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801f33be8e
linux_dsm_epyc7002/drivers/bus/arm-cci.c
Lorenzo Pieralisi 801f33be8e drivers: cci: add missing CCI port availability firmware check 
The CCI ports programming interface is available to the kernel
only when booted in secure mode (or when firmware enables
non-secure access to override CCI ports control). In both cases,
firmware reports the CCI ports availability through the device
tree CCI ports nodes, which must be parsed and their status checked
by the kernel probing path.

This check is currently missing and may cause the kernel to
erroneously believe it is free to take control of CCI ports
where in practice CCI ports control is forbidden.

Add the missing CCI port availability check to the CCI driver
in order to guarantee sane CCI usage.

Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2016-10-17 14:27:54 +01:00

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/*
* CCI cache coherent interconnect driver
*
* Copyright (C) 2013 ARM Ltd.
* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
*
* 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 "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/arm-cci.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
static void __iomem *cci_ctrl_base;
static unsigned long cci_ctrl_phys;
#ifdef CONFIG_ARM_CCI400_PORT_CTRL
struct cci_nb_ports {
unsigned int nb_ace;
unsigned int nb_ace_lite;
};
static const struct cci_nb_ports cci400_ports = {
.nb_ace = 2,
.nb_ace_lite = 3
};
#define CCI400_PORTS_DATA (&cci400_ports)
#else
#define CCI400_PORTS_DATA (NULL)
#endif
static const struct of_device_id arm_cci_matches[] = {
#ifdef CONFIG_ARM_CCI400_COMMON
{.compatible = "arm,cci-400", .data = CCI400_PORTS_DATA },
#endif
#ifdef CONFIG_ARM_CCI5xx_PMU
{ .compatible = "arm,cci-500", },
{ .compatible = "arm,cci-550", },
#endif
{},
};
#ifdef CONFIG_ARM_CCI_PMU
#define DRIVER_NAME "ARM-CCI"
#define DRIVER_NAME_PMU DRIVER_NAME " PMU"
#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
#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_SIZE(model) ((model)->cntr_size)
#define CCI_PMU_CNTR_BASE(model, idx) ((idx) * CCI_PMU_CNTR_SIZE(model))
#define CCI_PMU_CNTR_MASK ((1ULL << 32) -1)
#define CCI_PMU_CNTR_LAST(cci_pmu) (cci_pmu->num_cntrs - 1)
#define CCI_PMU_MAX_HW_CNTRS(model) \
((model)->num_hw_cntrs + (model)->fixed_hw_cntrs)
/* Types of interfaces that can generate events */
enum {
CCI_IF_SLAVE,
CCI_IF_MASTER,
#ifdef CONFIG_ARM_CCI5xx_PMU
CCI_IF_GLOBAL,
#endif
CCI_IF_MAX,
};
struct event_range {
u32 min;
u32 max;
};
struct cci_pmu_hw_events {
struct perf_event **events;
unsigned long *used_mask;
raw_spinlock_t pmu_lock;
};
struct cci_pmu;
/*
* struct cci_pmu_model:
* @fixed_hw_cntrs - Number of fixed event counters
* @num_hw_cntrs - Maximum number of programmable event counters
* @cntr_size - Size of an event counter mapping
*/
struct cci_pmu_model {
char *name;
u32 fixed_hw_cntrs;
u32 num_hw_cntrs;
u32 cntr_size;
struct attribute **format_attrs;
struct attribute **event_attrs;
struct event_range event_ranges[CCI_IF_MAX];
int (*validate_hw_event)(struct cci_pmu *, unsigned long);
int (*get_event_idx)(struct cci_pmu *, struct cci_pmu_hw_events *, unsigned long);
void (*write_counters)(struct cci_pmu *, unsigned long *);
};
static struct cci_pmu_model cci_pmu_models[];
struct cci_pmu {
void __iomem *base;
struct pmu pmu;
int nr_irqs;
int *irqs;
unsigned long active_irqs;
const struct cci_pmu_model *model;
struct cci_pmu_hw_events hw_events;
struct platform_device *plat_device;
int num_cntrs;
atomic_t active_events;
struct mutex reserve_mutex;
struct hlist_node node;
cpumask_t cpus;
};
#define to_cci_pmu(c) (container_of(c, struct cci_pmu, pmu))
enum cci_models {
#ifdef CONFIG_ARM_CCI400_PMU
CCI400_R0,
CCI400_R1,
#endif
#ifdef CONFIG_ARM_CCI5xx_PMU
CCI500_R0,
CCI550_R0,
#endif
CCI_MODEL_MAX
};
static void pmu_write_counters(struct cci_pmu *cci_pmu,
unsigned long *mask);
static ssize_t cci_pmu_format_show(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t cci_pmu_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
#define CCI_EXT_ATTR_ENTRY(_name, _func, _config) \
&((struct dev_ext_attribute[]) { \
{ __ATTR(_name, S_IRUGO, _func, NULL), (void *)_config } \
})[0].attr.attr
#define CCI_FORMAT_EXT_ATTR_ENTRY(_name, _config) \
CCI_EXT_ATTR_ENTRY(_name, cci_pmu_format_show, (char *)_config)
#define CCI_EVENT_EXT_ATTR_ENTRY(_name, _config) \
CCI_EXT_ATTR_ENTRY(_name, cci_pmu_event_show, (unsigned long)_config)
/* CCI400 PMU Specific definitions */
#ifdef CONFIG_ARM_CCI400_PMU
/* Port ids */
#define CCI400_PORT_S0 0
#define CCI400_PORT_S1 1
#define CCI400_PORT_S2 2
#define CCI400_PORT_S3 3
#define CCI400_PORT_S4 4
#define CCI400_PORT_M0 5
#define CCI400_PORT_M1 6
#define CCI400_PORT_M2 7
#define CCI400_R1_PX 5
/*
* 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 {
CCI400_PMU_CYCLES = 0xff
};
#define CCI400_PMU_CYCLE_CNTR_IDX 0
#define CCI400_PMU_CNTR0_IDX 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 CCI400_PMU_EVENT_MASK 0xffUL
#define CCI400_PMU_EVENT_SOURCE_SHIFT 5
#define CCI400_PMU_EVENT_SOURCE_MASK 0x7
#define CCI400_PMU_EVENT_CODE_SHIFT 0
#define CCI400_PMU_EVENT_CODE_MASK 0x1f
#define CCI400_PMU_EVENT_SOURCE(event) \
((event >> CCI400_PMU_EVENT_SOURCE_SHIFT) & \
CCI400_PMU_EVENT_SOURCE_MASK)
#define CCI400_PMU_EVENT_CODE(event) \
((event >> CCI400_PMU_EVENT_CODE_SHIFT) & CCI400_PMU_EVENT_CODE_MASK)
#define CCI400_R0_SLAVE_PORT_MIN_EV 0x00
#define CCI400_R0_SLAVE_PORT_MAX_EV 0x13
#define CCI400_R0_MASTER_PORT_MIN_EV 0x14
#define CCI400_R0_MASTER_PORT_MAX_EV 0x1a
#define CCI400_R1_SLAVE_PORT_MIN_EV 0x00
#define CCI400_R1_SLAVE_PORT_MAX_EV 0x14
#define CCI400_R1_MASTER_PORT_MIN_EV 0x00
#define CCI400_R1_MASTER_PORT_MAX_EV 0x11
#define CCI400_CYCLE_EVENT_EXT_ATTR_ENTRY(_name, _config) \
CCI_EXT_ATTR_ENTRY(_name, cci400_pmu_cycle_event_show, \
(unsigned long)_config)
static ssize_t cci400_pmu_cycle_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
static struct attribute *cci400_pmu_format_attrs[] = {
CCI_FORMAT_EXT_ATTR_ENTRY(event, "config:0-4"),
CCI_FORMAT_EXT_ATTR_ENTRY(source, "config:5-7"),
NULL
};
static struct attribute *cci400_r0_pmu_event_attrs[] = {
/* Slave events */
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_any, 0x0),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_device, 0x01),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_normal_or_nonshareable, 0x2),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_inner_or_outershareable, 0x3),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_cache_maintenance, 0x4),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_mem_barrier, 0x5),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_sync_barrier, 0x6),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_dvm_msg, 0x7),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_dvm_msg_sync, 0x8),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_stall_tt_full, 0x9),
CCI_EVENT_EXT_ATTR_ENTRY(si_r_data_last_hs_snoop, 0xA),
CCI_EVENT_EXT_ATTR_ENTRY(si_r_data_stall_rvalids_h_rready_l, 0xB),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_any, 0xC),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_device, 0xD),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_normal_or_nonshareable, 0xE),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_inner_or_outershare_wback_wclean, 0xF),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_write_unique, 0x10),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_write_line_unique, 0x11),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_evict, 0x12),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_stall_tt_full, 0x13),
/* Master events */
CCI_EVENT_EXT_ATTR_ENTRY(mi_retry_speculative_fetch, 0x14),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_addr_hazard, 0x15),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_id_hazard, 0x16),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_tt_full, 0x17),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_barrier_hazard, 0x18),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_barrier_hazard, 0x19),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_tt_full, 0x1A),
