Initial driver for PMU event counting on the Arm CMN-600 interconnect.
CMN sports an obnoxiously complex distributed PMU system as part of
its debug and trace features, which can do all manner of things like
sampling, cross-triggering and generating CoreSight trace. This driver
covers the PMU functionality, plus the relevant aspects of watchpoints
for simply counting matching flits.
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
---
Documentation/admin-guide/perf/arm-cmn.rst | 65 +
Documentation/admin-guide/perf/index.rst | 1 +
drivers/perf/Kconfig | 7 +
drivers/perf/Makefile | 1 +
drivers/perf/arm-cmn.c | 1653 ++++++++++++++++++++
5 files changed, 1727 insertions(+)
create mode 100644 Documentation/admin-guide/perf/arm-cmn.rst
create mode 100644 drivers/perf/arm-cmn.c
diff --git a/Documentation/admin-guide/perf/arm-cmn.rst b/Documentation/admin-guide/perf/arm-cmn.rst
new file mode 100644
index 000000000000..0e4809346014
--- /dev/null
+++ b/Documentation/admin-guide/perf/arm-cmn.rst
@@ -0,0 +1,65 @@
+=============================
+Arm Coherent Mesh Network PMU
+=============================
+
+CMN-600 is a configurable mesh interconnect consisting of a rectangular
+grid of crosspoints (XPs), with each crosspoint supporting up to two
+device ports to which various AMBA CHI agents are attached.
+
+CMN implements a distributed PMU design as part of its debug and trace
+functionality. This consists of a local monitor (DTM) at every XP, which
+counts up to 4 event signals from the connected device nodes and/or the
+XP itself. Overflow from these local counters is accumulated in up to 8
+global counters implemented by the main controller (DTC), which provides
+overall PMU control and interrupts for global counter overflow.
+
+PMU events
+----------
+
+The PMU driver registers a single PMU device for the whole interconnect,
+see /sys/bus/event_source/devices/arm_cmn. Multi-chip systems may link
+more than one CMN together via external CCIX links - in this situation,
+each mesh counts its own events entirely independently, and additional
+PMU devices will be named arm_cmn_{1..n}.
+
+Most events are specified in a format based directly on the TRM
+definitions - "type" selects the respective node type, and "eventid" the
+event number. Some events require an additional occupancy ID, which is
+specified by "occupid".
+
+* Since RN-D nodes do not have any distinct events from RN-I nodes, they
+ are treated as the same type (0xa), and the common event templates are
+ named "rnid_*".
+
+* The cycle counter is treated as a synthetic event belonging to the DTC
+ node ("type" == 0x3, "eventid" is ignored).
+
+* XP events also encode the port and channel in the "eventid" field, to
+ match the underlying pmu_event0_id encoding for the pmu_event_sel
+ register. The event templates are named with prefixes to cover all
+ permutations.
+
+By default each event provides an aggregate count over all nodes of the
+given type. To target a specific node, "bynodeid" must be set to 1 and
+"nodeid" to the appropriate value derived from the CMN configuration
+(as defined in the "Node ID Mapping" section of the TRM).
+
+Watchpoints
+-----------
+
+The PMU can also count watchpoint events to monitor specific flit
+traffic. Watchpoints are treated as a synthetic event type, and like PMU
+events can be global or targeted with a particular XP's "nodeid" value.
+Since the watchpoint direction is otherwise implicit in the underlying
+register selection, separate events are provided for flit uploads and
+downloads.
+
+The flit match value and mask are passed in config1 and config2 ("val"
+and "mask" respectively). "wp_dev_sel", "wp_chn_sel", "wp_grp" and
+"wp_exclusive" are specified per the TRM definitions for dtm_wp_config0.
+Where a watchpoint needs to match fields from both match groups on the
+REQ or SNP channel, it can be specified as two events - one for each
+group - with the same nonzero "combine" value. The count for such a
+pair of combined events will be attributed to the primary match.
+Watchpoint events with a "combine" value of 0 are considered independent
+and will count individually.
diff --git a/Documentation/admin-guide/perf/index.rst b/Documentation/admin-guide/perf/index.rst
index 47c99f40cc16..5a8f2529a033 100644
--- a/Documentation/admin-guide/perf/index.rst
+++ b/Documentation/admin-guide/perf/index.rst
@@ -12,6 +12,7 @@ Performance monitor support
qcom_l2_pmu
qcom_l3_pmu
arm-ccn
+ arm-cmn
xgene-pmu
arm_dsu_pmu
thunderx2-pmu
diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
index a9261cf48293..c49c3e1042c2 100644
--- a/drivers/perf/Kconfig
+++ b/drivers/perf/Kconfig
@@ -41,6 +41,13 @@ config ARM_CCN
PMU (perf) driver supporting the ARM CCN (Cache Coherent Network)
interconnect.
+config ARM_CMN
+ tristate "Arm CMN-600 PMU support"
+ depends on ARM64 || (COMPILE_TEST && 64BIT)
+ help
+ Support for PMU events monitoring on the Arm CMN-600 Coherent Mesh
+ Network interconnect.
+
config ARM_PMU
depends on ARM || ARM64
bool "ARM PMU framework"
diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile
index 2ebb4de17815..5365fd56f88f 100644
--- a/drivers/perf/Makefile
+++ b/drivers/perf/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
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-$(CONFIG_ARM_PMU) += arm_pmu.o arm_pmu_platform.o
obj-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
new file mode 100644
index 000000000000..125f2936fffb
--- /dev/null
+++ b/drivers/perf/arm-cmn.c
@@ -0,0 +1,1653 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2016-2020 Arm Limited
+// CMN-600 Coherent Mesh Network PMU driver
+
+#include <linux/acpi.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/perf_event.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/sort.h>
+
+/* Common register stuff */
+#define CMN_NODE_INFO 0x0000
+#define CMN_NI_NODE_TYPE GENMASK_ULL(15, 0)
+#define CMN_NI_NODE_ID GENMASK_ULL(31, 16)
+#define CMN_NI_LOGICAL_ID GENMASK_ULL(47, 32)
+
+#define CMN_NODEID_DEVID(reg) ((reg) & 3)
+#define CMN_NODEID_PID(reg) (((reg) >> 2) & 1)
+#define CMN_NODEID_X(reg, bits) ((reg) >> (3 + (bits)))
+#define CMN_NODEID_Y(reg, bits) (((reg) >> 3) & ((1U << (bits)) - 1))
+
+#define CMN_CHILD_INFO 0x0080
+#define CMN_CI_CHILD_COUNT GENMASK_ULL(15, 0)
+#define CMN_CI_CHILD_PTR_OFFSET GENMASK_ULL(31, 16)
+
+#define CMN_CHILD_NODE_ADDR GENMASK(27,0)
+#define CMN_CHILD_NODE_EXTERNAL BIT(31)
+
+#define CMN_ADDR_NODE_PTR GENMASK(27, 14)
+
+#define CMN_NODE_PTR_DEVID(ptr) (((ptr) >> 2) & 3)
+#define CMN_NODE_PTR_PID(ptr) ((ptr) & 1)
+#define CMN_NODE_PTR_X(ptr, bits) ((ptr) >> (6 + (bits)))
+#define CMN_NODE_PTR_Y(ptr, bits) (((ptr) >> 6) & ((1U << (bits)) - 1))
+
+#define CMN_MAX_XPS (8 * 8)
+
+/* The CFG node has one other useful purpose */
+#define CMN_CFGM_PERIPH_ID_2 0x0010
+#define CMN_CFGM_PID2_REVISION GENMASK(7, 4)
+
+/* PMU registers occupy the 3rd 4KB page of each node's 16KB space */
+#define CMN_PMU_OFFSET 0x2000
+
+/* For most nodes, this is all there is */
+#define CMN_PMU_EVENT_SEL 0x000
+#define CMN_PMU_EVENTn_ID_SHIFT(n) ((n) * 8)
+
+/* DTMs live in the PMU space of XP registers */
+#define CMN_DTM_WPn(n) (0x1A0 + (n) * 0x18)
+#define CMN_DTM_WPn_CONFIG(n) (CMN_DTM_WPn(n) + 0x00)
+#define CMN_DTM_WPn_CONFIG_WP_COMBINE BIT(6)
+#define CMN_DTM_WPn_CONFIG_WP_EXCLUSIVE BIT(5)
+#define CMN_DTM_WPn_CONFIG_WP_GRP BIT(4)
+#define CMN_DTM_WPn_CONFIG_WP_CHN_SEL GENMASK_ULL(3, 1)
+#define CMN_DTM_WPn_CONFIG_WP_DEV_SEL BIT(0)
+#define CMN_DTM_WPn_VAL(n) (CMN_DTM_WPn(n) + 0x08)
+#define CMN_DTM_WPn_MASK(n) (CMN_DTM_WPn(n) + 0x10)
+
+#define CMN_DTM_PMU_CONFIG 0x210
+#define CMN__PMEVCNT0_INPUT_SEL GENMASK_ULL(37, 32)
+#define CMN__PMEVCNT0_INPUT_SEL_WP 0x00
+#define CMN__PMEVCNT0_INPUT_SEL_XP 0x04
+#define CMN__PMEVCNT0_INPUT_SEL_DEV 0x10
+#define CMN__PMEVCNT0_GLOBAL_NUM GENMASK_ULL(18, 16)
+#define CMN__PMEVCNTn_GLOBAL_NUM_SHIFT(n) ((n) * 4)
+#define CMN__PMEVCNT_PAIRED(n) BIT(4 + (n))
+#define CMN__PMEVCNT23_COMBINED BIT(2)
+#define CMN__PMEVCNT01_COMBINED BIT(1)
+#define CMN_DTM_PMU_CONFIG_PMU_EN BIT(0)
+
+#define CMN_DTM_PMEVCNT 0x220
+
+#define CMN_DTM_PMEVCNTSR 0x240
+
+#define CMN_DTM_NUM_COUNTERS 4
+
+/* The DTC node is where the magic happens */
+#define CMN_DT_DTC_CTL 0x0a00
+#define CMN_DT_DTC_CTL_DT_EN BIT(0)
+
+/* DTC counters are paired in 64-bit registers on a 16-byte stride. Yuck */
+#define _CMN_DT_CNT_REG(n) ((((n) / 2) * 4 + (n) % 2) * 4)
+#define CMN_DT_PMEVCNT(n) (CMN_PMU_OFFSET + _CMN_DT_CNT_REG(n))
+#define CMN_DT_PMCCNTR (CMN_PMU_OFFSET + 0x40)
+
+#define CMN_DT_PMEVCNTSR(n) (CMN_PMU_OFFSET + 0x50 + _CMN_DT_CNT_REG(n))
+#define CMN_DT_PMCCNTRSR (CMN_PMU_OFFSET + 0x90)
+
+#define CMN_DT_PMCR (CMN_PMU_OFFSET + 0x100)
+#define CMN_DT_PMCR_PMU_EN BIT(0)
+#define CMN_DT_PMCR_CNTR_RST BIT(5)
+#define CMN_DT_PMCR_OVFL_INTR_EN BIT(6)
+
+#define CMN_DT_PMOVSR (CMN_PMU_OFFSET + 0x118)
+#define CMN_DT_PMOVSR_CLR (CMN_PMU_OFFSET + 0x120)
+
+#define CMN_DT_PMSSR (CMN_PMU_OFFSET + 0x128)
+#define CMN_DT_PMSSR_SS_STATUS(n) BIT(n)
+
+#define CMN_DT_PMSRR (CMN_PMU_OFFSET + 0x130)
+#define CMN_DT_PMSRR_SS_REQ BIT(0)
+
+#define CMN_DT_NUM_COUNTERS 8
+#define CMN_MAX_DTCS 4
+
+/*
+ * Even in the worst case a DTC counter can't wrap in fewer than 2^42 cycles,
+ * so throwing away one bit to make overflow handling easy is no big deal.
