Re: [PATCH 4/5] perf/x86: Uncore filter support for SandyBridge-EP

From: Stephane Eranian
Date: Sun Jul 22 2012 - 15:25:24 EST

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On Wed, Jul 4, 2012 at 8:00 AM, Yan, Zheng <zheng.z.yan@xxxxxxxxx> wrote:
>
> From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>
>
> This patch adds C-Box and PCU filter support for SandyBridge-EP
> uncore. We can filter C-Box events by thread/core ID and filter
> PCU events by frequency/voltage.
>
> Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
> ---
> arch/x86/kernel/cpu/perf_event_intel_uncore.c | 228 ++++++++++++++++++++-----
> arch/x86/kernel/cpu/perf_event_intel_uncore.h | 24 ++-
> 2 files changed, 206 insertions(+), 46 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> index a394add..c0a80ff 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> @@ -14,10 +14,13 @@ static cpumask_t uncore_cpu_mask;
> /* constraint for the fixed counter */
> static struct event_constraint constraint_fixed =
> EVENT_CONSTRAINT(~0ULL, 1 << UNCORE_PMC_IDX_FIXED, ~0ULL);
> +static struct event_constraint constraint_empty =
> + EVENT_CONSTRAINT(0, 0, 0);
>
> DEFINE_UNCORE_FORMAT_ATTR(event, event, "config:0-7");
> DEFINE_UNCORE_FORMAT_ATTR(umask, umask, "config:8-15");
> DEFINE_UNCORE_FORMAT_ATTR(edge, edge, "config:18");
> +DEFINE_UNCORE_FORMAT_ATTR(tid_en, tid_en, "config:19");
> DEFINE_UNCORE_FORMAT_ATTR(inv, inv, "config:23");
> DEFINE_UNCORE_FORMAT_ATTR(cmask5, cmask, "config:24-28");
> DEFINE_UNCORE_FORMAT_ATTR(cmask8, cmask, "config:24-31");
> @@ -26,8 +29,19 @@ DEFINE_UNCORE_FORMAT_ATTR(thresh5, thresh, "config:24-28");
> DEFINE_UNCORE_FORMAT_ATTR(occ_sel, occ_sel, "config:14-15");
> DEFINE_UNCORE_FORMAT_ATTR(occ_invert, occ_invert, "config:30");
> DEFINE_UNCORE_FORMAT_ATTR(occ_edge, occ_edge, "config:14-51");
> +DEFINE_UNCORE_FORMAT_ATTR(filter_tid, filter_tid, "config1:0-4");
> +DEFINE_UNCORE_FORMAT_ATTR(filter_nid, filter_nid, "config1:10-17");
> +DEFINE_UNCORE_FORMAT_ATTR(filter_state, filter_state, "config1:18-22");
> +DEFINE_UNCORE_FORMAT_ATTR(filter_opc, filter_opc, "config1:23-31");
> +DEFINE_UNCORE_FORMAT_ATTR(filter_brand0, filter_brand0, "config1:0-7");
> +DEFINE_UNCORE_FORMAT_ATTR(filter_brand1, filter_brand1, "config1:8-15");
> +DEFINE_UNCORE_FORMAT_ATTR(filter_brand2, filter_brand2, "config1:16-23");
> +DEFINE_UNCORE_FORMAT_ATTR(filter_brand3, filter_brand3, "config1:24-31");
>
That's not filter_brand*, that's filter_band*.

