drivers/gpu/drm/vkms/vkms_composer.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+

 #include <linux/crc32.h>

 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_vblank.h>

 #include "vkms_drv.h"

 /**
  * compute_crc - Compute CRC value on output frame
  *
  * @vaddr_out: address to final framebuffer
  * @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_composer *composer)
 {
 	int i, j, src_offset;
 	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 = 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,
 				       sizeof(u32));
 		}
 	}

 	return crc;
 }

 /**
  * blend - blend value at vaddr_src with value at vaddr_dst
  * @vaddr_dst: destination address
  * @vaddr_src: source address
  * @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 of vaddr_src on value
  * at vaddr_dst using buffer's metadata to locate the new values
  * from vaddr_src and their destination at vaddr_dst.
  *
  * TODO: Use the alpha value to blend vaddr_src with vaddr_dst
  *	 instead of overwriting it.
  */
 static void blend(void *vaddr_dst, void *vaddr_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 = src_composer->src.x1 >> 16;
 	int y_src = src_composer->src.y1 >> 16;

 	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 = 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));
 		}
 		i_dst++;
 	}
 }

 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_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_composer, cursor_composer);
 }

 static uint32_t _vkms_get_crc(struct vkms_composer *primary_composer,
 			      struct vkms_composer *cursor_composer)
 {
 	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);
 	u32 crc = 0;

 	if (!vaddr_out) {
 		DRM_ERROR("Failed to allocate memory for output frame.");
 		return 0;
 	}

 	if (WARN_ON(!vkms_obj->vaddr)) {
 		kfree(vaddr_out);
 		return crc;
 	}

 	memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size);

 	if (cursor_composer)
 		compose_cursor(cursor_composer, primary_composer, vaddr_out);

 	crc = compute_crc(vaddr_out, primary_composer);

 	kfree(vaddr_out);

 	return crc;
 }

 /**
  * vkms_composer_worker - ordered work_struct to compute CRC
  *
  * @work: work_struct
  *
  * 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_composer_worker(struct work_struct *work)
 {
 	struct vkms_crtc_state *crtc_state = container_of(work,
 						struct vkms_crtc_state,
 						composer_work);
 	struct drm_crtc *crtc = crtc_state->base.crtc;
 	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
 	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->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->composer_lock);

 	/*
 	 * We raced with the vblank hrtimer and previous work already computed
 	 * the crc, nothing to do.
 	 */
 	if (!crc_pending)
 		return;

 	if (crtc_state->num_active_planes >= 1)
 		primary_composer = crtc_state->active_planes[0]->composer;

 	if (crtc_state->num_active_planes == 2)
 		cursor_composer = crtc_state->active_planes[1]->composer;

 	if (primary_composer)
 		crc32 = _vkms_get_crc(primary_composer, cursor_composer);

 	/*
 	 * The worker can fall behind the vblank hrtimer, make sure we catch up.
 	 */
 	while (frame_start <= frame_end)
 		drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32);
 }

 static const char * const pipe_crc_sources[] = {"auto"};

 const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
 					size_t *count)
 {
 	*count = ARRAY_SIZE(pipe_crc_sources);
 	return pipe_crc_sources;
 }

 static int vkms_crc_parse_source(const char *src_name, bool *enabled)
 {
 	int ret = 0;

 	if (!src_name) {
 		*enabled = false;
 	} else if (strcmp(src_name, "auto") == 0) {
 		*enabled = true;
 	} else {
 		*enabled = false;
 		ret = -EINVAL;
 	}

 	return ret;
 }

 int vkms_verify_crc_source(struct drm_crtc *crtc, const char *src_name,
 			   size_t *values_cnt)
 {
 	bool enabled;

 	if (vkms_crc_parse_source(src_name, &enabled) < 0) {
 		DRM_DEBUG_DRIVER("unknown source %s\n", src_name);
 		return -EINVAL;
 	}

 	*values_cnt = 1;

 	return 0;
 }

 int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name)
 {
 	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
 	bool enabled = false;
 	int ret = 0;

 	ret = vkms_crc_parse_source(src_name, &enabled);

 	spin_lock_irq(&out->lock);
 	out->composer_enabled = enabled;
 	spin_unlock_irq(&out->lock);

 	return ret;
 }
	// SPDX-License-Identifier: GPL-2.0+

	#include <linux/crc32.h>

	#include <drm/drm_atomic.h>
	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_gem_framebuffer_helper.h>
	#include <drm/drm_vblank.h>

