x86: prepare perf_counter to add more cpus

Introduced  struct pmc_x86_ops to add more cpus.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 78 insertions, 28 deletions

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 383d4c6423a1..a3c88529bb72 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -3,6 +3,7 @@
  *
  *  Copyright(C) 2008 Thomas Gleixner <tglx@linutronix.de>
  *  Copyright(C) 2008 Red Hat, Inc., Ingo Molnar
+ *  Copyright(C) 2009 Jaswinder Singh Rajput
  *
  *  For licencing details see kernel-base/COPYING
  */
@@ -38,10 +39,24 @@ struct cpu_hw_counters {
 };
 
 /*
- * Intel PerfMon v3. Used on Core2 and later.
+ * struct pmc_x86_ops - performance counter x86 ops
  */
+struct pmc_x86_ops {
+        u64 (*save_disable_all)         (void);
+        void (*restore_all)             (u64 ctrl);
+        unsigned eventsel;
+        unsigned perfctr;
+        int (*event_map)                (int event);
+        int max_events;
+};
+
+static struct pmc_x86_ops *pmc_ops;
+
 static DEFINE_PER_CPU(struct cpu_hw_counters, cpu_hw_counters);
 
+/*
+ * Intel PerfMon v3. Used on Core2 and later.
+ */
 static const int intel_perfmon_event_map[] =
 {
   [PERF_COUNT_CPU_CYCLES]               = 0x003c,
@@ -53,7 +68,10 @@ static const int intel_perfmon_event_map[] =
   [PERF_COUNT_BUS_CYCLES]               = 0x013c,
 };
 
-static const int max_intel_perfmon_events = ARRAY_SIZE(intel_perfmon_event_map);
+static int pmc_intel_event_map(int event)
+{
+        return intel_perfmon_event_map[event];
+}
 
 /*
  * Propagate counter elapsed time into the generic counter.
@@ -144,38 +162,48 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
         if (hw_event->raw) {
                 hwc->config |= hw_event->type;
         } else {
-                if (hw_event->type >= max_intel_perfmon_events)
+                if (hw_event->type >= pmc_ops->max_events)
                         return -EINVAL;
                 /*
                  * The generic map:
                  */
-                hwc->config |= intel_perfmon_event_map[hw_event->type];
+                hwc->config |= pmc_ops->event_map(hw_event->type);
         }
         counter->wakeup_pending = 0;
 
         return 0;
 }
 
-u64 hw_perf_save_disable(void)
+static u64 pmc_intel_save_disable_all(void)
 {
         u64 ctrl;
 
-        if (unlikely(!perf_counters_initialized))
-                return 0;
-
         rdmsrl(MSR_CORE_PERF_GLOBAL_CTRL, ctrl);
         wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
 
         return ctrl;
 }
+
+u64 hw_perf_save_disable(void)
+{
+        if (unlikely(!perf_counters_initialized))
+                return 0;
+
+        return pmc_ops->save_disable_all();
+}
 EXPORT_SYMBOL_GPL(hw_perf_save_disable);
 
+static void pmc_intel_restore_all(u64 ctrl)
+{
+        wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, ctrl);
+}
+
 void hw_perf_restore(u64 ctrl)
 {
         if (unlikely(!perf_counters_initialized))
                 return;
 
-        wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, ctrl);
+        pmc_ops->restore_all(ctrl);
 }
 EXPORT_SYMBOL_GPL(hw_perf_restore);
 
@@ -291,11 +319,11 @@ fixed_mode_idx(struct perf_counter *counter, struct hw_perf_counter *hwc)
 
         event = hwc->config & ARCH_PERFMON_EVENT_MASK;
 
-        if (unlikely(event == intel_perfmon_event_map[PERF_COUNT_INSTRUCTIONS]))
+        if (unlikely(event == pmc_ops->event_map(PERF_COUNT_INSTRUCTIONS)))
                 return X86_PMC_IDX_FIXED_INSTRUCTIONS;
-        if (unlikely(event == intel_perfmon_event_map[PERF_COUNT_CPU_CYCLES]))
+        if (unlikely(event == pmc_ops->event_map(PERF_COUNT_CPU_CYCLES)))
                 return X86_PMC_IDX_FIXED_CPU_CYCLES;
-        if (unlikely(event == intel_perfmon_event_map[PERF_COUNT_BUS_CYCLES]))
+        if (unlikely(event == pmc_ops->event_map(PERF_COUNT_BUS_CYCLES)))
                 return X86_PMC_IDX_FIXED_BUS_CYCLES;
 
