[igt-dev] [PATCH i-g-t 3/4] lib/igt_device_scan: Add extra helpers for intel_gpu_top

[Arkadiusz Hiler]

From: Ayaz A Siddiqui <ayaz.siddiqui at intel.com>

Will be used in the next patch.

1. set_pci_slot_name(): stores PCI_SLOT_NAME from prop to device
2. igt_device_find_first_discrete_card(): try to find first discrete GPU
3. igt_devices_free(): Free device buffers created during scan

Signed-off-by: Ayaz A Siddiqui <ayaz.siddiqui at intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
---
 lib/igt_device_scan.c | 80 ++++++++++++++++++++++++++++++++++++-------
 lib/igt_device_scan.h |  7 +++-
 2 files changed, 74 insertions(+), 13 deletions(-)

diff --git a/lib/igt_device_scan.c b/lib/igt_device_scan.c
index d4c5cfdf..12fbd241 100644
--- a/lib/igt_device_scan.c
+++ b/lib/igt_device_scan.c
@@ -165,6 +165,7 @@ struct igt_device {
 	/* For pci subsystem */
 	char *vendor;
 	char *device;
+	char *pci_slot_name;
 
 	struct igt_list_head link;
 };
@@ -338,7 +339,21 @@ static void get_attrs(struct udev_device *dev, struct igt_device *idev)
 #define is_drm_subsystem(dev)  (strequal(get_prop_subsystem(dev), "drm"))
 #define is_pci_subsystem(dev)  (strequal(get_prop_subsystem(dev), "pci"))
 
-/* Gets PCI_ID property, splits to xxxx:yyyy and stores
+/*
+ * Get PCI_SLOT_NAME property, it should be in format of
+ * xxxx:yy:zz.z
+ */
+static void set_pci_slot_name(struct igt_device *dev)
+{
+	const char *pci_slot_name = get_prop(dev, "PCI_SLOT_NAME");
+
+	if (!pci_slot_name || (strlen(pci_slot_name) != PCI_SLOT_NAME_SIZE))
+		return;
+	dev->pci_slot_name = strdup(pci_slot_name);
+}
+
+/*
+ * Gets PCI_ID property, splits to xxxx:yyyy and stores
  * xxxx to dev->vendor and yyyy to dev->device for
  * faster access.
  */
@@ -411,6 +426,45 @@ static struct igt_device *igt_device_find(const char *subsystem,
 	return NULL;
 }
 
+static void
+__copy_dev_to_card(struct igt_device *dev, struct igt_device_card *card)
+{
+	if (dev->subsystem != NULL)
+		strncpy(card->subsystem, dev->subsystem,
+			sizeof(card->subsystem) - 1);
+
+	if (dev->drm_card != NULL)
+		strncpy(card->card, dev->drm_card, sizeof(card->card) - 1);
+
+	if (dev->drm_render != NULL)
+		strncpy(card->render, dev->drm_render,
+			sizeof(card->render) - 1);
+
+	if (dev->pci_slot_name != NULL)
+		strncpy(card->pci_slot_name, dev->pci_slot_name,
+			PCI_SLOT_NAME_SIZE + 1);
+}
+
+/*
+ * Iterate over all igt_devices array and find first discrete card.
+ * card->pci_slot_name will be updated only if a discrete card is present.
+ */
+void igt_device_find_first_discrete_card(struct igt_device_card *card)
+{
+	struct igt_device *dev;
+
+	igt_list_for_each_entry(dev, &igt_devs.all, link) {
+
+		if (!is_pci_subsystem(dev))
+			continue;
+
+		if ((strncmp(dev->pci_slot_name, INTEGRATED_GPU_PCI_ID, PCI_SLOT_NAME_SIZE)) != 0) {
+			__copy_dev_to_card(dev, card);
+			break;
+		}
+	}
+}
+
 static struct igt_device *igt_device_from_syspath(const char *syspath)
 {
 	struct igt_device *dev;
@@ -446,6 +500,7 @@ static void update_or_add_parent(struct udev_device *dev,
 		parent_idev = igt_device_new_from_udev(parent_dev);
 		if (is_pci_subsystem(parent_idev)) {
 			set_vendor_device(parent_idev);
+			set_pci_slot_name(parent_idev);
 		}
 		igt_list_add_tail(&parent_idev->link, &igt_devs.all);
 	}
@@ -574,10 +629,21 @@ static void igt_device_free(struct igt_device *dev)
 	free(dev->drm_render);
 	free(dev->vendor);
 	free(dev->device);
+	free(dev->pci_slot_name);
 	g_hash_table_destroy(dev->attrs_ht);
 	g_hash_table_destroy(dev->props_ht);
 }
 
+void igt_devices_free(void)
+{
+	struct igt_device *dev, *tmp;
+
+	igt_list_for_each_entry_safe(dev, tmp, &igt_devs.all, link) {
+		igt_device_free(dev);
+		free(dev);
+	}
+}
+
 /**
  * igt_devices_scan
  * @force: enforce scanning devices
@@ -1197,17 +1263,7 @@ bool igt_device_card_match(const char *filter, struct igt_device_card *card)
 	/* We take first one if more than one card matches filter */
 	dev = igt_list_first_entry(&igt_devs.filtered, dev, link);
 
-	if (dev->subsystem != NULL)
-		strncpy(card->subsystem, dev->subsystem,
-			     sizeof(card->subsystem) - 1);
-
-	if (dev->drm_card != NULL)
-		strncpy(card->card, dev->drm_card,
-			     sizeof(card->card) - 1);
-
-	if (dev->drm_render != NULL)
-		strncpy(card->render, dev->drm_render,
-			     sizeof(card->render) - 1);
+	__copy_dev_to_card(dev, card);
 
 	return true;
 }
diff --git a/lib/igt_device_scan.h b/lib/igt_device_scan.h
index 3526f1da..2e73ecb7 100644
--- a/lib/igt_device_scan.h
+++ b/lib/igt_device_scan.h
@@ -39,10 +39,13 @@ enum igt_devices_print_type {
 	IGT_PRINT_DETAIL,
 };
 
+#define INTEGRATED_GPU_PCI_ID "0000:00:02.0"
+#define PCI_SLOT_NAME_SIZE 12
 struct igt_device_card {
 	char subsystem[NAME_MAX];
 	char card[NAME_MAX];
 	char render[NAME_MAX];
+	char pci_slot_name[PCI_SLOT_NAME_SIZE+1];
 };
 
 void igt_devices_scan(bool force);
@@ -51,6 +54,8 @@ void igt_devices_print(enum igt_devices_print_type printtype);
 void igt_devices_print_vendors(void);
 void igt_device_print_filter_types(void);
 
+void igt_devices_free(void);
+
 /*
  * Handle device filter collection array.
  * IGT can store/retrieve filters passed by user using '--device' args.
@@ -63,7 +68,7 @@ const char *igt_device_filter_get(int num);
 
 /* Use filter to match the device and fill card structure */
 bool igt_device_card_match(const char *filter, struct igt_device_card *card);
-
+void igt_device_find_first_discrete_card(struct igt_device_card *card);
 int igt_open_card(struct igt_device_card *card);
 int igt_open_render(struct igt_device_card *card);
 
-- 
2.25.4