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perf: Add driver for Arm NI-700 interconnect PMU

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The Arm NI-700 Network-on-Chip Interconnect has a relatively
straightforward design with a hierarchy of voltage, power, and clock
domains, where each clock domain then contains a number of interface
units and a PMU which can monitor events thereon. As such, it begets a
relatively straightforward driver to interface those PMUs with perf.

Even more so than with arm-cmn, users will require detailed knowledge of
the wider system topology in order to meaningfully analyse anything,
since the interconnect itself cannot know what lies beyond the boundary
of each inscrutably-numbered interface. Given that, for now they are
also expected to refer to the NI-700 documentation for the relevant
event IDs to provide as well. An identifier is implemented so we can
come back and add jevents if anyone really wants to.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/9933058d0ab8138c78a61cd6852ea5d5ff48e393.1725470837.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy 2024-09-04 18:34:03 +01:00 committed by Will Deacon
parent abbe74dd10
commit 4d5a7680f2
5 changed files with 807 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

17
Documentation/admin-guide/perf/arm-ni.rst Normal file
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@ -0,0 +1,17 @@
====================================
Arm Network-on Chip Interconnect PMU
====================================
NI-700 and friends implement a distinct PMU for each clock domain within the
interconnect. Correspondingly, the driver exposes multiple PMU devices named
arm_ni_<x>_cd_<y>, where <x> is an (arbitrary) instance identifier and <y> is
the clock domain ID within that particular instance. If multiple NI instances
exist within a system, the PMU devices can be correlated with the underlying
hardware instance via sysfs parentage.
Each PMU exposes base event aliases for the interface types present in its clock
domain. These require qualifying with the "eventid" and "nodeid" parameters
to specify the event code to count and the interface at which to count it
(per the configured hardware ID as reflected in the xxNI_NODE_INFO register).
The exception is the "cycles" alias for the PMU cycle counter, which is encoded
with the PMU node type and needs no further qualification.

1
Documentation/admin-guide/perf/index.rst
View file

@ -16,6 +16,7 @@ Performance monitor support
starfive_starlink_pmu starfive_starlink_pmu
arm-ccn arm-ccn
arm-cmn arm-cmn
arm-ni
xgene-pmu xgene-pmu
arm_dsu_pmu arm_dsu_pmu
thunderx2-pmu thunderx2-pmu

7
drivers/perf/Kconfig
View file

@ -48,6 +48,13 @@ config ARM_CMN
Support for PMU events monitoring on the Arm CMN-600 Coherent Mesh Support for PMU events monitoring on the Arm CMN-600 Coherent Mesh
Network interconnect. Network interconnect.
config ARM_NI
tristate "Arm NI-700 PMU support"
depends on ARM64 || COMPILE_TEST
help
Support for PMU events monitoring on the Arm NI-700 Network-on-Chip
interconnect and family.
config ARM_PMU config ARM_PMU
depends on ARM || ARM64 depends on ARM || ARM64
bool "ARM PMU framework" bool "ARM PMU framework"

