#include <asm/stacktrace.h>
#include <asm/nmi.h>
-static u64 perf_event_mask __read_mostly;
+#if 0
+#undef wrmsrl
+#define wrmsrl(msr, val) \
+do { \
+ trace_printk("wrmsrl(%lx, %lx)\n", (unsigned long)(msr),\
+ (unsigned long)(val)); \
+ native_write_msr((msr), (u32)((u64)(val)), \
+ (u32)((u64)(val) >> 32)); \
+} while (0)
+#endif
+
+/*
+ * best effort, GUP based copy_from_user() that assumes IRQ or NMI context
+ */
+static unsigned long
+copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
+{
+ unsigned long offset, addr = (unsigned long)from;
+ int type = in_nmi() ? KM_NMI : KM_IRQ0;
+ unsigned long size, len = 0;
+ struct page *page;
+ void *map;
+ int ret;
-/* The maximal number of PEBS events: */
-#define MAX_PEBS_EVENTS 4
+ do {
+ ret = __get_user_pages_fast(addr, 1, 0, &page);
+ if (!ret)
+ break;
-/* The size of a BTS record in bytes: */
-#define BTS_RECORD_SIZE 24
+ offset = addr & (PAGE_SIZE - 1);
+ size = min(PAGE_SIZE - offset, n - len);
-/* The size of a per-cpu BTS buffer in bytes: */
-#define BTS_BUFFER_SIZE (BTS_RECORD_SIZE * 2048)
+ map = kmap_atomic(page, type);
+ memcpy(to, map+offset, size);
+ kunmap_atomic(map, type);
+ put_page(page);
-/* The BTS overflow threshold in bytes from the end of the buffer: */
-#define BTS_OVFL_TH (BTS_RECORD_SIZE * 128)
+ len += size;
+ to += size;
+ addr += size;
+ } while (len < n);
-/*
- * Bits in the debugctlmsr controlling branch tracing.
- */
-#define X86_DEBUGCTL_TR (1 << 6)
-#define X86_DEBUGCTL_BTS (1 << 7)
-#define X86_DEBUGCTL_BTINT (1 << 8)
-#define X86_DEBUGCTL_BTS_OFF_OS (1 << 9)
-#define X86_DEBUGCTL_BTS_OFF_USR (1 << 10)
+ return len;
+}
-/*
- * A debug store configuration.
- *
- * We only support architectures that use 64bit fields.
- */
-struct debug_store {
- u64 bts_buffer_base;
- u64 bts_index;
- u64 bts_absolute_maximum;
- u64 bts_interrupt_threshold;
- u64 pebs_buffer_base;
- u64 pebs_index;
- u64 pebs_absolute_maximum;
- u64 pebs_interrupt_threshold;
- u64 pebs_event_reset[MAX_PEBS_EVENTS];
-};
+static u64 perf_event_mask __read_mostly;
struct event_constraint {
union {
struct event_constraint event_constraints[X86_PMC_IDX_MAX];
};
+#define MAX_LBR_ENTRIES 16
+
struct cpu_hw_events {
+ /*
+ * Generic x86 PMC bits
+ */
struct perf_event *events[X86_PMC_IDX_MAX]; /* in counter order */
unsigned long active_mask[BITS_TO_LONGS(X86_PMC_IDX_MAX)];
unsigned long interrupts;
int enabled;
- struct debug_store *ds;
int n_events;
int n_added;
int assign[X86_PMC_IDX_MAX]; /* event to counter assignment */
u64 tags[X86_PMC_IDX_MAX];
struct perf_event *event_list[X86_PMC_IDX_MAX]; /* in enabled order */
+
+ /*
+ * Intel DebugStore bits
+ */
+ struct debug_store *ds;
+ u64 pebs_enabled;
+
+ /*
+ * Intel LBR bits
+ */
+ int lbr_users;
+ void *lbr_context;
+ struct perf_branch_stack lbr_stack;
+ struct perf_branch_entry lbr_entries[MAX_LBR_ENTRIES];
+
+ /*
+ * AMD specific bits
+ */
struct amd_nb *amd_nb;
};
#define EVENT_CONSTRAINT(c, n, m) \
__EVENT_CONSTRAINT(c, n, m, HWEIGHT(n))
+/*
+ * Constraint on the Event code.
