| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2012 Red Hat |
| * Copyright (c) 2015 - 2018 DisplayLink (UK) Ltd. |
| * |
| * Based on parts on udlfb.c: |
| * Copyright (C) 2009 its respective authors |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License v2. See the file COPYING in the main directory of this archive for |
| * more details. |
| */ |
| |
| #include <linux/slab.h> |
| #ifdef CONFIG_FB |
| #include <linux/fb.h> |
| #endif /* CONFIG_FB */ |
| #include <linux/dma-buf.h> |
| #include <drm/drmP.h> |
| #include <drm/drm_crtc.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/drm_fb_helper.h> |
| #include "evdi_drv.h" |
| |
| struct evdi_fbdev { |
| struct drm_fb_helper helper; |
| struct evdi_framebuffer ufb; |
| struct list_head fbdev_list; |
| int fb_count; |
| }; |
| |
| struct drm_clip_rect evdi_framebuffer_sanitize_rect( |
| const struct evdi_framebuffer *fb, |
| const struct drm_clip_rect *dirty_rect) |
| { |
| struct drm_clip_rect rect = *dirty_rect; |
| |
| if (rect.x1 > rect.x2) { |
| unsigned short tmp = rect.x2; |
| |
| EVDI_WARN("Wrong clip rect: x1 > x2\n"); |
| rect.x2 = rect.x1; |
| rect.x1 = tmp; |
| } |
| |
| if (rect.y1 > rect.y2) { |
| unsigned short tmp = rect.y2; |
| |
| EVDI_WARN("Wrong clip rect: y1 > y2\n"); |
| rect.y2 = rect.y1; |
| rect.y1 = tmp; |
| } |
| |
| |
| if (rect.x1 > fb->base.width) { |
| EVDI_WARN("Wrong clip rect: x1 > fb.width\n"); |
| rect.x1 = fb->base.width; |
| } |
| |
| if (rect.y1 > fb->base.height) { |
| EVDI_WARN("Wrong clip rect: y1 > fb.height\n"); |
| rect.y1 = fb->base.height; |
| } |
| |
| if (rect.x2 > fb->base.width) { |
| EVDI_VERBOSE("Wrong clip rect: x2 > fb.width\n"); |
| rect.x2 = fb->base.width; |
| } |
| |
| if (rect.y2 > fb->base.height) { |
| EVDI_VERBOSE("Wrong clip rect: y2 > fb.height\n"); |
| rect.y2 = fb->base.height; |
| } |
| |
| return rect; |
| } |
| |
| static int evdi_handle_damage(struct evdi_framebuffer *fb, |
| int x, int y, int width, int height) |
| { |
| const struct drm_clip_rect dirty_rect = { x, y, x + width, y + height }; |
| const struct drm_clip_rect rect = |
| evdi_framebuffer_sanitize_rect(fb, &dirty_rect); |
| struct drm_device *dev = fb->base.dev; |
| struct evdi_device *evdi = dev->dev_private; |
| |
| EVDI_CHECKPT(); |
| |
| if (!fb->active) |
| return 0; |
| evdi_painter_set_new_scanout_buffer(evdi, fb); |
| evdi_painter_commit_scanout_buffer(evdi); |
| evdi_painter_mark_dirty(evdi, &rect); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_FB |
| static int evdi_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) |
| { |
| unsigned long start = vma->vm_start; |
| unsigned long size = vma->vm_end - vma->vm_start; |
| unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
| unsigned long page, pos; |
| |
| if (offset > info->fix.smem_len || |
| size > info->fix.smem_len - offset) |
| return -EINVAL; |
| |
| pos = (unsigned long)info->fix.smem_start + offset; |
| |
| pr_notice("mmap() framebuffer addr:%lu size:%lu\n", pos, size); |
| |
| while (size > 0) { |
| page = vmalloc_to_pfn((void *)pos); |
| if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) |
| return -EAGAIN; |
| |
| start += PAGE_SIZE; |
| pos += PAGE_SIZE; |
| if (size > PAGE_SIZE) |
| size -= PAGE_SIZE; |
| else |
| size = 0; |
| } |
| |
| return 0; |
| } |
| |
| static void evdi_fb_fillrect(struct fb_info *info, |
| const struct fb_fillrect *rect) |
| { |
| struct evdi_fbdev *ufbdev = info->par; |