         return -1;
@@ -339,8 +367,8 @@ try_generic:
                         set_bit(idx, cpuc->used);
                         hwc->idx = idx;
                 }
-                hwc->config_base  = MSR_ARCH_PERFMON_EVENTSEL0;
-                hwc->counter_base = MSR_ARCH_PERFMON_PERFCTR0;
+                hwc->config_base  = pmc_ops->eventsel;
+                hwc->counter_base = pmc_ops->perfctr;
         }
 
         perf_counters_lapic_init(hwc->nmi);
@@ -386,8 +414,8 @@ void perf_counter_print_debug(void)
         printk(KERN_INFO "CPU#%d: used:       %016llx\n", cpu, *(u64 *)cpuc->used);
 
         for (idx = 0; idx < nr_counters_generic; idx++) {
-                rdmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + idx, pmc_ctrl);
-                rdmsrl(MSR_ARCH_PERFMON_PERFCTR0  + idx, pmc_count);
+                rdmsrl(pmc_ops->eventsel + idx, pmc_ctrl);
+                rdmsrl(pmc_ops->perfctr  + idx, pmc_count);
 
                 prev_left = per_cpu(prev_left[idx], cpu);
 
@@ -655,29 +683,56 @@ static __read_mostly struct notifier_block perf_counter_nmi_notifier = {
         .priority               = 1
 };
 
-void __init init_hw_perf_counters(void)
+static struct pmc_x86_ops pmc_intel_ops = {
+        .save_disable_all       = pmc_intel_save_disable_all,
+        .restore_all            = pmc_intel_restore_all,
+        .eventsel               = MSR_ARCH_PERFMON_EVENTSEL0,
+        .perfctr                = MSR_ARCH_PERFMON_PERFCTR0,
+        .event_map              = pmc_intel_event_map,
+        .max_events             = ARRAY_SIZE(intel_perfmon_event_map),
+};
+
+static struct pmc_x86_ops *pmc_intel_init(void)
 {
         union cpuid10_eax eax;
         unsigned int ebx;
         unsigned int unused;
         union cpuid10_edx edx;
 
-        if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
-                return;
-
         /*
          * Check whether the Architectural PerfMon supports
          * Branch Misses Retired Event or not.
          */
         cpuid(10, &eax.full, &ebx, &unused, &edx.full);
         if (eax.split.mask_length <= ARCH_PERFMON_BRANCH_MISSES_RETIRED)
-                return;
+                return NULL;
 
         printk(KERN_INFO "Intel Performance Monitoring support detected.\n");
-
         printk(KERN_INFO "... version:         %d\n", eax.split.version_id);
-        printk(KERN_INFO "... num counters:    %d\n", eax.split.num_counters);
+        printk(KERN_INFO "... bit width:       %d\n", eax.split.bit_width);
+        printk(KERN_INFO "... mask length:     %d\n", eax.split.mask_length);
+
         nr_counters_generic = eax.split.num_counters;
+        nr_counters_fixed = edx.split.num_counters_fixed;
+        counter_value_mask = (1ULL << eax.split.bit_width) - 1;
+
+        return &pmc_intel_ops;
+}
+
+void __init init_hw_perf_counters(void)
+{
+        if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
+                return;
+
+        switch (boot_cpu_data.x86_vendor) {
+        case X86_VENDOR_INTEL:
+                pmc_ops = pmc_intel_init();
+                break;
+        }
+        if (!pmc_ops)
+                return;
+
+        printk(KERN_INFO "... num counters:    %d\n", nr_counters_generic);
         if (nr_counters_generic > X86_PMC_MAX_GENERIC) {
                 nr_counters_generic = X86_PMC_MAX_GENERIC;
                 WARN(1, KERN_ERR "hw perf counters %d > max(%d), clipping!",
@@ -686,13 +741,8 @@ void __init init_hw_perf_counters(void)
         perf_counter_mask = (1 << nr_counters_generic) - 1;
         perf_max_counters = nr_counters_generic;
 
-        printk(KERN_INFO "... bit width:       %d\n", eax.split.bit_width);
-        counter_value_mask = (1ULL << eax.split.bit_width) - 1;
         printk(KERN_INFO "... value mask:      %016Lx\n", counter_value_mask);
 
-        printk(KERN_INFO "... mask length:     %d\n", eax.split.mask_length);
-
-        nr_counters_fixed = edx.split.num_counters_fixed;
         if (nr_counters_fixed > X86_PMC_MAX_FIXED) {
                 nr_counters_fixed = X86_PMC_MAX_FIXED;
                 WARN(1, KERN_ERR "hw perf counters fixed %d > max(%d), clipping!",