/* Special event for cycles counter */
CCI400_CYCLE_EVENT_EXT_ATTR_ENTRY(cycles, 0xff),
NULL
};
static struct attribute *cci400_r1_pmu_event_attrs[] = {
/* Slave events */
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_any, 0x0),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_device, 0x01),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_normal_or_nonshareable, 0x2),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_inner_or_outershareable, 0x3),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_cache_maintenance, 0x4),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_mem_barrier, 0x5),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_sync_barrier, 0x6),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_dvm_msg, 0x7),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_dvm_msg_sync, 0x8),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_stall_tt_full, 0x9),
CCI_EVENT_EXT_ATTR_ENTRY(si_r_data_last_hs_snoop, 0xA),
CCI_EVENT_EXT_ATTR_ENTRY(si_r_data_stall_rvalids_h_rready_l, 0xB),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_any, 0xC),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_device, 0xD),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_normal_or_nonshareable, 0xE),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_inner_or_outershare_wback_wclean, 0xF),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_write_unique, 0x10),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_write_line_unique, 0x11),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_evict, 0x12),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_stall_tt_full, 0x13),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_stall_slave_id_hazard, 0x14),
/* Master events */
CCI_EVENT_EXT_ATTR_ENTRY(mi_retry_speculative_fetch, 0x0),
CCI_EVENT_EXT_ATTR_ENTRY(mi_stall_cycle_addr_hazard, 0x1),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_master_id_hazard, 0x2),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_hi_prio_rtq_full, 0x3),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_barrier_hazard, 0x4),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_barrier_hazard, 0x5),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_wtq_full, 0x6),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_low_prio_rtq_full, 0x7),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_mid_prio_rtq_full, 0x8),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_qvn_vn0, 0x9),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_qvn_vn1, 0xA),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_qvn_vn2, 0xB),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall_qvn_vn3, 0xC),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_qvn_vn0, 0xD),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_qvn_vn1, 0xE),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_qvn_vn2, 0xF),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall_qvn_vn3, 0x10),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_unique_or_line_unique_addr_hazard, 0x11),
/* Special event for cycles counter */
CCI400_CYCLE_EVENT_EXT_ATTR_ENTRY(cycles, 0xff),
NULL
};
static ssize_t cci400_pmu_cycle_event_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_ext_attribute *eattr = container_of(attr,
struct dev_ext_attribute, attr);
return snprintf(buf, PAGE_SIZE, "config=0x%lx\n", (unsigned long)eattr->var);
}
static int cci400_get_event_idx(struct cci_pmu *cci_pmu,
struct cci_pmu_hw_events *hw,
unsigned long cci_event)
{
int idx;
/* cycles event idx is fixed */
if (cci_event == CCI400_PMU_CYCLES) {
if (test_and_set_bit(CCI400_PMU_CYCLE_CNTR_IDX, hw->used_mask))
return -EAGAIN;
return CCI400_PMU_CYCLE_CNTR_IDX;
}
for (idx = CCI400_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 cci400_validate_hw_event(struct cci_pmu *cci_pmu, unsigned long hw_event)
{
u8 ev_source = CCI400_PMU_EVENT_SOURCE(hw_event);
u8 ev_code = CCI400_PMU_EVENT_CODE(hw_event);
int if_type;
if (hw_event & ~CCI400_PMU_EVENT_MASK)
return -ENOENT;
if (hw_event == CCI400_PMU_CYCLES)
return hw_event;
switch (ev_source) {
case CCI400_PORT_S0:
case CCI400_PORT_S1:
case CCI400_PORT_S2:
case CCI400_PORT_S3:
case CCI400_PORT_S4:
/* Slave Interface */
if_type = CCI_IF_SLAVE;
break;
case CCI400_PORT_M0:
case CCI400_PORT_M1:
case CCI400_PORT_M2:
/* Master Interface */
if_type = CCI_IF_MASTER;
break;
default:
return -ENOENT;
}
if (ev_code >= cci_pmu->model->event_ranges[if_type].min &&
ev_code <= cci_pmu->model->event_ranges[if_type].max)
return hw_event;
return -ENOENT;
}
static int probe_cci400_revision(void)
{
int rev;
rev = readl_relaxed(cci_ctrl_base + CCI_PID2) & CCI_PID2_REV_MASK;
rev >>= CCI_PID2_REV_SHIFT;
if (rev < CCI400_R1_PX)
return CCI400_R0;
else
return CCI400_R1;
}
static const struct cci_pmu_model *probe_cci_model(struct platform_device *pdev)
{
if (platform_has_secure_cci_access())
return &cci_pmu_models[probe_cci400_revision()];
return NULL;
}
#else /* !CONFIG_ARM_CCI400_PMU */
static inline struct cci_pmu_model *probe_cci_model(struct platform_device *pdev)
{
return NULL;
}
#endif /* CONFIG_ARM_CCI400_PMU */
#ifdef CONFIG_ARM_CCI5xx_PMU
/*
* CCI5xx PMU event id is an 9-bit value made of two parts.
* bits [8:5] - Source for the event
* bits [4:0] - Event code (specific to type of interface)
*
*
*/
/* Port ids */
#define CCI5xx_PORT_S0 0x0
#define CCI5xx_PORT_S1 0x1
#define CCI5xx_PORT_S2 0x2
#define CCI5xx_PORT_S3 0x3
#define CCI5xx_PORT_S4 0x4
#define CCI5xx_PORT_S5 0x5
#define CCI5xx_PORT_S6 0x6
#define CCI5xx_PORT_M0 0x8
#define CCI5xx_PORT_M1 0x9
#define CCI5xx_PORT_M2 0xa
#define CCI5xx_PORT_M3 0xb
#define CCI5xx_PORT_M4 0xc
#define CCI5xx_PORT_M5 0xd
#define CCI5xx_PORT_M6 0xe
#define CCI5xx_PORT_GLOBAL 0xf
#define CCI5xx_PMU_EVENT_MASK 0x1ffUL
#define CCI5xx_PMU_EVENT_SOURCE_SHIFT 0x5
#define CCI5xx_PMU_EVENT_SOURCE_MASK 0xf
#define CCI5xx_PMU_EVENT_CODE_SHIFT 0x0
#define CCI5xx_PMU_EVENT_CODE_MASK 0x1f
#define CCI5xx_PMU_EVENT_SOURCE(event) \
((event >> CCI5xx_PMU_EVENT_SOURCE_SHIFT) & CCI5xx_PMU_EVENT_SOURCE_MASK)
#define CCI5xx_PMU_EVENT_CODE(event) \
((event >> CCI5xx_PMU_EVENT_CODE_SHIFT) & CCI5xx_PMU_EVENT_CODE_MASK)
#define CCI5xx_SLAVE_PORT_MIN_EV 0x00
#define CCI5xx_SLAVE_PORT_MAX_EV 0x1f
#define CCI5xx_MASTER_PORT_MIN_EV 0x00
#define CCI5xx_MASTER_PORT_MAX_EV 0x06
#define CCI5xx_GLOBAL_PORT_MIN_EV 0x00
#define CCI5xx_GLOBAL_PORT_MAX_EV 0x0f
#define CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(_name, _config) \
CCI_EXT_ATTR_ENTRY(_name, cci5xx_pmu_global_event_show, \
(unsigned long) _config)
static ssize_t cci5xx_pmu_global_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
static struct attribute *cci5xx_pmu_format_attrs[] = {
CCI_FORMAT_EXT_ATTR_ENTRY(event, "config:0-4"),
CCI_FORMAT_EXT_ATTR_ENTRY(source, "config:5-8"),
NULL,
};
static struct attribute *cci5xx_pmu_event_attrs[] = {
/* Slave events */
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_arvalid, 0x0),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_dev, 0x1),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_nonshareable, 0x2),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_shareable_non_alloc, 0x3),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_shareable_alloc, 0x4),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_invalidate, 0x5),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_cache_maint, 0x6),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_dvm_msg, 0x7),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_rval, 0x8),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_hs_rlast_snoop, 0x9),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_hs_awalid, 0xA),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_dev, 0xB),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_non_shareable, 0xC),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_share_wb, 0xD),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_share_wlu, 0xE),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_share_wunique, 0xF),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_evict, 0x10),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_wrevict, 0x11),
CCI_EVENT_EXT_ATTR_ENTRY(si_w_data_beat, 0x12),
