drivers/gpu/drm/nouveau/nouveau_ramht.c

   1 /*
   2  * Copyright 2010 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24
  25 #include "drmP.h"
  26
  27 #include "nouveau_drv.h"
  28 #include "nouveau_ramht.h"
  29
  30 static u32
  31 nouveau_ramht_hash_handle(struct nouveau_channel *chan, u32 handle)
  32 {
  33         struct drm_device *dev = chan->dev;
  34         struct drm_nouveau_private *dev_priv = dev->dev_private;
  35         struct nouveau_ramht *ramht = chan->ramht;
  36         u32 hash = 0;
  37         int i;
  38
  39         NV_DEBUG(dev, "ch%d handle=0x%08x\n", chan->id, handle);
  40
  41         for (i = 32; i > 0; i -= ramht->bits) {
  42                 hash ^= (handle & ((1 << ramht->bits) - 1));
  43                 handle >>= ramht->bits;
  44         }
  45
  46         if (dev_priv->card_type < NV_50)
  47                 hash ^= chan->id << (ramht->bits - 4);
  48         hash <<= 3;
  49
  50         NV_DEBUG(dev, "hash=0x%08x\n", hash);
  51         return hash;
  52 }
  53
  54 static int
  55 nouveau_ramht_entry_valid(struct drm_device *dev, struct nouveau_gpuobj *ramht,
  56                           u32 offset)
  57 {
  58         struct drm_nouveau_private *dev_priv = dev->dev_private;
  59         u32 ctx = nv_ro32(ramht, offset + 4);
  60
  61         if (dev_priv->card_type < NV_40)
  62                 return ((ctx & NV_RAMHT_CONTEXT_VALID) != 0);
  63         return (ctx != 0);
  64 }
  65
  66 static int
  67 nouveau_ramht_entry_same_channel(struct nouveau_channel *chan,
  68                                  struct nouveau_gpuobj *ramht, u32 offset)
  69 {
  70         struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
  71         u32 ctx = nv_ro32(ramht, offset + 4);
  72
  73         if (dev_priv->card_type >= NV_50)
  74                 return true;
  75         else if (dev_priv->card_type >= NV_40)
  76                 return chan->id ==
  77                         ((ctx >> NV40_RAMHT_CONTEXT_CHANNEL_SHIFT) & 0x1f);
  78         else
  79                 return chan->id ==
  80                         ((ctx >> NV_RAMHT_CONTEXT_CHANNEL_SHIFT) & 0x1f);
  81 }
  82
  83 int
  84 nouveau_ramht_insert(struct nouveau_channel *chan, u32 handle,
  85                      struct nouveau_gpuobj *gpuobj)
  86 {
  87         struct drm_device *dev = chan->dev;
  88         struct drm_nouveau_private *dev_priv = dev->dev_private;
  89         struct nouveau_instmem_engine *instmem = &dev_priv->engine.instmem;
  90         struct nouveau_ramht_entry *entry;
  91         struct nouveau_gpuobj *ramht = chan->ramht->gpuobj;
  92         unsigned long flags;
  93         u32 ctx, co, ho;
  94
  95         if (nouveau_ramht_find(chan, handle))
  96                 return -EEXIST;
  97
  98         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
  99         if (!entry)
 100                 return -ENOMEM;
 101         entry->channel = chan;
 102         entry->gpuobj = NULL;
 103         entry->handle = handle;
 104         nouveau_gpuobj_ref(gpuobj, &entry->gpuobj);
 105
 106         if (dev_priv->card_type < NV_40) {
 107                 ctx = NV_RAMHT_CONTEXT_VALID | (gpuobj->cinst >> 4) |
 108                       (chan->id << NV_RAMHT_CONTEXT_CHANNEL_SHIFT) |
 109                       (gpuobj->engine << NV_RAMHT_CONTEXT_ENGINE_SHIFT);
 110         } else
 111         if (dev_priv->card_type < NV_50) {
 112                 ctx = (gpuobj->cinst >> 4) |
 113                       (chan->id << NV40_RAMHT_CONTEXT_CHANNEL_SHIFT) |
 114                       (gpuobj->engine << NV40_RAMHT_CONTEXT_ENGINE_SHIFT);
 115         } else {
 116                 if (gpuobj->engine == NVOBJ_ENGINE_DISPLAY) {
 117                         ctx = (gpuobj->cinst << 10) | 2;
 118                 } else {
 119                         ctx = (gpuobj->cinst >> 4) |
 120                               ((gpuobj->engine <<
 121                                 NV40_RAMHT_CONTEXT_ENGINE_SHIFT));
 122                 }
 123         }
 124
 125         spin_lock_irqsave(&chan->ramht->lock, flags);
 126         list_add(&entry->head, &chan->ramht->entries);
 127
 128         co = ho = nouveau_ramht_hash_handle(chan, handle);
 129         do {
 130                 if (!nouveau_ramht_entry_valid(dev, ramht, co)) {
 131                         NV_DEBUG(dev,
 132                                  "insert ch%d 0x%08x: h=0x%08x, c=0x%08x\n",
 133                                  chan->id, co, handle, ctx);
 134                         nv_wo32(ramht, co + 0, handle);
 135                         nv_wo32(ramht, co + 4, ctx);
 136
 137                         spin_unlock_irqrestore(&chan->ramht->lock, flags);
 138                         instmem->flush(dev);
 139                         return 0;
 140                 }
 141                 NV_DEBUG(dev, "collision ch%d 0x%08x: h=0x%08x\n",
 142                          chan->id, co, nv_ro32(ramht, co));
 143
 144                 co += 8;
 145                 if (co >= ramht->size)
 146                         co = 0;
 147         } while (co != ho);
 148
