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Date:   Thu, 11 Jul 2019 10:10:25 +0200
From:   Daniel Vetter <daniel@ffwll.ch>
To:     Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Cc:     Brian Starkey <brian.starkey@arm.com>,
        Liviu Dudau <liviu.dudau@arm.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Haneen Mohammed <hamohammed.sa@gmail.com>,
        Simon Ser <contact@emersion.fr>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V3 2/5] drm/vkms: Rename vkms_crc.c into vkms_composer.c
Message-ID: <20190711081025.GG15868@phenom.ffwll.local>
Mail-Followup-To: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>,
        Brian Starkey <brian.starkey@arm.com>,
        Liviu Dudau <liviu.dudau@arm.com>,
        Haneen Mohammed <hamohammed.sa@gmail.com>,
        Simon Ser <contact@emersion.fr>, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org
References: <cover.1561491964.git.rodrigosiqueiramelo@gmail.com>
 <dea62063077ebf5cc1dfce8876e56788d15367e6.1561491964.git.rodrigosiqueiramelo@gmail.com>
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On Tue, Jun 25, 2019 at 10:37:05PM -0300, Rodrigo Siqueira wrote:
> As a preparation work for introducing writeback to vkms, this patch
> renames the file vkms_crc.c into vkms_composer.c. Accordingly, it also
> adjusts the functions and data structures to match the changes.
> 
> No functional change.
> 
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Too lazy to check it still compiles :-)
-Daniel


> ---
>  drivers/gpu/drm/vkms/Makefile                 |  2 +-
>  .../drm/vkms/{vkms_crc.c => vkms_composer.c}  | 98 ++++++++++---------
>  drivers/gpu/drm/vkms/vkms_crtc.c              | 30 +++---
>  drivers/gpu/drm/vkms/vkms_drv.c               |  4 +-
>  drivers/gpu/drm/vkms/vkms_drv.h               | 28 +++---
>  drivers/gpu/drm/vkms/vkms_plane.c             | 36 +++----
>  6 files changed, 101 insertions(+), 97 deletions(-)
>  rename drivers/gpu/drm/vkms/{vkms_crc.c => vkms_composer.c} (65%)
> 
> diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile
> index 89f09bec7b23..0b767d7efa24 100644
> --- a/drivers/gpu/drm/vkms/Makefile
> +++ b/drivers/gpu/drm/vkms/Makefile
> @@ -1,4 +1,4 @@
>  # 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_composer.o
>  
>  obj-$(CONFIG_DRM_VKMS) += vkms.o
> diff --git a/drivers/gpu/drm/vkms/vkms_crc.c b/drivers/gpu/drm/vkms/vkms_composer.c
> similarity index 65%
> rename from drivers/gpu/drm/vkms/vkms_crc.c
> rename to drivers/gpu/drm/vkms/vkms_composer.c
> index 30b048b67a32..eb7ea8be1f98 100644
> --- a/drivers/gpu/drm/vkms/vkms_crc.c
> +++ b/drivers/gpu/drm/vkms/vkms_composer.c
> @@ -10,25 +10,25 @@
>   * compute_crc - Compute CRC value on output frame
>   *
>   * @vaddr_out: address to final framebuffer
> - * @crc_out: framebuffer's metadata
> + * @composer: framebuffer's metadata
>   *
>   * returns CRC value computed using crc32 on the visible portion of
>   * the final framebuffer at vaddr_out
>   */
> -static uint32_t compute_crc(void *vaddr_out, struct vkms_crc_data *crc_out)
> +static uint32_t compute_crc(void *vaddr_out, struct vkms_composer *composer)
>  {
>  	int i, j, src_offset;
> -	int x_src = crc_out->src.x1 >> 16;
> -	int y_src = crc_out->src.y1 >> 16;
> -	int h_src = drm_rect_height(&crc_out->src) >> 16;
> -	int w_src = drm_rect_width(&crc_out->src) >> 16;
> +	int x_src = composer->src.x1 >> 16;
> +	int y_src = composer->src.y1 >> 16;
> +	int h_src = drm_rect_height(&composer->src) >> 16;
