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Date: Tue, 9 Apr 2013 10:23:52 -0500
From: Jacob Shin <jacob.shin@....com>
To: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC: "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>, <x86@...nel.org>,
Stephane Eranian <eranian@...gle.com>,
Jiri Olsa <jolsa@...hat.com>, <linux-kernel@...r.kernel.org>,
Jacob Shin <jacob.shin@....com>
Subject: [PATCH RESEND 1/3] perf, amd: Further generalize NB event constraints handling logic
In preparation for enabling AMD L2I performance counters, we will
further generalize NB event constraints handling logic to now allow
any type of shared counters. This is just a code rework, there are
no functional changes.
Signed-off-by: Jacob Shin <jacob.shin@....com>
---
arch/x86/kernel/cpu/perf_event.h | 6 +--
arch/x86/kernel/cpu/perf_event_amd.c | 70 +++++++++++++++++-----------------
2 files changed, 38 insertions(+), 38 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index ba9aadf..f092dfe 100644
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -68,8 +68,8 @@ struct event_constraint {
#define PERF_X86_EVENT_PEBS_LDLAT 0x1 /* ld+ldlat data address sampling */
#define PERF_X86_EVENT_PEBS_ST 0x2 /* st data address sampling */
-struct amd_nb {
- int nb_id; /* NorthBridge id */
+struct amd_shared_regs {
+ int id;
int refcnt; /* reference count */
struct perf_event *owners[X86_PMC_IDX_MAX];
struct event_constraint event_constraints[X86_PMC_IDX_MAX];
@@ -170,7 +170,7 @@ struct cpu_hw_events {
/*
* AMD specific bits
*/
- struct amd_nb *amd_nb;
+ struct amd_shared_regs *amd_nb;
/* Inverted mask of bits to clear in the perf_ctr ctrl registers */
u64 perf_ctr_virt_mask;
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index dfdab42..23964a6 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -292,9 +292,9 @@ static inline int amd_is_perfctr_nb_event(struct hw_perf_event *hwc)
static inline int amd_has_nb(struct cpu_hw_events *cpuc)
{
- struct amd_nb *nb = cpuc->amd_nb;
+ struct amd_shared_regs *nb = cpuc->amd_nb;
- return nb && nb->nb_id != -1;
+ return nb && nb->id != -1;
}
static int amd_pmu_hw_config(struct perf_event *event)
@@ -321,10 +321,9 @@ static int amd_pmu_hw_config(struct perf_event *event)
return amd_core_hw_config(event);
}
-static void __amd_put_nb_event_constraints(struct cpu_hw_events *cpuc,
- struct perf_event *event)
+static void amd_put_shared_event_constraints(struct amd_shared_regs *regs,
+ struct perf_event *event)
{
- struct amd_nb *nb = cpuc->amd_nb;
int i;
/*
@@ -336,7 +335,7 @@ static void __amd_put_nb_event_constraints(struct cpu_hw_events *cpuc,
* when we come here
*/
for (i = 0; i < x86_pmu.num_counters; i++) {
- if (cmpxchg(nb->owners + i, event, NULL) == event)
+ if (cmpxchg(regs->owners + i, event, NULL) == event)
break;
}
}
@@ -386,16 +385,17 @@ static void amd_nb_interrupt_hw_config(struct hw_perf_event *hwc)
*
* Given that resources are allocated (cmpxchg), they must be
* eventually freed for others to use. This is accomplished by
- * calling __amd_put_nb_event_constraints()
+ * calling amd_put_shared_event_constraints()
*
* Non NB events are not impacted by this restriction.
