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soc: qcom: Add snapshot of Core Hang Detection driver
This is a snapshot of the Core Hang Detection driver as of
commit <908a517b050d> ("Merge "sched/walt: remove duplicate
definitions of rt_task_arrival_time"").
Change-Id: Ic1d9b61b3488e88e08eb317f0e406a350dd73310
Signed-off-by: Huang Yiwei <quic_hyiwei@quicinc.com>
This commit is contained in:
Huang Yiwei
parent
5b4abda897
commit
cf88b9b75e
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@ -107,6 +107,14 @@ config QCOM_RMTFS_MEM
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Say y here if you intend to boot the modem remoteproc.
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config MSM_CORE_HANG_DETECT
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tristate "MSM Core Hang Detection Support"
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help
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This enables the core hang detection module. It causes SoC
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reset on core hang detection and collects the core context
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for hang. By using sysfs entries core hang detection can be
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enabled or disabled dynamically.
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config QCOM_RPMH
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tristate "Qualcomm RPM-Hardened (RPMH) Communication"
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depends on ARCH_QCOM || COMPILE_TEST
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@ -30,3 +30,4 @@ obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o
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obj-$(CONFIG_QCOM_KRYO_L2_ACCESSORS) += kryo-l2-accessors.o
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obj-$(CONFIG_MSM_BOOT_STATS) += boot_stats.o
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obj-$(CONFIG_QCOM_RUN_QUEUE_STATS) += rq_stats.o
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obj-$(CONFIG_MSM_CORE_HANG_DETECT) += core_hang_detect.o
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388
drivers/soc/qcom/core_hang_detect.c
Normal file
388
drivers/soc/qcom/core_hang_detect.c
Normal file
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@ -0,0 +1,388 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015-2016, 2018, 2021 The Linux Foundation. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/cpu.h>
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include <linux/slab.h>
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#include <linux/qcom_scm.h>
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#include <linux/platform_device.h>
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/* pmu event max value */
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#define PMU_EVENT_MAX 0x1F
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#define PMU_MUX_OFFSET 4
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#define PMU_MUX_MASK_BITS 0xF
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#define ENABLE_OFFSET 1
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#define ENABLE_MASK_BITS 0x1
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#define _VAL(z) (z##_MASK_BITS << z##_OFFSET)
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#define _VALUE(_val, z) (_val<<(z##_OFFSET))
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#define _WRITE(x, y, z) (((~(_VAL(z))) & y) | _VALUE(x, z))
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#define _GET_BITS(_val, z) ((_val>>(z##_OFFSET)) & z##_MASK_BITS)
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#define MODULE_NAME "msm_hang_detect"
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#define MAX_SYSFS_LEN 12
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struct hang_detect {
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phys_addr_t threshold[NR_CPUS];
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phys_addr_t config[NR_CPUS];
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uint32_t pmu_event_sel;
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struct kobject kobj;
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};
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/* interface for exporting attributes */
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struct core_hang_attribute {
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struct attribute attr;
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ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
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char *buf);
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size_t (*store)(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count);
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};
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#define CORE_HANG_ATTR(_name, _mode, _show, _store) \
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struct core_hang_attribute hang_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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#define to_core_hang_dev(kobj) \
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container_of(kobj, struct hang_detect, kobj)
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#define to_core_attr(_attr) \
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container_of(_attr, struct core_hang_attribute, attr)
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/*
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* On the kernel command line specify core_hang_detect.enable=1
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* to enable the core hang detect module.
