/*
 * Netburst Performance Events (P4, old Xeon)
 *
 *  Copyright (C) 2010 Parallels, Inc., Cyrill Gorcunov <gorcunov@openvz.org>
 *  Copyright (C) 2010 Intel Corporation, Lin Ming <ming.m.lin@intel.com>
 *
 *  For licencing details see kernel-base/COPYING
 */

#include <linux/perf_event.h>

#include <asm/perf_event_p4.h>
#include <asm/hardirq.h>
#include <asm/apic.h>

#include "../perf_event.h"

#define P4_CNTR_LIMIT 3
/*
 * array indices: 0,1 - HT threads, used with HT enabled cpu
 */
struct p4_event_bind {
        unsigned int opcode;                    /* Event code and ESCR selector */
        unsigned int escr_msr[2];               /* ESCR MSR for this event */
        unsigned int escr_emask;                /* valid ESCR EventMask bits */
        unsigned int shared;                    /* event is shared across threads */
        char cntr[2][P4_CNTR_LIMIT];            /* counter index (offset), -1 on absence */
};

struct p4_pebs_bind {
        unsigned int metric_pebs;
        unsigned int metric_vert;
};

/* it sets P4_PEBS_ENABLE_UOP_TAG as well */
#define P4_GEN_PEBS_BIND(name, pebs, vert)                      \
        [P4_PEBS_METRIC__##name] = {                            \
                .metric_pebs = pebs | P4_PEBS_ENABLE_UOP_TAG,   \
                .metric_vert = vert,                            \
        }

/*
 * note we have P4_PEBS_ENABLE_UOP_TAG always set here
 *
 * it's needed for mapping P4_PEBS_CONFIG_METRIC_MASK bits of
 * event configuration to find out which values are to be
 * written into MSR_IA32_PEBS_ENABLE and MSR_P4_PEBS_MATRIX_VERT
 * registers
 */
static struct p4_pebs_bind p4_pebs_bind_map[] = {
        P4_GEN_PEBS_BIND(1stl_cache_load_miss_retired,  0x0000001, 0x0000001),
        P4_GEN_PEBS_BIND(2ndl_cache_load_miss_retired,  0x0000002, 0x0000001),
        P4_GEN_PEBS_BIND(dtlb_load_miss_retired,        0x0000004, 0x0000001),
        P4_GEN_PEBS_BIND(dtlb_store_miss_retired,       0x0000004, 0x0000002),
        P4_GEN_PEBS_BIND(dtlb_all_miss_retired,         0x0000004, 0x0000003),
        P4_GEN_PEBS_BIND(tagged_mispred_branch,         0x0018000, 0x0000010),
        P4_GEN_PEBS_BIND(mob_load_replay_retired,       0x0000200, 0x0000001),
        P4_GEN_PEBS_BIND(split_load_retired,            0x0000400, 0x0000001),
        P4_GEN_PEBS_BIND(split_store_retired,           0x0000400, 0x0000002),
};