CCI_EVENT_EXT_ATTR_ENTRY(si_srq_acvalid, 0x13),
CCI_EVENT_EXT_ATTR_ENTRY(si_srq_read, 0x14),
CCI_EVENT_EXT_ATTR_ENTRY(si_srq_clean, 0x15),
CCI_EVENT_EXT_ATTR_ENTRY(si_srq_data_transfer_low, 0x16),
CCI_EVENT_EXT_ATTR_ENTRY(si_rrq_stall_arvalid, 0x17),
CCI_EVENT_EXT_ATTR_ENTRY(si_r_data_stall, 0x18),
CCI_EVENT_EXT_ATTR_ENTRY(si_wrq_stall, 0x19),
CCI_EVENT_EXT_ATTR_ENTRY(si_w_data_stall, 0x1A),
CCI_EVENT_EXT_ATTR_ENTRY(si_w_resp_stall, 0x1B),
CCI_EVENT_EXT_ATTR_ENTRY(si_srq_stall, 0x1C),
CCI_EVENT_EXT_ATTR_ENTRY(si_s_data_stall, 0x1D),
CCI_EVENT_EXT_ATTR_ENTRY(si_rq_stall_ot_limit, 0x1E),
CCI_EVENT_EXT_ATTR_ENTRY(si_r_stall_arbit, 0x1F),
/* Master events */
CCI_EVENT_EXT_ATTR_ENTRY(mi_r_data_beat_any, 0x0),
CCI_EVENT_EXT_ATTR_ENTRY(mi_w_data_beat_any, 0x1),
CCI_EVENT_EXT_ATTR_ENTRY(mi_rrq_stall, 0x2),
CCI_EVENT_EXT_ATTR_ENTRY(mi_r_data_stall, 0x3),
CCI_EVENT_EXT_ATTR_ENTRY(mi_wrq_stall, 0x4),
CCI_EVENT_EXT_ATTR_ENTRY(mi_w_data_stall, 0x5),
CCI_EVENT_EXT_ATTR_ENTRY(mi_w_resp_stall, 0x6),
/* Global events */
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_access_filter_bank_0_1, 0x0),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_access_filter_bank_2_3, 0x1),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_access_filter_bank_4_5, 0x2),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_access_filter_bank_6_7, 0x3),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_access_miss_filter_bank_0_1, 0x4),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_access_miss_filter_bank_2_3, 0x5),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_access_miss_filter_bank_4_5, 0x6),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_access_miss_filter_bank_6_7, 0x7),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_back_invalidation, 0x8),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_stall_alloc_busy, 0x9),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_stall_tt_full, 0xA),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_wrq, 0xB),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_cd_hs, 0xC),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_rq_stall_addr_hazard, 0xD),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_rq_stall_tt_full, 0xE),
CCI5xx_GLOBAL_EVENT_EXT_ATTR_ENTRY(cci_snoop_rq_tzmp1_prot, 0xF),
NULL
};
static ssize_t cci5xx_pmu_global_event_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_ext_attribute *eattr = container_of(attr,
struct dev_ext_attribute, attr);
/* Global events have single fixed source code */
return snprintf(buf, PAGE_SIZE, "event=0x%lx,source=0x%x\n",
(unsigned long)eattr->var, CCI5xx_PORT_GLOBAL);
}
/*
* CCI500 provides 8 independent event counters that can count
* any of the events available.
* CCI500 PMU event source ids
* 0x0-0x6 - Slave interfaces
* 0x8-0xD - Master interfaces
* 0xf - Global Events
* 0x7,0xe - Reserved
*/
static int cci500_validate_hw_event(struct cci_pmu *cci_pmu,
unsigned long hw_event)
{
u32 ev_source = CCI5xx_PMU_EVENT_SOURCE(hw_event);
u32 ev_code = CCI5xx_PMU_EVENT_CODE(hw_event);
int if_type;
if (hw_event & ~CCI5xx_PMU_EVENT_MASK)
return -ENOENT;
switch (ev_source) {
case CCI5xx_PORT_S0:
case CCI5xx_PORT_S1:
case CCI5xx_PORT_S2:
case CCI5xx_PORT_S3:
case CCI5xx_PORT_S4:
case CCI5xx_PORT_S5:
case CCI5xx_PORT_S6:
if_type = CCI_IF_SLAVE;
break;
case CCI5xx_PORT_M0:
case CCI5xx_PORT_M1:
case CCI5xx_PORT_M2:
case CCI5xx_PORT_M3:
case CCI5xx_PORT_M4:
case CCI5xx_PORT_M5:
if_type = CCI_IF_MASTER;
break;
case CCI5xx_PORT_GLOBAL:
if_type = CCI_IF_GLOBAL;
break;
default:
return -ENOENT;
}
if (ev_code >= cci_pmu->model->event_ranges[if_type].min &&
ev_code <= cci_pmu->model->event_ranges[if_type].max)
return hw_event;
return -ENOENT;
}
/*
* CCI550 provides 8 independent event counters that can count
* any of the events available.
* CCI550 PMU event source ids
* 0x0-0x6 - Slave interfaces
* 0x8-0xe - Master interfaces
* 0xf - Global Events
* 0x7 - Reserved
*/
static int cci550_validate_hw_event(struct cci_pmu *cci_pmu,
unsigned long hw_event)
{
u32 ev_source = CCI5xx_PMU_EVENT_SOURCE(hw_event);
u32 ev_code = CCI5xx_PMU_EVENT_CODE(hw_event);
int if_type;
if (hw_event & ~CCI5xx_PMU_EVENT_MASK)
return -ENOENT;
switch (ev_source) {
case CCI5xx_PORT_S0:
case CCI5xx_PORT_S1:
case CCI5xx_PORT_S2:
case CCI5xx_PORT_S3:
case CCI5xx_PORT_S4:
case CCI5xx_PORT_S5:
case CCI5xx_PORT_S6:
if_type = CCI_IF_SLAVE;
break;
case CCI5xx_PORT_M0:
case CCI5xx_PORT_M1:
case CCI5xx_PORT_M2:
case CCI5xx_PORT_M3:
case CCI5xx_PORT_M4:
case CCI5xx_PORT_M5:
case CCI5xx_PORT_M6:
if_type = CCI_IF_MASTER;
break;
case CCI5xx_PORT_GLOBAL:
if_type = CCI_IF_GLOBAL;
break;
default:
return -ENOENT;
}
if (ev_code >= cci_pmu->model->event_ranges[if_type].min &&
ev_code <= cci_pmu->model->event_ranges[if_type].max)
return hw_event;
return -ENOENT;
}
#endif /* CONFIG_ARM_CCI5xx_PMU */
/*
* Program the CCI PMU counters which have PERF_HES_ARCH set
* with the event period and mark them ready before we enable
* PMU.
*/
static void cci_pmu_sync_counters(struct cci_pmu *cci_pmu)
{
int i;
struct cci_pmu_hw_events *cci_hw = &cci_pmu->hw_events;
DECLARE_BITMAP(mask, cci_pmu->num_cntrs);
bitmap_zero(mask, cci_pmu->num_cntrs);
for_each_set_bit(i, cci_pmu->hw_events.used_mask, cci_pmu->num_cntrs) {
struct perf_event *event = cci_hw->events[i];
if (WARN_ON(!event))
continue;
/* Leave the events which are not counting */
if (event->hw.state & PERF_HES_STOPPED)
continue;
if (event->hw.state & PERF_HES_ARCH) {
set_bit(i, mask);
event->hw.state &= ~PERF_HES_ARCH;
}
}
pmu_write_counters(cci_pmu, mask);
}
/* Should be called with cci_pmu->hw_events->pmu_lock held */
static void __cci_pmu_enable_nosync(struct cci_pmu *cci_pmu)
{
u32 val;
/* Enable all the PMU counters. */
val = readl_relaxed(cci_ctrl_base + CCI_PMCR) | CCI_PMCR_CEN;
writel(val, cci_ctrl_base + CCI_PMCR);
}
/* Should be called with cci_pmu->hw_events->pmu_lock held */
static void __cci_pmu_enable_sync(struct cci_pmu *cci_pmu)
{
cci_pmu_sync_counters(cci_pmu);
__cci_pmu_enable_nosync(cci_pmu);
}
/* Should be called with cci_pmu->hw_events->pmu_lock held */
static void __cci_pmu_disable(void)
{
u32 val;
/* Disable all the PMU counters. */
val = readl_relaxed(cci_ctrl_base + CCI_PMCR) & ~CCI_PMCR_CEN;
writel(val, cci_ctrl_base + CCI_PMCR);
}
static ssize_t cci_pmu_format_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_ext_attribute *eattr = container_of(attr,
struct dev_ext_attribute, attr);
return snprintf(buf, PAGE_SIZE, "%s\n", (char *)eattr->var);
}
static ssize_t cci_pmu_event_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_ext_attribute *eattr = container_of(attr,
struct dev_ext_attribute, attr);
/* source parameter is mandatory for normal PMU events */
return snprintf(buf, PAGE_SIZE, "source=?,event=0x%lx\n",
(unsigned long)eattr->var);
}
static int pmu_is_valid_counter(struct cci_pmu *cci_pmu, int idx)
{
return 0 <= idx && idx <= CCI_PMU_CNTR_LAST(cci_pmu);
}
static u32 pmu_read_register(struct cci_pmu *cci_pmu, int idx, unsigned int offset)
{
return readl_relaxed(cci_pmu->base +
CCI_PMU_CNTR_BASE(cci_pmu->model, idx) + offset);
}
static void pmu_write_register(struct cci_pmu *cci_pmu, u32 value,
int idx, unsigned int offset)
{
writel_relaxed(value, cci_pmu->base +
CCI_PMU_CNTR_BASE(cci_pmu->model, idx) + offset);
}
static void pmu_disable_counter(struct cci_pmu *cci_pmu, int idx)
{
pmu_write_register(cci_pmu, 0, idx, CCI_PMU_CNTR_CTRL);
}
static void pmu_enable_counter(struct cci_pmu *cci_pmu, int idx)
{
pmu_write_register(cci_pmu, 1, idx, CCI_PMU_CNTR_CTRL);
}
static bool __maybe_unused
pmu_counter_is_enabled(struct cci_pmu *cci_pmu, int idx)
{
return (pmu_read_register(cci_pmu, idx, CCI_PMU_CNTR_CTRL) & 0x1) != 0;
}
static void pmu_set_event(struct cci_pmu *cci_pmu, int idx, unsigned long event)
{
pmu_write_register(cci_pmu, event, idx, CCI_PMU_EVT_SEL);
}
/*
* For all counters on the CCI-PMU, disable any 'enabled' counters,
* saving the changed counters in the mask, so that we can restore
* it later using pmu_restore_counters. The mask is private to the
* caller. We cannot rely on the used_mask maintained by the CCI_PMU
* as it only tells us if the counter is assigned to perf_event or not.