+ */
+#define CMN_COUNTER_INIT 0x80000000
+/* Similarly for the 40-bit cycle counter */
+#define CMN_CC_INIT 0x8000000000ULL
+
+
+/* Event attributes */
+#define CMN_CONFIG_TYPE GENMASK(15, 0)
+#define CMN_CONFIG_EVENTID GENMASK(23, 16)
+#define CMN_CONFIG_OCCUPID GENMASK(27, 24)
+#define CMN_CONFIG_BYNODEID BIT(31)
+#define CMN_CONFIG_NODEID GENMASK(47, 32)
+
+#define CMN_EVENT_TYPE(event) FIELD_GET(CMN_CONFIG_TYPE, (event)->attr.config)
+#define CMN_EVENT_EVENTID(event) FIELD_GET(CMN_CONFIG_EVENTID, (event)->attr.config)
+#define CMN_EVENT_OCCUPID(event) FIELD_GET(CMN_CONFIG_OCCUPID, (event)->attr.config)
+#define CMN_EVENT_BYNODEID(event) FIELD_GET(CMN_CONFIG_BYNODEID, (event)->attr.config)
+#define CMN_EVENT_NODEID(event) FIELD_GET(CMN_CONFIG_NODEID, (event)->attr.config)
+
+#define CMN_CONFIG_WP_COMBINE GENMASK(27, 24)
+#define CMN_CONFIG_WP_DEV_SEL BIT(48)
+#define CMN_CONFIG_WP_CHN_SEL GENMASK(50, 49)
+#define CMN_CONFIG_WP_GRP BIT(52)
+#define CMN_CONFIG_WP_EXCLUSIVE BIT(53)
+#define CMN_CONFIG1_WP_VAL GENMASK(63, 0)
+#define CMN_CONFIG2_WP_MASK GENMASK(63, 0)
+
+#define CMN_EVENT_WP_COMBINE(event) FIELD_GET(CMN_CONFIG_WP_COMBINE, (event)->attr.config)
+#define CMN_EVENT_WP_DEV_SEL(event) FIELD_GET(CMN_CONFIG_WP_DEV_SEL, (event)->attr.config)
+#define CMN_EVENT_WP_CHN_SEL(event) FIELD_GET(CMN_CONFIG_WP_CHN_SEL, (event)->attr.config)
+#define CMN_EVENT_WP_GRP(event) FIELD_GET(CMN_CONFIG_WP_GRP, (event)->attr.config)
+#define CMN_EVENT_WP_EXCLUSIVE(event) FIELD_GET(CMN_CONFIG_WP_EXCLUSIVE, (event)->attr.config)
+#define CMN_EVENT_WP_VAL(event) FIELD_GET(CMN_CONFIG1_WP_VAL, (event)->attr.config1)
+#define CMN_EVENT_WP_MASK(event) FIELD_GET(CMN_CONFIG2_WP_MASK, (event)->attr.config2)
+
+/* Made-up event IDs for watchpoint direction */
+#define CMN_WP_UP 0
+#define CMN_WP_DOWN 2
+
+
+/* r0px probably don't exist in silicon, thankfully */
+enum cmn_revision {
+ CMN600_R1P0,
+ CMN600_R1P1,
+ CMN600_R1P2,
+ CMN600_R1P3,
+ CMN600_R2P0,
+ CMN600_R3P0,
+};
+
+enum cmn_node_type {
+ CMN_TYPE_INVALID,
+ CMN_TYPE_DVM,
+ CMN_TYPE_CFG,
+ CMN_TYPE_DTC,
+ CMN_TYPE_HNI,
+ CMN_TYPE_HNF,
+ CMN_TYPE_XP,
+ CMN_TYPE_SBSX,
+ CMN_TYPE_RNI = 0xa,
+ CMN_TYPE_RND = 0xd,
+ CMN_TYPE_RNSAM = 0xf,
+ CMN_TYPE_CXRA = 0x100,
+ CMN_TYPE_CXHA = 0x101,
+ CMN_TYPE_CXLA = 0x102,
+ /* Not a real node type */
+ CMN_TYPE_WP = 0x7770
+};
+
+struct arm_cmn_node {
+ void __iomem *pmu_base;
+ u16 id, logid;
+ enum cmn_node_type type;
+
+ union {
+ /* Device node */
+ struct {
+ int to_xp;
+ /* DN/HN-F/CXHA */
+ unsigned int occupid_val;
+ unsigned int occupid_count;
+ };
+ /* XP */
+ struct {
+ int dtc;
+ u32 pmu_config_low;
+ union {
+ u8 input_sel[4];
+ __le32 pmu_config_high;
+ };
+ s8 wp_event[4];
+ };
+ };
+
+ union {
+ u8 event[4];
+ __le32 event_sel;
+ };
+};
+
+struct arm_cmn_dtc {
+ void __iomem *base;
+ unsigned int irq;
+ int irq_friend;
+ bool cc_active;
+
+ struct perf_event *counters[CMN_DT_NUM_COUNTERS];
+ struct perf_event *cycles;
+};
+
+#define CMN_STATE_DISABLED BIT(0)
+#define CMN_STATE_TXN BIT(1)
+
+struct arm_cmn {
+ struct device *dev;
+ void __iomem *base;
+
+ enum cmn_revision rev;
+ u8 mesh_x;
+ u8 mesh_y;
+ u16 num_xps;
+ u16 num_dns;
+ struct arm_cmn_node *xps;
+ struct arm_cmn_node *dns;
+
+ struct arm_cmn_dtc *dtc;
+ unsigned int num_dtcs;
+
+ int cpu;
+ struct hlist_node cpuhp_node;
+
+ unsigned int state;
+ struct pmu pmu;
+};
+
+#define to_cmn(p) container_of(p, struct arm_cmn, pmu)
+
+static int arm_cmn_hp_state;
+
+struct arm_cmn_hw_event {
+ struct arm_cmn_node *dn;
+ u64 dtm_idx[2];
+ unsigned int dtc_idx;
+ u8 dtcs_used;
+ u8 num_dns;
+};
+
+#define for_each_hw_dn(hw, dn, i) \
+ for (i = 0, dn = hw->dn; i < hw->num_dns; i++, dn++)
+
+static struct arm_cmn_hw_event *to_cmn_hw(struct perf_event *event)
+{
+ BUILD_BUG_ON(sizeof(struct arm_cmn_hw_event) > offsetof(struct hw_perf_event, target));
+ return (struct arm_cmn_hw_event *)&event->hw;
+}
+
+static void arm_cmn_set_index(u64 x[], unsigned int pos, unsigned int val)
+{
+ x[pos / 32] |= (u64)val << ((pos % 32) * 2);
+}
+
+static unsigned int arm_cmn_get_index(u64 x[], unsigned int pos)
+{
+ return (x[pos / 32] >> ((pos % 32) * 2)) & 3;
+}
+
+struct arm_cmn_event_attr {
+ struct device_attribute attr;
+ enum cmn_node_type type;
+ u8 eventid;
+ u8 occupid;
+};
+
+struct arm_cmn_format_attr {
+ struct device_attribute attr;
+ u64 field;
+ int config;
+};
+
+static int arm_cmn_xyidbits(const struct arm_cmn *cmn)
+{
+ return cmn->mesh_x > 4 || cmn->mesh_y > 4 ? 3 : 2;
+}
+
+static void arm_cmn_init_node_to_xp(const struct arm_cmn *cmn,
+ struct arm_cmn_node *dn)
+{
+ int bits = arm_cmn_xyidbits(cmn);
+ int x = CMN_NODEID_X(dn->id, bits);
+ int y = CMN_NODEID_Y(dn->id, bits);
+ int xp_idx = cmn->mesh_x * y + x;
+
+ dn->to_xp = (cmn->xps + xp_idx) - dn;
+}
+
+static struct arm_cmn_node *arm_cmn_node_to_xp(struct arm_cmn_node *dn)
+{
+ return dn->type == CMN_TYPE_XP ? dn : dn + dn->to_xp;
+}
+
+static struct arm_cmn_node *arm_cmn_node(const struct arm_cmn *cmn,
+ enum cmn_node_type type)
+{
+ int i;
+
+ for (i = 0; i < cmn->num_dns; i++)
+ if (cmn->dns[i].type == type)
+ return &cmn->dns[i];
+ return NULL;
+}
+
+#define CMN_EVENT_ATTR(_name, _type, _eventid, _occupid) \
+ (&((struct arm_cmn_event_attr[]) {{ \
+ .attr = __ATTR(_name, 0444, arm_cmn_event_show, NULL), \
+ .type = _type, \
+ .eventid = _eventid, \
+ .occupid = _occupid, \
+ }})[0].attr.attr)
+
+static bool arm_cmn_is_occup_event(enum cmn_node_type type, unsigned int id)
+{
+ return (type == CMN_TYPE_DVM && id == 0x05) ||
+ (type == CMN_TYPE_HNF && id == 0x0f);
+}
+
+static ssize_t arm_cmn_event_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct arm_cmn_event_attr *eattr;
+
+ eattr = container_of(attr, typeof(*eattr), attr);
+
+ if (eattr->type == CMN_TYPE_DTC)
+ return snprintf(buf, PAGE_SIZE, "type=0x%x\n", eattr->type);
+
+ if (eattr->type == CMN_TYPE_WP)
+ return snprintf(buf, PAGE_SIZE,
+ "type=0x%x,eventid=0x%x,wp_dev_sel=?,wp_chn_sel=?,wp_grp=?,wp_val=?,wp_mask=?\n",
+ eattr->type, eattr->eventid);
+
+ if (arm_cmn_is_occup_event(eattr->type, eattr->eventid))
+ return snprintf(buf, PAGE_SIZE, "type=0x%x,eventid=0x%x,occupid=0x%x\n",