/*
 * Note that we don't use CCCR1 here, there is an
 * exception for P4_BSQ_ALLOCATION but we just have
 * no workaround
 *
 * consider this binding as resources which particular
 * event may borrow, it doesn't contain EventMask,
 * Tags and friends -- they are left to a caller
 */
static struct p4_event_bind p4_event_bind_map[] = {
        [P4_EVENT_TC_DELIVER_MODE] = {
                .opcode         = P4_OPCODE(P4_EVENT_TC_DELIVER_MODE),
                .escr_msr       = { MSR_P4_TC_ESCR0, MSR_P4_TC_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_DELIVER_MODE, DD)                 |
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_DELIVER_MODE, DB)                 |
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_DELIVER_MODE, DI)                 |
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_DELIVER_MODE, BD)                 |
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_DELIVER_MODE, BB)                 |
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_DELIVER_MODE, BI)                 |
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_DELIVER_MODE, ID),
                .shared         = 1,
                .cntr           = { {4, 5, -1}, {6, 7, -1} },
        },
        [P4_EVENT_BPU_FETCH_REQUEST] = {
                .opcode         = P4_OPCODE(P4_EVENT_BPU_FETCH_REQUEST),
                .escr_msr       = { MSR_P4_BPU_ESCR0, MSR_P4_BPU_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_BPU_FETCH_REQUEST, TCMISS),
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_ITLB_REFERENCE] = {
                .opcode         = P4_OPCODE(P4_EVENT_ITLB_REFERENCE),
                .escr_msr       = { MSR_P4_ITLB_ESCR0, MSR_P4_ITLB_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_ITLB_REFERENCE, HIT)                 |
                        P4_ESCR_EMASK_BIT(P4_EVENT_ITLB_REFERENCE, MISS)                |
                        P4_ESCR_EMASK_BIT(P4_EVENT_ITLB_REFERENCE, HIT_UK),
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_MEMORY_CANCEL] = {
                .opcode         = P4_OPCODE(P4_EVENT_MEMORY_CANCEL),
                .escr_msr       = { MSR_P4_DAC_ESCR0, MSR_P4_DAC_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_MEMORY_CANCEL, ST_RB_FULL)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_MEMORY_CANCEL, 64K_CONF),
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_MEMORY_COMPLETE] = {
                .opcode         = P4_OPCODE(P4_EVENT_MEMORY_COMPLETE),
                .escr_msr       = { MSR_P4_SAAT_ESCR0 , MSR_P4_SAAT_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_MEMORY_COMPLETE, LSC)                |
                        P4_ESCR_EMASK_BIT(P4_EVENT_MEMORY_COMPLETE, SSC),
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_LOAD_PORT_REPLAY] = {
                .opcode         = P4_OPCODE(P4_EVENT_LOAD_PORT_REPLAY),
                .escr_msr       = { MSR_P4_SAAT_ESCR0, MSR_P4_SAAT_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_LOAD_PORT_REPLAY, SPLIT_LD),
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_STORE_PORT_REPLAY] = {
                .opcode         = P4_OPCODE(P4_EVENT_STORE_PORT_REPLAY),
                .escr_msr       = { MSR_P4_SAAT_ESCR0 ,  MSR_P4_SAAT_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_STORE_PORT_REPLAY, SPLIT_ST),
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_MOB_LOAD_REPLAY] = {
                .opcode         = P4_OPCODE(P4_EVENT_MOB_LOAD_REPLAY),
                .escr_msr       = { MSR_P4_MOB_ESCR0, MSR_P4_MOB_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_MOB_LOAD_REPLAY, NO_STA)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_MOB_LOAD_REPLAY, NO_STD)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_MOB_LOAD_REPLAY, PARTIAL_DATA)       |
                        P4_ESCR_EMASK_BIT(P4_EVENT_MOB_LOAD_REPLAY, UNALGN_ADDR),
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_PAGE_WALK_TYPE] = {
                .opcode         = P4_OPCODE(P4_EVENT_PAGE_WALK_TYPE),
                .escr_msr       = { MSR_P4_PMH_ESCR0, MSR_P4_PMH_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_PAGE_WALK_TYPE, DTMISS)              |
                        P4_ESCR_EMASK_BIT(P4_EVENT_PAGE_WALK_TYPE, ITMISS),
                .shared         = 1,
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_BSQ_CACHE_REFERENCE] = {
                .opcode         = P4_OPCODE(P4_EVENT_BSQ_CACHE_REFERENCE),
                .escr_msr       = { MSR_P4_BSU_ESCR0, MSR_P4_BSU_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_2ndL_HITS)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_2ndL_HITE)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_2ndL_HITM)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_3rdL_HITS)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_3rdL_HITE)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_3rdL_HITM)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_2ndL_MISS)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_3rdL_MISS)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, WR_2ndL_MISS),
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_IOQ_ALLOCATION] = {
                .opcode         = P4_OPCODE(P4_EVENT_IOQ_ALLOCATION),
                .escr_msr       = { MSR_P4_FSB_ESCR0, MSR_P4_FSB_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, DEFAULT)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, ALL_READ)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, ALL_WRITE)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, MEM_UC)              |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, MEM_WC)              |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, MEM_WT)              |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, MEM_WP)              |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, MEM_WB)              |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, OWN)                 |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, OTHER)               |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ALLOCATION, PREFETCH),
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_IOQ_ACTIVE_ENTRIES] = {       /* shared ESCR */
                .opcode         = P4_OPCODE(P4_EVENT_IOQ_ACTIVE_ENTRIES),
                .escr_msr       = { MSR_P4_FSB_ESCR1,  MSR_P4_FSB_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, DEFAULT)         |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, ALL_READ)        |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, ALL_WRITE)       |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, MEM_UC)          |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, MEM_WC)          |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, MEM_WT)          |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, MEM_WP)          |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, MEM_WB)          |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, OWN)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, OTHER)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_IOQ_ACTIVE_ENTRIES, PREFETCH),
                .cntr           = { {2, -1, -1}, {3, -1, -1} },
        },
        [P4_EVENT_FSB_DATA_ACTIVITY] = {
                .opcode         = P4_OPCODE(P4_EVENT_FSB_DATA_ACTIVITY),
                .escr_msr       = { MSR_P4_FSB_ESCR0, MSR_P4_FSB_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_FSB_DATA_ACTIVITY, DRDY_DRV)         |
                        P4_ESCR_EMASK_BIT(P4_EVENT_FSB_DATA_ACTIVITY, DRDY_OWN)         |
                        P4_ESCR_EMASK_BIT(P4_EVENT_FSB_DATA_ACTIVITY, DRDY_OTHER)       |
                        P4_ESCR_EMASK_BIT(P4_EVENT_FSB_DATA_ACTIVITY, DBSY_DRV)         |
                        P4_ESCR_EMASK_BIT(P4_EVENT_FSB_DATA_ACTIVITY, DBSY_OWN)         |
                        P4_ESCR_EMASK_BIT(P4_EVENT_FSB_DATA_ACTIVITY, DBSY_OTHER),
                .shared         = 1,
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_BSQ_ALLOCATION] = {           /* shared ESCR, broken CCCR1 */
                .opcode         = P4_OPCODE(P4_EVENT_BSQ_ALLOCATION),
                .escr_msr       = { MSR_P4_BSU_ESCR0, MSR_P4_BSU_ESCR0 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_TYPE0)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_TYPE1)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_LEN0)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_LEN1)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_IO_TYPE)         |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_LOCK_TYPE)       |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_CACHE_TYPE)      |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_SPLIT_TYPE)      |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_DEM_TYPE)        |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, REQ_ORD_TYPE)        |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, MEM_TYPE0)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, MEM_TYPE1)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ALLOCATION, MEM_TYPE2),
                .cntr           = { {0, -1, -1}, {1, -1, -1} },
        },
        [P4_EVENT_BSQ_ACTIVE_ENTRIES] = {       /* shared ESCR */
                .opcode         = P4_OPCODE(P4_EVENT_BSQ_ACTIVE_ENTRIES),
                .escr_msr       = { MSR_P4_BSU_ESCR1 , MSR_P4_BSU_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_TYPE0)       |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_TYPE1)       |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_LEN0)        |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_LEN1)        |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_IO_TYPE)     |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_LOCK_TYPE)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_CACHE_TYPE)  |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_SPLIT_TYPE)  |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_DEM_TYPE)    |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, REQ_ORD_TYPE)    |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, MEM_TYPE0)       |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, MEM_TYPE1)       |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_ACTIVE_ENTRIES, MEM_TYPE2),
                .cntr           = { {2, -1, -1}, {3, -1, -1} },
        },
        [P4_EVENT_SSE_INPUT_ASSIST] = {
                .opcode         = P4_OPCODE(P4_EVENT_SSE_INPUT_ASSIST),
                .escr_msr       = { MSR_P4_FIRM_ESCR0, MSR_P4_FIRM_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_SSE_INPUT_ASSIST, ALL),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_PACKED_SP_UOP] = {
                .opcode         = P4_OPCODE(P4_EVENT_PACKED_SP_UOP),
                .escr_msr       = { MSR_P4_FIRM_ESCR0, MSR_P4_FIRM_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_PACKED_SP_UOP, ALL),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_PACKED_DP_UOP] = {
                .opcode         = P4_OPCODE(P4_EVENT_PACKED_DP_UOP),
                .escr_msr       = { MSR_P4_FIRM_ESCR0, MSR_P4_FIRM_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_PACKED_DP_UOP, ALL),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_SCALAR_SP_UOP] = {
