;
 			rdmsr(MSR_AMD64_IBSDCPHYSAD, low, high);
 			ibs_op.ibs_dc_phys_low = low;
 			ibs_op.ibs_dc_phys_high = high;

 			/* reenable the IRQ */
 			oprofile_add_ibs_sample(regs,
 						(unsigned int *)&ibs_op,
 						IBS_OP_BEGIN);
 			rdmsr(MSR_AMD64_IBSOPCTL, low, high);
 			high = 0;
 			low &= ~IBS_OP_LOW_VALID_BIT;
 			low |= IBS_OP_LOW_ENABLE;
 			wrmsr(MSR_AMD64_IBSOPCTL, low, high);
 		}
 	}

 	return 1;
 }

 #endif

 static int op_amd_check_ctrs(struct pt_regs * const regs,
 			     struct op_msrs const * const msrs)
 {
 	unsigned int low, high;
 	int i;

 	for (i = 0 ; i < NUM_COUNTERS; ++i) {
 		if (!reset_value[i])
 			continue;
 		CTR_READ(low, high, msrs, i);
 		if (CTR_OVERFLOWED(low)) {
 			oprofile_add_sample(regs, i);
 			CTR_WRITE(reset_value[i], msrs, i);
 		}
 	}

 #ifdef CONFIG_OPROFILE_IBS
 	op_amd_handle_ibs(regs, msrs);
 #endif

 	/* See op_model_ppro.c */
 	return 1;
 }

 static void op_amd_start(struct op_msrs const * const msrs)
 {
 	unsigned int low, high;
 	int i;
 	for (i = 0 ; i < NUM_COUNTERS ; ++i) {
 		if (reset_value[i]) {
 			CTRL_READ(low, high, msrs, i);
 			CTRL_SET_ACTIVE(low);
 			CTRL_WRITE(low, high, msrs, i);
 		}
 	}

 #ifdef CONFIG_OPROFILE_IBS
 	if (ibs_allowed && ibs_config.fetch_enabled) {
 		low = (ibs_config.max_cnt_fetch >> 4) & 0xFFFF;
 		high = IBS_FETCH_HIGH_ENABLE;
 		wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
 	}

 	if (ibs_allowed && ibs_config.op_enabled) {
 		low = ((ibs_config.max_cnt_op >> 4) & 0xFFFF) + IBS_OP_LOW_ENABLE;
 		high = 0;
 		wrmsr(MSR_AMD64_IBSOPCTL, low, high);
 	}
 #endif
 }


 static void op_amd_stop(struct op_msrs const * const msrs)
 {
 	unsigned int low, high;
 	int i;

 	/* Subtle: stop on all counters to avoid race with
 	 * setting our pm callback */
 	for (i = 0 ; i < NUM_COUNTERS ; ++i) {
 		if (!reset_value[i])
 			continue;
 		CTRL_READ(low, high, msrs, i);
 		CTRL_SET_INACTIVE(low);
 		CTRL_WRITE(low, high, msrs, i);
 	}

 #ifdef CONFIG_OPROFILE_IBS
 	if (ibs_allowed && ibs_config.fetch_enabled) {
 		low = 0;		/* clear max count and enable */
 		high = 0;
 		wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
 	}

 	if (ibs_allowed && ibs_config.op_enabled) {
 		low = 0;		/* clear max count and enable */
 		high = 0;
 		wrmsr(MSR_AMD64_IBSOPCTL, low, high);
 	}
 #endif
 }

 static void op_amd_shutdown(struct op_msrs const * const msrs)
 {
 	int i;

 	for (i = 0 ; i < NUM_COUNTERS ; ++i) {
 		if (CTR_IS_RESERVED(msrs, i))
 			release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
 	}
 	for (i = 0 ; i < NUM_CONTROLS ; ++i) {
 		if (CTRL_IS_RESERVED(msrs, i))
 			release_evntsel_nmi(MSR_K7_EVNTSEL0 + i);
 	}
 }