> +	int w_src = drm_rect_width(&composer->src) >> 16;
>  	u32 crc = 0;
>  
>  	for (i = y_src; i < y_src + h_src; ++i) {
>  		for (j = x_src; j < x_src + w_src; ++j) {
> -			src_offset = crc_out->offset
> -				     + (i * crc_out->pitch)
> -				     + (j * crc_out->cpp);
> +			src_offset = composer->offset
> +				     + (i * composer->pitch)
> +				     + (j * composer->cpp);
>  			/* XRGB format ignores Alpha channel */
>  			memset(vaddr_out + src_offset + 24, 0,  8);
>  			crc = crc32_le(crc, vaddr_out + src_offset,
> @@ -43,8 +43,8 @@ static uint32_t compute_crc(void *vaddr_out, struct vkms_crc_data *crc_out)
>   * blend - belnd value at vaddr_src with value at vaddr_dst
>   * @vaddr_dst: destination address
>   * @vaddr_src: source address
> - * @crc_dst: destination framebuffer's metadata
> - * @crc_src: source framebuffer's metadata
> + * @dest_composer: destination framebuffer's metadata
> + * @src_composer: source framebuffer's metadata
>   *
>   * Blend value at vaddr_src with value at vaddr_dst.
>   * Currently, this function write value at vaddr_src on value
> @@ -55,31 +55,31 @@ static uint32_t compute_crc(void *vaddr_out, struct vkms_crc_data *crc_out)
>   *	 instead of overwriting it.
>   */
>  static void blend(void *vaddr_dst, void *vaddr_src,
> -		  struct vkms_crc_data *crc_dst,
> -		  struct vkms_crc_data *crc_src)
> +		  struct vkms_composer *dest_composer,
> +		  struct vkms_composer *src_composer)
>  {
>  	int i, j, j_dst, i_dst;
>  	int offset_src, offset_dst;
>  
> -	int x_src = crc_src->src.x1 >> 16;
> -	int y_src = crc_src->src.y1 >> 16;
> +	int x_src = src_composer->src.x1 >> 16;
> +	int y_src = src_composer->src.y1 >> 16;
>  
> -	int x_dst = crc_src->dst.x1;
> -	int y_dst = crc_src->dst.y1;
> -	int h_dst = drm_rect_height(&crc_src->dst);
> -	int w_dst = drm_rect_width(&crc_src->dst);
> +	int x_dst = src_composer->dst.x1;
> +	int y_dst = src_composer->dst.y1;
> +	int h_dst = drm_rect_height(&src_composer->dst);
> +	int w_dst = drm_rect_width(&src_composer->dst);
>  
>  	int y_limit = y_src + h_dst;
>  	int x_limit = x_src + w_dst;
>  
>  	for (i = y_src, i_dst = y_dst; i < y_limit; ++i) {
>  		for (j = x_src, j_dst = x_dst; j < x_limit; ++j) {
> -			offset_dst = crc_dst->offset
> -				     + (i_dst * crc_dst->pitch)
> -				     + (j_dst++ * crc_dst->cpp);
> -			offset_src = crc_src->offset
> -				     + (i * crc_src->pitch)
> -				     + (j * crc_src->cpp);
> +			offset_dst = dest_composer->offset
> +				     + (i_dst * dest_composer->pitch)
> +				     + (j_dst++ * dest_composer->cpp);
> +			offset_src = src_composer->offset
> +				     + (i * src_composer->pitch)
> +				     + (j * src_composer->cpp);
>  
>  			memcpy(vaddr_dst + offset_dst,
>  			       vaddr_src + offset_src, sizeof(u32));
> @@ -88,25 +88,27 @@ static void blend(void *vaddr_dst, void *vaddr_src,
>  	}
>  }
>  
> -static void compose_cursor(struct vkms_crc_data *cursor_crc,
> -			   struct vkms_crc_data *primary_crc, void *vaddr_out)
> +static void compose_cursor(struct vkms_composer *cursor_composer,
> +			   struct vkms_composer *primary_composer,
> +			   void *vaddr_out)
>  {
>  	struct drm_gem_object *cursor_obj;
>  	struct vkms_gem_object *cursor_vkms_obj;
>  
> -	cursor_obj = drm_gem_fb_get_obj(&cursor_crc->fb, 0);
> +	cursor_obj = drm_gem_fb_get_obj(&cursor_composer->fb, 0);
>  	cursor_vkms_obj = drm_gem_to_vkms_gem(cursor_obj);
>  
>  	if (WARN_ON(!cursor_vkms_obj->vaddr))
>  		return;
>  