* The state of the perf_event cannot be locked by the PMU layer, hence
* we check the individual counter status (which can be locked by
* cci_pm->hw_events->pmu_lock).
*
* @mask should be initialised to empty by the caller.
*/
static void __maybe_unused
pmu_save_counters(struct cci_pmu *cci_pmu, unsigned long *mask)
{
int i;
for (i = 0; i < cci_pmu->num_cntrs; i++) {
if (pmu_counter_is_enabled(cci_pmu, i)) {
set_bit(i, mask);
pmu_disable_counter(cci_pmu, i);
}
}
}
/*
* Restore the status of the counters. Reversal of the pmu_save_counters().
* For each counter set in the mask, enable the counter back.
*/
static void __maybe_unused
pmu_restore_counters(struct cci_pmu *cci_pmu, unsigned long *mask)
{
int i;
for_each_set_bit(i, mask, cci_pmu->num_cntrs)
pmu_enable_counter(cci_pmu, i);
}
/*
* Returns the number of programmable counters actually implemented
* by the cci
*/
static u32 pmu_get_max_counters(void)
{
return (readl_relaxed(cci_ctrl_base + CCI_PMCR) &
CCI_PMCR_NCNT_MASK) >> CCI_PMCR_NCNT_SHIFT;
}
static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
unsigned long cci_event = event->hw.config_base;
int idx;
if (cci_pmu->model->get_event_idx)
return cci_pmu->model->get_event_idx(cci_pmu, hw, cci_event);
/* Generic code to find an unused idx from the mask */
for(idx = 0; 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)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
if (event->attr.type < PERF_TYPE_MAX ||
!cci_pmu->model->validate_hw_event)
return -ENOENT;
return cci_pmu->model->validate_hw_event(cci_pmu, event->attr.config);
}
static int pmu_request_irq(struct cci_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 (cci_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 < cci_pmu->nr_irqs; i++) {
int err = request_irq(cci_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",
cci_pmu->irqs[i]);
return err;
}
set_bit(i, &cci_pmu->active_irqs);
}
return 0;
}
static void pmu_free_irq(struct cci_pmu *cci_pmu)
{
int i;
for (i = 0; i < cci_pmu->nr_irqs; i++) {
if (!test_and_clear_bit(i, &cci_pmu->active_irqs))
continue;
free_irq(cci_pmu->irqs[i], cci_pmu);
}
}
static u32 pmu_read_counter(struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_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(cci_pmu, idx, CCI_PMU_CNTR);
return value;
}
static void pmu_write_counter(struct cci_pmu *cci_pmu, u32 value, int idx)
{
pmu_write_register(cci_pmu, value, idx, CCI_PMU_CNTR);
}
static void __pmu_write_counters(struct cci_pmu *cci_pmu, unsigned long *mask)
{
int i;
struct cci_pmu_hw_events *cci_hw = &cci_pmu->hw_events;
for_each_set_bit(i, mask, cci_pmu->num_cntrs) {
struct perf_event *event = cci_hw->events[i];
if (WARN_ON(!event))
continue;
pmu_write_counter(cci_pmu, local64_read(&event->hw.prev_count), i);
}
}
static void pmu_write_counters(struct cci_pmu *cci_pmu, unsigned long *mask)
{
if (cci_pmu->model->write_counters)
cci_pmu->model->write_counters(cci_pmu, mask);
else
__pmu_write_counters(cci_pmu, mask);
}
#ifdef CONFIG_ARM_CCI5xx_PMU
/*
* CCI-500/CCI-550 has advanced power saving policies, which could gate the
* clocks to the PMU counters, which makes the writes to them ineffective.
* The only way to write to those counters is when the global counters
* are enabled and the particular counter is enabled.
*
* So we do the following :
*
* 1) Disable all the PMU counters, saving their current state
* 2) Enable the global PMU profiling, now that all counters are
* disabled.
*
* For each counter to be programmed, repeat steps 3-7:
*
* 3) Write an invalid event code to the event control register for the
counter, so that the counters are not modified.
* 4) Enable the counter control for the counter.
* 5) Set the counter value
* 6) Disable the counter
* 7) Restore the event in the target counter
*
* 8) Disable the global PMU.
* 9) Restore the status of the rest of the counters.
*
* We choose an event which for CCI-5xx is guaranteed not to count.
* We use the highest possible event code (0x1f) for the master interface 0.
*/
#define CCI5xx_INVALID_EVENT ((CCI5xx_PORT_M0 << CCI5xx_PMU_EVENT_SOURCE_SHIFT) | \
(CCI5xx_PMU_EVENT_CODE_MASK << CCI5xx_PMU_EVENT_CODE_SHIFT))
static void cci5xx_pmu_write_counters(struct cci_pmu *cci_pmu, unsigned long *mask)
{
int i;
DECLARE_BITMAP(saved_mask, cci_pmu->num_cntrs);
bitmap_zero(saved_mask, cci_pmu->num_cntrs);
pmu_save_counters(cci_pmu, saved_mask);
/*
* Now that all the counters are disabled, we can safely turn the PMU on,
* without syncing the status of the counters
*/
__cci_pmu_enable_nosync(cci_pmu);
for_each_set_bit(i, mask, cci_pmu->num_cntrs) {
struct perf_event *event = cci_pmu->hw_events.events[i];
if (WARN_ON(!event))
continue;
pmu_set_event(cci_pmu, i, CCI5xx_INVALID_EVENT);
pmu_enable_counter(cci_pmu, i);
pmu_write_counter(cci_pmu, local64_read(&event->hw.prev_count), i);
pmu_disable_counter(cci_pmu, i);
pmu_set_event(cci_pmu, i, event->hw.config_base);
}
__cci_pmu_disable();
pmu_restore_counters(cci_pmu, saved_mask);
}
#endif /* CONFIG_ARM_CCI5xx_PMU */
static u64 pmu_event_update(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
u64 delta, prev_raw_count, new_raw_count;
do {
prev_raw_count = local64_read(&hwc->prev_count);
new_raw_count = pmu_read_counter(event);
} while (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
new_raw_count) != prev_raw_count);
delta = (new_raw_count - prev_raw_count) & CCI_PMU_CNTR_MASK;
local64_add(delta, &event->count);
return new_raw_count;
}
static void pmu_read(struct perf_event *event)
{
pmu_event_update(event);
}
static void pmu_event_set_period(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
/*
* The CCI PMU counters have a period of 2^32. To account for the
* possiblity of extreme interrupt latency we program for a period of
* half that. Hopefully we can handle the interrupt before another 2^31
* events occur and the counter overtakes its previous value.
*/
u64 val = 1ULL << 31;
local64_set(&hwc->prev_count, val);
/*
* CCI PMU uses PERF_HES_ARCH to keep track of the counters, whose
* values needs to be sync-ed with the s/w state before the PMU is
* enabled.
* Mark this counter for sync.
