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: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 81 insertions, 60 deletions

diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index 5d29ec34078e..ae3864d95e6c 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -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;
 }