[PATCH v2 2/3] perf: Add driver for Arm NI-700 interconnect PMU
From: Robin Murphy
Date: Wed Jul 10 2024 - 12:12:00 EST
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@xxxxxxx>
---
v2:
- Add basic usage documentation
- Use __counted_by attribute
- Make group validation logic clearer (and drop PMU type check
which perf_event_open() already takes care of)
- Add retry limit to arm_ni_read_ccnt()
---
Documentation/admin-guide/perf/arm-ni.rst | 17 +
Documentation/admin-guide/perf/index.rst | 1 +
drivers/perf/Kconfig | 7 +
drivers/perf/Makefile | 1 +
drivers/perf/arm-ni.c | 778 ++++++++++++++++++++++
5 files changed, 804 insertions(+)
create mode 100644 Documentation/admin-guide/perf/arm-ni.rst
create mode 100644 drivers/perf/arm-ni.c
diff --git a/Documentation/admin-guide/perf/arm-ni.rst b/Documentation/admin-guide/perf/arm-ni.rst
new file mode 100644
index 000000000000..3cd7d0f75f0f
--- /dev/null
+++ b/Documentation/admin-guide/perf/arm-ni.rst
@@ -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 (abritrary) 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.
diff --git a/Documentation/admin-guide/perf/index.rst b/Documentation/admin-guide/perf/index.rst
index 7eb3dcd6f4da..8502bc174640 100644
--- a/Documentation/admin-guide/perf/index.rst
+++ b/Documentation/admin-guide/perf/index.rst
@@ -16,6 +16,7 @@ Performance monitor support
starfive_starlink_pmu
arm-ccn
arm-cmn
+ arm-ni
xgene-pmu
arm_dsu_pmu
thunderx2-pmu
diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
index 7526a9e714fa..adc9365b041b 100644
--- a/drivers/perf/Kconfig
+++ b/drivers/perf/Kconfig
@@ -48,6 +48,13 @@ config ARM_CMN
Support for PMU events monitoring on the Arm CMN-600 Coherent Mesh
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
depends on ARM || ARM64
bool "ARM PMU framework"
diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile
index 29b1c28203ef..d21ed2896bc7 100644
--- a/drivers/perf/Makefile
+++ b/drivers/perf/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_ARM_CCI_PMU) += arm-cci.o
obj-$(CONFIG_ARM_CCN) += arm-ccn.o
obj-$(CONFIG_ARM_CMN) += arm-cmn.o
obj-$(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-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o
obj-$(CONFIG_ARM_PMUV3) += arm_pmuv3.o
diff --git a/drivers/perf/arm-ni.c b/drivers/perf/arm-ni.c
new file mode 100644
index 000000000000..1f7b7a2eaae1
--- /dev/null
+++ b/drivers/perf/arm-ni.c
@@ -0,0 +1,778 @@
+// 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);
+ int lo = __ffs(fmt->field), hi = __fls(fmt->field);
+
+ return sysfs_emit(buf, "config:%d-%d\n", lo, hi);
+}
+
+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_validate_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;
+ struct arm_ni_val val = { 0 };
+
+ arm_ni_validate_event(event, &val);
+
+ leader = event->group_leader;
+ if (leader != event && !arm_ni_validate_event(leader, &val))
+ return - EINVAL;
+
+ for_each_sibling_event(sibling, leader) {
+ if (!arm_ni_validate_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(arm_ni_hp_state, &cd->cpuhp_node);
+ if (err)
+ return err;
+
+ return perf_pmu_register(&cd->pmu, name, -1);
+}
+
+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 int 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);
+ }
+ return 0;
+}
+
+#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 (node != NUMA_NO_NODE && 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@xxxxxxx>");
+MODULE_DESCRIPTION("Arm NI-700 PMU driver");
+MODULE_LICENSE("GPL v2");
--
2.39.2.101.g768bb238c484.dirty