*/
hwc->state |= PERF_HES_ARCH;
}
static irqreturn_t pmu_handle_irq(int irq_num, void *dev)
{
unsigned long flags;
struct cci_pmu *cci_pmu = dev;
struct cci_pmu_hw_events *events = &cci_pmu->hw_events;
int idx, handled = IRQ_NONE;
raw_spin_lock_irqsave(&events->pmu_lock, flags);
/* Disable the PMU while we walk through the counters */
__cci_pmu_disable();
/*
* 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 = 0; idx <= CCI_PMU_CNTR_LAST(cci_pmu); idx++) {
struct perf_event *event = events->events[idx];
if (!event)
continue;
/* Did this counter overflow? */
if (!(pmu_read_register(cci_pmu, idx, CCI_PMU_OVRFLW) &
CCI_PMU_OVRFLW_FLAG))
continue;
pmu_write_register(cci_pmu, CCI_PMU_OVRFLW_FLAG, idx,
CCI_PMU_OVRFLW);
pmu_event_update(event);
pmu_event_set_period(event);
handled = IRQ_HANDLED;
}
/* Enable the PMU and sync possibly overflowed counters */
__cci_pmu_enable_sync(cci_pmu);
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
return IRQ_RETVAL(handled);
}
static int cci_pmu_get_hw(struct cci_pmu *cci_pmu)
{
int ret = pmu_request_irq(cci_pmu, pmu_handle_irq);
if (ret) {
pmu_free_irq(cci_pmu);
return ret;
}
return 0;
}
static void cci_pmu_put_hw(struct cci_pmu *cci_pmu)
{
pmu_free_irq(cci_pmu);
}
static void hw_perf_event_destroy(struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
atomic_t *active_events = &cci_pmu->active_events;
struct mutex *reserve_mutex = &cci_pmu->reserve_mutex;
if (atomic_dec_and_mutex_lock(active_events, reserve_mutex)) {
cci_pmu_put_hw(cci_pmu);
mutex_unlock(reserve_mutex);
}
}
static void cci_pmu_enable(struct pmu *pmu)
{
struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
int enabled = bitmap_weight(hw_events->used_mask, cci_pmu->num_cntrs);
unsigned long flags;
if (!enabled)
return;
raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
__cci_pmu_enable_sync(cci_pmu);
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}
static void cci_pmu_disable(struct pmu *pmu)
{
struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
unsigned long flags;
raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
__cci_pmu_disable();
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}
/*
* Check if the idx represents a non-programmable counter.
* All the fixed event counters are mapped before the programmable
* counters.
*/
static bool pmu_fixed_hw_idx(struct cci_pmu *cci_pmu, int idx)
{
return (idx >= 0) && (idx < cci_pmu->model->fixed_hw_cntrs);
}
static void cci_pmu_start(struct perf_event *event, int pmu_flags)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
unsigned long flags;
/*
* To handle interrupt latency, we always reprogram the period
* regardlesss of PERF_EF_RELOAD.
*/
if (pmu_flags & PERF_EF_RELOAD)
WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
hwc->state = 0;
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(&hw_events->pmu_lock, flags);
/* Configure the counter unless you are counting a fixed event */
if (!pmu_fixed_hw_idx(cci_pmu, idx))
pmu_set_event(cci_pmu, idx, hwc->config_base);
pmu_event_set_period(event);
pmu_enable_counter(cci_pmu, idx);
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}
static void cci_pmu_stop(struct perf_event *event, int pmu_flags)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
if (hwc->state & PERF_HES_STOPPED)
return;
if (unlikely(!pmu_is_valid_counter(cci_pmu, idx))) {
dev_err(&cci_pmu->plat_device->dev, "Invalid CCI PMU counter %d\n", idx);
return;
}
/*
* We always reprogram the counter, so ignore PERF_EF_UPDATE. See
* cci_pmu_start()
*/
pmu_disable_counter(cci_pmu, idx);
pmu_event_update(event);
hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
}
static int cci_pmu_add(struct perf_event *event, int flags)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
struct hw_perf_event *hwc = &event->hw;
int idx;
int err = 0;
perf_pmu_disable(event->pmu);
/* If we don't have a space for the counter then finish early. */
idx = pmu_get_event_idx(hw_events, event);
if (idx < 0) {
err = idx;
goto out;
}
event->hw.idx = idx;
hw_events->events[idx] = event;
hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
if (flags & PERF_EF_START)
cci_pmu_start(event, PERF_EF_RELOAD);
/* Propagate our changes to the userspace mapping. */
perf_event_update_userpage(event);
out:
perf_pmu_enable(event->pmu);
return err;
}
static void cci_pmu_del(struct perf_event *event, int flags)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
cci_pmu_stop(event, PERF_EF_UPDATE);
hw_events->events[idx] = NULL;
clear_bit(idx, hw_events->used_mask);
perf_event_update_userpage(event);
}
static int
validate_event(struct pmu *cci_pmu,
struct cci_pmu_hw_events *hw_events,
struct perf_event *event)
{
if (is_software_event(event))
return 1;
/*
* Reject groups spanning multiple HW PMUs (e.g. CPU + CCI). The
* core perf code won't check that the pmu->ctx == leader->ctx
* until after pmu->event_init(event).
*/
if (event->pmu != cci_pmu)
return 0;
if (event->state < PERF_EVENT_STATE_OFF)
return 1;
if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec)
return 1;
return pmu_get_event_idx(hw_events, event) >= 0;
}
static int
validate_group(struct perf_event *event)
{
struct perf_event *sibling, *leader = event->group_leader;
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
unsigned long mask[BITS_TO_LONGS(cci_pmu->num_cntrs)];
struct cci_pmu_hw_events fake_pmu = {
/*
* Initialise the fake PMU. We only need to populate the
* used_mask for the purposes of validation.
*/
.used_mask = mask,
};
memset(mask, 0, BITS_TO_LONGS(cci_pmu->num_cntrs) * sizeof(unsigned long));
if (!validate_event(event->pmu, &fake_pmu, leader))
return -EINVAL;
list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
if (!validate_event(event->pmu, &fake_pmu, sibling))
return -EINVAL;
}
if (!validate_event(event->pmu, &fake_pmu, event))
return -EINVAL;
return 0;
}
static int
__hw_perf_event_init(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
int mapping;
mapping = pmu_map_event(event);
if (mapping < 0) {
pr_debug("event %x:%llx not supported\n", event->attr.type,
event->attr.config);
return mapping;
}
/*
* We don't assign an index until we actually place the event onto
* hardware. Use -1 to signify that we haven't decided where to put it
* yet.
*/
hwc->idx = -1;
hwc->config_base = 0;
hwc->config = 0;
hwc->event_base = 0;
/*
* Store the event encoding into the config_base field.
*/
hwc->config_base |= (unsigned long)mapping;
/*
* Limit the sample_period to half of the counter width. That way, the
* new counter value is far less likely to overtake the previous one
* unless you have some serious IRQ latency issues.
*/
hwc->sample_period = CCI_PMU_CNTR_MASK >> 1;
hwc->last_period = hwc->sample_period;
local64_set(&hwc->period_left, hwc->sample_period);
if (event->group_leader != event) {
if (validate_group(event) != 0)
return -EINVAL;
}
return 0;
}
static int cci_pmu_event_init(struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
atomic_t *active_events = &cci_pmu->active_events;
int err = 0;
int cpu;
if (event->attr.type != event->pmu->type)
return -ENOENT;
/* Shared by all CPUs, no meaningful state to sample */
if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
return -EOPNOTSUPP;
/* We have no filtering of any kind */
if (event->attr.exclude_user ||
event->attr.exclude_kernel ||
event->attr.exclude_hv ||
event->attr.exclude_idle ||
event->attr.exclude_host ||
event->attr.exclude_guest)
return -EINVAL;
/*
* Following the example set by other "uncore" PMUs, we accept any CPU
* and rewrite its affinity dynamically rather than having perf core
* handle cpu == -1 and pid == -1 for this case.
*
* The perf core will pin online CPUs for the duration of this call and
* the event being installed into its context, so the PMU's CPU can't
* change under our feet.
