drivers: CCI: add ARM CCI PMU support

Extend the existing CCI driver to support the PMU by registering a perf
backend for it.

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Nicolas Pitre <nico@linaro.org>
Cc: Dave Martin <dave.martin@linaro.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
[will: removed broken __init annotations]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Punit Agrawal 2013-08-22 14:41:51 +01:00 committed by Will Deacon
parent 83bc10a275
commit b91c8f284a
1 changed files with 632 additions and 4 deletions

View File

@ -18,11 +18,21 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <asm/cacheflush.h>
#include <asm/irq_regs.h>
#include <asm/pmu.h>
#include <asm/smp_plat.h>
#define DRIVER_NAME "CCI-400"
#define DRIVER_NAME_PMU DRIVER_NAME " PMU"
#define PMU_NAME "CCI_400"
#define CCI_PORT_CTRL 0x0
#define CCI_CTRL_STATUS 0xc
@ -54,6 +64,587 @@ static unsigned int nb_cci_ports;
static void __iomem *cci_ctrl_base;
static unsigned long cci_ctrl_phys;
#ifdef CONFIG_HW_PERF_EVENTS
#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
/* 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_R0_P4 4
#define CCI_REV_R1_P2 6
#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)
/*
* 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_EVENT_MASK 0xff
#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 */
#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
struct pmu_port_event_ranges {
u8 slave_min;
u8 slave_max;
u8 master_min;
u8 master_max;
};
static struct pmu_port_event_ranges port_event_range[] = {
[CCI_REV_R0] = {
.slave_min = CCI_REV_R0_SLAVE_PORT_MIN_EV,
.slave_max = CCI_REV_R0_SLAVE_PORT_MAX_EV,
.master_min = CCI_REV_R0_MASTER_PORT_MIN_EV,
.master_max = CCI_REV_R0_MASTER_PORT_MAX_EV,
},
[CCI_REV_R1] = {
.slave_min = CCI_REV_R1_SLAVE_PORT_MIN_EV,
.slave_max = CCI_REV_R1_SLAVE_PORT_MAX_EV,
.master_min = CCI_REV_R1_MASTER_PORT_MIN_EV,
.master_max = CCI_REV_R1_MASTER_PORT_MAX_EV,
},
};
struct cci_pmu_drv_data {
void __iomem *base;
struct arm_pmu *cci_pmu;
int nr_irqs;
int irqs[CCI_PMU_MAX_HW_EVENTS];
unsigned long active_irqs;
struct perf_event *events[CCI_PMU_MAX_HW_EVENTS];
unsigned long used_mask[BITS_TO_LONGS(CCI_PMU_MAX_HW_EVENTS)];
struct pmu_port_event_ranges *port_ranges;
struct pmu_hw_events hw_events;
};
static struct cci_pmu_drv_data *pmu;
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 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_R0_P4)
return CCI_REV_R0;
else if (rev <= CCI_REV_R1_P2)
return CCI_REV_R1;
return -ENOENT;
}
static struct pmu_port_event_ranges *port_range_by_rev(void)
{
int rev = probe_cci_revision();
if (rev < 0)
return NULL;
return &port_event_range[rev];
}
static int pmu_is_valid_slave_event(u8 ev_code)
{
return pmu->port_ranges->slave_min <= ev_code &&
ev_code <= pmu->port_ranges->slave_max;
}
static int pmu_is_valid_master_event(u8 ev_code)
{
return pmu->port_ranges->master_min <= ev_code &&
ev_code <= pmu->port_ranges->master_max;
}
static int pmu_validate_hw_event(u8 hw_event)
{
u8 ev_source = CCI_PMU_EVENT_SOURCE(hw_event);
u8 ev_code = CCI_PMU_EVENT_CODE(hw_event);
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 (pmu_is_valid_slave_event(ev_code))
return hw_event;
break;
case CCI_PORT_M0:
case CCI_PORT_M1:
case CCI_PORT_M2:
/* Master Interface */
if (pmu_is_valid_master_event(ev_code))
return hw_event;
break;
}
return -ENOENT;
}
static int pmu_is_valid_counter(struct arm_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)
{
event &= CCI_PMU_EVENT_MASK;
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 struct pmu_hw_events *pmu_get_hw_events(void)
{
return &pmu->hw_events;
}
static int pmu_get_event_idx(struct pmu_hw_events *hw, struct perf_event *event)
{
struct arm_pmu *cci_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hw_event = &event->hw;
unsigned long cci_event = hw_event->config_base & CCI_PMU_EVENT_MASK;
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;
u8 config = event->attr.config & CCI_PMU_EVENT_MASK;
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 arm_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 irqreturn_t pmu_handle_irq(int irq_num, void *dev)
{
unsigned long flags;
struct arm_pmu *cci_pmu = (struct arm_pmu *)dev;
struct pmu_hw_events *events = cci_pmu->get_hw_events();
struct perf_sample_data data;
struct pt_regs *regs;
int idx, handled = IRQ_NONE;
raw_spin_lock_irqsave(&events->pmu_lock, flags);
regs = get_irq_regs();
/*
* 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);
handled = IRQ_HANDLED;
armpmu_event_update(event);
perf_sample_data_init(&data, 0, hw_counter->last_period);
