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Subject[PATCH 5/6] perf: Generic pci uncore device support
Date
From: "Yan, Zheng" <zheng.z.yan@intel.com>

This patch adds generic support for uncore pmu presented as
pci device.

Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
---
arch/x86/kernel/cpu/perf_event_intel_uncore.c | 157 ++++++++++++++++++++++++-
arch/x86/kernel/cpu/perf_event_intel_uncore.h | 29 +++++
2 files changed, 182 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index 697c45f..42fa770 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -2,6 +2,12 @@

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;
+static struct pci_driver *uncore_pci_driver;
+static bool pcidrv_registered;
+
+/* pci bus to socket mapping */
+static int pcibus_to_phyid[256] = { [0 ... 255] = -1, };

/* constraint for box with 2 counters */
static struct event_constraint unconstrained_2 =
@@ -272,13 +278,23 @@ 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);
+ if (box->pci_dev) {
+ hwc->event_base = uncore_pci_fixed_ctr(box);
+ hwc->config_base = uncore_pci_fixed_ctl(box);
+ } else {
+ hwc->event_base = uncore_msr_fixed_ctr(box);
+ hwc->config_base = uncore_msr_fixed_ctl(box);
+ }
return;
}

- hwc->config_base = uncore_msr_event_ctl(box, hwc->idx);
- hwc->event_base = uncore_msr_perf_ctr(box, hwc->idx);
+ if (box->pci_dev) {
+ hwc->config_base = uncore_pci_event_ctl(box, hwc->idx);
+ hwc->event_base = uncore_pci_perf_ctr(box, hwc->idx);
+ } else {
+ hwc->config_base = uncore_msr_event_ctl(box, hwc->idx);
+ hwc->event_base = uncore_msr_perf_ctr(box, hwc->idx);
+ }
}

static void __uncore_perf_event_update(struct intel_uncore_box *box,
@@ -786,6 +802,14 @@ static void __init uncore_type_exit(struct intel_uncore_type *type)
type->pmus = 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;
@@ -849,6 +873,119 @@ static int __init uncore_types_init(struct intel_uncore_type **types)
return ret;
}

+/*
+ * 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 phyid, i, ret = 0;
+
+ phyid = pcibus_to_phyid[pdev->bus->number];
+ if (phyid < 0)
+ return -ENODEV;
+
+ box = alloc_uncore_box(0);
+ if (!box)
+ return -ENOMEM;
+
+ spin_lock(&uncore_box_lock);
+ /*
+ * 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) {
+ box->phy_id = phyid;
+ box->pci_dev = pdev;
+ box->pmu = pmu;
+ uncore_box_init(box);
+ pci_set_drvdata(pdev, box);
+ uncore_pmu_add_box(pmu, box);
+ } else {
+ ret = -EINVAL;
+ }
+ spin_unlock(&uncore_box_lock);
+ if (ret)
+ kfree(box);
+ return ret;
+}
+
+static void __devexit uncore_pci_remove(struct pci_dev *pdev)
+{
+ struct intel_uncore_box *box = pci_get_drvdata(pdev);
+ int phyid = pcibus_to_phyid[pdev->bus->number];
+ int free_it = 0;
+
+ if (WARN_ON_ONCE(phyid != box->phy_id))
+ return;
+
+ box->pci_dev = NULL;
+ spin_lock(&uncore_box_lock);
+ if (--box->refcnt == 0) {
+ hlist_del_rcu(&box->hlist);
+ free_it = 1;
+ }
+ spin_unlock(&uncore_box_lock);
+ if (free_it)
+ kfree_rcu(box, rcu_head);
+}
+
+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 uncore_cpu_dying(int cpu)
{
struct intel_uncore_type *type;
@@ -1021,6 +1158,14 @@ 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;
}

@@ -1031,8 +1176,12 @@ static int __init intel_uncore_init(void)
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return -ENODEV;

+ ret = uncore_pci_init();
+ if (ret)
+ goto fail;
ret = uncore_cpu_init();
if (ret) {
+ uncore_pci_exit();
goto fail;
}

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.h b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
index 41befe1..6d8cd79 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"

@@ -122,6 +123,7 @@ 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 rcu_head rcu_head;
@@ -161,6 +163,33 @@ 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)
{
--
1.7.7.6


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