*/
cpu = cpumask_first(&cci_pmu->cpus);
if (event->cpu < 0 || cpu < 0)
return -EINVAL;
event->cpu = cpu;
event->destroy = hw_perf_event_destroy;
if (!atomic_inc_not_zero(active_events)) {
mutex_lock(&cci_pmu->reserve_mutex);
if (atomic_read(active_events) == 0)
err = cci_pmu_get_hw(cci_pmu);
if (!err)
atomic_inc(active_events);
mutex_unlock(&cci_pmu->reserve_mutex);
}
if (err)
return err;
err = __hw_perf_event_init(event);
if (err)
hw_perf_event_destroy(event);
return err;
}
static ssize_t pmu_cpumask_attr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pmu *pmu = dev_get_drvdata(dev);
struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
int n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
cpumask_pr_args(&cci_pmu->cpus));
buf[n++] = '\n';
buf[n] = '\0';
return n;
}
static struct device_attribute pmu_cpumask_attr =
__ATTR(cpumask, S_IRUGO, pmu_cpumask_attr_show, NULL);
static struct attribute *pmu_attrs[] = {
&pmu_cpumask_attr.attr,
NULL,
};
static struct attribute_group pmu_attr_group = {
.attrs = pmu_attrs,
};
static struct attribute_group pmu_format_attr_group = {
.name = "format",
.attrs = NULL, /* Filled in cci_pmu_init_attrs */
};
static struct attribute_group pmu_event_attr_group = {
.name = "events",
.attrs = NULL, /* Filled in cci_pmu_init_attrs */
};
static const struct attribute_group *pmu_attr_groups[] = {
&pmu_attr_group,
&pmu_format_attr_group,
&pmu_event_attr_group,
NULL
};
static int cci_pmu_init(struct cci_pmu *cci_pmu, struct platform_device *pdev)
{
const struct cci_pmu_model *model = cci_pmu->model;
char *name = model->name;
u32 num_cntrs;
pmu_event_attr_group.attrs = model->event_attrs;
pmu_format_attr_group.attrs = model->format_attrs;
cci_pmu->pmu = (struct pmu) {
.name = cci_pmu->model->name,
.task_ctx_nr = perf_invalid_context,
.pmu_enable = cci_pmu_enable,
.pmu_disable = cci_pmu_disable,
.event_init = cci_pmu_event_init,
.add = cci_pmu_add,
.del = cci_pmu_del,
.start = cci_pmu_start,
.stop = cci_pmu_stop,
.read = pmu_read,
.attr_groups = pmu_attr_groups,
};
cci_pmu->plat_device = pdev;
num_cntrs = pmu_get_max_counters();
if (num_cntrs > cci_pmu->model->num_hw_cntrs) {
dev_warn(&pdev->dev,
"PMU implements more counters(%d) than supported by"
" the model(%d), truncated.",
num_cntrs, cci_pmu->model->num_hw_cntrs);
num_cntrs = cci_pmu->model->num_hw_cntrs;
}
cci_pmu->num_cntrs = num_cntrs + cci_pmu->model->fixed_hw_cntrs;
return perf_pmu_register(&cci_pmu->pmu, name, -1);
}
static int cci_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
{
struct cci_pmu *cci_pmu = hlist_entry_safe(node, struct cci_pmu, node);
unsigned int target;
if (!cpumask_test_and_clear_cpu(cpu, &cci_pmu->cpus))
return 0;
target = cpumask_any_but(cpu_online_mask, cpu);
if (target >= nr_cpu_ids)
return 0;
/*
* TODO: migrate context once core races on event->ctx have
* been fixed.
*/
cpumask_set_cpu(target, &cci_pmu->cpus);
return 0;
}
static struct cci_pmu_model cci_pmu_models[] = {
#ifdef CONFIG_ARM_CCI400_PMU
[CCI400_R0] = {
.name = "CCI_400",
.fixed_hw_cntrs = 1, /* Cycle counter */
.num_hw_cntrs = 4,
.cntr_size = SZ_4K,
.format_attrs = cci400_pmu_format_attrs,
.event_attrs = cci400_r0_pmu_event_attrs,
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI400_R0_SLAVE_PORT_MIN_EV,
CCI400_R0_SLAVE_PORT_MAX_EV,
},
[CCI_IF_MASTER] = {
CCI400_R0_MASTER_PORT_MIN_EV,
CCI400_R0_MASTER_PORT_MAX_EV,
},
},
.validate_hw_event = cci400_validate_hw_event,
.get_event_idx = cci400_get_event_idx,
},
[CCI400_R1] = {
.name = "CCI_400_r1",
.fixed_hw_cntrs = 1, /* Cycle counter */
.num_hw_cntrs = 4,
.cntr_size = SZ_4K,
.format_attrs = cci400_pmu_format_attrs,
.event_attrs = cci400_r1_pmu_event_attrs,
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI400_R1_SLAVE_PORT_MIN_EV,
CCI400_R1_SLAVE_PORT_MAX_EV,
},
[CCI_IF_MASTER] = {
CCI400_R1_MASTER_PORT_MIN_EV,
CCI400_R1_MASTER_PORT_MAX_EV,
},
},
.validate_hw_event = cci400_validate_hw_event,
.get_event_idx = cci400_get_event_idx,
},
#endif
#ifdef CONFIG_ARM_CCI5xx_PMU
[CCI500_R0] = {
.name = "CCI_500",
.fixed_hw_cntrs = 0,
.num_hw_cntrs = 8,
.cntr_size = SZ_64K,
.format_attrs = cci5xx_pmu_format_attrs,
.event_attrs = cci5xx_pmu_event_attrs,
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI5xx_SLAVE_PORT_MIN_EV,
CCI5xx_SLAVE_PORT_MAX_EV,
},
[CCI_IF_MASTER] = {
CCI5xx_MASTER_PORT_MIN_EV,
CCI5xx_MASTER_PORT_MAX_EV,
},
[CCI_IF_GLOBAL] = {
CCI5xx_GLOBAL_PORT_MIN_EV,
CCI5xx_GLOBAL_PORT_MAX_EV,
},
},
.validate_hw_event = cci500_validate_hw_event,
.write_counters = cci5xx_pmu_write_counters,
},
[CCI550_R0] = {
.name = "CCI_550",
.fixed_hw_cntrs = 0,
.num_hw_cntrs = 8,
.cntr_size = SZ_64K,
.format_attrs = cci5xx_pmu_format_attrs,
.event_attrs = cci5xx_pmu_event_attrs,
.event_ranges = {
[CCI_IF_SLAVE] = {
CCI5xx_SLAVE_PORT_MIN_EV,
CCI5xx_SLAVE_PORT_MAX_EV,
},
[CCI_IF_MASTER] = {
CCI5xx_MASTER_PORT_MIN_EV,
CCI5xx_MASTER_PORT_MAX_EV,
},
[CCI_IF_GLOBAL] = {
CCI5xx_GLOBAL_PORT_MIN_EV,
CCI5xx_GLOBAL_PORT_MAX_EV,
},
},
.validate_hw_event = cci550_validate_hw_event,
.write_counters = cci5xx_pmu_write_counters,
},
#endif
};
static const struct of_device_id arm_cci_pmu_matches[] = {
#ifdef CONFIG_ARM_CCI400_PMU
{
.compatible = "arm,cci-400-pmu",
.data = NULL,
},
{
.compatible = "arm,cci-400-pmu,r0",
.data = &cci_pmu_models[CCI400_R0],
},
{
.compatible = "arm,cci-400-pmu,r1",
.data = &cci_pmu_models[CCI400_R1],
},
#endif
#ifdef CONFIG_ARM_CCI5xx_PMU
{
.compatible = "arm,cci-500-pmu,r0",
.data = &cci_pmu_models[CCI500_R0],
},
{
.compatible = "arm,cci-550-pmu,r0",
.data = &cci_pmu_models[CCI550_R0],
},
#endif
{},
};
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, "DEPRECATED 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;
for (i = 0; i < nr_irqs; i++)
if (irq == irqs[i])
return true;
return false;
}
static struct cci_pmu *cci_pmu_alloc(struct platform_device *pdev)
{
struct cci_pmu *cci_pmu;
const struct cci_pmu_model *model;
/*
* All allocations are devm_* hence we don't have to free
* them explicitly on an error, as it would end up in driver
* detach.
*/
model = get_cci_model(pdev);
if (!model) {
dev_warn(&pdev->dev, "CCI PMU version not supported\n");
return ERR_PTR(-ENODEV);
}
cci_pmu = devm_kzalloc(&pdev->dev, sizeof(*cci_pmu), GFP_KERNEL);
if (!cci_pmu)
return ERR_PTR(-ENOMEM);
cci_pmu->model = model;
cci_pmu->irqs = devm_kcalloc(&pdev->dev, CCI_PMU_MAX_HW_CNTRS(model),
sizeof(*cci_pmu->irqs), GFP_KERNEL);
if (!cci_pmu->irqs)
return ERR_PTR(-ENOMEM);
cci_pmu->hw_events.events = devm_kcalloc(&pdev->dev,
CCI_PMU_MAX_HW_CNTRS(model),
sizeof(*cci_pmu->hw_events.events),
GFP_KERNEL);
if (!cci_pmu->hw_events.events)
return ERR_PTR(-ENOMEM);
cci_pmu->hw_events.used_mask = devm_kcalloc(&pdev->dev,
BITS_TO_LONGS(CCI_PMU_MAX_HW_CNTRS(model)),
sizeof(*cci_pmu->hw_events.used_mask),
GFP_KERNEL);
if (!cci_pmu->hw_events.used_mask)
return ERR_PTR(-ENOMEM);
return cci_pmu;
}
static int cci_pmu_probe(struct platform_device *pdev)
{
struct resource *res;
struct cci_pmu *cci_pmu;
int i, ret, irq;
cci_pmu = cci_pmu_alloc(pdev);
if (IS_ERR(cci_pmu))
return PTR_ERR(cci_pmu);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
cci_pmu->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(cci_pmu->base))
return -ENOMEM;
/*
* CCI PMU has one overflow interrupt per counter; but some may be tied
* together to a common interrupt.