1
drivers/perf/Makefile
View file

@ -3,6 +3,7 @@ obj-$(CONFIG_ARM_CCI_PMU) += arm-cci.o
obj-$(CONFIG_ARM_CCN) += arm-ccn.o obj-$(CONFIG_ARM_CCN) += arm-ccn.o
obj-$(CONFIG_ARM_CMN) += arm-cmn.o obj-$(CONFIG_ARM_CMN) += arm-cmn.o
obj-$(CONFIG_ARM_DSU_PMU) += arm_dsu_pmu.o obj-$(CONFIG_ARM_DSU_PMU) += arm_dsu_pmu.o
obj-$(CONFIG_ARM_NI) += arm-ni.o
obj-$(CONFIG_ARM_PMU) += arm_pmu.o arm_pmu_platform.o obj-$(CONFIG_ARM_PMU) += arm_pmu.o arm_pmu_platform.o
obj-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o obj-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o
obj-$(CONFIG_ARM_PMUV3) += arm_pmuv3.o obj-$(CONFIG_ARM_PMUV3) += arm_pmuv3.o

781
drivers/perf/arm-ni.c Normal file
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@ -0,0 +1,781 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2022-2024 Arm Limited
// NI-700 Network-on-Chip PMU driver
#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
/* Common registers */
#define NI_NODE_TYPE 0x000
#define NI_NODE_TYPE_NODE_ID GENMASK(31, 16)
#define NI_NODE_TYPE_NODE_TYPE GENMASK(15, 0)
#define NI_CHILD_NODE_INFO 0x004
#define NI_CHILD_PTR(n) (0x008 + (n) * 4)
#define NI700_PMUSELA 0x00c
/* Config node */
#define NI_PERIPHERAL_ID0 0xfe0
#define NI_PIDR0_PART_7_0 GENMASK(7, 0)
#define NI_PERIPHERAL_ID1 0xfe4
#define NI_PIDR1_PART_11_8 GENMASK(3, 0)
#define NI_PERIPHERAL_ID2 0xfe8
#define NI_PIDR2_VERSION GENMASK(7, 4)
/* PMU node */
#define NI_PMEVCNTR(n) (0x008 + (n) * 8)
#define NI_PMCCNTR_L 0x0f8
#define NI_PMCCNTR_U 0x0fc
#define NI_PMEVTYPER(n) (0x400 + (n) * 4)
#define NI_PMEVTYPER_NODE_TYPE GENMASK(12, 9)
#define NI_PMEVTYPER_NODE_ID GENMASK(8, 0)
#define NI_PMCNTENSET 0xc00
#define NI_PMCNTENCLR 0xc20
#define NI_PMINTENSET 0xc40
#define NI_PMINTENCLR 0xc60
#define NI_PMOVSCLR 0xc80
#define NI_PMOVSSET 0xcc0
#define NI_PMCFGR 0xe00
#define NI_PMCR 0xe04
#define NI_PMCR_RESET_CCNT BIT(2)
#define NI_PMCR_RESET_EVCNT BIT(1)
#define NI_PMCR_ENABLE BIT(0)
#define NI_NUM_COUNTERS 8
#define NI_CCNT_IDX 31
/* Event attributes */
#define NI_CONFIG_TYPE GENMASK_ULL(15, 0)
#define NI_CONFIG_NODEID GENMASK_ULL(31, 16)
#define NI_CONFIG_EVENTID GENMASK_ULL(47, 32)
#define NI_EVENT_TYPE(event) FIELD_GET(NI_CONFIG_TYPE, (event)->attr.config)
#define NI_EVENT_NODEID(event) FIELD_GET(NI_CONFIG_NODEID, (event)->attr.config)
#define NI_EVENT_EVENTID(event) FIELD_GET(NI_CONFIG_EVENTID, (event)->attr.config)
enum ni_part {
PART_NI_700 = 0x43b,
PART_NI_710AE = 0x43d,
};
enum ni_node_type {
NI_GLOBAL,
NI_VOLTAGE,
NI_POWER,
NI_CLOCK,
NI_ASNI,
NI_AMNI,
NI_PMU,
NI_HSNI,
NI_HMNI,
NI_PMNI,
};
struct arm_ni_node {
void __iomem *base;
enum ni_node_type type;
u16 id;
u32 num_components;
};
struct arm_ni_unit {
void __iomem *pmusela;
enum ni_node_type type;
u16 id;
bool ns;
union {
__le64 pmusel;
u8 event[8];
};
};
struct arm_ni_cd {
void __iomem *pmu_base;
u16 id;
int num_units;
int irq;
int cpu;
struct hlist_node cpuhp_node;
struct pmu pmu;
struct arm_ni_unit *units;
struct perf_event *evcnt[NI_NUM_COUNTERS];
struct perf_event *ccnt;
};
struct arm_ni {
struct device *dev;
void __iomem *base;
enum ni_part part;
int id;
int num_cds;
struct arm_ni_cd cds[] __counted_by(num_cds);
};
