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
  10 /* ---------------------------------------------------------------------- */
  11
  12 static int bochsfb_mmap(struct fb_info *info,
  13                         struct vm_area_struct *vma)
  14 {
  15         struct drm_fb_helper *fb_helper = info->par;
  16         struct bochs_device *bochs =
  17                 container_of(fb_helper, struct bochs_device, fb.helper);
  18         struct bochs_bo *bo = gem_to_bochs_bo(bochs->fb.gfb.obj);
  19
  20         return ttm_fbdev_mmap(vma, &bo->bo);
  21 }
  22
  23 static struct fb_ops bochsfb_ops = {
  24         .owner = THIS_MODULE,
  25         DRM_FB_HELPER_DEFAULT_OPS,
  26         .fb_fillrect = drm_fb_helper_cfb_fillrect,
  27         .fb_copyarea = drm_fb_helper_cfb_copyarea,
  28         .fb_imageblit = drm_fb_helper_cfb_imageblit,
  29         .fb_mmap = bochsfb_mmap,
  30 };
  31
  32 static int bochsfb_create_object(struct bochs_device *bochs,
  33                                  const struct drm_mode_fb_cmd2 *mode_cmd,
  34                                  struct drm_gem_object **gobj_p)
  35 {
  36         struct drm_device *dev = bochs->dev;
  37         struct drm_gem_object *gobj;
  38         u32 size;
  39         int ret = 0;
  40
  41         size = mode_cmd->pitches[0] * mode_cmd->height;
  42         ret = bochs_gem_create(dev, size, true, &gobj);
  43         if (ret)
  44                 return ret;
  45
  46         *gobj_p = gobj;
  47         return ret;
  48 }
  49
  50 static int bochsfb_create(struct drm_fb_helper *helper,
  51                           struct drm_fb_helper_surface_size *sizes)
  52 {
  53         struct bochs_device *bochs =
  54                 container_of(helper, struct bochs_device, fb.helper);
  55         struct fb_info *info;
  56         struct drm_framebuffer *fb;
  57         struct drm_mode_fb_cmd2 mode_cmd;
  58         struct drm_gem_object *gobj = NULL;
  59         struct bochs_bo *bo = NULL;
  60         int size, ret;
  61
  62         if (sizes->surface_bpp != 32)
  63                 return -EINVAL;
  64
  65         mode_cmd.width = sizes->surface_width;
  66         mode_cmd.height = sizes->surface_height;
  67         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
  68         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  69                                                           sizes->surface_depth);
  70         size = mode_cmd.pitches[0] * mode_cmd.height;
  71
  72         /* alloc, pin & map bo */
  73         ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
  74         if (ret) {
  75                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
  76                 return ret;
  77         }
  78
  79         bo = gem_to_bochs_bo(gobj);
  80
  81         ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
  82         if (ret)
  83                 return ret;
  84
  85         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
  86         if (ret) {
  87                 DRM_ERROR("failed to pin fbcon\n");
  88                 ttm_bo_unreserve(&bo->bo);
  89                 return ret;
  90         }
  91
  92         ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
  93                           &bo->kmap);
  94         if (ret) {
  95                 DRM_ERROR("failed to kmap fbcon\n");
  96                 ttm_bo_unreserve(&bo->bo);
  97                 return ret;
  98         }
  99
 100         ttm_bo_unreserve(&bo->bo);
 101
 102         /* init fb device */
 103         info = drm_fb_helper_alloc_fbi(helper);
 104         if (IS_ERR(info))
 105                 return PTR_ERR(info);
 106
 107         info->par = &bochs->fb.helper;
 108
 109         ret = bochs_framebuffer_init(bochs->dev, &bochs->fb.gfb, &mode_cmd, gobj);
 110         if (ret)
 111                 return ret;
 112
 113         bochs->fb.size = size;
 114
 115         /* setup helper */
 116         fb = &bochs->fb.gfb.base;
 117         bochs->fb.helper.fb = fb;
 118
 119         strcpy(info->fix.id, "bochsdrmfb");
 120
 121         info->fbops = &bochsfb_ops;
 122
 123         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 124         drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
 125                                sizes->fb_height);
 126
 127         info->screen_base = bo->kmap.virtual;
 128         info->screen_size = size;
 129
 130         drm_vma_offset_remove(&bo->bo.bdev->vma_manager, &bo->bo.vma_node);
 131         info->fix.smem_start = 0;
 132         info->fix.smem_len = size;
 133
 134         bochs->fb.initialized = true;
 135         return 0;
 136 }
 137
 138 static int bochs_fbdev_destroy(struct bochs_device *bochs)
 139 {
 140         struct bochs_framebuffer *gfb = &bochs->fb.gfb;
 141
 142         DRM_DEBUG_DRIVER("\n");
 143
 144         drm_fb_helper_unregister_fbi(&bochs->fb.helper);
 145
 146         if (gfb->obj) {
 147                 drm_gem_object_unreference_unlocked(gfb->obj);
 148                 gfb->obj = NULL;
 149         }
 150
 151         drm_framebuffer_unregister_private(&gfb->base);
 152         drm_framebuffer_cleanup(&gfb->base);
 153
 154         return 0;
 155 }
 156
 157 static const struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
 158         .fb_probe = bochsfb_create,
 159 };
 160
 161 int bochs_fbdev_init(struct bochs_device *bochs)
 162 {
 163         int ret;
 164
 165         drm_fb_helper_prepare(bochs->dev, &bochs->fb.helper,
 166                               &bochs_fb_helper_funcs);
 167
 168         ret = drm_fb_helper_init(bochs->dev, &bochs->fb.helper, 1);
 169         if (ret)
 170                 return ret;
 171
 172         ret = drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
 173         if (ret)
 174                 goto fini;
 175
 176         drm_helper_disable_unused_functions(bochs->dev);
 177
 178         ret = drm_fb_helper_initial_config(&bochs->fb.helper, 32);
 179         if (ret)
 180                 goto fini;
 181
 182         return 0;
 183
 184 fini:
 185         drm_fb_helper_fini(&bochs->fb.helper);
 186         return ret;
 187 }
 188
 189 void bochs_fbdev_fini(struct bochs_device *bochs)
 190 {
 191         if (bochs->fb.initialized)
 192                 bochs_fbdev_destroy(bochs);
 193
 194         if (bochs->fb.helper.fbdev)
 195                 drm_fb_helper_fini(&bochs->fb.helper);
 196
 197         bochs->fb.initialized = false;
 198 }