*/
cci_pmu->nr_irqs = 0;
for (i = 0; i < CCI_PMU_MAX_HW_CNTRS(cci_pmu->model); i++) {
irq = platform_get_irq(pdev, i);
if (irq < 0)
break;
if (is_duplicate_irq(irq, cci_pmu->irqs, cci_pmu->nr_irqs))
continue;
cci_pmu->irqs[cci_pmu->nr_irqs++] = irq;
}
/*
* Ensure that the device tree has as many interrupts as the number
* of counters.
*/
if (i < CCI_PMU_MAX_HW_CNTRS(cci_pmu->model)) {
dev_warn(&pdev->dev, "In-correct number of interrupts: %d, should be %d\n",
i, CCI_PMU_MAX_HW_CNTRS(cci_pmu->model));
return -EINVAL;
}
raw_spin_lock_init(&cci_pmu->hw_events.pmu_lock);
mutex_init(&cci_pmu->reserve_mutex);
atomic_set(&cci_pmu->active_events, 0);
cpumask_set_cpu(smp_processor_id(), &cci_pmu->cpus);
ret = cci_pmu_init(cci_pmu, pdev);
if (ret)
return ret;
cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CCI_ONLINE,
&cci_pmu->node);
pr_info("ARM %s PMU driver probed", cci_pmu->model->name);
return 0;
}
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);
}
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 = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_CCI_ONLINE,
"AP_PERF_ARM_CCI_ONLINE", NULL,
cci_pmu_offline_cpu);
if (ret)
return ret;
ret = platform_driver_register(&cci_pmu_driver);
if (ret)
return ret;
return platform_driver_register(&cci_platform_driver);
}
#else /* !CONFIG_ARM_CCI_PMU */
static int __init cci_platform_init(void)
{
return 0;
}
#endif /* CONFIG_ARM_CCI_PMU */
#ifdef CONFIG_ARM_CCI400_PORT_CTRL
#define CCI_PORT_CTRL 0x0
#define CCI_CTRL_STATUS 0xc
#define CCI_ENABLE_SNOOP_REQ 0x1
#define CCI_ENABLE_DVM_REQ 0x2
#define CCI_ENABLE_REQ (CCI_ENABLE_SNOOP_REQ | CCI_ENABLE_DVM_REQ)
enum cci_ace_port_type {
ACE_INVALID_PORT = 0x0,
ACE_PORT,
ACE_LITE_PORT,
};
struct cci_ace_port {
void __iomem *base;
unsigned long phys;
enum cci_ace_port_type type;
struct device_node *dn;
};
static struct cci_ace_port *ports;
static unsigned int nb_cci_ports;
struct cpu_port {
u64 mpidr;
u32 port;
};
/*
* Use the port MSB as valid flag, shift can be made dynamic
* by computing number of bits required for port indexes.
* Code disabling CCI cpu ports runs with D-cache invalidated
* and SCTLR bit clear so data accesses must be kept to a minimum
* to improve performance; for now shift is left static to
* avoid one more data access while disabling the CCI port.
*/
#define PORT_VALID_SHIFT 31
#define PORT_VALID (0x1 << PORT_VALID_SHIFT)
static inline void init_cpu_port(struct cpu_port *port, u32 index, u64 mpidr)
{
port->port = PORT_VALID | index;
port->mpidr = mpidr;
}
static inline bool cpu_port_is_valid(struct cpu_port *port)
{
return !!(port->port & PORT_VALID);
}
static inline bool cpu_port_match(struct cpu_port *port, u64 mpidr)
{
return port->mpidr == (mpidr & MPIDR_HWID_BITMASK);
}
static struct cpu_port cpu_port[NR_CPUS];
/**
* __cci_ace_get_port - Function to retrieve the port index connected to
* a cpu or device.
*
* @dn: device node of the device to look-up
* @type: port type
*
* Return value:
* - CCI port index if success
* - -ENODEV if failure
*/
static int __cci_ace_get_port(struct device_node *dn, int type)
{
int i;
bool ace_match;
struct device_node *cci_portn;
cci_portn = of_parse_phandle(dn, "cci-control-port", 0);
for (i = 0; i < nb_cci_ports; i++) {
ace_match = ports[i].type == type;
if (ace_match && cci_portn == ports[i].dn)
return i;
}
return -ENODEV;
}
int cci_ace_get_port(struct device_node *dn)
{
return __cci_ace_get_port(dn, ACE_LITE_PORT);
}
EXPORT_SYMBOL_GPL(cci_ace_get_port);
static void cci_ace_init_ports(void)
{
int port, cpu;
struct device_node *cpun;
/*
* Port index look-up speeds up the function disabling ports by CPU,
* since the logical to port index mapping is done once and does
* not change after system boot.
* The stashed index array is initialized for all possible CPUs
* at probe time.
*/
for_each_possible_cpu(cpu) {
/* too early to use cpu->of_node */
cpun = of_get_cpu_node(cpu, NULL);
if (WARN(!cpun, "Missing cpu device node\n"))
continue;
port = __cci_ace_get_port(cpun, ACE_PORT);
if (port < 0)
continue;
init_cpu_port(&cpu_port[cpu], port, cpu_logical_map(cpu));
}
for_each_possible_cpu(cpu) {
WARN(!cpu_port_is_valid(&cpu_port[cpu]),
"CPU %u does not have an associated CCI port\n",
cpu);
}
}
/*
* Functions to enable/disable a CCI interconnect slave port
*
* They are called by low-level power management code to disable slave
* interfaces snoops and DVM broadcast.
* Since they may execute with cache data allocation disabled and
* after the caches have been cleaned and invalidated the functions provide
* no explicit locking since they may run with D-cache disabled, so normal
* cacheable kernel locks based on ldrex/strex may not work.
* Locking has to be provided by BSP implementations to ensure proper
* operations.
*/
/**
* cci_port_control() - function to control a CCI port
*
* @port: index of the port to setup
* @enable: if true enables the port, if false disables it
*/
static void notrace cci_port_control(unsigned int port, bool enable)
{
void __iomem *base = ports[port].base;
writel_relaxed(enable ? CCI_ENABLE_REQ : 0, base + CCI_PORT_CTRL);
/*
* This function is called from power down procedures
* and must not execute any instruction that might
* cause the processor to be put in a quiescent state
* (eg wfi). Hence, cpu_relax() can not be added to this
* read loop to optimize power, since it might hide possibly
* disruptive operations.
*/
while (readl_relaxed(cci_ctrl_base + CCI_CTRL_STATUS) & 0x1)
;
}
/**
* cci_disable_port_by_cpu() - function to disable a CCI port by CPU
* reference
*
* @mpidr: mpidr of the CPU whose CCI port should be disabled
*
* Disabling a CCI port for a CPU implies disabling the CCI port
* controlling that CPU cluster. Code disabling CPU CCI ports
* must make sure that the CPU running the code is the last active CPU
* in the cluster ie all other CPUs are quiescent in a low power state.
*
* Return:
* 0 on success
* -ENODEV on port look-up failure
*/
int notrace cci_disable_port_by_cpu(u64 mpidr)
{
int cpu;
bool is_valid;
for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
is_valid = cpu_port_is_valid(&cpu_port[cpu]);
if (is_valid && cpu_port_match(&cpu_port[cpu], mpidr)) {
cci_port_control(cpu_port[cpu].port, false);
return 0;
}
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(cci_disable_port_by_cpu);
/**
* cci_enable_port_for_self() - enable a CCI port for calling CPU
*
* Enabling a CCI port for the calling CPU implies enabling the CCI
* port controlling that CPU's cluster. Caller must make sure that the
* CPU running the code is the first active CPU in the cluster and all
* other CPUs are quiescent in a low power state or waiting for this CPU
* to complete the CCI initialization.
*
* Because this is called when the MMU is still off and with no stack,
* the code must be position independent and ideally rely on callee
* clobbered registers only. To achieve this we must code this function
* entirely in assembler.
*
* On success this returns with the proper CCI port enabled. In case of
* any failure this never returns as the inability to enable the CCI is
* fatal and there is no possible recovery at this stage.
