[PATCH i-g-t v11 2/5] lib/igt_device_scan: Enable finding all matched IGT devices

[Soham Purkait <soham.purkait@intel.com>]

Use filter to find all the available
GPUs or few among them by driver name
and card type or card number.

v2 : Fix for refactoring GPUTOP into a
     vendor-agnostic tool. (Lucas)

v3 : Separate commit for lib. (Kamil)

v4 : Refactor to use composition strategy
     for driver and device type filtering.
     Refactor code to improve memory
     allocation and error handling. (Lucas)

v5 : Introduce device card match function
     to return collection of matching
     devices using device filter.

v6 : Separate commit for device card match
     function.                     (Zbigniew)
     Function description modification for device
     card match function.          (Zbigniew)

v7 : Single return for card match function.
                                  (Krzysztof)

v8 : Removed 'drivers' array as card match
     function parameter.          (Zbigniew)

v9 : Fixed allocation in card match instead of
     multiple realloc.            (Zbigniew)

Signed-off-by: Soham Purkait <soham.purkait@intel.com>

Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Reviewed-by: Krzysztof Karas <krzysztof.karas@intel.com>
---
 lib/igt_device_scan.c | 48 +++++++++++++++++++++++++++++++++++++++++++
 lib/igt_device_scan.h |  1 +
 2 files changed, 49 insertions(+)

diff --git a/lib/igt_device_scan.c b/lib/igt_device_scan.c
index a250e7ee9..f11ebf02e 100644
--- a/lib/igt_device_scan.c
+++ b/lib/igt_device_scan.c
@@ -2143,6 +2143,54 @@ bool igt_device_card_match_pci(const char *filter,
        return __igt_device_card_match(filter, card, true);
 }
 
+/**
+ * igt_device_card_match_all
+ * @filter: filter string.
+ * @card: double pointer to igt_device_card structure, containing
+ * an array of igt_device_card structures upon successful return.
+ *
+ * Function applies filter to match device from device array.
+ *
+ * Returns: the number of cards found.
+ *
+ * Note: The caller is responsible for freeing the memory which is
+ * dynamically allocated for the array of igt_device_card structures
+ * upon successful return.
+ */
+int igt_device_card_match_all(const char *filter, struct igt_device_card **card)
+{
+	struct igt_device *dev = NULL;
+	struct igt_device_card *crd = NULL;
+	int count = 0;
+
+	igt_devices_scan();
+
+	if (igt_device_filter_apply(filter) == false)
+		return 0;
+
+	if (igt_list_empty(&igt_devs.filtered))
+		return 0;
+
+	igt_list_for_each_entry(dev, &igt_devs.filtered, link) {
+		count++;
+	}
+
+	crd = calloc(count, sizeof(struct igt_device_card));
+	if (!crd)
+		return 0;
+
+	count = 0;
+
+	igt_list_for_each_entry(dev, &igt_devs.filtered, link) {
+		__copy_dev_to_card(dev, crd + count++);
+	}
+
+	if (count)
+		*card = crd;
+
+	return count;
+}
+
 /**
  * igt_device_get_pretty_name
  * @card: pointer to igt_device_card struct
diff --git a/lib/igt_device_scan.h b/lib/igt_device_scan.h
index f1cd3b1e9..e6e31e799 100644
--- a/lib/igt_device_scan.h
+++ b/lib/igt_device_scan.h
@@ -89,6 +89,7 @@ int igt_device_filter_pci(void);
 bool igt_device_card_match(const char *filter, struct igt_device_card *card);
 bool igt_device_card_match_pci(const char *filter,
 	struct igt_device_card *card);
+int igt_device_card_match_all(const char *filter, struct igt_device_card **card);
 bool igt_device_find_first_i915_discrete_card(struct igt_device_card *card);
 bool igt_device_find_integrated_card(struct igt_device_card *card);
 bool igt_device_find_first_xe_discrete_card(struct igt_device_card *card);
-- 
2.34.1