#define cd_to_ni(cd) container_of((cd), struct arm_ni, cds[(cd)->id])
#define pmu_to_cd(p) container_of((p), struct arm_ni_cd, pmu)
#define cd_for_each_unit(cd, u) \
for (struct arm_ni_unit *u = cd->units; u < cd->units + cd->num_units; u++)
static int arm_ni_hp_state;
struct arm_ni_event_attr {
struct device_attribute attr;
enum ni_node_type type;
};
#define NI_EVENT_ATTR(_name, _type) \
(&((struct arm_ni_event_attr[]) {{ \
.attr = __ATTR(_name, 0444, arm_ni_event_show, NULL), \
.type = _type, \
}})[0].attr.attr)
static ssize_t arm_ni_event_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct arm_ni_event_attr *eattr = container_of(attr, typeof(*eattr), attr);
if (eattr->type == NI_PMU)
return sysfs_emit(buf, "type=0x%x\n", eattr->type);
return sysfs_emit(buf, "type=0x%x,eventid=?,nodeid=?\n", eattr->type);
}
static umode_t arm_ni_event_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int unused)
{
struct device *dev = kobj_to_dev(kobj);
struct arm_ni_cd *cd = pmu_to_cd(dev_get_drvdata(dev));
struct arm_ni_event_attr *eattr;
eattr = container_of(attr, typeof(*eattr), attr.attr);
cd_for_each_unit(cd, unit) {
if (unit->type == eattr->type && unit->ns)
return attr->mode;
}
return 0;
}
static struct attribute *arm_ni_event_attrs[] = {
NI_EVENT_ATTR(asni, NI_ASNI),
NI_EVENT_ATTR(amni, NI_AMNI),
NI_EVENT_ATTR(cycles, NI_PMU),
NI_EVENT_ATTR(hsni, NI_HSNI),
NI_EVENT_ATTR(hmni, NI_HMNI),
NI_EVENT_ATTR(pmni, NI_PMNI),
NULL
};
static const struct attribute_group arm_ni_event_attrs_group = {
.name = "events",
.attrs = arm_ni_event_attrs,
.is_visible = arm_ni_event_attr_is_visible,
};
struct arm_ni_format_attr {
struct device_attribute attr;
u64 field;
};
#define NI_FORMAT_ATTR(_name, _fld) \
(&((struct arm_ni_format_attr[]) {{ \
.attr = __ATTR(_name, 0444, arm_ni_format_show, NULL), \
.field = _fld, \
}})[0].attr.attr)
static ssize_t arm_ni_format_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct arm_ni_format_attr *fmt = container_of(attr, typeof(*fmt), attr);
return sysfs_emit(buf, "config:%*pbl\n", 64, &fmt->field);
}
static struct attribute *arm_ni_format_attrs[] = {
NI_FORMAT_ATTR(type, NI_CONFIG_TYPE),
NI_FORMAT_ATTR(nodeid, NI_CONFIG_NODEID),
NI_FORMAT_ATTR(eventid, NI_CONFIG_EVENTID),
NULL
};
static const struct attribute_group arm_ni_format_attrs_group = {
.name = "format",
.attrs = arm_ni_format_attrs,
};
static ssize_t arm_ni_cpumask_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct arm_ni_cd *cd = pmu_to_cd(dev_get_drvdata(dev));
return cpumap_print_to_pagebuf(true, buf, cpumask_of(cd->cpu));
}
static struct device_attribute arm_ni_cpumask_attr =
__ATTR(cpumask, 0444, arm_ni_cpumask_show, NULL);
static ssize_t arm_ni_identifier_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct arm_ni *ni = cd_to_ni(pmu_to_cd(dev_get_drvdata(dev)));
u32 reg = readl_relaxed(ni->base + NI_PERIPHERAL_ID2);
int version = FIELD_GET(NI_PIDR2_VERSION, reg);
return sysfs_emit(buf, "%03x%02x\n", ni->part, version);
}
static struct device_attribute arm_ni_identifier_attr =
__ATTR(identifier, 0444, arm_ni_identifier_show, NULL);
static struct attribute *arm_ni_other_attrs[] = {
&arm_ni_cpumask_attr.attr,
&arm_ni_identifier_attr.attr,
NULL
};
