#ifdef CONFIG_CPU_SUP_INTEL
  
  /*

   * Intel PerfMon, used on Core and later.

   */
  static const u64 intel_perfmon_event_map[] =
  {
    [PERF_COUNT_HW_CPU_CYCLES]		= 0x003c,
    [PERF_COUNT_HW_INSTRUCTIONS]		= 0x00c0,
    [PERF_COUNT_HW_CACHE_REFERENCES]	= 0x4f2e,
    [PERF_COUNT_HW_CACHE_MISSES]		= 0x412e,
    [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]	= 0x00c4,
    [PERF_COUNT_HW_BRANCH_MISSES]		= 0x00c5,
    [PERF_COUNT_HW_BUS_CYCLES]		= 0x013c,
  };
  
  static struct event_constraint intel_core_event_constraints[] =
  {
  	INTEL_EVENT_CONSTRAINT(0x11, 0x2), /* FP_ASSIST */
  	INTEL_EVENT_CONSTRAINT(0x12, 0x2), /* MUL */
  	INTEL_EVENT_CONSTRAINT(0x13, 0x2), /* DIV */
  	INTEL_EVENT_CONSTRAINT(0x14, 0x1), /* CYCLES_DIV_BUSY */
  	INTEL_EVENT_CONSTRAINT(0x19, 0x2), /* DELAYED_BYPASS */
  	INTEL_EVENT_CONSTRAINT(0xc1, 0x1), /* FP_COMP_INSTR_RET */
  	EVENT_CONSTRAINT_END
  };
  
  static struct event_constraint intel_core2_event_constraints[] =
  {

  	FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
  	FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
  	/*
  	 * Core2 has Fixed Counter 2 listed as CPU_CLK_UNHALTED.REF and event
  	 * 0x013c as CPU_CLK_UNHALTED.BUS and specifies there is a fixed
  	 * ratio between these counters.
  	 */
  	/* FIXED_EVENT_CONSTRAINT(0x013c, 2),  CPU_CLK_UNHALTED.REF */

  	INTEL_EVENT_CONSTRAINT(0x10, 0x1), /* FP_COMP_OPS_EXE */
  	INTEL_EVENT_CONSTRAINT(0x11, 0x2), /* FP_ASSIST */
  	INTEL_EVENT_CONSTRAINT(0x12, 0x2), /* MUL */
  	INTEL_EVENT_CONSTRAINT(0x13, 0x2), /* DIV */
  	INTEL_EVENT_CONSTRAINT(0x14, 0x1), /* CYCLES_DIV_BUSY */
  	INTEL_EVENT_CONSTRAINT(0x18, 0x1), /* IDLE_DURING_DIV */
  	INTEL_EVENT_CONSTRAINT(0x19, 0x2), /* DELAYED_BYPASS */
  	INTEL_EVENT_CONSTRAINT(0xa1, 0x1), /* RS_UOPS_DISPATCH_CYCLES */

  	INTEL_EVENT_CONSTRAINT(0xc9, 0x1), /* ITLB_MISS_RETIRED (T30-9) */

  	INTEL_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED */
  	EVENT_CONSTRAINT_END
  };
  
  static struct event_constraint intel_nehalem_event_constraints[] =
  {

  	FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
  	FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
  	/* FIXED_EVENT_CONSTRAINT(0x013c, 2), CPU_CLK_UNHALTED.REF */

  	INTEL_EVENT_CONSTRAINT(0x40, 0x3), /* L1D_CACHE_LD */
  	INTEL_EVENT_CONSTRAINT(0x41, 0x3), /* L1D_CACHE_ST */
  	INTEL_EVENT_CONSTRAINT(0x42, 0x3), /* L1D_CACHE_LOCK */
  	INTEL_EVENT_CONSTRAINT(0x43, 0x3), /* L1D_ALL_REF */
  	INTEL_EVENT_CONSTRAINT(0x48, 0x3), /* L1D_PEND_MISS */
  	INTEL_EVENT_CONSTRAINT(0x4e, 0x3), /* L1D_PREFETCH */
  	INTEL_EVENT_CONSTRAINT(0x51, 0x3), /* L1D */
  	INTEL_EVENT_CONSTRAINT(0x63, 0x3), /* CACHE_LOCK_CYCLES */
  	EVENT_CONSTRAINT_END
  };
  
  static struct event_constraint intel_westmere_event_constraints[] =
  {

  	FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
  	FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
  	/* FIXED_EVENT_CONSTRAINT(0x013c, 2), CPU_CLK_UNHALTED.REF */

