[PATCH i-g-t v4] tools/lsgpu: Add switch to display gpu pci devices

[Zbigniew Kempczyński]

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 or 0x38000).

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Kamil Konieczny <kamil.konieczny at linux.intel.com>
---
v2: Remove unnecessary variable
    Add pci-id and use codename only when is pretty
v3: Add class 0x38000 (Kamil)
    Add --pci-scan long opt
v4: Add 0x38000 in commit msg
    Clean up in case of empty devices scan (Kamil)
---
 tools/lsgpu.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 92 insertions(+), 2 deletions(-)

diff --git a/tools/lsgpu.c b/tools/lsgpu.c
index da84e20505..bdc6671fe1 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 =
@@ -92,6 +95,7 @@ static const char *usage_str =
 	"  -c, --codename              Print codename instead pretty device name\n"
 	"  -s, --print-simple          Print simple (legacy) device details\n"
 	"  -p, --print-details         Print devices with details\n"
+	"  -P, --pci-scan              Print pci display devices\n"
 	"  -v, --list-vendors          List recognized vendors\n"
 	"  -l, --list-filter-types     List registered device filters types\n"
 	"  -d, --device filter         Device filter, can be given multiple times\n"
@@ -158,6 +162,85 @@ 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;
+	char pcistr[10];
+	int ret;
+
+	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_add_match_property(enumerate, "PCI_CLASS", "38000");
+	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|0x38000 found\n");
+		goto out;
+	}
+
+	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);
+		}
+		snprintf(pcistr, sizeof(pcistr), "%04x:%04x",
+			 card.pci_vendor, card.pci_device);
+		printf("  pci id     : %s\n", pcistr);
+		codename = igt_device_get_pretty_name(&card, false);
+		if (strcmp(pcistr, codename))
+			printf("  codename   : %s\n", codename);
+		free(codename);
+
+		udev_device_unref(udev_dev);
+	}
+
+out:
+	udev_enumerate_unref(enumerate);
+	udev_unref(udev);
+
+	return 0;
+}
+
 int main(int argc, char *argv[])
 {
 	static struct option long_options[] = {
@@ -168,6 +251,7 @@ int main(int argc, char *argv[])
 		{"codename",          no_argument,       NULL, OPT_CODENAME},
 		{"print-simple",      no_argument,       NULL, OPT_PRINT_SIMPLE},
 		{"print-detail",      no_argument,       NULL, OPT_PRINT_DETAIL},
+		{"pci-scan",          no_argument,       NULL, OPT_PCISCAN},
 		{"list-vendors",      no_argument,       NULL, OPT_LIST_VENDORS},
 		{"list-filter-types", no_argument,       NULL, OPT_LIST_FILTERS},
 		{"device",            required_argument, NULL, OPT_DEVICE},
@@ -180,7 +264,7 @@ 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 +292,9 @@ 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 +307,9 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if (g_pciscan)
+		return pciscan();
+
 	if (g_help) {
 		printf("%s\n", usage_str);
 		exit(0);
-- 
2.34.1