[PATCH 2/2] tools/gputop: toggle sysfs profiling knob if available for device

[Kamil Konieczny]

Hi Adrián,
On 2024-03-16 at 22:00:38 +0000, Adrián Larumbe wrote:
> For every DRM device that enables its job accounting HW from user space,
> toggle it right before obtaining per-client fdinfo numbers.
> 
> Make sure profiling status is returned to its original state before
> exiting, by handling the SIGINT signal just like in intel_gpu_top.
> 
> Also dynamically link gputop against igt lib instead of separate per-file
> static libraries to avoid dependence cascade because of using igt_sysfs
> functions.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe at collabora.com>
> ---
>  tools/gputop.c    | 30 +++++++++++++++++++++++++++++-
>  tools/meson.build |  2 +-
>  2 files changed, 30 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/gputop.c b/tools/gputop.c
> index 71e28f43ee4c..d6885be6aa16 100644
> --- a/tools/gputop.c
> +++ b/tools/gputop.c
> @@ -27,7 +27,9 @@
>  #include <stdbool.h>
>  
>  #include "igt_drm_clients.h"
> +#include "igt_device_scan.h"
>  #include "igt_drm_fdinfo.h"
> +#include "igt_profiling.h"
>  #include "drmtest.h"
>  
>  static const char *bars[] = { " ", "▏", "▎", "▍", "▌", "▋", "▊", "▉", "█" };
> @@ -243,9 +245,17 @@ static int client_cmp(const void *_a, const void *_b, void *unused)
>  
>  }
>  
> +static bool stop_top;
--------- ^^^^^^
Add 'volatile' here as compiler could optimise your loop into
while(true).

> +
> +static void sigint_handler(int  sig)
> +{
> +	stop_top = true;
> +}
> +
>  int main(int argc, char **argv)
>  {
>  	unsigned int period_us = 2e6;
> +	struct igt_profiled_device *profiled_devices = NULL;
>  	struct igt_drm_clients *clients = NULL;
>  	int con_w = -1, con_h = -1;
>  
> @@ -253,9 +263,22 @@ int main(int argc, char **argv)
>  	if (!clients)
>  		exit(1);
>  
> +	igt_devices_scan(false);
> +
> +	profiled_devices = igt_devices_profiled();
> +	if (profiled_devices != NULL)
> +		igt_devices_toggle_profiling(profiled_devices, true);
> +
> +	if (signal(SIGINT, sigint_handler) == SIG_ERR) {
> +		fprintf(stderr, "Failed to install signal handler!\n");
> +		igt_devices_toggle_profiling(profiled_devices, false);
> +		free(profiled_devices);
> +		profiled_devices = NULL;
> +	}
> +
>  	igt_drm_clients_scan(clients, NULL, NULL, 0, NULL, 0);
>  
> -	for (;;) {
> +	while (!stop_top) {
>  		struct igt_drm_client *c, *prevc = NULL;
>  		int i, engine_w = 0, lines = 0;
>  		struct winsize ws;
> @@ -293,5 +316,10 @@ int main(int argc, char **argv)
>  		usleep(period_us);
>  	}
>  
> +	if (profiled_devices != NULL) {
> +		igt_devices_toggle_profiling(profiled_devices, false);
> +		free(profiled_devices);
> +	}
> +
>  	return 0;
>  }
> diff --git a/tools/meson.build b/tools/meson.build
> index ac79d8b5840c..a126d6cad7ba 100644
> --- a/tools/meson.build
> +++ b/tools/meson.build
> @@ -68,7 +68,7 @@ endif
>  executable('gputop', 'gputop.c',
>             install : true,
>             install_rpath : bindir_rpathdir,
> -           dependencies : [lib_igt_drm_clients,lib_igt_drm_fdinfo,math])
------------------------------------------------- ^^^^^^^^^^^^^^^^^^
> +           dependencies : [lib_igt, lib_igt_drm_clients, math])
----------------------------- ^^^^^^^
This will blow-up size of tool, also why did you removed
lib_igt_drm_fdinfo?

Regards,
Kamil

>  
>  intel_l3_parity_src = [ 'intel_l3_parity.c', 'intel_l3_udev_listener.c' ]
>  executable('intel_l3_parity', sources : intel_l3_parity_src,
> -- 
> 2.43.0
>