> /* Sandy Bridge-EP uncore support */
> +static struct intel_uncore_type snbep_uncore_cbox;
> +static struct intel_uncore_type snbep_uncore_pcu;
> +
> static void snbep_uncore_pci_disable_box(struct intel_uncore_box *box)
> {
> struct pci_dev *pdev = box->pci_dev;
> @@ -120,6 +134,10 @@ static void snbep_uncore_msr_enable_event(struct intel_uncore_box *box,
> struct perf_event *event)
> {
> struct hw_perf_event *hwc = &event->hw;
> + struct hw_perf_event_extra *reg1 = &hwc->extra_reg;
> +
> + if (reg1->idx != EXTRA_REG_NONE)
> + wrmsrl(reg1->reg, reg1->config);
>
> wrmsrl(hwc->config_base, hwc->config | SNBEP_PMON_CTL_EN);
> }
> @@ -149,6 +167,71 @@ static void snbep_uncore_msr_init_box(struct intel_uncore_box *box)
> wrmsrl(msr, SNBEP_PMON_BOX_CTL_INT);
> }
>
> +static struct event_constraint *
> +snbep_uncore_get_constraint(struct intel_uncore_box *box,
> + struct perf_event *event)
> +{
> + struct intel_uncore_extra_reg *er;
> + struct hw_perf_event_extra *reg1 = &event->hw.extra_reg;
> + unsigned long flags;
> + bool ok = false;
> +
> + if (reg1->idx == EXTRA_REG_NONE || (box->phys_id >= 0 && reg1->alloc))
> + return NULL;
> +
> + er = &box->shared_regs[reg1->idx];
> + raw_spin_lock_irqsave(&er->lock, flags);
> + if (!atomic_read(&er->ref) || er->config1 == reg1->config) {
> + atomic_inc(&er->ref);
> + er->config1 = reg1->config;
> + ok = true;
> + }
> + raw_spin_unlock_irqrestore(&er->lock, flags);
> +
> + if (ok) {
> + if (box->phys_id >= 0)
> + reg1->alloc = 1;
> + return NULL;
> + }
> + return &constraint_empty;
> +}
> +
> +static void snbep_uncore_put_constraint(struct intel_uncore_box *box,
> + struct perf_event *event)
> +{
> + struct intel_uncore_extra_reg *er;
> + struct hw_perf_event_extra *reg1 = &event->hw.extra_reg;
> +
> + if (box->phys_id < 0 || !reg1->alloc)
> + return;
> +
> + er = &box->shared_regs[reg1->idx];
> + atomic_dec(&er->ref);
> + reg1->alloc = 0;
> +}
> +
> +static int snbep_uncore_hw_config(struct intel_uncore_box *box,
> + struct perf_event *event)
> +{
> + struct hw_perf_event *hwc = &event->hw;
> + struct hw_perf_event_extra *reg1 = &hwc->extra_reg;
> +
> + if (box->pmu->type == &snbep_uncore_cbox) {
> + reg1->reg = SNBEP_C0_MSR_PMON_BOX_FILTER +
> + SNBEP_CBO_MSR_OFFSET * box->pmu->pmu_idx;
> + reg1->config = event->attr.config1 &
> + SNBEP_CB0_MSR_PMON_BOX_FILTER_MASK;
> + } else if (box->pmu->type == &snbep_uncore_pcu) {
> + reg1->reg = SNBEP_PCU_MSR_PMON_BOX_FILTER;
> + reg1->config = event->attr.config1 &
> + SNBEP_PCU_MSR_PMON_BOX_FILTER_MASK;
> + } else {
> + return 0;
> + }
> + reg1->idx = 0;
> + return 0;
> +}
> +
> static struct attribute *snbep_uncore_formats_attr[] = {
> &format_attr_event.attr,
> &format_attr_umask.attr,
> @@ -167,6 +250,20 @@ static struct attribute *snbep_uncore_ubox_formats_attr[] = {
> NULL,
> };
>
> +static struct attribute *snbep_uncore_cbox_formats_attr[] = {
> + &format_attr_event.attr,
