[tip:perf/core] perf: Add generic PCI uncore PMU device support
From: tip-bot for Yan, Zheng
Date: Wed Jun 20 2012 - 06:56:16 EST
Commit-ID: 14371cce03c2fc393997e17f979e76674b7f392a
Gitweb: http://git.kernel.org/tip/14371cce03c2fc393997e17f979e76674b7f392a
Author: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
AuthorDate: Fri, 15 Jun 2012 14:31:36 +0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 18 Jun 2012 12:13:23 +0200
perf: Add generic PCI uncore PMU device support
This patch adds generic support for uncore PMUs presented as
PCI devices. (These come in addition to the CPU/MSR based
uncores.)
Signed-off-by: Zheng Yan <zheng.z.yan@xxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1339741902-8449-8-git-send-email-zheng.z.yan@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/cpu/perf_event_intel_uncore.c | 175 ++++++++++++++++++++++++-
arch/x86/kernel/cpu/perf_event_intel_uncore.h | 66 +++++++++
2 files changed, 236 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index 3ed941a..e20c65a 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -2,6 +2,11 @@
static struct intel_uncore_type *empty_uncore[] = { NULL, };
static struct intel_uncore_type **msr_uncores = empty_uncore;
+static struct intel_uncore_type **pci_uncores = empty_uncore;
+/* pci bus to socket mapping */
+static int pcibus_to_physid[256] = { [0 ... 255] = -1, };
+
+static DEFINE_RAW_SPINLOCK(uncore_box_lock);
/* mask of cpus that collect uncore events */
static cpumask_t uncore_cpu_mask;
@@ -205,13 +210,13 @@ static void uncore_assign_hw_event(struct intel_uncore_box *box,
hwc->last_tag = ++box->tags[idx];
if (hwc->idx == UNCORE_PMC_IDX_FIXED) {
- hwc->event_base = uncore_msr_fixed_ctr(box);
- hwc->config_base = uncore_msr_fixed_ctl(box);
+ hwc->event_base = uncore_fixed_ctr(box);
+ hwc->config_base = uncore_fixed_ctl(box);
return;
}
- hwc->config_base = uncore_msr_event_ctl(box, hwc->idx);
- hwc->event_base = uncore_msr_perf_ctr(box, hwc->idx);
+ hwc->config_base = uncore_event_ctl(box, hwc->idx);
+ hwc->event_base = uncore_perf_ctr(box, hwc->idx);
}
static void uncore_perf_event_update(struct intel_uncore_box *box,
@@ -305,6 +310,22 @@ struct intel_uncore_box *uncore_alloc_box(int cpu)
static struct intel_uncore_box *
uncore_pmu_to_box(struct intel_uncore_pmu *pmu, int cpu)
{
+ static struct intel_uncore_box *box;
+
+ box = *per_cpu_ptr(pmu->box, cpu);
+ if (box)
+ return box;
+
+ raw_spin_lock(&uncore_box_lock);
+ list_for_each_entry(box, &pmu->box_list, list) {
+ if (box->phys_id == topology_physical_package_id(cpu)) {
+ atomic_inc(&box->refcnt);
+ *per_cpu_ptr(pmu->box, cpu) = box;
+ break;
+ }
+ }
+ raw_spin_unlock(&uncore_box_lock);
+
return *per_cpu_ptr(pmu->box, cpu);
}
@@ -706,6 +727,13 @@ static void __init uncore_type_exit(struct intel_uncore_type *type)
type->attr_groups[1] = NULL;
}
+static void uncore_types_exit(struct intel_uncore_type **types)
+{
+ int i;
+ for (i = 0; types[i]; i++)
+ uncore_type_exit(types[i]);
+}
+
static int __init uncore_type_init(struct intel_uncore_type *type)
{
struct intel_uncore_pmu *pmus;
@@ -725,6 +753,7 @@ static int __init uncore_type_init(struct intel_uncore_type *type)
pmus[i].func_id = -1;
pmus[i].pmu_idx = i;
pmus[i].type = type;
+ INIT_LIST_HEAD(&pmus[i].box_list);
pmus[i].box = alloc_percpu(struct intel_uncore_box *);
if (!pmus[i].box)
goto fail;
@@ -773,6 +802,127 @@ fail:
return ret;
}
+static struct pci_driver *uncore_pci_driver;
+static bool pcidrv_registered;
+
+/*
+ * add a pci uncore device
+ */
+static int __devinit uncore_pci_add(struct intel_uncore_type *type,
+ struct pci_dev *pdev)
+{
+ struct intel_uncore_pmu *pmu;
+ struct intel_uncore_box *box;
+ int i, phys_id;
+
+ phys_id = pcibus_to_physid[pdev->bus->number];
+ if (phys_id < 0)
+ return -ENODEV;
+
+ box = uncore_alloc_box(0);
+ if (!box)
+ return -ENOMEM;
+
+ /*
+ * for performance monitoring unit with multiple boxes,
+ * each box has a different function id.