static const struct attribute_group arm_ni_other_attr_group = {
.attrs = arm_ni_other_attrs,
NULL
};
static const struct attribute_group *arm_ni_attr_groups[] = {
&arm_ni_event_attrs_group,
&arm_ni_format_attrs_group,
&arm_ni_other_attr_group,
NULL
};
static void arm_ni_pmu_enable(struct pmu *pmu)
{
writel_relaxed(NI_PMCR_ENABLE, pmu_to_cd(pmu)->pmu_base + NI_PMCR);
}
static void arm_ni_pmu_disable(struct pmu *pmu)
{
writel_relaxed(0, pmu_to_cd(pmu)->pmu_base + NI_PMCR);
}
struct arm_ni_val {
unsigned int evcnt;
unsigned int ccnt;
};
static bool arm_ni_val_count_event(struct perf_event *evt, struct arm_ni_val *val)
{
if (is_software_event(evt))
return true;
if (NI_EVENT_TYPE(evt) == NI_PMU) {
val->ccnt++;
return val->ccnt <= 1;
}
val->evcnt++;
return val->evcnt <= NI_NUM_COUNTERS;
}
static int arm_ni_validate_group(struct perf_event *event)
{
struct perf_event *sibling, *leader = event->group_leader;
struct arm_ni_val val = { 0 };
if (leader == event)
return 0;
arm_ni_val_count_event(event, &val);
if (!arm_ni_val_count_event(leader, &val))
return -EINVAL;
for_each_sibling_event(sibling, leader) {
if (!arm_ni_val_count_event(sibling, &val))
return -EINVAL;
}
return 0;
}
static int arm_ni_event_init(struct perf_event *event)
{
struct arm_ni_cd *cd = pmu_to_cd(event->pmu);
if (event->attr.type != event->pmu->type)
return -ENOENT;
if (is_sampling_event(event))
return -EINVAL;
event->cpu = cd->cpu;
if (NI_EVENT_TYPE(event) == NI_PMU)
return arm_ni_validate_group(event);
cd_for_each_unit(cd, unit) {
if (unit->type == NI_EVENT_TYPE(event) &&
unit->id == NI_EVENT_NODEID(event) && unit->ns) {
event->hw.config_base = (unsigned long)unit;
return arm_ni_validate_group(event);
}
}
return -EINVAL;
}
static u64 arm_ni_read_ccnt(struct arm_ni_cd *cd)
{
u64 l, u_old, u_new;
int retries = 3; /* 1st time unlucky, 2nd improbable, 3rd just broken */
u_new = readl_relaxed(cd->pmu_base + NI_PMCCNTR_U);
do {
u_old = u_new;
l = readl_relaxed(cd->pmu_base + NI_PMCCNTR_L);
u_new = readl_relaxed(cd->pmu_base + NI_PMCCNTR_U);
} while (u_new != u_old && --retries);
WARN_ON(!retries);
return (u_new << 32) | l;
}
static void arm_ni_event_read(struct perf_event *event)
{
struct arm_ni_cd *cd = pmu_to_cd(event->pmu);
struct hw_perf_event *hw = &event->hw;
u64 count, prev;
bool ccnt = hw->idx == NI_CCNT_IDX;
do {
prev = local64_read(&hw->prev_count);
if (ccnt)
count = arm_ni_read_ccnt(cd);
else
count = readl_relaxed(cd->pmu_base + NI_PMEVCNTR(hw->idx));
} while (local64_cmpxchg(&hw->prev_count, prev, count) != prev);
count -= prev;
if (!ccnt)
count = (u32)count;
local64_add(count, &event->count);
}
static void arm_ni_event_start(struct perf_event *event, int flags)
{
struct arm_ni_cd *cd = pmu_to_cd(event->pmu);
writel_relaxed(1U << event->hw.idx, cd->pmu_base + NI_PMCNTENSET);
}
static void arm_ni_event_stop(struct perf_event *event, int flags)
{
struct arm_ni_cd *cd = pmu_to_cd(event->pmu);
writel_relaxed(1U << event->hw.idx, cd->pmu_base + NI_PMCNTENCLR);
if (flags & PERF_EF_UPDATE)
arm_ni_event_read(event);
}
static void arm_ni_init_ccnt(struct arm_ni_cd *cd)
{
local64_set(&cd->ccnt->hw.prev_count, S64_MIN);
lo_hi_writeq_relaxed(S64_MIN, cd->pmu_base + NI_PMCCNTR_L);
}
