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WSL2-Linux-Kernel/drivers/bus/arm-cci.c

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38 KiB
C
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/*
* CCI cache coherent interconnect driver
*
* Copyright (C) 2013 ARM Ltd.
* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/arm-cci.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
static void __iomem *cci_ctrl_base;
static unsigned long cci_ctrl_phys;
#ifdef CONFIG_ARM_CCI400_PORT_CTRL
struct cci_nb_ports {
unsigned int nb_ace;
unsigned int nb_ace_lite;
};
static const struct cci_nb_ports cci400_ports = {
.nb_ace = 2,
.nb_ace_lite = 3
};
#define CCI400_PORTS_DATA (&cci400_ports)
#else
#define CCI400_PORTS_DATA (NULL)
#endif
static const struct of_device_id arm_cci_matches[] = {
#ifdef CONFIG_ARM_CCI400_COMMON
{.compatible = "arm,cci-400", .data = CCI400_PORTS_DATA },
#endif
{},
};
#ifdef CONFIG_ARM_CCI400_PMU
#define DRIVER_NAME "CCI-400"
#define DRIVER_NAME_PMU DRIVER_NAME " PMU"
#define CCI_PMCR 0x0100
#define CCI_PID2 0x0fe8
#define CCI_PMCR_CEN 0x00000001
#define CCI_PMCR_NCNT_MASK 0x0000f800
#define CCI_PMCR_NCNT_SHIFT 11
#define CCI_PID2_REV_MASK 0xf0
#define CCI_PID2_REV_SHIFT 4
#define CCI_PMU_EVT_SEL 0x000
#define CCI_PMU_CNTR 0x004
#define CCI_PMU_CNTR_CTRL 0x008
#define CCI_PMU_OVRFLW 0x00c
#define CCI_PMU_OVRFLW_FLAG 1
#define CCI_PMU_CNTR_BASE(idx) ((idx) * SZ_4K)
#define CCI_PMU_CNTR_MASK ((1ULL << 32) -1)
#define CCI_PMU_EVENT_MASK 0xffUL
#define CCI_PMU_EVENT_SOURCE(event) ((event >> 5) & 0x7)
#define CCI_PMU_EVENT_CODE(event) (event & 0x1f)
#define CCI_PMU_MAX_HW_EVENTS 5 /* CCI PMU has 4 counters + 1 cycle counter */
/* Types of interfaces that can generate events */
enum {
CCI_IF_SLAVE,
CCI_IF_MASTER,
CCI_IF_MAX,
};
struct event_range {
u32 min;
u32 max;
};
struct cci_pmu_hw_events {
struct perf_event *events[CCI_PMU_MAX_HW_EVENTS];
unsigned long used_mask[BITS_TO_LONGS(CCI_PMU_MAX_HW_EVENTS)];
raw_spinlock_t pmu_lock;
};
struct cci_pmu_model {
char *name;
struct event_range event_ranges[CCI_IF_MAX];
};
static struct cci_pmu_model cci_pmu_models[];
struct cci_pmu {
void __iomem *base;
struct pmu pmu;
int nr_irqs;
int irqs[CCI_PMU_MAX_HW_EVENTS];
unsigned long active_irqs;
const struct cci_pmu_model *model;
struct cci_pmu_hw_events hw_events;
struct platform_device *plat_device;
int num_events;
atomic_t active_events;
struct mutex reserve_mutex;
cpumask_t cpus;
};
static struct cci_pmu *pmu;
#define to_cci_pmu(c) (container_of(c, struct cci_pmu, pmu))
/* Port ids */
#define CCI_PORT_S0 0
#define CCI_PORT_S1 1
#define CCI_PORT_S2 2
#define CCI_PORT_S3 3
#define CCI_PORT_S4 4
#define CCI_PORT_M0 5
#define CCI_PORT_M1 6
#define CCI_PORT_M2 7
#define CCI_REV_R0 0
#define CCI_REV_R1 1
#define CCI_REV_R1_PX 5
/*
* Instead of an event id to monitor CCI cycles, a dedicated counter is
* provided. Use 0xff to represent CCI cycles and hope that no future revisions
* make use of this event in hardware.
*/
enum cci400_perf_events {
CCI_PMU_CYCLES = 0xff
};
#define CCI_PMU_CYCLE_CNTR_IDX 0
#define CCI_PMU_CNTR0_IDX 1
#define CCI_PMU_CNTR_LAST(cci_pmu) (CCI_PMU_CYCLE_CNTR_IDX + cci_pmu->num_events - 1)
/*
* CCI PMU event id is an 8-bit value made of two parts - bits 7:5 for one of 8
* ports and bits 4:0 are event codes. There are different event codes
* associated with each port type.
*
* Additionally, the range of events associated with the port types changed
* between Rev0 and Rev1.
*
* The constants below define the range of valid codes for each port type for
* the different revisions and are used to validate the event to be monitored.
