drivers: CCI: add ARM CCI PMU support (b91c8f28) · Commits · 戴 / test

drivers/bus/arm-cci.c

+632 −4

Original line number	Diff line number	Diff line
		@@ -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");

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