static void arm_ni_init_evcnt(struct arm_ni_cd *cd, int idx)
{
local64_set(&cd->evcnt[idx]->hw.prev_count, S32_MIN);
writel_relaxed(S32_MIN, cd->pmu_base + NI_PMEVCNTR(idx));
}
static int arm_ni_event_add(struct perf_event *event, int flags)
{
struct arm_ni_cd *cd = pmu_to_cd(event->pmu);
struct hw_perf_event *hw = &event->hw;
struct arm_ni_unit *unit;
enum ni_node_type type = NI_EVENT_TYPE(event);
u32 reg;
if (type == NI_PMU) {
if (cd->ccnt)
return -ENOSPC;
hw->idx = NI_CCNT_IDX;
cd->ccnt = event;
arm_ni_init_ccnt(cd);
} else {
hw->idx = 0;
while (cd->evcnt[hw->idx]) {
if (++hw->idx == NI_NUM_COUNTERS)
return -ENOSPC;
}
cd->evcnt[hw->idx] = event;
unit = (void *)hw->config_base;
unit->event[hw->idx] = NI_EVENT_EVENTID(event);
arm_ni_init_evcnt(cd, hw->idx);
lo_hi_writeq_relaxed(le64_to_cpu(unit->pmusel), unit->pmusela);
reg = FIELD_PREP(NI_PMEVTYPER_NODE_TYPE, type) |
FIELD_PREP(NI_PMEVTYPER_NODE_ID, NI_EVENT_NODEID(event));
writel_relaxed(reg, cd->pmu_base + NI_PMEVTYPER(hw->idx));
}
if (flags & PERF_EF_START)
arm_ni_event_start(event, 0);
return 0;
}
static void arm_ni_event_del(struct perf_event *event, int flags)
{
struct arm_ni_cd *cd = pmu_to_cd(event->pmu);
struct hw_perf_event *hw = &event->hw;
arm_ni_event_stop(event, PERF_EF_UPDATE);
if (hw->idx == NI_CCNT_IDX)
cd->ccnt = NULL;
else
cd->evcnt[hw->idx] = NULL;
}
static irqreturn_t arm_ni_handle_irq(int irq, void *dev_id)
{
struct arm_ni_cd *cd = dev_id;
irqreturn_t ret = IRQ_NONE;
u32 reg = readl_relaxed(cd->pmu_base + NI_PMOVSCLR);
if (reg & (1U << NI_CCNT_IDX)) {
ret = IRQ_HANDLED;
if (!(WARN_ON(!cd->ccnt))) {
arm_ni_event_read(cd->ccnt);
arm_ni_init_ccnt(cd);
}
}
for (int i = 0; i < NI_NUM_COUNTERS; i++) {
if (!(reg & (1U << i)))
continue;
ret = IRQ_HANDLED;
if (!(WARN_ON(!cd->evcnt[i]))) {
arm_ni_event_read(cd->evcnt[i]);
arm_ni_init_evcnt(cd, i);
}
}
writel_relaxed(reg, cd->pmu_base + NI_PMOVSCLR);
return ret;
}
static int arm_ni_init_cd(struct arm_ni *ni, struct arm_ni_node *node, u64 res_start)
{
struct arm_ni_cd *cd = ni->cds + node->id;
const char *name;
int err;
cd->id = node->id;
cd->num_units = node->num_components;
cd->units = devm_kcalloc(ni->dev, cd->num_units, sizeof(*(cd->units)), GFP_KERNEL);
if (!cd->units)
return -ENOMEM;
for (int i = 0; i < cd->num_units; i++) {
u32 reg = readl_relaxed(node->base + NI_CHILD_PTR(i));
void __iomem *unit_base = ni->base + reg;
struct arm_ni_unit *unit = cd->units + i;
reg = readl_relaxed(unit_base + NI_NODE_TYPE);
unit->type = FIELD_GET(NI_NODE_TYPE_NODE_TYPE, reg);
unit->id = FIELD_GET(NI_NODE_TYPE_NODE_ID, reg);
switch (unit->type) {
case NI_PMU:
reg = readl_relaxed(unit_base + NI_PMCFGR);
if (!reg) {
dev_info(ni->dev, "No access to PMU %d\n", cd->id);
devm_kfree(ni->dev, cd->units);
return 0;
}
unit->ns = true;
cd->pmu_base = unit_base;
break;
case NI_ASNI:
case NI_AMNI:
case NI_HSNI:
case NI_HMNI:
case NI_PMNI:
unit->pmusela = unit_base + NI700_PMUSELA;
writel_relaxed(1, unit->pmusela);
if (readl_relaxed(unit->pmusela) != 1)
dev_info(ni->dev, "No access to node 0x%04x%04x\n", unit->id, unit->type);
else
unit->ns = true;
break;
default:
/*
* e.g. FMU - thankfully bits 3:2 of FMU_ERR_FR0 are RES0 so
* can't alias any of the leaf node types we're looking for.