                .opcode         = P4_OPCODE(P4_EVENT_SCALAR_SP_UOP),
                .escr_msr       = { MSR_P4_FIRM_ESCR0, MSR_P4_FIRM_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_SCALAR_SP_UOP, ALL),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_SCALAR_DP_UOP] = {
                .opcode         = P4_OPCODE(P4_EVENT_SCALAR_DP_UOP),
                .escr_msr       = { MSR_P4_FIRM_ESCR0, MSR_P4_FIRM_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_SCALAR_DP_UOP, ALL),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_64BIT_MMX_UOP] = {
                .opcode         = P4_OPCODE(P4_EVENT_64BIT_MMX_UOP),
                .escr_msr       = { MSR_P4_FIRM_ESCR0, MSR_P4_FIRM_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_64BIT_MMX_UOP, ALL),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_128BIT_MMX_UOP] = {
                .opcode         = P4_OPCODE(P4_EVENT_128BIT_MMX_UOP),
                .escr_msr       = { MSR_P4_FIRM_ESCR0, MSR_P4_FIRM_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_128BIT_MMX_UOP, ALL),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_X87_FP_UOP] = {
                .opcode         = P4_OPCODE(P4_EVENT_X87_FP_UOP),
                .escr_msr       = { MSR_P4_FIRM_ESCR0, MSR_P4_FIRM_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_X87_FP_UOP, ALL),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_TC_MISC] = {
                .opcode         = P4_OPCODE(P4_EVENT_TC_MISC),
                .escr_msr       = { MSR_P4_TC_ESCR0, MSR_P4_TC_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_MISC, FLUSH),
                .cntr           = { {4, 5, -1}, {6, 7, -1} },
        },
        [P4_EVENT_GLOBAL_POWER_EVENTS] = {
                .opcode         = P4_OPCODE(P4_EVENT_GLOBAL_POWER_EVENTS),
                .escr_msr       = { MSR_P4_FSB_ESCR0, MSR_P4_FSB_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_GLOBAL_POWER_EVENTS, RUNNING),
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_TC_MS_XFER] = {
                .opcode         = P4_OPCODE(P4_EVENT_TC_MS_XFER),
                .escr_msr       = { MSR_P4_MS_ESCR0, MSR_P4_MS_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_TC_MS_XFER, CISC),
                .cntr           = { {4, 5, -1}, {6, 7, -1} },
        },
        [P4_EVENT_UOP_QUEUE_WRITES] = {
                .opcode         = P4_OPCODE(P4_EVENT_UOP_QUEUE_WRITES),
                .escr_msr       = { MSR_P4_MS_ESCR0, MSR_P4_MS_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_UOP_QUEUE_WRITES, FROM_TC_BUILD)     |
                        P4_ESCR_EMASK_BIT(P4_EVENT_UOP_QUEUE_WRITES, FROM_TC_DELIVER)   |
                        P4_ESCR_EMASK_BIT(P4_EVENT_UOP_QUEUE_WRITES, FROM_ROM),
                .cntr           = { {4, 5, -1}, {6, 7, -1} },
        },
        [P4_EVENT_RETIRED_MISPRED_BRANCH_TYPE] = {
                .opcode         = P4_OPCODE(P4_EVENT_RETIRED_MISPRED_BRANCH_TYPE),
                .escr_msr       = { MSR_P4_TBPU_ESCR0 , MSR_P4_TBPU_ESCR0 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_MISPRED_BRANCH_TYPE, CONDITIONAL)    |
                        P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_MISPRED_BRANCH_TYPE, CALL)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_MISPRED_BRANCH_TYPE, RETURN)         |
                        P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_MISPRED_BRANCH_TYPE, INDIRECT),
                .cntr           = { {4, 5, -1}, {6, 7, -1} },
        },
        [P4_EVENT_RETIRED_BRANCH_TYPE] = {
                .opcode         = P4_OPCODE(P4_EVENT_RETIRED_BRANCH_TYPE),
                .escr_msr       = { MSR_P4_TBPU_ESCR0 , MSR_P4_TBPU_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_BRANCH_TYPE, CONDITIONAL)    |
                        P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_BRANCH_TYPE, CALL)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_BRANCH_TYPE, RETURN)         |
                        P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_BRANCH_TYPE, INDIRECT),
                .cntr           = { {4, 5, -1}, {6, 7, -1} },
        },
        [P4_EVENT_RESOURCE_STALL] = {
                .opcode         = P4_OPCODE(P4_EVENT_RESOURCE_STALL),
                .escr_msr       = { MSR_P4_ALF_ESCR0, MSR_P4_ALF_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_RESOURCE_STALL, SBFULL),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_WC_BUFFER] = {
                .opcode         = P4_OPCODE(P4_EVENT_WC_BUFFER),
                .escr_msr       = { MSR_P4_DAC_ESCR0, MSR_P4_DAC_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_WC_BUFFER, WCB_EVICTS)               |
                        P4_ESCR_EMASK_BIT(P4_EVENT_WC_BUFFER, WCB_FULL_EVICTS),
                .shared         = 1,
                .cntr           = { {8, 9, -1}, {10, 11, -1} },
        },
        [P4_EVENT_B2B_CYCLES] = {
                .opcode         = P4_OPCODE(P4_EVENT_B2B_CYCLES),
                .escr_msr       = { MSR_P4_FSB_ESCR0, MSR_P4_FSB_ESCR1 },
                .escr_emask     = 0,
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_BNR] = {
                .opcode         = P4_OPCODE(P4_EVENT_BNR),
                .escr_msr       = { MSR_P4_FSB_ESCR0, MSR_P4_FSB_ESCR1 },
                .escr_emask     = 0,
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_SNOOP] = {
                .opcode         = P4_OPCODE(P4_EVENT_SNOOP),
                .escr_msr       = { MSR_P4_FSB_ESCR0, MSR_P4_FSB_ESCR1 },
                .escr_emask     = 0,
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_RESPONSE] = {
                .opcode         = P4_OPCODE(P4_EVENT_RESPONSE),
                .escr_msr       = { MSR_P4_FSB_ESCR0, MSR_P4_FSB_ESCR1 },
                .escr_emask     = 0,
                .cntr           = { {0, -1, -1}, {2, -1, -1} },
        },
        [P4_EVENT_FRONT_END_EVENT] = {
                .opcode         = P4_OPCODE(P4_EVENT_FRONT_END_EVENT),
                .escr_msr       = { MSR_P4_CRU_ESCR2, MSR_P4_CRU_ESCR3 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_FRONT_END_EVENT, NBOGUS)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_FRONT_END_EVENT, BOGUS),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_EXECUTION_EVENT] = {
                .opcode         = P4_OPCODE(P4_EVENT_EXECUTION_EVENT),
                .escr_msr       = { MSR_P4_CRU_ESCR2, MSR_P4_CRU_ESCR3 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, NBOGUS0)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, NBOGUS1)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, NBOGUS2)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, NBOGUS3)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, BOGUS0)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, BOGUS1)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, BOGUS2)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, BOGUS3),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_REPLAY_EVENT] = {
                .opcode         = P4_OPCODE(P4_EVENT_REPLAY_EVENT),
                .escr_msr       = { MSR_P4_CRU_ESCR2, MSR_P4_CRU_ESCR3 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_REPLAY_EVENT, NBOGUS)                |
                        P4_ESCR_EMASK_BIT(P4_EVENT_REPLAY_EVENT, BOGUS),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_INSTR_RETIRED] = {
                .opcode         = P4_OPCODE(P4_EVENT_INSTR_RETIRED),
                .escr_msr       = { MSR_P4_CRU_ESCR0, MSR_P4_CRU_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_INSTR_RETIRED, NBOGUSNTAG)           |
                        P4_ESCR_EMASK_BIT(P4_EVENT_INSTR_RETIRED, NBOGUSTAG)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_INSTR_RETIRED, BOGUSNTAG)            |
                        P4_ESCR_EMASK_BIT(P4_EVENT_INSTR_RETIRED, BOGUSTAG),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_UOPS_RETIRED] = {
                .opcode         = P4_OPCODE(P4_EVENT_UOPS_RETIRED),
                .escr_msr       = { MSR_P4_CRU_ESCR0, MSR_P4_CRU_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_UOPS_RETIRED, NBOGUS)                |
                        P4_ESCR_EMASK_BIT(P4_EVENT_UOPS_RETIRED, BOGUS),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_UOP_TYPE] = {
                .opcode         = P4_OPCODE(P4_EVENT_UOP_TYPE),
                .escr_msr       = { MSR_P4_RAT_ESCR0, MSR_P4_RAT_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_UOP_TYPE, TAGLOADS)                  |
                        P4_ESCR_EMASK_BIT(P4_EVENT_UOP_TYPE, TAGSTORES),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_BRANCH_RETIRED] = {
                .opcode         = P4_OPCODE(P4_EVENT_BRANCH_RETIRED),
                .escr_msr       = { MSR_P4_CRU_ESCR2, MSR_P4_CRU_ESCR3 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_BRANCH_RETIRED, MMNP)                |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BRANCH_RETIRED, MMNM)                |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BRANCH_RETIRED, MMTP)                |
                        P4_ESCR_EMASK_BIT(P4_EVENT_BRANCH_RETIRED, MMTM),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_MISPRED_BRANCH_RETIRED] = {
                .opcode         = P4_OPCODE(P4_EVENT_MISPRED_BRANCH_RETIRED),
                .escr_msr       = { MSR_P4_CRU_ESCR0, MSR_P4_CRU_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_MISPRED_BRANCH_RETIRED, NBOGUS),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_X87_ASSIST] = {
                .opcode         = P4_OPCODE(P4_EVENT_X87_ASSIST),
                .escr_msr       = { MSR_P4_CRU_ESCR2, MSR_P4_CRU_ESCR3 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_X87_ASSIST, FPSU)                    |
                        P4_ESCR_EMASK_BIT(P4_EVENT_X87_ASSIST, FPSO)                    |
                        P4_ESCR_EMASK_BIT(P4_EVENT_X87_ASSIST, POAO)                    |
                        P4_ESCR_EMASK_BIT(P4_EVENT_X87_ASSIST, POAU)                    |
                        P4_ESCR_EMASK_BIT(P4_EVENT_X87_ASSIST, PREA),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_MACHINE_CLEAR] = {
                .opcode         = P4_OPCODE(P4_EVENT_MACHINE_CLEAR),
                .escr_msr       = { MSR_P4_CRU_ESCR2, MSR_P4_CRU_ESCR3 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_MACHINE_CLEAR, CLEAR)                |
                        P4_ESCR_EMASK_BIT(P4_EVENT_MACHINE_CLEAR, MOCLEAR)              |
                        P4_ESCR_EMASK_BIT(P4_EVENT_MACHINE_CLEAR, SMCLEAR),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
        [P4_EVENT_INSTR_COMPLETED] = {
                .opcode         = P4_OPCODE(P4_EVENT_INSTR_COMPLETED),
                .escr_msr       = { MSR_P4_CRU_ESCR0, MSR_P4_CRU_ESCR1 },
                .escr_emask     =
                        P4_ESCR_EMASK_BIT(P4_EVENT_INSTR_COMPLETED, NBOGUS)             |
                        P4_ESCR_EMASK_BIT(P4_EVENT_INSTR_COMPLETED, BOGUS),
                .cntr           = { {12, 13, 16}, {14, 15, 17} },
        },
};

