Commit fc17c839 authored by Suzuki K. Poulose's avatar Suzuki K. Poulose Committed by Will Deacon
Browse files

arm-cci: Abstract the CCI400 PMU specific definitions 



CCI400 has different event specifications for PMU, for revsion
0 and revision 1. As of now, we check the revision every single
time before using the parameters for the PMU. This patch abstracts
the details of the pmu models in a struct (cci_pmu_model) and
stores the information in cci_pmu at initialisation time, avoiding
multiple probe operations.

Tested-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Acked-by: default avatarPunit Agrawal <punit.agrawal@arm.com>
Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarSuzuki K. Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent f6b9e83c

drivers/bus/arm-cci.c

+81 −60
Original line number Diff line number Diff line
@@ -79,19 +79,38 @@ static const struct of_device_id arm_cci_matches[] = { 


#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;

	struct pmu_port_event_ranges *port_ranges;

	const struct cci_pmu_model *model;

	struct cci_pmu_hw_events hw_events;

	struct platform_device *plat_device;

	int num_events;
@@ -152,53 +171,11 @@ enum cci400_perf_events { 
#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,

	},

};



/*

 * Export different PMU names for the different revisions so userspace knows

 * because the event ids are different

 */

static char *const pmu_names[] = {

	[CCI_REV_R0] = "CCI_400",

	[CCI_REV_R1] = "CCI_400_r1",

};



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);

	int if_type;



	switch (ev_source) {

	case CCI_PORT_S0:
@@ -207,18 +184,22 @@ static int pmu_validate_hw_event(u8 hw_event) 
	case CCI_PORT_S3:

	case CCI_PORT_S4:

		/* Slave Interface */

		if (pmu_is_valid_slave_event(ev_code))

			return hw_event;

		if_type = CCI_IF_SLAVE;

		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;

		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;

}
@@ -234,11 +215,9 @@ static int probe_cci_revision(void) 
		return CCI_REV_R1;

}



static struct pmu_port_event_ranges *port_range_by_rev(void)

static const struct cci_pmu_model *probe_cci_model(struct platform_device *pdev)

{

	int rev = probe_cci_revision();



	return &port_event_range[rev];

	return &cci_pmu_models[probe_cci_revision()];

}



static int pmu_is_valid_counter(struct cci_pmu *cci_pmu, int idx)
@@ -816,9 +795,9 @@ static const struct attribute_group *pmu_attr_groups[] = { 


static int cci_pmu_init(struct cci_pmu *cci_pmu, struct platform_device *pdev)

{

	char *name = pmu_names[probe_cci_revision()];

	char *name = cci_pmu->model->name;

	cci_pmu->pmu = (struct pmu) {

		.name		= pmu_names[probe_cci_revision()],

		.name		= cci_pmu->model->name,

		.task_ctx_nr	= perf_invalid_context,

		.pmu_enable	= cci_pmu_enable,

		.pmu_disable	= cci_pmu_disable,
@@ -871,6 +850,35 @@ static struct notifier_block cci_pmu_cpu_nb = { 
	.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",
@@ -878,6 +886,16 @@ static const struct of_device_id arm_cci_pmu_matches[] = { 
	{},

};



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;



	return probe_cci_model(pdev);

}



static bool is_duplicate_irq(int irq, int *irqs, int nr_irqs)

{

	int i;
@@ -893,11 +911,19 @@ 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))
@@ -929,12 +955,6 @@ static int cci_pmu_probe(struct platform_device *pdev) 
		return -EINVAL;

	}



	pmu->port_ranges = port_range_by_rev();

	if (!pmu->port_ranges) {

		dev_warn(&pdev->dev, "CCI PMU version not supported\n");

		return -EINVAL;

	}



	raw_spin_lock_init(&pmu->hw_events.pmu_lock);

	mutex_init(&pmu->reserve_mutex);

	atomic_set(&pmu->active_events, 0);
@@ -948,6 +968,7 @@ static int cci_pmu_probe(struct platform_device *pdev) 
	if (ret)

		return ret;



	pr_info("ARM %s PMU driver probed", pmu->model->name);

	return 0;

}

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