> -	blend(vaddr_out, cursor_vkms_obj->vaddr, primary_crc, cursor_crc);
> +	blend(vaddr_out, cursor_vkms_obj->vaddr,
> +	      primary_composer, cursor_composer);
>  }
>  
> -static uint32_t _vkms_get_crc(struct vkms_crc_data *primary_crc,
> -			      struct vkms_crc_data *cursor_crc)
> +static uint32_t _vkms_get_crc(struct vkms_composer *primary_composer,
> +			      struct vkms_composer *cursor_composer)
>  {
> -	struct drm_framebuffer *fb = &primary_crc->fb;
> +	struct drm_framebuffer *fb = &primary_composer->fb;
>  	struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0);
>  	struct vkms_gem_object *vkms_obj = drm_gem_to_vkms_gem(gem_obj);
>  	void *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL);
> @@ -124,10 +126,10 @@ static uint32_t _vkms_get_crc(struct vkms_crc_data *primary_crc,
>  
>  	memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size);
>  
> -	if (cursor_crc)
> -		compose_cursor(cursor_crc, primary_crc, vaddr_out);
> +	if (cursor_composer)
> +		compose_cursor(cursor_composer, primary_composer, vaddr_out);
>  
> -	crc = compute_crc(vaddr_out, primary_crc);
> +	crc = compute_crc(vaddr_out, primary_composer);
>  
>  	kfree(vaddr_out);
>  
> @@ -135,35 +137,35 @@ static uint32_t _vkms_get_crc(struct vkms_crc_data *primary_crc,
>  }
>  
>  /**
> - * vkms_crc_work_handle - ordered work_struct to compute CRC
> + * vkms_composer_worker - ordered work_struct to compute CRC
>   *
>   * @work: work_struct
>   *
> - * Work handler for computing CRCs. work_struct scheduled in
> + * Work handler for composing and computing CRCs. work_struct scheduled in
>   * an ordered workqueue that's periodically scheduled to run by
>   * _vblank_handle() and flushed at vkms_atomic_crtc_destroy_state().
>   */
> -void vkms_crc_work_handle(struct work_struct *work)
> +void vkms_composer_worker(struct work_struct *work)
>  {
>  	struct vkms_crtc_state *crtc_state = container_of(work,
>  						struct vkms_crtc_state,
> -						crc_work);
> +						composer_work);
>  	struct drm_crtc *crtc = crtc_state->base.crtc;
>  	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
> -	struct vkms_crc_data *primary_crc = NULL;
> -	struct vkms_crc_data *cursor_crc = NULL;
> +	struct vkms_composer *primary_composer = NULL;
> +	struct vkms_composer *cursor_composer = NULL;
>  	u32 crc32 = 0;
>  	u64 frame_start, frame_end;
>  	bool crc_pending;
>  
> -	spin_lock_irq(&out->crc_lock);
> +	spin_lock_irq(&out->composer_lock);
>  	frame_start = crtc_state->frame_start;
>  	frame_end = crtc_state->frame_end;
>  	crc_pending = crtc_state->crc_pending;
>  	crtc_state->frame_start = 0;
>  	crtc_state->frame_end = 0;
>  	crtc_state->crc_pending = false;
> -	spin_unlock_irq(&out->crc_lock);
> +	spin_unlock_irq(&out->composer_lock);
>  
>  	/*
>  	 * We raced with the vblank hrtimer and previous work already computed
> @@ -173,13 +175,13 @@ void vkms_crc_work_handle(struct work_struct *work)
>  		return;
>  
>  	if (crtc_state->num_active_planes >= 1)
> -		primary_crc = crtc_state->active_planes[0]->crc_data;
> +		primary_composer = crtc_state->active_planes[0]->composer;
>  
>  	if (crtc_state->num_active_planes == 2)
> -		cursor_crc = crtc_state->active_planes[1]->crc_data;
> +		cursor_composer = crtc_state->active_planes[1]->composer;
>  
> -	if (primary_crc)
> -		crc32 = _vkms_get_crc(primary_crc, cursor_crc);
> +	if (primary_composer)
> +		crc32 = _vkms_get_crc(primary_composer, cursor_composer);
>  
>  	/*
>  	 * The worker can fall behind the vblank hrtimer, make sure we catch up.