#define P4_GEN_CACHE_EVENT(event, bit, metric)                            \
        p4_config_pack_escr(P4_ESCR_EVENT(event)                        | \
                            P4_ESCR_EMASK_BIT(event, bit))              | \
        p4_config_pack_cccr(metric                                      | \
                            P4_CCCR_ESEL(P4_OPCODE_ESEL(P4_OPCODE(event))))

static __initconst const u64 p4_hw_cache_event_ids
                                [PERF_COUNT_HW_CACHE_MAX]
                                [PERF_COUNT_HW_CACHE_OP_MAX]
                                [PERF_COUNT_HW_CACHE_RESULT_MAX] =
{
 [ C(L1D ) ] = {
        [ C(OP_READ) ] = {
                [ C(RESULT_ACCESS) ] = 0x0,
                [ C(RESULT_MISS)   ] = P4_GEN_CACHE_EVENT(P4_EVENT_REPLAY_EVENT, NBOGUS,
                                                P4_PEBS_METRIC__1stl_cache_load_miss_retired),
        },
 },
 [ C(LL  ) ] = {
        [ C(OP_READ) ] = {
                [ C(RESULT_ACCESS) ] = 0x0,
                [ C(RESULT_MISS)   ] = P4_GEN_CACHE_EVENT(P4_EVENT_REPLAY_EVENT, NBOGUS,
                                                P4_PEBS_METRIC__2ndl_cache_load_miss_retired),
        },
},
 [ C(DTLB) ] = {
        [ C(OP_READ) ] = {
                [ C(RESULT_ACCESS) ] = 0x0,
                [ C(RESULT_MISS)   ] = P4_GEN_CACHE_EVENT(P4_EVENT_REPLAY_EVENT, NBOGUS,
                                                P4_PEBS_METRIC__dtlb_load_miss_retired),
        },
        [ C(OP_WRITE) ] = {
                [ C(RESULT_ACCESS) ] = 0x0,
                [ C(RESULT_MISS)   ] = P4_GEN_CACHE_EVENT(P4_EVENT_REPLAY_EVENT, NBOGUS,
                                                P4_PEBS_METRIC__dtlb_store_miss_retired),
        },
 },
 [ C(ITLB) ] = {
        [ C(OP_READ) ] = {
                [ C(RESULT_ACCESS) ] = P4_GEN_CACHE_EVENT(P4_EVENT_ITLB_REFERENCE, HIT,
                                                P4_PEBS_METRIC__none),
                [ C(RESULT_MISS)   ] = P4_GEN_CACHE_EVENT(P4_EVENT_ITLB_REFERENCE, MISS,
                                                P4_PEBS_METRIC__none),
        },
        [ C(OP_WRITE) ] = {
                [ C(RESULT_ACCESS) ] = -1,
                [ C(RESULT_MISS)   ] = -1,
        },
        [ C(OP_PREFETCH) ] = {
                [ C(RESULT_ACCESS) ] = -1,
                [ C(RESULT_MISS)   ] = -1,
        },
 },
 [ C(NODE) ] = {
        [ C(OP_READ) ] = {
                [ C(RESULT_ACCESS) ] = -1,
                [ C(RESULT_MISS)   ] = -1,
        },
        [ C(OP_WRITE) ] = {
                [ C(RESULT_ACCESS) ] = -1,
                [ C(RESULT_MISS)   ] = -1,
        },
        [ C(OP_PREFETCH) ] = {
                [ C(RESULT_ACCESS) ] = -1,
                [ C(RESULT_MISS)   ] = -1,
        },
 },
};

