[igt-dev] [PATCH i-g-t 1/6] lib/igt_kms: Add writeback support in lib/

[Liviu Dudau]

From: Brian Starkey <brian.starkey at arm.com>

Add support in igt_kms for Writeback connectors, with the ability to
attach framebuffers and retrieve fences.

Signed-off-by: Brian Starkey <brian.starkey at arm.com>
---
 lib/igt_kms.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 lib/igt_kms.h | 14 ++++++++++++
 2 files changed, 85 insertions(+), 1 deletion(-)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 022abfe7..00d9d2e2 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -190,7 +190,10 @@ const char *igt_connector_prop_names[IGT_NUM_CONNECTOR_PROPS] = {
 	"scaling mode",
 	"CRTC_ID",
 	"DPMS",
-	"Broadcast RGB"
+	"Broadcast RGB",
+	"WRITEBACK_PIXEL_FORMATS",
+	"WRITEBACK_FB_ID",
+	"WRITEBACK_OUT_FENCE_PTR"
 };
 
 /*
@@ -452,6 +455,7 @@ static const struct type_name connector_type_names[] = {
 	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
 	{ DRM_MODE_CONNECTOR_DSI, "DSI" },
 	{ DRM_MODE_CONNECTOR_DPI, "DPI" },
+	{ DRM_MODE_CONNECTOR_WRITEBACK, "Writeback" },
 	{}
 };
 
@@ -1947,6 +1951,7 @@ void igt_display_init(igt_display_t *display, int drm_fd)
 		output->force_reprobe = true;
 		output->id = resources->connectors[i];
 		output->display = display;
+		output->writeback_out_fence_fd = -1;
 
 		igt_output_refresh(output);
 	}
@@ -2040,6 +2045,43 @@ igt_output_t *igt_output_from_connector(igt_display_t *display,
 	return found;
 }
 
+void igt_output_set_writeback_fb(igt_output_t *output, struct igt_fb *fb)
+{
+	igt_display_t *display = output->display;
+	struct kmstest_connector_config *config = &output->config;
+
+	if (config->connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
+		return;
+
+	LOG(display, "%s: output_set_writeback_fb(%d)\n", output->name,
+	    fb ? fb->fb_id : 0);
+
+	output->writeback_fb = fb;
+}
+
+static void igt_output_reset_writeback_out_fence(igt_output_t *output)
+{
+	if (output->writeback_out_fence_fd >= 0) {
+		close(output->writeback_out_fence_fd);
+		output->writeback_out_fence_fd = -1;
+	}
+}
+
+void igt_output_request_writeback_out_fence(igt_output_t *output)
+{
+	igt_output_reset_writeback_out_fence(output);
+	igt_output_set_prop_value(output, IGT_CONNECTOR_WRITEBACK_OUT_FENCE_PTR,
+				  (ptrdiff_t)&output->writeback_out_fence_fd);
+}
+
+int igt_output_get_last_writeback_out_fence(igt_output_t *output)
+{
+	int fd = output->writeback_out_fence_fd;
+	output->writeback_out_fence_fd = -1;
+
+	return fd;
+}
+
 static void igt_pipe_fini(igt_pipe_t *pipe)
 {
 	int i;
@@ -2063,6 +2105,8 @@ static void igt_pipe_fini(igt_pipe_t *pipe)
 static void igt_output_fini(igt_output_t *output)
 {
 	kmstest_free_connector_config(&output->config);
+	if (output->writeback_out_fence_fd >= 0)
+		close(output->writeback_out_fence_fd);
 	free(output->name);
 	output->name = NULL;
 }
@@ -2879,6 +2923,31 @@ static void igt_atomic_prepare_connector_commit(igt_output_t *output, drmModeAto
 					  output->props[i],
 					  output->values[i]));
 	}
+
+	if (output->writeback_fb)
+		output->writeback_fb = NULL;
+
+	igt_output_reset_writeback_out_fence(output);
+}
+
+static void handle_writeback_out_fences(igt_display_t *display, uint32_t flags, int ret)
+{
+	int i;
+
+	for (i = 0; i < display->n_outputs; i++) {
+		igt_output_t *output = &display->outputs[i];
+
+		if (!output->config.connector)
+			continue;
+
+		if (!igt_output_is_prop_changed(output, IGT_CONNECTOR_WRITEBACK_OUT_FENCE_PTR))
+			continue;
+
+		igt_output_clear_prop_changed(output, IGT_CONNECTOR_WRITEBACK_OUT_FENCE_PTR);
+
+		if (ret || (flags & DRM_MODE_ATOMIC_TEST_ONLY))
+			igt_assert(output->writeback_out_fence_fd == -1);
+	}
 }
 
 /*
@@ -2929,6 +2998,7 @@ static int igt_atomic_commit(igt_display_t *display, uint32_t flags, void *user_
 	}
 
 	ret = drmModeAtomicCommit(display->drm_fd, req, flags, user_data);
+	handle_writeback_out_fences(display, flags, ret);
 
 	drmModeAtomicFree(req);
 	return ret;
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 1c46186e..59ccc4c6 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -38,6 +38,10 @@
 #include "igt_fb.h"
 #include "ioctl_wrappers.h"
 
+#ifndef DRM_MODE_CONNECTOR_WRITEBACK
+#define DRM_MODE_CONNECTOR_WRITEBACK   18
+#endif
+
 /* Low-level helpers with kmstest_ prefix */
 
 /**
@@ -120,6 +124,9 @@ enum igt_atomic_connector_properties {
        IGT_CONNECTOR_CRTC_ID,
        IGT_CONNECTOR_DPMS,
        IGT_CONNECTOR_BROADCAST_RGB,
+       IGT_CONNECTOR_WRITEBACK_PIXEL_FORMATS,
+       IGT_CONNECTOR_WRITEBACK_FB_ID,
+       IGT_CONNECTOR_WRITEBACK_OUT_FENCE_PTR,
        IGT_NUM_CONNECTOR_PROPS
 };
 
@@ -345,6 +352,9 @@ typedef struct {
 
 	uint32_t props[IGT_NUM_CONNECTOR_PROPS];
 	uint64_t values[IGT_NUM_CONNECTOR_PROPS];
+
+	struct igt_fb *writeback_fb;
+	int32_t writeback_out_fence_fd;
 } igt_output_t;
 
 struct igt_display {
@@ -380,6 +390,10 @@ igt_plane_t *igt_output_get_plane(igt_output_t *output, int plane_idx);
 igt_plane_t *igt_output_get_plane_type(igt_output_t *output, int plane_type);
 igt_output_t *igt_output_from_connector(igt_display_t *display,
     drmModeConnector *connector);
+void igt_output_set_writeback_fb(igt_output_t *output, struct igt_fb *fb);
+void igt_output_request_writeback_out_fence(igt_output_t *output);
+int igt_output_get_last_writeback_out_fence(igt_output_t *output);
+
 igt_plane_t *igt_pipe_get_plane_type(igt_pipe_t *pipe, int plane_type);
 
 void igt_pipe_request_out_fence(igt_pipe_t *pipe);
-- 
2.16.1