drivers/gpu/drm/mgag200/mgag200_fb.c

   1 /*
   2  * Copyright 2010 Matt Turner.
   3  * Copyright 2012 Red Hat
   4  *
   5  * This file is subject to the terms and conditions of the GNU General
   6  * Public License version 2. See the file COPYING in the main
   7  * directory of this archive for more details.
   8  *
   9  * Authors: Matthew Garrett
  10  *          Matt Turner
  11  *          Dave Airlie
  12  */
  13 #include <linux/module.h>
  14 #include <drm/drmP.h>
  15 #include <drm/drm_util.h>
  16 #include <drm/drm_fb_helper.h>
  17 #include <drm/drm_crtc_helper.h>
  18
  19 #include "mgag200_drv.h"
  20
  21 static void mga_dirty_update(struct mga_fbdev *mfbdev,
  22                              int x, int y, int width, int height)
  23 {
  24         int i;
  25         struct drm_gem_object *obj;
  26         struct drm_gem_vram_object *gbo;
  27         int src_offset, dst_offset;
  28         int bpp = mfbdev->mfb.base.format->cpp[0];
  29         int ret = -EBUSY;
  30         bool unmap = false;
  31         bool store_for_later = false;
  32         int x2, y2;
  33         unsigned long flags;
  34
  35         obj = mfbdev->mfb.obj;
  36         gbo = drm_gem_vram_of_gem(obj);
  37
  38         /*
  39          * try and reserve the BO, if we fail with busy
  40          * then the BO is being moved and we should
  41          * store up the damage until later.
  42          */
  43         if (drm_can_sleep())
  44                 ret = drm_gem_vram_reserve(gbo, true);
  45         if (ret) {
  46                 if (ret != -EBUSY)
  47                         return;
  48
  49                 store_for_later = true;
  50         }
  51
  52         x2 = x + width - 1;
  53         y2 = y + height - 1;
  54         spin_lock_irqsave(&mfbdev->dirty_lock, flags);
  55
  56         if (mfbdev->y1 < y)
  57                 y = mfbdev->y1;
  58         if (mfbdev->y2 > y2)
  59                 y2 = mfbdev->y2;
  60         if (mfbdev->x1 < x)
  61                 x = mfbdev->x1;
  62         if (mfbdev->x2 > x2)
  63                 x2 = mfbdev->x2;
  64
  65         if (store_for_later) {
  66                 mfbdev->x1 = x;
  67                 mfbdev->x2 = x2;
  68                 mfbdev->y1 = y;
  69                 mfbdev->y2 = y2;
  70                 spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
  71                 return;
  72         }
  73
  74         mfbdev->x1 = mfbdev->y1 = INT_MAX;
  75         mfbdev->x2 = mfbdev->y2 = 0;
  76         spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
  77
  78         if (!gbo->kmap.virtual) {
  79                 ret = ttm_bo_kmap(&gbo->bo, 0, gbo->bo.num_pages, &gbo->kmap);
  80                 if (ret) {
  81                         DRM_ERROR("failed to kmap fb updates\n");
  82                         drm_gem_vram_unreserve(gbo);
  83                         return;
  84                 }
  85                 unmap = true;
  86         }
  87         for (i = y; i <= y2; i++) {
  88                 /* assume equal stride for now */
  89                 src_offset = dst_offset =
  90                         i * mfbdev->mfb.base.pitches[0] + (x * bpp);
  91                 memcpy_toio(gbo->kmap.virtual + src_offset,
  92                             mfbdev->sysram + dst_offset, (x2 - x + 1) * bpp);
  93
  94         }
  95         if (unmap)
  96                 ttm_bo_kunmap(&gbo->kmap);
  97
  98         drm_gem_vram_unreserve(gbo);
  99 }
 100
 101 static void mga_fillrect(struct fb_info *info,
 102                          const struct fb_fillrect *rect)
 103 {
 104         struct mga_fbdev *mfbdev = info->par;
 105         drm_fb_helper_sys_fillrect(info, rect);
 106         mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
 107                          rect->height);
 108 }
 109
 110 static void mga_copyarea(struct fb_info *info,
 111                          const struct fb_copyarea *area)
 112 {
 113         struct mga_fbdev *mfbdev = info->par;
 114         drm_fb_helper_sys_copyarea(info, area);
 115         mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
 116                          area->height);
 117 }
 118
 119 static void mga_imageblit(struct fb_info *info,
 120                           const struct fb_image *image)
 121 {
 122         struct mga_fbdev *mfbdev = info->par;
 123         drm_fb_helper_sys_imageblit(info, image);
 124         mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
 125                          image->height);
 126 }
 127
 128
 129 static struct fb_ops mgag200fb_ops = {
 130         .owner = THIS_MODULE,
 131         .fb_check_var = drm_fb_helper_check_var,
 132         .fb_set_par = drm_fb_helper_set_par,
 133         .fb_fillrect = mga_fillrect,
 134         .fb_copyarea = mga_copyarea,
 135         .fb_imageblit = mga_imageblit,
 136         .fb_pan_display = drm_fb_helper_pan_display,
 137         .fb_blank = drm_fb_helper_blank,
 138         .fb_setcmap = drm_fb_helper_setcmap,
 139 };
 140
 141 static int mgag200fb_create_object(struct mga_fbdev *afbdev,
 142                                    const struct drm_mode_fb_cmd2 *mode_cmd,
 143                                    struct drm_gem_object **gobj_p)
 144 {
 145         struct drm_device *dev = afbdev->helper.dev;
 146         u32 size;
 147         struct drm_gem_object *gobj;
