[PATCH i-g-t v8 1/4] lib/igt_kms: Add support to retrieve async modifiers and formats

[Santhosh Reddy Guddati <santhosh.reddy.guddati@intel.com>]

Parse "IN_FORMATS_ASYNC" plane property to identify supported
format modifier pairs for async flips

V2: Add new fields async_formats and reset idx.

V3: Improve commit message , remove unused declaration (Chaitanya)
    Introduce structure to hold a format modifier and its
    associated format list.

V4: Implement format+modifier tuples for async similar to IN_FORMATS
    (Chaitanya).

V5: Re use local variables for async formats and free blob after
    usage(Chaitanya)

V6: Initialize async_modifiers and async_formats to NULL. (Chaitanya)

V7: Fix async format count to return 0 on failures (Chaitanya)

Signed-off-by: Santhosh Reddy Guddati <santhosh.reddy.guddati@intel.com>
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
---
 lib/igt_kms.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++--
 lib/igt_kms.h |  7 ++++++-
 2 files changed, 60 insertions(+), 3 deletions(-)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index cc3bb3ae7..c6c3f1894 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -701,6 +701,7 @@ const char * const igt_plane_prop_names[IGT_NUM_PLANE_PROPS] = {
 	[IGT_PLANE_FB_DAMAGE_CLIPS] = "FB_DAMAGE_CLIPS",
 	[IGT_PLANE_SCALING_FILTER] = "SCALING_FILTER",
 	[IGT_PLANE_SIZE_HINTS] = "SIZE_HINTS",
+	[IGT_PLANE_IN_FORMATS_ASYNC] = "IN_FORMATS_ASYNC",
 };
 
 const char * const igt_crtc_prop_names[IGT_NUM_CRTC_PROPS] = {
@@ -5759,10 +5760,12 @@ static int igt_count_plane_format_mod(const struct drm_format_modifier_blob *blo
 static void igt_fill_plane_format_mod(igt_display_t *display, igt_plane_t *plane)
 {
 	const struct drm_format_modifier_blob *blob_data;
+	const struct drm_format_modifier *async_modifiers = NULL;
 	drmModePropertyBlobPtr blob;
 	uint64_t blob_id;
 	int idx = 0;
-	int count;
+	int count = 0;
+	const uint32_t *async_formats = NULL;
 
 	if (!igt_plane_has_prop(plane, IGT_PLANE_IN_FORMATS)) {
 		drmModePlanePtr p = plane->drm_plane;
@@ -5796,8 +5799,10 @@ static void igt_fill_plane_format_mod(igt_display_t *display, igt_plane_t *plane
 	blob_data = (const struct drm_format_modifier_blob *) blob->data;
 
 	count = igt_count_plane_format_mod(blob_data);
-	if (!count)
+	if (!count) {
+		drmModeFreePropertyBlob(blob);
 		return;
+	}
 
 	plane->format_mod_count = count;
 	plane->formats = calloc(count, sizeof(plane->formats[0]));
@@ -5822,6 +5827,53 @@ static void igt_fill_plane_format_mod(igt_display_t *display, igt_plane_t *plane
 	}
 
 	igt_assert_eq(idx, plane->format_mod_count);
+
+	drmModeFreePropertyBlob(blob);
+
+	if (!igt_plane_has_prop(plane, IGT_PLANE_IN_FORMATS_ASYNC))
+		return;
+
+	blob_id = igt_plane_get_prop(plane, IGT_PLANE_IN_FORMATS_ASYNC);
+	blob = drmModeGetPropertyBlob(display->drm_fd, blob_id);
+
+	if (!blob)
+		return;
+
+	blob_data = (const struct drm_format_modifier_blob *)blob->data;
+	count = igt_count_plane_format_mod(blob_data);
+
+	if (!count) {
+		plane->async_format_mod_count = 0;
+		drmModeFreePropertyBlob(blob);
+		return;
+	}
+
+	plane->async_format_mod_count = count;
+	plane->async_modifiers = calloc(count, sizeof(plane->async_modifiers[0]));
+	igt_assert(plane->async_modifiers);
+
+	plane->async_formats = calloc(count, sizeof(plane->async_formats[0]));
+	igt_assert(plane->async_formats);
+
+	idx = 0;
+	for (int i = 0; i < blob_data->count_modifiers; i++) {
+		for (int j = 0; j < 64; j++) {
+			async_modifiers = modifiers_ptr(blob_data);
+			async_formats = formats_ptr(blob_data);
+
+			if (!(async_modifiers[i].formats & (1ULL << j)))
+				continue;
+
+			plane->async_formats[idx] = async_formats[async_modifiers[i].offset + j];
+			plane->async_modifiers[idx] = async_modifiers[i].modifier;
+			idx++;
+			igt_assert_lte(idx, plane->async_format_mod_count);
+		}
+	}
+
+	igt_assert_eq(idx, plane->async_format_mod_count);
+
+	drmModeFreePropertyBlob(blob);
 }
 
 /**
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 27b545f52..78d6a7ee4 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -365,7 +365,8 @@ enum igt_atomic_plane_properties {
        IGT_PLANE_HOTSPOT_X,
        IGT_PLANE_HOTSPOT_Y,
        IGT_PLANE_SIZE_HINTS,
-       IGT_NUM_PLANE_PROPS
+       IGT_PLANE_IN_FORMATS_ASYNC,
+       IGT_NUM_PLANE_PROPS,
 };
 
 /**
@@ -438,6 +439,10 @@ typedef struct igt_plane {
 	uint64_t *modifiers;
 	uint32_t *formats;
 	int format_mod_count;
+
+	uint64_t *async_modifiers;
+	uint32_t *async_formats;
+	int async_format_mod_count;
 } igt_plane_t;
 
 /*
-- 
2.34.1