Re: [RFC 1/3] intel_gpu_top: User friendly device listing

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On Mon, Nov 09, 2020 at 10:48:09AM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> 
> Adding a new device selection print type suitable for user-facing
> use cases like intel_gpu_top -L and later lsgpu.
> 
> Instead of:
> 
> sys:/sys/devices/pci0000:00/0000:00:02.0/drm/card0
>     subsystem       : drm
>     drm card        : /dev/dri/card0
>     parent          : sys:/sys/devices/pci0000:00/0000:00:02.0
> 
> sys:/sys/devices/pci0000:00/0000:00:02.0/drm/renderD128
>     subsystem       : drm
>     drm render      : /dev/dri/renderD128
>     parent          : sys:/sys/devices/pci0000:00/0000:00:02.0
> 
> sys:/sys/devices/pci0000:00/0000:00:02.0
>     subsystem       : pci
>     drm card        : /dev/dri/card0
>     drm render      : /dev/dri/renderD128
>     vendor          : 8086
>     device          : 193B
> 
> New format looks like:
> 
> card0                   8086:193B    drm:/dev/dri/card0
> └─renderD128                         drm:/dev/dri/renderD128
> 
> Advantages are more compact, more readable, one entry per GPU, shorter
> string to copy and paste to intel_gpu_top -d, or respective usage.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Cc: Petri Latvala <petri.latvala@xxxxxxxxx>
> Cc: Zbigniew Kempczyński <zbigniew.kempczynski@xxxxxxxxx>
> ---
>  lib/igt_device_scan.c | 109 +++++++++++++++++++++++++++++++++++++-----
>  lib/igt_device_scan.h |   1 +
>  tools/intel_gpu_top.c |   3 +-
>  3 files changed, 100 insertions(+), 13 deletions(-)
> 
> diff --git a/lib/igt_device_scan.c b/lib/igt_device_scan.c
> index c581a31ae55e..e66ccdc25aeb 100644
> --- a/lib/igt_device_scan.c
> +++ b/lib/igt_device_scan.c
> @@ -735,18 +735,26 @@ static inline void _pr_simple2(const char *k, const char *v1, const char *v2)
>  	printf("    %-16s: %s:%s\n", k, v1, v2);
>  }
>  
> -static void igt_devs_print_simple(struct igt_list_head *view)
> +static bool __check_empty(struct igt_list_head *view)
>  {
> -	struct igt_device *dev;
> -
>  	if (!view)
> -		return;
> +		return true;
>  
>  	if (igt_list_empty(view)) {
>  		printf("No GPU devices found\n");
> -		return;
> +		return true;
>  	}
>  
> +	return false;
> +}
> +
> +static void igt_devs_print_simple(struct igt_list_head *view)
> +{
> +	struct igt_device *dev;
> +
> +	if (__check_empty(view))
> +		return;
> +
>  	igt_list_for_each_entry(dev, view, link) {
>  		printf("sys:%s\n", dev->syspath);
>  		if (dev->subsystem)
> @@ -768,6 +776,89 @@ static void igt_devs_print_simple(struct igt_list_head *view)
>  	}
>  }
>  
> +static struct igt_device *
> +__find_pci(struct igt_list_head *view, const char *drm)
> +{
> +	struct igt_device *dev;
> +
> +	igt_list_for_each_entry(dev, view, link) {
> +		if (!is_pci_subsystem(dev) || !dev->drm_card)
> +			continue;
> +
> +		if (!strcmp(dev->drm_card, drm))
> +			return dev;
> +	}
> +
> +	return NULL;
> +}
> +
> +static void igt_devs_print_user(struct igt_list_head *view)
> +{
> +	struct igt_device *dev;
> +
> +	if (__check_empty(view))
> +		return;
> +
> +	igt_list_for_each_entry(dev, view, link) {
> +		unsigned int i, num_children;
> +		struct igt_device *pci_dev;
> +		struct igt_device *dev2;
> +		char filter[64];
> +		char *drm_name;
> +		int ret;
> +
> +		if (!is_drm_subsystem(dev))
> +			continue;
> +		if (!dev->drm_card || dev->drm_render)
> +			continue;
> +
> +		drm_name = rindex(dev->drm_card, '/');