 #ifndef CONFIG_OPROFILE_IBS

 /* no IBS support */

 static int op_amd_init(struct oprofile_operations *ops)
 {
 	return 0;
 }

 static void op_amd_exit(void) {}

 #else

 static u8 ibs_eilvt_off;

 static inline void apic_init_ibs_nmi_per_cpu(void *arg)
 {
 	ibs_eilvt_off = setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_NMI, 0);
 }

 static inline void apic_clear_ibs_nmi_per_cpu(void *arg)
 {
 	setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 1);
 }

 static int pfm_amd64_setup_eilvt(void)
 {
 #define IBSCTL_LVTOFFSETVAL		(1 << 8)
 #define IBSCTL				0x1cc
 	struct pci_dev *cpu_cfg;
 	int nodes;
 	u32 value = 0;

 	/* per CPU setup */
 	on_each_cpu(apic_init_ibs_nmi_per_cpu, NULL, 1);

 	nodes = 0;
 	cpu_cfg = NULL;
 	do {
 		cpu_cfg = pci_get_device(PCI_VENDOR_ID_AMD,
 					 PCI_DEVICE_ID_AMD_10H_NB_MISC,
 					 cpu_cfg);
 		if (!cpu_cfg)
 			break;
 		++nodes;
 		pci_write_config_dword(cpu_cfg, IBSCTL, ibs_eilvt_off
 				       | IBSCTL_LVTOFFSETVAL);
 		pci_read_config_dword(cpu_cfg, IBSCTL, &value);
 		if (value != (ibs_eilvt_off | IBSCTL_LVTOFFSETVAL)) {
 			printk(KERN_DEBUG "Failed to setup IBS LVT offset, "
 				"IBSCTL = 0x%08x", value);
 			return 1;
 		}
 	} while (1);

 	if (!nodes) {
 		printk(KERN_DEBUG "No CPU node configured for IBS");
 		return 1;
 	}

 #ifdef CONFIG_NUMA
 	/* Sanity check */
 	/* Works only for 64bit with proper numa implementation. */
 	if (nodes != num_possible_nodes()) {
 		printk(KERN_DEBUG "Failed to setup CPU node(s) for IBS, "
 			"found: %d, expected %d",
 			nodes, num_possible_nodes());
 		return 1;
 	}
 #endif
 	return 0;
 }

 /*
  * initialize the APIC for the IBS interrupts
  * if available (AMD Family10h rev B0 and later)
  */
 static void setup_ibs(void)
 {
 	ibs_allowed = boot_cpu_has(X86_FEATURE_IBS);

 	if (!ibs_allowed)
 		return;

 	if (pfm_amd64_setup_eilvt()) {
 		ibs_allowed = 0;
 		return;
 	}

 	printk(KERN_INFO "oprofile: AMD IBS detected\n");
 }


 /*
  * unitialize the APIC for the IBS interrupts if needed on AMD Family10h
  * rev B0 and later */
 static void clear_ibs_nmi(void)
 {
 	if (ibs_allowed)
 		on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
 }

 static int (*create_arch_files)(struct super_block * sb, struct dentry * root);

 static int setup_ibs_files(struct super_block * sb, struct dentry * root)
 {
 	struct dentry *dir;
 	int ret = 0;

 	/* architecture specific files */
 	if (create_arch_files)
 		ret = create_arch_files(sb, root);

 	if (ret)
 		return ret;

 	if (!ibs_allowed)
 		return ret;

 	/* model specific files */

 	/* setup some reasonable defaults */
 	ibs_config.max_cnt_fetch = 250000;
 	ibs_config.fetch_enabled = 0;
 	ibs_config.max_cnt_op = 250000;
 	ibs_config.op_enabled = 0;
 	ibs_config.dispatched_ops = 1;

 	dir = oprofilefs_mkdir(sb, root, "ibs_fetch");
 	oprofilefs_create_ulong(sb, dir, "enable",
 				&ibs_config.fetch_enabled);
 	oprofilefs_create_ulong(sb, dir, "max_count",
 				&ibs_config.max_cnt_fetch);
 	oprofilefs_create_ulong(sb, dir, "rand_enable",
 				&ibs_config.rand_en);

 	dir = oprofilefs_mkdir(sb, root, "ibs_op");
 	oprofilefs_create_ulong(sb, dir, "enable",
 				&ibs_config.op_enabled);
 	oprofilefs_create_ulong(sb, dir, "max_count",
 				&ibs_config.max_cnt_op);
 	oprofilefs_create_ulong(sb, dir, "dispatched_ops",
 				&ibs_config.dispatched_ops);

