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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull perf fixes from Ingo Molnar:
 "Misc fixes plus a small hw-enablement patch for Intel IB model 58
  uncore events"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL
  perf/x86/intel/lbr: Fix LBR filter
  perf/x86: Blacklist all MEM_*_RETIRED events for Ivy Bridge
  perf: Fix vmalloc ring buffer pages handling
  perf/x86/intel: Fix unintended variable name reuse
  perf/x86/intel: Add support for IvyBridge model 58 Uncore
  perf/x86/intel: Fix typo in perf_event_intel_uncore.c
  x86: Eliminate irq_mis_count counted in arch_irq_stat
This commit is contained in:
Linus Torvalds 2013-05-05 11:37:16 -07:00
commit 64049d1973
5 changed files with 51 additions and 26 deletions
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13
arch/x86/kernel/cpu/perf_event_intel.c
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@ -128,10 +128,15 @@ static struct event_constraint intel_ivb_event_constraints[] __read_mostly =
INTEL_UEVENT_CONSTRAINT(0x08a3, 0x4), /* CYCLE_ACTIVITY.CYCLES_L1D_PENDING */
INTEL_UEVENT_CONSTRAINT(0x0ca3, 0x4), /* CYCLE_ACTIVITY.STALLS_L1D_PENDING */
INTEL_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PREC_DIST */
INTEL_EVENT_CONSTRAINT(0xd0, 0xf), /* MEM_UOPS_RETIRED.* */
INTEL_EVENT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */
INTEL_EVENT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
INTEL_EVENT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
/*
* Errata BV98 -- MEM_*_RETIRED events can leak between counters of SMT
* siblings; disable these events because they can corrupt unrelated
* counters.
*/
INTEL_EVENT_CONSTRAINT(0xd0, 0x0), /* MEM_UOPS_RETIRED.* */
INTEL_EVENT_CONSTRAINT(0xd1, 0x0), /* MEM_LOAD_UOPS_RETIRED.* */
INTEL_EVENT_CONSTRAINT(0xd2, 0x0), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
INTEL_EVENT_CONSTRAINT(0xd3, 0x0), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
EVENT_CONSTRAINT_END
};

27
arch/x86/kernel/cpu/perf_event_intel_lbr.c
View File

@ -310,7 +310,7 @@ void intel_pmu_lbr_read(void)
* - in case there is no HW filter
* - in case the HW filter has errata or limitations
*/
static void intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
static int intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
{
u64 br_type = event->attr.branch_sample_type;
int mask = 0;
@ -318,8 +318,11 @@ static void intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
if (br_type & PERF_SAMPLE_BRANCH_USER)
mask |= X86_BR_USER;
if (br_type & PERF_SAMPLE_BRANCH_KERNEL)
if (br_type & PERF_SAMPLE_BRANCH_KERNEL) {
if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
return -EACCES;
mask |= X86_BR_KERNEL;
}
/* we ignore BRANCH_HV here */
@ -339,6 +342,8 @@ static void intel_pmu_setup_sw_lbr_filter(struct perf_event *event)
* be used by fixup code for some CPU
*/
event->hw.branch_reg.reg = mask;
return 0;
}
/*
@ -386,7 +391,9 @@ int intel_pmu_setup_lbr_filter(struct perf_event *event)
/*
* setup SW LBR filter
*/
intel_pmu_setup_sw_lbr_filter(event);
ret = intel_pmu_setup_sw_lbr_filter(event);
if (ret)
return ret;
/*
* setup HW LBR filter, if any
@ -442,8 +449,18 @@ static int branch_type(unsigned long from, unsigned long to)
return X86_BR_NONE;
addr = buf;
} else
addr = (void *)from;
} else {
/*
* The LBR logs any address in the IP, even if the IP just
* faulted. This means userspace can control the from address.
* Ensure we don't blindy read any address by validating it is
* a known text address.
*/
if (kernel_text_address(from))
addr = (void *)from;
else
return X86_BR_NONE;
}
/*
* decoder needs to know the ABI especially

19
arch/x86/kernel/cpu/perf_event_intel_uncore.c
View File

@ -3093,7 +3093,7 @@ static void __init uncore_types_exit(struct intel_uncore_type **types)
static int __init uncore_type_init(struct intel_uncore_type *type)
{
struct intel_uncore_pmu *pmus;
struct attribute_group *events_group;
struct attribute_group *attr_group;
struct attribute **attrs;
int i, j;
@ -3120,19 +3120,19 @@ static int __init uncore_type_init(struct intel_uncore_type *type)
while (type->event_descs[i].attr.attr.name)
i++;
events_group = kzalloc(sizeof(struct attribute *) * (i + 1) +
sizeof(*events_group), GFP_KERNEL);
if (!events_group)
attr_group = kzalloc(sizeof(struct attribute *) * (i + 1) +
sizeof(*attr_group), GFP_KERNEL);
if (!attr_group)
goto fail;
attrs = (struct attribute **)(events_group + 1);
events_group->name = "events";
events_group->attrs = attrs;
attrs = (struct attribute **)(attr_group + 1);
attr_group->name = "events";
attr_group->attrs = attrs;
for (j = 0; j < i; j++)
attrs[j] = &type->event_descs[j].attr.attr;
type->events_group = events_group;
type->events_group = attr_group;
}
type->pmu_group = &uncore_pmu_attr_group;
@ -3545,11 +3545,12 @@ static int __init uncore_cpu_init(void)
msr_uncores = nhm_msr_uncores;
break;
case 42: /* Sandy Bridge */
case 58: /* Ivy Bridge */
if (snb_uncore_cbox.num_boxes > max_cores)
snb_uncore_cbox.num_boxes = max_cores;
msr_uncores = snb_msr_uncores;
break;
case 45: /* Sandy Birdge-EP */
case 45: /* Sandy Bridge-EP */
if (snbep_uncore_cbox.num_boxes > max_cores)
snbep_uncore_cbox.num_boxes = max_cores;
msr_uncores = snbep_msr_uncores;

4
arch/x86/kernel/irq.c
View File

@ -165,10 +165,6 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
u64 arch_irq_stat(void)
{
u64 sum = atomic_read(&irq_err_count);
#ifdef CONFIG_X86_IO_APIC
sum += atomic_read(&irq_mis_count);
#endif
return sum;
}

14
kernel/events/ring_buffer.c
View File

@ -326,11 +326,16 @@ void rb_free(struct ring_buffer *rb)
}
#else
static int data_page_nr(struct ring_buffer *rb)
{
return rb->nr_pages << page_order(rb);
}
struct page *
perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)
{
if (pgoff > (1UL << page_order(rb)))
/* The '>' counts in the user page. */
if (pgoff > data_page_nr(rb))
return NULL;
return vmalloc_to_page((void *)rb->user_page + pgoff * PAGE_SIZE);
@ -350,10 +355,11 @@ static void rb_free_work(struct work_struct *work)
int i, nr;
rb = container_of(work, struct ring_buffer, work);
nr = 1 << page_order(rb);
nr = data_page_nr(rb);
base = rb->user_page;
for (i = 0; i < nr + 1; i++)
/* The '<=' counts in the user page. */
for (i = 0; i <= nr; i++)
perf_mmap_unmark_page(base + (i * PAGE_SIZE));
vfree(base);
@ -387,7 +393,7 @@ struct ring_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
rb->user_page = all_buf;
rb->data_pages[0] = all_buf + PAGE_SIZE;
rb->page_order = ilog2(nr_pages);
rb->nr_pages = 1;
rb->nr_pages = !!nr_pages;
ring_buffer_init(rb, watermark, flags);