*/
asmlinkage void __naked cci_enable_port_for_self(void)
{
asm volatile ("\n"
" .arch armv7-a\n"
" mrc p15, 0, r0, c0, c0, 5 @ get MPIDR value \n"
" and r0, r0, #"__stringify(MPIDR_HWID_BITMASK)" \n"
" adr r1, 5f \n"
" ldr r2, [r1] \n"
" add r1, r1, r2 @ &cpu_port \n"
" add ip, r1, %[sizeof_cpu_port] \n"
/* Loop over the cpu_port array looking for a matching MPIDR */
"1: ldr r2, [r1, %[offsetof_cpu_port_mpidr_lsb]] \n"
" cmp r2, r0 @ compare MPIDR \n"
" bne 2f \n"
/* Found a match, now test port validity */
" ldr r3, [r1, %[offsetof_cpu_port_port]] \n"
" tst r3, #"__stringify(PORT_VALID)" \n"
" bne 3f \n"
/* no match, loop with the next cpu_port entry */
"2: add r1, r1, %[sizeof_struct_cpu_port] \n"
" cmp r1, ip @ done? \n"
" blo 1b \n"
/* CCI port not found -- cheaply try to stall this CPU */
"cci_port_not_found: \n"
" wfi \n"
" wfe \n"
" b cci_port_not_found \n"
/* Use matched port index to look up the corresponding ports entry */
"3: bic r3, r3, #"__stringify(PORT_VALID)" \n"
" adr r0, 6f \n"
" ldmia r0, {r1, r2} \n"
" sub r1, r1, r0 @ virt - phys \n"
" ldr r0, [r0, r2] @ *(&ports) \n"
" mov r2, %[sizeof_struct_ace_port] \n"
" mla r0, r2, r3, r0 @ &ports[index] \n"
" sub r0, r0, r1 @ virt_to_phys() \n"
/* Enable the CCI port */
" ldr r0, [r0, %[offsetof_port_phys]] \n"
" mov r3, %[cci_enable_req]\n"
" str r3, [r0, #"__stringify(CCI_PORT_CTRL)"] \n"
/* poll the status reg for completion */
" adr r1, 7f \n"
" ldr r0, [r1] \n"
" ldr r0, [r0, r1] @ cci_ctrl_base \n"
"4: ldr r1, [r0, #"__stringify(CCI_CTRL_STATUS)"] \n"
" tst r1, %[cci_control_status_bits] \n"
" bne 4b \n"
" mov r0, #0 \n"
" bx lr \n"
" .align 2 \n"
"5: .word cpu_port - . \n"
"6: .word . \n"
" .word ports - 6b \n"
"7: .word cci_ctrl_phys - . \n"
: :
[sizeof_cpu_port] "i" (sizeof(cpu_port)),
[cci_enable_req] "i" cpu_to_le32(CCI_ENABLE_REQ),
[cci_control_status_bits] "i" cpu_to_le32(1),
#ifndef __ARMEB__
[offsetof_cpu_port_mpidr_lsb] "i" (offsetof(struct cpu_port, mpidr)),
#else
[offsetof_cpu_port_mpidr_lsb] "i" (offsetof(struct cpu_port, mpidr)+4),
#endif
[offsetof_cpu_port_port] "i" (offsetof(struct cpu_port, port)),
[sizeof_struct_cpu_port] "i" (sizeof(struct cpu_port)),
[sizeof_struct_ace_port] "i" (sizeof(struct cci_ace_port)),
[offsetof_port_phys] "i" (offsetof(struct cci_ace_port, phys)) );
unreachable();
}
/**
* __cci_control_port_by_device() - function to control a CCI port by device
* reference
*
* @dn: device node pointer of the device whose CCI port should be
* controlled
* @enable: if true enables the port, if false disables it
*
* Return:
* 0 on success
* -ENODEV on port look-up failure
*/
int notrace __cci_control_port_by_device(struct device_node *dn, bool enable)
{
int port;
if (!dn)
return -ENODEV;
port = __cci_ace_get_port(dn, ACE_LITE_PORT);
if (WARN_ONCE(port < 0, "node %s ACE lite port look-up failure\n",
dn->full_name))
return -ENODEV;
cci_port_control(port, enable);
return 0;
}
EXPORT_SYMBOL_GPL(__cci_control_port_by_device);
/**
* __cci_control_port_by_index() - function to control a CCI port by port index
*
* @port: port index previously retrieved with cci_ace_get_port()
* @enable: if true enables the port, if false disables it
*
* Return:
* 0 on success
* -ENODEV on port index out of range
* -EPERM if operation carried out on an ACE PORT
*/
int notrace __cci_control_port_by_index(u32 port, bool enable)
{
if (port >= nb_cci_ports || ports[port].type == ACE_INVALID_PORT)
return -ENODEV;
/*
* CCI control for ports connected to CPUS is extremely fragile
* and must be made to go through a specific and controlled
* interface (ie cci_disable_port_by_cpu(); control by general purpose
* indexing is therefore disabled for ACE ports.
*/
if (ports[port].type == ACE_PORT)
return -EPERM;
cci_port_control(port, enable);
return 0;
}
EXPORT_SYMBOL_GPL(__cci_control_port_by_index);
static const struct of_device_id arm_cci_ctrl_if_matches[] = {
{.compatible = "arm,cci-400-ctrl-if", },
{},
};
static int cci_probe_ports(struct device_node *np)
{
struct cci_nb_ports const *cci_config;
int ret, i, nb_ace = 0, nb_ace_lite = 0;
struct device_node *cp;
struct resource res;
const char *match_str;
bool is_ace;
cci_config = of_match_node(arm_cci_matches, np)->data;
if (!cci_config)
return -ENODEV;
nb_cci_ports = cci_config->nb_ace + cci_config->nb_ace_lite;
ports = kcalloc(nb_cci_ports, sizeof(*ports), GFP_KERNEL);
if (!ports)
return -ENOMEM;
for_each_child_of_node(np, cp) {
if (!of_match_node(arm_cci_ctrl_if_matches, cp))
continue;
if (!of_device_is_available(cp))
continue;
i = nb_ace + nb_ace_lite;
if (i >= nb_cci_ports)
break;
if (of_property_read_string(cp, "interface-type",
&match_str)) {
WARN(1, "node %s missing interface-type property\n",
cp->full_name);
continue;
}
is_ace = strcmp(match_str, "ace") == 0;
if (!is_ace && strcmp(match_str, "ace-lite")) {
WARN(1, "node %s containing invalid interface-type property, skipping it\n",
cp->full_name);
continue;
}
ret = of_address_to_resource(cp, 0, &res);
if (!ret) {
ports[i].base = ioremap(res.start, resource_size(&res));
ports[i].phys = res.start;
}
if (ret || !ports[i].base) {
WARN(1, "unable to ioremap CCI port %d\n", i);
continue;
}
if (is_ace) {
if (WARN_ON(nb_ace >= cci_config->nb_ace))
continue;
ports[i].type = ACE_PORT;
++nb_ace;
} else {
if (WARN_ON(nb_ace_lite >= cci_config->nb_ace_lite))
continue;
ports[i].type = ACE_LITE_PORT;
++nb_ace_lite;
}
ports[i].dn = cp;
}
/*
* If there is no CCI port that is under kernel control
* return early and report probe status.
*/
if (!nb_ace && !nb_ace_lite)
return -ENODEV;
/* initialize a stashed array of ACE ports to speed-up look-up */
cci_ace_init_ports();
/*
* Multi-cluster systems may need this data when non-coherent, during
* cluster power-up/power-down. Make sure it reaches main memory.
*/
sync_cache_w(&cci_ctrl_base);
sync_cache_w(&cci_ctrl_phys);
sync_cache_w(&ports);
sync_cache_w(&cpu_port);
__sync_cache_range_w(ports, sizeof(*ports) * nb_cci_ports);
pr_info("ARM CCI driver probed\n");
return 0;
}
#else /* !CONFIG_ARM_CCI400_PORT_CTRL */
static inline int cci_probe_ports(struct device_node *np)
{
return 0;
}
#endif /* CONFIG_ARM_CCI400_PORT_CTRL */
static int cci_probe(void)
{
int ret;
struct device_node *np;
struct resource res;
np = of_find_matching_node(NULL, arm_cci_matches);
if(!np || !of_device_is_available(np))
return -ENODEV;
ret = of_address_to_resource(np, 0, &res);
if (!ret) {
cci_ctrl_base = ioremap(res.start, resource_size(&res));
cci_ctrl_phys = res.start;
}
if (ret || !cci_ctrl_base) {
WARN(1, "unable to ioremap CCI ctrl\n");
return -ENXIO;
}
return cci_probe_ports(np);
}
static int cci_init_status = -EAGAIN;
static DEFINE_MUTEX(cci_probing);
static int cci_init(void)
{
if (cci_init_status != -EAGAIN)
return cci_init_status;
mutex_lock(&cci_probing);
if (cci_init_status == -EAGAIN)
cci_init_status = cci_probe();
mutex_unlock(&cci_probing);
return cci_init_status;
}
/*
* 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 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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