[PATCH i-g-t v14 1/5] lib/igt_device_scan: Introduce filtering out non-PCI devices

[Kamil Konieczny <kamil.konieczny@linux.intel.com>]

From: Dominik Karol Piątkowski <dominik.karol.piatkowski@intel.com>

Introduced igt_device_filter_pci function that filters out non-PCI
devices from IGT devices. This will help with checking multi-GPU
tests after they skip due to detected only one GPU, in that case
one can verify it after printing what GPUs are really on PCI bus.
Such errors can happen when using wrong env IGT_DEVICE filter.

v6: extending description
v9: fix memory leak in loop (Zbigniew)

Cc: Chris Wilson <chris.p.wilson@linux.intel.com>
Cc: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Signed-off-by: Dominik Karol Piątkowski <dominik.karol.piatkowski@intel.com>
Signed-off-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
---
 lib/igt_device_scan.c | 23 +++++++++++++++++++++++
 lib/igt_device_scan.h |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/lib/igt_device_scan.c b/lib/igt_device_scan.c
index fbf3fa482..9a2da3d62 100644
--- a/lib/igt_device_scan.c
+++ b/lib/igt_device_scan.c
@@ -1908,6 +1908,29 @@ const char *igt_device_filter_get(int num)
 	return NULL;
 }
 
+/**
+ * igt_device_filter_pci
+ *
+ * Filter devices to PCI only.
+ *
+ * Returns PCI devices count.
+ */
+int igt_device_filter_pci(void)
+{
+	int count = 0;
+	struct igt_device *dev, *tmp;
+
+	igt_list_for_each_entry_safe(dev, tmp, &igt_devs.filtered, link)
+		if (strcmp(dev->subsystem, "pci") != 0) {
+			igt_list_del(&dev->link);
+			free(dev);
+		} else {
+			count++;
+		}
+
+	return count;
+}
+
 static bool igt_device_filter_apply(const char *fstr)
 {
 	struct igt_device *dev, *tmp;
diff --git a/lib/igt_device_scan.h b/lib/igt_device_scan.h
index 48690e236..908733745 100644
--- a/lib/igt_device_scan.h
+++ b/lib/igt_device_scan.h
@@ -81,6 +81,8 @@ int igt_device_filter_add(const char *filter);
 void igt_device_filter_free_all(void);
 const char *igt_device_filter_get(int num);
 
+int igt_device_filter_pci(void);
+
 /* Use filter to match the device and fill card structure */
 bool igt_device_card_match(const char *filter, struct igt_device_card *card);
 bool igt_device_card_match_pci(const char *filter,
-- 
2.42.0