[Intel-gfx] [RFC i-g-t] intel_gpu_top: User friendly device listing

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Adding a new device selection print type suitable for user-facing
use cases like intel_gpu_top -L and potentially 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@intel.com>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
---
 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 f4d43c733314..ce0ea61dda50 100644
--- a/lib/igt_device_scan.c
+++ b/lib/igt_device_scan.c
@@ -695,18 +695,26 @@ 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)
@@ -728,6 +736,89 @@ 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);
@@ -752,14 +843,9 @@ 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);
@@ -781,6 +867,7 @@ 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 bd937d22752c..9e13ed9db406 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 79a936ffbe1a..b984edc656c7 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);
 		goto exit;
 	}
 
-- 
2.25.1

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