*/
static struct event_constraint *
-__amd_get_nb_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event,
- struct event_constraint *c)
+amd_get_shared_event_constraints(struct cpu_hw_events *cpuc,
+ struct amd_shared_regs *regs,
+ struct perf_event *event,
+ struct event_constraint *c)
{
struct hw_perf_event *hwc = &event->hw;
- struct amd_nb *nb = cpuc->amd_nb;
struct perf_event *old;
int idx, new = -1;
@@ -418,8 +418,8 @@ __amd_get_nb_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *ev
for_each_set_bit(idx, c->idxmsk, x86_pmu.num_counters) {
if (new == -1 || hwc->idx == idx)
/* assign free slot, prefer hwc->idx */
- old = cmpxchg(nb->owners + idx, NULL, event);
- else if (nb->owners[idx] == event)
+ old = cmpxchg(regs->owners + idx, NULL, event);
+ else if (regs->owners[idx] == event)
/* event already present */
old = event;
else
@@ -430,7 +430,7 @@ __amd_get_nb_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *ev
/* reassign to this slot */
if (new != -1)
- cmpxchg(nb->owners + new, event, NULL);
+ cmpxchg(regs->owners + new, event, NULL);
new = idx;
/* already present, reuse */
@@ -444,29 +444,29 @@ __amd_get_nb_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *ev
if (amd_is_perfctr_nb_event(hwc))
amd_nb_interrupt_hw_config(hwc);
- return &nb->event_constraints[new];
+ return ®s->event_constraints[new];
}
-static struct amd_nb *amd_alloc_nb(int cpu)
+static struct amd_shared_regs *amd_alloc_shared_regs(int cpu)
{
- struct amd_nb *nb;
+ struct amd_shared_regs *regs;
int i;
- nb = kmalloc_node(sizeof(struct amd_nb), GFP_KERNEL | __GFP_ZERO,
- cpu_to_node(cpu));
- if (!nb)
+ regs = kmalloc_node(sizeof(struct amd_shared_regs),
+ GFP_KERNEL | __GFP_ZERO, cpu_to_node(cpu));
+ if (!regs)
return NULL;
- nb->nb_id = -1;
+ regs->id = -1;
/*
- * initialize all possible NB constraints
+ * initialize all possible constraints
*/
for (i = 0; i < x86_pmu.num_counters; i++) {
- __set_bit(i, nb->event_constraints[i].idxmsk);
- nb->event_constraints[i].weight = 1;
+ __set_bit(i, regs->event_constraints[i].idxmsk);
+ regs->event_constraints[i].weight = 1;
}
- return nb;
+ return regs;
}
static int amd_pmu_cpu_prepare(int cpu)
@@ -478,7 +478,7 @@ static int amd_pmu_cpu_prepare(int cpu)
if (boot_cpu_data.x86_max_cores < 2)
return NOTIFY_OK;
- cpuc->amd_nb = amd_alloc_nb(cpu);
+ cpuc->amd_nb = amd_alloc_shared_regs(cpu);
if (!cpuc->amd_nb)
return NOTIFY_BAD;
@@ -488,7 +488,7 @@ static int amd_pmu_cpu_prepare(int cpu)
static void amd_pmu_cpu_starting(int cpu)
{
struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu);
- struct amd_nb *nb;
+ struct amd_shared_regs *nb;
int i, nb_id;
cpuc->perf_ctr_virt_mask = AMD64_EVENTSEL_HOSTONLY;
@@ -504,14 +504,14 @@ static void amd_pmu_cpu_starting(int cpu)
if (WARN_ON_ONCE(!nb))
continue;
- if (nb->nb_id == nb_id) {
+ if (nb->id == nb_id) {
cpuc->kfree_on_online = cpuc->amd_nb;
cpuc->amd_nb = nb;
break;
}
}
- cpuc->amd_nb->nb_id = nb_id;
+ cpuc->amd_nb->id = nb_id;
cpuc->amd_nb->refcnt++;
}
@@ -525,9 +525,9 @@ static void amd_pmu_cpu_dead(int cpu)
cpuhw = &per_cpu(cpu_hw_events, cpu);
if (cpuhw->amd_nb) {
- struct amd_nb *nb = cpuhw->amd_nb;
+ struct amd_shared_regs *nb = cpuhw->amd_nb;
- if (nb->nb_id == -1 || --nb->refcnt == 0)
+ if (nb->id == -1 || --nb->refcnt == 0)
kfree(nb);
cpuhw->amd_nb = NULL;
@@ -543,15 +543,15 @@ amd_get_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event)
if (!(amd_has_nb(cpuc) && amd_is_nb_event(&event->hw)))
return &unconstrained;
- return __amd_get_nb_event_constraints(cpuc, event,
- amd_nb_event_constraint);
+ return amd_get_shared_event_constraints(cpuc, cpuc->amd_nb, event,
+ amd_nb_event_constraint);
}
static void amd_put_event_constraints(struct cpu_hw_events *cpuc,
struct perf_event *event)
{
if (amd_has_nb(cpuc) && amd_is_nb_event(&event->hw))
- __amd_put_nb_event_constraints(cpuc, event);
+ amd_put_shared_event_constraints(cpuc->amd_nb, event);
}
PMU_FORMAT_ATTR(event, "config:0-7,32-35");
@@ -711,8 +711,8 @@ amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, struct perf_event *ev
return &amd_f15_PMC20;
}
case AMD_EVENT_NB:
- return __amd_get_nb_event_constraints(cpuc, event,
- amd_nb_event_constraint);
+ return amd_get_shared_event_constraints(cpuc, cpuc->amd_nb,
+ event, amd_nb_event_constraint);
default:
return &emptyconstraint;
}
--
1.7.9.5
--
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