> +		if (!drm_name || !*++drm_name)
> +			continue;
> +
> +		ret = snprintf(filter, sizeof(filter), "drm:%s", dev->drm_card);
> +		igt_assert(ret < sizeof(filter));
> +
> +		pci_dev = __find_pci(view, dev->drm_card);
> +		if (pci_dev)
> +			printf("%-24s%4s:%4s    %s\n",
> +			       drm_name, pci_dev->vendor, pci_dev->device,
> +			       filter);
> +		else
> +			printf("%-24s             %s\n", drm_name, filter);
> +
> +		num_children = 0;
> +		igt_list_for_each_entry(dev2, view, link) {
> +			if (!is_drm_subsystem(dev2) || !dev2->drm_render)
> +				continue;
> +			if (strcmp(dev2->parent->syspath, dev->parent->syspath))
> +				continue;
> +
> +			num_children++;
> +		}
> +
> +		i = 0;
> +		igt_list_for_each_entry(dev2, view, link) {
> +			if (!is_drm_subsystem(dev2) || !dev2->drm_render)
> +				continue;
> +			if (strcmp(dev2->parent->syspath, dev->parent->syspath))
> +				continue;
> +
> +			drm_name = rindex(dev2->drm_render, '/');
> +			if (!drm_name || !*++drm_name)
> +				continue;
> +
> +			ret = snprintf(filter, sizeof(filter), "drm:%s",
> +				       dev2->drm_render);
> +			igt_assert(ret < sizeof(filter));
> +
> +			printf("%s%-22s             %s\n",
> +			       (++i == num_children) ? "└─" : "├─",
> +			       drm_name, filter);
> +		}
> +	}
> +}
> +
>  static inline void _print_key_value(const char* k, const char *v)
>  {
>  	printf("%-32s: %s\n", k, v);
> @@ -792,14 +883,9 @@ static void igt_devs_print_detail(struct igt_list_head *view)
>  {
>  	struct igt_device *dev;
>  
> -	if (!view)
> +	if (__check_empty(view))
>  		return;
>  
> -	if (igt_list_empty(view)) {
> -		printf("No GPU devices found\n");
> -		return;
> -	}
> -
>  	igt_list_for_each_entry(dev, view, link) {
>  		printf("========== %s:%s ==========\n",
>  		       dev->subsystem, dev->syspath);
> @@ -821,6 +907,7 @@ static struct print_func {
>  } print_functions[] = {
>  	[IGT_PRINT_SIMPLE] = { .prn = igt_devs_print_simple },
>  	[IGT_PRINT_DETAIL] = { .prn = igt_devs_print_detail },
> +	[IGT_PRINT_USER] = { .prn = igt_devs_print_user },
>  };
>  
>  /**
> diff --git a/lib/igt_device_scan.h b/lib/igt_device_scan.h
> index 99daee0c52d6..9822c22cb69c 100644
> --- a/lib/igt_device_scan.h
> +++ b/lib/igt_device_scan.h
> @@ -37,6 +37,7 @@
>  enum igt_devices_print_type {
>  	IGT_PRINT_SIMPLE,
>  	IGT_PRINT_DETAIL,
> +	IGT_PRINT_USER, /* End user friendly. */
>  };
>  
>  #define INTEGRATED_I915_GPU_PCI_ID "0000:00:02.0"
> diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
> index 298defa4e6ed..5230472d2af4 100644
> --- a/tools/intel_gpu_top.c
> +++ b/tools/intel_gpu_top.c
> @@ -1313,7 +1313,6 @@ int main(int argc, char **argv)
>  	unsigned int i;
>  	int ret = 0, ch;
>  	bool list_device = false;
> -	enum igt_devices_print_type printtype = IGT_PRINT_SIMPLE;
>  	char *pmu_device, *opt_device = NULL;
>  	struct igt_device_card card;
>  
> @@ -1388,7 +1387,7 @@ int main(int argc, char **argv)
>  	igt_devices_scan(false);
>  
>  	if (list_device) {
> -		igt_devices_print(printtype);
> +		igt_devices_print(IGT_PRINT_USER);

I would add at least possibility to use simple view to suggest 
how to use pci/sys filter. With USER print format we see only
drm paths. But I won't insist for that, using drm selection
is ok for me. 

Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski@xxxxxxxxx>

--
Zbigniew 

>  		goto exit;
>  	}
>  
> -- 
> 2.25.1
> 
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