+ */
#define INTEL_EVENT_CONSTRAINT(c, n) \
EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVTSEL_MASK)
+/*
+ * Constraint on the Event code + UMask + fixed-mask
+ */
#define FIXED_EVENT_CONSTRAINT(c, n) \
EVENT_CONSTRAINT(c, (1ULL << (32+n)), INTEL_ARCH_FIXED_MASK)
+/*
+ * Constraint on the Event code + UMask
+ */
+#define PEBS_EVENT_CONSTRAINT(c, n) \
+ EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVENT_MASK)
+
#define EVENT_CONSTRAINT_END \
EVENT_CONSTRAINT(0, 0, 0)
#define for_each_event_constraint(e, c) \
for ((e) = (c); (e)->cmask; (e)++)
+union perf_capabilities {
+ struct {
+ u64 lbr_format : 6;
+ u64 pebs_trap : 1;
+ u64 pebs_arch_reg : 1;
+ u64 pebs_format : 4;
+ u64 smm_freeze : 1;
+ };
+ u64 capabilities;
+};
+
/*
* struct x86_pmu - generic x86 pmu
*/
struct x86_pmu {
+ /*
+ * Generic x86 PMC bits
+ */
const char *name;
int version;
int (*handle_irq)(struct pt_regs *);
u64 event_mask;
int apic;
u64 max_period;
- u64 intel_ctrl;
- void (*enable_bts)(u64 config);
- void (*disable_bts)(void);
-
struct event_constraint *
(*get_event_constraints)(struct cpu_hw_events *cpuc,
struct perf_event *event);
void (*put_event_constraints)(struct cpu_hw_events *cpuc,
struct perf_event *event);
struct event_constraint *event_constraints;
+ void (*quirks)(void);
void (*cpu_prepare)(int cpu);
void (*cpu_starting)(int cpu);
void (*cpu_dying)(int cpu);
void (*cpu_dead)(int cpu);
+
+ /*
+ * Intel Arch Perfmon v2+
+ */
+ u64 intel_ctrl;
+ union perf_capabilities intel_cap;
+
+ /*
+ * Intel DebugStore bits
+ */
+ int bts, pebs;
+ int pebs_record_size;
+ void (*drain_pebs)(struct pt_regs *regs);
+ struct event_constraint *pebs_constraints;
+
+ /*
+ * Intel LBR
+ */
+ unsigned long lbr_tos, lbr_from, lbr_to; /* MSR base regs */
+ int lbr_nr; /* hardware stack size */
};
static struct x86_pmu x86_pmu __read_mostly;
#endif
}
-static inline bool bts_available(void)
-{
- return x86_pmu.enable_bts != NULL;
-}
-
-static void init_debug_store_on_cpu(int cpu)
-{
- struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
-
- if (!ds)
- return;
-
- wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA,
- (u32)((u64)(unsigned long)ds),
- (u32)((u64)(unsigned long)ds >> 32));
-}
-
-static void fini_debug_store_on_cpu(int cpu)
-{
- if (!per_cpu(cpu_hw_events, cpu).ds)
- return;
-
- wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 0, 0);
-}
-
-static void release_bts_hardware(void)
-{
- int cpu;
-
- if (!bts_available())
- return;
-
- get_online_cpus();
-
- for_each_online_cpu(cpu)
- fini_debug_store_on_cpu(cpu);
-
- for_each_possible_cpu(cpu) {
- struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
-
- if (!ds)
- continue;
-
- per_cpu(cpu_hw_events, cpu).ds = NULL;
-
- kfree((void *)(unsigned long)ds->bts_buffer_base);
- kfree(ds);
- }
-
- put_online_cpus();
-}
-
-static int reserve_bts_hardware(void)
-{
- int cpu, err = 0;
-
- if (!bts_available())
- return 0;
-
- get_online_cpus();
-
- for_each_possible_cpu(cpu) {
- struct debug_store *ds;
- void *buffer;
-
- err = -ENOMEM;