 	return 0;
 }

 static int op_amd_init(struct oprofile_operations *ops)
 {
 	setup_ibs();
 	create_arch_files = ops->create_files;
 	ops->create_files = setup_ibs_files;
 	return 0;
 }

 static void op_amd_exit(void)
 {
 	clear_ibs_nmi();
 }

 #endif

 struct op_x86_model_spec const op_amd_spec = {
 	.init			= op_amd_init,
 	.exit			= op_amd_exit,
 	.num_counters		= NUM_COUNTERS,
 	.num_controls		= NUM_CONTROLS,
 	.fill_in_addresses	= &op_amd_fill_in_addresses,
 	.setup_ctrs		= &op_amd_setup_ctrs,
 	.check_ctrs		= &op_amd_check_ctrs,
 	.start			= &op_amd_start,
 	.stop			= &op_amd_stop,
 	.shutdown		= &op_amd_shutdown
 };
	/*
	* @file op_model_amd.c
	* athlon / K7 / K8 / Family 10h model-specific MSR operations
	*
	* @remark Copyright 2002-2008 OProfile authors
	* @remark Read the file COPYING
	*
	* @author John Levon
	* @author Philippe Elie
	* @author Graydon Hoare
	* @author Robert Richter <robert.richter@amd.com>
	* @author Barry Kasindorf
	*/

	#include <linux/oprofile.h>
	#include <linux/device.h>
	#include <linux/pci.h>

	#include <asm/ptrace.h>
	#include <asm/msr.h>
	#include <asm/nmi.h>

	#include "op_x86_model.h"
	#include "op_counter.h"

	#define NUM_COUNTERS 4
	#define NUM_CONTROLS 4

	#define CTR_IS_RESERVED(msrs, c) (msrs->counters[(c)].addr ? 1 : 0)
	#define CTR_READ(l, h, msrs, c) do {rdmsr(msrs->counters[(c)].addr, (l), (h)); } while (0)
	#define CTR_WRITE(l, msrs, c) do {wrmsr(msrs->counters[(c)].addr, -(unsigned int)(l), -1); } while (0)
	#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))

	#define CTRL_IS_RESERVED(msrs, c) (msrs->controls[(c)].addr ? 1 : 0)
	#define CTRL_READ(l, h, msrs, c) do {rdmsr(msrs->controls[(c)].addr, (l), (h)); } while (0)
	#define CTRL_WRITE(l, h, msrs, c) do {wrmsr(msrs->controls[(c)].addr, (l), (h)); } while (0)
	#define CTRL_SET_ACTIVE(n) (n \|= (1<<22))
	#define CTRL_SET_INACTIVE(n) (n &= ~(1<<22))
	#define CTRL_CLEAR_LO(x) (x &= (1<<21))
	#define CTRL_CLEAR_HI(x) (x &= 0xfffffcf0)
	#define CTRL_SET_ENABLE(val) (val \|= 1<<20)
	#define CTRL_SET_USR(val, u) (val \|= ((u & 1) << 16))
	#define CTRL_SET_KERN(val, k) (val \|= ((k & 1) << 17))
	#define CTRL_SET_UM(val, m) (val \|= (m << 8))
	#define CTRL_SET_EVENT_LOW(val, e) (val \|= (e & 0xff))
	#define CTRL_SET_EVENT_HIGH(val, e) (val \|= ((e >> 8) & 0xf))
	#define CTRL_SET_HOST_ONLY(val, h) (val \|= ((h & 1) << 9))
	#define CTRL_SET_GUEST_ONLY(val, h) (val \|= ((h & 1) << 8))

	static unsigned long reset_value[NUM_COUNTERS];

	#ifdef CONFIG_OPROFILE_IBS

	/* IbsFetchCtl bits/masks */
	#define IBS_FETCH_HIGH_VALID_BIT (1UL << 17) /* bit 49 */
	#define IBS_FETCH_HIGH_ENABLE (1UL << 16) /* bit 48 */
	#define IBS_FETCH_LOW_MAX_CNT_MASK 0x0000FFFFUL /* MaxCnt mask */