  	INTEL_EVENT_CONSTRAINT(0x51, 0x3), /* L1D */
  	INTEL_EVENT_CONSTRAINT(0x60, 0x1), /* OFFCORE_REQUESTS_OUTSTANDING */
  	INTEL_EVENT_CONSTRAINT(0x63, 0x3), /* CACHE_LOCK_CYCLES */

  	INTEL_EVENT_CONSTRAINT(0xb3, 0x1), /* SNOOPQ_REQUEST_OUTSTANDING */

  	EVENT_CONSTRAINT_END
  };
  
  static struct event_constraint intel_gen_event_constraints[] =
  {

  	FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
  	FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
  	/* FIXED_EVENT_CONSTRAINT(0x013c, 2), CPU_CLK_UNHALTED.REF */

  	EVENT_CONSTRAINT_END
  };
  
  static u64 intel_pmu_event_map(int hw_event)
  {
  	return intel_perfmon_event_map[hw_event];
  }

  static __initconst const u64 westmere_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) ] = 0x010b, /* MEM_INST_RETIRED.LOADS       */
  		[ C(RESULT_MISS)   ] = 0x0151, /* L1D.REPL                     */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x020b, /* MEM_INST_RETURED.STORES      */
  		[ C(RESULT_MISS)   ] = 0x0251, /* L1D.M_REPL                   */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x014e, /* L1D_PREFETCH.REQUESTS        */
  		[ C(RESULT_MISS)   ] = 0x024e, /* L1D_PREFETCH.MISS            */
  	},
   },
   [ C(L1I ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0380, /* L1I.READS                    */
  		[ C(RESULT_MISS)   ] = 0x0280, /* L1I.MISSES                   */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0,
  		[ C(RESULT_MISS)   ] = 0x0,
  	},
   },
   [ C(LL  ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0324, /* L2_RQSTS.LOADS               */
  		[ C(RESULT_MISS)   ] = 0x0224, /* L2_RQSTS.LD_MISS             */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0c24, /* L2_RQSTS.RFOS                */
  		[ C(RESULT_MISS)   ] = 0x0824, /* L2_RQSTS.RFO_MISS            */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x4f2e, /* LLC Reference                */
  		[ C(RESULT_MISS)   ] = 0x412e, /* LLC Misses                   */
  	},
   },
   [ C(DTLB) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x010b, /* MEM_INST_RETIRED.LOADS       */
  		[ C(RESULT_MISS)   ] = 0x0108, /* DTLB_LOAD_MISSES.ANY         */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x020b, /* MEM_INST_RETURED.STORES      */
  		[ C(RESULT_MISS)   ] = 0x010c, /* MEM_STORE_RETIRED.DTLB_MISS  */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0,
  		[ C(RESULT_MISS)   ] = 0x0,
  	},
   },
   [ C(ITLB) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x01c0, /* INST_RETIRED.ANY_P           */
  		[ C(RESULT_MISS)   ] = 0x0185, /* ITLB_MISSES.ANY              */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
   },
   [ C(BPU ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x00c4, /* BR_INST_RETIRED.ALL_BRANCHES */
  		[ C(RESULT_MISS)   ] = 0x03e8, /* BPU_CLEARS.ANY               */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
   },
  };

