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Date:   Tue,  5 Oct 2021 17:16:35 -0300
From:   Igor Matheus Andrade Torrente <igormtorrente@...il.com>
To:     rodrigosiqueiramelo@...il.com, melissa.srw@...il.com
Cc:     Igor Matheus Andrade Torrente <igormtorrente@...il.com>,
        hamohammed.sa@...il.com, daniel@...ll.ch, airlied@...ux.ie,
        contact@...rsion.fr, leandro.ribeiro@...labora.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        lkcamp@...ts.libreplanetbr.org
Subject: [PATCH 4/6] drm: vkms: Add fb information to `vkms_writeback_job`

This commit is the groundwork to introduce new formats to the planes and
writeback buffer. As part of it, a new buffer metadata field is added to
`vkms_writeback_job`, this metadata is represented by the `vkms_composer`
struct.

This will allow us, in the future, to have different compositing and wb
format types.

Signed-off-by: Igor Matheus Andrade Torrente <igormtorrente@...il.com>
---
 drivers/gpu/drm/vkms/vkms_drv.h       | 10 +++++-----
 drivers/gpu/drm/vkms/vkms_writeback.c | 16 +++++++++++++---
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 64e62993b06f..d62f8ebd454b 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -20,11 +20,6 @@
 #define XRES_MAX  8192
 #define YRES_MAX  8192
 
-struct vkms_writeback_job {
-	struct dma_buf_map map[DRM_FORMAT_MAX_PLANES];
-	struct dma_buf_map data[DRM_FORMAT_MAX_PLANES];
-};
-
 struct vkms_composer {
 	struct drm_framebuffer fb;
 	struct drm_rect src, dst;
@@ -34,6 +29,11 @@ struct vkms_composer {
 	unsigned int cpp;
 };
 
+struct vkms_writeback_job {
+	struct dma_buf_map data[DRM_FORMAT_MAX_PLANES];
+	struct vkms_composer composer;
+};
+
 /**
  * vkms_plane_state - Driver specific plane state
  * @base: base plane state
diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
index 8694227f555f..5a3e12f105dc 100644
--- a/drivers/gpu/drm/vkms/vkms_writeback.c
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -75,7 +75,7 @@ static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
 	if (!vkmsjob)
 		return -ENOMEM;
 
-	ret = drm_gem_fb_vmap(job->fb, vkmsjob->map, vkmsjob->data);
+	ret = drm_gem_fb_vmap(job->fb, vkmsjob->composer.map, vkmsjob->data);
 	if (ret) {
 		DRM_ERROR("vmap failed: %d\n", ret);
 		goto err_kfree;
@@ -99,7 +99,7 @@ static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
 	if (!job->fb)
 		return;
 
-	drm_gem_fb_vunmap(job->fb, vkmsjob->map);
+	drm_gem_fb_vunmap(job->fb, vkmsjob->composer.map);
 
 	vkmsdev = drm_device_to_vkms_device(job->fb->dev);
 	vkms_set_composer(&vkmsdev->output, false);
@@ -116,14 +116,24 @@ static void vkms_wb_atomic_commit(struct drm_connector *conn,
 	struct drm_writeback_connector *wb_conn = &output->wb_connector;
 	struct drm_connector_state *conn_state = wb_conn->base.state;
 	struct vkms_crtc_state *crtc_state = output->composer_state;
+	struct drm_framebuffer *fb = connector_state->writeback_job->fb;
+	struct vkms_writeback_job *active_wb;
+	struct vkms_composer *wb_composer;
 
 	if (!conn_state)
 		return;
 
 	vkms_set_composer(&vkmsdev->output, true);
 
+	active_wb = conn_state->writeback_job->priv;
+	wb_composer = &active_wb->composer;
+
 	spin_lock_irq(&output->composer_lock);
-	crtc_state->active_writeback = conn_state->writeback_job->priv;
+	crtc_state->active_writeback = active_wb;
+	memcpy(&wb_composer->fb, fb, sizeof(struct drm_framebuffer));
+	wb_composer->offset = fb->offsets[0];
+	wb_composer->pitch = fb->pitches[0];
+	wb_composer->cpp = fb->format->cpp[0];
 	crtc_state->wb_pending = true;
 	spin_unlock_irq(&output->composer_lock);
 	drm_writeback_queue_job(wb_conn, connector_state);
-- 
2.30.2

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