	/IbsOpCtl bits /
	#define IBS_OP_LOW_VALID_BIT (1ULL<<18) /* bit 18 */
	#define IBS_OP_LOW_ENABLE (1ULL<<17) /* bit 17 */

	/* Codes used in cpu_buffer.c */
	/* This produces duplicate code, need to be fixed */
	#define IBS_FETCH_BEGIN 3
	#define IBS_OP_BEGIN 4

	/* The function interface needs to be fixed, something like add
	data. Should then be added to linux/oprofile.h. */
	extern void
	oprofile_add_ibs_sample(struct pt_regs *const regs,
	unsigned int * const ibs_sample, int ibs_code);

	struct ibs_fetch_sample {
	/* MSRC001_1031 IBS Fetch Linear Address Register */
	unsigned int ibs_fetch_lin_addr_low;
	unsigned int ibs_fetch_lin_addr_high;
	/* MSRC001_1030 IBS Fetch Control Register */
	unsigned int ibs_fetch_ctl_low;
	unsigned int ibs_fetch_ctl_high;
	/* MSRC001_1032 IBS Fetch Physical Address Register */
	unsigned int ibs_fetch_phys_addr_low;
	unsigned int ibs_fetch_phys_addr_high;
	};

	struct ibs_op_sample {
	/* MSRC001_1034 IBS Op Logical Address Register (IbsRIP) */
	unsigned int ibs_op_rip_low;
	unsigned int ibs_op_rip_high;
	/* MSRC001_1035 IBS Op Data Register */
	unsigned int ibs_op_data1_low;
	unsigned int ibs_op_data1_high;
	/* MSRC001_1036 IBS Op Data 2 Register */
	unsigned int ibs_op_data2_low;
	unsigned int ibs_op_data2_high;
	/* MSRC001_1037 IBS Op Data 3 Register */
	unsigned int ibs_op_data3_low;
	unsigned int ibs_op_data3_high;
	/* MSRC001_1038 IBS DC Linear Address Register (IbsDcLinAd) */
	unsigned int ibs_dc_linear_low;
	unsigned int ibs_dc_linear_high;
	/* MSRC001_1039 IBS DC Physical Address Register (IbsDcPhysAd) */
	unsigned int ibs_dc_phys_low;
	unsigned int ibs_dc_phys_high;
	};

	/*
	* unitialize the APIC for the IBS interrupts if needed on AMD Family10h+
	*/
	static void clear_ibs_nmi(void);

	static int ibs_allowed; /* AMD Family10h and later */

	struct op_ibs_config {
	unsigned long op_enabled;
	unsigned long fetch_enabled;
	unsigned long max_cnt_fetch;
	unsigned long max_cnt_op;
	unsigned long rand_en;
	unsigned long dispatched_ops;
	};

	static struct op_ibs_config ibs_config;

	#endif

	/* functions for op_amd_spec */

	static void op_amd_fill_in_addresses(struct op_msrs * const msrs)
	{
	int i;

	for (i = 0; i < NUM_COUNTERS; i++) {
	if (reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
	msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
	else
	msrs->counters[i].addr = 0;
	}

	for (i = 0; i < NUM_CONTROLS; i++) {
	if (reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i))
	msrs->controls[i].addr = MSR_K7_EVNTSEL0 + i;
	else
	msrs->controls[i].addr = 0;
	}
	}


	static void op_amd_setup_ctrs(struct op_msrs const * const msrs)
	{
	unsigned int low, high;
	int i;

	/* clear all counters */
	for (i = 0 ; i < NUM_CONTROLS; ++i) {
	if (unlikely(!CTRL_IS_RESERVED(msrs, i)))
	continue;
	CTRL_READ(low, high, msrs, i);
	CTRL_CLEAR_LO(low);
	CTRL_CLEAR_HI(high);
	CTRL_WRITE(low, high, msrs, i);
	}

	/* avoid a false detection of ctr overflows in NMI handler */
	for (i = 0; i < NUM_COUNTERS; ++i) {
	if (unlikely(!CTR_IS_RESERVED(msrs, i)))
	continue;
	CTR_WRITE(1, msrs, i);
	}

