Date:   Fri, 7 Jun 2019 09:48:08 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
Cc:     Brian Starkey <brian.starkey@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        Daniel Vetter <daniel@...ll.ch>,
        Haneen Mohammed <hamohammed.sa@...il.com>,
        Simon Ser <contact@...rsion.fr>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/vkms: Add support for writeback

On Thu, Jun 06, 2019 at 07:41:01PM -0300, Rodrigo Siqueira wrote:
> This patch implements the necessary functions to add writeback support
> for vkms. This feature is useful for testing compositors if you don’t
> have hardware with writeback support.
> 
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
> ---
>  drivers/gpu/drm/vkms/Makefile         |   9 +-
>  drivers/gpu/drm/vkms/vkms_crtc.c      |   5 +
>  drivers/gpu/drm/vkms/vkms_drv.c       |  10 ++
>  drivers/gpu/drm/vkms/vkms_drv.h       |  12 ++
>  drivers/gpu/drm/vkms/vkms_output.c    |   6 +
>  drivers/gpu/drm/vkms/vkms_writeback.c | 165 ++++++++++++++++++++++++++
>  6 files changed, 206 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/vkms/vkms_writeback.c
> 
> diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile
> index 89f09bec7b23..90eb7acd618d 100644
> --- a/drivers/gpu/drm/vkms/Makefile
> +++ b/drivers/gpu/drm/vkms/Makefile
> @@ -1,4 +1,11 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -vkms-y := vkms_drv.o vkms_plane.o vkms_output.o vkms_crtc.o vkms_gem.o vkms_crc.o
> +vkms-y := \
> +	vkms_drv.o \
> +	vkms_plane.o \
> +	vkms_output.o \
> +	vkms_crtc.o \
> +	vkms_gem.o \
> +	vkms_crc.o \
> +	vkms_writeback.o
>  
>  obj-$(CONFIG_DRM_VKMS) += vkms.o
> diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
> index 1bbe099b7db8..ce797e265b1b 100644
> --- a/drivers/gpu/drm/vkms/vkms_crtc.c
> +++ b/drivers/gpu/drm/vkms/vkms_crtc.c
> @@ -23,6 +23,11 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
>  	if (!ret)
>  		DRM_ERROR("vkms failure on handling vblank");
>  
> +	if (output->writeback_status == WB_START) {
> +		drm_writeback_signal_completion(&output->wb_connector, 0);
> +		output->writeback_status = WB_STOP;
> +	}
> +
>  	if (state && output->crc_enabled) {
>  		u64 frame = drm_crtc_accurate_vblank_count(crtc);
>  
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> index 92296bd8f623..d5917d5a45e3 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.c
> +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> @@ -29,6 +29,10 @@ bool enable_cursor;
>  module_param_named(enable_cursor, enable_cursor, bool, 0444);
>  MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");
>  
> +int enable_writeback;
> +module_param_named(enable_writeback, enable_writeback, int, 0444);
> +MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector");
> +
>  static const struct file_operations vkms_driver_fops = {
>  	.owner		= THIS_MODULE,
>  	.open		= drm_open,
> @@ -123,6 +127,12 @@ static int __init vkms_init(void)
>  		goto out_fini;
>  	}
>  
> +	vkms_device->output.writeback_status = WB_DISABLED;
> +	if (enable_writeback) {
> +		vkms_device->output.writeback_status = WB_STOP;
> +		DRM_INFO("Writeback connector enabled");
> +	}
> +
>  	ret = vkms_modeset_init(vkms_device);
>  	if (ret)
>  		goto out_fini;
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index e81073dea154..ca1f9ee63ec8 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -7,6 +7,7 @@
>  #include <drm/drm.h>
>  #include <drm/drm_gem.h>
>  #include <drm/drm_encoder.h>
> +#include <drm/drm_writeback.h>
>  #include <linux/hrtimer.h>
>  
>  #define XRES_MIN    20
> @@ -60,14 +61,22 @@ struct vkms_crtc_state {
>  	u64 frame_end;
>  };
>  
> +enum wb_status {
> +	WB_DISABLED,
> +	WB_START,
> +	WB_STOP,
> +};
> +
>  struct vkms_output {
>  	struct drm_crtc crtc;
>  	struct drm_encoder encoder;
>  	struct drm_connector connector;
> +	struct drm_writeback_connector wb_connector;
>  	struct hrtimer vblank_hrtimer;
>  	ktime_t period_ns;
>  	struct drm_pending_vblank_event *event;
>  	bool crc_enabled;
> +	enum wb_status writeback_status;
>  	/* ordered wq for crc_work */
>  	struct workqueue_struct *crc_workq;
>  	/* protects concurrent access to crc_data */
> @@ -141,4 +150,7 @@ int vkms_verify_crc_source(struct drm_crtc *crtc, const char *source_name,
>  			   size_t *values_cnt);
>  void vkms_crc_work_handle(struct work_struct *work);
>  
> +/* Writeback */
> +int enable_writeback_connector(struct vkms_device *vkmsdev);
> +
>  #endif /* _VKMS_DRV_H_ */
> diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> index 1442b447c707..1fc1d4e9585c 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -91,6 +91,12 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
>  		goto err_attach;
>  	}
>  
> +	if (vkmsdev->output.writeback_status != WB_DISABLED) {
> +		ret = enable_writeback_connector(vkmsdev);
> +		if (ret)
> +			DRM_ERROR("Failed to init writeback connector\n");
> +	}
> +
>  	drm_mode_config_reset(dev);
>  
>  	return 0;
> diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
> new file mode 100644
> index 000000000000..f7b962ae5646
> --- /dev/null
> +++ b/drivers/gpu/drm/vkms/vkms_writeback.c
> @@ -0,0 +1,165 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +#include "vkms_drv.h"
> +#include <drm/drm_writeback.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +
> +static const struct drm_connector_funcs vkms_wb_connector_funcs = {
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.destroy = drm_connector_cleanup,
> +	.reset = drm_atomic_helper_connector_reset,
> +	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
> +					struct drm_crtc_state *crtc_state,
> +					struct drm_connector_state *conn_state)
> +{
> +	struct drm_framebuffer *fb;
> +	const struct drm_display_mode *mode = &crtc_state->mode;
> +
> +	if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
> +		return 0;
> +
> +	fb = conn_state->writeback_job->fb;
> +	if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
> +		DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
> +			      fb->width, fb->height);
> +		return -EINVAL;
> +	}
> +
> +	if (fb->format->format != DRM_FORMAT_XRGB8888) {
> +		struct drm_format_name_buf format_name;
> +
> +		DRM_DEBUG_KMS("Invalid pixel format %s\n",
> +			      drm_get_format_name(fb->format->format,
> +						  &format_name));
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
> +	.atomic_check = vkms_wb_encoder_atomic_check,
> +};
> +
> +static int vkms_wb_connector_get_modes(struct drm_connector *connector)
> +{
> +	struct drm_device *dev = connector->dev;
> +
> +	return drm_add_modes_noedid(connector, dev->mode_config.max_width,
> +				    dev->mode_config.max_height);
> +}
> +
> +static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
> +			       struct drm_writeback_job *job)
> +{
> +	struct vkms_gem_object *vkms_obj;
> +	struct drm_gem_object *gem_obj;
> +	int ret;
> +
> +	if (!job->fb)
> +		return 0;
> +
> +	gem_obj = drm_gem_fb_get_obj(job->fb, 0);
> +	ret = vkms_gem_vmap(gem_obj);
> +	if (ret) {
> +		DRM_ERROR("vmap failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	vkms_obj = drm_gem_to_vkms_gem(gem_obj);
> +	job->priv = vkms_obj->vaddr;
> +
> +	return 0;
> +}
> +
> +static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
> +				struct drm_writeback_job *job)
> +{
> +	struct drm_gem_object *gem_obj;
> +
> +	if (!job->fb)
> +		return;
> +
> +	gem_obj = drm_gem_fb_get_obj(job->fb, 0);
> +	vkms_gem_vunmap(gem_obj);
> +}
> +
> +static void vkms_wb_atomic_commit(struct drm_connector *conn,
> +				  struct drm_connector_state *state)
> +{
> +	struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
> +	struct vkms_output *output = &vkmsdev->output;
> +	struct drm_writeback_connector *wb_conn = &output->wb_connector;
> +	struct drm_connector_state *conn_state = wb_conn->base.state;
> +	void *priv_data = conn_state->writeback_job->priv;
> +	struct vkms_crc_data *primary_data = NULL;
> +	struct drm_framebuffer *fb = NULL;
> +	struct vkms_gem_object *vkms_obj;
> +	struct drm_gem_object *gem_obj;
> +	struct drm_plane *plane;
> +
> +	if (!conn_state)
> +		return;
> +
> +	if (!conn_state->writeback_job || !conn_state->writeback_job->fb) {
> +		output->writeback_status = WB_STOP;
> +		DRM_DEBUG_DRIVER("Disable writeback\n");
> +		return;
> +	}
> +
> +	drm_for_each_plane(plane, &vkmsdev->drm) {
> +		struct vkms_plane_state *vplane_state;
> +		struct vkms_crc_data *plane_data;
> +
> +		vplane_state = to_vkms_plane_state(plane->state);
> +		plane_data = vplane_state->crc_data;
> +
> +		if (drm_framebuffer_read_refcount(&plane_data->fb) == 0)
> +			continue;
> +
> +		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
> +			primary_data = plane_data;
> +	}
> +
> +	if (!primary_data)
> +		return;
> +
> +	fb = &primary_data->fb;
> +	gem_obj = drm_gem_fb_get_obj(fb, 0);
> +	vkms_obj = drm_gem_to_vkms_gem(gem_obj);
> +
> +	if (!vkms_obj->vaddr || !priv_data)
> +		return;
> +
> +	memcpy(priv_data, vkms_obj->vaddr, vkms_obj->gem.size);
> +	drm_writeback_queue_job(wb_conn, state);
> +	output->writeback_status = WB_START;