> @@ -237,7 +239,7 @@ int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name)
>  	ret = vkms_crc_parse_source(src_name, &enabled);
>  
>  	spin_lock_irq(&out->lock);
> -	out->crc_enabled = enabled;
> +	out->composer_enabled = enabled;
>  	spin_unlock_irq(&out->lock);
>  
>  	return ret;
> diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
> index a648892379c3..04c6f4250dea 100644
> --- a/drivers/gpu/drm/vkms/vkms_crtc.c
> +++ b/drivers/gpu/drm/vkms/vkms_crtc.c
> @@ -24,14 +24,14 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
>  	if (!ret)
>  		DRM_ERROR("vkms failure on handling vblank");
>  
> -	state = output->crc_state;
> -	if (state && output->crc_enabled) {
> +	state = output->composer_state;
> +	if (state && output->composer_enabled) {
>  		u64 frame = drm_crtc_accurate_vblank_count(crtc);
>  
> -		/* update frame_start only if a queued vkms_crc_work_handle()
> +		/* update frame_start only if a queued vkms_composer_worker()
>  		 * has read the data
>  		 */
> -		spin_lock(&output->crc_lock);
> +		spin_lock(&output->composer_lock);
>  		if (!state->crc_pending)
>  			state->frame_start = frame;
>  		else
> @@ -39,11 +39,11 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
>  					 state->frame_start, frame);
>  		state->frame_end = frame;
>  		state->crc_pending = true;
> -		spin_unlock(&output->crc_lock);
> +		spin_unlock(&output->composer_lock);
>  
> -		ret = queue_work(output->crc_workq, &state->crc_work);
> +		ret = queue_work(output->composer_workq, &state->composer_work);
>  		if (!ret)
> -			DRM_DEBUG_DRIVER("vkms_crc_work_handle already queued\n");
> +			DRM_DEBUG_DRIVER("Composer worker already queued\n");
>  	}
>  
>  	spin_unlock(&output->lock);
> @@ -114,7 +114,7 @@ vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc)
>  
>  	__drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base);
>  
> -	INIT_WORK(&vkms_state->crc_work, vkms_crc_work_handle);
> +	INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
>  
>  	return &vkms_state->base;
>  }
> @@ -126,7 +126,7 @@ static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
>  
>  	__drm_atomic_helper_crtc_destroy_state(state);
>  
> -	WARN_ON(work_pending(&vkms_state->crc_work));
> +	WARN_ON(work_pending(&vkms_state->composer_work));
>  	kfree(vkms_state->active_planes);
>  	kfree(vkms_state);
>  }
> @@ -141,7 +141,7 @@ static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
>  
>  	__drm_atomic_helper_crtc_reset(crtc, &vkms_state->base);
>  	if (vkms_state)
> -		INIT_WORK(&vkms_state->crc_work, vkms_crc_work_handle);
> +		INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
>  }
>  
>  static const struct drm_crtc_funcs vkms_crtc_funcs = {
> @@ -222,7 +222,7 @@ static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
>  	struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
>  
>  	/* This lock is held across the atomic commit to block vblank timer
> -	 * from scheduling vkms_crc_work_handle until the crc_data is updated
> +	 * from scheduling vkms_composer_worker until the composer is updated
>  	 */
>  	spin_lock_irq(&vkms_output->lock);
>  }
> @@ -245,7 +245,7 @@ static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
>  		crtc->state->event = NULL;
>  	}
>  
> -	vkms_output->crc_state = to_vkms_crtc_state(crtc->state);
> +	vkms_output->composer_state = to_vkms_crtc_state(crtc->state);
>  
>  	spin_unlock_irq(&vkms_output->lock);
