soc: qcom: Introduce RPM master stats driver

Introduce a driver to query and expose detailed, per-subsystem (as opposed
to the existing qcom_stats driver which exposes SoC-wide data) about low
power mode states of a given RPM master. That includes the APSS (ARM),
MPSS (modem) and other remote cores, depending on the platform
configuration.

This is a vastly cleaned up and restructured version of a similar
driver found in msm-5.4.

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230405-topic-master_stats-v6-2-2277b4433748@linaro.org
This commit is contained in:
Konrad Dybcio 2023-04-20 19:36:18 +02:00 коммит произвёл Bjorn Andersson
Родитель 0be4392435
Коммит a77b2a0b12
3 изменённых файлов: 175 добавлений и 0 удалений

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@ -135,6 +135,17 @@ config QCOM_RMTFS_MEM
Say y here if you intend to boot the modem remoteproc.
config QCOM_RPM_MASTER_STATS
tristate "Qualcomm RPM Master stats"
depends on ARCH_QCOM || COMPILE_TEST
help
The RPM Master sleep stats driver provides detailed per-subsystem
sleep/wake data, read from the RPM message RAM. It can be used to
assess whether all the low-power modes available are entered as
expected or to check which part of the SoC prevents it from sleeping.
Say y here if you intend to debug or monitor platform sleep.
config QCOM_RPMH
tristate "Qualcomm RPM-Hardened (RPMH) Communication"
depends on ARCH_QCOM || COMPILE_TEST

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@ -14,6 +14,7 @@ obj-$(CONFIG_QCOM_QMI_HELPERS) += qmi_helpers.o
qmi_helpers-y += qmi_encdec.o qmi_interface.o
obj-$(CONFIG_QCOM_RAMP_CTRL) += ramp_controller.o
obj-$(CONFIG_QCOM_RMTFS_MEM) += rmtfs_mem.o
obj-$(CONFIG_QCOM_RPM_MASTER_STATS) += rpm_master_stats.o
obj-$(CONFIG_QCOM_RPMH) += qcom_rpmh.o
qcom_rpmh-y += rpmh-rsc.o
qcom_rpmh-y += rpmh.o

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@ -0,0 +1,163 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2023, Linaro Limited
*
* This driver supports what is known as "Master Stats v2" in Qualcomm
* downstream kernel terms, which seems to be the only version which has
* ever shipped, all the way from 2013 to 2023.
*/
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
struct master_stats_data {
void __iomem *base;
const char *label;
};
struct rpm_master_stats {
u32 active_cores;
u32 num_shutdowns;
u64 shutdown_req;
u64 wakeup_idx;
u64 bringup_req;
u64 bringup_ack;
u32 wakeup_reason; /* 0 = "rude wakeup", 1 = scheduled wakeup */
u32 last_sleep_trans_dur;
u32 last_wake_trans_dur;
/* Per-subsystem (*not necessarily* SoC-wide) XO shutdown stats */
u32 xo_count;
u64 xo_last_enter;
u64 last_exit;
u64 xo_total_dur;
} __packed;
static int master_stats_show(struct seq_file *s, void *unused)
{
struct master_stats_data *data = s->private;
struct rpm_master_stats stat;
memcpy_fromio(&stat, data->base, sizeof(stat));
seq_printf(s, "%s:\n", data->label);
seq_printf(s, "\tLast shutdown @ %llu\n", stat.shutdown_req);
seq_printf(s, "\tLast bringup req @ %llu\n", stat.bringup_req);
seq_printf(s, "\tLast bringup ack @ %llu\n", stat.bringup_ack);
seq_printf(s, "\tLast wakeup idx: %llu\n", stat.wakeup_idx);
seq_printf(s, "\tLast XO shutdown enter @ %llu\n", stat.xo_last_enter);
seq_printf(s, "\tLast XO shutdown exit @ %llu\n", stat.last_exit);
seq_printf(s, "\tXO total duration: %llu\n", stat.xo_total_dur);
seq_printf(s, "\tLast sleep transition duration: %u\n", stat.last_sleep_trans_dur);
seq_printf(s, "\tLast wake transition duration: %u\n", stat.last_wake_trans_dur);
seq_printf(s, "\tXO shutdown count: %u\n", stat.xo_count);
seq_printf(s, "\tWakeup reason: 0x%x\n", stat.wakeup_reason);
seq_printf(s, "\tShutdown count: %u\n", stat.num_shutdowns);
seq_printf(s, "\tActive cores bitmask: 0x%x\n", stat.active_cores);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(master_stats);
static int master_stats_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct master_stats_data *data;
struct device_node *msgram_np;
struct dentry *dent, *root;
struct resource res;
int count, i, ret;
count = of_property_count_strings(dev->of_node, "qcom,master-names");
if (count < 0)
return count;
data = devm_kzalloc(dev, count * sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
root = debugfs_create_dir("qcom_rpm_master_stats", NULL);
platform_set_drvdata(pdev, root);
for (i = 0; i < count; i++) {
msgram_np = of_parse_phandle(dev->of_node, "qcom,rpm-msg-ram", i);
if (!msgram_np) {
debugfs_remove_recursive(root);
return dev_err_probe(dev, -ENODEV,
"Couldn't parse MSG RAM phandle idx %d", i);
}
/*
* Purposefully skip devm_platform helpers as we're using a
* shared resource.
*/
ret = of_address_to_resource(msgram_np, 0, &res);
of_node_put(msgram_np);
if (ret < 0) {
debugfs_remove_recursive(root);
return ret;
}
data[i].base = devm_ioremap(dev, res.start, resource_size(&res));
if (IS_ERR(data[i].base)) {
debugfs_remove_recursive(root);
return dev_err_probe(dev, -EINVAL,
"Could not map the MSG RAM slice idx %d!\n", i);
}
ret = of_property_read_string_index(dev->of_node, "qcom,master-names", i,
&data[i].label);
if (ret < 0) {
debugfs_remove_recursive(root);
return dev_err_probe(dev, ret,
"Could not read name idx %d!\n", i);
}
/*
* Generally it's not advised to fail on debugfs errors, but this
* driver's only job is exposing data therein.
*/
dent = debugfs_create_file(data[i].label, 0444, root,
&data[i], &master_stats_fops);
if (IS_ERR(dent)) {
debugfs_remove_recursive(root);
return dev_err_probe(dev, PTR_ERR(dent),
"Failed to create debugfs file %s!\n", data[i].label);
}
}
device_set_pm_not_required(dev);
return 0;
}
static void master_stats_remove(struct platform_device *pdev)
{
struct dentry *root = platform_get_drvdata(pdev);
debugfs_remove_recursive(root);
}
static const struct of_device_id rpm_master_table[] = {
{ .compatible = "qcom,rpm-master-stats" },
{ },
};
static struct platform_driver master_stats_driver = {
.probe = master_stats_probe,
.remove_new = master_stats_remove,
.driver = {
.name = "qcom_rpm_master_stats",
.of_match_table = rpm_master_table,
},
};
module_platform_driver(master_stats_driver);
MODULE_DESCRIPTION("Qualcomm RPM Master Statistics driver");
MODULE_LICENSE("GPL");