/*
 * Because of Netburst being quite restricted in how many
 * identical events may run simultaneously, we introduce event aliases,
 * ie the different events which have the same functionality but
 * utilize non-intersected resources (ESCR/CCCR/counter registers).
 *
 * This allow us to relax restrictions a bit and run two or more
 * identical events together.
 *
 * Never set any custom internal bits such as P4_CONFIG_HT,
 * P4_CONFIG_ALIASABLE or bits for P4_PEBS_METRIC, they are
 * either up to date automatically or not applicable at all.
 */
static struct p4_event_alias {
        u64 original;
        u64 alternative;
} p4_event_aliases[] = {
        {
                /*
                 * Non-halted cycles can be substituted with non-sleeping cycles (see
                 * Intel SDM Vol3b for details). We need this alias to be able
                 * to run nmi-watchdog and 'perf top' (or any other user space tool
                 * which is interested in running PERF_COUNT_HW_CPU_CYCLES)
                 * simultaneously.
                 */
        .original       =
                p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_GLOBAL_POWER_EVENTS)         |
                                    P4_ESCR_EMASK_BIT(P4_EVENT_GLOBAL_POWER_EVENTS, RUNNING)),
        .alternative    =
                p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_EXECUTION_EVENT)             |
                                    P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, NBOGUS0)|
                                    P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, NBOGUS1)|
                                    P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, NBOGUS2)|
                                    P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, NBOGUS3)|
                                    P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, BOGUS0) |
                                    P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, BOGUS1) |
                                    P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, BOGUS2) |
                                    P4_ESCR_EMASK_BIT(P4_EVENT_EXECUTION_EVENT, BOGUS3))|
                p4_config_pack_cccr(P4_CCCR_THRESHOLD(15) | P4_CCCR_COMPLEMENT          |
                                    P4_CCCR_COMPARE),
        },
};

static u64 p4_get_alias_event(u64 config)
{
        u64 config_match;
        int i;

        /*
         * Only event with special mark is allowed,
         * we're to be sure it didn't come as malformed
         * RAW event.
         */
        if (!(config & P4_CONFIG_ALIASABLE))
                return 0;

        config_match = config & P4_CONFIG_EVENT_ALIAS_MASK;

        for (i = 0; i < ARRAY_SIZE(p4_event_aliases); i++) {
                if (config_match == p4_event_aliases[i].original) {
                        config_match = p4_event_aliases[i].alternative;
                        break;
                } else if (config_match == p4_event_aliases[i].alternative) {
                        config_match = p4_event_aliases[i].original;
                        break;
                }
        }

        if (i >= ARRAY_SIZE(p4_event_aliases))
                return 0;

        return config_match | (config & P4_CONFIG_EVENT_ALIAS_IMMUTABLE_BITS);
}

static u64 p4_general_events[PERF_COUNT_HW_MAX] = {
  /* non-halted CPU clocks */
  [PERF_COUNT_HW_CPU_CYCLES] =
        p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_GLOBAL_POWER_EVENTS)         |
                P4_ESCR_EMASK_BIT(P4_EVENT_GLOBAL_POWER_EVENTS, RUNNING))       |
                P4_CONFIG_ALIASABLE,

  /*
   * retired instructions
   * in a sake of simplicity we don't use the FSB tagging
   */
  [PERF_COUNT_HW_INSTRUCTIONS] =
        p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_INSTR_RETIRED)               |
                P4_ESCR_EMASK_BIT(P4_EVENT_INSTR_RETIRED, NBOGUSNTAG)           |
                P4_ESCR_EMASK_BIT(P4_EVENT_INSTR_RETIRED, BOGUSNTAG)),

  /* cache hits */
  [PERF_COUNT_HW_CACHE_REFERENCES] =
        p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_BSQ_CACHE_REFERENCE)         |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_2ndL_HITS)   |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_2ndL_HITE)   |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_2ndL_HITM)   |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_3rdL_HITS)   |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_3rdL_HITE)   |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_3rdL_HITM)),

  /* cache misses */
  [PERF_COUNT_HW_CACHE_MISSES] =
        p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_BSQ_CACHE_REFERENCE)         |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_2ndL_MISS)   |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, RD_3rdL_MISS)   |
                P4_ESCR_EMASK_BIT(P4_EVENT_BSQ_CACHE_REFERENCE, WR_2ndL_MISS)),

  /* branch instructions retired */
  [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =
        p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_RETIRED_BRANCH_TYPE)         |
                P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_BRANCH_TYPE, CONDITIONAL)    |
                P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_BRANCH_TYPE, CALL)           |
                P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_BRANCH_TYPE, RETURN)         |
                P4_ESCR_EMASK_BIT(P4_EVENT_RETIRED_BRANCH_TYPE, INDIRECT)),

  /* mispredicted branches retired */
  [PERF_COUNT_HW_BRANCH_MISSES] =
        p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_MISPRED_BRANCH_RETIRED)      |
                P4_ESCR_EMASK_BIT(P4_EVENT_MISPRED_BRANCH_RETIRED, NBOGUS)),

  /* bus ready clocks (cpu is driving #DRDY_DRV\#DRDY_OWN):  */
  [PERF_COUNT_HW_BUS_CYCLES] =
        p4_config_pack_escr(P4_ESCR_EVENT(P4_EVENT_FSB_DATA_ACTIVITY)           |
                P4_ESCR_EMASK_BIT(P4_EVENT_FSB_DATA_ACTIVITY, DRDY_DRV)         |
                P4_ESCR_EMASK_BIT(P4_EVENT_FSB_DATA_ACTIVITY, DRDY_OWN))        |
        p4_config_pack_cccr(P4_CCCR_EDGE | P4_CCCR_COMPARE),
};

static struct p4_event_bind *p4_config_get_bind(u64 config)
{
        unsigned int evnt = p4_config_unpack_event(config);
        struct p4_event_bind *bind = NULL;

        if (evnt < ARRAY_SIZE(p4_event_bind_map))
                bind = &p4_event_bind_map[evnt];

        return bind;
}

static u64 p4_pmu_event_map(int hw_event)
{
        struct p4_event_bind *bind;
        unsigned int esel;
        u64 config;

        config = p4_general_events[hw_event];
        bind = p4_config_get_bind(config);
        esel = P4_OPCODE_ESEL(bind->opcode);
        config |= p4_config_pack_cccr(P4_CCCR_ESEL(esel));

        return config;
}

/* check cpu model specifics */
static bool p4_event_match_cpu_model(unsigned int event_idx)
{
        /* INSTR_COMPLETED event only exist for model 3, 4, 6 (Prescott) */
        if (event_idx == P4_EVENT_INSTR_COMPLETED) {
                if (boot_cpu_data.x86_model != 3 &&
                        boot_cpu_data.x86_model != 4 &&
                        boot_cpu_data.x86_model != 6)
                        return false;
        }

        /*
         * For info
         * - IQ_ESCR0, IQ_ESCR1 only for models 1 and 2
         */

        return true;
}

static int p4_validate_raw_event(struct perf_event *event)
{
        unsigned int v, emask;

        /* User data may have out-of-bound event index */
        v = p4_config_unpack_event(event->attr.config);
        if (v >= ARRAY_SIZE(p4_event_bind_map))
                return -EINVAL;