- buffer = kzalloc(BTS_BUFFER_SIZE, GFP_KERNEL);
- if (unlikely(!buffer))
- break;
-
- ds = kzalloc(sizeof(*ds), GFP_KERNEL);
- if (unlikely(!ds)) {
- kfree(buffer);
- break;
- }
-
- ds->bts_buffer_base = (u64)(unsigned long)buffer;
- ds->bts_index = ds->bts_buffer_base;
- ds->bts_absolute_maximum =
- ds->bts_buffer_base + BTS_BUFFER_SIZE;
- ds->bts_interrupt_threshold =
- ds->bts_absolute_maximum - BTS_OVFL_TH;
-
- per_cpu(cpu_hw_events, cpu).ds = ds;
- err = 0;
- }
-
- if (err)
- release_bts_hardware();
- else {
- for_each_online_cpu(cpu)
- init_debug_store_on_cpu(cpu);
- }
-
- put_online_cpus();
-
- return err;
-}
+static int reserve_ds_buffers(void);
+static void release_ds_buffers(void);
static void hw_perf_event_destroy(struct perf_event *event)
{
if (atomic_dec_and_mutex_lock(&active_events, &pmc_reserve_mutex)) {
release_pmc_hardware();
- release_bts_hardware();
+ release_ds_buffers();
mutex_unlock(&pmc_reserve_mutex);
}
}
if (!reserve_pmc_hardware())
err = -EBUSY;
else
- err = reserve_bts_hardware();
+ err = reserve_ds_buffers();
}
if (!err)
atomic_inc(&active_events);
if ((attr->config == PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
(hwc->sample_period == 1)) {
/* BTS is not supported by this architecture. */
- if (!bts_available())
+ if (!x86_pmu.bts)
return -EOPNOTSUPP;
/* BTS is currently only allowed for user-mode. */
* step2: reprogram moved events into new counters
*/
for (i = 0; i < n_running; i++) {
-
event = cpuc->event_list[i];
hwc = &event->hw;
continue;
x86_pmu_stop(event);
-
- hwc->idx = -1;
}
for (i = 0; i < cpuc->n_events; i++) {
-
event = cpuc->event_list[i];
hwc = &event->hw;
- if (i < n_running &&
- match_prev_assignment(hwc, cpuc, i))
- continue;
-
- if (hwc->idx == -1)
+ if (!match_prev_assignment(hwc, cpuc, i))
x86_assign_hw_event(event, cpuc, i);
+ else if (i < n_running)
+ continue;
x86_pmu_start(event);
}
static inline void __x86_pmu_enable_event(struct hw_perf_event *hwc)
{
- (void)checking_wrmsrl(hwc->config_base + hwc->idx,
+ wrmsrl(hwc->config_base + hwc->idx,
hwc->config | ARCH_PERFMON_EVENTSEL_ENABLE);
}
static inline void x86_pmu_disable_event(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
- (void)checking_wrmsrl(hwc->config_base + hwc->idx, hwc->config);
+
+ wrmsrl(hwc->config_base + hwc->idx, hwc->config);
}
static DEFINE_PER_CPU(u64 [X86_PMC_IDX_MAX], pmc_prev_left);
struct hw_perf_event *hwc = &event->hw;
s64 left = atomic64_read(&hwc->period_left);
s64 period = hwc->sample_period;
- int err, ret = 0, idx = hwc->idx;
+ int ret = 0, idx = hwc->idx;
if (idx == X86_PMC_IDX_FIXED_BTS)
return 0;
*/
atomic64_set(&hwc->prev_count, (u64)-left);
- err = checking_wrmsrl(hwc->event_base + idx,
- (u64)(-left) & x86_pmu.event_mask);
+ wrmsrl(hwc->event_base + idx,
+ (u64)(-left) & x86_pmu.event_mask);
perf_event_update_userpage(event);
void perf_event_print_debug(void)
{
u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left, fixed;
+ u64 pebs;
struct cpu_hw_events *cpuc;
unsigned long flags;
int cpu, idx;
rdmsrl(MSR_CORE_PERF_GLOBAL_STATUS, status);
