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stm class: Add source type

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Currently kernel HW tracing infrastrtucture and specifically its SyS-T
part treats all source data in the same way. Treating and encoding
different trace data sources differently might allow decoding software
to make use of e.g. ftrace event ids by converting them to a SyS-T
message catalog.

The solution is to keep source type stored within stm_source_data
structure to allow different handling by stm output/protocol.
Currently we only differentiate between STM_USER and STM_FTRACE sources.

Signed-off-by: Mikhail Lappo <miklelappo@gmail.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240429130119.1518073-3-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikhail Lappo 2024-04-29 16:01:06 +03:00 committed by Greg Kroah-Hartman
parent 3df463865b
commit 07cf835689
4 changed files with 15 additions and 0 deletions
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1
drivers/hwtracing/stm/console.c
View file

@ -22,6 +22,7 @@ static struct stm_console {
.data = {
.name = "console",
.nr_chans = 1,
.type = STM_USER,
.link = stm_console_link,
.unlink = stm_console_unlink,
},

1
drivers/hwtracing/stm/ftrace.c
View file

@ -23,6 +23,7 @@ static struct stm_ftrace {
.data = {
.name = "ftrace",
.nr_chans = STM_FTRACE_NR_CHANNELS,
.type = STM_FTRACE,
.link = stm_ftrace_link,
.unlink = stm_ftrace_unlink,
},

1
drivers/hwtracing/stm/heartbeat.c
View file

@ -78,6 +78,7 @@ static int stm_heartbeat_init(void)
}
stm_heartbeat[i].data.nr_chans = 1;
stm_heartbeat[i].data.type = STM_USER;
stm_heartbeat[i].data.link = stm_heartbeat_link;
stm_heartbeat[i].data.unlink = stm_heartbeat_unlink;
hrtimer_init(&stm_heartbeat[i].hrtimer, CLOCK_MONOTONIC,

12
include/linux/stm.h
View file

@ -30,6 +30,16 @@ enum stp_packet_flags {
STP_PACKET_TIMESTAMPED = 0x2,
};
/**
* enum stm_source_type - STM source driver
* @STM_USER: any STM trace source
* @STM_FTRACE: ftrace STM source
*/
enum stm_source_type {
STM_USER,
STM_FTRACE,
};
struct stp_policy;
struct stm_device;
@ -106,6 +116,7 @@ struct stm_source_device;
* @name: device name, will be used for policy lookup
* @src: internal structure, only used by stm class code
* @nr_chans: number of channels to allocate
* @type: type of STM source driver represented by stm_source_type
* @link: called when this source gets linked to an STM device
* @unlink: called when this source is about to get unlinked from its STM
*
@ -117,6 +128,7 @@ struct stm_source_data {
struct stm_source_device *src;
unsigned int percpu;
unsigned int nr_chans;
unsigned int type;
int (*link)(struct stm_source_data *data);
void (*unlink)(struct stm_source_data *data);
};