> + &format_attr_umask.attr,
> + &format_attr_edge.attr,
> + &format_attr_tid_en.attr,
> + &format_attr_inv.attr,
> + &format_attr_thresh8.attr,
> + &format_attr_filter_tid.attr,
> + &format_attr_filter_nid.attr,
> + &format_attr_filter_state.attr,
> + &format_attr_filter_opc.attr,
> + NULL,
> +};
> +
> static struct attribute *snbep_uncore_pcu_formats_attr[] = {
> &format_attr_event.attr,
> &format_attr_occ_sel.attr,
> @@ -175,6 +272,10 @@ static struct attribute *snbep_uncore_pcu_formats_attr[] = {
> &format_attr_thresh5.attr,
> &format_attr_occ_invert.attr,
> &format_attr_occ_edge.attr,
> + &format_attr_filter_brand0.attr,
> + &format_attr_filter_brand1.attr,
> + &format_attr_filter_brand2.attr,
> + &format_attr_filter_brand3.attr,
> NULL,
> };
>
> @@ -203,6 +304,11 @@ static struct attribute_group snbep_uncore_ubox_format_group = {
> .attrs = snbep_uncore_ubox_formats_attr,
> };
>
> +static struct attribute_group snbep_uncore_cbox_format_group = {
> + .name = "format",
> + .attrs = snbep_uncore_cbox_formats_attr,
> +};
> +
> static struct attribute_group snbep_uncore_pcu_format_group = {
> .name = "format",
> .attrs = snbep_uncore_pcu_formats_attr,
> @@ -215,6 +321,9 @@ static struct intel_uncore_ops snbep_uncore_msr_ops = {
> .disable_event = snbep_uncore_msr_disable_event,
> .enable_event = snbep_uncore_msr_enable_event,
> .read_counter = snbep_uncore_msr_read_counter,
> + .get_constraint = snbep_uncore_get_constraint,
> + .put_constraint = snbep_uncore_put_constraint,
> + .hw_config = snbep_uncore_hw_config,
> };
>
> static struct intel_uncore_ops snbep_uncore_pci_ops = {
> @@ -307,31 +416,33 @@ static struct intel_uncore_type snbep_uncore_ubox = {
> };
>
> static struct intel_uncore_type snbep_uncore_cbox = {
> - .name = "cbox",
> - .num_counters = 4,
> - .num_boxes = 8,
> - .perf_ctr_bits = 44,
> - .event_ctl = SNBEP_C0_MSR_PMON_CTL0,
> - .perf_ctr = SNBEP_C0_MSR_PMON_CTR0,
> - .event_mask = SNBEP_PMON_RAW_EVENT_MASK,
> - .box_ctl = SNBEP_C0_MSR_PMON_BOX_CTL,
> - .msr_offset = SNBEP_CBO_MSR_OFFSET,
> - .constraints = snbep_uncore_cbox_constraints,
> - .ops = &snbep_uncore_msr_ops,
> - .format_group = &snbep_uncore_format_group,
> + .name = "cbox",
> + .num_counters = 4,
> + .num_boxes = 8,
> + .perf_ctr_bits = 44,
> + .event_ctl = SNBEP_C0_MSR_PMON_CTL0,
> + .perf_ctr = SNBEP_C0_MSR_PMON_CTR0,
> + .event_mask = SNBEP_CBO_MSR_PMON_RAW_EVENT_MASK,
> + .box_ctl = SNBEP_C0_MSR_PMON_BOX_CTL,
> + .msr_offset = SNBEP_CBO_MSR_OFFSET,
> + .num_shared_regs = 1,
> + .constraints = snbep_uncore_cbox_constraints,
> + .ops = &snbep_uncore_msr_ops,
> + .format_group = &snbep_uncore_cbox_format_group,
> };
>
> static struct intel_uncore_type snbep_uncore_pcu = {
> - .name = "pcu",
> - .num_counters = 4,
> - .num_boxes = 1,
> - .perf_ctr_bits = 48,
> - .perf_ctr = SNBEP_PCU_MSR_PMON_CTR0,
> - .event_ctl = SNBEP_PCU_MSR_PMON_CTL0,