+ eattr->type, eattr->eventid, eattr->occupid);
+
+ return snprintf(buf, PAGE_SIZE, "type=0x%x,eventid=0x%x\n",
+ eattr->type, eattr->eventid);
+}
+
+static umode_t arm_cmn_event_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr,
+ int unused)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct arm_cmn *cmn = to_cmn(dev_get_drvdata(dev));
+ struct arm_cmn_event_attr *eattr;
+ enum cmn_node_type type;
+
+ eattr = container_of(attr, typeof(*eattr), attr.attr);
+ type = eattr->type;
+
+ /* Watchpoints aren't nodes */
+ if (type == CMN_TYPE_WP)
+ type = CMN_TYPE_XP;
+
+ /* Revision-specific differences */
+ if (cmn->rev < CMN600_R1P2) {
+ if (type == CMN_TYPE_HNF && eattr->eventid == 0x1b)
+ return 0;
+ }
+
+ if (!arm_cmn_node(cmn, type))
+ return 0;
+
+ return attr->mode;
+}
+
+#define _CMN_EVENT_DVM(_name, _event, _occup) \
+ CMN_EVENT_ATTR(dn_##_name, CMN_TYPE_DVM, _event, _occup)
+#define CMN_EVENT_DTC(_name) \
+ CMN_EVENT_ATTR(dtc_##_name, CMN_TYPE_DTC, 0, 0)
+#define _CMN_EVENT_HNF(_name, _event, _occup) \
+ CMN_EVENT_ATTR(hnf_##_name, CMN_TYPE_HNF, _event, _occup)
+#define CMN_EVENT_HNI(_name, _event) \
+ CMN_EVENT_ATTR(hni_##_name, CMN_TYPE_HNI, _event, 0)
+#define __CMN_EVENT_XP(_name, _event) \
+ CMN_EVENT_ATTR(mxp_##_name, CMN_TYPE_XP, _event, 0)
+#define CMN_EVENT_SBSX(_name, _event) \
+ CMN_EVENT_ATTR(sbsx_##_name, CMN_TYPE_SBSX, _event, 0)
+#define CMN_EVENT_RNID(_name, _event) \
+ CMN_EVENT_ATTR(rnid_##_name, CMN_TYPE_RNI, _event, 0)
+
+#define CMN_EVENT_DVM(_name, _event) \
+ _CMN_EVENT_DVM(_name, _event, 0)
+#define CMN_EVENT_HNF(_name, _event) \
+ _CMN_EVENT_HNF(_name, _event, 0)
+#define _CMN_EVENT_XP(_name, _event) \
+ __CMN_EVENT_XP(e_##_name, (_event) | (0 << 2)), \
+ __CMN_EVENT_XP(w_##_name, (_event) | (1 << 2)), \
+ __CMN_EVENT_XP(n_##_name, (_event) | (2 << 2)), \
+ __CMN_EVENT_XP(s_##_name, (_event) | (3 << 2)), \
+ __CMN_EVENT_XP(p0_##_name, (_event) | (4 << 2)), \
+ __CMN_EVENT_XP(p1_##_name, (_event) | (5 << 2))
+
+/* Good thing there are only 3 fundamental XP events... */
+#define CMN_EVENT_XP(_name, _event) \
+ _CMN_EVENT_XP(req_##_name, (_event) | (0 << 5)), \
+ _CMN_EVENT_XP(rsp_##_name, (_event) | (1 << 5)), \
+ _CMN_EVENT_XP(snp_##_name, (_event) | (2 << 5)), \
+ _CMN_EVENT_XP(dat_##_name, (_event) | (3 << 5))
+
+
+static struct attribute *arm_cmn_event_attrs[] = {
+ CMN_EVENT_DTC(cycles),
+
+ /*
+ * DVM node events conflict with HN-I events in the equivalent PMU
+ * slot, but our lazy short-cut of using the DTM counter index for
+ * the PMU index as well happens to avoid that by construction.
+ */
+ CMN_EVENT_DVM(rxreq_dvmop, 0x01),
+ CMN_EVENT_DVM(rxreq_dvmsync, 0x02),
+ CMN_EVENT_DVM(rxreq_dvmop_vmid_filtered, 0x03),
+ CMN_EVENT_DVM(rxreq_retried, 0x04),
+ _CMN_EVENT_DVM(rxreq_trk_occupancy_all, 0x05, 0),
+ _CMN_EVENT_DVM(rxreq_trk_occupancy_dvmop, 0x05, 1),
+ _CMN_EVENT_DVM(rxreq_trk_occupancy_dvmsync, 0x05, 2),
+
+ CMN_EVENT_HNF(cache_miss, 0x01),
+ CMN_EVENT_HNF(slc_sf_cache_access, 0x02),
+ CMN_EVENT_HNF(cache_fill, 0x03),
+ CMN_EVENT_HNF(pocq_retry, 0x04),
+ CMN_EVENT_HNF(pocq_reqs_recvd, 0x05),
+ CMN_EVENT_HNF(sf_hit, 0x06),
+ CMN_EVENT_HNF(sf_evictions, 0x07),
+ CMN_EVENT_HNF(dir_snoops_sent, 0x08),
+ CMN_EVENT_HNF(brd_snoops_sent, 0x09),
+ CMN_EVENT_HNF(slc_eviction, 0x0a),
+ CMN_EVENT_HNF(slc_fill_invalid_way, 0x0b),
+ CMN_EVENT_HNF(mc_retries, 0x0c),
+ CMN_EVENT_HNF(mc_reqs, 0x0d),
+ CMN_EVENT_HNF(qos_hh_retry, 0x0e),
+ _CMN_EVENT_HNF(qos_pocq_occupancy_all, 0x0f, 0),
+ _CMN_EVENT_HNF(qos_pocq_occupancy_read, 0x0f, 1),
+ _CMN_EVENT_HNF(qos_pocq_occupancy_write, 0x0f, 2),
+ _CMN_EVENT_HNF(qos_pocq_occupancy_atomic, 0x0f, 3),
+ _CMN_EVENT_HNF(qos_pocq_occupancy_stash, 0x0f, 4),
+ CMN_EVENT_HNF(pocq_addrhaz, 0x10),
+ CMN_EVENT_HNF(pocq_atomic_addrhaz, 0x11),
+ CMN_EVENT_HNF(ld_st_swp_adq_full, 0x12),
+ CMN_EVENT_HNF(cmp_adq_full, 0x13),
+ CMN_EVENT_HNF(txdat_stall, 0x14),
+ CMN_EVENT_HNF(txrsp_stall, 0x15),
+ CMN_EVENT_HNF(seq_full, 0x16),
+ CMN_EVENT_HNF(seq_hit, 0x17),
+ CMN_EVENT_HNF(snp_sent, 0x18),
+ CMN_EVENT_HNF(sfbi_dir_snp_sent, 0x19),
+ CMN_EVENT_HNF(sfbi_brd_snp_sent, 0x1a),
+ CMN_EVENT_HNF(snp_sent_untrk, 0x1b),
+ CMN_EVENT_HNF(intv_dirty, 0x1c),
+ CMN_EVENT_HNF(stash_snp_sent, 0x1d),
+ CMN_EVENT_HNF(stash_data_pull, 0x1e),
+ CMN_EVENT_HNF(snp_fwded, 0x1f),
+
+ CMN_EVENT_HNI(rrt_rd_occ_cnt_ovfl, 0x20),
+ CMN_EVENT_HNI(rrt_wr_occ_cnt_ovfl, 0x21),
+ CMN_EVENT_HNI(rdt_rd_occ_cnt_ovfl, 0x22),
+ CMN_EVENT_HNI(rdt_wr_occ_cnt_ovfl, 0x23),
+ CMN_EVENT_HNI(wdb_occ_cnt_ovfl, 0x24),
+ CMN_EVENT_HNI(rrt_rd_alloc, 0x25),
+ CMN_EVENT_HNI(rrt_wr_alloc, 0x26),
+ CMN_EVENT_HNI(rdt_rd_alloc, 0x27),
+ CMN_EVENT_HNI(rdt_wr_alloc, 0x28),
+ CMN_EVENT_HNI(wdb_alloc, 0x29),
+ CMN_EVENT_HNI(txrsp_retryack, 0x2a),
+ CMN_EVENT_HNI(arvalid_no_arready, 0x2b),
+ CMN_EVENT_HNI(arready_no_arvalid, 0x2c),
+ CMN_EVENT_HNI(awvalid_no_awready, 0x2d),
+ CMN_EVENT_HNI(awready_no_awvalid, 0x2e),
+ CMN_EVENT_HNI(wvalid_no_wready, 0x2f),
+ CMN_EVENT_HNI(txdat_stall, 0x30),
+ CMN_EVENT_HNI(nonpcie_serialization, 0x31),
+ CMN_EVENT_HNI(pcie_serialization, 0x32),
+
+ CMN_EVENT_XP(txflit_valid, 0x01),
+ CMN_EVENT_XP(txflit_stall, 0x02),
+ CMN_EVENT_XP(partial_dat_flit, 0x03),
+ /* We treat watchpoints as a special made-up class of XP events */
+ CMN_EVENT_ATTR(watchpoint_up, CMN_TYPE_WP, 0, 0),
+ CMN_EVENT_ATTR(watchpoint_down, CMN_TYPE_WP, 2, 0),
+
+ CMN_EVENT_SBSX(rd_req, 0x01),
+ CMN_EVENT_SBSX(wr_req, 0x02),
+ CMN_EVENT_SBSX(cmo_req, 0x03),
+ CMN_EVENT_SBSX(txrsp_retryack, 0x04),
+ CMN_EVENT_SBSX(txdat_flitv, 0x05),
+ CMN_EVENT_SBSX(txrsp_flitv, 0x06),
+ CMN_EVENT_SBSX(rd_req_trkr_occ_cnt_ovfl, 0x11),
+ CMN_EVENT_SBSX(wr_req_trkr_occ_cnt_ovfl, 0x12),
+ CMN_EVENT_SBSX(cmo_req_trkr_occ_cnt_ovfl, 0x13),
+ CMN_EVENT_SBSX(wdb_occ_cnt_ovfl, 0x14),
+ CMN_EVENT_SBSX(rd_axi_trkr_occ_cnt_ovfl, 0x15),
+ CMN_EVENT_SBSX(cmo_axi_trkr_occ_cnt_ovfl, 0x16),
+ CMN_EVENT_SBSX(arvalid_no_arready, 0x21),
+ CMN_EVENT_SBSX(awvalid_no_awready, 0x22),
+ CMN_EVENT_SBSX(wvalid_no_wready, 0x23),
+ CMN_EVENT_SBSX(txdat_stall, 0x24),
+ CMN_EVENT_SBSX(txrsp_stall, 0x25),
+
+ CMN_EVENT_RNID(s0_rdata_beats, 0x01),
+ CMN_EVENT_RNID(s1_rdata_beats, 0x02),
+ CMN_EVENT_RNID(s2_rdata_beats, 0x03),