*/
#define CCI_REV_R0_SLAVE_PORT_MIN_EV 0x00
#define CCI_REV_R0_SLAVE_PORT_MAX_EV 0x13
#define CCI_REV_R0_MASTER_PORT_MIN_EV 0x14
#define CCI_REV_R0_MASTER_PORT_MAX_EV 0x1a
#define CCI_REV_R1_SLAVE_PORT_MIN_EV 0x00
#define CCI_REV_R1_SLAVE_PORT_MAX_EV 0x14
#define CCI_REV_R1_MASTER_PORT_MIN_EV 0x00
#define CCI_REV_R1_MASTER_PORT_MAX_EV 0x11
static int pmu_validate_hw_event(unsigned long hw_event)
{
u8 ev_source = CCI_PMU_EVENT_SOURCE(hw_event);
u8 ev_code = CCI_PMU_EVENT_CODE(hw_event);
int if_type;
if (hw_event & ~CCI_PMU_EVENT_MASK)
return -ENOENT;
switch (ev_source) {
case CCI_PORT_S0:
case CCI_PORT_S1:
case CCI_PORT_S2:
case CCI_PORT_S3:
case CCI_PORT_S4:
/* Slave Interface */
if_type = CCI_IF_SLAVE;
break;
case CCI_PORT_M0:
case CCI_PORT_M1:
case CCI_PORT_M2:
/* Master Interface */
if_type = CCI_IF_MASTER;
break;
default:
return -ENOENT;
}
if (ev_code >= pmu->model->event_ranges[if_type].min &&
ev_code <= pmu->model->event_ranges[if_type].max)
return hw_event;
return -ENOENT;
}
static int probe_cci_revision(void)
{
int rev;
rev = readl_relaxed(cci_ctrl_base + CCI_PID2) & CCI_PID2_REV_MASK;
rev >>= CCI_PID2_REV_SHIFT;
if (rev < CCI_REV_R1_PX)
return CCI_REV_R0;
else
return CCI_REV_R1;
}
static const struct cci_pmu_model *probe_cci_model(struct platform_device *pdev)
{
if (platform_has_secure_cci_access())
return &cci_pmu_models[probe_cci_revision()];
return NULL;
}
static int pmu_is_valid_counter(struct cci_pmu *cci_pmu, int idx)
{
return CCI_PMU_CYCLE_CNTR_IDX <= idx &&
idx <= CCI_PMU_CNTR_LAST(cci_pmu);
}
static u32 pmu_read_register(int idx, unsigned int offset)
{
return readl_relaxed(pmu->base + CCI_PMU_CNTR_BASE(idx) + offset);
}
static void pmu_write_register(u32 value, int idx, unsigned int offset)
{
return writel_relaxed(value, pmu->base + CCI_PMU_CNTR_BASE(idx) + offset);
}
static void pmu_disable_counter(int idx)
{
pmu_write_register(0, idx, CCI_PMU_CNTR_CTRL);
}
static void pmu_enable_counter(int idx)
{
pmu_write_register(1, idx, CCI_PMU_CNTR_CTRL);
}
static void pmu_set_event(int idx, unsigned long event)
{
pmu_write_register(event, idx, CCI_PMU_EVT_SEL);
}
static u32 pmu_get_max_counters(void)
{
u32 n_cnts = (readl_relaxed(cci_ctrl_base + CCI_PMCR) &
CCI_PMCR_NCNT_MASK) >> CCI_PMCR_NCNT_SHIFT;
/* add 1 for cycle counter */
return n_cnts + 1;
}
static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct hw_perf_event *hw_event = &event->hw;
unsigned long cci_event = hw_event->config_base;
int idx;
if (cci_event == CCI_PMU_CYCLES) {
if (test_and_set_bit(CCI_PMU_CYCLE_CNTR_IDX, hw->used_mask))
return -EAGAIN;
return CCI_PMU_CYCLE_CNTR_IDX;
}
for (idx = CCI_PMU_CNTR0_IDX; idx <= CCI_PMU_CNTR_LAST(cci_pmu); ++idx)
if (!test_and_set_bit(idx, hw->used_mask))
return idx;
/* No counters available */
return -EAGAIN;
}
static int pmu_map_event(struct perf_event *event)
{
int mapping;
unsigned long config = event->attr.config;
if (event->attr.type < PERF_TYPE_MAX)
return -ENOENT;
if (config == CCI_PMU_CYCLES)
mapping = config;
else
mapping = pmu_validate_hw_event(config);
return mapping;
}
static int pmu_request_irq(struct cci_pmu *cci_pmu, irq_handler_t handler)
{
int i;
struct platform_device *pmu_device = cci_pmu->plat_device;
if (unlikely(!pmu_device))
return -ENODEV;
if (pmu->nr_irqs < 1) {
dev_err(&pmu_device->dev, "no irqs for CCI PMUs defined\n");
return -ENODEV;
}
/*
* Register all available CCI PMU interrupts. In the interrupt handler
* we iterate over the counters checking for interrupt source (the
* overflowing counter) and clear it.
*
* This should allow handling of non-unique interrupt for the counters.