	/* enable active counters */
	for (i = 0; i < NUM_COUNTERS; ++i) {
	if ((counter_config[i].enabled) && (CTR_IS_RESERVED(msrs, i))) {
	reset_value[i] = counter_config[i].count;

	CTR_WRITE(counter_config[i].count, msrs, i);

	CTRL_READ(low, high, msrs, i);
	CTRL_CLEAR_LO(low);
	CTRL_CLEAR_HI(high);
	CTRL_SET_ENABLE(low);
	CTRL_SET_USR(low, counter_config[i].user);
	CTRL_SET_KERN(low, counter_config[i].kernel);
	CTRL_SET_UM(low, counter_config[i].unit_mask);
	CTRL_SET_EVENT_LOW(low, counter_config[i].event);
	CTRL_SET_EVENT_HIGH(high, counter_config[i].event);
	CTRL_SET_HOST_ONLY(high, 0);
	CTRL_SET_GUEST_ONLY(high, 0);

	CTRL_WRITE(low, high, msrs, i);
	} else {
	reset_value[i] = 0;
	}
	}
	}

	#ifdef CONFIG_OPROFILE_IBS

	static inline int
	op_amd_handle_ibs(struct pt_regs * const regs,
	struct op_msrs const * const msrs)
	{
	unsigned int low, high;
	struct ibs_fetch_sample ibs_fetch;
	struct ibs_op_sample ibs_op;

	if (!ibs_allowed)
	return 1;

	if (ibs_config.fetch_enabled) {
	rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
	if (high & IBS_FETCH_HIGH_VALID_BIT) {
	ibs_fetch.ibs_fetch_ctl_high = high;
	ibs_fetch.ibs_fetch_ctl_low = low;
	rdmsr(MSR_AMD64_IBSFETCHLINAD, low, high);
	ibs_fetch.ibs_fetch_lin_addr_high = high;
	ibs_fetch.ibs_fetch_lin_addr_low = low;
	rdmsr(MSR_AMD64_IBSFETCHPHYSAD, low, high);
	ibs_fetch.ibs_fetch_phys_addr_high = high;
	ibs_fetch.ibs_fetch_phys_addr_low = low;

	oprofile_add_ibs_sample(regs,
	(unsigned int *)&ibs_fetch,
	IBS_FETCH_BEGIN);

	/reenable the IRQ /
	rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
	high &= ~IBS_FETCH_HIGH_VALID_BIT;
	high \|= IBS_FETCH_HIGH_ENABLE;
	low &= IBS_FETCH_LOW_MAX_CNT_MASK;
	wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
	}
	}

	if (ibs_config.op_enabled) {
	rdmsr(MSR_AMD64_IBSOPCTL, low, high);
	if (low & IBS_OP_LOW_VALID_BIT) {
	rdmsr(MSR_AMD64_IBSOPRIP, low, high);
	ibs_op.ibs_op_rip_low = low;
	ibs_op.ibs_op_rip_high = high;
	rdmsr(MSR_AMD64_IBSOPDATA, low, high);
	ibs_op.ibs_op_data1_low = low;
	ibs_op.ibs_op_data1_high = high;
	rdmsr(MSR_AMD64_IBSOPDATA2, low, high);
	ibs_op.ibs_op_data2_low = low;
	ibs_op.ibs_op_data2_high = high;
	rdmsr(MSR_AMD64_IBSOPDATA3, low, high);
	ibs_op.ibs_op_data3_low = low;
	ibs_op.ibs_op_data3_high = high;
	rdmsr(MSR_AMD64_IBSDCLINAD, low, high);
	ibs_op.ibs_dc_linear_low = low;
	ibs_op.ibs_dc_linear_high = high;
	rdmsr(MSR_AMD64_IBSDCPHYSAD, low, high);
	ibs_op.ibs_dc_phys_low = low;
	ibs_op.ibs_dc_phys_high = high;