| |
| EVDI_CHECKPT(); |
| sys_fillrect(info, rect); |
| evdi_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width, |
| rect->height); |
| } |
| |
| static void evdi_fb_copyarea(struct fb_info *info, |
| const struct fb_copyarea *region) |
| { |
| struct evdi_fbdev *ufbdev = info->par; |
| |
| EVDI_CHECKPT(); |
| sys_copyarea(info, region); |
| evdi_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width, |
| region->height); |
| } |
| |
| static void evdi_fb_imageblit(struct fb_info *info, |
| const struct fb_image *image) |
| { |
| struct evdi_fbdev *ufbdev = info->par; |
| |
| EVDI_CHECKPT(); |
| sys_imageblit(info, image); |
| evdi_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width, |
| image->height); |
| } |
| |
| /* |
| * It's common for several clients to have framebuffer open simultaneously. |
| * e.g. both fbcon and X. Makes things interesting. |
| * Assumes caller is holding info->lock (for open and release at least) |
| */ |
| static int evdi_fb_open(struct fb_info *info, int user) |
| { |
| struct evdi_fbdev *ufbdev = info->par; |
| |
| ufbdev->fb_count++; |
| pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", |
| info->node, user, info, ufbdev->fb_count); |
| |
| return 0; |
| } |
| |
| /* |
| * Assumes caller is holding info->lock mutex (for open and release at least) |
| */ |
| static int evdi_fb_release(struct fb_info *info, int user) |
| { |
| struct evdi_fbdev *ufbdev = info->par; |
| |
| ufbdev->fb_count--; |
| |
| pr_warn("released /dev/fb%d user=%d count=%d\n", |
| info->node, user, ufbdev->fb_count); |
| |
| return 0; |
| } |
| |
| static struct fb_ops evdifb_ops = { |
| .owner = THIS_MODULE, |
| .fb_check_var = drm_fb_helper_check_var, |
| .fb_set_par = drm_fb_helper_set_par, |
| .fb_fillrect = evdi_fb_fillrect, |
| .fb_copyarea = evdi_fb_copyarea, |
| .fb_imageblit = evdi_fb_imageblit, |
| .fb_pan_display = drm_fb_helper_pan_display, |
| .fb_blank = drm_fb_helper_blank, |
| .fb_setcmap = drm_fb_helper_setcmap, |
| .fb_debug_enter = drm_fb_helper_debug_enter, |
| .fb_debug_leave = drm_fb_helper_debug_leave, |
| .fb_mmap = evdi_fb_mmap, |
| .fb_open = evdi_fb_open, |
| .fb_release = evdi_fb_release, |
| }; |
| #endif /* CONFIG_FB */ |
| |
| static int evdi_user_framebuffer_dirty(struct drm_framebuffer *fb, |
| __always_unused struct drm_file *file, |
| __always_unused unsigned int flags, |
| __always_unused unsigned int color, |
| struct drm_clip_rect *clips, |
| unsigned int num_clips) |
| { |
| struct evdi_framebuffer *ufb = to_evdi_fb(fb); |
| struct drm_device *dev = ufb->base.dev; |
| struct evdi_device *evdi = dev->dev_private; |
| int i; |
| int ret = 0; |
| |
| EVDI_CHECKPT(); |
| drm_modeset_lock_all(fb->dev); |
| |
| if (!ufb->active) |
| goto unlock; |
| |
| if (ufb->obj->base.import_attach) { |
| ret = |
| dma_buf_begin_cpu_access( |
| ufb->obj->base.import_attach->dmabuf, |
| DMA_FROM_DEVICE); |
| if (ret) |
| goto unlock; |
| } |
| |
| for (i = 0; i < num_clips; i++) { |
| ret = evdi_handle_damage(ufb, clips[i].x1, clips[i].y1, |
| clips[i].x2 - clips[i].x1, |
| clips[i].y2 - clips[i].y1); |
| if (ret) |
| goto unlock; |
| } |
| |
| if (ufb->obj->base.import_attach) |
| dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf, |
| DMA_FROM_DEVICE); |
| atomic_add(1, &evdi->frame_count); |
| unlock: |
| drm_modeset_unlock_all(fb->dev); |
| return ret; |
| } |
| |
