Cc: devicetree@xxxxxxxxxxxxxxx
Cc: Punit Agrawal <punit.agrawal@xxxxxxx>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@xxxxxxx>
---
Documentation/devicetree/bindings/arm/cci.txt | 7 +-
arch/arm/include/asm/arm-cci.h | 42 ++++++++
arch/arm64/include/asm/arm-cci.h | 27 +++++
drivers/bus/arm-cci.c | 138 ++++++++++++++++---------
include/linux/arm-cci.h | 2 +
5 files changed, 166 insertions(+), 50 deletions(-)
create mode 100644 arch/arm/include/asm/arm-cci.h
create mode 100644 arch/arm64/include/asm/arm-cci.h
diff --git a/Documentation/devicetree/bindings/arm/cci.txt b/Documentation/devicetree/bindings/arm/cci.txt
index f28d82b..0e4b6a7 100644
--- a/Documentation/devicetree/bindings/arm/cci.txt
+++ b/Documentation/devicetree/bindings/arm/cci.txt
@@ -94,8 +94,11 @@ specific to ARM.
- compatible
Usage: required
Value type: <string>
- Definition: must be "arm,cci-400-pmu"
-
+ Definition: Supported strings are :
+ "arm,cci-400-pmu,r0"
+ "arm,cci-400-pmu,r1"
+ "arm,cci-400-pmu" - DEPRECATED, permitted only where OS has
+ secure acces to CCI registers
- reg:
Usage: required
Value type: Integer cells. A register entry, expressed
diff --git a/arch/arm/include/asm/arm-cci.h b/arch/arm/include/asm/arm-cci.h
new file mode 100644
index 0000000..b828d7a
--- /dev/null
+++ b/arch/arm/include/asm/arm-cci.h
@@ -0,0 +1,42 @@
+/*
+ * arch/arm/include/asm/arm-cci.h
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ *
+ * 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 in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_ARM_CCI_H
+#define __ASM_ARM_CCI_H
+
+#ifdef CONFIG_MCPM
+#include <asm/mcpm.h>
+
+/*
+ * We don't have a reliable way of detecting, whether
+ * we have access to secure-only registers, unless
+ * mcpm is registered.
+ */
+static inline int platform_has_secure_cci_access(void)
+{
+ return mcpm_is_available();
+}
+
+#else
+static inline int platform_has_secure_cci_access(void)
+{
+ return 0;
+}
+#endif
+
+#endif
diff --git a/arch/arm64/include/asm/arm-cci.h b/arch/arm64/include/asm/arm-cci.h
new file mode 100644
index 0000000..37bbe37
--- /dev/null
+++ b/arch/arm64/include/asm/arm-cci.h
@@ -0,0 +1,27 @@
+/*
+ * arch/arm64/include/asm/arm-cci.h
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ *
+ * 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 in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_ARM_CCI_H
+#define __ASM_ARM_CCI_H
+
+static inline int platform_has_secure_cci_access(void)
+{
+ return 0;
+}
+
+#endif
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index f27cf56..fe9fa46 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;
@@ -152,47 +171,16 @@ 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;
+ return pmu->model->event_ranges[CCI_IF_SLAVE].min <= ev_code &&
+ ev_code <= pmu->model->event_ranges[CCI_IF_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;
+ return pmu->model->event_ranges[CCI_IF_MASTER].min <= ev_code &&
+ ev_code <= pmu->model->event_ranges[CCI_IF_MASTER].max;
}
static int pmu_validate_hw_event(u8 hw_event)
@@ -234,11 +222,11 @@ 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];
+ 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)
@@ -807,9 +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,
@@ -862,13 +850,65 @@ 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",
+ .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, "DEPERCATED 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;
@@ -884,11 +924,19 @@ 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 -EINVAL;
+ }
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))
@@ -920,12 +968,6 @@ 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);
diff --git a/include/linux/arm-cci.h b/include/linux/arm-cci.h
index 79d6edf..aede5c7 100644
--- a/include/linux/arm-cci.h
+++ b/include/linux/arm-cci.h
@@ -24,6 +24,8 @@
#include <linux/errno.h>
#include <linux/types.h>
+#include <asm/arm-cci.h>
+
struct device_node;
#ifdef CONFIG_ARM_CCI
--
1.7.9.5