  static __initconst const u64 nehalem_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) ] = 0x0f40, /* L1D_CACHE_LD.MESI            */
  		[ C(RESULT_MISS)   ] = 0x0140, /* L1D_CACHE_LD.I_STATE         */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0f41, /* L1D_CACHE_ST.MESI            */
  		[ C(RESULT_MISS)   ] = 0x0141, /* L1D_CACHE_ST.I_STATE         */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x014e, /* L1D_PREFETCH.REQUESTS        */
  		[ C(RESULT_MISS)   ] = 0x024e, /* L1D_PREFETCH.MISS            */
  	},
   },
   [ C(L1I ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0380, /* L1I.READS                    */
  		[ C(RESULT_MISS)   ] = 0x0280, /* L1I.MISSES                   */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0,
  		[ C(RESULT_MISS)   ] = 0x0,
  	},
   },
   [ C(LL  ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0324, /* L2_RQSTS.LOADS               */
  		[ C(RESULT_MISS)   ] = 0x0224, /* L2_RQSTS.LD_MISS             */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0c24, /* L2_RQSTS.RFOS                */
  		[ C(RESULT_MISS)   ] = 0x0824, /* L2_RQSTS.RFO_MISS            */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x4f2e, /* LLC Reference                */
  		[ C(RESULT_MISS)   ] = 0x412e, /* LLC Misses                   */
  	},
   },
   [ C(DTLB) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0f40, /* L1D_CACHE_LD.MESI   (alias)  */
  		[ C(RESULT_MISS)   ] = 0x0108, /* DTLB_LOAD_MISSES.ANY         */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0f41, /* L1D_CACHE_ST.MESI   (alias)  */
  		[ C(RESULT_MISS)   ] = 0x010c, /* MEM_STORE_RETIRED.DTLB_MISS  */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0,
  		[ C(RESULT_MISS)   ] = 0x0,
  	},
   },
   [ C(ITLB) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x01c0, /* INST_RETIRED.ANY_P           */
  		[ C(RESULT_MISS)   ] = 0x20c8, /* ITLB_MISS_RETIRED            */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
   },
   [ C(BPU ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x00c4, /* BR_INST_RETIRED.ALL_BRANCHES */
  		[ C(RESULT_MISS)   ] = 0x03e8, /* BPU_CLEARS.ANY               */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
   },
  };

  static __initconst const u64 core2_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) ] = 0x0f40, /* L1D_CACHE_LD.MESI          */
  		[ C(RESULT_MISS)   ] = 0x0140, /* L1D_CACHE_LD.I_STATE       */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0f41, /* L1D_CACHE_ST.MESI          */
  		[ C(RESULT_MISS)   ] = 0x0141, /* L1D_CACHE_ST.I_STATE       */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x104e, /* L1D_PREFETCH.REQUESTS      */
  		[ C(RESULT_MISS)   ] = 0,
  	},
   },
   [ C(L1I ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0080, /* L1I.READS                  */
  		[ C(RESULT_MISS)   ] = 0x0081, /* L1I.MISSES                 */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0,
  		[ C(RESULT_MISS)   ] = 0,
  	},
   },
   [ C(LL  ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x4f29, /* L2_LD.MESI                 */
  		[ C(RESULT_MISS)   ] = 0x4129, /* L2_LD.ISTATE               */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x4f2A, /* L2_ST.MESI                 */
  		[ C(RESULT_MISS)   ] = 0x412A, /* L2_ST.ISTATE               */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0,
  		[ C(RESULT_MISS)   ] = 0,
  	},
   },
   [ C(DTLB) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0f40, /* L1D_CACHE_LD.MESI  (alias) */
  		[ C(RESULT_MISS)   ] = 0x0208, /* DTLB_MISSES.MISS_LD        */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0f41, /* L1D_CACHE_ST.MESI  (alias) */
  		[ C(RESULT_MISS)   ] = 0x0808, /* DTLB_MISSES.MISS_ST        */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0,
  		[ C(RESULT_MISS)   ] = 0,
  	},
   },
   [ C(ITLB) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x00c0, /* INST_RETIRED.ANY_P         */
  		[ C(RESULT_MISS)   ] = 0x1282, /* ITLBMISSES                 */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
   },
   [ C(BPU ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x00c4, /* BR_INST_RETIRED.ANY        */
  		[ C(RESULT_MISS)   ] = 0x00c5, /* BP_INST_RETIRED.MISPRED    */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
   },
  };