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* By default core hang detect is turned on
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*/
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static int enable = 1;
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module_param(enable, int, 0444);
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static ssize_t attr_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct core_hang_attribute *core_attr = to_core_attr(attr);
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ssize_t ret = -EIO;
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if (core_attr->show)
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ret = core_attr->show(kobj, attr, buf);
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return ret;
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}
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static ssize_t attr_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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struct core_hang_attribute *core_attr = to_core_attr(attr);
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ssize_t ret = -EIO;
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if (core_attr->store)
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ret = core_attr->store(kobj, attr, buf, count);
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return ret;
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}
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static const struct sysfs_ops core_sysfs_ops = {
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.show = attr_show,
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.store = attr_store,
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};
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static struct kobj_type core_ktype = {
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.sysfs_ops = &core_sysfs_ops,
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};
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static ssize_t show_threshold(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct hang_detect *device = to_core_hang_dev(kobj);
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u32 threshold_val;
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if (qcom_scm_io_readl(device->threshold[0], &threshold_val)) {
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pr_err("%s: Failed to get threshold for core0\n", __func__);
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return -EIO;
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}
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return scnprintf(buf, MAX_SYSFS_LEN, "0x%x\n", threshold_val);
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}
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static size_t store_threshold(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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struct hang_detect *hang_dev = to_core_hang_dev(kobj);
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uint32_t threshold_val;
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int ret, cpu;
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ret = kstrtouint(buf, 0, &threshold_val);
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if (ret < 0)
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return ret;
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if (threshold_val == 0)
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return -EINVAL;
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for_each_possible_cpu(cpu) {
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if (!hang_dev->threshold[cpu])
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continue;
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if (qcom_scm_io_writel(hang_dev->threshold[cpu],
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threshold_val)) {
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pr_err("%s: Failed to set threshold for core%d\n",
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__func__, cpu);
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return -EIO;
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}
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}
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return count;
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}
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CORE_HANG_ATTR(threshold, 0644, show_threshold, store_threshold);
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static ssize_t show_pmu_event_sel(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct hang_detect *hang_device = to_core_hang_dev(kobj);
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return scnprintf(buf, MAX_SYSFS_LEN, "0x%x\n",
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hang_device->pmu_event_sel);
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}
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static size_t store_pmu_event_sel(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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int cpu, ret;
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uint32_t pmu_event_sel, reg_value;
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struct hang_detect *hang_dev = to_core_hang_dev(kobj);
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ret = kstrtouint(buf, 0, &pmu_event_sel);
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if (ret < 0)
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return ret;
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if (pmu_event_sel > PMU_EVENT_MAX)
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return -EINVAL;
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for_each_possible_cpu(cpu) {
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if (!hang_dev->config[cpu])
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continue;
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if (qcom_scm_io_readl(hang_dev->config[cpu], ®_value)) {
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pr_err("%s: Failed to get pmu config for core%d\n",
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__func__, cpu);
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return -EIO;
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}
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if (qcom_scm_io_writel(hang_dev->config[cpu],
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_WRITE(pmu_event_sel, reg_value, PMU_MUX))) {
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pr_err("%s: Failed to set pmu event for core%d\n",
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__func__, cpu);
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return -EIO;
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}
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}
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hang_dev->pmu_event_sel = pmu_event_sel;
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return count;
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}
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CORE_HANG_ATTR(pmu_event_sel, 0644, show_pmu_event_sel, store_pmu_event_sel);
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static ssize_t show_enable(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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u32 enabled;
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struct hang_detect *hang_dev = to_core_hang_dev(kobj);
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if (qcom_scm_io_readl(hang_dev->config[0], &enabled)) {
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pr_err("%s: Failed to get pmu config for core0\n", __func__);
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return -EIO;
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}
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enabled = _GET_BITS(enabled, ENABLE);
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return scnprintf(buf, MAX_SYSFS_LEN, "%u\n", enabled);
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}
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static size_t store_enable(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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struct hang_detect *hang_dev = to_core_hang_dev(kobj);
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uint32_t reg_value;
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int cpu, ret;
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bool enabled;
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ret = kstrtobool(buf, &enabled);
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if (ret < 0)
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return -EINVAL;
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for_each_possible_cpu(cpu) {
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if (!hang_dev->config[cpu])
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continue;
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if (qcom_scm_io_readl(hang_dev->config[cpu], ®_value)) {
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pr_err("%s: Failed to get pmu event for core%d\n",
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__func__, cpu);
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return -EIO;
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}
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if (qcom_scm_io_writel(hang_dev->config[cpu],
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_WRITE(enabled, reg_value, ENABLE))) {
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pr_err("%s: Failed to set enable for core%d\n",
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__func__, cpu);
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return -EIO;
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}
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}
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return count;
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}
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CORE_HANG_ATTR(enable, 0644, show_enable, store_enable);