+ CMN_EVENT_RNID(rxdat_flits, 0x04),
+ CMN_EVENT_RNID(txdat_flits, 0x05),
+ CMN_EVENT_RNID(txreq_flits_total, 0x06),
+ CMN_EVENT_RNID(txreq_flits_retried, 0x07),
+ CMN_EVENT_RNID(rrt_occ_ovfl, 0x08),
+ CMN_EVENT_RNID(wrt_occ_ovfl, 0x09),
+ CMN_EVENT_RNID(txreq_flits_replayed, 0x0a),
+ CMN_EVENT_RNID(wrcancel_sent, 0x0b),
+ CMN_EVENT_RNID(s0_wdata_beats, 0x0c),
+ CMN_EVENT_RNID(s1_wdata_beats, 0x0d),
+ CMN_EVENT_RNID(s2_wdata_beats, 0x0e),
+ CMN_EVENT_RNID(rrt_alloc, 0x0f),
+ CMN_EVENT_RNID(wrt_alloc, 0x10),
+ CMN_EVENT_RNID(rdb_unord, 0x11),
+ CMN_EVENT_RNID(rdb_replay, 0x12),
+ CMN_EVENT_RNID(rdb_hybrid, 0x13),
+ CMN_EVENT_RNID(rdb_ord, 0x14),
+
+ NULL
+};
+
+static const struct attribute_group arm_cmn_event_attrs_group = {
+ .name = "events",
+ .attrs = arm_cmn_event_attrs,
+ .is_visible = arm_cmn_event_attr_is_visible,
+};
+
+static ssize_t arm_cmn_format_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct arm_cmn_format_attr *fmt = container_of(attr, typeof(*fmt), attr);
+ int lo = __ffs(fmt->field), hi = __fls(fmt->field);
+
+ if (lo == hi)
+ return snprintf(buf, PAGE_SIZE, "config:%d\n", lo);
+
+ if (!fmt->config)
+ return snprintf(buf, PAGE_SIZE, "config:%d-%d\n", lo, hi);
+
+ return snprintf(buf, PAGE_SIZE, "config%d:%d-%d\n", fmt->config, lo, hi);
+}
+
+#define _CMN_FORMAT_ATTR(_name, _cfg, _fld) \
+ (&((struct arm_cmn_format_attr[]) {{ \
+ .attr = __ATTR(_name, 0444, arm_cmn_format_show, NULL), \
+ .config = _cfg, \
+ .field = _fld, \
+ }})[0].attr.attr)
+#define CMN_FORMAT_ATTR(_name, _fld) _CMN_FORMAT_ATTR(_name, 0, _fld)
+
+static struct attribute *arm_cmn_format_attrs[] = {
+ CMN_FORMAT_ATTR(type, CMN_CONFIG_TYPE),
+ CMN_FORMAT_ATTR(eventid, CMN_CONFIG_EVENTID),
+ CMN_FORMAT_ATTR(occupid, CMN_CONFIG_OCCUPID),
+ CMN_FORMAT_ATTR(bynodeid, CMN_CONFIG_BYNODEID),
+ CMN_FORMAT_ATTR(nodeid, CMN_CONFIG_NODEID),
+
+ CMN_FORMAT_ATTR(wp_dev_sel, CMN_CONFIG_WP_DEV_SEL),
+ CMN_FORMAT_ATTR(wp_chn_sel, CMN_CONFIG_WP_CHN_SEL),
+ CMN_FORMAT_ATTR(wp_grp, CMN_CONFIG_WP_GRP),
+ CMN_FORMAT_ATTR(wp_exclusive, CMN_CONFIG_WP_EXCLUSIVE),
+ CMN_FORMAT_ATTR(wp_combine, CMN_CONFIG_WP_COMBINE),
+
+ _CMN_FORMAT_ATTR(wp_val, 1, CMN_CONFIG1_WP_VAL),
+ _CMN_FORMAT_ATTR(wp_mask, 2, CMN_CONFIG2_WP_MASK),
+
+ NULL
+};
+
+static const struct attribute_group arm_cmn_format_attrs_group = {
+ .name = "format",
+ .attrs = arm_cmn_format_attrs,
+};
+
+static ssize_t arm_cmn_cpumask_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct arm_cmn *cmn = to_cmn(dev_get_drvdata(dev));
+
+ return cpumap_print_to_pagebuf(true, buf, cpumask_of(cmn->cpu));
+}
+
+static struct device_attribute arm_cmn_cpumask_attr =
+ __ATTR(cpumask, 0444, arm_cmn_cpumask_show, NULL);
+
+static struct attribute *arm_cmn_cpumask_attrs[] = {
+ &arm_cmn_cpumask_attr.attr,
+ NULL,
+};
+
+static struct attribute_group arm_cmn_cpumask_attr_group = {
+ .attrs = arm_cmn_cpumask_attrs,
+};
+
+static const struct attribute_group *arm_cmn_attr_groups[] = {
+ &arm_cmn_event_attrs_group,
+ &arm_cmn_format_attrs_group,
+ &arm_cmn_cpumask_attr_group,
+ NULL
+};
+
+static int arm_cmn_wp_idx(struct perf_event *event)
+{
+ return CMN_EVENT_EVENTID(event) + CMN_EVENT_WP_GRP(event);
+}
+
+static u32 arm_cmn_wp_config(struct perf_event *event)
+{
+ u32 config;
+ u32 dev = CMN_EVENT_WP_DEV_SEL(event);
+ u32 chn = CMN_EVENT_WP_CHN_SEL(event);
+ u32 grp = CMN_EVENT_WP_GRP(event);
+ u32 exc = CMN_EVENT_WP_EXCLUSIVE(event);
+ u32 combine = CMN_EVENT_WP_COMBINE(event);
+
+ config = FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_DEV_SEL, dev) |
+ FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_CHN_SEL, chn) |
+ FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_GRP, grp) |
+ FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_EXCLUSIVE, exc);
+ if (combine && !grp)
+ config |= CMN_DTM_WPn_CONFIG_WP_COMBINE;
+
+ return config;
+}
+
+static void arm_cmn_set_state(struct arm_cmn *cmn, u32 state)
+{
+ if (!cmn->state)
+ writel_relaxed(0, cmn->dtc[0].base + CMN_DT_PMCR);
+ cmn->state |= state;
+}
+
+static void arm_cmn_clear_state(struct arm_cmn *cmn, u32 state)
+{
+ cmn->state &= ~state;
+ if (!cmn->state)
+ writel_relaxed(CMN_DT_PMCR_PMU_EN | CMN_DT_PMCR_OVFL_INTR_EN,
+ cmn->dtc[0].base + CMN_DT_PMCR);
+}
+
+static void arm_cmn_pmu_enable(struct pmu *pmu)
+{
+ arm_cmn_clear_state(to_cmn(pmu), CMN_STATE_DISABLED);
+}
+
+static void arm_cmn_pmu_disable(struct pmu *pmu)
+{
+ arm_cmn_set_state(to_cmn(pmu), CMN_STATE_DISABLED);
+}
+
+static u64 arm_cmn_read_dtm(struct arm_cmn *cmn, struct arm_cmn_hw_event *hw,
+ bool snapshot)
+{
+ struct arm_cmn_node *dn;
+ unsigned int i, offset;
+ u64 count = 0;
+
+ offset = snapshot ? CMN_DTM_PMEVCNTSR : CMN_DTM_PMEVCNT;
+ for_each_hw_dn(hw, dn, i) {
+ struct arm_cmn_node *xp = arm_cmn_node_to_xp(dn);
+ int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i);
+ u64 reg = readq_relaxed(xp->pmu_base + offset);
+ u16 dtm_count = reg >> (dtm_idx * 16);
+
+ count += dtm_count;
+ }
+ return count;
+}
+
+static u64 arm_cmn_read_cc(struct arm_cmn_dtc *dtc)
+{
+ u64 val = readq_relaxed(dtc->base + CMN_DT_PMCCNTR);
+
+ writeq_relaxed(CMN_CC_INIT, dtc->base + CMN_DT_PMCCNTR);
+ return (val - CMN_CC_INIT) & ((CMN_CC_INIT << 1) - 1);
+}
+
+static u32 arm_cmn_read_counter(struct arm_cmn_dtc *dtc, int idx)
+{
+ u32 val, pmevcnt = CMN_DT_PMEVCNT(idx);
+
+ val = readl_relaxed(dtc->base + pmevcnt);
+ writel_relaxed(CMN_COUNTER_INIT, dtc->base + pmevcnt);
+ return val - CMN_COUNTER_INIT;
+}
+
+static void arm_cmn_init_counter(struct perf_event *event)
+{
+ struct arm_cmn *cmn = to_cmn(event->pmu);
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ unsigned int i, pmevcnt = CMN_DT_PMEVCNT(hw->dtc_idx);
+ u64 count;
+
+ for (i = 0; hw->dtcs_used & (1U << i); i++) {
+ writel_relaxed(CMN_COUNTER_INIT, cmn->dtc[i].base + pmevcnt);
+ cmn->dtc[i].counters[hw->dtc_idx] = event;
+ }
+
+ count = arm_cmn_read_dtm(cmn, hw, false);
+ local64_set(&event->hw.prev_count, count);
+}
+
+static void arm_cmn_event_read(struct perf_event *event)
+{
+ struct arm_cmn *cmn = to_cmn(event->pmu);
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ u64 delta, new, prev;
+ unsigned long flags;
+ unsigned int i;
+
+ if (hw->dtc_idx == CMN_DT_NUM_COUNTERS) {