*/
for (i = 0; i < pmu->nr_irqs; i++) {
int err = request_irq(pmu->irqs[i], handler, IRQF_SHARED,
"arm-cci-pmu", cci_pmu);
if (err) {
dev_err(&pmu_device->dev, "unable to request IRQ%d for ARM CCI PMU counters\n",
pmu->irqs[i]);
return err;
}
set_bit(i, &pmu->active_irqs);
}
return 0;
}
static void pmu_free_irq(struct cci_pmu *cci_pmu)
{
int i;
for (i = 0; i < pmu->nr_irqs; i++) {
if (!test_and_clear_bit(i, &pmu->active_irqs))
continue;
free_irq(pmu->irqs[i], cci_pmu);
}
}
static u32 pmu_read_counter(struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct hw_perf_event *hw_counter = &event->hw;
int idx = hw_counter->idx;
u32 value;
if (unlikely(!pmu_is_valid_counter(cci_pmu, idx))) {
dev_err(&cci_pmu->plat_device->dev, "Invalid CCI PMU counter %d\n", idx);
return 0;
}
value = pmu_read_register(idx, CCI_PMU_CNTR);
return value;
}
static void pmu_write_counter(struct perf_event *event, u32 value)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct hw_perf_event *hw_counter = &event->hw;
int idx = hw_counter->idx;
if (unlikely(!pmu_is_valid_counter(cci_pmu, idx)))
dev_err(&cci_pmu->plat_device->dev, "Invalid CCI PMU counter %d\n", idx);
else
pmu_write_register(value, idx, CCI_PMU_CNTR);
}
static u64 pmu_event_update(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
u64 delta, prev_raw_count, new_raw_count;
do {
prev_raw_count = local64_read(&hwc->prev_count);
new_raw_count = pmu_read_counter(event);
} while (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
new_raw_count) != prev_raw_count);
delta = (new_raw_count - prev_raw_count) & CCI_PMU_CNTR_MASK;
local64_add(delta, &event->count);
return new_raw_count;
}
static void pmu_read(struct perf_event *event)
{
pmu_event_update(event);
}
void pmu_event_set_period(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
/*
* The CCI PMU counters have a period of 2^32. To account for the
* possiblity of extreme interrupt latency we program for a period of
* half that. Hopefully we can handle the interrupt before another 2^31
* events occur and the counter overtakes its previous value.
*/
u64 val = 1ULL << 31;
local64_set(&hwc->prev_count, val);
pmu_write_counter(event, val);
}
static irqreturn_t pmu_handle_irq(int irq_num, void *dev)
{
unsigned long flags;
struct cci_pmu *cci_pmu = dev;
struct cci_pmu_hw_events *events = &pmu->hw_events;
int idx, handled = IRQ_NONE;
raw_spin_lock_irqsave(&events->pmu_lock, flags);
/*
* Iterate over counters and update the corresponding perf events.
* This should work regardless of whether we have per-counter overflow
* interrupt or a combined overflow interrupt.
*/
for (idx = CCI_PMU_CYCLE_CNTR_IDX; idx <= CCI_PMU_CNTR_LAST(cci_pmu); idx++) {
struct perf_event *event = events->events[idx];
struct hw_perf_event *hw_counter;
if (!event)
continue;
hw_counter = &event->hw;
/* Did this counter overflow? */
if (!(pmu_read_register(idx, CCI_PMU_OVRFLW) &
CCI_PMU_OVRFLW_FLAG))
continue;
pmu_write_register(CCI_PMU_OVRFLW_FLAG, idx, CCI_PMU_OVRFLW);
pmu_event_update(event);
pmu_event_set_period(event);
handled = IRQ_HANDLED;
}
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
return IRQ_RETVAL(handled);
}
static int cci_pmu_get_hw(struct cci_pmu *cci_pmu)
{
int ret = pmu_request_irq(cci_pmu, pmu_handle_irq);
if (ret) {
pmu_free_irq(cci_pmu);
return ret;
}
return 0;
}
static void cci_pmu_put_hw(struct cci_pmu *cci_pmu)
{
pmu_free_irq(cci_pmu);
}
static void hw_perf_event_destroy(struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
atomic_t *active_events = &cci_pmu->active_events;
struct mutex *reserve_mutex = &cci_pmu->reserve_mutex;
if (atomic_dec_and_mutex_lock(active_events, reserve_mutex)) {
cci_pmu_put_hw(cci_pmu);
mutex_unlock(reserve_mutex);
}
}
static void cci_pmu_enable(struct pmu *pmu)
{
struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
int enabled = bitmap_weight(hw_events->used_mask, cci_pmu->num_events);
unsigned long flags;
u32 val;
if (!enabled)
return;
raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
/* Enable all the PMU counters. */
val = readl_relaxed(cci_ctrl_base + CCI_PMCR) | CCI_PMCR_CEN;
writel(val, cci_ctrl_base + CCI_PMCR);
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}
static void cci_pmu_disable(struct pmu *pmu)
{
struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
/* Disable all the PMU counters. */
val = readl_relaxed(cci_ctrl_base + CCI_PMCR) & ~CCI_PMCR_CEN;
writel(val, cci_ctrl_base + CCI_PMCR);
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}
static void cci_pmu_start(struct perf_event *event, int pmu_flags)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
unsigned long flags;
/*
* To handle interrupt latency, we always reprogram the period
* regardlesss of PERF_EF_RELOAD.