+ */
+ for (i = 0; i < type->num_boxes; i++) {
+ pmu = &type->pmus[i];
+ if (pmu->func_id == pdev->devfn)
+ break;
+ if (pmu->func_id < 0) {
+ pmu->func_id = pdev->devfn;
+ break;
+ }
+ pmu = NULL;
+ }
+
+ if (!pmu) {
+ kfree(box);
+ return -EINVAL;
+ }
+
+ box->phys_id = phys_id;
+ box->pci_dev = pdev;
+ box->pmu = pmu;
+ uncore_box_init(box);
+ pci_set_drvdata(pdev, box);
+
+ raw_spin_lock(&uncore_box_lock);
+ list_add_tail(&box->list, &pmu->box_list);
+ raw_spin_unlock(&uncore_box_lock);
+
+ return 0;
+}
+
+static void __devexit uncore_pci_remove(struct pci_dev *pdev)
+{
+ struct intel_uncore_box *box = pci_get_drvdata(pdev);
+ struct intel_uncore_pmu *pmu = box->pmu;
+ int cpu, phys_id = pcibus_to_physid[pdev->bus->number];
+
+ if (WARN_ON_ONCE(phys_id != box->phys_id))
+ return;
+
+ raw_spin_lock(&uncore_box_lock);
+ list_del(&box->list);
+ raw_spin_unlock(&uncore_box_lock);
+
+ for_each_possible_cpu(cpu) {
+ if (*per_cpu_ptr(pmu->box, cpu) == box) {
+ *per_cpu_ptr(pmu->box, cpu) = NULL;
+ atomic_dec(&box->refcnt);
+ }
+ }
+
+ WARN_ON_ONCE(atomic_read(&box->refcnt) != 1);
+ kfree(box);
+}
+
+static int __devinit uncore_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct intel_uncore_type *type;
+
+ type = (struct intel_uncore_type *)id->driver_data;
+ return uncore_pci_add(type, pdev);
+}
+
+static int __init uncore_pci_init(void)
+{
+ int ret;
+
+ switch (boot_cpu_data.x86_model) {
+ default:
+ return 0;
+ }
+
+ ret = uncore_types_init(pci_uncores);
+ if (ret)
+ return ret;
+
+ uncore_pci_driver->probe = uncore_pci_probe;
+ uncore_pci_driver->remove = uncore_pci_remove;
+
+ ret = pci_register_driver(uncore_pci_driver);
+ if (ret == 0)
+ pcidrv_registered = true;
+ else
+ uncore_types_exit(pci_uncores);
+
+ return ret;
+}
+
+static void __init uncore_pci_exit(void)
+{
+ if (pcidrv_registered) {
+ pcidrv_registered = false;
+ pci_unregister_driver(uncore_pci_driver);
+ uncore_types_exit(pci_uncores);
+ }
+}
+
static void __cpuinit uncore_cpu_dying(int cpu)
{
struct intel_uncore_type *type;
@@ -921,6 +1071,7 @@ static void __cpuinit uncore_event_exit_cpu(int cpu)
cpumask_set_cpu(target, &uncore_cpu_mask);
uncore_change_context(msr_uncores, cpu, target);
+ uncore_change_context(pci_uncores, cpu, target);
}
static void __cpuinit uncore_event_init_cpu(int cpu)
@@ -936,6 +1087,7 @@ static void __cpuinit uncore_event_init_cpu(int cpu)
cpumask_set_cpu(cpu, &uncore_cpu_mask);
uncore_change_context(msr_uncores, -1, cpu);
+ uncore_change_context(pci_uncores, -1, cpu);
}
static int __cpuinit uncore_cpu_notifier(struct notifier_block *self,
@@ -1051,6 +1203,14 @@ static int __init uncore_pmus_register(void)
}
}
+ for (i = 0; pci_uncores[i]; i++) {
+ type = pci_uncores[i];
+ for (j = 0; j < type->num_boxes; j++) {
+ pmu = &type->pmus[j];
+ uncore_pmu_register(pmu);
+ }
+ }
+
return 0;
}
@@ -1061,9 +1221,14 @@ static int __init intel_uncore_init(void)
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return -ENODEV;
