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 = drm_fb_helper_sys_fillrect,
  28         .fb_copyarea = drm_fb_helper_sys_copyarea,
  29         .fb_imageblit = drm_fb_helper_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 fb_info *info;
  60         struct drm_framebuffer *fb;
  61         struct drm_mode_fb_cmd2 mode_cmd;
  62         struct drm_gem_object *gobj = NULL;
  63         struct bochs_bo *bo = NULL;
  64         int size, ret;
  65
  66         if (sizes->surface_bpp != 32)
  67                 return -EINVAL;
  68
  69         mode_cmd.width = sizes->surface_width;
  70         mode_cmd.height = sizes->surface_height;
  71         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
  72         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  73                                                           sizes->surface_depth);
  74         size = mode_cmd.pitches[0] * mode_cmd.height;
  75
  76         /* alloc, pin & map bo */
  77         ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
  78         if (ret) {
  79                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
  80                 return ret;
  81         }
  82
  83         bo = gem_to_bochs_bo(gobj);
  84
  85         ret = ttm_bo_reserve(&bo->bo, true, false, false, NULL);
  86         if (ret)
  87                 return ret;
  88
  89         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
  90         if (ret) {
  91                 DRM_ERROR("failed to pin fbcon\n");
  92                 ttm_bo_unreserve(&bo->bo);
  93                 return ret;
  94         }
  95
  96         ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
  97                           &bo->kmap);
  98         if (ret) {
  99                 DRM_ERROR("failed to kmap fbcon\n");
 100                 ttm_bo_unreserve(&bo->bo);
 101                 return ret;
 102         }
 103
 104         ttm_bo_unreserve(&bo->bo);
 105
 106         /* init fb device */
 107         info = drm_fb_helper_alloc_fbi(helper);
 108         if (IS_ERR(info))
 109                 return PTR_ERR(info);
 110
 111         info->par = &bochs->fb.helper;
 112
 113         ret = bochs_framebuffer_init(bochs->dev, &bochs->fb.gfb, &mode_cmd, gobj);
 114         if (ret) {
 115                 drm_fb_helper_release_fbi(helper);
 116                 return ret;
 117         }
 118
 119         bochs->fb.size = size;
 120
 121         /* setup helper */
 122         fb = &bochs->fb.gfb.base;
 123         bochs->fb.helper.fb = fb;
 124
 125         strcpy(info->fix.id, "bochsdrmfb");
 126
 127         info->flags = FBINFO_DEFAULT;
 128         info->fbops = &bochsfb_ops;
 129
 130         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 131         drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
 132                                sizes->fb_height);
 133
 134         info->screen_base = bo->kmap.virtual;
 135         info->screen_size = size;
 136
 137         drm_vma_offset_remove(&bo->bo.bdev->vma_manager, &bo->bo.vma_node);
 138         info->fix.smem_start = 0;
 139         info->fix.smem_len = size;
 140
 141         return 0;
 142 }
 143
 144 static int bochs_fbdev_destroy(struct bochs_device *bochs)
 145 {
 146         struct bochs_framebuffer *gfb = &bochs->fb.gfb;
 147
 148         DRM_DEBUG_DRIVER("\n");
 149
 150         drm_fb_helper_unregister_fbi(&bochs->fb.helper);
 151         drm_fb_helper_release_fbi(&bochs->fb.helper);
 152
 153         if (gfb->obj) {
 154                 drm_gem_object_unreference_unlocked(gfb->obj);
 155                 gfb->obj = NULL;
 156         }
 157
 158         drm_fb_helper_fini(&bochs->fb.helper);
 159         drm_framebuffer_unregister_private(&gfb->base);
 160         drm_framebuffer_cleanup(&gfb->base);
 161
 162         return 0;
 163 }
 164
 165 void bochs_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 166                         u16 blue, int regno)
 167 {
 168 }
 169
 170 void bochs_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 171                         u16 *blue, int regno)
 172 {
 173         *red   = regno;
 174         *green = regno;
 175         *blue  = regno;
 176 }
 177
 178 static const struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
 179         .gamma_set = bochs_fb_gamma_set,
 180         .gamma_get = bochs_fb_gamma_get,
 181         .fb_probe = bochsfb_create,
 182 };
 183
 184 int bochs_fbdev_init(struct bochs_device *bochs)
 185 {
 186         int ret;
 187
 188         drm_fb_helper_prepare(bochs->dev, &bochs->fb.helper,
 189                               &bochs_fb_helper_funcs);
 190
 191         ret = drm_fb_helper_init(bochs->dev, &bochs->fb.helper,
 192                                  1, 1);
 193         if (ret)
 194                 return ret;
 195
 196         ret = drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
 197         if (ret)
 198                 goto fini;
 199
 200         drm_helper_disable_unused_functions(bochs->dev);
 201
 202         ret = drm_fb_helper_initial_config(&bochs->fb.helper, 32);
 203         if (ret)
 204                 goto fini;
 205
 206         bochs->fb.initialized = true;
 207         return 0;
 208
 209 fini:
 210         drm_fb_helper_fini(&bochs->fb.helper);
 211         return ret;
 212 }
 213
 214 void bochs_fbdev_fini(struct bochs_device *bochs)
 215 {
 216         if (!bochs->fb.initialized)
 217                 return;
 218
 219         bochs_fbdev_destroy(bochs);
 220         bochs->fb.initialized = false;
 221 }