*/
if (pmu_flags & PERF_EF_RELOAD)
WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
hwc->state = 0;
if (unlikely(!pmu_is_valid_counter(cci_pmu, idx))) {
dev_err(&cci_pmu->plat_device->dev, "Invalid CCI PMU counter %d\n", idx);
return;
}
raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
/* Configure the event to count, unless you are counting cycles */
if (idx != CCI_PMU_CYCLE_CNTR_IDX)
pmu_set_event(idx, hwc->config_base);
pmu_event_set_period(event);
pmu_enable_counter(idx);
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}
static void cci_pmu_stop(struct perf_event *event, int pmu_flags)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
if (hwc->state & PERF_HES_STOPPED)
return;
if (unlikely(!pmu_is_valid_counter(cci_pmu, idx))) {
dev_err(&cci_pmu->plat_device->dev, "Invalid CCI PMU counter %d\n", idx);
return;
}
/*
* We always reprogram the counter, so ignore PERF_EF_UPDATE. See
* cci_pmu_start()
*/
pmu_disable_counter(idx);
pmu_event_update(event);
hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
}
static int cci_pmu_add(struct perf_event *event, int flags)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
struct hw_perf_event *hwc = &event->hw;
int idx;
int err = 0;
perf_pmu_disable(event->pmu);
/* If we don't have a space for the counter then finish early. */
idx = pmu_get_event_idx(hw_events, event);
if (idx < 0) {
err = idx;
goto out;
}
event->hw.idx = idx;
hw_events->events[idx] = event;
hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
if (flags & PERF_EF_START)
cci_pmu_start(event, PERF_EF_RELOAD);
/* Propagate our changes to the userspace mapping. */
perf_event_update_userpage(event);
out:
perf_pmu_enable(event->pmu);
return err;
}
static void cci_pmu_del(struct perf_event *event, int flags)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
cci_pmu_stop(event, PERF_EF_UPDATE);
hw_events->events[idx] = NULL;
clear_bit(idx, hw_events->used_mask);
perf_event_update_userpage(event);
}
static int
validate_event(struct pmu *cci_pmu,
struct cci_pmu_hw_events *hw_events,
struct perf_event *event)
{
if (is_software_event(event))
return 1;
/*
* Reject groups spanning multiple HW PMUs (e.g. CPU + CCI). The
* core perf code won't check that the pmu->ctx == leader->ctx
* until after pmu->event_init(event).
*/
if (event->pmu != cci_pmu)
return 0;
if (event->state < PERF_EVENT_STATE_OFF)
return 1;
if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec)
return 1;
return pmu_get_event_idx(hw_events, event) >= 0;
}
static int
validate_group(struct perf_event *event)
{
struct perf_event *sibling, *leader = event->group_leader;
struct cci_pmu_hw_events fake_pmu = {
/*
* Initialise the fake PMU. We only need to populate the
* used_mask for the purposes of validation.
*/
.used_mask = { 0 },
};
if (!validate_event(event->pmu, &fake_pmu, leader))
return -EINVAL;
list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
if (!validate_event(event->pmu, &fake_pmu, sibling))
return -EINVAL;
}
if (!validate_event(event->pmu, &fake_pmu, event))
return -EINVAL;
return 0;
}
static int
__hw_perf_event_init(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
int mapping;
mapping = pmu_map_event(event);
if (mapping < 0) {
pr_debug("event %x:%llx not supported\n", event->attr.type,
event->attr.config);
return mapping;
}
/*
* We don't assign an index until we actually place the event onto
* hardware. Use -1 to signify that we haven't decided where to put it
* yet.
*/
hwc->idx = -1;
hwc->config_base = 0;
hwc->config = 0;
hwc->event_base = 0;
/*
* Store the event encoding into the config_base field.
*/
hwc->config_base |= (unsigned long)mapping;
/*
* Limit the sample_period to half of the counter width. That way, the
* new counter value is far less likely to overtake the previous one
* unless you have some serious IRQ latency issues.
*/
hwc->sample_period = CCI_PMU_CNTR_MASK >> 1;
hwc->last_period = hwc->sample_period;
local64_set(&hwc->period_left, hwc->sample_period);
if (event->group_leader != event) {
if (validate_group(event) != 0)
return -EINVAL;
}
return 0;
}
static int cci_pmu_event_init(struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
atomic_t *active_events = &cci_pmu->active_events;
int err = 0;
int cpu;
if (event->attr.type != event->pmu->type)
return -ENOENT;
/* Shared by all CPUs, no meaningful state to sample */
if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
return -EOPNOTSUPP;
/* We have no filtering of any kind */
if (event->attr.exclude_user ||
event->attr.exclude_kernel ||
event->attr.exclude_hv ||
event->attr.exclude_idle ||
event->attr.exclude_host ||
event->attr.exclude_guest)
return -EINVAL;
/*
* Following the example set by other "uncore" PMUs, we accept any CPU
* and rewrite its affinity dynamically rather than having perf core
* handle cpu == -1 and pid == -1 for this case.
*
* The perf core will pin online CPUs for the duration of this call and
* the event being installed into its context, so the PMU's CPU can't
* change under our feet.