  static __initconst const u64 atom_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) ] = 0x2140, /* L1D_CACHE.LD               */
  		[ C(RESULT_MISS)   ] = 0,
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x2240, /* L1D_CACHE.ST               */
  		[ C(RESULT_MISS)   ] = 0,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0,
  		[ C(RESULT_MISS)   ] = 0,
  	},
   },
   [ C(L1I ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x0380, /* L1I.READS                  */
  		[ C(RESULT_MISS)   ] = 0x0280, /* L1I.MISSES                 */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0,
  		[ C(RESULT_MISS)   ] = 0,
  	},
   },
   [ C(LL  ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x4f29, /* L2_LD.MESI                 */
  		[ C(RESULT_MISS)   ] = 0x4129, /* L2_LD.ISTATE               */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x4f2A, /* L2_ST.MESI                 */
  		[ C(RESULT_MISS)   ] = 0x412A, /* L2_ST.ISTATE               */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0,
  		[ C(RESULT_MISS)   ] = 0,
  	},
   },
   [ C(DTLB) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x2140, /* L1D_CACHE_LD.MESI  (alias) */
  		[ C(RESULT_MISS)   ] = 0x0508, /* DTLB_MISSES.MISS_LD        */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = 0x2240, /* L1D_CACHE_ST.MESI  (alias) */
  		[ C(RESULT_MISS)   ] = 0x0608, /* DTLB_MISSES.MISS_ST        */
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = 0,
  		[ C(RESULT_MISS)   ] = 0,
  	},
   },
   [ C(ITLB) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x00c0, /* INST_RETIRED.ANY_P         */
  		[ C(RESULT_MISS)   ] = 0x0282, /* ITLB.MISSES                */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
   },
   [ C(BPU ) ] = {
  	[ C(OP_READ) ] = {
  		[ C(RESULT_ACCESS) ] = 0x00c4, /* BR_INST_RETIRED.ANY        */
  		[ C(RESULT_MISS)   ] = 0x00c5, /* BP_INST_RETIRED.MISPRED    */
  	},
  	[ C(OP_WRITE) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
  	[ C(OP_PREFETCH) ] = {
  		[ C(RESULT_ACCESS) ] = -1,
  		[ C(RESULT_MISS)   ] = -1,
  	},
   },
  };

  static void intel_pmu_disable_all(void)
  {
  	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
  
  	wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
  
  	if (test_bit(X86_PMC_IDX_FIXED_BTS, cpuc->active_mask))
  		intel_pmu_disable_bts();

  
  	intel_pmu_pebs_disable_all();

  	intel_pmu_lbr_disable_all();

  }

  static void intel_pmu_enable_all(int added)

  {
  	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);

  	intel_pmu_pebs_enable_all();
  	intel_pmu_lbr_enable_all();

  	wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, x86_pmu.intel_ctrl);
  
  	if (test_bit(X86_PMC_IDX_FIXED_BTS, cpuc->active_mask)) {
  		struct perf_event *event =
  			cpuc->events[X86_PMC_IDX_FIXED_BTS];
  
  		if (WARN_ON_ONCE(!event))
  			return;
  
  		intel_pmu_enable_bts(event->hw.config);
  	}
  }

  /*
   * Workaround for:
   *   Intel Errata AAK100 (model 26)
   *   Intel Errata AAP53  (model 30)

   *   Intel Errata BD53   (model 44)

   *

   * The official story:
   *   These chips need to be 'reset' when adding counters by programming the
   *   magic three (non-counting) events 0x4300B5, 0x4300D2, and 0x4300B1 either
   *   in sequence on the same PMC or on different PMCs.
   *
   * In practise it appears some of these events do in fact count, and
   * we need to programm all 4 events.

   */

  static void intel_pmu_nhm_workaround(void)

  {

  	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
  	static const unsigned long nhm_magic[4] = {
  		0x4300B5,
  		0x4300D2,
  		0x4300B1,
  		0x4300B1
  	};
  	struct perf_event *event;
  	int i;

  	/*
  	 * The Errata requires below steps:
  	 * 1) Clear MSR_IA32_PEBS_ENABLE and MSR_CORE_PERF_GLOBAL_CTRL;
  	 * 2) Configure 4 PERFEVTSELx with the magic events and clear
  	 *    the corresponding PMCx;
  	 * 3) set bit0~bit3 of MSR_CORE_PERF_GLOBAL_CTRL;
  	 * 4) Clear MSR_CORE_PERF_GLOBAL_CTRL;
  	 * 5) Clear 4 pairs of ERFEVTSELx and PMCx;
  	 */

  	/*
  	 * The real steps we choose are a little different from above.
  	 * A) To reduce MSR operations, we don't run step 1) as they
  	 *    are already cleared before this function is called;
  	 * B) Call x86_perf_event_update to save PMCx before configuring
  	 *    PERFEVTSELx with magic number;
  	 * C) With step 5), we do clear only when the PERFEVTSELx is
  	 *    not used currently.
  	 * D) Call x86_perf_event_set_period to restore PMCx;
  	 */

  	/* We always operate 4 pairs of PERF Counters */
  	for (i = 0; i < 4; i++) {
  		event = cpuc->events[i];
  		if (event)
  			x86_perf_event_update(event);
  	}

  	for (i = 0; i < 4; i++) {
  		wrmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + i, nhm_magic[i]);
  		wrmsrl(MSR_ARCH_PERFMON_PERFCTR0 + i, 0x0);
  	}
  
  	wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0xf);
  	wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0x0);

  	for (i = 0; i < 4; i++) {
  		event = cpuc->events[i];
  
  		if (event) {
  			x86_perf_event_set_period(event);