*/
dev_dbg(ni->dev, "Mystery node 0x%04x%04x\n", unit->id, unit->type);
break;
}
}
res_start += cd->pmu_base - ni->base;
if (!devm_request_mem_region(ni->dev, res_start, SZ_4K, dev_name(ni->dev))) {
dev_err(ni->dev, "Failed to request PMU region 0x%llx\n", res_start);
return -EBUSY;
}
writel_relaxed(NI_PMCR_RESET_CCNT | NI_PMCR_RESET_EVCNT,
cd->pmu_base + NI_PMCR);
writel_relaxed(U32_MAX, cd->pmu_base + NI_PMCNTENCLR);
writel_relaxed(U32_MAX, cd->pmu_base + NI_PMOVSCLR);
writel_relaxed(U32_MAX, cd->pmu_base + NI_PMINTENSET);
cd->irq = platform_get_irq(to_platform_device(ni->dev), cd->id);
if (cd->irq < 0)
return cd->irq;
err = devm_request_irq(ni->dev, cd->irq, arm_ni_handle_irq,
IRQF_NOBALANCING | IRQF_NO_THREAD,
dev_name(ni->dev), cd);
if (err)
return err;
cd->cpu = cpumask_local_spread(0, dev_to_node(ni->dev));
cd->pmu = (struct pmu) {
.module = THIS_MODULE,
.parent = ni->dev,
.attr_groups = arm_ni_attr_groups,
.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
.task_ctx_nr = perf_invalid_context,
.pmu_enable = arm_ni_pmu_enable,
.pmu_disable = arm_ni_pmu_disable,
.event_init = arm_ni_event_init,
.add = arm_ni_event_add,
.del = arm_ni_event_del,
.start = arm_ni_event_start,
.stop = arm_ni_event_stop,
.read = arm_ni_event_read,
};
name = devm_kasprintf(ni->dev, GFP_KERNEL, "arm_ni_%d_cd_%d", ni->id, cd->id);
if (!name)
return -ENOMEM;
err = cpuhp_state_add_instance_nocalls(arm_ni_hp_state, &cd->cpuhp_node);
if (err)
return err;
err = perf_pmu_register(&cd->pmu, name, -1);
if (err)
cpuhp_state_remove_instance_nocalls(arm_ni_hp_state, &cd->cpuhp_node);
return err;
}
static void arm_ni_probe_domain(void __iomem *base, struct arm_ni_node *node)
{
u32 reg = readl_relaxed(base + NI_NODE_TYPE);
node->base = base;
node->type = FIELD_GET(NI_NODE_TYPE_NODE_TYPE, reg);
node->id = FIELD_GET(NI_NODE_TYPE_NODE_ID, reg);
node->num_components = readl_relaxed(base + NI_CHILD_NODE_INFO);
}
static int arm_ni_probe(struct platform_device *pdev)
{
struct arm_ni_node cfg, vd, pd, cd;
struct arm_ni *ni;
struct resource *res;
void __iomem *base;
static atomic_t id;
int num_cds;
u32 reg, part;
/*
* We want to map the whole configuration space for ease of discovery,
* but the PMU pages are the only ones for which we can honestly claim
* exclusive ownership, so we'll request them explicitly once found.
*/
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (IS_ERR(base))
return PTR_ERR(base);
arm_ni_probe_domain(base, &cfg);
if (cfg.type != NI_GLOBAL)
return -ENODEV;
reg = readl_relaxed(cfg.base + NI_PERIPHERAL_ID0);
part = FIELD_GET(NI_PIDR0_PART_7_0, reg);
reg = readl_relaxed(cfg.base + NI_PERIPHERAL_ID1);
part |= FIELD_GET(NI_PIDR1_PART_11_8, reg) << 8;
switch (part) {
case PART_NI_700:
case PART_NI_710AE:
break;
default:
dev_WARN(&pdev->dev, "Unknown part number: 0x%03x, this may go badly\n", part);
break;
}
num_cds = 0;
for (int v = 0; v < cfg.num_components; v++) {
reg = readl_relaxed(cfg.base + NI_CHILD_PTR(v));
arm_ni_probe_domain(base + reg, &vd);
for (int p = 0; p < vd.num_components; p++) {
reg = readl_relaxed(vd.base + NI_CHILD_PTR(p));
arm_ni_probe_domain(base + reg, &pd);
num_cds += pd.num_components;
}
}
ni = devm_kzalloc(&pdev->dev, struct_size(ni, cds, num_cds), GFP_KERNEL);