*/
cpu = cpumask_first(&cci_pmu->cpus);
if (event->cpu < 0 || cpu < 0)
return -EINVAL;
event->cpu = cpu;
event->destroy = hw_perf_event_destroy;
if (!atomic_inc_not_zero(active_events)) {
mutex_lock(&cci_pmu->reserve_mutex);
if (atomic_read(active_events) == 0)
err = cci_pmu_get_hw(cci_pmu);
if (!err)
atomic_inc(active_events);
mutex_unlock(&cci_pmu->reserve_mutex);
}
if (err)
return err;
err = __hw_perf_event_init(event);
if (err)
hw_perf_event_destroy(event);
return err;
}
static ssize_t pmu_attr_cpumask_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
cpumask_pr_args(&pmu->cpus));
buf[n++] = '\n';
buf[n] = '\0';
return n;
}
static DEVICE_ATTR(cpumask, S_IRUGO, pmu_attr_cpumask_show, NULL);
static struct attribute *pmu_attrs[] = {
&dev_attr_cpumask.attr,
NULL,
};
static struct attribute_group pmu_attr_group = {
.attrs = pmu_attrs,
};
static const struct attribute_group *pmu_attr_groups[] = {
&pmu_attr_group,
NULL
};
static int cci_pmu_init(struct cci_pmu *cci_pmu, struct platform_device *pdev)
{
char *name = cci_pmu->model->name;
cci_pmu->pmu = (struct pmu) {
.name = cci_pmu->model->name,
.task_ctx_nr = perf_invalid_context,
.pmu_enable = cci_pmu_enable,
.pmu_disable = cci_pmu_disable,
.event_init = cci_pmu_event_init,
.add = cci_pmu_add,
.del = cci_pmu_del,
.start = cci_pmu_start,
.stop = cci_pmu_stop,
.read = pmu_read,
.attr_groups = pmu_attr_groups,
};
cci_pmu->plat_device = pdev;
cci_pmu->num_events = pmu_get_max_counters();
return perf_pmu_register(&cci_pmu->pmu, name, -1);
}
static int cci_pmu_cpu_notifier(struct notifier_block *self,
unsigned long action, void *hcpu)
{
unsigned int cpu = (long)hcpu;
unsigned int target;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_DOWN_PREPARE:
if (!cpumask_test_and_clear_cpu(cpu, &pmu->cpus))
break;
target = cpumask_any_but(cpu_online_mask, cpu);
if (target < 0) // UP, last CPU
break;
/*
* TODO: migrate context once core races on event->ctx have
* been fixed.
*/
cpumask_set_cpu(target, &pmu->cpus);
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block cci_pmu_cpu_nb = {
.notifier_call = cci_pmu_cpu_notifier,
/*
* to migrate uncore events, our notifier should be executed
* before perf core's notifier.
*/
.priority = CPU_PRI_PERF + 1,
};
static struct cci_pmu_model cci_pmu_models[] = {
[CCI_REV_R0] = {
.name = "CCI_400",
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI_REV_R0_SLAVE_PORT_MIN_EV,
CCI_REV_R0_SLAVE_PORT_MAX_EV,
},
[CCI_IF_MASTER] = {
CCI_REV_R0_MASTER_PORT_MIN_EV,
CCI_REV_R0_MASTER_PORT_MAX_EV,
},
},
},
[CCI_REV_R1] = {
.name = "CCI_400_r1",
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI_REV_R1_SLAVE_PORT_MIN_EV,
CCI_REV_R1_SLAVE_PORT_MAX_EV,
},
[CCI_IF_MASTER] = {
CCI_REV_R1_MASTER_PORT_MIN_EV,
CCI_REV_R1_MASTER_PORT_MAX_EV,
},
},
},
};
static const struct of_device_id arm_cci_pmu_matches[] = {
{
.compatible = "arm,cci-400-pmu",
.data = NULL,
},
{
.compatible = "arm,cci-400-pmu,r0",
.data = &cci_pmu_models[CCI_REV_R0],
},
{
.compatible = "arm,cci-400-pmu,r1",
.data = &cci_pmu_models[CCI_REV_R1],
},
{},
};
static inline const struct cci_pmu_model *get_cci_model(struct platform_device *pdev)
{
const struct of_device_id *match = of_match_node(arm_cci_pmu_matches,
pdev->dev.of_node);
if (!match)
return NULL;
if (match->data)
return match->data;
dev_warn(&pdev->dev, "DEPRECATED compatible property,"
"requires secure access to CCI registers");
return probe_cci_model(pdev);
}
static bool is_duplicate_irq(int irq, int *irqs, int nr_irqs)
{
int i;
for (i = 0; i < nr_irqs; i++)
if (irq == irqs[i])
return true;
return false;
}
static int cci_pmu_probe(struct platform_device *pdev)
{
struct resource *res;
int i, ret, irq;
const struct cci_pmu_model *model;
model = get_cci_model(pdev);
if (!model) {
dev_warn(&pdev->dev, "CCI PMU version not supported\n");
return -ENODEV;
}
pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL);
if (!pmu)
return -ENOMEM;
pmu->model = model;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pmu->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pmu->base))
return -ENOMEM;
/*
* CCI PMU has 5 overflow signals - one per counter; but some may be tied
* together to a common interrupt.
*/
pmu->nr_irqs = 0;
for (i = 0; i < CCI_PMU_MAX_HW_EVENTS; i++) {
irq = platform_get_irq(pdev, i);
if (irq < 0)
break;
if (is_duplicate_irq(irq, pmu->irqs, pmu->nr_irqs))
continue;
pmu->irqs[pmu->nr_irqs++] = irq;
}
/*
* Ensure that the device tree has as many interrupts as the number
* of counters.
