drivers/gpu/drm/bochs/bochs_fbdev.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  */
   7
   8 #include "bochs.h"
   9 #include <drm/drm_gem_framebuffer_helper.h>
  10
  11 /* ---------------------------------------------------------------------- */
  12
  13 static int bochsfb_mmap(struct fb_info *info,
  14                         struct vm_area_struct *vma)
  15 {
  16         struct drm_fb_helper *fb_helper = info->par;
  17         struct bochs_bo *bo = gem_to_bochs_bo(fb_helper->fb->obj[0]);
  18
  19         return ttm_fbdev_mmap(vma, &bo->bo);
  20 }
  21
  22 static struct fb_ops bochsfb_ops = {
  23         .owner = THIS_MODULE,
  24         DRM_FB_HELPER_DEFAULT_OPS,
  25         .fb_fillrect = drm_fb_helper_cfb_fillrect,
  26         .fb_copyarea = drm_fb_helper_cfb_copyarea,
  27         .fb_imageblit = drm_fb_helper_cfb_imageblit,
  28         .fb_mmap = bochsfb_mmap,
  29 };
  30
  31 static int bochsfb_create_object(struct bochs_device *bochs,
  32                                  const struct drm_mode_fb_cmd2 *mode_cmd,
  33                                  struct drm_gem_object **gobj_p)
  34 {
  35         struct drm_device *dev = bochs->dev;
  36         struct drm_gem_object *gobj;
  37         u32 size;
  38         int ret = 0;
  39
  40         size = mode_cmd->pitches[0] * mode_cmd->height;
  41         ret = bochs_gem_create(dev, size, true, &gobj);
  42         if (ret)
  43                 return ret;
  44
  45         *gobj_p = gobj;
  46         return ret;
  47 }
  48
  49 static int bochsfb_create(struct drm_fb_helper *helper,
  50                           struct drm_fb_helper_surface_size *sizes)
  51 {
  52         struct bochs_device *bochs =
  53                 container_of(helper, struct bochs_device, fb.helper);
  54         struct fb_info *info;
  55         struct drm_framebuffer *fb;
  56         struct drm_mode_fb_cmd2 mode_cmd;
  57         struct drm_gem_object *gobj = NULL;
  58         struct bochs_bo *bo = NULL;
  59         int size, ret;
  60
  61         if (sizes->surface_bpp != 32)
  62                 return -EINVAL;
  63
  64         mode_cmd.width = sizes->surface_width;
  65         mode_cmd.height = sizes->surface_height;
  66         mode_cmd.pitches[0] = sizes->surface_width * 4;
  67         mode_cmd.pixel_format = DRM_FORMAT_HOST_XRGB8888;
  68         size = mode_cmd.pitches[0] * mode_cmd.height;
  69
  70         /* alloc, pin & map bo */
  71         ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
  72         if (ret) {
  73                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
  74                 return ret;
  75         }
  76
  77         bo = gem_to_bochs_bo(gobj);
  78
  79         ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
  80         if (ret)
  81                 return ret;
  82
  83         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
  84         if (ret) {
  85                 DRM_ERROR("failed to pin fbcon\n");
  86                 ttm_bo_unreserve(&bo->bo);
  87                 return ret;
  88         }
  89
  90         ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
  91                           &bo->kmap);
  92         if (ret) {
  93                 DRM_ERROR("failed to kmap fbcon\n");
  94                 ttm_bo_unreserve(&bo->bo);
  95                 return ret;
  96         }
  97
  98         ttm_bo_unreserve(&bo->bo);
  99
 100         /* init fb device */
 101         info = drm_fb_helper_alloc_fbi(helper);
 102         if (IS_ERR(info)) {
 103                 DRM_ERROR("Failed to allocate fbi: %ld\n", PTR_ERR(info));
 104                 return PTR_ERR(info);
 105         }
 106
 107         info->par = &bochs->fb.helper;
 108
 109         fb = drm_gem_fbdev_fb_create(bochs->dev, sizes, 0, gobj, NULL);
 110         if (IS_ERR(fb)) {
 111                 DRM_ERROR("Failed to create framebuffer: %ld\n", PTR_ERR(fb));
 112                 return PTR_ERR(fb);
 113         }
 114
 115         /* setup helper */
 116         bochs->fb.helper.fb = fb;
 117
 118         strcpy(info->fix.id, "bochsdrmfb");
 119
 120         info->fbops = &bochsfb_ops;
 121
 122         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 123         drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
 124                                sizes->fb_height);
 125
 126         info->screen_base = bo->kmap.virtual;
 127         info->screen_size = size;
 128
 129         drm_vma_offset_remove(&bo->bo.bdev->vma_manager, &bo->bo.vma_node);
 130         info->fix.smem_start = 0;
 131         info->fix.smem_len = size;
 132         return 0;
 133 }
 134
 135 static const struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
 136         .fb_probe = bochsfb_create,
 137 };
 138
 139 static struct drm_framebuffer *
 140 bochs_gem_fb_create(struct drm_device *dev, struct drm_file *file,
 141                     const struct drm_mode_fb_cmd2 *mode_cmd)
 142 {
 143         if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888 &&
 144             mode_cmd->pixel_format != DRM_FORMAT_BGRX8888)
 145                 return ERR_PTR(-EINVAL);
 146
 147         return drm_gem_fb_create(dev, file, mode_cmd);
 148 }
 149
 150 const struct drm_mode_config_funcs bochs_mode_funcs = {
 151         .fb_create = bochs_gem_fb_create,
 152 };
 153
 154 int bochs_fbdev_init(struct bochs_device *bochs)
 155 {
 156         return drm_fb_helper_fbdev_setup(bochs->dev, &bochs->fb.helper,
 157                                          &bochs_fb_helper_funcs, 32, 1);
 158 }
 159
 160 void bochs_fbdev_fini(struct bochs_device *bochs)
 161 {
 162         drm_fb_helper_fbdev_teardown(bochs->dev);
 163 }