kernel/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         .fb_check_var = drm_fb_helper_check_var,
  26         .fb_set_par = drm_fb_helper_set_par,
  27         .fb_fillrect = sys_fillrect,
  28         .fb_copyarea = sys_copyarea,
  29         .fb_imageblit = sys_imageblit,
  30         .fb_pan_display = drm_fb_helper_pan_display,
  31         .fb_blank = drm_fb_helper_blank,
  32         .fb_setcmap = drm_fb_helper_setcmap,
  33         .fb_mmap = bochsfb_mmap,
  34 };
  35
  36 static int bochsfb_create_object(struct bochs_device *bochs,
  37                                  struct drm_mode_fb_cmd2 *mode_cmd,
  38                                  struct drm_gem_object **gobj_p)
  39 {
  40         struct drm_device *dev = bochs->dev;
  41         struct drm_gem_object *gobj;
  42         u32 size;
  43         int ret = 0;
  44
  45         size = mode_cmd->pitches[0] * mode_cmd->height;
  46         ret = bochs_gem_create(dev, size, true, &gobj);
  47         if (ret)
  48                 return ret;
  49
  50         *gobj_p = gobj;
  51         return ret;
  52 }
  53
  54 static int bochsfb_create(struct drm_fb_helper *helper,
  55                           struct drm_fb_helper_surface_size *sizes)
  56 {
  57         struct bochs_device *bochs =
  58                 container_of(helper, struct bochs_device, fb.helper);
  59         struct drm_device *dev = bochs->dev;
  60         struct fb_info *info;
  61         struct drm_framebuffer *fb;
  62         struct drm_mode_fb_cmd2 mode_cmd;
  63         struct device *device = &dev->pdev->dev;
  64         struct drm_gem_object *gobj = NULL;
  65         struct bochs_bo *bo = NULL;
  66         int size, ret;
  67
  68         if (sizes->surface_bpp != 32)
  69                 return -EINVAL;
  70
  71         mode_cmd.width = sizes->surface_width;
  72         mode_cmd.height = sizes->surface_height;
  73         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
  74         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  75                                                           sizes->surface_depth);
  76         size = mode_cmd.pitches[0] * mode_cmd.height;
  77
  78         /* alloc, pin & map bo */
  79         ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
  80         if (ret) {
  81                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
  82                 return ret;
  83         }
  84
  85         bo = gem_to_bochs_bo(gobj);
  86
  87         ret = ttm_bo_reserve(&bo->bo, true, false, false, NULL);
  88         if (ret)
  89                 return ret;
  90
  91         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
  92         if (ret) {
  93                 DRM_ERROR("failed to pin fbcon\n");
  94                 ttm_bo_unreserve(&bo->bo);
  95                 return ret;
  96         }
  97
  98         ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
  99                           &bo->kmap);
 100         if (ret) {
 101                 DRM_ERROR("failed to kmap fbcon\n");
 102                 ttm_bo_unreserve(&bo->bo);
 103                 return ret;
 104         }
 105
 106         ttm_bo_unreserve(&bo->bo);
 107
 108         /* init fb device */
 109         info = framebuffer_alloc(0, device);
 110         if (info == NULL)
 111                 return -ENOMEM;
 112
 113         info->par = &bochs->fb.helper;
 114
 115         ret = bochs_framebuffer_init(bochs->dev, &bochs->fb.gfb, &mode_cmd, gobj);
 116         if (ret)
 117                 return ret;
 118
 119         bochs->fb.size = size;
 120
 121         /* setup helper */
 122         fb = &bochs->fb.gfb.base;
 123         bochs->fb.helper.fb = fb;
 124         bochs->fb.helper.fbdev = info;
 125
 126         strcpy(info->fix.id, "bochsdrmfb");
 127
 128         info->flags = FBINFO_DEFAULT;
 129         info->fbops = &bochsfb_ops;
 130
 131         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 132         drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
 133                                sizes->fb_height);
 134
 135         info->screen_base = bo->kmap.virtual;
 136         info->screen_size = size;
 137
 138         drm_vma_offset_remove(&bo->bo.bdev->vma_manager, &bo->bo.vma_node);
 139         info->fix.smem_start = 0;
 140         info->fix.smem_len = size;
 141
 142         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 143         if (ret) {
 144                 DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
 145                 return -ENOMEM;
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int bochs_fbdev_destroy(struct bochs_device *bochs)
 152 {
 153         struct bochs_framebuffer *gfb = &bochs->fb.gfb;
 154         struct fb_info *info;
 155
 156         DRM_DEBUG_DRIVER("\n");
 157
 158         if (bochs->fb.helper.fbdev) {
 159                 info = bochs->fb.helper.fbdev;
 160
 161                 unregister_framebuffer(info);
 162                 if (info->cmap.len)
 163                         fb_dealloc_cmap(&info->cmap);
 164                 framebuffer_release(info);
 165         }
 166
 167         if (gfb->obj) {
 168                 drm_gem_object_unreference_unlocked(gfb->obj);
 169                 gfb->obj = NULL;
 170         }
 171
 172         drm_fb_helper_fini(&bochs->fb.helper);
 173         drm_framebuffer_unregister_private(&gfb->base);
 174         drm_framebuffer_cleanup(&gfb->base);
 175
 176         return 0;
 177 }
 178
 179 void bochs_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 180                         u16 blue, int regno)
 181 {
 182 }
 183
 184 void bochs_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 185                         u16 *blue, int regno)
 186 {
 187         *red   = regno;
 188         *green = regno;
 189         *blue  = regno;
 190 }
 191
 192 static const struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
 193         .gamma_set = bochs_fb_gamma_set,
 194         .gamma_get = bochs_fb_gamma_get,
 195         .fb_probe = bochsfb_create,
 196 };
 197
 198 int bochs_fbdev_init(struct bochs_device *bochs)
 199 {
 200         int ret;
 201
 202         drm_fb_helper_prepare(bochs->dev, &bochs->fb.helper,
 203                               &bochs_fb_helper_funcs);
 204
 205         ret = drm_fb_helper_init(bochs->dev, &bochs->fb.helper,
 206                                  1, 1);
 207         if (ret)
 208                 return ret;
 209
 210         ret = drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
 211         if (ret)
 212                 goto fini;
 213
 214         drm_helper_disable_unused_functions(bochs->dev);
 215
 216         ret = drm_fb_helper_initial_config(&bochs->fb.helper, 32);
 217         if (ret)
 218                 goto fini;
 219
 220         bochs->fb.initialized = true;
 221         return 0;
 222
 223 fini:
 224         drm_fb_helper_fini(&bochs->fb.helper);
 225         return ret;
 226 }
 227
 228 void bochs_fbdev_fini(struct bochs_device *bochs)
 229 {
 230         if (!bochs->fb.initialized)
 231                 return;
 232
 233         bochs_fbdev_destroy(bochs);
 234         bochs->fb.initialized = false;
 235 }