*/
if (i < CCI_PMU_MAX_HW_EVENTS) {
dev_warn(&pdev->dev, "In-correct number of interrupts: %d, should be %d\n",
i, CCI_PMU_MAX_HW_EVENTS);
return -EINVAL;
}
raw_spin_lock_init(&pmu->hw_events.pmu_lock);
mutex_init(&pmu->reserve_mutex);
atomic_set(&pmu->active_events, 0);
cpumask_set_cpu(smp_processor_id(), &pmu->cpus);
ret = register_cpu_notifier(&cci_pmu_cpu_nb);
if (ret)
return ret;
ret = cci_pmu_init(pmu, pdev);
if (ret)
return ret;
pr_info("ARM %s PMU driver probed", pmu->model->name);
return 0;
}
static int cci_platform_probe(struct platform_device *pdev)
{
if (!cci_probed())
return -ENODEV;
return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
}
static struct platform_driver cci_pmu_driver = {
.driver = {
.name = DRIVER_NAME_PMU,
.of_match_table = arm_cci_pmu_matches,
},
.probe = cci_pmu_probe,
};
static struct platform_driver cci_platform_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = arm_cci_matches,
},
.probe = cci_platform_probe,
};
static int __init cci_platform_init(void)
{
int ret;
ret = platform_driver_register(&cci_pmu_driver);
if (ret)
return ret;
return platform_driver_register(&cci_platform_driver);
}
#else /* !CONFIG_ARM_CCI400_PMU */
static int __init cci_platform_init(void)
{
return 0;
}
#endif /* CONFIG_ARM_CCI400_PMU */
#ifdef CONFIG_ARM_CCI400_PORT_CTRL
#define CCI_PORT_CTRL 0x0
#define CCI_CTRL_STATUS 0xc
#define CCI_ENABLE_SNOOP_REQ 0x1
#define CCI_ENABLE_DVM_REQ 0x2
#define CCI_ENABLE_REQ (CCI_ENABLE_SNOOP_REQ | CCI_ENABLE_DVM_REQ)
enum cci_ace_port_type {
ACE_INVALID_PORT = 0x0,
ACE_PORT,
ACE_LITE_PORT,
};
struct cci_ace_port {
void __iomem *base;
unsigned long phys;
enum cci_ace_port_type type;
struct device_node *dn;
};
static struct cci_ace_port *ports;
static unsigned int nb_cci_ports;
struct cpu_port {
u64 mpidr;
u32 port;
};
/*
* Use the port MSB as valid flag, shift can be made dynamic
* by computing number of bits required for port indexes.
* Code disabling CCI cpu ports runs with D-cache invalidated
* and SCTLR bit clear so data accesses must be kept to a minimum
* to improve performance; for now shift is left static to
* avoid one more data access while disabling the CCI port.
*/
#define PORT_VALID_SHIFT 31
#define PORT_VALID (0x1 << PORT_VALID_SHIFT)
static inline void init_cpu_port(struct cpu_port *port, u32 index, u64 mpidr)
{
port->port = PORT_VALID | index;
port->mpidr = mpidr;
}
static inline bool cpu_port_is_valid(struct cpu_port *port)
{
return !!(port->port & PORT_VALID);
}
static inline bool cpu_port_match(struct cpu_port *port, u64 mpidr)
{
return port->mpidr == (mpidr & MPIDR_HWID_BITMASK);
}
static struct cpu_port cpu_port[NR_CPUS];
/**
* __cci_ace_get_port - Function to retrieve the port index connected to
* a cpu or device.
*
* @dn: device node of the device to look-up
* @type: port type
*
* Return value:
* - CCI port index if success
* - -ENODEV if failure
*/
static int __cci_ace_get_port(struct device_node *dn, int type)
{
int i;
bool ace_match;
struct device_node *cci_portn;
cci_portn = of_parse_phandle(dn, "cci-control-port", 0);
for (i = 0; i < nb_cci_ports; i++) {
ace_match = ports[i].type == type;
if (ace_match && cci_portn == ports[i].dn)
return i;
}
return -ENODEV;
}
int cci_ace_get_port(struct device_node *dn)
{
return __cci_ace_get_port(dn, ACE_LITE_PORT);
}
EXPORT_SYMBOL_GPL(cci_ace_get_port);
static void cci_ace_init_ports(void)
{
int port, cpu;
struct device_node *cpun;
/*
* Port index look-up speeds up the function disabling ports by CPU,
* since the logical to port index mapping is done once and does
* not change after system boot.
* The stashed index array is initialized for all possible CPUs
* at probe time.
*/
for_each_possible_cpu(cpu) {
/* too early to use cpu->of_node */
cpun = of_get_cpu_node(cpu, NULL);
if (WARN(!cpun, "Missing cpu device node\n"))
continue;
port = __cci_ace_get_port(cpun, ACE_PORT);
if (port < 0)
continue;
init_cpu_port(&cpu_port[cpu], port, cpu_logical_map(cpu));
}
for_each_possible_cpu(cpu) {
WARN(!cpu_port_is_valid(&cpu_port[cpu]),
"CPU %u does not have an associated CCI port\n",
cpu);
}
}
/*
* Functions to enable/disable a CCI interconnect slave port
*
* They are called by low-level power management code to disable slave
* interfaces snoops and DVM broadcast.
* Since they may execute with cache data allocation disabled and
* after the caches have been cleaned and invalidated the functions provide
* no explicit locking since they may run with D-cache disabled, so normal
* cacheable kernel locks based on ldrex/strex may not work.
* Locking has to be provided by BSP implementations to ensure proper
* operations.
*/
/**
* cci_port_control() - function to control a CCI port
*
* @port: index of the port to setup
* @enable: if true enables the port, if false disables it
*/
static void notrace cci_port_control(unsigned int port, bool enable)
{
void __iomem *base = ports[port].base;
writel_relaxed(enable ? CCI_ENABLE_REQ : 0, base + CCI_PORT_CTRL);
/*
* This function is called from power down procedures
* and must not execute any instruction that might
* cause the processor to be put in a quiescent state
* (eg wfi). Hence, cpu_relax() can not be added to this
* read loop to optimize power, since it might hide possibly
* disruptive operations.