+ i = __ffs(hw->dtcs_used);
+ delta = arm_cmn_read_cc(cmn->dtc + i);
+ local64_add(delta, &event->count);
+ return;
+ }
+ new = arm_cmn_read_dtm(cmn, hw, false);
+ prev = local64_xchg(&event->hw.prev_count, new);
+
+ delta = new - prev;
+
+ local_irq_save(flags);
+ for (i = 0; hw->dtcs_used & (1U << i); i++) {
+ new = arm_cmn_read_counter(cmn->dtc + i, hw->dtc_idx);
+ delta += new << 16;
+ }
+ local_irq_restore(flags);
+ local64_add(delta, &event->count);
+}
+
+static void arm_cmn_event_start(struct perf_event *event, int flags)
+{
+ struct arm_cmn *cmn = to_cmn(event->pmu);
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ struct arm_cmn_node *dn;
+ enum cmn_node_type type = CMN_EVENT_TYPE(event);
+ int i;
+
+ if (type == CMN_TYPE_DTC) {
+ i = __ffs(hw->dtcs_used);
+ writeq_relaxed(CMN_CC_INIT, cmn->dtc[i].base + CMN_DT_PMCCNTR);
+ cmn->dtc[i].cc_active = true;
+ } else if (type == CMN_TYPE_WP) {
+ int wp_idx = arm_cmn_wp_idx(event);
+ u64 val = CMN_EVENT_WP_VAL(event);
+ u64 mask = CMN_EVENT_WP_MASK(event);
+
+ for_each_hw_dn(hw, dn, i) {
+ writeq_relaxed(val, dn->pmu_base + CMN_DTM_WPn_VAL(wp_idx));
+ writeq_relaxed(mask, dn->pmu_base + CMN_DTM_WPn_MASK(wp_idx));
+ }
+ } else for_each_hw_dn(hw, dn, i) {
+ int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i);
+
+ dn->event[dtm_idx] = CMN_EVENT_EVENTID(event);
+ writel_relaxed(le32_to_cpu(dn->event_sel), dn->pmu_base + CMN_PMU_EVENT_SEL);
+ }
+}
+
+static void arm_cmn_event_stop(struct perf_event *event, int flags)
+{
+ struct arm_cmn *cmn = to_cmn(event->pmu);
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ struct arm_cmn_node *dn;
+ enum cmn_node_type type = CMN_EVENT_TYPE(event);
+ int i;
+
+ if (type == CMN_TYPE_DTC) {
+ i = __ffs(hw->dtcs_used);
+ cmn->dtc[i].cc_active = false;
+ } else if (type == CMN_TYPE_WP) {
+ int wp_idx = arm_cmn_wp_idx(event);
+
+ for_each_hw_dn(hw, dn, i) {
+ writeq_relaxed(0, dn->pmu_base + CMN_DTM_WPn_MASK(wp_idx));
+ writeq_relaxed(~0ULL, dn->pmu_base + CMN_DTM_WPn_VAL(wp_idx));
+ }
+ } else for_each_hw_dn(hw, dn, i) {
+ int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i);
+
+ dn->event[dtm_idx] = 0;
+ writel_relaxed(le32_to_cpu(dn->event_sel), dn->pmu_base + CMN_PMU_EVENT_SEL);
+ }
+
+ arm_cmn_event_read(event);
+}
+
+struct arm_cmn_val {
+ u8 dtm_count[CMN_MAX_XPS];
+ u8 occupid[CMN_MAX_XPS];
+ u8 wp[CMN_MAX_XPS][4];
+ int dtc_count;
+ bool cycles;
+};
+
+static void arm_cmn_val_add_event(struct arm_cmn_val *val, struct perf_event *event)
+{
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ struct arm_cmn_node *dn;
+ enum cmn_node_type type;
+ int i;
+ u8 occupid;
+
+ if (is_software_event(event))
+ return;
+
+ type = CMN_EVENT_TYPE(event);
+ if (type == CMN_TYPE_DTC) {
+ val->cycles = true;
+ return;
+ }
+
+ val->dtc_count++;
+ if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event)))
+ occupid = CMN_EVENT_OCCUPID(event) + 1;
+ else
+ occupid = 0;
+
+ for_each_hw_dn(hw, dn, i) {
+ int wp_idx, xp = arm_cmn_node_to_xp(dn)->logid;
+
+ val->dtm_count[xp]++;
+ val->occupid[xp] = occupid;
+
+ if (type != CMN_TYPE_WP)
+ continue;
+
+ wp_idx = arm_cmn_wp_idx(event);
+ val->wp[xp][wp_idx] = CMN_EVENT_WP_COMBINE(event) + 1;
+ }
+}
+
+static int arm_cmn_validate_group(struct perf_event *event)
+{
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ struct arm_cmn_node *dn;
+ struct perf_event *sibling, *leader = event->group_leader;
+ enum cmn_node_type type;
+ struct arm_cmn_val val;
+ int i;
+ u8 occupid;
+
+ if (leader == event)
+ return 0;
+
+ if (event->pmu != leader->pmu && !is_software_event(leader))
+ return -EINVAL;
+
+ memset(&val, 0, sizeof(val));
+
+ arm_cmn_val_add_event(&val, leader);
+ for_each_sibling_event(sibling, leader)
+ arm_cmn_val_add_event(&val, sibling);
+
+ type = CMN_EVENT_TYPE(event);
+ if (type == CMN_TYPE_DTC)
+ return val.cycles ? -EINVAL : 0;
+
+ if (val.dtc_count == CMN_DT_NUM_COUNTERS)
+ return -EINVAL;
+
+ if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event)))
+ occupid = CMN_EVENT_OCCUPID(event) + 1;
+ else
+ occupid = 0;
+
+ for_each_hw_dn(hw, dn, i) {
+ int wp_idx, wp_cmb, xp = arm_cmn_node_to_xp(dn)->logid;
+
+ if (val.dtm_count[xp] == CMN_DTM_NUM_COUNTERS)
+ return -EINVAL;
+
+ if (occupid && val.occupid[xp] && occupid != val.occupid[xp])
+ return -EINVAL;
+
+ if (type != CMN_TYPE_WP)
+ continue;
+
+ wp_idx = arm_cmn_wp_idx(event);
+ if (val.wp[xp][wp_idx])
+ return -EINVAL;
+
+ wp_cmb = val.wp[xp][wp_idx ^ 1];
+ if (wp_cmb && wp_cmb != CMN_EVENT_WP_COMBINE(event) + 1)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int arm_cmn_event_init(struct perf_event *event)
+{
+ struct arm_cmn *cmn = to_cmn(event->pmu);
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ enum cmn_node_type type;
+ unsigned int i;
+ bool bynodeid;
+ u16 nodeid, eventid;
+
+ if (event->attr.type != event->pmu->type)
+ return -ENOENT;
+
+ if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
+ return -EINVAL;
+
+ event->cpu = cmn->cpu;
+ if (event->cpu < 0)
+ return -EINVAL;
+
+ type = CMN_EVENT_TYPE(event);
+ /* DTC events (i.e. cycles) already have everything they need */
+ if (type == CMN_TYPE_DTC)
+ return 0;
+
+ /* For watchpoints we need the actual XP node here */
+ if (type == CMN_TYPE_WP) {
+ type = CMN_TYPE_XP;
+ /* ...and we need a "real" direction */
+ eventid = CMN_EVENT_EVENTID(event);
+ if (eventid != CMN_WP_UP && eventid != CMN_WP_DOWN)
+ return -EINVAL;
+ }
+
+ bynodeid = CMN_EVENT_BYNODEID(event);
+ nodeid = CMN_EVENT_NODEID(event);
+
+ hw->dn = arm_cmn_node(cmn, type);
+ for (i = hw->dn - cmn->dns; i < cmn->num_dns && cmn->dns[i].type == type; i++) {
+ if (!bynodeid) {
+ hw->num_dns++;
+ } else if (cmn->dns[i].id != nodeid) {
+ hw->dn++;
+ } else {
+ hw->num_dns = 1;
+ break;
+ }
+ }
+
+ if (!hw->num_dns) {
+ int bits = arm_cmn_xyidbits(cmn);
+
+ dev_dbg(cmn->dev, "invalid node 0x%x (%d,%d,%d,%d) type 0x%x\n",
+ nodeid, CMN_NODEID_X(nodeid, bits), CMN_NODEID_Y(nodeid, bits),
+ CMN_NODEID_PID(nodeid), CMN_NODEID_DEVID(nodeid), type);
+ return -EINVAL;
+ }
+ /*
+ * By assuming events count in all DTC domains, we cunningly avoid
+ * needing to know anything about how XPs are assigned to domains.