	/* reenable the IRQ */
	oprofile_add_ibs_sample(regs,
	(unsigned int *)&ibs_op,
	IBS_OP_BEGIN);
	rdmsr(MSR_AMD64_IBSOPCTL, low, high);
	high = 0;
	low &= ~IBS_OP_LOW_VALID_BIT;
	low \|= IBS_OP_LOW_ENABLE;
	wrmsr(MSR_AMD64_IBSOPCTL, low, high);
	}
	}

	return 1;
	}

	#endif

	static int op_amd_check_ctrs(struct pt_regs * const regs,
	struct op_msrs const * const msrs)
	{
	unsigned int low, high;
	int i;

	for (i = 0 ; i < NUM_COUNTERS; ++i) {
	if (!reset_value[i])
	continue;
	CTR_READ(low, high, msrs, i);
	if (CTR_OVERFLOWED(low)) {
	oprofile_add_sample(regs, i);
	CTR_WRITE(reset_value[i], msrs, i);
	}
	}

	#ifdef CONFIG_OPROFILE_IBS
	op_amd_handle_ibs(regs, msrs);
	#endif

	/* See op_model_ppro.c */
	return 1;
	}

	static void op_amd_start(struct op_msrs const * const msrs)
	{
	unsigned int low, high;
	int i;
	for (i = 0 ; i < NUM_COUNTERS ; ++i) {
	if (reset_value[i]) {
	CTRL_READ(low, high, msrs, i);
	CTRL_SET_ACTIVE(low);
	CTRL_WRITE(low, high, msrs, i);
	}
	}

	#ifdef CONFIG_OPROFILE_IBS
	if (ibs_allowed && ibs_config.fetch_enabled) {
	low = (ibs_config.max_cnt_fetch >> 4) & 0xFFFF;
	high = IBS_FETCH_HIGH_ENABLE;
	wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
	}

	if (ibs_allowed && ibs_config.op_enabled) {
	low = ((ibs_config.max_cnt_op >> 4) & 0xFFFF) + IBS_OP_LOW_ENABLE;
	high = 0;
	wrmsr(MSR_AMD64_IBSOPCTL, low, high);
	}
	#endif
	}


	static void op_amd_stop(struct op_msrs const * const msrs)
	{
	unsigned int low, high;
	int i;

	/* Subtle: stop on all counters to avoid race with
	* setting our pm callback */
	for (i = 0 ; i < NUM_COUNTERS ; ++i) {
	if (!reset_value[i])
	continue;
	CTRL_READ(low, high, msrs, i);
	CTRL_SET_INACTIVE(low);
	CTRL_WRITE(low, high, msrs, i);
	}

	#ifdef CONFIG_OPROFILE_IBS
	if (ibs_allowed && ibs_config.fetch_enabled) {
	low = 0; /* clear max count and enable */
	high = 0;
	wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
	}

	if (ibs_allowed && ibs_config.op_enabled) {
	low = 0; /* clear max count and enable */
	high = 0;
	wrmsr(MSR_AMD64_IBSOPCTL, low, high);
	}
	#endif
	}

	static void op_amd_shutdown(struct op_msrs const * const msrs)
	{
	int i;

	for (i = 0 ; i < NUM_COUNTERS ; ++i) {
	if (CTR_IS_RESERVED(msrs, i))
	release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
	}
	for (i = 0 ; i < NUM_CONTROLS ; ++i) {
	if (CTRL_IS_RESERVED(msrs, i))
	release_evntsel_nmi(MSR_K7_EVNTSEL0 + i);
	}
	}

	#ifndef CONFIG_OPROFILE_IBS

	/* no IBS support */

	static int op_amd_init(struct oprofile_operations *ops)
	{
	return 0;
	}

	static void op_amd_exit(void) {}

	#else

	static u8 ibs_eilvt_off;

	static inline void apic_init_ibs_nmi_per_cpu(void *arg)
	{
	ibs_eilvt_off = setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_NMI, 0);
	}

	static inline void apic_clear_ibs_nmi_per_cpu(void *arg)
	{
	setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 1);
	}

	static int pfm_amd64_setup_eilvt(void)
	{
	#define IBSCTL_LVTOFFSETVAL (1 << 8)
	#define IBSCTL 0x1cc
	struct pci_dev *cpu_cfg;
	int nodes;
	u32 value = 0;