- ret = uncore_cpu_init();
+ ret = uncore_pci_init();
if (ret)
goto fail;
+ ret = uncore_cpu_init();
+ if (ret) {
+ uncore_pci_exit();
+ goto fail;
+ }
uncore_pmus_register();
return 0;
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.h b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
index eeb5ca5..aa01df8 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.h
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
@@ -1,5 +1,6 @@
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/pci.h>
#include <linux/perf_event.h>
#include "perf_event.h"
@@ -110,6 +111,7 @@ struct intel_uncore_pmu {
int func_id;
struct intel_uncore_type *type;
struct intel_uncore_box ** __percpu box;
+ struct list_head box_list;
};
struct intel_uncore_box {
@@ -123,6 +125,7 @@ struct intel_uncore_box {
struct perf_event *event_list[UNCORE_PMC_IDX_MAX];
unsigned long active_mask[BITS_TO_LONGS(UNCORE_PMC_IDX_MAX)];
u64 tags[UNCORE_PMC_IDX_MAX];
+ struct pci_dev *pci_dev;
struct intel_uncore_pmu *pmu;
struct hrtimer hrtimer;
struct list_head list;
@@ -161,6 +164,33 @@ static ssize_t uncore_event_show(struct kobject *kobj,
return sprintf(buf, "%s", event->config);
}
+static inline unsigned uncore_pci_box_ctl(struct intel_uncore_box *box)
+{
+ return box->pmu->type->box_ctl;
+}
+
+static inline unsigned uncore_pci_fixed_ctl(struct intel_uncore_box *box)
+{
+ return box->pmu->type->fixed_ctl;
+}
+
+static inline unsigned uncore_pci_fixed_ctr(struct intel_uncore_box *box)
+{
+ return box->pmu->type->fixed_ctr;
+}
+
+static inline
+unsigned uncore_pci_event_ctl(struct intel_uncore_box *box, int idx)
+{
+ return idx * 4 + box->pmu->type->event_ctl;
+}
+
+static inline
+unsigned uncore_pci_perf_ctr(struct intel_uncore_box *box, int idx)
+{
+ return idx * 8 + box->pmu->type->perf_ctr;
+}
+
static inline
unsigned uncore_msr_box_ctl(struct intel_uncore_box *box)
{
@@ -200,6 +230,42 @@ unsigned uncore_msr_perf_ctr(struct intel_uncore_box *box, int idx)
box->pmu->type->msr_offset * box->pmu->pmu_idx;
}
+static inline
+unsigned uncore_fixed_ctl(struct intel_uncore_box *box)
+{
+ if (box->pci_dev)
+ return uncore_pci_fixed_ctl(box);
+ else
+ return uncore_msr_fixed_ctl(box);
+}
+
+static inline
+unsigned uncore_fixed_ctr(struct intel_uncore_box *box)
+{
+ if (box->pci_dev)
+ return uncore_pci_fixed_ctr(box);
+ else
+ return uncore_msr_fixed_ctr(box);
+}
+
+static inline
+unsigned uncore_event_ctl(struct intel_uncore_box *box, int idx)
+{
+ if (box->pci_dev)
+ return uncore_pci_event_ctl(box, idx);
+ else
+ return uncore_msr_event_ctl(box, idx);
+}
+
+static inline
+unsigned uncore_perf_ctr(struct intel_uncore_box *box, int idx)
+{
+ if (box->pci_dev)
+ return uncore_pci_perf_ctr(box, idx);
+ else
+ return uncore_msr_perf_ctr(box, idx);
+}
+
static inline int uncore_perf_ctr_bits(struct intel_uncore_box *box)
{
return box->pmu->type->perf_ctr_bits;
--
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