  			__x86_pmu_enable_event(&event->hw,

  					ARCH_PERFMON_EVENTSEL_ENABLE);
  		} else
  			wrmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + i, 0x0);

  	}

  }
  
  static void intel_pmu_nhm_enable_all(int added)
  {
  	if (added)
  		intel_pmu_nhm_workaround();

  	intel_pmu_enable_all(added);
  }

  static inline u64 intel_pmu_get_status(void)
  {
  	u64 status;
  
  	rdmsrl(MSR_CORE_PERF_GLOBAL_STATUS, status);
  
  	return status;
  }
  
  static inline void intel_pmu_ack_status(u64 ack)
  {
  	wrmsrl(MSR_CORE_PERF_GLOBAL_OVF_CTRL, ack);
  }

  static void intel_pmu_disable_fixed(struct hw_perf_event *hwc)

  {

  	int idx = hwc->idx - X86_PMC_IDX_FIXED;

  	u64 ctrl_val, mask;
  
  	mask = 0xfULL << (idx * 4);
  
  	rdmsrl(hwc->config_base, ctrl_val);
  	ctrl_val &= ~mask;

  	wrmsrl(hwc->config_base, ctrl_val);

  }

  static void intel_pmu_disable_event(struct perf_event *event)

  {

  	struct hw_perf_event *hwc = &event->hw;
  
  	if (unlikely(hwc->idx == X86_PMC_IDX_FIXED_BTS)) {

  		intel_pmu_disable_bts();
  		intel_pmu_drain_bts_buffer();
  		return;
  	}
  
  	if (unlikely(hwc->config_base == MSR_ARCH_PERFMON_FIXED_CTR_CTRL)) {

  		intel_pmu_disable_fixed(hwc);

  		return;
  	}

  	x86_pmu_disable_event(event);

  	if (unlikely(event->attr.precise_ip))

  		intel_pmu_pebs_disable(event);

  }

  static void intel_pmu_enable_fixed(struct hw_perf_event *hwc)

  {

  	int idx = hwc->idx - X86_PMC_IDX_FIXED;

  	u64 ctrl_val, bits, mask;

  
  	/*
  	 * Enable IRQ generation (0x8),
  	 * and enable ring-3 counting (0x2) and ring-0 counting (0x1)
  	 * if requested:
  	 */
  	bits = 0x8ULL;
  	if (hwc->config & ARCH_PERFMON_EVENTSEL_USR)
  		bits |= 0x2;
  	if (hwc->config & ARCH_PERFMON_EVENTSEL_OS)
  		bits |= 0x1;
  
  	/*
  	 * ANY bit is supported in v3 and up
  	 */
  	if (x86_pmu.version > 2 && hwc->config & ARCH_PERFMON_EVENTSEL_ANY)
  		bits |= 0x4;
  
  	bits <<= (idx * 4);
  	mask = 0xfULL << (idx * 4);
  
  	rdmsrl(hwc->config_base, ctrl_val);
  	ctrl_val &= ~mask;
  	ctrl_val |= bits;

  	wrmsrl(hwc->config_base, ctrl_val);

  }

  static void intel_pmu_enable_event(struct perf_event *event)

  {

  	struct hw_perf_event *hwc = &event->hw;
  
  	if (unlikely(hwc->idx == X86_PMC_IDX_FIXED_BTS)) {

  		if (!__get_cpu_var(cpu_hw_events).enabled)
  			return;
  
  		intel_pmu_enable_bts(hwc->config);
  		return;
  	}
  
  	if (unlikely(hwc->config_base == MSR_ARCH_PERFMON_FIXED_CTR_CTRL)) {

  		intel_pmu_enable_fixed(hwc);

  		return;
  	}

  	if (unlikely(event->attr.precise_ip))

  		intel_pmu_pebs_enable(event);

  	__x86_pmu_enable_event(hwc, ARCH_PERFMON_EVENTSEL_ENABLE);

  }
  
  /*
   * Save and restart an expired event. Called by NMI contexts,
   * so it has to be careful about preempting normal event ops:
   */
  static int intel_pmu_save_and_restart(struct perf_event *event)
  {

  	x86_perf_event_update(event);
  	return x86_perf_event_set_period(event);

