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coresight: core: Add provision for panic callbacks

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Panic callback handlers allows coresight device drivers to sync
relevant trace data and trace metadata to reserved memory
regions so that they can be retrieved later in the subsequent
boot or in the crashdump kernel.

Signed-off-by: Linu Cherian <lcherian@marvell.com>
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250212114918.548431-4-lcherian@marvell.com
This commit is contained in:
Linu Cherian 2025-02-12 17:19:13 +05:30 committed by Suzuki K Poulose
parent 91a2086aa6
commit 46006ceb5d
2 changed files with 54 additions and 0 deletions
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42
drivers/hwtracing/coresight/coresight-core.c
View File

@ -19,6 +19,7 @@
#include <linux/property.h>
#include <linux/delay.h>
#include <linux/pm_runtime.h>
#include <linux/panic_notifier.h>
#include "coresight-etm-perf.h"
#include "coresight-priv.h"
@ -1453,6 +1454,36 @@ const struct bus_type coresight_bustype = {
.name = "coresight",
};
static int coresight_panic_sync(struct device *dev, void *data)
{
int mode;
struct coresight_device *csdev;
/* Run through panic sync handlers for all enabled devices */
csdev = container_of(dev, struct coresight_device, dev);
mode = coresight_get_mode(csdev);
if ((mode == CS_MODE_SYSFS) || (mode == CS_MODE_PERF)) {
if (panic_ops(csdev))
panic_ops(csdev)->sync(csdev);
}
return 0;
}
static int coresight_panic_cb(struct notifier_block *self,
unsigned long v, void *p)
{
bus_for_each_dev(&coresight_bustype, NULL, NULL,
coresight_panic_sync);
return 0;
}
static struct notifier_block coresight_notifier = {
.notifier_call = coresight_panic_cb,
};
static int __init coresight_init(void)
{
int ret;
@ -1465,11 +1496,20 @@ static int __init coresight_init(void)
if (ret)
goto exit_bus_unregister;
/* Register function to be called for panic */
ret = atomic_notifier_chain_register(&panic_notifier_list,
&coresight_notifier);
if (ret)
goto exit_perf;
/* initialise the coresight syscfg API */
ret = cscfg_init();
if (!ret)
return 0;
atomic_notifier_chain_unregister(&panic_notifier_list,
&coresight_notifier);
exit_perf:
etm_perf_exit();
exit_bus_unregister:
bus_unregister(&coresight_bustype);
@ -1479,6 +1519,8 @@ exit_bus_unregister:
static void __exit coresight_exit(void)
{
cscfg_exit();
atomic_notifier_chain_unregister(&panic_notifier_list,
&coresight_notifier);
etm_perf_exit();
bus_unregister(&coresight_bustype);
}

12
include/linux/coresight.h
View File

@ -340,6 +340,7 @@ enum cs_mode {
#define link_ops(csdev) csdev->ops->link_ops
#define helper_ops(csdev) csdev->ops->helper_ops
#define ect_ops(csdev) csdev->ops->ect_ops
#define panic_ops(csdev) csdev->ops->panic_ops
/**
* struct coresight_ops_sink - basic operations for a sink
@ -409,11 +410,22 @@ struct coresight_ops_helper {
int (*disable)(struct coresight_device *csdev, void *data);
};
/**
* struct coresight_ops_panic - Generic device ops for panic handing
*
* @sync : Sync the device register state/trace data
*/
struct coresight_ops_panic {
int (*sync)(struct coresight_device *csdev);
};
struct coresight_ops {
const struct coresight_ops_sink *sink_ops;
const struct coresight_ops_link *link_ops;
const struct coresight_ops_source *source_ops;
const struct coresight_ops_helper *helper_ops;
const struct coresight_ops_panic *panic_ops;
};
static inline u32 csdev_access_relaxed_read32(struct csdev_access *csa,