linux/drivers/perf/arm_pmu_platform.c
Rob Herring 918dc87b74 drivers/perf: Explicitly include correct DT includes
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230714174832.4061752-1-robh@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
2023-07-27 13:02:23 +01:00

245 lines
5.4 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* platform_device probing code for ARM performance counters.
*
* Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
* Copyright (C) 2010 ARM Ltd., Will Deacon <will.deacon@arm.com>
*/
#define pr_fmt(fmt) "hw perfevents: " fmt
#define dev_fmt pr_fmt
#include <linux/bug.h>
#include <linux/cpumask.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/kconfig.h>
#include <linux/of.h>
#include <linux/percpu.h>
#include <linux/perf/arm_pmu.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/smp.h>
static int probe_current_pmu(struct arm_pmu *pmu,
const struct pmu_probe_info *info)
{
int cpu = get_cpu();
unsigned int cpuid = read_cpuid_id();
int ret = -ENODEV;
pr_info("probing PMU on CPU %d\n", cpu);
for (; info->init != NULL; info++) {
if ((cpuid & info->mask) != info->cpuid)
continue;
ret = info->init(pmu);
break;
}
put_cpu();
return ret;
}
static int pmu_parse_percpu_irq(struct arm_pmu *pmu, int irq)
{
int cpu, ret;
struct pmu_hw_events __percpu *hw_events = pmu->hw_events;
ret = irq_get_percpu_devid_partition(irq, &pmu->supported_cpus);
if (ret)
return ret;
for_each_cpu(cpu, &pmu->supported_cpus)
per_cpu(hw_events->irq, cpu) = irq;
return 0;
}
static bool pmu_has_irq_affinity(struct device_node *node)
{
return !!of_find_property(node, "interrupt-affinity", NULL);
}
static int pmu_parse_irq_affinity(struct device *dev, int i)
{
struct device_node *dn;
int cpu;
/*
* If we don't have an interrupt-affinity property, we guess irq
* affinity matches our logical CPU order, as we used to assume.
* This is fragile, so we'll warn in pmu_parse_irqs().
*/
if (!pmu_has_irq_affinity(dev->of_node))
return i;
dn = of_parse_phandle(dev->of_node, "interrupt-affinity", i);
if (!dn) {
dev_warn(dev, "failed to parse interrupt-affinity[%d]\n", i);
return -EINVAL;
}
cpu = of_cpu_node_to_id(dn);
if (cpu < 0) {
dev_warn(dev, "failed to find logical CPU for %pOFn\n", dn);
cpu = nr_cpu_ids;
}
of_node_put(dn);
return cpu;
}
static int pmu_parse_irqs(struct arm_pmu *pmu)
{
int i = 0, num_irqs;
struct platform_device *pdev = pmu->plat_device;
struct pmu_hw_events __percpu *hw_events = pmu->hw_events;
struct device *dev = &pdev->dev;
num_irqs = platform_irq_count(pdev);
if (num_irqs < 0)
return dev_err_probe(dev, num_irqs, "unable to count PMU IRQs\n");
/*
* In this case we have no idea which CPUs are covered by the PMU.
* To match our prior behaviour, we assume all CPUs in this case.
*/
if (num_irqs == 0) {
dev_warn(dev, "no irqs for PMU, sampling events not supported\n");
pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
cpumask_setall(&pmu->supported_cpus);
return 0;
}
if (num_irqs == 1) {
int irq = platform_get_irq(pdev, 0);
if ((irq > 0) && irq_is_percpu_devid(irq))
return pmu_parse_percpu_irq(pmu, irq);
}
if (nr_cpu_ids != 1 && !pmu_has_irq_affinity(dev->of_node))
dev_warn(dev, "no interrupt-affinity property, guessing.\n");
for (i = 0; i < num_irqs; i++) {
int cpu, irq;
irq = platform_get_irq(pdev, i);
if (WARN_ON(irq <= 0))
continue;
if (irq_is_percpu_devid(irq)) {
dev_warn(dev, "multiple PPIs or mismatched SPI/PPI detected\n");
return -EINVAL;
}
cpu = pmu_parse_irq_affinity(dev, i);
if (cpu < 0)
return cpu;
if (cpu >= nr_cpu_ids)
continue;
if (per_cpu(hw_events->irq, cpu)) {
dev_warn(dev, "multiple PMU IRQs for the same CPU detected\n");
return -EINVAL;
}
per_cpu(hw_events->irq, cpu) = irq;
cpumask_set_cpu(cpu, &pmu->supported_cpus);
}
return 0;
}
static int armpmu_request_irqs(struct arm_pmu *armpmu)
{
struct pmu_hw_events __percpu *hw_events = armpmu->hw_events;
int cpu, err = 0;
for_each_cpu(cpu, &armpmu->supported_cpus) {
int irq = per_cpu(hw_events->irq, cpu);
if (!irq)
continue;
err = armpmu_request_irq(irq, cpu);
if (err)
break;
}
return err;
}
static void armpmu_free_irqs(struct arm_pmu *armpmu)
{
int cpu;
struct pmu_hw_events __percpu *hw_events = armpmu->hw_events;
for_each_cpu(cpu, &armpmu->supported_cpus) {
int irq = per_cpu(hw_events->irq, cpu);
armpmu_free_irq(irq, cpu);
}
}
int arm_pmu_device_probe(struct platform_device *pdev,
const struct of_device_id *of_table,
const struct pmu_probe_info *probe_table)
{
armpmu_init_fn init_fn;
struct device *dev = &pdev->dev;
struct arm_pmu *pmu;
int ret = -ENODEV;
pmu = armpmu_alloc();
if (!pmu)
return -ENOMEM;
pmu->plat_device = pdev;
ret = pmu_parse_irqs(pmu);
if (ret)
goto out_free;
init_fn = of_device_get_match_data(dev);
if (init_fn) {
pmu->secure_access = of_property_read_bool(dev->of_node,
"secure-reg-access");
/* arm64 systems boot only as non-secure */
if (IS_ENABLED(CONFIG_ARM64) && pmu->secure_access) {
dev_warn(dev, "ignoring \"secure-reg-access\" property for arm64\n");
pmu->secure_access = false;
}
ret = init_fn(pmu);
} else if (probe_table) {
cpumask_setall(&pmu->supported_cpus);
ret = probe_current_pmu(pmu, probe_table);
}
if (ret) {
dev_err(dev, "failed to probe PMU!\n");
goto out_free;
}
ret = armpmu_request_irqs(pmu);
if (ret)
goto out_free_irqs;
ret = armpmu_register(pmu);
if (ret) {
dev_err(dev, "failed to register PMU devices!\n");
goto out_free_irqs;
}
return 0;
out_free_irqs:
armpmu_free_irqs(pmu);
out_free:
armpmu_free(pmu);
return ret;
}