        /* It may be unsupported: */
        if (!p4_event_match_cpu_model(v))
                return -EINVAL;

        /*
         * NOTE: P4_CCCR_THREAD_ANY has not the same meaning as
         * in Architectural Performance Monitoring, it means not
         * on _which_ logical cpu to count but rather _when_, ie it
         * depends on logical cpu state -- count event if one cpu active,
         * none, both or any, so we just allow user to pass any value
         * desired.
         *
         * In turn we always set Tx_OS/Tx_USR bits bound to logical
         * cpu without their propagation to another cpu
         */

        /*
         * if an event is shared across the logical threads
         * the user needs special permissions to be able to use it
         */
        if (p4_ht_active() && p4_event_bind_map[v].shared) {
                v = perf_allow_cpu(&event->attr);
                if (v)
                        return v;
        }

        /* ESCR EventMask bits may be invalid */
        emask = p4_config_unpack_escr(event->attr.config) & P4_ESCR_EVENTMASK_MASK;
        if (emask & ~p4_event_bind_map[v].escr_emask)
                return -EINVAL;

        /*
         * it may have some invalid PEBS bits
         */
        if (p4_config_pebs_has(event->attr.config, P4_PEBS_CONFIG_ENABLE))
                return -EINVAL;

        v = p4_config_unpack_metric(event->attr.config);
        if (v >= ARRAY_SIZE(p4_pebs_bind_map))
                return -EINVAL;

        return 0;
}

static int p4_hw_config(struct perf_event *event)
{
        int cpu = get_cpu();
        int rc = 0;
        u32 escr, cccr;

        /*
         * the reason we use cpu that early is that: if we get scheduled
         * first time on the same cpu -- we will not need swap thread
         * specific flags in config (and will save some cpu cycles)
         */

        cccr = p4_default_cccr_conf(cpu);
        escr = p4_default_escr_conf(cpu, event->attr.exclude_kernel,
                                         event->attr.exclude_user);
        event->hw.config = p4_config_pack_escr(escr) |
                           p4_config_pack_cccr(cccr);

        if (p4_ht_active() && p4_ht_thread(cpu))
                event->hw.config = p4_set_ht_bit(event->hw.config);

        if (event->attr.type == PERF_TYPE_RAW) {
                struct p4_event_bind *bind;
                unsigned int esel;
                /*
                 * Clear bits we reserve to be managed by kernel itself
                 * and never allowed from a user space
                 */
                event->attr.config &= P4_CONFIG_MASK;

                rc = p4_validate_raw_event(event);
                if (rc)
                        goto out;

                /*
                 * Note that for RAW events we allow user to use P4_CCCR_RESERVED
                 * bits since we keep additional info here (for cache events and etc)
                 */
                event->hw.config |= event->attr.config;
                bind = p4_config_get_bind(event->attr.config);
                if (!bind) {
                        rc = -EINVAL;
                        goto out;
                }
                esel = P4_OPCODE_ESEL(bind->opcode);
                event->hw.config |= p4_config_pack_cccr(P4_CCCR_ESEL(esel));
        }

        rc = x86_setup_perfctr(event);
out:
        put_cpu();
        return rc;
}

static inline int p4_pmu_clear_cccr_ovf(struct hw_perf_event *hwc)
{
        u64 v;

        /* an official way for overflow indication */
        rdmsrl(hwc->config_base, v);
        if (v & P4_CCCR_OVF) {
                wrmsrl(hwc->config_base, v & ~P4_CCCR_OVF);
                return 1;
        }

        /*
         * In some circumstances the overflow might issue an NMI but did
         * not set P4_CCCR_OVF bit. Because a counter holds a negative value
         * we simply check for high bit being set, if it's cleared it means
         * the counter has reached zero value and continued counting before
         * real NMI signal was received:
         */
        rdmsrl(hwc->event_base, v);
        if (!(v & ARCH_P4_UNFLAGGED_BIT))
                return 1;

        return 0;
}

static void p4_pmu_disable_pebs(void)
{
        /*
         * FIXME
         *
         * It's still allowed that two threads setup same cache
         * events so we can't simply clear metrics until we knew
         * no one is depending on us, so we need kind of counter
         * for "ReplayEvent" users.
         *
         * What is more complex -- RAW events, if user (for some
         * reason) will pass some cache event metric with improper
         * event opcode -- it's fine from hardware point of view
         * but completely nonsense from "meaning" of such action.
         *
         * So at moment let leave metrics turned on forever -- it's
         * ok for now but need to be revisited!
         *
         * (void)wrmsrl_safe(MSR_IA32_PEBS_ENABLE, 0);
         * (void)wrmsrl_safe(MSR_P4_PEBS_MATRIX_VERT, 0);
         */
}

static inline void p4_pmu_disable_event(struct perf_event *event)
{
        struct hw_perf_event *hwc = &event->hw;

        /*
         * If event gets disabled while counter is in overflowed
         * state we need to clear P4_CCCR_OVF, otherwise interrupt get
         * asserted again and again
         */
        (void)wrmsrl_safe(hwc->config_base,
                p4_config_unpack_cccr(hwc->config) & ~P4_CCCR_ENABLE & ~P4_CCCR_OVF & ~P4_CCCR_RESERVED);
}

static void p4_pmu_disable_all(void)
{
        struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
        int idx;

        for (idx = 0; idx < x86_pmu.num_counters; idx++) {
                struct perf_event *event = cpuc->events[idx];
                if (!test_bit(idx, cpuc->active_mask))
                        continue;
                p4_pmu_disable_event(event);
        }

        p4_pmu_disable_pebs();
}

/* configuration must be valid */
static void p4_pmu_enable_pebs(u64 config)
{
        struct p4_pebs_bind *bind;
        unsigned int idx;

        BUILD_BUG_ON(P4_PEBS_METRIC__max > P4_PEBS_CONFIG_METRIC_MASK);

        idx = p4_config_unpack_metric(config);
        if (idx == P4_PEBS_METRIC__none)
                return;

        bind = &p4_pebs_bind_map[idx];

        (void)wrmsrl_safe(MSR_IA32_PEBS_ENABLE, (u64)bind->metric_pebs);
        (void)wrmsrl_safe(MSR_P4_PEBS_MATRIX_VERT,      (u64)bind->metric_vert);
}

static void __p4_pmu_enable_event(struct perf_event *event)
{
        struct hw_perf_event *hwc = &event->hw;
        int thread = p4_ht_config_thread(hwc->config);
        u64 escr_conf = p4_config_unpack_escr(p4_clear_ht_bit(hwc->config));
        unsigned int idx = p4_config_unpack_event(hwc->config);
        struct p4_event_bind *bind;
        u64 escr_addr, cccr;

        bind = &p4_event_bind_map[idx];
        escr_addr = bind->escr_msr[thread];

        /*
         * - we dont support cascaded counters yet
         * - and counter 1 is broken (erratum)
         */
        WARN_ON_ONCE(p4_is_event_cascaded(hwc->config));
        WARN_ON_ONCE(hwc->idx == 1);

