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Message-Id: <20210825161815.266051-16-alexandru.elisei@arm.com>
Date: Wed, 25 Aug 2021 17:17:51 +0100
From: Alexandru Elisei <alexandru.elisei@....com>
To: maz@...nel.org, james.morse@....com, suzuki.poulose@....com,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
will@...nel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v4 15/39] drivers/perf: Expose the cpumask of CPUs that support SPE
KVM SPE emulation will require the list of CPUs that have hardware support
for SPE. Add a function that returns the cpumask of supported CPUs
discovered by the driver during probing.
CC: Will Deacon <will@...nel.org>
Signed-off-by: Alexandru Elisei <alexandru.elisei@....com>
---
drivers/perf/arm_spe_pmu.c | 30 ++++++++++++++++++------------
include/linux/perf/arm_pmu.h | 7 +++++++
2 files changed, 25 insertions(+), 12 deletions(-)
diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
index d44bcc29d99c..40749665f102 100644
--- a/drivers/perf/arm_spe_pmu.c
+++ b/drivers/perf/arm_spe_pmu.c
@@ -50,7 +50,6 @@ struct arm_spe_pmu_buf {
struct arm_spe_pmu {
struct pmu pmu;
struct platform_device *pdev;
- cpumask_t supported_cpus;
struct hlist_node hotplug_node;
int irq; /* PPI */
@@ -72,6 +71,8 @@ struct arm_spe_pmu {
struct perf_output_handle __percpu *handle;
};
+static cpumask_t supported_cpus;
+
#define to_spe_pmu(p) (container_of(p, struct arm_spe_pmu, pmu))
/* Convert a free-running index from perf into an SPE buffer offset */
@@ -234,9 +235,7 @@ static const struct attribute_group arm_spe_pmu_format_group = {
static ssize_t cpumask_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct arm_spe_pmu *spe_pmu = dev_get_drvdata(dev);
-
- return cpumap_print_to_pagebuf(true, buf, &spe_pmu->supported_cpus);
+ return cpumap_print_to_pagebuf(true, buf, &supported_cpus);
}
static DEVICE_ATTR_RO(cpumask);
@@ -677,7 +676,7 @@ static int arm_spe_pmu_event_init(struct perf_event *event)
return -ENOENT;
if (event->cpu >= 0 &&
- !cpumask_test_cpu(event->cpu, &spe_pmu->supported_cpus))
+ !cpumask_test_cpu(event->cpu, &supported_cpus))
return -ENOENT;
if (arm_spe_event_to_pmsevfr(event) & arm_spe_pmsevfr_res0(spe_pmu->pmsver))
@@ -797,11 +796,10 @@ static void arm_spe_pmu_stop(struct perf_event *event, int flags)
static int arm_spe_pmu_add(struct perf_event *event, int flags)
{
int ret = 0;
- struct arm_spe_pmu *spe_pmu = to_spe_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
int cpu = event->cpu == -1 ? smp_processor_id() : event->cpu;
- if (!cpumask_test_cpu(cpu, &spe_pmu->supported_cpus))
+ if (!cpumask_test_cpu(cpu, &supported_cpus))
return -ENOENT;
hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
@@ -883,6 +881,13 @@ static void arm_spe_pmu_free_aux(void *aux)
kfree(buf);
}
+#if IS_BUILTIN(CONFIG_ARM_SPE_PMU)
+const cpumask_t *arm_spe_pmu_supported_cpus(void)
+{
+ return &supported_cpus;
+}
+#endif
+
/* Initialisation and teardown functions */
static int arm_spe_pmu_perf_init(struct arm_spe_pmu *spe_pmu)
{
@@ -1039,7 +1044,7 @@ static void __arm_spe_pmu_dev_probe(void *info)
dev_info(dev,
"probed for CPUs %*pbl [max_record_sz %u, align %u, features 0x%llx]\n",
- cpumask_pr_args(&spe_pmu->supported_cpus),
+ cpumask_pr_args(&supported_cpus),
spe_pmu->max_record_sz, spe_pmu->align, spe_pmu->features);
spe_pmu->features |= SPE_PMU_FEAT_DEV_PROBED;
@@ -1083,7 +1088,7 @@ static int arm_spe_pmu_cpu_startup(unsigned int cpu, struct hlist_node *node)
struct arm_spe_pmu *spe_pmu;
spe_pmu = hlist_entry_safe(node, struct arm_spe_pmu, hotplug_node);
- if (!cpumask_test_cpu(cpu, &spe_pmu->supported_cpus))
+ if (!cpumask_test_cpu(cpu, &supported_cpus))
return 0;
__arm_spe_pmu_setup_one(spe_pmu);
@@ -1095,7 +1100,7 @@ static int arm_spe_pmu_cpu_teardown(unsigned int cpu, struct hlist_node *node)
struct arm_spe_pmu *spe_pmu;
spe_pmu = hlist_entry_safe(node, struct arm_spe_pmu, hotplug_node);
- if (!cpumask_test_cpu(cpu, &spe_pmu->supported_cpus))
+ if (!cpumask_test_cpu(cpu, &supported_cpus))
return 0;
__arm_spe_pmu_stop_one(spe_pmu);
@@ -1105,7 +1110,7 @@ static int arm_spe_pmu_cpu_teardown(unsigned int cpu, struct hlist_node *node)
static int arm_spe_pmu_dev_init(struct arm_spe_pmu *spe_pmu)
{
int ret;
- cpumask_t *mask = &spe_pmu->supported_cpus;
+ cpumask_t *mask = &supported_cpus;
/* Make sure we probe the hardware on a relevant CPU */
ret = smp_call_function_any(mask, __arm_spe_pmu_dev_probe, spe_pmu, 1);
@@ -1151,7 +1156,7 @@ static int arm_spe_pmu_irq_probe(struct arm_spe_pmu *spe_pmu)
return -EINVAL;
}
- if (irq_get_percpu_devid_partition(irq, &spe_pmu->supported_cpus)) {
+ if (irq_get_percpu_devid_partition(irq, &supported_cpus)) {
dev_err(&pdev->dev, "failed to get PPI partition (%d)\n", irq);
return -EINVAL;
}
@@ -1216,6 +1221,7 @@ static int arm_spe_pmu_device_probe(struct platform_device *pdev)
arm_spe_pmu_dev_teardown(spe_pmu);
out_free_handle:
free_percpu(spe_pmu->handle);
+ cpumask_clear(&supported_cpus);
return ret;
}
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 505480217cf1..3121d95c575b 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -8,6 +8,7 @@
#ifndef __ARM_PMU_H__
#define __ARM_PMU_H__
+#include <linux/cpumask.h>
#include <linux/interrupt.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
@@ -177,4 +178,10 @@ void armpmu_free_irq(int irq, int cpu);
#define ARMV8_SPE_PDEV_NAME "arm,spe-v1"
+#if IS_BUILTIN(CONFIG_ARM_SPE_PMU)
+extern const cpumask_t *arm_spe_pmu_supported_cpus(void);
+#else
+static inline const cpumask_t *arm_spe_pmu_supported_cpus(void) { return NULL; };
+#endif
+
#endif /* __ARM_PMU_H__ */
--
2.33.0
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