>  }
> @@ -274,10 +274,10 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
>  	drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
>  
>  	spin_lock_init(&vkms_out->lock);
> -	spin_lock_init(&vkms_out->crc_lock);
> +	spin_lock_init(&vkms_out->composer_lock);
>  
> -	vkms_out->crc_workq = alloc_ordered_workqueue("vkms_crc_workq", 0);
> -	if (!vkms_out->crc_workq)
> +	vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0);
> +	if (!vkms_out->composer_workq)
>  		return -ENOMEM;
>  
>  	return ret;
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> index 966b3d653189..ac790b6527e4 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.c
> +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> @@ -56,7 +56,7 @@ static void vkms_release(struct drm_device *dev)
>  	drm_atomic_helper_shutdown(&vkms->drm);
>  	drm_mode_config_cleanup(&vkms->drm);
>  	drm_dev_fini(&vkms->drm);
> -	destroy_workqueue(vkms->output.crc_workq);
> +	destroy_workqueue(vkms->output.composer_workq);
>  }
>  
>  static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
> @@ -82,7 +82,7 @@ static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
>  		struct vkms_crtc_state *vkms_state =
>  			to_vkms_crtc_state(old_crtc_state);
>  
> -		flush_work(&vkms_state->crc_work);
> +		flush_work(&vkms_state->composer_work);
>  	}
>  
>  	drm_atomic_helper_cleanup_planes(dev, old_state);
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index e2d1aa089dec..fc6cda164336 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -20,7 +20,7 @@
>  
>  extern bool enable_cursor;
>  
> -struct vkms_crc_data {
> +struct vkms_composer {
>  	struct drm_framebuffer fb;
>  	struct drm_rect src, dst;
>  	unsigned int offset;
> @@ -31,29 +31,29 @@ struct vkms_crc_data {
>  /**
>   * vkms_plane_state - Driver specific plane state
>   * @base: base plane state
> - * @crc_data: data required for CRC computation
> + * @composer: data required for composing computation
>   */
>  struct vkms_plane_state {
>  	struct drm_plane_state base;
> -	struct vkms_crc_data *crc_data;
> +	struct vkms_composer *composer;
>  };
>  
>  /**
>   * vkms_crtc_state - Driver specific CRTC state
>   * @base: base CRTC state
> - * @crc_work: work struct to compute and add CRC entries
> + * @composer_work: work struct to compose and add CRC entries
>   * @n_frame_start: start frame number for computed CRC
>   * @n_frame_end: end frame number for computed CRC
>   */
>  struct vkms_crtc_state {
>  	struct drm_crtc_state base;
> -	struct work_struct crc_work;
> +	struct work_struct composer_work;
>  
>  	int num_active_planes;
>  	/* stack of active planes for crc computation, should be in z order */
>  	struct vkms_plane_state **active_planes;
>  
> -	/* below three are protected by vkms_output.crc_lock */
> +	/* below three are protected by vkms_output.composer_lock */
>  	bool crc_pending;
>  	u64 frame_start;
>  	u64 frame_end;
> @@ -66,16 +66,16 @@ struct vkms_output {
>  	struct hrtimer vblank_hrtimer;
>  	ktime_t period_ns;
>  	struct drm_pending_vblank_event *event;
> -	/* ordered wq for crc_work */
> -	struct workqueue_struct *crc_workq;
> -	/* protects concurrent access to crc_data */
> +	/* ordered wq for composer_work */
> +	struct workqueue_struct *composer_workq;
> +	/* protects concurrent access to composer */
>  	spinlock_t lock;
>  
>  	/* protected by @lock */
> -	bool crc_enabled;
> -	struct vkms_crtc_state *crc_state;
