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perf/x86/uncore: add hrtimer to SNB uncore IMC PMU 

This patch is needed because that PMU uses 32-bit free
running counters with no interrupt capabilities.

On SNB/IVB/HSW, we used 20GB/s theoretical peak to calculate
the hrtimer timeout necessary to avoid missing an overflow.
That delay is set to 5s to be on the cautious side.

The SNB IMC uses free running counters, which are handled
via pseudo fixed counters. The SNB IMC PMU implementation
supports an arbitrary number of events, because the counters
are read-only. Therefore it is not possible to track active
counters. Instead we put active events on a linked list which
is then used by the hrtimer handler to update the SW counts.

Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: ak@linux.intel.com
Cc: zheng.z.yan@intel.com
Cc: peterz@infradead.org
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1392132015-14521-8-git-send-email-eranian@google.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
hifive-unleashed-5.1
Stephane Eranian 2014-02-11 16:20:13 +01:00 committed by Thomas Gleixner
parent b9e1ab6d4c
commit ced2efb099
2 changed files with 14 additions and 0 deletions
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12
arch/x86/kernel/cpu/perf_event_intel_uncore.c
View File

@ -1728,6 +1728,7 @@ static void snb_uncore_imc_init_box(struct intel_uncore_box *box)
addr &= ~(PAGE_SIZE - 1);
box->io_addr = ioremap(addr, SNB_UNCORE_PCI_IMC_MAP_SIZE);
box->hrtimer_duration = UNCORE_SNB_IMC_HRTIMER_INTERVAL;
}
static void snb_uncore_imc_enable_box(struct intel_uncore_box *box)
@ -3160,6 +3161,7 @@ again:
static enum hrtimer_restart uncore_pmu_hrtimer(struct hrtimer *hrtimer)
{
struct intel_uncore_box *box;
struct perf_event *event;
unsigned long flags;
int bit;
@ -3172,6 +3174,14 @@ static enum hrtimer_restart uncore_pmu_hrtimer(struct hrtimer *hrtimer)
*/
local_irq_save(flags);
/*
* handle boxes with an active event list as opposed to active
* counters
*/
list_for_each_entry(event, &box->active_list, active_entry) {
uncore_perf_event_update(box, event);
}
for_each_set_bit(bit, box->active_mask, UNCORE_PMC_IDX_MAX)
uncore_perf_event_update(box, box->events[bit]);
@ -3221,6 +3231,8 @@ static struct intel_uncore_box *uncore_alloc_box(struct intel_uncore_type *type,
/* set default hrtimer timeout */
box->hrtimer_duration = UNCORE_PMU_HRTIMER_INTERVAL;
INIT_LIST_HEAD(&box->active_list);
return box;
}

2
arch/x86/kernel/cpu/perf_event_intel_uncore.h
View File

@ -6,6 +6,7 @@
#define UNCORE_PMU_NAME_LEN 32
#define UNCORE_PMU_HRTIMER_INTERVAL (60LL * NSEC_PER_SEC)
#define UNCORE_SNB_IMC_HRTIMER_INTERVAL (5ULL * NSEC_PER_SEC)
#define UNCORE_FIXED_EVENT 0xff
#define UNCORE_PMC_IDX_MAX_GENERIC 8
@ -492,6 +493,7 @@ struct intel_uncore_box {
u64 hrtimer_duration; /* hrtimer timeout for this box */
struct hrtimer hrtimer;
struct list_head list;
struct list_head active_list;
void *io_addr;
struct intel_uncore_extra_reg shared_regs[0];
};