Hm, if this passes the current writeback tests then I guess those tests
are a bit too simple. Or maybe the test can't use the cursor plane, and
that's why it doesn't notice that we only write back the primary plane.

Writeback is supposed to write back the same image you'd see on the
screen, i.e. with cursor, other planes, any color correction applied and
anything else really. That means vkms writeback needs to be integrated
into the crc computation. We need to run that work either when there's a
writeback job or when we need a crc. Crc would be only computed when
needed, and for writeback we need to put the entire composited/blended
buffer into the writeback buffer.

That's why I said yesterday that your work will conflict with my work to
reorg crc work handling, aside from the final step it needs to do all the
same things.

I guess would be good to improve igt and add a cursor testcase for write
(similar to the crc cursor tests we have), or maybe create support in igt
to use writeback instead of crc, so that we could better check this.
-Daniel

> +}
> +
> +static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
> +	.get_modes = vkms_wb_connector_get_modes,
> +	.prepare_writeback_job = vkms_wb_prepare_job,
> +	.cleanup_writeback_job = vkms_wb_cleanup_job,
> +	.atomic_commit = vkms_wb_atomic_commit,
> +};
> +
> +int enable_writeback_connector(struct vkms_device *vkmsdev)
> +{
> +	struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
> +
> +	vkmsdev->output.wb_connector.encoder.possible_crtcs = 1;
> +	drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
> +
> +	return drm_writeback_connector_init(&vkmsdev->drm, wb,
> +					    &vkms_wb_connector_funcs,
> +					    &vkms_wb_encoder_helper_funcs,
> +					    vkms_formats,
> +					    ARRAY_SIZE(vkms_formats));
> +}
> +
> -- 
> 2.21.0



-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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