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static struct attribute *hang_attrs[] = {
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&hang_attr_threshold.attr,
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&hang_attr_pmu_event_sel.attr,
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&hang_attr_enable.attr,
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NULL
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};
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static struct attribute_group hang_attr_group = {
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.attrs = hang_attrs,
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};
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static const struct of_device_id msm_hang_detect_table[] = {
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{ .compatible = "qcom,core-hang-detect" },
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{},
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};
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static int msm_hang_detect_probe(struct platform_device *pdev)
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{
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struct device_node *cpu_node;
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struct device_node *node = pdev->dev.of_node;
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struct hang_detect *hang_det = NULL;
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int cpu, ret, cpu_count = 0, num_regs = 0;
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const char *name;
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u32 *treg, *creg;
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if (!pdev->dev.of_node || !enable)
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return -ENODEV;
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hang_det = devm_kzalloc(&pdev->dev,
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sizeof(struct hang_detect), GFP_KERNEL);
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if (!hang_det)
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return -ENOMEM;
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name = of_get_property(node, "label", NULL);
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if (!name) {
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pr_err("%s: Can't get label property\n", __func__);
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return -EINVAL;
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}
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num_regs = of_property_count_u32_elems(node, "qcom,threshold-arr");
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if (num_regs < 0) {
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pr_err("%s: Can't get qcom,threshold-arr property\n", __func__);
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return -EINVAL;
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}
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if (num_regs > num_possible_cpus()) {
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pr_err("%s: expected <= %d elements in qcom,threshold-arr\n",
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__func__, num_possible_cpus());
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return -EINVAL;
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}
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ret = of_property_count_u32_elems(node, "qcom,config-arr");
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if (ret < 0) {
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pr_err("%s: Can't get qcom,config-arr property\n", __func__);
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return -EINVAL;
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}
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if (ret != num_regs) {
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pr_err("%s: expected %d elements in qcom,config-arr\n",
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__func__, num_regs);
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return -EINVAL;
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}
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treg = kzalloc(sizeof(*treg) * num_regs, GFP_KERNEL);
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if (!treg)
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return -ENOMEM;
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ret = of_property_read_u32_array(node, "qcom,threshold-arr",
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treg, num_regs);
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if (ret) {
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pr_err("%s: Can't get qcom,threshold-arr property\n", __func__);
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kfree(treg);
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return -EINVAL;
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}
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creg = kzalloc(sizeof(*creg) * num_regs, GFP_KERNEL);
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if (!creg) {
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kfree(treg);
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return -ENOMEM;
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}
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ret = of_property_read_u32_array(node, "qcom,config-arr",
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creg, num_regs);
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if (ret) {
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pr_err("%s: Can't get qcom,config-arr property\n", __func__);
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kfree(treg);
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kfree(creg);
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return -EINVAL;
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}
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for_each_possible_cpu(cpu) {
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cpu_node = of_get_cpu_node(cpu, NULL);
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if (cpu_node != NULL) {
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hang_det->threshold[cpu] = treg[cpu];
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hang_det->config[cpu] = creg[cpu];
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cpu_count++;
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}
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}
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kfree(treg);
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kfree(creg);
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if (cpu_count == 0) {
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pr_err("%s: Unable to find any CPU\n", __func__);
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return -EINVAL;
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}
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ret = kobject_init_and_add(&hang_det->kobj, &core_ktype,
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&cpu_subsys.dev_root->kobj, "%s_%s",
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"hang_detect", name);
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if (ret) {
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pr_err("%s: Error in creation kobject_add\n", __func__);
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goto out_put_kobj;
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}
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ret = sysfs_create_group(&hang_det->kobj, &hang_attr_group);
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if (ret) {
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pr_err("%s: Error in creation sysfs_create_group\n", __func__);
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goto out_del_kobj;
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}
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platform_set_drvdata(pdev, hang_det);
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return 0;
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out_del_kobj:
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kobject_del(&hang_det->kobj);
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out_put_kobj:
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kobject_put(&hang_det->kobj);
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return ret;
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}
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static int msm_hang_detect_remove(struct platform_device *pdev)
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{
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struct hang_detect *hang_det = platform_get_drvdata(pdev);
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platform_set_drvdata(pdev, NULL);
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sysfs_remove_group(&hang_det->kobj, &hang_attr_group);
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kobject_del(&hang_det->kobj);
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kobject_put(&hang_det->kobj);
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return 0;
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}
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static struct platform_driver msm_hang_detect_driver = {
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.probe = msm_hang_detect_probe,
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.remove = msm_hang_detect_remove,
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.driver = {
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.name = MODULE_NAME,
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.of_match_table = msm_hang_detect_table,
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},
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};
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module_platform_driver(msm_hang_detect_driver);
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MODULE_DESCRIPTION("MSM Core Hang Detect Driver");
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MODULE_LICENSE("GPL v2");
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