*/
while (readl_relaxed(cci_ctrl_base + CCI_CTRL_STATUS) & 0x1)
;
}
/**
* cci_disable_port_by_cpu() - function to disable a CCI port by CPU
* reference
*
* @mpidr: mpidr of the CPU whose CCI port should be disabled
*
* Disabling a CCI port for a CPU implies disabling the CCI port
* controlling that CPU cluster. Code disabling CPU CCI ports
* must make sure that the CPU running the code is the last active CPU
* in the cluster ie all other CPUs are quiescent in a low power state.
*
* Return:
* 0 on success
* -ENODEV on port look-up failure
*/
int notrace cci_disable_port_by_cpu(u64 mpidr)
{
int cpu;
bool is_valid;
for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
is_valid = cpu_port_is_valid(&cpu_port[cpu]);
if (is_valid && cpu_port_match(&cpu_port[cpu], mpidr)) {
cci_port_control(cpu_port[cpu].port, false);
return 0;
}
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(cci_disable_port_by_cpu);
/**
* cci_enable_port_for_self() - enable a CCI port for calling CPU
*
* Enabling a CCI port for the calling CPU implies enabling the CCI
* port controlling that CPU's cluster. Caller must make sure that the
* CPU running the code is the first active CPU in the cluster and all
* other CPUs are quiescent in a low power state or waiting for this CPU
* to complete the CCI initialization.
*
* Because this is called when the MMU is still off and with no stack,
* the code must be position independent and ideally rely on callee
* clobbered registers only. To achieve this we must code this function
* entirely in assembler.
*
* On success this returns with the proper CCI port enabled. In case of
* any failure this never returns as the inability to enable the CCI is
* fatal and there is no possible recovery at this stage.
*/
asmlinkage void __naked cci_enable_port_for_self(void)
{
asm volatile ("\n"
" .arch armv7-a\n"
" mrc p15, 0, r0, c0, c0, 5 @ get MPIDR value \n"
" and r0, r0, #"__stringify(MPIDR_HWID_BITMASK)" \n"
" adr r1, 5f \n"
" ldr r2, [r1] \n"
" add r1, r1, r2 @ &cpu_port \n"
" add ip, r1, %[sizeof_cpu_port] \n"
/* Loop over the cpu_port array looking for a matching MPIDR */
"1: ldr r2, [r1, %[offsetof_cpu_port_mpidr_lsb]] \n"
" cmp r2, r0 @ compare MPIDR \n"
" bne 2f \n"
/* Found a match, now test port validity */
" ldr r3, [r1, %[offsetof_cpu_port_port]] \n"
" tst r3, #"__stringify(PORT_VALID)" \n"
" bne 3f \n"
/* no match, loop with the next cpu_port entry */
"2: add r1, r1, %[sizeof_struct_cpu_port] \n"
" cmp r1, ip @ done? \n"
" blo 1b \n"
/* CCI port not found -- cheaply try to stall this CPU */
"cci_port_not_found: \n"
" wfi \n"
" wfe \n"
" b cci_port_not_found \n"
/* Use matched port index to look up the corresponding ports entry */
"3: bic r3, r3, #"__stringify(PORT_VALID)" \n"
" adr r0, 6f \n"
" ldmia r0, {r1, r2} \n"
" sub r1, r1, r0 @ virt - phys \n"
" ldr r0, [r0, r2] @ *(&ports) \n"
" mov r2, %[sizeof_struct_ace_port] \n"
" mla r0, r2, r3, r0 @ &ports[index] \n"
" sub r0, r0, r1 @ virt_to_phys() \n"
/* Enable the CCI port */
" ldr r0, [r0, %[offsetof_port_phys]] \n"
" mov r3, %[cci_enable_req]\n"
" str r3, [r0, #"__stringify(CCI_PORT_CTRL)"] \n"
/* poll the status reg for completion */
" adr r1, 7f \n"
" ldr r0, [r1] \n"
" ldr r0, [r0, r1] @ cci_ctrl_base \n"
"4: ldr r1, [r0, #"__stringify(CCI_CTRL_STATUS)"] \n"
" tst r1, %[cci_control_status_bits] \n"
" bne 4b \n"
" mov r0, #0 \n"
" bx lr \n"
" .align 2 \n"
"5: .word cpu_port - . \n"
"6: .word . \n"
" .word ports - 6b \n"
"7: .word cci_ctrl_phys - . \n"
: :
[sizeof_cpu_port] "i" (sizeof(cpu_port)),
[cci_enable_req] "i" cpu_to_le32(CCI_ENABLE_REQ),
[cci_control_status_bits] "i" cpu_to_le32(1),
#ifndef __ARMEB__
[offsetof_cpu_port_mpidr_lsb] "i" (offsetof(struct cpu_port, mpidr)),
#else
[offsetof_cpu_port_mpidr_lsb] "i" (offsetof(struct cpu_port, mpidr)+4),
#endif
[offsetof_cpu_port_port] "i" (offsetof(struct cpu_port, port)),
[sizeof_struct_cpu_port] "i" (sizeof(struct cpu_port)),
[sizeof_struct_ace_port] "i" (sizeof(struct cci_ace_port)),
[offsetof_port_phys] "i" (offsetof(struct cci_ace_port, phys)) );
unreachable();
}
/**
* __cci_control_port_by_device() - function to control a CCI port by device
* reference
*
* @dn: device node pointer of the device whose CCI port should be
* controlled
* @enable: if true enables the port, if false disables it
*
* Return:
* 0 on success
* -ENODEV on port look-up failure
*/
int notrace __cci_control_port_by_device(struct device_node *dn, bool enable)
{
int port;
if (!dn)
return -ENODEV;
port = __cci_ace_get_port(dn, ACE_LITE_PORT);
if (WARN_ONCE(port < 0, "node %s ACE lite port look-up failure\n",
dn->full_name))
return -ENODEV;
cci_port_control(port, enable);
return 0;
}
EXPORT_SYMBOL_GPL(__cci_control_port_by_device);
/**
* __cci_control_port_by_index() - function to control a CCI port by port index
*
* @port: port index previously retrieved with cci_ace_get_port()
* @enable: if true enables the port, if false disables it
*
* Return:
* 0 on success
* -ENODEV on port index out of range
* -EPERM if operation carried out on an ACE PORT
*/
int notrace __cci_control_port_by_index(u32 port, bool enable)
{
if (port >= nb_cci_ports || ports[port].type == ACE_INVALID_PORT)
return -ENODEV;
/*
* CCI control for ports connected to CPUS is extremely fragile
* and must be made to go through a specific and controlled
* interface (ie cci_disable_port_by_cpu(); control by general purpose
* indexing is therefore disabled for ACE ports.
