[RFC i-g-t 3/5] lib/igt_device_scan: Remember PCI card index after scanning

[Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>]

From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

After devices are sorted post scanning, assing a card index to each so it
can be easily accessed if PCI filter for a card needs to be printed out.

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 | 43 ++++++++++++++++++++++++++++++++++++-------
 1 file changed, 36 insertions(+), 7 deletions(-)

diff --git a/lib/igt_device_scan.c b/lib/igt_device_scan.c
index c0cd6757fc27..72653403f705 100644
--- a/lib/igt_device_scan.c
+++ b/lib/igt_device_scan.c
@@ -166,6 +166,7 @@ struct igt_device {
 	char *vendor;
 	char *device;
 	char *pci_slot_name;
+	int pci_index;
 
 	struct igt_list_head link;
 };
@@ -601,6 +602,33 @@ static void sort_all_devices(void)
 	free(devs);
 }
 
+static void index_pci_devices(void)
+{
+	struct igt_device *dev;
+
+	igt_list_for_each_entry(dev, &igt_devs.all, link) {
+		struct igt_device *dev2;
+		int index = 0;
+
+		if (!is_pci_subsystem(dev))
+			continue;
+
+		igt_list_for_each_entry(dev2, &igt_devs.all, link) {
+			if (!is_pci_subsystem(dev2))
+				continue;
+
+			if (dev2 == dev)
+				break;
+
+			if (!strcasecmp(dev->vendor, dev2->vendor) &&
+			    !strcasecmp(dev->device, dev2->device))
+				index++;
+		}
+
+		dev->pci_index = index;
+	}
+}
+
 /* Core scanning function.
  *
  * All scanned devices are kept inside igt_devs.all pointer array.
@@ -657,6 +685,7 @@ static void scan_drm_devices(void)
 	udev_unref(udev);
 
 	sort_all_devices();
+	index_pci_devices();
 
 	igt_list_for_each_entry(dev, &igt_devs.all, link) {
 		struct igt_device *dev_dup = duplicate_device(dev);
@@ -1105,13 +1134,13 @@ static struct igt_list_head *filter_pci(const struct filter_class *fcls,
 		if (filter->data.device && strcasecmp(filter->data.device, dev->device))
 			continue;
 
-		/* We get n-th card */
-		if (!card) {
-			struct igt_device *dup = duplicate_device(dev);
-			igt_list_add_tail(&dup->link, &igt_devs.filtered);
-			break;
-		}
-		card--;
+		/* Skip if 'card' doesn't match */
+		if (card != dev->pci_index)
+			continue;
+
+		dev = duplicate_device(dev);
+		igt_list_add_tail(&dev->link, &igt_devs.filtered);
+		break;
 	}
 
 	DBG("Filter pci filtered size: %d\n", igt_list_length(&igt_devs.filtered));
-- 
2.25.1

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