  }
  
  static void intel_pmu_reset(void)
  {
  	struct debug_store *ds = __get_cpu_var(cpu_hw_events).ds;
  	unsigned long flags;
  	int idx;

  	if (!x86_pmu.num_counters)

  		return;
  
  	local_irq_save(flags);
  
  	printk("clearing PMU state on CPU#%d
  ", smp_processor_id());

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

  		checking_wrmsrl(x86_pmu.eventsel + idx, 0ull);
  		checking_wrmsrl(x86_pmu.perfctr  + idx, 0ull);
  	}

  	for (idx = 0; idx < x86_pmu.num_counters_fixed; idx++)

  		checking_wrmsrl(MSR_ARCH_PERFMON_FIXED_CTR0 + idx, 0ull);

  	if (ds)
  		ds->bts_index = ds->bts_buffer_base;
  
  	local_irq_restore(flags);
  }
  
  /*
   * This handler is triggered by the local APIC, so the APIC IRQ handling
   * rules apply:
   */
  static int intel_pmu_handle_irq(struct pt_regs *regs)
  {
  	struct perf_sample_data data;
  	struct cpu_hw_events *cpuc;
  	int bit, loops;

  	u64 status;

  	int handled;

  	perf_sample_data_init(&data, 0);

  
  	cpuc = &__get_cpu_var(cpu_hw_events);

  	intel_pmu_disable_all();

  	handled = intel_pmu_drain_bts_buffer();

  	status = intel_pmu_get_status();
  	if (!status) {

  		intel_pmu_enable_all(0);

  		return handled;

  	}
  
  	loops = 0;
  again:

  	intel_pmu_ack_status(status);

  	if (++loops > 100) {
  		WARN_ONCE(1, "perfevents: irq loop stuck!
  ");
  		perf_event_print_debug();
  		intel_pmu_reset();

  		goto done;

  	}
  
  	inc_irq_stat(apic_perf_irqs);

  	intel_pmu_lbr_read();

  	/*
  	 * PEBS overflow sets bit 62 in the global status register
  	 */

  	if (__test_and_clear_bit(62, (unsigned long *)&status)) {
  		handled++;

  		x86_pmu.drain_pebs(regs);

  	}

  	for_each_set_bit(bit, (unsigned long *)&status, X86_PMC_IDX_MAX) {

  		struct perf_event *event = cpuc->events[bit];

  		handled++;

  		if (!test_bit(bit, cpuc->active_mask))
  			continue;
  
  		if (!intel_pmu_save_and_restart(event))
  			continue;
  
  		data.period = event->hw.last_period;
  
  		if (perf_event_overflow(event, 1, &data, regs))

  			x86_pmu_stop(event, 0);

  	}

  	/*
  	 * Repeat if there is more work to be done:
  	 */
  	status = intel_pmu_get_status();
  	if (status)
  		goto again;

  done:

  	intel_pmu_enable_all(0);

  	return handled;

  }

  static struct event_constraint *

  intel_bts_constraints(struct perf_event *event)

  {

  	struct hw_perf_event *hwc = &event->hw;
  	unsigned int hw_event, bts_event;

  	hw_event = hwc->config & INTEL_ARCH_EVENT_MASK;
  	bts_event = x86_pmu.event_map(PERF_COUNT_HW_BRANCH_INSTRUCTIONS);

  	if (unlikely(hw_event == bts_event && hwc->sample_period == 1))

  		return &bts_constraint;

  	return NULL;
  }
  
  static struct event_constraint *
  intel_get_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event)
  {
  	struct event_constraint *c;

  	c = intel_bts_constraints(event);
  	if (c)
  		return c;
  
  	c = intel_pebs_constraints(event);

  	if (c)
  		return c;
  
  	return x86_get_event_constraints(cpuc, event);
  }

  static int intel_pmu_hw_config(struct perf_event *event)
  {
  	int ret = x86_pmu_hw_config(event);
  
  	if (ret)
  		return ret;
  
  	if (event->attr.type != PERF_TYPE_RAW)
  		return 0;
  
  	if (!(event->attr.config & ARCH_PERFMON_EVENTSEL_ANY))
  		return 0;
  
  	if (x86_pmu.version < 3)
  		return -EINVAL;
  
  	if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
  		return -EACCES;
  
  	event->hw.config |= ARCH_PERFMON_EVENTSEL_ANY;
  
  	return 0;
  }

  static __initconst const struct x86_pmu core_pmu = {

  	.name			= "core",
  	.handle_irq		= x86_pmu_handle_irq,
  	.disable_all		= x86_pmu_disable_all,
  	.enable_all		= x86_pmu_enable_all,
  	.enable			= x86_pmu_enable_event,
  	.disable		= x86_pmu_disable_event,