	/* per CPU setup */
	on_each_cpu(apic_init_ibs_nmi_per_cpu, NULL, 1);

	nodes = 0;
	cpu_cfg = NULL;
	do {
	cpu_cfg = pci_get_device(PCI_VENDOR_ID_AMD,
	PCI_DEVICE_ID_AMD_10H_NB_MISC,
	cpu_cfg);
	if (!cpu_cfg)
	break;
	++nodes;
	pci_write_config_dword(cpu_cfg, IBSCTL, ibs_eilvt_off
	\| IBSCTL_LVTOFFSETVAL);
	pci_read_config_dword(cpu_cfg, IBSCTL, &value);
	if (value != (ibs_eilvt_off \| IBSCTL_LVTOFFSETVAL)) {
	printk(KERN_DEBUG "Failed to setup IBS LVT offset, "
	"IBSCTL = 0x%08x", value);
	return 1;
	}
	} while (1);

	if (!nodes) {
	printk(KERN_DEBUG "No CPU node configured for IBS");
	return 1;
	}

	#ifdef CONFIG_NUMA
	/* Sanity check */
	/* Works only for 64bit with proper numa implementation. */
	if (nodes != num_possible_nodes()) {
	printk(KERN_DEBUG "Failed to setup CPU node(s) for IBS, "
	"found: %d, expected %d",
	nodes, num_possible_nodes());
	return 1;
	}
	#endif
	return 0;
	}

	/*
	* initialize the APIC for the IBS interrupts
	* if available (AMD Family10h rev B0 and later)
	*/
	static void setup_ibs(void)
	{
	ibs_allowed = boot_cpu_has(X86_FEATURE_IBS);

	if (!ibs_allowed)
	return;

	if (pfm_amd64_setup_eilvt()) {
	ibs_allowed = 0;
	return;
	}

	printk(KERN_INFO "oprofile: AMD IBS detected\n");
	}


	/*
	* unitialize the APIC for the IBS interrupts if needed on AMD Family10h
	* rev B0 and later */
	static void clear_ibs_nmi(void)
	{
	if (ibs_allowed)
	on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
	}

	static int (create_arch_files)(struct super_block sb, struct dentry * root);

	static int setup_ibs_files(struct super_block * sb, struct dentry * root)
	{
	struct dentry *dir;
	int ret = 0;

	/* architecture specific files */
	if (create_arch_files)
	ret = create_arch_files(sb, root);

	if (ret)
	return ret;

	if (!ibs_allowed)
	return ret;

	/* model specific files */

	/* setup some reasonable defaults */
	ibs_config.max_cnt_fetch = 250000;
	ibs_config.fetch_enabled = 0;
	ibs_config.max_cnt_op = 250000;
	ibs_config.op_enabled = 0;
	ibs_config.dispatched_ops = 1;

	dir = oprofilefs_mkdir(sb, root, "ibs_fetch");
	oprofilefs_create_ulong(sb, dir, "enable",
	&ibs_config.fetch_enabled);
	oprofilefs_create_ulong(sb, dir, "max_count",
	&ibs_config.max_cnt_fetch);
	oprofilefs_create_ulong(sb, dir, "rand_enable",
	&ibs_config.rand_en);

	dir = oprofilefs_mkdir(sb, root, "ibs_op");
	oprofilefs_create_ulong(sb, dir, "enable",
	&ibs_config.op_enabled);
	oprofilefs_create_ulong(sb, dir, "max_count",
	&ibs_config.max_cnt_op);
	oprofilefs_create_ulong(sb, dir, "dispatched_ops",
	&ibs_config.dispatched_ops);

	return 0;
	}

	static int op_amd_init(struct oprofile_operations *ops)
	{
	setup_ibs();
	create_arch_files = ops->create_files;
	ops->create_files = setup_ibs_files;
	return 0;
	}

	static void op_amd_exit(void)
	{
	clear_ibs_nmi();
	}

	#endif

	struct op_x86_model_spec const op_amd_spec = {
	.init = op_amd_init,
	.exit = op_amd_exit,
	.num_counters = NUM_COUNTERS,
	.num_controls = NUM_CONTROLS,
	.fill_in_addresses = &op_amd_fill_in_addresses,
	.setup_ctrs = &op_amd_setup_ctrs,
	.check_ctrs = &op_amd_check_ctrs,
	.start = &op_amd_start,
	.stop = &op_amd_stop,
	.shutdown = &op_amd_shutdown
	};