 149         NV_ERROR(dev, "RAMHT space exhausted. ch=%d\n", chan->id);
 150         list_del(&entry->head);
 151         spin_unlock_irqrestore(&chan->ramht->lock, flags);
 152         kfree(entry);
 153         return -ENOMEM;
 154 }
 155
 156 static void
 157 nouveau_ramht_remove_locked(struct nouveau_channel *chan, u32 handle)
 158 {
 159         struct drm_device *dev = chan->dev;
 160         struct drm_nouveau_private *dev_priv = dev->dev_private;
 161         struct nouveau_instmem_engine *instmem = &dev_priv->engine.instmem;
 162         struct nouveau_gpuobj *ramht = chan->ramht->gpuobj;
 163         struct nouveau_ramht_entry *entry, *tmp;
 164         u32 co, ho;
 165
 166         list_for_each_entry_safe(entry, tmp, &chan->ramht->entries, head) {
 167                 if (entry->channel != chan || entry->handle != handle)
 168                         continue;
 169
 170                 nouveau_gpuobj_ref(NULL, &entry->gpuobj);
 171                 list_del(&entry->head);
 172                 kfree(entry);
 173                 break;
 174         }
 175
 176         co = ho = nouveau_ramht_hash_handle(chan, handle);
 177         do {
 178                 if (nouveau_ramht_entry_valid(dev, ramht, co) &&
 179                     nouveau_ramht_entry_same_channel(chan, ramht, co) &&
 180                     (handle == nv_ro32(ramht, co))) {
 181                         NV_DEBUG(dev,
 182                                  "remove ch%d 0x%08x: h=0x%08x, c=0x%08x\n",
 183                                  chan->id, co, handle, nv_ro32(ramht, co + 4));
 184                         nv_wo32(ramht, co + 0, 0x00000000);
 185                         nv_wo32(ramht, co + 4, 0x00000000);
 186                         instmem->flush(dev);
 187                         return;
 188                 }
 189
 190                 co += 8;
 191                 if (co >= ramht->size)
 192                         co = 0;
 193         } while (co != ho);
 194
 195         NV_ERROR(dev, "RAMHT entry not found. ch=%d, handle=0x%08x\n",
 196                  chan->id, handle);
 197 }
 198
 199 void
 200 nouveau_ramht_remove(struct nouveau_channel *chan, u32 handle)
 201 {
 202         struct nouveau_ramht *ramht = chan->ramht;
 203         unsigned long flags;
 204
 205         spin_lock_irqsave(&ramht->lock, flags);
 206         nouveau_ramht_remove_locked(chan, handle);
 207         spin_unlock_irqrestore(&ramht->lock, flags);
 208 }
 209
 210 struct nouveau_gpuobj *
 211 nouveau_ramht_find(struct nouveau_channel *chan, u32 handle)
 212 {
 213         struct nouveau_ramht *ramht = chan->ramht;
 214         struct nouveau_ramht_entry *entry;
 215         struct nouveau_gpuobj *gpuobj = NULL;
 216         unsigned long flags;
 217
 218         if (unlikely(!chan->ramht))
 219                 return NULL;
 220
 221         spin_lock_irqsave(&ramht->lock, flags);
 222         list_for_each_entry(entry, &chan->ramht->entries, head) {
 223                 if (entry->channel == chan && entry->handle == handle) {
 224                         gpuobj = entry->gpuobj;
 225                         break;
 226                 }
 227         }
 228         spin_unlock_irqrestore(&ramht->lock, flags);
 229
 230         return gpuobj;
 231 }
 232
 233 int
 234 nouveau_ramht_new(struct drm_device *dev, struct nouveau_gpuobj *gpuobj,
 235                   struct nouveau_ramht **pramht)
 236 {
 237         struct nouveau_ramht *ramht;
 238
 239         ramht = kzalloc(sizeof(*ramht), GFP_KERNEL);
 240         if (!ramht)
 241                 return -ENOMEM;
 242
 243         ramht->dev = dev;
 244         kref_init(&ramht->refcount);
 245         ramht->bits = drm_order(gpuobj->size / 8);
 246         INIT_LIST_HEAD(&ramht->entries);
 247         spin_lock_init(&ramht->lock);
 248         nouveau_gpuobj_ref(gpuobj, &ramht->gpuobj);
 249
 250         *pramht = ramht;
 251         return 0;
 252 }
 253
 254 static void
 255 nouveau_ramht_del(struct kref *ref)
 256 {
 257         struct nouveau_ramht *ramht =
 258                 container_of(ref, struct nouveau_ramht, refcount);
 259
 260         nouveau_gpuobj_ref(NULL, &ramht->gpuobj);
 261         kfree(ramht);
 262 }
 263
 264 void
 265 nouveau_ramht_ref(struct nouveau_ramht *ref, struct nouveau_ramht **ptr,
 266                   struct nouveau_channel *chan)
 267 {
 268         struct nouveau_ramht_entry *entry, *tmp;
 269         struct nouveau_ramht *ramht;
 270         unsigned long flags;
 271
 272         if (ref)
 273                 kref_get(&ref->refcount);
 274
 275         ramht = *ptr;
 276         if (ramht) {
 277                 spin_lock_irqsave(&ramht->lock, flags);
 278                 list_for_each_entry_safe(entry, tmp, &ramht->entries, head) {
 279                         if (entry->channel != chan)
 280                                 continue;
 281
 282                         nouveau_ramht_remove_locked(chan, entry->handle);
 283                 }
 284                 spin_unlock_irqrestore(&ramht->lock, flags);
 285
 286                 kref_put(&ramht->refcount, nouveau_ramht_del);
 287         }
 288         *ptr = ref;
 289 }