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linux/drivers/perf/arm-cmn.c
Tuan Phan 4e16f283ed perf/arm-cmn: Fix invalid pointer when access dtc object sharing the same IRQ number 
When multiple dtcs share the same IRQ number, the irq_friend which
used to refer to dtc object gets calculated incorrect which leads
to invalid pointer.

Fixes: 0ba64770a2 ("perf: Add Arm CMN-600 PMU driver")

Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/1623946129-3290-1-git-send-email-tuanphan@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
2021-06-17 19:45:02 +01:00

1634 lines
44 KiB
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// 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;
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 sysfs_emit(buf, "type=0x%x\n", eattr->type);
if (eattr->type == CMN_TYPE_WP)
return sysfs_emit(buf,
"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 sysfs_emit(buf, "type=0x%x,eventid=0x%x,occupid=0x%x\n",
eattr->type, eattr->eventid, eattr->occupid);
return sysfs_emit(buf, "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 sysfs_emit(buf, "config:%d\n", lo);
if (!fmt->config)
return sysfs_emit(buf, "config:%d-%d\n", lo, hi);
return sysfs_emit(buf, "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 const 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.
* In theory we could use snapshots to read without stopping, but then it
* becomes a lot trickier to deal with overlow and racing against interrupts,
* plus it seems they don't work properly on some hardware anyway :(
*/
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 i, 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);
for (i = 0; i < cmn->num_dtcs; i++)
irq_set_affinity(cmn->dtc[i].irq, cpumask_of(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 = i - j;
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(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->pmu_config_low = CMN_DTM_PMU_CONFIG_PMU_EN;
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_node_to_xp(cmn, dn);
else if (cmn->num_dtcs == 1)
dn->dtc = 0;
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:%-#6x 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);
arm_cmn_init_dtm(xp);
/*
* 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%x\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;
}
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;
int ret;
cmn->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(cmn->base))
return PTR_ERR(cmn->base);
ret = of_property_read_u32(np, "arm,root-node", &rootnode);
if (ret)
return ret;
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,
};
name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", atomic_fetch_inc(&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);
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);
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@arm.com>");
MODULE_DESCRIPTION("Arm CMN-600 PMU driver");
MODULE_LICENSE("GPL v2");
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