if (!armpmu_event_set_period(event))
continue;
if (perf_event_overflow(event, &data, regs))
cci_pmu->disable(event);
}
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
return IRQ_RETVAL(handled);
}
static void pmu_free_irq(struct arm_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 void pmu_enable_event(struct perf_event *event)
{
unsigned long flags;
struct arm_pmu *cci_pmu = to_arm_pmu(event->pmu);
struct pmu_hw_events *events = cci_pmu->get_hw_events();
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);
return;
}
raw_spin_lock_irqsave(&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, hw_counter->config_base);
pmu_enable_counter(idx);
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
}
static void pmu_disable_event(struct perf_event *event)
{
struct arm_pmu *cci_pmu = to_arm_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);
return;
}
pmu_disable_counter(idx);
}
static void pmu_start(struct arm_pmu *cci_pmu)
{
u32 val;
unsigned long flags;
struct pmu_hw_events *events = cci_pmu->get_hw_events();
raw_spin_lock_irqsave(&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(&events->pmu_lock, flags);
}
static void pmu_stop(struct arm_pmu *cci_pmu)
{
u32 val;
unsigned long flags;
struct pmu_hw_events *events = cci_pmu->get_hw_events();
raw_spin_lock_irqsave(&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(&events->pmu_lock, flags);
}
static u32 pmu_read_counter(struct perf_event *event)
{
struct arm_pmu *cci_pmu = to_arm_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 arm_pmu *cci_pmu = to_arm_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 int cci_pmu_init(struct arm_pmu *cci_pmu, struct platform_device *pdev)
{
*cci_pmu = (struct arm_pmu){
.name = PMU_NAME,
.max_period = (1LLU << 32) - 1,
.get_hw_events = pmu_get_hw_events,
.get_event_idx = pmu_get_event_idx,
.map_event = pmu_map_event,
.request_irq = pmu_request_irq,
.handle_irq = pmu_handle_irq,
.free_irq = pmu_free_irq,
.enable = pmu_enable_event,
.disable = pmu_disable_event,
.start = pmu_start,
.stop = pmu_stop,
.read_counter = pmu_read_counter,
.write_counter = pmu_write_counter,
};
cci_pmu->plat_device = pdev;
cci_pmu->num_events = pmu_get_max_counters();
return armpmu_register(cci_pmu, -1);
}
static const struct of_device_id arm_cci_pmu_matches[] = {
{
.compatible = "arm,cci-400-pmu",
},
{},
};
static int cci_pmu_probe(struct platform_device *pdev)
{
struct resource *res;
int i, ret, irq;
pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL);
if (!pmu)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_warn(&pdev->dev, "Failed to get mem resource\n");
ret = -EINVAL;
goto memalloc_err;
};
pmu->base = devm_ioremap_resource(&pdev->dev, res);
if (!pmu->base) {
dev_warn(&pdev->dev, "Failed to ioremap\n");
ret = -ENOMEM;
goto memalloc_err;
}
/*
* 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);
ret = -EINVAL;
goto memalloc_err;
}
pmu->port_ranges = port_range_by_rev();
if (!pmu->port_ranges) {
dev_warn(&pdev->dev, "CCI PMU version not supported\n");
ret = -EINVAL;
goto memalloc_err;
}
pmu->cci_pmu = devm_kzalloc(&pdev->dev, sizeof(*(pmu->cci_pmu)), GFP_KERNEL);
if (!pmu->cci_pmu) {
ret = -ENOMEM;
goto memalloc_err;
}
pmu->hw_events.events = pmu->events;
pmu->hw_events.used_mask = pmu->used_mask;
raw_spin_lock_init(&pmu->hw_events.pmu_lock);
ret = cci_pmu_init(pmu->cci_pmu, pdev);
if (ret)
goto pmuinit_err;
return 0;
pmuinit_err:
kfree(pmu->cci_pmu);
memalloc_err:
kfree(pmu);
return ret;
}
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);
}
#endif /* CONFIG_HW_PERF_EVENTS */
struct cpu_port {
u64 mpidr;
u32 port;
@ -120,7 +711,7 @@ int cci_ace_get_port(struct device_node *dn)
}
EXPORT_SYMBOL_GPL(cci_ace_get_port);
static void __init cci_ace_init_ports(void)
static void cci_ace_init_ports(void)
{
int port, cpu;
struct device_node *cpun;
@ -386,7 +977,7 @@ static const struct of_device_id arm_cci_ctrl_if_matches[] = {
{},
};
static int __init cci_probe(void)
static int cci_probe(void)
{
struct cci_nb_ports const *cci_config;
int ret, i, nb_ace = 0, nb_ace_lite = 0;
@ -490,7 +1081,7 @@ memalloc_err:
static int cci_init_status = -EAGAIN;
static DEFINE_MUTEX(cci_probing);
static int __init cci_init(void)
static int cci_init(void)
{
if (cci_init_status != -EAGAIN)
return cci_init_status;
@ -502,18 +1093,55 @@ static int __init cci_init(void)
return cci_init_status;
}
#ifdef CONFIG_HW_PERF_EVENTS
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
static int __init cci_platform_init(void)
{
return 0;
}
#endif
/*
* 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 __init cci_probed(void)
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");