  	.hw_config		= x86_pmu_hw_config,

  	.schedule_events	= x86_schedule_events,

  	.eventsel		= MSR_ARCH_PERFMON_EVENTSEL0,
  	.perfctr		= MSR_ARCH_PERFMON_PERFCTR0,
  	.event_map		= intel_pmu_event_map,

  	.max_events		= ARRAY_SIZE(intel_perfmon_event_map),
  	.apic			= 1,
  	/*
  	 * Intel PMCs cannot be accessed sanely above 32 bit width,
  	 * so we install an artificial 1<<31 period regardless of
  	 * the generic event period:
  	 */
  	.max_period		= (1ULL << 31) - 1,
  	.get_event_constraints	= intel_get_event_constraints,
  	.event_constraints	= intel_core_event_constraints,
  };

  static void intel_pmu_cpu_starting(int cpu)
  {
  	init_debug_store_on_cpu(cpu);
  	/*
  	 * Deal with CPUs that don't clear their LBRs on power-up.
  	 */
  	intel_pmu_lbr_reset();
  }
  
  static void intel_pmu_cpu_dying(int cpu)
  {
  	fini_debug_store_on_cpu(cpu);
  }

  static __initconst const struct x86_pmu intel_pmu = {

  	.name			= "Intel",
  	.handle_irq		= intel_pmu_handle_irq,
  	.disable_all		= intel_pmu_disable_all,
  	.enable_all		= intel_pmu_enable_all,
  	.enable			= intel_pmu_enable_event,
  	.disable		= intel_pmu_disable_event,

  	.hw_config		= intel_pmu_hw_config,

  	.schedule_events	= x86_schedule_events,

  	.eventsel		= MSR_ARCH_PERFMON_EVENTSEL0,
  	.perfctr		= MSR_ARCH_PERFMON_PERFCTR0,
  	.event_map		= intel_pmu_event_map,

  	.max_events		= ARRAY_SIZE(intel_perfmon_event_map),
  	.apic			= 1,
  	/*
  	 * Intel PMCs cannot be accessed sanely above 32 bit width,
  	 * so we install an artificial 1<<31 period regardless of
  	 * the generic event period:
  	 */
  	.max_period		= (1ULL << 31) - 1,

  	.get_event_constraints	= intel_get_event_constraints,

  	.cpu_starting		= intel_pmu_cpu_starting,
  	.cpu_dying		= intel_pmu_cpu_dying,

  };

  static void intel_clovertown_quirks(void)
  {
  	/*
  	 * PEBS is unreliable due to:
  	 *
  	 *   AJ67  - PEBS may experience CPL leaks
  	 *   AJ68  - PEBS PMI may be delayed by one event
  	 *   AJ69  - GLOBAL_STATUS[62] will only be set when DEBUGCTL[12]
  	 *   AJ106 - FREEZE_LBRS_ON_PMI doesn't work in combination with PEBS
  	 *
  	 * AJ67 could be worked around by restricting the OS/USR flags.
  	 * AJ69 could be worked around by setting PMU_FREEZE_ON_PMI.
  	 *
  	 * AJ106 could possibly be worked around by not allowing LBR
  	 *       usage from PEBS, including the fixup.
  	 * AJ68  could possibly be worked around by always programming
  	 * 	 a pebs_event_reset[0] value and coping with the lost events.
  	 *
  	 * But taken together it might just make sense to not enable PEBS on
  	 * these chips.
  	 */
  	printk(KERN_WARNING "PEBS disabled due to CPU errata.
  ");
  	x86_pmu.pebs = 0;
  	x86_pmu.pebs_constraints = NULL;
  }

  static __init int intel_pmu_init(void)
  {
  	union cpuid10_edx edx;
  	union cpuid10_eax eax;
  	unsigned int unused;
  	unsigned int ebx;
  	int version;
  
  	if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {

  		switch (boot_cpu_data.x86) {
  		case 0x6:
  			return p6_pmu_init();
  		case 0xf:
  			return p4_pmu_init();
  		}

  		return -ENODEV;