> - .event_mask = SNBEP_PCU_MSR_PMON_RAW_EVENT_MASK,
> - .box_ctl = SNBEP_PCU_MSR_PMON_BOX_CTL,
> - .ops = &snbep_uncore_msr_ops,
> - .format_group = &snbep_uncore_pcu_format_group,
> + .name = "pcu",
> + .num_counters = 4,
> + .num_boxes = 1,
> + .perf_ctr_bits = 48,
> + .perf_ctr = SNBEP_PCU_MSR_PMON_CTR0,
> + .event_ctl = SNBEP_PCU_MSR_PMON_CTL0,
> + .event_mask = SNBEP_PCU_MSR_PMON_RAW_EVENT_MASK,
> + .box_ctl = SNBEP_PCU_MSR_PMON_BOX_CTL,
> + .num_shared_regs = 1,
> + .ops = &snbep_uncore_msr_ops,
> + .format_group = &snbep_uncore_pcu_format_group,
> };
>
> static struct intel_uncore_type *snbep_msr_uncores[] = {
> @@ -747,15 +858,22 @@ static void uncore_pmu_init_hrtimer(struct intel_uncore_box *box)
> box->hrtimer.function = uncore_pmu_hrtimer;
> }
>
> -struct intel_uncore_box *uncore_alloc_box(int cpu)
> +struct intel_uncore_box *uncore_alloc_box(struct intel_uncore_type *type,
> + int cpu)
> {
> struct intel_uncore_box *box;
> + int i, size;
>
> - box = kmalloc_node(sizeof(*box), GFP_KERNEL | __GFP_ZERO,
> - cpu_to_node(cpu));
> + size = sizeof(*box) + type->num_shared_regs *
> + sizeof(struct intel_uncore_extra_reg);
> +
> + box = kmalloc_node(size, GFP_KERNEL | __GFP_ZERO, cpu_to_node(cpu));
> if (!box)
> return NULL;
>
> + for (i = 0; i < type->num_shared_regs; i++)
> + raw_spin_lock_init(&box->shared_regs[i].lock);
> +
> uncore_pmu_init_hrtimer(box);
> atomic_set(&box->refcnt, 1);
> box->cpu = -1;
> @@ -834,11 +952,18 @@ static int uncore_collect_events(struct intel_uncore_box *box,
> }
>
> static struct event_constraint *
> -uncore_event_constraint(struct intel_uncore_type *type,
> - struct perf_event *event)
> +uncore_get_event_constraint(struct intel_uncore_box *box,
> + struct perf_event *event)
> {
> + struct intel_uncore_type *type = box->pmu->type;
> struct event_constraint *c;
>
> + if (type->ops->get_constraint) {
> + c = type->ops->get_constraint(box, event);
> + if (c)
> + return c;
> + }
> +
> if (event->hw.config == ~0ULL)
> return &constraint_fixed;
>
> @@ -852,19 +977,25 @@ uncore_event_constraint(struct intel_uncore_type *type,
> return &type->unconstrainted;
> }
>
> +static void uncore_put_event_constraint(struct intel_uncore_box *box,
> + struct perf_event *event)
> +{
> + if (box->pmu->type->ops->put_constraint)
> + box->pmu->type->ops->put_constraint(box, event);
> +}
> +
> static int uncore_assign_events(struct intel_uncore_box *box,
> int assign[], int n)
> {
> unsigned long used_mask[BITS_TO_LONGS(UNCORE_PMC_IDX_MAX)];
> struct event_constraint *c, *constraints[UNCORE_PMC_IDX_MAX];
> - int i, ret, wmin, wmax;
> + int i, wmin, wmax, ret = 0;
> struct hw_perf_event *hwc;
>
> bitmap_zero(used_mask, UNCORE_PMC_IDX_MAX);
>
> for (i = 0, wmin = UNCORE_PMC_IDX_MAX, wmax = 0; i < n; i++) {
> - c = uncore_event_constraint(box->pmu->type,
> - box->event_list[i]);
> + c = uncore_get_event_constraint(box, box->event_list[i]);
> constraints[i] = c;