+ */
+ hw->dtcs_used = (1U << cmn->num_dtcs) - 1;
+
+ return arm_cmn_validate_group(event);
+}
+
+static void arm_cmn_event_clear(struct arm_cmn *cmn, struct perf_event *event,
+ int i)
+{
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ enum cmn_node_type type = CMN_EVENT_TYPE(event);
+
+ while (i--) {
+ struct arm_cmn_node *xp = arm_cmn_node_to_xp(hw->dn + i);
+ unsigned int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i);
+
+ if (type == CMN_TYPE_WP)
+ hw->dn[i].wp_event[arm_cmn_wp_idx(event)] = -1;
+
+ if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event)))
+ hw->dn[i].occupid_count--;
+
+ xp->pmu_config_low &= ~CMN__PMEVCNT_PAIRED(dtm_idx);
+ writel_relaxed(xp->pmu_config_low, xp->pmu_base + CMN_DTM_PMU_CONFIG);
+ }
+ memset(hw->dtm_idx, 0, sizeof(hw->dtm_idx));
+
+ for (i = 0; hw->dtcs_used & (1U << i); i++)
+ cmn->dtc[i].counters[hw->dtc_idx] = NULL;
+}
+
+static int arm_cmn_event_add(struct perf_event *event, int flags)
+{
+ struct arm_cmn *cmn = to_cmn(event->pmu);
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ struct arm_cmn_dtc *dtc = &cmn->dtc[0];
+ struct arm_cmn_node *dn;
+ enum cmn_node_type type = CMN_EVENT_TYPE(event);
+ unsigned int i, dtc_idx, input_sel;
+
+ if (type == CMN_TYPE_DTC) {
+ i = 0;
+ while (cmn->dtc[i].cycles)
+ if (++i == cmn->num_dtcs)
+ return -ENOSPC;
+
+ cmn->dtc[i].cycles = event;
+ hw->dtc_idx = CMN_DT_NUM_COUNTERS;
+ hw->dtcs_used = 1U << i;
+
+ if (flags & PERF_EF_START)
+ arm_cmn_event_start(event, 0);
+ return 0;
+ }
+
+ /* Grab a free global counter first... */
+ dtc_idx = 0;
+ while (dtc->counters[dtc_idx])
+ if (++dtc_idx == CMN_DT_NUM_COUNTERS)
+ return -ENOSPC;
+
+ hw->dtc_idx = dtc_idx;
+
+ /* ...then the local counters to feed it. */
+ for_each_hw_dn(hw, dn, i) {
+ struct arm_cmn_node *xp = arm_cmn_node_to_xp(dn);
+ unsigned int dtm_idx, shift;
+ u64 reg;
+
+ dtm_idx = 0;
+ while (xp->pmu_config_low & CMN__PMEVCNT_PAIRED(dtm_idx))
+ if (++dtm_idx == CMN_DTM_NUM_COUNTERS)
+ goto free_dtms;
+
+ if (type == CMN_TYPE_XP) {
+ input_sel = CMN__PMEVCNT0_INPUT_SEL_XP + dtm_idx;
+ } else if (type == CMN_TYPE_WP) {
+ int tmp, wp_idx = arm_cmn_wp_idx(event);
+ u32 cfg = arm_cmn_wp_config(event);
+
+ if (dn->wp_event[wp_idx] >= 0)
+ goto free_dtms;
+
+ tmp = dn->wp_event[wp_idx ^ 1];
+ if (tmp >= 0 && CMN_EVENT_WP_COMBINE(event) !=
+ CMN_EVENT_WP_COMBINE(dtc->counters[tmp]))
+ goto free_dtms;
+
+ input_sel = CMN__PMEVCNT0_INPUT_SEL_WP + wp_idx;
+ dn->wp_event[wp_idx] = dtc_idx;
+ writel_relaxed(cfg, dn->pmu_base + CMN_DTM_WPn_CONFIG(wp_idx));
+ } else {
+ unsigned int port = CMN_NODEID_PID(dn->id);
+ unsigned int dev = CMN_NODEID_DEVID(dn->id);
+
+ input_sel = CMN__PMEVCNT0_INPUT_SEL_DEV + dtm_idx +
+ (port << 4) + (dev << 2);
+
+ if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event))) {
+ int occupid = CMN_EVENT_OCCUPID(event);
+
+ if (dn->occupid_count == 0) {
+ dn->occupid_val = occupid;
+ writel_relaxed(occupid,
+ dn->pmu_base + CMN_PMU_EVENT_SEL + 4);
+ } else if (dn->occupid_val != occupid) {
+ goto free_dtms;
+ }
+ dn->occupid_count++;
+ }
+ }
+
+ arm_cmn_set_index(hw->dtm_idx, i, dtm_idx);
+
+ xp->input_sel[dtm_idx] = input_sel;
+ shift = CMN__PMEVCNTn_GLOBAL_NUM_SHIFT(dtm_idx);
+ xp->pmu_config_low &= ~(CMN__PMEVCNT0_GLOBAL_NUM << shift);
+ xp->pmu_config_low |= FIELD_PREP(CMN__PMEVCNT0_GLOBAL_NUM, dtc_idx) << shift;
+ xp->pmu_config_low |= CMN__PMEVCNT_PAIRED(dtm_idx);
+ reg = (u64)le32_to_cpu(xp->pmu_config_high) << 32 | xp->pmu_config_low;
+ writeq_relaxed(reg, xp->pmu_base + CMN_DTM_PMU_CONFIG);
+ }
+
+ /* Go go go! */
+ arm_cmn_init_counter(event);
+
+ if (flags & PERF_EF_START)
+ arm_cmn_event_start(event, 0);
+
+ return 0;
+
+free_dtms:
+ arm_cmn_event_clear(cmn, event, i);
+ return -ENOSPC;
+}
+
+static void arm_cmn_event_del(struct perf_event *event, int flags)
+{
+ struct arm_cmn *cmn = to_cmn(event->pmu);
+ struct arm_cmn_hw_event *hw = to_cmn_hw(event);
+ enum cmn_node_type type = CMN_EVENT_TYPE(event);
+
+ arm_cmn_event_stop(event, PERF_EF_UPDATE);
+
+ if (type == CMN_TYPE_DTC)
+ cmn->dtc[__ffs(hw->dtcs_used)].cycles = NULL;
+ else
+ arm_cmn_event_clear(cmn, event, hw->num_dns);
+}
+
+/*
+ * We stop the PMU for both add and read, to avoid skew across DTM counters.