        /* we need a real Event value */
        escr_conf &= ~P4_ESCR_EVENT_MASK;
        escr_conf |= P4_ESCR_EVENT(P4_OPCODE_EVNT(bind->opcode));

        cccr = p4_config_unpack_cccr(hwc->config);

        /*
         * it could be Cache event so we need to write metrics
         * into additional MSRs
         */
        p4_pmu_enable_pebs(hwc->config);

        (void)wrmsrl_safe(escr_addr, escr_conf);
        (void)wrmsrl_safe(hwc->config_base,
                                (cccr & ~P4_CCCR_RESERVED) | P4_CCCR_ENABLE);
}

static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(X86_PMC_IDX_MAX)], p4_running);

static void p4_pmu_enable_event(struct perf_event *event)
{
        int idx = event->hw.idx;

        __set_bit(idx, per_cpu(p4_running, smp_processor_id()));
        __p4_pmu_enable_event(event);
}

static void p4_pmu_enable_all(int added)
{
        struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
        int idx;

        for (idx = 0; idx < x86_pmu.num_counters; idx++) {
                struct perf_event *event = cpuc->events[idx];
                if (!test_bit(idx, cpuc->active_mask))
                        continue;
                __p4_pmu_enable_event(event);
        }
}

static int p4_pmu_handle_irq(struct pt_regs *regs)
{
        struct perf_sample_data data;
        struct cpu_hw_events *cpuc;
        struct perf_event *event;
        struct hw_perf_event *hwc;
        int idx, handled = 0;
        u64 val;

        cpuc = this_cpu_ptr(&cpu_hw_events);

        for (idx = 0; idx < x86_pmu.num_counters; idx++) {
                int overflow;

                if (!test_bit(idx, cpuc->active_mask)) {
                        /* catch in-flight IRQs */
                        if (__test_and_clear_bit(idx, per_cpu(p4_running, smp_processor_id())))
                                handled++;
                        continue;
                }

                event = cpuc->events[idx];
                hwc = &event->hw;

                WARN_ON_ONCE(hwc->idx != idx);

                /* it might be unflagged overflow */
                overflow = p4_pmu_clear_cccr_ovf(hwc);

                val = x86_perf_event_update(event);
                if (!overflow && (val & (1ULL << (x86_pmu.cntval_bits - 1))))
                        continue;

                handled += overflow;

                /* event overflow for sure */
                perf_sample_data_init(&data, 0, hwc->last_period);

                if (!x86_perf_event_set_period(event))
                        continue;


                if (perf_event_overflow(event, &data, regs))
                        x86_pmu_stop(event, 0);
        }

        if (handled)
                inc_irq_stat(apic_perf_irqs);

        /*
         * When dealing with the unmasking of the LVTPC on P4 perf hw, it has
         * been observed that the OVF bit flag has to be cleared first _before_
         * the LVTPC can be unmasked.
         *
         * The reason is the NMI line will continue to be asserted while the OVF
         * bit is set.  This causes a second NMI to generate if the LVTPC is
         * unmasked before the OVF bit is cleared, leading to unknown NMI
         * messages.
         */
        apic_write(APIC_LVTPC, APIC_DM_NMI);

        return handled;
}

/*
 * swap thread specific fields according to a thread
 * we are going to run on
 */
static void p4_pmu_swap_config_ts(struct hw_perf_event *hwc, int cpu)
{
        u32 escr, cccr;

        /*
         * we either lucky and continue on same cpu or no HT support
         */
        if (!p4_should_swap_ts(hwc->config, cpu))
                return;

        /*
         * the event is migrated from an another logical
         * cpu, so we need to swap thread specific flags
         */

        escr = p4_config_unpack_escr(hwc->config);
        cccr = p4_config_unpack_cccr(hwc->config);

        if (p4_ht_thread(cpu)) {
                cccr &= ~P4_CCCR_OVF_PMI_T0;
                cccr |= P4_CCCR_OVF_PMI_T1;
                if (escr & P4_ESCR_T0_OS) {
                        escr &= ~P4_ESCR_T0_OS;
                        escr |= P4_ESCR_T1_OS;
                }
                if (escr & P4_ESCR_T0_USR) {
                        escr &= ~P4_ESCR_T0_USR;
                        escr |= P4_ESCR_T1_USR;
                }
                hwc->config  = p4_config_pack_escr(escr);
                hwc->config |= p4_config_pack_cccr(cccr);
                hwc->config |= P4_CONFIG_HT;
        } else {
                cccr &= ~P4_CCCR_OVF_PMI_T1;
                cccr |= P4_CCCR_OVF_PMI_T0;
                if (escr & P4_ESCR_T1_OS) {
                        escr &= ~P4_ESCR_T1_OS;
                        escr |= P4_ESCR_T0_OS;
                }
                if (escr & P4_ESCR_T1_USR) {
                        escr &= ~P4_ESCR_T1_USR;
                        escr |= P4_ESCR_T0_USR;
                }
                hwc->config  = p4_config_pack_escr(escr);
                hwc->config |= p4_config_pack_cccr(cccr);
                hwc->config &= ~P4_CONFIG_HT;
        }
}

/*
 * ESCR address hashing is tricky, ESCRs are not sequential
 * in memory but all starts from MSR_P4_BSU_ESCR0 (0x03a0) and
 * the metric between any ESCRs is laid in range [0xa0,0xe1]
 *
 * so we make ~70% filled hashtable
 */

#define P4_ESCR_MSR_BASE                0x000003a0
#define P4_ESCR_MSR_MAX                 0x000003e1
#define P4_ESCR_MSR_TABLE_SIZE          (P4_ESCR_MSR_MAX - P4_ESCR_MSR_BASE + 1)
#define P4_ESCR_MSR_IDX(msr)            (msr - P4_ESCR_MSR_BASE)
#define P4_ESCR_MSR_TABLE_ENTRY(msr)    [P4_ESCR_MSR_IDX(msr)] = msr

static const unsigned int p4_escr_table[P4_ESCR_MSR_TABLE_SIZE] = {
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_ALF_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_ALF_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_BPU_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_BPU_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_BSU_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_BSU_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_CRU_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_CRU_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_CRU_ESCR2),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_CRU_ESCR3),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_CRU_ESCR4),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_CRU_ESCR5),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_DAC_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_DAC_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_FIRM_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_FIRM_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_FLAME_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_FLAME_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_FSB_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_FSB_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_IQ_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_IQ_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_IS_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_IS_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_ITLB_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_ITLB_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_IX_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_IX_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_MOB_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_MOB_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_MS_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_MS_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_PMH_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_PMH_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_RAT_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_RAT_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_SAAT_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_SAAT_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_SSU_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_SSU_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_TBPU_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_TBPU_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_TC_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_TC_ESCR1),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_U2L_ESCR0),
        P4_ESCR_MSR_TABLE_ENTRY(MSR_P4_U2L_ESCR1),
};

