[PATCH] tests/kms_drrs: fb change notification through debugfs

[Ramalingam C <ramalingam.c@intel.com>]

At present there are some functional issues at front buffer tracking.
So to test the DRRS feature and the DRRS test apps, we have added a
debugfs to provide the fb change notification. Corresponding calls
implemented in this change

DO NOT MERGE: As this is a temperary fix to test the DRRS independent
of the front buffer tracking. This will be dropped once the front buffer
tracking is fixed.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 tests/kms_drrs.c |   71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/tests/kms_drrs.c b/tests/kms_drrs.c
index 91bda5c..8e2338d 100644
--- a/tests/kms_drrs.c
+++ b/tests/kms_drrs.c
@@ -37,6 +37,20 @@ IGT_TEST_DESCRIPTION(
 
 #define DRRS_STATUS_BYTES_CNT			1000
 
+#define INTEL_FRONTBUFFER_BITS_PER_PIPE 4
+#define INTEL_FRONTBUFFER_BITS \
+	(INTEL_FRONTBUFFER_BITS_PER_PIPE * I915_MAX_PIPES)
+#define INTEL_FRONTBUFFER_PRIMARY(pipe) \
+	(1 << (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)))
+#define INTEL_FRONTBUFFER_CURSOR(pipe) \
+	(1 << (1 + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
+#define INTEL_FRONTBUFFER_SPRITE(pipe) \
+	(1 << (2 + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
+#define INTEL_FRONTBUFFER_OVERLAY(pipe) \
+	(1 << (3 + (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))))
+#define INTEL_FRONTBUFFER_ALL_MASK(pipe) \
+	(0xf << (INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe)))
+
 typedef struct {
 	int drm_fd;
 	uint32_t devid;
@@ -126,6 +140,36 @@ static bool is_drrs_state(data_t *data, const char str[15])
 	return strstr(status, str) != NULL;
 
 }
+/*
+ * drrs_fb_status_update:
+ *
+ * drm front buffer tracking is not notifying the FB status change in
+ * many cases.
+ * Hence to test the DRRS module independently we are providing the DRRS
+ * invalidate and flush calls through a debugfs. NOTE: Additional kernel
+ * patch is required to add the required debugfs and to detach the DRRS module
+ * from the front buffer tracking implementation
+ */
+static void drrs_fb_status_update(data_t *data, unsigned fb_status_bits,
+								bool rendered)
+{
+	FILE *ctl;
+	size_t written;
+	struct fb_status fb_status;
+
+	igt_info("Entry to drrs_fb_status_update with fb_status_bits %u\n",
+								fb_status_bits);
+
+	ctl = igt_debugfs_fopen("i915_drrs_fb_status", "r+");
+
+	fb_status.rendered = rendered;
+	fb_status.fb_bits = fb_status_bits;
+
+	written = fwrite(&fb_status, sizeof(fb_status), 1, ctl);
+	igt_assert_eq(written, 1);
+
+	fclose(ctl);
+}
 
 static bool prepare_crtc(data_t *data)
 {
@@ -196,6 +240,15 @@ static bool execute_test(data_t *data)
 		return false;
 	}
 
+	/*
+	 * FIXME: When Front buffer tracking is fixed, remove
+	 * next two function calls.
+	 */
+	drrs_fb_status_update(data, INTEL_FRONTBUFFER_PRIMARY(data->pipe),
+									false);
+	drrs_fb_status_update(data, INTEL_FRONTBUFFER_PRIMARY(data->pipe),
+									true);
+
 	igt_wait_for_vblank(data->drm_fd, data->pipe);
 
 
@@ -222,6 +275,15 @@ static bool execute_test(data_t *data)
 	igt_plane_set_fb(data->primary, &data->fb[0]);
 	igt_display_commit(display);
 
+	/*
+	 * FIXME: When Front buffer tracking is fixed, remove
+	 * next two function calls.
+	 */
+	drrs_fb_status_update(data, INTEL_FRONTBUFFER_PRIMARY(data->pipe),
+									false);
+	drrs_fb_status_update(data, INTEL_FRONTBUFFER_PRIMARY(data->pipe),
+									true);
+
 	igt_wait_for_vblank(data->drm_fd, data->pipe);
 
 	if (is_drrs_state(data, "DRRS_HIGH_RR")) {
@@ -246,6 +308,15 @@ static bool execute_test(data_t *data)
 	igt_plane_set_fb(data->primary, &data->fb[1]);
 	igt_display_commit(display);
 
+	/*
+	 * FIXME: When Front buffer tracking is fixed, remove
+	 * next two function calls.
+	 */
+	drrs_fb_status_update(data, INTEL_FRONTBUFFER_PRIMARY(data->pipe),
+									false);
+	drrs_fb_status_update(data, INTEL_FRONTBUFFER_PRIMARY(data->pipe),
+									true);
+
 	igt_wait_for_vblank(data->drm_fd, data->pipe);
 
 	if (is_drrs_state(data, "DRRS_HIGH_RR")) {
-- 
1.7.9.5

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