+ * Ideally we might be able to use snapshots to read without stopping, but
+ * for some reason I can't get them to work as expected :(
+ */
+static void arm_cmn_start_txn(struct pmu *pmu, unsigned int flags)
+{
+ arm_cmn_set_state(to_cmn(pmu), CMN_STATE_TXN);
+}
+
+static void arm_cmn_end_txn(struct pmu *pmu)
+{
+ arm_cmn_clear_state(to_cmn(pmu), CMN_STATE_TXN);
+}
+
+static int arm_cmn_commit_txn(struct pmu *pmu)
+{
+ arm_cmn_end_txn(pmu);
+ return 0;
+}
+
+static int arm_cmn_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
+{
+ struct arm_cmn *cmn;
+ unsigned int target;
+
+ cmn = hlist_entry_safe(node, struct arm_cmn, cpuhp_node);
+ if (cpu != cmn->cpu)
+ return 0;
+
+ target = cpumask_any_but(cpu_online_mask, cpu);
+ if (target >= nr_cpu_ids)
+ return 0;
+
+ perf_pmu_migrate_context(&cmn->pmu, cpu, target);
+ cmn->cpu = target;
+ return 0;
+}
+
+static irqreturn_t arm_cmn_handle_irq(int irq, void *dev_id)
+{
+ struct arm_cmn_dtc *dtc = dev_id;
+ irqreturn_t ret = IRQ_NONE;
+
+ for (;;) {
+ u32 status = readl_relaxed(dtc->base + CMN_DT_PMOVSR);
+ u64 delta;
+ int i;
+
+ for (i = 0; i < CMN_DTM_NUM_COUNTERS; i++) {
+ if (status & (1U << i)) {
+ ret = IRQ_HANDLED;
+ if (WARN_ON(!dtc->counters[i]))
+ continue;
+ delta = (u64)arm_cmn_read_counter(dtc, i) << 16;
+ local64_add(delta, &dtc->counters[i]->count);
+ }
+ }
+
+ if (status & (1U << CMN_DT_NUM_COUNTERS)) {
+ ret = IRQ_HANDLED;
+ if (dtc->cc_active && !WARN_ON(!dtc->cycles)) {
+ delta = arm_cmn_read_cc(dtc);
+ local64_add(delta, &dtc->cycles->count);
+ }
+ }
+
+ writel_relaxed(status, dtc->base + CMN_DT_PMOVSR_CLR);
+
+ if (!dtc->irq_friend)
+ return ret;
+ dtc += dtc->irq_friend;
+ }
+}
+
+/* We can reasonably accommodate DTCs of the same CMN sharing IRQs */
+static int arm_cmn_init_irqs(struct arm_cmn *cmn)
+{
+ int i, j, irq, err;
+
+ for (i = 0; i < cmn->num_dtcs; i++) {
+ irq = cmn->dtc[i].irq;
+ for (j = i; j--; ) {
+ if (cmn->dtc[j].irq == irq) {
+ cmn->dtc[j].irq_friend = j - i;
+ goto next;
+ }
+ }
+ err = devm_request_irq(cmn->dev, irq, arm_cmn_handle_irq,
+ IRQF_NOBALANCING | IRQF_NO_THREAD,
+ dev_name(cmn->dev), &cmn->dtc[i]);
+ if (err)
+ return err;
+
+ err = irq_set_affinity_hint(irq, cpumask_of(cmn->cpu));
+ if (err)
+ return err;
+ next:
+ ; /* isn't C great? */
+ }
+ return 0;
+}
+
+static void arm_cmn_init_dtm(struct arm_cmn_node *xp)
+{
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ xp->wp_event[i] = -1;
+ writeq_relaxed(0, xp->pmu_base + CMN_DTM_WPn_MASK(i));
+ writeq_relaxed(~0ULL, xp->pmu_base + CMN_DTM_WPn_VAL(i));
+ }
+ xp->dtc = -1;
+}
+
+static int arm_cmn_init_dtc(struct arm_cmn *cmn, struct arm_cmn_node *dn, int idx)
+{
+ struct arm_cmn_dtc *dtc = cmn->dtc + idx;
+ struct arm_cmn_node *xp;
+
+ dtc->base = dn->pmu_base - CMN_PMU_OFFSET;
+ dtc->irq = platform_get_irq(to_platform_device(cmn->dev), idx);
+ if (dtc->irq < 0)
+ return dtc->irq;
+
+ writel_relaxed(0, dtc->base + CMN_DT_PMCR);
+ writel_relaxed(0x1ff, dtc->base + CMN_DT_PMOVSR_CLR);
+ writel_relaxed(CMN_DT_PMCR_OVFL_INTR_EN, dtc->base + CMN_DT_PMCR);
+
+ /* We do at least know that a DTC's XP must be in that DTC's domain */
+ xp = arm_cmn_node_to_xp(dn);
+ xp->dtc = idx;
+
+ return 0;
+}
+
+static int arm_cmn_node_cmp(const void *a, const void *b)
+{
+ const struct arm_cmn_node *dna = a, *dnb = b;
+ int cmp;
+
+ cmp = dna->type - dnb->type;
+ if (!cmp)
+ cmp = dna->logid - dnb->logid;
+ return cmp;
+}
+
+static int arm_cmn_init_dtcs(struct arm_cmn *cmn)
+{
+ struct arm_cmn_node *dn;
+ int dtc_idx = 0;
+
+ cmn->dtc = devm_kcalloc(cmn->dev, cmn->num_dtcs, sizeof(cmn->dtc[0]), GFP_KERNEL);
+ if (!cmn->dtc)
+ return -ENOMEM;
+
+ sort(cmn->dns, cmn->num_dns, sizeof(cmn->dns[0]), arm_cmn_node_cmp, NULL);
+
+ cmn->xps = arm_cmn_node(cmn, CMN_TYPE_XP);
+
+ for (dn = cmn->dns; dn < cmn->dns + cmn->num_dns; dn++) {
+ if (dn->type == CMN_TYPE_XP)
+ arm_cmn_init_dtm(dn);
+ else
+ arm_cmn_init_node_to_xp(cmn, dn);
+
+ if (dn->type == CMN_TYPE_DTC)
+ arm_cmn_init_dtc(cmn, dn, dtc_idx++);
+
+ /* To the PMU, RN-Ds don't add anything over RN-Is, so smoosh them together */
+ if (dn->type == CMN_TYPE_RND)
+ dn->type = CMN_TYPE_RNI;
+ }
+
+ writel_relaxed(CMN_DT_DTC_CTL_DT_EN, cmn->dtc[0].base + CMN_DT_DTC_CTL);
+
+ return 0;
+}
+
+static void arm_cmn_init_node_info(struct arm_cmn *cmn, u32 offset, struct arm_cmn_node *node)
+{
+ int level;
+ u64 reg = readq_relaxed(cmn->base + offset + CMN_NODE_INFO);
+
+ node->type = FIELD_GET(CMN_NI_NODE_TYPE, reg);
+ node->id = FIELD_GET(CMN_NI_NODE_ID, reg);
+ node->logid = FIELD_GET(CMN_NI_LOGICAL_ID, reg);
+
+ node->pmu_base = cmn->base + offset + CMN_PMU_OFFSET;
+
+ if (node->type == CMN_TYPE_CFG)
+ level = 0;
+ else if (node->type == CMN_TYPE_XP)
+ level = 1;
+ else
+ level = 2;
+
+ dev_dbg(cmn->dev, "node%*c%#06hx%*ctype:%-#6hx id:%-4hd off:%#x\n",
+ (level * 2) + 1, ' ', node->id, 5 - (level * 2), ' ',
+ node->type, node->logid, offset);
+}
+
+static int arm_cmn_discover(struct arm_cmn *cmn, unsigned int rgn_offset)
+{
+ void __iomem *cfg_region;
+ struct arm_cmn_node cfg, *dn;
+ u16 child_count, child_poff;
+ u32 xp_offset[CMN_MAX_XPS];
+ u64 reg;
+ int i, j;
+
+ cfg_region = cmn->base + rgn_offset;
+ reg = readl_relaxed(cfg_region + CMN_CFGM_PERIPH_ID_2);
+ cmn->rev = FIELD_GET(CMN_CFGM_PID2_REVISION, reg);
+ dev_dbg(cmn->dev, "periph_id_2 revision: %d\n", cmn->rev);
+
+ arm_cmn_init_node_info(cmn, rgn_offset, &cfg);
+ if (cfg.type != CMN_TYPE_CFG)
+ return -ENODEV;
+
+ reg = readq_relaxed(cfg_region + CMN_CHILD_INFO);
+ child_count = FIELD_GET(CMN_CI_CHILD_COUNT, reg);
+ child_poff = FIELD_GET(CMN_CI_CHILD_PTR_OFFSET, reg);
+
+ cmn->num_xps = child_count;
+ cmn->num_dns = cmn->num_xps;
+
+ /* Pass 1: visit the XPs, enumerate their children */
+ for (i = 0; i < cmn->num_xps; i++) {
+ reg = readq_relaxed(cfg_region + child_poff + i * 8);
+ xp_offset[i] = reg & CMN_CHILD_NODE_ADDR;
+
+ reg = readq_relaxed(cmn->base + xp_offset[i] + CMN_CHILD_INFO);
+ cmn->num_dns += FIELD_GET(CMN_CI_CHILD_COUNT, reg);
+ }
+
+ /* Cheeky +1 to help terminate pointer-based iteration */
+ cmn->dns = devm_kcalloc(cmn->dev, cmn->num_dns + 1,
+ sizeof(*cmn->dns), GFP_KERNEL);
+ if (!cmn->dns)
+ return -ENOMEM;
+
+ /* Pass 2: now we can actually populate the nodes */
+ dn = cmn->dns;
+ for (i = 0; i < cmn->num_xps; i++) {
+ void __iomem *xp_region = cmn->base + xp_offset[i];
+ struct arm_cmn_node *xp = dn++;
+
+ arm_cmn_init_node_info(cmn, xp_offset[i], xp);
+ xp->pmu_config_low = CMN_DTM_PMU_CONFIG_PMU_EN;
+ /*
+ * Thanks to the order in which XP logical IDs seem to be
+ * assigned, we can handily infer the mesh X dimension by
+ * looking out for the XP at (0,1) without needing to know
+ * the exact node ID format, which we can later derive.