> wmin = min(wmin, c->weight);
> wmax = max(wmax, c->weight);
> @@ -888,13 +1019,17 @@ static int uncore_assign_events(struct intel_uncore_box *box,
> break;
>
> __set_bit(hwc->idx, used_mask);
> - assign[i] = hwc->idx;
> + if (assign)
> + assign[i] = hwc->idx;
> }
> - if (i == n)
> - return 0;
> -
> /* slow path */
> - ret = perf_assign_events(constraints, n, wmin, wmax, assign);
> + if (i != n)
> + ret = perf_assign_events(constraints, n, wmin, wmax, assign);
> +
> + if (!assign || ret) {
> + for (i = 0; i < n; i++)
> + uncore_put_event_constraint(box, box->event_list[i]);
> + }
> return ret ? -EINVAL : 0;
> }
>
> @@ -1021,6 +1156,8 @@ static void uncore_pmu_event_del(struct perf_event *event, int flags)
>
> for (i = 0; i < box->n_events; i++) {
> if (event == box->event_list[i]) {
> + uncore_put_event_constraint(box, event);
> +
> while (++i < box->n_events)
> box->event_list[i - 1] = box->event_list[i];
>
> @@ -1048,10 +1185,9 @@ static int uncore_validate_group(struct intel_uncore_pmu *pmu,
> {
> struct perf_event *leader = event->group_leader;
> struct intel_uncore_box *fake_box;
> - int assign[UNCORE_PMC_IDX_MAX];
> int ret = -EINVAL, n;
>
> - fake_box = uncore_alloc_box(smp_processor_id());
> + fake_box = uncore_alloc_box(pmu->type, smp_processor_id());
> if (!fake_box)
> return -ENOMEM;
>
> @@ -1073,7 +1209,7 @@ static int uncore_validate_group(struct intel_uncore_pmu *pmu,
>
> fake_box->n_events = n;
>
> - ret = uncore_assign_events(fake_box, assign, n);
> + ret = uncore_assign_events(fake_box, NULL, n);
> out:
> kfree(fake_box);
> return ret;
> @@ -1117,6 +1253,10 @@ int uncore_pmu_event_init(struct perf_event *event)
> return -EINVAL;
> event->cpu = box->cpu;
>
> + event->hw.idx = -1;
> + event->hw.last_tag = ~0ULL;
> + event->hw.extra_reg.idx = EXTRA_REG_NONE;
> +
> if (event->attr.config == UNCORE_FIXED_EVENT) {
> /* no fixed counter */
> if (!pmu->type->fixed_ctl)
> @@ -1130,11 +1270,13 @@ int uncore_pmu_event_init(struct perf_event *event)
> hwc->config = ~0ULL;
> } else {
> hwc->config = event->attr.config & pmu->type->event_mask;
> + if (pmu->type->ops->hw_config) {
> + ret = pmu->type->ops->hw_config(box, event);
> + if (ret)
> + return ret;
> + }
> }
>
> - event->hw.idx = -1;
> - event->hw.last_tag = ~0ULL;
> -
> if (event->group_leader != event)
> ret = uncore_validate_group(pmu, event);
> else
> @@ -1276,7 +1418,7 @@ static int __devinit uncore_pci_add(struct intel_uncore_type *type,
> if (phys_id < 0)
> return -ENODEV;
>
> - box = uncore_alloc_box(0);
> + box = uncore_alloc_box(type, 0);
> if (!box)
> return -ENOMEM;
>
> @@ -1458,7 +1600,7 @@ static int __cpuinit uncore_cpu_prepare(int cpu, int phys_id)
> if (pmu->func_id < 0)
> pmu->func_id = j;
>
> - box = uncore_alloc_box(cpu);
> + box = uncore_alloc_box(type, cpu);
> if (!box)
> return -ENOMEM;
>
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.h b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