| static int evdi_user_framebuffer_create_handle(struct drm_framebuffer *fb, |
| struct drm_file *file_priv, |
| unsigned int *handle) |
| { |
| struct evdi_framebuffer *efb = to_evdi_fb(fb); |
| |
| return drm_gem_handle_create(file_priv, &efb->obj->base, handle); |
| } |
| |
| static void evdi_user_framebuffer_destroy(struct drm_framebuffer *fb) |
| { |
| struct evdi_framebuffer *ufb = to_evdi_fb(fb); |
| |
| EVDI_CHECKPT(); |
| |
| if (ufb->obj) |
| drm_gem_object_unreference_unlocked(&ufb->obj->base); |
| |
| drm_framebuffer_cleanup(fb); |
| kfree(ufb); |
| } |
| |
| static const struct drm_framebuffer_funcs evdifb_funcs = { |
| .create_handle = evdi_user_framebuffer_create_handle, |
| .destroy = evdi_user_framebuffer_destroy, |
| .dirty = evdi_user_framebuffer_dirty, |
| }; |
| |
| static int |
| evdi_framebuffer_init(struct drm_device *dev, |
| struct evdi_framebuffer *ufb, |
| const struct drm_mode_fb_cmd2 *mode_cmd, |
| struct evdi_gem_object *obj) |
| { |
| ufb->obj = obj; |
| drm_helper_mode_fill_fb_struct(dev, &ufb->base, mode_cmd); |
| return drm_framebuffer_init(dev, &ufb->base, &evdifb_funcs); |
| } |
| |
| #ifdef CONFIG_FB |
| static int evdifb_create(struct drm_fb_helper *helper, |
| struct drm_fb_helper_surface_size *sizes) |
| { |
| struct evdi_fbdev *ufbdev = (struct evdi_fbdev *)helper; |
| struct drm_device *dev = ufbdev->helper.dev; |
| struct fb_info *info; |
| struct device *device = dev->dev; |
| struct drm_framebuffer *fb; |
| struct drm_mode_fb_cmd2 mode_cmd; |
| struct evdi_gem_object *obj; |
| uint32_t size; |
| int ret = 0; |
| |
| if (sizes->surface_bpp == 24) { |
| sizes->surface_bpp = 32; |
| } else if (sizes->surface_bpp != 32) { |
| EVDI_ERROR("Not supported pixel format (bpp=%d)\n", |
| sizes->surface_bpp); |
| return -EINVAL; |
| } |
| |
| mode_cmd.width = sizes->surface_width; |
| mode_cmd.height = sizes->surface_height; |
| mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8); |
| |
| mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, |
| sizes->surface_depth); |
| |
| size = mode_cmd.pitches[0] * mode_cmd.height; |
| size = ALIGN(size, PAGE_SIZE); |
| |
| obj = evdi_gem_alloc_object(dev, size); |
| if (!obj) |
| goto out; |
| |
| ret = evdi_gem_vmap(obj); |
| if (ret) { |
| DRM_ERROR("failed to vmap fb\n"); |
| goto out_gfree; |
| } |
| |
| info = framebuffer_alloc(0, device); |
| if (!info) { |
| ret = -ENOMEM; |
| goto out_gfree; |
| } |
| info->par = ufbdev; |
| |
| ret = evdi_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj); |
| if (ret) |
| goto out_gfree; |
| |
| fb = &ufbdev->ufb.base; |
| |
| ufbdev->helper.fb = fb; |
| ufbdev->helper.fbdev = info; |
| |
| strcpy(info->fix.id, "evdidrmfb"); |
| |
| info->screen_base = ufbdev->ufb.obj->vmapping; |
| info->fix.smem_len = size; |
| info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping; |
| |
| info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT; |
| info->fbops = &evdifb_ops; |
| drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth); |
| drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, |
| sizes->fb_height); |
| |
| ret = fb_alloc_cmap(&info->cmap, 256, 0); |
| if (ret) { |
| ret = -ENOMEM; |
| goto out_gfree; |
| } |
| |
| DRM_DEBUG_KMS("allocated %dx%d vmal %p\n", |
| fb->width, fb->height, ufbdev->ufb.obj->vmapping); |
| |
| return ret; |
| out_gfree: |
| drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base); |
| out: |
| return ret; |
| } |
| |
