// SPDX-License-Identifier: MIT #include <linux/fb.h> #include <drm/drm_drv.h>#include <drm/drm_fbdev_dma.h>#include <drm/drm_fb_dma_helper.h>#include <drm/drm_fb_helper.h>#include <drm/drm_framebuffer.h>#include <drm/drm_gem_dma_helper.h> /* * struct fb_ops */ static int drm_fbdev_dma_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_dma_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;} static int drm_fbdev_dma_fb_mmap(struct fb_info *info, struct vm_area_struct *vma){	struct drm_fb_helper *fb_helper = info->par; 	return drm_gem_prime_mmap(fb_helper->buffer->gem, vma);} static void drm_fbdev_dma_fb_destroy(struct fb_info *info){	struct drm_fb_helper *fb_helper = info->par; 	if (!fb_helper->dev)		return; 	if (info->fbdefio)		fb_deferred_io_cleanup(info);	drm_fb_helper_fini(fb_helper); 	drm_client_buffer_vunmap(fb_helper->buffer);	drm_client_framebuffer_delete(fb_helper->buffer);	drm_client_release(&fb_helper->client);	drm_fb_helper_unprepare(fb_helper);	kfree(fb_helper);} static const struct fb_ops drm_fbdev_dma_fb_ops = {	.owner = THIS_MODULE,	.fb_open = drm_fbdev_dma_fb_open,	.fb_release = drm_fbdev_dma_fb_release,	__FB_DEFAULT_DMAMEM_OPS_RDWR,	DRM_FB_HELPER_DEFAULT_OPS,	__FB_DEFAULT_DMAMEM_OPS_DRAW,	.fb_mmap = drm_fbdev_dma_fb_mmap,	.fb_destroy = drm_fbdev_dma_fb_destroy,}; FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(drm_fbdev_dma,				   drm_fb_helper_damage_range,				   drm_fb_helper_damage_area); static int drm_fbdev_dma_deferred_fb_mmap(struct fb_info *info, struct vm_area_struct *vma){	struct drm_fb_helper *fb_helper = info->par;	struct drm_framebuffer *fb = fb_helper->fb;	struct drm_gem_dma_object *dma = drm_fb_dma_get_gem_obj(fb, 0); 	if (!dma->map_noncoherent)		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); 	return fb_deferred_io_mmap(info, vma);} static const struct fb_ops drm_fbdev_dma_deferred_fb_ops = {	.owner = THIS_MODULE,	.fb_open = drm_fbdev_dma_fb_open,	.fb_release = drm_fbdev_dma_fb_release,	__FB_DEFAULT_DEFERRED_OPS_RDWR(drm_fbdev_dma),	DRM_FB_HELPER_DEFAULT_OPS,	__FB_DEFAULT_DEFERRED_OPS_DRAW(drm_fbdev_dma),	.fb_mmap = drm_fbdev_dma_deferred_fb_mmap,	.fb_destroy = drm_fbdev_dma_fb_destroy,}; /* * struct drm_fb_helper */ static int drm_fbdev_dma_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; 	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_dma_helper_funcs = {	.fb_dirty = drm_fbdev_dma_helper_fb_dirty,}; /* * struct drm_fb_helper */ int drm_fbdev_dma_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;	bool use_deferred_io = false;	struct drm_client_buffer *buffer;	struct drm_gem_dma_object *dma_obj;	struct drm_framebuffer *fb;	struct fb_info *info;	u32 format;	struct iosys_map map;	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_framebuffer_create(client, sizes->surface_width,					       sizes->surface_height, format);	if (IS_ERR(buffer))		return PTR_ERR(buffer);	dma_obj = to_drm_gem_dma_obj(buffer->gem); 	fb = buffer->fb; 	/*	 * Deferred I/O requires struct page for framebuffer memory,	 * which is not guaranteed for all DMA ranges. We thus only	 * install deferred I/O if we have a framebuffer that requires	 * it.	 */	if (fb->funcs->dirty)		use_deferred_io = true; 	ret = drm_client_buffer_vmap(buffer, &map);	if (ret) {		goto err_drm_client_buffer_delete;	} else if (drm_WARN_ON(dev, map.is_iomem)) {		ret = -ENODEV; /* I/O memory not supported; use generic emulation */		goto err_drm_client_buffer_delete;	} 	fb_helper->funcs = &drm_fbdev_dma_helper_funcs;	fb_helper->buffer = buffer;	fb_helper->fb = fb; 	info = drm_fb_helper_alloc_info(fb_helper);	if (IS_ERR(info)) {		ret = PTR_ERR(info);		goto err_drm_client_buffer_vunmap;	} 	drm_fb_helper_fill_info(info, fb_helper, sizes); 	if (use_deferred_io)		info->fbops = &drm_fbdev_dma_deferred_fb_ops;	else		info->fbops = &drm_fbdev_dma_fb_ops; 	/* screen */	info->flags |= FBINFO_VIRTFB; /* system memory */	if (dma_obj->map_noncoherent)		info->flags |= FBINFO_READS_FAST; /* signal caching */	info->screen_size = sizes->surface_height * fb->pitches[0];	info->screen_buffer = map.vaddr;	if (!(info->flags & FBINFO_HIDE_SMEM_START)) {		if (!drm_WARN_ON(dev, is_vmalloc_addr(info->screen_buffer)))			info->fix.smem_start = page_to_phys(virt_to_page(info->screen_buffer));	}	info->fix.smem_len = info->screen_size; 	/*	 * Only set up deferred I/O if the screen buffer supports	 * it. If this disagrees with the previous test for ->dirty,	 * mmap on the /dev/fb file might not work correctly.	 */	if (!is_vmalloc_addr(info->screen_buffer) && info->fix.smem_start) {		unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT; 		if (drm_WARN_ON(dev, !pfn_to_page(pfn)))			use_deferred_io = false;	} 	/* deferred I/O */	if (use_deferred_io) {		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_drm_fb_helper_release_info;	} 	return 0; err_drm_fb_helper_release_info:	drm_fb_helper_release_info(fb_helper);err_drm_client_buffer_vunmap:	fb_helper->fb = NULL;	fb_helper->buffer = NULL;	drm_client_buffer_vunmap(buffer);err_drm_client_buffer_delete:	drm_client_framebuffer_delete(buffer);	return ret;}EXPORT_SYMBOL(drm_fbdev_dma_driver_fbdev_probe);