drivers/gpu/drm/drm_drawable.c

   1 /**
   2  * \file drm_drawable.c
   3  * IOCTLs for drawables
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  * \author Michel Dänzer <michel@tungstengraphics.com>
   8  */
   9
  10 /*
  11  * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
  12  *
  13  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  14  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  15  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, North Dakota.
  16  * All Rights Reserved.
  17  *
  18  * Permission is hereby granted, free of charge, to any person obtaining a
  19  * copy of this software and associated documentation files (the "Software"),
  20  * to deal in the Software without restriction, including without limitation
  21  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  22  * and/or sell copies of the Software, and to permit persons to whom the
  23  * Software is furnished to do so, subject to the following conditions:
  24  *
  25  * The above copyright notice and this permission notice (including the next
  26  * paragraph) shall be included in all copies or substantial portions of the
  27  * Software.
  28  *
  29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  30  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  31  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  32  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  33  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  34  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  35  * OTHER DEALINGS IN THE SOFTWARE.
  36  */
  37
  38 #include "drmP.h"
  39
  40 /**
  41  * Allocate drawable ID and memory to store information about it.
  42  */
  43 int drm_adddraw(struct drm_device *dev, void *data, struct drm_file *file_priv)
  44 {
  45         unsigned long irqflags;
  46         struct drm_draw *draw = data;
  47         int new_id = 0;
  48         int ret;
  49
  50 again:
  51         if (idr_pre_get(&dev->drw_idr, GFP_KERNEL) == 0) {
  52                 DRM_ERROR("Out of memory expanding drawable idr\n");
  53                 return -ENOMEM;
  54         }
  55
  56         spin_lock_irqsave(&dev->drw_lock, irqflags);
  57         ret = idr_get_new_above(&dev->drw_idr, NULL, 1, &new_id);
  58         if (ret == -EAGAIN) {
  59                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  60                 goto again;
  61         }
  62
  63         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  64
  65         draw->handle = new_id;
  66
  67         DRM_DEBUG("%d\n", draw->handle);
  68
  69         return 0;
  70 }
  71
  72 /**
  73  * Free drawable ID and memory to store information about it.
  74  */
  75 int drm_rmdraw(struct drm_device *dev, void *data, struct drm_file *file_priv)
  76 {
  77         struct drm_draw *draw = data;
  78         unsigned long irqflags;
  79         struct drm_drawable_info *info;
  80
  81         spin_lock_irqsave(&dev->drw_lock, irqflags);
  82
  83         info = drm_get_drawable_info(dev, draw->handle);
  84         drm_free(info->rects, info->num_rects * sizeof(struct drm_clip_rect),
  85                         DRM_MEM_BUFS);
  86         drm_free(info, sizeof(struct drm_drawable_info), DRM_MEM_BUFS);
  87
  88         idr_remove(&dev->drw_idr, draw->handle);
  89
  90         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
  91         DRM_DEBUG("%d\n", draw->handle);
  92         return 0;
  93 }
  94
  95 int drm_update_drawable_info(struct drm_device *dev, void *data, struct drm_file *file_priv)
  96 {
  97         struct drm_update_draw *update = data;
  98         unsigned long irqflags;
  99         struct drm_clip_rect *rects;
 100         struct drm_drawable_info *info;
 101         int err;
 102
 103         info = idr_find(&dev->drw_idr, update->handle);
 104         if (!info) {
 105                 info = drm_calloc(1, sizeof(*info), DRM_MEM_BUFS);
 106                 if (!info)
 107                         return -ENOMEM;
 108                 if (IS_ERR(idr_replace(&dev->drw_idr, info, update->handle))) {
 109                         DRM_ERROR("No such drawable %d\n", update->handle);
 110                         drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 111                         return -EINVAL;
 112                 }
 113         }
 114
 115         switch (update->type) {
 116         case DRM_DRAWABLE_CLIPRECTS:
 117                 if (update->num == 0)
 118                         rects = NULL;
 119                 else if (update->num != info->num_rects) {
 120                         rects = drm_alloc(update->num * sizeof(struct drm_clip_rect),
 121                                          DRM_MEM_BUFS);
 122                 } else
 123                         rects = info->rects;
 124
 125                 if (update->num && !rects) {
 126                         DRM_ERROR("Failed to allocate cliprect memory\n");
 127                         err = -ENOMEM;
 128                         goto error;
 129                 }
 130
 131                 if (update->num && DRM_COPY_FROM_USER(rects,
 132                                                      (struct drm_clip_rect __user *)
 133                                                      (unsigned long)update->data,
 134                                                      update->num *
 135                                                      sizeof(*rects))) {
 136                         DRM_ERROR("Failed to copy cliprects from userspace\n");
 137                         err = -EFAULT;
 138                         goto error;
 139                 }
 140
 141                 spin_lock_irqsave(&dev->drw_lock, irqflags);
 142
 143                 if (rects != info->rects) {
 144                         drm_free(info->rects, info->num_rects *
 145                                  sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 146                 }
 147
 148                 info->rects = rects;
 149                 info->num_rects = update->num;
 150
 151                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 152
 153                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
 154                           info->num_rects, update->handle);
 155                 break;
 156         default:
 157                 DRM_ERROR("Invalid update type %d\n", update->type);
 158                 return -EINVAL;
 159         }
 160
 161         return 0;
 162
 163 error:
 164         if (rects != info->rects)
 165                 drm_free(rects, update->num * sizeof(struct drm_clip_rect),
 166                          DRM_MEM_BUFS);
 167
 168         return err;
 169 }
 170
 171 /**
 172  * Caller must hold the drawable spinlock!
 173  */
 174 struct drm_drawable_info *drm_get_drawable_info(struct drm_device *dev, drm_drawable_t id)
 175 {
 176         return idr_find(&dev->drw_idr, id);
 177 }
 178 EXPORT_SYMBOL(drm_get_drawable_info);
 179
 180 static int drm_drawable_free(int idr, void *p, void *data)
 181 {
 182         struct drm_drawable_info *info = p;
 183
 184         if (info) {
 185                 drm_free(info->rects, info->num_rects *
 186                          sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 187                 drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 188         }
 189
 190         return 0;
 191 }
 192
 193 void drm_drawable_free_all(struct drm_device *dev)
 194 {
 195         idr_for_each(&dev->drw_idr, drm_drawable_free, NULL);
 196         idr_remove_all(&dev->drw_idr);
 197 }