| static struct drm_fb_helper_funcs evdi_fb_helper_funcs = { |
| .fb_probe = evdifb_create, |
| }; |
| |
| static void evdi_fbdev_destroy(__always_unused struct drm_device *dev, |
| struct evdi_fbdev *ufbdev) |
| { |
| struct fb_info *info; |
| |
| if (ufbdev->helper.fbdev) { |
| info = ufbdev->helper.fbdev; |
| unregister_framebuffer(info); |
| if (info->cmap.len) |
| fb_dealloc_cmap(&info->cmap); |
| |
| framebuffer_release(info); |
| } |
| drm_fb_helper_fini(&ufbdev->helper); |
| drm_framebuffer_unregister_private(&ufbdev->ufb.base); |
| drm_framebuffer_cleanup(&ufbdev->ufb.base); |
| drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base); |
| } |
| |
| int evdi_fbdev_init(struct drm_device *dev) |
| { |
| struct evdi_device *evdi; |
| struct evdi_fbdev *ufbdev; |
| int ret; |
| |
| evdi = dev->dev_private; |
| ufbdev = kzalloc(sizeof(struct evdi_fbdev), GFP_KERNEL); |
| if (!ufbdev) |
| return -ENOMEM; |
| |
| evdi->fbdev = ufbdev; |
| drm_fb_helper_prepare(dev, &ufbdev->helper, &evdi_fb_helper_funcs); |
| |
| ret = drm_fb_helper_init(dev, &ufbdev->helper, 1); |
| if (ret) { |
| kfree(ufbdev); |
| return ret; |
| } |
| |
| drm_fb_helper_single_add_all_connectors(&ufbdev->helper); |
| |
| ret = drm_fb_helper_initial_config(&ufbdev->helper, 32); |
| if (ret) { |
| drm_fb_helper_fini(&ufbdev->helper); |
| kfree(ufbdev); |
| } |
| return ret; |
| } |
| |
| void evdi_fbdev_cleanup(struct drm_device *dev) |
| { |
| struct evdi_device *evdi = dev->dev_private; |
| |
| if (!evdi->fbdev) |
| return; |
| |
| evdi_fbdev_destroy(dev, evdi->fbdev); |
| kfree(evdi->fbdev); |
| evdi->fbdev = NULL; |
| } |
| |
| void evdi_fbdev_unplug(struct drm_device *dev) |
| { |
| struct evdi_device *evdi = dev->dev_private; |
| struct evdi_fbdev *ufbdev; |
| |
| if (!evdi->fbdev) |
| return; |
| |
| ufbdev = evdi->fbdev; |
| if (ufbdev->helper.fbdev) { |
| struct fb_info *info; |
| |
| info = ufbdev->helper.fbdev; |
| unlink_framebuffer(info); |
| } |
| } |
| #endif /* CONFIG_FB */ |
| |
| int evdi_fb_get_bpp(uint32_t format) |
| { |
| const struct drm_format_info *info; |
| |
| info = drm_format_info(format); |
| if (info && info->depth) |
| return info->cpp[0] * 8; |
| return 0; |
| } |
| |
| struct drm_framebuffer *evdi_fb_user_fb_create( |
| struct drm_device *dev, |
| struct drm_file *file, |
| const struct drm_mode_fb_cmd2 *mode_cmd) |
| { |
| struct drm_gem_object *obj; |
| struct evdi_framebuffer *ufb; |
| int ret; |
| uint32_t size; |
| |
| int bpp = evdi_fb_get_bpp(mode_cmd->pixel_format); |
| |
| if (bpp != 32) { |
| EVDI_ERROR("Unsupported bpp (%d)\n", bpp); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| obj = drm_gem_object_lookup(file, mode_cmd->handles[0]); |
| if (obj == NULL) |
| return ERR_PTR(-ENOENT); |
| |
| size = mode_cmd->pitches[0] * mode_cmd->height; |
| size = ALIGN(size, PAGE_SIZE); |
| |
| if (size > obj->size) { |
| DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", |
| size, obj->size, mode_cmd->pitches[0], |
| mode_cmd->height); |
| goto err_no_mem; |
| } |
| |
| ufb = kzalloc(sizeof(*ufb), GFP_KERNEL); |
| if (ufb == NULL) |
| goto err_no_mem; |
| |
| ret = evdi_framebuffer_init(dev, ufb, mode_cmd, to_evdi_bo(obj)); |
| if (ret) |
| goto err_inval; |
| return &ufb->base; |
| |
| err_no_mem: |
| drm_gem_object_unreference(obj); |
| return ERR_PTR(-ENOMEM); |
| err_inval: |
| kfree(ufb); |
| drm_gem_object_unreference(obj); |
| return ERR_PTR(-EINVAL); |
| } |