  	}
  
  	/*
  	 * Check whether the Architectural PerfMon supports
  	 * Branch Misses Retired hw_event or not.
  	 */
  	cpuid(10, &eax.full, &ebx, &unused, &edx.full);
  	if (eax.split.mask_length <= ARCH_PERFMON_BRANCH_MISSES_RETIRED)
  		return -ENODEV;
  
  	version = eax.split.version_id;
  	if (version < 2)
  		x86_pmu = core_pmu;
  	else
  		x86_pmu = intel_pmu;
  
  	x86_pmu.version			= version;

  	x86_pmu.num_counters		= eax.split.num_counters;
  	x86_pmu.cntval_bits		= eax.split.bit_width;
  	x86_pmu.cntval_mask		= (1ULL << eax.split.bit_width) - 1;

  
  	/*
  	 * Quirk: v2 perfmon does not report fixed-purpose events, so
  	 * assume at least 3 events:
  	 */
  	if (version > 1)

  		x86_pmu.num_counters_fixed = max((int)edx.split.num_counters_fixed, 3);

  	/*
  	 * v2 and above have a perf capabilities MSR
  	 */
  	if (version > 1) {
  		u64 capabilities;
  
  		rdmsrl(MSR_IA32_PERF_CAPABILITIES, capabilities);
  		x86_pmu.intel_cap.capabilities = capabilities;
  	}

  	intel_ds_init();

  	/*
  	 * Install the hw-cache-events table:
  	 */
  	switch (boot_cpu_data.x86_model) {
  	case 14: /* 65 nm core solo/duo, "Yonah" */
  		pr_cont("Core events, ");
  		break;
  
  	case 15: /* original 65 nm celeron/pentium/core2/xeon, "Merom"/"Conroe" */

  		x86_pmu.quirks = intel_clovertown_quirks;

  	case 22: /* single-core 65 nm celeron/core2solo "Merom-L"/"Conroe-L" */
  	case 23: /* current 45 nm celeron/core2/xeon "Penryn"/"Wolfdale" */
  	case 29: /* six-core 45 nm xeon "Dunnington" */
  		memcpy(hw_cache_event_ids, core2_hw_cache_event_ids,
  		       sizeof(hw_cache_event_ids));

  		intel_pmu_lbr_init_core();

  		x86_pmu.event_constraints = intel_core2_event_constraints;
  		pr_cont("Core2 events, ");
  		break;
  
  	case 26: /* 45 nm nehalem, "Bloomfield" */
  	case 30: /* 45 nm nehalem, "Lynnfield" */

  	case 46: /* 45 nm nehalem-ex, "Beckton" */

  		memcpy(hw_cache_event_ids, nehalem_hw_cache_event_ids,
  		       sizeof(hw_cache_event_ids));

  		intel_pmu_lbr_init_nhm();

  		x86_pmu.event_constraints = intel_nehalem_event_constraints;

  		x86_pmu.enable_all = intel_pmu_nhm_enable_all;
  		pr_cont("Nehalem events, ");

  		break;

  	case 28: /* Atom */

  		memcpy(hw_cache_event_ids, atom_hw_cache_event_ids,
  		       sizeof(hw_cache_event_ids));

  		intel_pmu_lbr_init_atom();

  		x86_pmu.event_constraints = intel_gen_event_constraints;
  		pr_cont("Atom events, ");
  		break;
  
  	case 37: /* 32 nm nehalem, "Clarkdale" */
  	case 44: /* 32 nm nehalem, "Gulftown" */
  		memcpy(hw_cache_event_ids, westmere_hw_cache_event_ids,
  		       sizeof(hw_cache_event_ids));

  		intel_pmu_lbr_init_nhm();

  		x86_pmu.event_constraints = intel_westmere_event_constraints;

  		x86_pmu.enable_all = intel_pmu_nhm_enable_all;

  		pr_cont("Westmere events, ");
  		break;

  	default:
  		/*
  		 * default constraints for v2 and up
  		 */
  		x86_pmu.event_constraints = intel_gen_event_constraints;
  		pr_cont("generic architected perfmon, ");
  	}
  	return 0;
  }
  
  #else /* CONFIG_CPU_SUP_INTEL */
  
  static int intel_pmu_init(void)
  {
  	return 0;
  }
  
  #endif /* CONFIG_CPU_SUP_INTEL */