+ */
+ if (xp->id == (1 << 3))
+ cmn->mesh_x = xp->logid;
+
+ reg = readq_relaxed(xp_region + CMN_CHILD_INFO);
+ child_count = FIELD_GET(CMN_CI_CHILD_COUNT, reg);
+ child_poff = FIELD_GET(CMN_CI_CHILD_PTR_OFFSET, reg);
+
+ for (j = 0; j < child_count; j++) {
+ reg = readq_relaxed(xp_region + child_poff + j * 8);
+ /*
+ * Don't even try to touch anything external, since in general
+ * we haven't a clue how to power up arbitrary CHI requesters.
+ * As of CMN-600r1 these could only be RN-SAMs or CXLAs,
+ * neither of which have any PMU events anyway.
+ * (Actually, CXLAs do seem to have grown some events in r1p2,
+ * but they don't go to regular XP DTMs, and they depend on
+ * secure configuration which we can't easily deal with)
+ */
+ if (reg & CMN_CHILD_NODE_EXTERNAL) {
+ dev_dbg(cmn->dev, "ignoring external node %llx\n", reg);
+ continue;
+ }
+
+ arm_cmn_init_node_info(cmn, reg & CMN_CHILD_NODE_ADDR, dn);
+
+ switch (dn->type) {
+ case CMN_TYPE_DTC:
+ cmn->num_dtcs++;
+ dn++;
+ break;
+ /* These guys have PMU events */
+ case CMN_TYPE_DVM:
+ case CMN_TYPE_HNI:
+ case CMN_TYPE_HNF:
+ case CMN_TYPE_SBSX:
+ case CMN_TYPE_RNI:
+ case CMN_TYPE_RND:
+ case CMN_TYPE_CXRA:
+ case CMN_TYPE_CXHA:
+ dn++;
+ break;
+ /* Nothing to see here */
+ case CMN_TYPE_RNSAM:
+ case CMN_TYPE_CXLA:
+ break;
+ /* Something has gone horribly wrong */
+ default:
+ dev_err(cmn->dev, "invalid device node type: 0x%hx\n", dn->type);
+ return -ENODEV;
+ }
+ }
+ }
+
+ /* Correct for any nodes we skipped */
+ cmn->num_dns = dn - cmn->dns;
+
+ /*
+ * If mesh_x wasn't set during discovery then we never saw
+ * an XP at (0,1), thus we must have an Nx1 configuration.
+ */
+ if (!cmn->mesh_x)
+ cmn->mesh_x = cmn->num_xps;
+ cmn->mesh_y = cmn->num_xps / cmn->mesh_x;
+
+ dev_dbg(cmn->dev, "mesh %dx%d, ID width %d\n",
+ cmn->mesh_x, cmn->mesh_y, arm_cmn_xyidbits(cmn));
+
+ return 0;
+}
+
+/* There is no guarantee that this will work... */
+static int arm_cmn_get_root_node(struct arm_cmn *cmn)
+{
+ int offset;
+ u64 reg;
+
+ dev_warn(cmn->dev, "Unknown root node! Trying to probe address space...\n");
+
+ for (offset = 0; offset < SZ_64M; offset += SZ_16K) {
+ reg = readq_relaxed(cmn->base + offset + CMN_NODE_INFO);
+ if (FIELD_GET(CMN_NI_NODE_TYPE, reg) == CMN_TYPE_CFG)
+ return offset;
+ }
+
+ return -ENODEV;
+}
+
+static int arm_cmn_acpi_probe(struct platform_device *pdev, struct arm_cmn *cmn)
+{
+ struct resource *cfg, *root;
+
+ cfg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!cfg)
+ return -EINVAL;
+
+ root = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!root)
+ return -EINVAL;
+
+ if (!resource_contains(cfg, root))
+ swap(cfg, root);
+ /*
+ * Note that devm_ioremap_resource() is dumb and won't let the platform
+ * device claim cfg when the ACPI companion device has already claimed
+ * root within it. But since they *are* already both claimed in the
+ * appropriate name, we don't really need to do it again here anyway.
+ */
+ cmn->base = devm_ioremap(cmn->dev, cfg->start, resource_size(cfg));
+ if (!cmn->base)
+ return -ENOMEM;
+
+ return root->start - cfg->start;
+}
+
+static int arm_cmn_of_probe(struct platform_device *pdev, struct arm_cmn *cmn)
+{
+ struct device_node *np = pdev->dev.of_node;
+ u32 rootnode;
+
+ cmn->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(cmn->base))
+ return PTR_ERR(cmn->base);
+
+ if (of_property_read_u32(np, "arm,root-node", &rootnode))
+ return arm_cmn_get_root_node(cmn);
+
+ return rootnode;
+}
+
+static int arm_cmn_probe(struct platform_device *pdev)
+{
+ struct arm_cmn *cmn;
+ const char *name;
+ static atomic_t id;
+ int err, rootnode;
+
+ cmn = devm_kzalloc(&pdev->dev, sizeof(*cmn), GFP_KERNEL);
+ if (!cmn)
+ return -ENOMEM;
+
+ cmn->dev = &pdev->dev;
+ platform_set_drvdata(pdev, cmn);
+
+ if (has_acpi_companion(cmn->dev))
+ rootnode = arm_cmn_acpi_probe(pdev, cmn);
+ else
+ rootnode = arm_cmn_of_probe(pdev, cmn);
+ if (rootnode < 0)
+ return rootnode;
+
+ err = arm_cmn_discover(cmn, rootnode);
+ if (err)
+ return err;
+
+ err = arm_cmn_init_dtcs(cmn);
+ if (err)
+ return err;
+
+ err = arm_cmn_init_irqs(cmn);
+ if (err)
+ return err;
+
+ cmn->cpu = raw_smp_processor_id();
+ cmn->pmu = (struct pmu) {
+ .module = THIS_MODULE,
+ .attr_groups = arm_cmn_attr_groups,
+ .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
+ .task_ctx_nr = perf_invalid_context,
+ .pmu_enable = arm_cmn_pmu_enable,
+ .pmu_disable = arm_cmn_pmu_disable,
+ .event_init = arm_cmn_event_init,
+ .add = arm_cmn_event_add,
+ .del = arm_cmn_event_del,
+ .start = arm_cmn_event_start,
+ .stop = arm_cmn_event_stop,
+ .read = arm_cmn_event_read,
+ .start_txn = arm_cmn_start_txn,
+ .commit_txn = arm_cmn_commit_txn,
+ .cancel_txn = arm_cmn_end_txn,
+ };
+
+ if (atomic_fetch_inc(&id) == 0) {
+ name = "arm_cmn";
+ } else {
+ name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", atomic_read(&id));
+ if (!name)
+ return -ENOMEM;
+ }
+
+ err = cpuhp_state_add_instance(arm_cmn_hp_state, &cmn->cpuhp_node);
+ if (err)
+ return err;
+
+ err = perf_pmu_register(&cmn->pmu, name, -1);
+ if (err)
+ cpuhp_state_remove_instance(arm_cmn_hp_state, &cmn->cpuhp_node);
+ return err;
+}
+
+static int arm_cmn_remove(struct platform_device *pdev)
+{
+ struct arm_cmn *cmn = platform_get_drvdata(pdev);
+ int i;
+
+ writel_relaxed(0, cmn->dtc[0].base + CMN_DT_DTC_CTL);
+
+ perf_pmu_unregister(&cmn->pmu);
+ cpuhp_state_remove_instance(arm_cmn_hp_state, &cmn->cpuhp_node);
+
+ for (i = 0; i < cmn->num_dtcs; i++)
+ irq_set_affinity_hint(cmn->dtc[i].irq, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id arm_cmn_of_match[] = {
+ { .compatible = "arm,cmn-600", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, arm_cmn_of_match);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id arm_cmn_acpi_match[] = {
+ { "ARMHC600", },
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, arm_cmn_acpi_match);
+#endif
+
+static struct platform_driver arm_cmn_driver = {
+ .driver = {
+ .name = "arm-cmn",
+ .of_match_table = of_match_ptr(arm_cmn_of_match),
+ .acpi_match_table = ACPI_PTR(arm_cmn_acpi_match),
+ },
+ .probe = arm_cmn_probe,
+ .remove = arm_cmn_remove,
+};
+
+static int __init arm_cmn_init(void)
+{
+ int ret;
+
+ ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
+ "perf/arm/cmn:online", NULL,
+ arm_cmn_pmu_offline_cpu);
+ if (ret < 0)
+ return ret;
+
+ arm_cmn_hp_state = ret;
+ ret = platform_driver_register(&arm_cmn_driver);
+ if (ret)
+ cpuhp_remove_multi_state(arm_cmn_hp_state);
+ return ret;
+}
+
+static void __exit arm_cmn_exit(void)
+{
+ platform_driver_unregister(&arm_cmn_driver);
+ cpuhp_remove_multi_state(arm_cmn_hp_state);
+}
+
+module_init(arm_cmn_init);
+module_exit(arm_cmn_exit);
+
+MODULE_AUTHOR("Robin Murphy <robin.murphy@xxxxxxx>");
+MODULE_DESCRIPTION("Arm CMN-600 PMU driver");
+MODULE_LICENSE("GPL v2");
--
2.28.0.dirty