rdmsrl(MSR_CORE_PERF_GLOBAL_OVF_CTRL, overflow);
rdmsrl(MSR_ARCH_PERFMON_FIXED_CTR_CTRL, fixed);
+ rdmsrl(MSR_IA32_PEBS_ENABLE, pebs);
pr_info("\n");
pr_info("CPU#%d: ctrl: %016llx\n", cpu, ctrl);
pr_info("CPU#%d: status: %016llx\n", cpu, status);
pr_info("CPU#%d: overflow: %016llx\n", cpu, overflow);
pr_info("CPU#%d: fixed: %016llx\n", cpu, fixed);
+ pr_info("CPU#%d: pebs: %016llx\n", cpu, pebs);
}
- pr_info("CPU#%d: active: %016llx\n", cpu, *(u64 *)cpuc->active_mask);
+ pr_info("CPU#%d: active: %016llx\n", cpu, *(u64 *)cpuc->active_mask);
for (idx = 0; idx < x86_pmu.num_events; idx++) {
rdmsrl(x86_pmu.eventsel + idx, pmc_ctrl);
#include "perf_event_amd.c"
#include "perf_event_p6.c"
+#include "perf_event_intel_lbr.c"
+#include "perf_event_intel_ds.c"
#include "perf_event_intel.c"
static int __cpuinit
pr_cont("%s PMU driver.\n", x86_pmu.name);
+ if (x86_pmu.quirks)
+ x86_pmu.quirks();
+
if (x86_pmu.num_events > X86_PMC_MAX_GENERIC) {
WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
x86_pmu.num_events, X86_PMC_MAX_GENERIC);
.unthrottle = x86_pmu_unthrottle,
};
+/*
+ * validate that we can schedule this event
+ */
+static int validate_event(struct perf_event *event)
+{
+ struct cpu_hw_events *fake_cpuc;
+ struct event_constraint *c;
+ int ret = 0;
+
+ fake_cpuc = kmalloc(sizeof(*fake_cpuc), GFP_KERNEL | __GFP_ZERO);
+ if (!fake_cpuc)
+ return -ENOMEM;
+
+ c = x86_pmu.get_event_constraints(fake_cpuc, event);
+
+ if (!c || !c->weight)
+ ret = -ENOSPC;
+
+ if (x86_pmu.put_event_constraints)
+ x86_pmu.put_event_constraints(fake_cpuc, event);
+
+ kfree(fake_cpuc);
+
+ return ret;
+}
+
/*
* validate a single event group
*
if (event->group_leader != event)
err = validate_group(event);
+ else
+ err = validate_event(event);
event->pmu = tmp;
}
dump_trace(NULL, regs, NULL, regs->bp, &backtrace_ops, entry);
}
-/*
- * best effort, GUP based copy_from_user() that assumes IRQ or NMI context
- */
-static unsigned long
-copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
-{
- unsigned long offset, addr = (unsigned long)from;
- int type = in_nmi() ? KM_NMI : KM_IRQ0;
- unsigned long size, len = 0;
- struct page *page;
- void *map;
- int ret;
-
- do {
- ret = __get_user_pages_fast(addr, 1, 0, &page);
- if (!ret)
- break;
-
- offset = addr & (PAGE_SIZE - 1);
- size = min(PAGE_SIZE - offset, n - len);
-
- map = kmap_atomic(page, type);
- memcpy(to, map+offset, size);
- kunmap_atomic(map, type);
- put_page(page);
-
- len += size;
- to += size;
- addr += size;
-
- } while (len < n);
-
- return len;
-}
-
static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
{
unsigned long bytes;
return entry;
}
+
+ void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip)
+ {
+ regs->ip = ip;
+ /*
+ * perf_arch_fetch_caller_regs adds another call, we need to increment
+ * the skip level
+ */
+ regs->bp = rewind_frame_pointer(skip + 1);
+ regs->cs = __KERNEL_CS;
+ local_save_flags(regs->flags);
+ }
+ EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
projects / deliverable / linux.git / commitdiff