if (!ni)
return -ENOMEM;
ni->dev = &pdev->dev;
ni->base = base;
ni->num_cds = num_cds;
ni->part = part;
ni->id = atomic_fetch_inc(&id);
for (int v = 0; v < cfg.num_components; v++) {
reg = readl_relaxed(cfg.base + NI_CHILD_PTR(v));
arm_ni_probe_domain(base + reg, &vd);
for (int p = 0; p < vd.num_components; p++) {
reg = readl_relaxed(vd.base + NI_CHILD_PTR(p));
arm_ni_probe_domain(base + reg, &pd);
for (int c = 0; c < pd.num_components; c++) {
int ret;
reg = readl_relaxed(pd.base + NI_CHILD_PTR(c));
arm_ni_probe_domain(base + reg, &cd);
ret = arm_ni_init_cd(ni, &cd, res->start);
if (ret)
return ret;
}
}
}
return 0;
}
static void arm_ni_remove(struct platform_device *pdev)
{
struct arm_ni *ni = platform_get_drvdata(pdev);
for (int i = 0; i < ni->num_cds; i++) {
struct arm_ni_cd *cd = ni->cds + i;
if (!cd->pmu_base)
continue;
writel_relaxed(0, cd->pmu_base + NI_PMCR);
writel_relaxed(U32_MAX, cd->pmu_base + NI_PMINTENCLR);
perf_pmu_unregister(&cd->pmu);
cpuhp_state_remove_instance_nocalls(arm_ni_hp_state, &cd->cpuhp_node);
}
}
#ifdef CONFIG_OF
static const struct of_device_id arm_ni_of_match[] = {
{ .compatible = "arm,ni-700" },
{}
};
MODULE_DEVICE_TABLE(of, arm_ni_of_match);
#endif
#ifdef CONFIG_ACPI
static const struct acpi_device_id arm_ni_acpi_match[] = {
{ "ARMHCB70" },
{}
};
MODULE_DEVICE_TABLE(acpi, arm_ni_acpi_match);
#endif
static struct platform_driver arm_ni_driver = {
.driver = {
.name = "arm-ni",
.of_match_table = of_match_ptr(arm_ni_of_match),
.acpi_match_table = ACPI_PTR(arm_ni_acpi_match),
},
.probe = arm_ni_probe,
.remove = arm_ni_remove,
};
static void arm_ni_pmu_migrate(struct arm_ni_cd *cd, unsigned int cpu)
{
perf_pmu_migrate_context(&cd->pmu, cd->cpu, cpu);
irq_set_affinity(cd->irq, cpumask_of(cpu));
cd->cpu = cpu;
}
static int arm_ni_pmu_online_cpu(unsigned int cpu, struct hlist_node *cpuhp_node)
{
struct arm_ni_cd *cd;
int node;
cd = hlist_entry_safe(cpuhp_node, struct arm_ni_cd, cpuhp_node);
node = dev_to_node(cd_to_ni(cd)->dev);
if (cpu_to_node(cd->cpu) != node && cpu_to_node(cpu) == node)
arm_ni_pmu_migrate(cd, cpu);
return 0;
}
static int arm_ni_pmu_offline_cpu(unsigned int cpu, struct hlist_node *cpuhp_node)
{
struct arm_ni_cd *cd;
unsigned int target;
int node;
cd = hlist_entry_safe(cpuhp_node, struct arm_ni_cd, cpuhp_node);
if (cpu != cd->cpu)
return 0;
node = dev_to_node(cd_to_ni(cd)->dev);
target = cpumask_any_and_but(cpumask_of_node(node), cpu_online_mask, cpu);
if (target >= nr_cpu_ids)
target = cpumask_any_but(cpu_online_mask, cpu);
if (target < nr_cpu_ids)
arm_ni_pmu_migrate(cd, target);
return 0;
}
static int __init arm_ni_init(void)
{
int ret;
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
"perf/arm/ni:online",
arm_ni_pmu_online_cpu,
arm_ni_pmu_offline_cpu);
if (ret < 0)
return ret;
arm_ni_hp_state = ret;
ret = platform_driver_register(&arm_ni_driver);
if (ret)
cpuhp_remove_multi_state(arm_ni_hp_state);
return ret;
}
static void __exit arm_ni_exit(void)
{
platform_driver_unregister(&arm_ni_driver);
cpuhp_remove_multi_state(arm_ni_hp_state);
}
module_init(arm_ni_init);
module_exit(arm_ni_exit);
MODULE_AUTHOR("Robin Murphy <robin.murphy@arm.com>");
MODULE_DESCRIPTION("Arm NI-700 PMU driver");
MODULE_LICENSE("GPL v2");