[PATCH i-g-t] tools/lsgpu: Add switch to display gpu pci devices

["Zbigniew Kempczyński" <zbigniew.kempczynski@intel.com>]

Device scanning in IGT is based on iterating over udev drm devices. This
limits to display only to devices which have driver loaded.

To remove this limitation add dedicated udev pci scanning in lsgpu which
displays all gpu devices (pci class 0x30000).

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
---
 tools/lsgpu.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 82 insertions(+), 2 deletions(-)

diff --git a/tools/lsgpu.c b/tools/lsgpu.c
index da84e20505..846da99196 100644
--- a/tools/lsgpu.c
+++ b/tools/lsgpu.c
@@ -30,6 +30,7 @@
 #include <string.h>
 #include <signal.h>
 #include <glib.h>
+#include <libudev.h>
 
 /**
  * SECTION:lsgpu
@@ -77,12 +78,14 @@ enum {
 	OPT_LIST_VENDORS   = 'v',
 	OPT_LIST_FILTERS   = 'l',
 	OPT_DEVICE         = 'd',
-	OPT_HELP           = 'h'
+	OPT_HELP           = 'h',
+	OPT_PCISCAN        = 'P',
 };
 
 static bool g_show_vendors;
 static bool g_list_filters;
 static bool g_help;
+static bool g_pciscan;
 static char *igt_device;
 
 static const char *usage_str =
@@ -158,6 +161,77 @@ static char *get_device_from_rc(void)
 	return rc_device;
 }
 
+static int pciscan(void)
+{
+	struct udev *udev;
+	struct udev_enumerate *enumerate;
+	struct udev_list_entry *devices, *dev_list_entry;
+	struct igt_device_card card;
+	int ret, n = 0;
+
+	udev = udev_new();
+	igt_assert(udev);
+
+	enumerate = udev_enumerate_new(udev);
+	igt_assert(enumerate);
+
+	printf("Scanning pci subsystem\n");
+	printf("----------------------\n");
+	ret = udev_enumerate_add_match_subsystem(enumerate, "pci");
+	igt_assert(!ret);
+
+	ret = udev_enumerate_add_match_property(enumerate, "PCI_CLASS", "30000");
+	igt_assert(!ret);
+
+	ret = udev_enumerate_scan_devices(enumerate);
+	igt_assert(!ret);
+
+	devices = udev_enumerate_get_list_entry(enumerate);
+	if (!devices) {
+		printf("No pci devices with class 0x30000 found\n");
+		return 0;
+	}
+
+	udev_list_entry_foreach(dev_list_entry, devices) {
+		const char *path;
+		struct udev_device *udev_dev;
+		struct udev_list_entry *entry;
+		char *codename;
+
+		path = udev_list_entry_get_name(dev_list_entry);
+		udev_dev = udev_device_new_from_syspath(udev, path);
+		printf("[%s]\n", path);
+
+		strcpy(card.pci_slot_name, "-");
+		entry = udev_device_get_properties_list_entry(udev_dev);
+		while (entry) {
+			const char *name = udev_list_entry_get_name(entry);
+			const char *value = udev_list_entry_get_value(entry);
+
+			entry = udev_list_entry_get_next(entry);
+			if (!strcmp(name, "ID_VENDOR_FROM_DATABASE"))
+				printf("  vendor [db]: %s\n", value);
+			else if (!strcmp(name, "ID_MODEL_FROM_DATABASE"))
+				printf("  model  [db]: %s\n", value);
+			else if (!strcmp(name, "DRIVER"))
+				printf("  driver     : %s\n", value);
+			else if (!strcmp(name, "PCI_ID"))
+				igt_assert_eq(sscanf(value, "%hx:%hx",
+						     &card.pci_vendor, &card.pci_device), 2);
+		}
+		codename = igt_device_get_pretty_name(&card, false);
+		printf("  codename   : %s\n", codename);
+
+		udev_device_unref(udev_dev);
+		n++;
+	}
+
+	udev_enumerate_unref(enumerate);
+	udev_unref(udev);
+
+	return 0;
+}
+
 int main(int argc, char *argv[])
 {
 	static struct option long_options[] = {
@@ -180,7 +254,7 @@ int main(int argc, char *argv[])
 			.type = IGT_PRINT_USER,
 	};
 
-	while ((c = getopt_long(argc, argv, "ncspvld:h",
+	while ((c = getopt_long(argc, argv, "ncspvld:hP",
 				long_options, &index)) != -1) {
 		switch(c) {
 
@@ -208,6 +282,9 @@ int main(int argc, char *argv[])
 		case OPT_HELP:
 			g_help = true;
 			break;
+		case OPT_PCISCAN:
+			g_pciscan = true;
+			break;
 		case 0:
 			fmt.option = IGT_PRINT_DRM;
 			break;
@@ -220,6 +297,9 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if (g_pciscan)
+		return pciscan();
+
 	if (g_help) {
 		printf("%s\n", usage_str);
 		exit(0);
-- 
2.34.1