// SPDX-License-Identifier: MIT #include <linux/export.h>#include <linux/moduleparam.h>#include <linux/vmalloc.h> #include <drm/drm_crtc_helper.h>#include <drm/drm_drv.h>#include <drm/drm_fb_helper.h>#include <drm/drm_framebuffer.h>#include <drm/drm_gem.h>#include <drm/drm_print.h> #include <drm/drm_fbdev_ttm.h> /* @user: 1=userspace, 0=fbcon */static int drm_fbdev_ttm_fb_open(struct fb_info *info, int user){	struct drm_fb_helper *fb_helper = info->par; 	/* No need to take a ref for fbcon because it unbinds on unregister */	if (user && !try_module_get(fb_helper->dev->driver->fops->owner))		return -ENODEV; 	return 0;} static int drm_fbdev_ttm_fb_release(struct fb_info *info, int user){	struct drm_fb_helper *fb_helper = info->par; 	if (user)		module_put(fb_helper->dev->driver->fops->owner); 	return 0;} FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(drm_fbdev_ttm,				   drm_fb_helper_damage_range,				   drm_fb_helper_damage_area); static void drm_fbdev_ttm_fb_destroy(struct fb_info *info){	struct drm_fb_helper *fb_helper = info->par;	void *shadow = info->screen_buffer; 	if (!fb_helper->dev)		return; 	fb_deferred_io_cleanup(info);	drm_fb_helper_fini(fb_helper);	vfree(shadow);	drm_client_buffer_delete(fb_helper->buffer); 	drm_client_release(&fb_helper->client);} static const struct fb_ops drm_fbdev_ttm_fb_ops = {	.owner		= THIS_MODULE,	.fb_open	= drm_fbdev_ttm_fb_open,	.fb_release	= drm_fbdev_ttm_fb_release,	FB_DEFAULT_DEFERRED_OPS(drm_fbdev_ttm),	DRM_FB_HELPER_DEFAULT_OPS,	.fb_destroy	= drm_fbdev_ttm_fb_destroy,}; static void drm_fbdev_ttm_damage_blit_real(struct drm_fb_helper *fb_helper,					   struct drm_clip_rect *clip,					   struct iosys_map *dst){	struct drm_framebuffer *fb = fb_helper->fb;	size_t offset = clip->y1 * fb->pitches[0];	size_t len = clip->x2 - clip->x1;	unsigned int y;	void *src; 	switch (drm_format_info_bpp(fb->format, 0)) {	case 1:		offset += clip->x1 / 8;		len = DIV_ROUND_UP(len + clip->x1 % 8, 8);		break;	case 2:		offset += clip->x1 / 4;		len = DIV_ROUND_UP(len + clip->x1 % 4, 4);		break;	case 4:		offset += clip->x1 / 2;		len = DIV_ROUND_UP(len + clip->x1 % 2, 2);		break;	default:		offset += clip->x1 * fb->format->cpp[0];		len *= fb->format->cpp[0];		break;	} 	src = fb_helper->info->screen_buffer + offset;	iosys_map_incr(dst, offset); /* go to first pixel within clip rect */ 	for (y = clip->y1; y < clip->y2; y++) {		iosys_map_memcpy_to(dst, 0, src, len);		iosys_map_incr(dst, fb->pitches[0]);		src += fb->pitches[0];	}} static int drm_fbdev_ttm_damage_blit(struct drm_fb_helper *fb_helper,				     struct drm_clip_rect *clip){	struct drm_client_buffer *buffer = fb_helper->buffer;	struct iosys_map map, dst;	int ret; 	/*	 * We have to pin the client buffer to its current location while	 * flushing the shadow buffer. In the general case, concurrent	 * modesetting operations could try to move the buffer and would	 * fail. The modeset has to be serialized by acquiring the reservation	 * object of the underlying BO here.	 *	 * For fbdev emulation, we only have to protect against fbdev modeset	 * operations. Nothing else will involve the client buffer's BO. So it	 * is sufficient to acquire struct drm_fb_helper.lock here.	 */	mutex_lock(&fb_helper->lock); 	ret = drm_client_buffer_vmap_local(buffer, &map);	if (ret)		goto out; 	dst = map;	drm_fbdev_ttm_damage_blit_real(fb_helper, clip, &dst); 	drm_client_buffer_vunmap_local(buffer); out:	mutex_unlock(&fb_helper->lock); 	return ret;} static int drm_fbdev_ttm_helper_fb_dirty(struct drm_fb_helper *helper,					 struct drm_clip_rect *clip){	struct drm_device *dev = helper->dev;	int ret; 	/* Call damage handlers only if necessary */	if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))		return 0; 	ret = drm_fbdev_ttm_damage_blit(helper, clip);	if (drm_WARN_ONCE(dev, ret, "Damage blitter failed: ret=%d\n", ret))		return ret; 	if (helper->fb->funcs->dirty) {		ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);		if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))			return ret;	} 	return 0;} static const struct drm_fb_helper_funcs drm_fbdev_ttm_helper_funcs = {	.fb_dirty = drm_fbdev_ttm_helper_fb_dirty,}; /* * struct drm_driver */ int drm_fbdev_ttm_driver_fbdev_probe(struct drm_fb_helper *fb_helper,				     struct drm_fb_helper_surface_size *sizes){	struct drm_client_dev *client = &fb_helper->client;	struct drm_device *dev = fb_helper->dev;	struct fb_info *info = fb_helper->info;	struct drm_client_buffer *buffer;	size_t screen_size;	void *screen_buffer;	u32 format;	int ret; 	drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n",		    sizes->surface_width, sizes->surface_height,		    sizes->surface_bpp); 	format = drm_driver_legacy_fb_format(dev, sizes->surface_bpp,					     sizes->surface_depth);	buffer = drm_client_buffer_create_dumb(client, sizes->surface_width,					       sizes->surface_height, format);	if (IS_ERR(buffer))		return PTR_ERR(buffer); 	fb_helper->funcs = &drm_fbdev_ttm_helper_funcs;	fb_helper->buffer = buffer;	fb_helper->fb = buffer->fb; 	screen_size = buffer->gem->size;	screen_buffer = vzalloc(screen_size);	if (!screen_buffer) {		ret = -ENOMEM;		goto err_drm_client_buffer_delete;	} 	drm_fb_helper_fill_info(info, fb_helper, sizes); 	info->fbops = &drm_fbdev_ttm_fb_ops; 	/* screen */	info->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST;	info->screen_buffer = screen_buffer;	info->fix.smem_len = screen_size; 	/* deferred I/O */	fb_helper->fbdefio.delay = HZ / 20;	fb_helper->fbdefio.deferred_io = drm_fb_helper_deferred_io; 	info->fbdefio = &fb_helper->fbdefio;	ret = fb_deferred_io_init(info);	if (ret)		goto err_vfree; 	return 0; err_vfree:	vfree(screen_buffer);err_drm_client_buffer_delete:	fb_helper->fb = NULL;	fb_helper->buffer = NULL;	drm_client_buffer_delete(buffer);	return ret;}EXPORT_SYMBOL(drm_fbdev_ttm_driver_fbdev_probe);