> index 88498c7..b13e9ea 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.h
> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
> @@ -97,6 +97,10 @@
> SNBEP_PMON_CTL_INVERT | \
> SNBEP_U_MSR_PMON_CTL_TRESH_MASK)
>
> +#define SNBEP_CBO_PMON_CTL_TID_EN (1 << 19)
> +#define SNBEP_CBO_MSR_PMON_RAW_EVENT_MASK (SNBEP_PMON_RAW_EVENT_MASK | \
> + SNBEP_CBO_PMON_CTL_TID_EN)
> +
> /* SNB-EP PCU event control */
> #define SNBEP_PCU_MSR_PMON_CTL_OCC_SEL_MASK 0x0000c000
> #define SNBEP_PCU_MSR_PMON_CTL_TRESH_MASK 0x1f000000
> @@ -140,15 +144,17 @@
> /* SNB-EP Cbo register */
> #define SNBEP_C0_MSR_PMON_CTR0 0xd16
> #define SNBEP_C0_MSR_PMON_CTL0 0xd10
> -#define SNBEP_C0_MSR_PMON_BOX_FILTER 0xd14
> #define SNBEP_C0_MSR_PMON_BOX_CTL 0xd04
> +#define SNBEP_C0_MSR_PMON_BOX_FILTER 0xd14
> +#define SNBEP_CB0_MSR_PMON_BOX_FILTER_MASK 0xfffffc1f
> #define SNBEP_CBO_MSR_OFFSET 0x20
>
> /* SNB-EP PCU register */
> #define SNBEP_PCU_MSR_PMON_CTR0 0xc36
> #define SNBEP_PCU_MSR_PMON_CTL0 0xc30
> -#define SNBEP_PCU_MSR_PMON_BOX_FILTER 0xc34
> #define SNBEP_PCU_MSR_PMON_BOX_CTL 0xc24
> +#define SNBEP_PCU_MSR_PMON_BOX_FILTER 0xc34
> +#define SNBEP_PCU_MSR_PMON_BOX_FILTER_MASK 0xffffffff
> #define SNBEP_PCU_MSR_CORE_C3_CTR 0x3fc
> #define SNBEP_PCU_MSR_CORE_C6_CTR 0x3fd
>
> @@ -163,7 +169,6 @@ struct intel_uncore_type {
> int num_boxes;
> int perf_ctr_bits;
> int fixed_ctr_bits;
> - int single_fixed;
> unsigned perf_ctr;
> unsigned event_ctl;
> unsigned event_mask;
> @@ -171,6 +176,8 @@ struct intel_uncore_type {
> unsigned fixed_ctl;
> unsigned box_ctl;
> unsigned msr_offset;
> + unsigned num_shared_regs:8;
> + unsigned single_fixed:1;
> struct event_constraint unconstrainted;
> struct event_constraint *constraints;
> struct intel_uncore_pmu *pmus;
> @@ -188,6 +195,10 @@ struct intel_uncore_ops {
> void (*disable_event)(struct intel_uncore_box *, struct perf_event *);
> void (*enable_event)(struct intel_uncore_box *, struct perf_event *);
> u64 (*read_counter)(struct intel_uncore_box *, struct perf_event *);
> + int (*hw_config)(struct intel_uncore_box *, struct perf_event *);
> + struct event_constraint *(*get_constraint)(struct intel_uncore_box *,
> + struct perf_event *);
> + void (*put_constraint)(struct intel_uncore_box *, struct perf_event *);
> };
>
> struct intel_uncore_pmu {
> @@ -200,6 +211,12 @@ struct intel_uncore_pmu {
> struct list_head box_list;
> };
>
> +struct intel_uncore_extra_reg {
> + raw_spinlock_t lock;
> + u64 config1;
> + atomic_t ref;
> +};
> +
> struct intel_uncore_box {
> int phys_id;
> int n_active; /* number of active events */
> @@ -215,6 +232,7 @@ struct intel_uncore_box {
> struct intel_uncore_pmu *pmu;
> struct hrtimer hrtimer;
> struct list_head list;
> + struct intel_uncore_extra_reg shared_regs[0];
> };
>
> #define UNCORE_BOX_FLAG_INITIATED 0
> --
> 1.7.10.4
>
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