 148         int ret = 0;
 149
 150         size = mode_cmd->pitches[0] * mode_cmd->height;
 151         ret = mgag200_gem_create(dev, size, true, &gobj);
 152         if (ret)
 153                 return ret;
 154
 155         *gobj_p = gobj;
 156         return ret;
 157 }
 158
 159 static int mgag200fb_create(struct drm_fb_helper *helper,
 160                            struct drm_fb_helper_surface_size *sizes)
 161 {
 162         struct mga_fbdev *mfbdev =
 163                 container_of(helper, struct mga_fbdev, helper);
 164         struct drm_device *dev = mfbdev->helper.dev;
 165         struct drm_mode_fb_cmd2 mode_cmd;
 166         struct mga_device *mdev = dev->dev_private;
 167         struct fb_info *info;
 168         struct drm_framebuffer *fb;
 169         struct drm_gem_object *gobj = NULL;
 170         int ret;
 171         void *sysram;
 172         int size;
 173
 174         mode_cmd.width = sizes->surface_width;
 175         mode_cmd.height = sizes->surface_height;
 176         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 177
 178         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 179                                                           sizes->surface_depth);
 180         size = mode_cmd.pitches[0] * mode_cmd.height;
 181
 182         ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
 183         if (ret) {
 184                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 185                 return ret;
 186         }
 187
 188         sysram = vmalloc(size);
 189         if (!sysram) {
 190                 ret = -ENOMEM;
 191                 goto err_sysram;
 192         }
 193
 194         info = drm_fb_helper_alloc_fbi(helper);
 195         if (IS_ERR(info)) {
 196                 ret = PTR_ERR(info);
 197                 goto err_alloc_fbi;
 198         }
 199
 200         ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
 201         if (ret)
 202                 goto err_alloc_fbi;
 203
 204         mfbdev->sysram = sysram;
 205         mfbdev->size = size;
 206
 207         fb = &mfbdev->mfb.base;
 208
 209         /* setup helper */
 210         mfbdev->helper.fb = fb;
 211
 212         info->fbops = &mgag200fb_ops;
 213
 214         /* setup aperture base/size for vesafb takeover */
 215         info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
 216         info->apertures->ranges[0].size = mdev->mc.vram_size;
 217
 218         drm_fb_helper_fill_info(info, &mfbdev->helper, sizes);
 219
 220         info->screen_base = sysram;
 221         info->screen_size = size;
 222         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 223
 224         DRM_DEBUG_KMS("allocated %dx%d\n",
 225                       fb->width, fb->height);
 226
 227         return 0;
 228
 229 err_alloc_fbi:
 230         vfree(sysram);
 231 err_sysram:
 232         drm_gem_object_put_unlocked(gobj);
 233
 234         return ret;
 235 }
 236
 237 static int mga_fbdev_destroy(struct drm_device *dev,
 238                                 struct mga_fbdev *mfbdev)
 239 {
 240         struct mga_framebuffer *mfb = &mfbdev->mfb;
 241
 242         drm_fb_helper_unregister_fbi(&mfbdev->helper);
 243
 244         if (mfb->obj) {
 245                 drm_gem_object_put_unlocked(mfb->obj);
 246                 mfb->obj = NULL;
 247         }
 248         drm_fb_helper_fini(&mfbdev->helper);
 249         vfree(mfbdev->sysram);
 250         drm_framebuffer_unregister_private(&mfb->base);
 251         drm_framebuffer_cleanup(&mfb->base);
 252
 253         return 0;
 254 }
 255
 256 static const struct drm_fb_helper_funcs mga_fb_helper_funcs = {
 257         .fb_probe = mgag200fb_create,
 258 };
 259
 260 int mgag200_fbdev_init(struct mga_device *mdev)
 261 {
 262         struct mga_fbdev *mfbdev;
 263         int ret;
 264         int bpp_sel = 32;
 265
 266         /* prefer 16bpp on low end gpus with limited VRAM */
 267         if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
 268                 bpp_sel = 16;
 269
 270         mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
 271         if (!mfbdev)
 272                 return -ENOMEM;
 273
 274         mdev->mfbdev = mfbdev;
 275         spin_lock_init(&mfbdev->dirty_lock);
 276
 277         drm_fb_helper_prepare(mdev->dev, &mfbdev->helper, &mga_fb_helper_funcs);
 278
 279         ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
 280                                  MGAG200FB_CONN_LIMIT);
 281         if (ret)
 282                 goto err_fb_helper;
 283
 284         ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
 285         if (ret)
 286                 goto err_fb_setup;
 287
 288         /* disable all the possible outputs/crtcs before entering KMS mode */
 289         drm_helper_disable_unused_functions(mdev->dev);
 290
 291         ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
 292         if (ret)
 293                 goto err_fb_setup;
 294
 295         return 0;
 296
 297 err_fb_setup:
 298         drm_fb_helper_fini(&mfbdev->helper);
 299 err_fb_helper:
 300         mdev->mfbdev = NULL;
 301
 302         return ret;
 303 }
 304
 305 void mgag200_fbdev_fini(struct mga_device *mdev)
 306 {
 307         if (!mdev->mfbdev)
 308                 return;
 309
 310         mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
 311 }