*/
if (ports[port].type == ACE_PORT)
return -EPERM;
cci_port_control(port, enable);
return 0;
}
EXPORT_SYMBOL_GPL(__cci_control_port_by_index);
static const struct of_device_id arm_cci_ctrl_if_matches[] = {
{.compatible = "arm,cci-400-ctrl-if", },
{},
};
static int cci_probe_ports(struct device_node *np)
{
struct cci_nb_ports const *cci_config;
int ret, i, nb_ace = 0, nb_ace_lite = 0;
struct device_node *cp;
struct resource res;
const char *match_str;
bool is_ace;
cci_config = of_match_node(arm_cci_matches, np)->data;
if (!cci_config)
return -ENODEV;
nb_cci_ports = cci_config->nb_ace + cci_config->nb_ace_lite;
ports = kcalloc(nb_cci_ports, sizeof(*ports), GFP_KERNEL);
if (!ports)
return -ENOMEM;
for_each_child_of_node(np, cp) {
if (!of_match_node(arm_cci_ctrl_if_matches, cp))
continue;
i = nb_ace + nb_ace_lite;
if (i >= nb_cci_ports)
break;
if (of_property_read_string(cp, "interface-type",
&match_str)) {
WARN(1, "node %s missing interface-type property\n",
cp->full_name);
continue;
}
is_ace = strcmp(match_str, "ace") == 0;
if (!is_ace && strcmp(match_str, "ace-lite")) {
WARN(1, "node %s containing invalid interface-type property, skipping it\n",
cp->full_name);
continue;
}
ret = of_address_to_resource(cp, 0, &res);
if (!ret) {
ports[i].base = ioremap(res.start, resource_size(&res));
ports[i].phys = res.start;
}
if (ret || !ports[i].base) {
WARN(1, "unable to ioremap CCI port %d\n", i);
continue;
}
if (is_ace) {
if (WARN_ON(nb_ace >= cci_config->nb_ace))
continue;
ports[i].type = ACE_PORT;
++nb_ace;
} else {
if (WARN_ON(nb_ace_lite >= cci_config->nb_ace_lite))
continue;
ports[i].type = ACE_LITE_PORT;
++nb_ace_lite;
}
ports[i].dn = cp;
}
/* initialize a stashed array of ACE ports to speed-up look-up */
cci_ace_init_ports();
/*
* Multi-cluster systems may need this data when non-coherent, during
* cluster power-up/power-down. Make sure it reaches main memory.
*/
sync_cache_w(&cci_ctrl_base);
sync_cache_w(&cci_ctrl_phys);
sync_cache_w(&ports);
sync_cache_w(&cpu_port);
__sync_cache_range_w(ports, sizeof(*ports) * nb_cci_ports);
pr_info("ARM CCI driver probed\n");
return 0;
}
#else /* !CONFIG_ARM_CCI400_PORT_CTRL */
static inline int cci_probe_ports(struct device_node *np)
{
return 0;
}
#endif /* CONFIG_ARM_CCI400_PORT_CTRL */
static int cci_probe(void)
{
int ret;
struct device_node *np;
struct resource res;
np = of_find_matching_node(NULL, arm_cci_matches);
if(!np || !of_device_is_available(np))
return -ENODEV;
ret = of_address_to_resource(np, 0, &res);
if (!ret) {
cci_ctrl_base = ioremap(res.start, resource_size(&res));
cci_ctrl_phys = res.start;
}
if (ret || !cci_ctrl_base) {
WARN(1, "unable to ioremap CCI ctrl\n");
return -ENXIO;
}
return cci_probe_ports(np);
}
static int cci_init_status = -EAGAIN;
static DEFINE_MUTEX(cci_probing);
static int cci_init(void)
{
if (cci_init_status != -EAGAIN)
return cci_init_status;
mutex_lock(&cci_probing);
if (cci_init_status == -EAGAIN)
cci_init_status = cci_probe();
mutex_unlock(&cci_probing);
return cci_init_status;
}
/*
* To sort out early init calls ordering a helper function is provided to
* check if the CCI driver has beed initialized. Function check if the driver
* has been initialized, if not it calls the init function that probes
* the driver and updates the return value.
*/
bool cci_probed(void)
{
return cci_init() == 0;
}
EXPORT_SYMBOL_GPL(cci_probed);
early_initcall(cci_init);
core_initcall(cci_platform_init);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ARM CCI support");
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