static int p4_get_escr_idx(unsigned int addr)
{
        unsigned int idx = P4_ESCR_MSR_IDX(addr);

        if (unlikely(idx >= P4_ESCR_MSR_TABLE_SIZE      ||
                        !p4_escr_table[idx]             ||
                        p4_escr_table[idx] != addr)) {
                WARN_ONCE(1, "P4 PMU: Wrong address passed: %x\n", addr);
                return -1;
        }

        return idx;
}

static int p4_next_cntr(int thread, unsigned long *used_mask,
                        struct p4_event_bind *bind)
{
        int i, j;

        for (i = 0; i < P4_CNTR_LIMIT; i++) {
                j = bind->cntr[thread][i];
                if (j != -1 && !test_bit(j, used_mask))
                        return j;
        }

        return -1;
}

static int p4_pmu_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
{
        unsigned long used_mask[BITS_TO_LONGS(X86_PMC_IDX_MAX)];
        unsigned long escr_mask[BITS_TO_LONGS(P4_ESCR_MSR_TABLE_SIZE)];
        int cpu = smp_processor_id();
        struct hw_perf_event *hwc;
        struct p4_event_bind *bind;
        unsigned int i, thread, num;
        int cntr_idx, escr_idx;
        u64 config_alias;
        int pass;

        bitmap_zero(used_mask, X86_PMC_IDX_MAX);
        bitmap_zero(escr_mask, P4_ESCR_MSR_TABLE_SIZE);

        for (i = 0, num = n; i < n; i++, num--) {

                hwc = &cpuc->event_list[i]->hw;
                thread = p4_ht_thread(cpu);
                pass = 0;

again:
                /*
                 * It's possible to hit a circular lock
                 * between original and alternative events
                 * if both are scheduled already.
                 */
                if (pass > 2)
                        goto done;

                bind = p4_config_get_bind(hwc->config);
                escr_idx = p4_get_escr_idx(bind->escr_msr[thread]);
                if (unlikely(escr_idx == -1))
                        goto done;

                if (hwc->idx != -1 && !p4_should_swap_ts(hwc->config, cpu)) {
                        cntr_idx = hwc->idx;
                        if (assign)
                                assign[i] = hwc->idx;
                        goto reserve;
                }

                cntr_idx = p4_next_cntr(thread, used_mask, bind);
                if (cntr_idx == -1 || test_bit(escr_idx, escr_mask)) {
                        /*
                         * Check whether an event alias is still available.
                         */
                        config_alias = p4_get_alias_event(hwc->config);
                        if (!config_alias)
                                goto done;
                        hwc->config = config_alias;
                        pass++;
                        goto again;
                }
                /*
                 * Perf does test runs to see if a whole group can be assigned
                 * together successfully.  There can be multiple rounds of this.
                 * Unfortunately, p4_pmu_swap_config_ts touches the hwc->config
                 * bits, such that the next round of group assignments will
                 * cause the above p4_should_swap_ts to pass instead of fail.
                 * This leads to counters exclusive to thread0 being used by
                 * thread1.
                 *
                 * Solve this with a cheap hack, reset the idx back to -1 to
                 * force a new lookup (p4_next_cntr) to get the right counter
                 * for the right thread.
                 *
                 * This probably doesn't comply with the general spirit of how
                 * perf wants to work, but P4 is special. :-(
                 */
                if (p4_should_swap_ts(hwc->config, cpu))
                        hwc->idx = -1;
                p4_pmu_swap_config_ts(hwc, cpu);
                if (assign)
                        assign[i] = cntr_idx;
reserve:
                set_bit(cntr_idx, used_mask);
                set_bit(escr_idx, escr_mask);
        }

done:
        return num ? -EINVAL : 0;
}

PMU_FORMAT_ATTR(cccr, "config:0-31" );
PMU_FORMAT_ATTR(escr, "config:32-62");
PMU_FORMAT_ATTR(ht,   "config:63"   );

static struct attribute *intel_p4_formats_attr[] = {
        &format_attr_cccr.attr,
        &format_attr_escr.attr,
        &format_attr_ht.attr,
        NULL,
};

static __initconst const struct x86_pmu p4_pmu = {
        .name                   = "Netburst P4/Xeon",
        .handle_irq             = p4_pmu_handle_irq,
        .disable_all            = p4_pmu_disable_all,
        .enable_all             = p4_pmu_enable_all,
        .enable                 = p4_pmu_enable_event,
        .disable                = p4_pmu_disable_event,
        .eventsel               = MSR_P4_BPU_CCCR0,
        .perfctr                = MSR_P4_BPU_PERFCTR0,
        .event_map              = p4_pmu_event_map,
        .max_events             = ARRAY_SIZE(p4_general_events),
        .get_event_constraints  = x86_get_event_constraints,
        /*
         * IF HT disabled we may need to use all
         * ARCH_P4_MAX_CCCR counters simultaneously
         * though leave it restricted at moment assuming
         * HT is on
         */
        .num_counters           = ARCH_P4_MAX_CCCR,
        .apic                   = 1,
        .cntval_bits            = ARCH_P4_CNTRVAL_BITS,
        .cntval_mask            = ARCH_P4_CNTRVAL_MASK,
        .max_period             = (1ULL << (ARCH_P4_CNTRVAL_BITS - 1)) - 1,
        .hw_config              = p4_hw_config,
        .schedule_events        = p4_pmu_schedule_events,
        /*
         * This handles erratum N15 in intel doc 249199-029,
         * the counter may not be updated correctly on write
         * so we need a second write operation to do the trick
         * (the official workaround didn't work)
         *
         * the former idea is taken from OProfile code
         */
        .perfctr_second_write   = 1,

        .format_attrs           = intel_p4_formats_attr,
};

__init int p4_pmu_init(void)
{
        unsigned int low, high;
        int i, reg;

        /* If we get stripped -- indexing fails */
        BUILD_BUG_ON(ARCH_P4_MAX_CCCR > INTEL_PMC_MAX_GENERIC);

        rdmsr(MSR_IA32_MISC_ENABLE, low, high);
        if (!(low & (1 << 7))) {
                pr_cont("unsupported Netburst CPU model %d ",
                        boot_cpu_data.x86_model);
                return -ENODEV;
        }

        memcpy(hw_cache_event_ids, p4_hw_cache_event_ids,
                sizeof(hw_cache_event_ids));

        pr_cont("Netburst events, ");

        x86_pmu = p4_pmu;

        /*
         * Even though the counters are configured to interrupt a particular
         * logical processor when an overflow happens, testing has shown that
         * on kdump kernels (which uses a single cpu), thread1's counter
         * continues to run and will report an NMI on thread0.  Due to the
         * overflow bug, this leads to a stream of unknown NMIs.
         *
         * Solve this by zero'ing out the registers to mimic a reset.
         */
        for (i = 0; i < x86_pmu.num_counters; i++) {
                reg = x86_pmu_config_addr(i);
                wrmsrl_safe(reg, 0ULL);
        }

        return 0;
}