	#include "vkms_drv.h"

	/**
	* compute_crc - Compute CRC value on output frame
	*
	* @vaddr_out: address to final framebuffer
	* @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_composer composer)
	{
	int i, j, src_offset;
	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 = 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,
	sizeof(u32));
	}
	}

	return crc;
	}

	/**
	* blend - blend value at vaddr_src with value at vaddr_dst
	* @vaddr_dst: destination address
	* @vaddr_src: source address
	* @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 of vaddr_src on value
	* at vaddr_dst using buffer's metadata to locate the new values
	* from vaddr_src and their destination at vaddr_dst.
	*
	* TODO: Use the alpha value to blend vaddr_src with vaddr_dst
	* instead of overwriting it.
	*/
	static void blend(void vaddr_dst, void vaddr_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 = src_composer->src.x1 >> 16;
	int y_src = src_composer->src.y1 >> 16;

	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 = 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));
	}
	i_dst++;
	}
	}

	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_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_composer, cursor_composer);
	}

	static uint32_t _vkms_get_crc(struct vkms_composer *primary_composer,
	struct vkms_composer *cursor_composer)
	{
	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);
	u32 crc = 0;

	if (!vaddr_out) {
	DRM_ERROR("Failed to allocate memory for output frame.");
	return 0;
	}

	if (WARN_ON(!vkms_obj->vaddr)) {
	kfree(vaddr_out);
	return crc;
	}

	memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size);

	if (cursor_composer)
	compose_cursor(cursor_composer, primary_composer, vaddr_out);

	crc = compute_crc(vaddr_out, primary_composer);

	kfree(vaddr_out);

	return crc;
	}

	/**
	* vkms_composer_worker - ordered work_struct to compute CRC
	*
	* @work: work_struct
	*
	* 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_composer_worker(struct work_struct *work)
	{
	struct vkms_crtc_state *crtc_state = container_of(work,
	struct vkms_crtc_state,
	composer_work);
	struct drm_crtc *crtc = crtc_state->base.crtc;
	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
	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->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->composer_lock);

	/*
	* We raced with the vblank hrtimer and previous work already computed
	* the crc, nothing to do.
	*/
	if (!crc_pending)
	return;

	if (crtc_state->num_active_planes >= 1)
	primary_composer = crtc_state->active_planes[0]->composer;

	if (crtc_state->num_active_planes == 2)
	cursor_composer = crtc_state->active_planes[1]->composer;

	if (primary_composer)
	crc32 = _vkms_get_crc(primary_composer, cursor_composer);

	/*
	* The worker can fall behind the vblank hrtimer, make sure we catch up.
	*/
	while (frame_start <= frame_end)
	drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32);
	}

	static const char * const pipe_crc_sources[] = {"auto"};

	const char const vkms_get_crc_sources(struct drm_crtc *crtc,
	size_t *count)
	{
	*count = ARRAY_SIZE(pipe_crc_sources);
	return pipe_crc_sources;
	}

	static int vkms_crc_parse_source(const char src_name, bool enabled)
	{
	int ret = 0;

	if (!src_name) {
	*enabled = false;
	} else if (strcmp(src_name, "auto") == 0) {
	*enabled = true;
	} else {
	*enabled = false;
	ret = -EINVAL;
	}

	return ret;
	}

	int vkms_verify_crc_source(struct drm_crtc crtc, const char src_name,
	size_t *values_cnt)
	{
	bool enabled;

	if (vkms_crc_parse_source(src_name, &enabled) < 0) {
	DRM_DEBUG_DRIVER("unknown source %s\n", src_name);
	return -EINVAL;
	}

	*values_cnt = 1;

	return 0;
	}

	int vkms_set_crc_source(struct drm_crtc crtc, const char src_name)
	{
	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
	bool enabled = false;
	int ret = 0;

	ret = vkms_crc_parse_source(src_name, &enabled);

	spin_lock_irq(&out->lock);
	out->composer_enabled = enabled;
	spin_unlock_irq(&out->lock);

	return ret;
	}