> +	bool composer_enabled;
> +	struct vkms_crtc_state *composer_state;
>  
> -	spinlock_t crc_lock;
> +	spinlock_t composer_lock;
>  };
>  
>  struct vkms_device {
> @@ -143,6 +143,8 @@ const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
>  int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name);
>  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);
> +
> +/* Composer Support */
> +void vkms_composer_worker(struct work_struct *work);
>  
>  #endif /* _VKMS_DRV_H_ */
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index 18c630cfc485..8b60d3434d75 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -18,20 +18,20 @@ static struct drm_plane_state *
>  vkms_plane_duplicate_state(struct drm_plane *plane)
>  {
>  	struct vkms_plane_state *vkms_state;
> -	struct vkms_crc_data *crc_data;
> +	struct vkms_composer *composer;
>  
>  	vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
>  	if (!vkms_state)
>  		return NULL;
>  
> -	crc_data = kzalloc(sizeof(*crc_data), GFP_KERNEL);
> -	if (!crc_data) {
> -		DRM_DEBUG_KMS("Couldn't allocate crc_data\n");
> +	composer = kzalloc(sizeof(*composer), GFP_KERNEL);
> +	if (!composer) {
> +		DRM_DEBUG_KMS("Couldn't allocate composer\n");
>  		kfree(vkms_state);
>  		return NULL;
>  	}
>  
> -	vkms_state->crc_data = crc_data;
> +	vkms_state->composer = composer;
>  
>  	__drm_atomic_helper_plane_duplicate_state(plane,
>  						  &vkms_state->base);
> @@ -49,12 +49,12 @@ static void vkms_plane_destroy_state(struct drm_plane *plane,
>  		/* dropping the reference we acquired in
>  		 * vkms_primary_plane_update()
>  		 */
> -		if (drm_framebuffer_read_refcount(&vkms_state->crc_data->fb))
> -			drm_framebuffer_put(&vkms_state->crc_data->fb);
> +		if (drm_framebuffer_read_refcount(&vkms_state->composer->fb))
> +			drm_framebuffer_put(&vkms_state->composer->fb);
>  	}
>  
> -	kfree(vkms_state->crc_data);
> -	vkms_state->crc_data = NULL;
> +	kfree(vkms_state->composer);
> +	vkms_state->composer = NULL;
>  
>  	__drm_atomic_helper_plane_destroy_state(old_state);
>  	kfree(vkms_state);
> @@ -91,21 +91,21 @@ static void vkms_plane_atomic_update(struct drm_plane *plane,
>  {
>  	struct vkms_plane_state *vkms_plane_state;
>  	struct drm_framebuffer *fb = plane->state->fb;
> -	struct vkms_crc_data *crc_data;
> +	struct vkms_composer *composer;
>  
>  	if (!plane->state->crtc || !fb)
>  		return;
>  
>  	vkms_plane_state = to_vkms_plane_state(plane->state);
>  
> -	crc_data = vkms_plane_state->crc_data;
> -	memcpy(&crc_data->src, &plane->state->src, sizeof(struct drm_rect));
> -	memcpy(&crc_data->dst, &plane->state->dst, sizeof(struct drm_rect));
> -	memcpy(&crc_data->fb, fb, sizeof(struct drm_framebuffer));
> -	drm_framebuffer_get(&crc_data->fb);
> -	crc_data->offset = fb->offsets[0];
> -	crc_data->pitch = fb->pitches[0];
> -	crc_data->cpp = fb->format->cpp[0];
> +	composer = vkms_plane_state->composer;
> +	memcpy(&composer->src, &plane->state->src, sizeof(struct drm_rect));
> +	memcpy(&composer->dst, &plane->state->dst, sizeof(struct drm_rect));
> +	memcpy(&composer->fb, fb, sizeof(struct drm_framebuffer));
> +	drm_framebuffer_get(&composer->fb);
> +	composer->offset = fb->offsets[0];
> +	composer->pitch = fb->pitches[0];
> +	composer->cpp = fb->format->cpp[0];
>  }
>  
>  static int vkms_plane_atomic_check(struct drm_plane *plane,
> -- 
> 2.21.0
> 

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