drivers/gpu/drm/nouveau/nvkm/core/ramht.c

   1 /*
   2  * Copyright 2012 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 #include <core/ramht.h>
  23 #include <core/engine.h>
  24
  25 static u32
  26 nvkm_ramht_hash(struct nvkm_ramht *ramht, int chid, u32 handle)
  27 {
  28         u32 hash = 0;
  29
  30         while (handle) {
  31                 hash ^= (handle & ((1 << ramht->bits) - 1));
  32                 handle >>= ramht->bits;
  33         }
  34
  35         hash ^= chid << (ramht->bits - 4);
  36         return hash;
  37 }
  38
  39 struct nvkm_gpuobj *
  40 nvkm_ramht_search(struct nvkm_ramht *ramht, int chid, u32 handle)
  41 {
  42         u32 co, ho;
  43
  44         co = ho = nvkm_ramht_hash(ramht, chid, handle);
  45         do {
  46                 if (ramht->data[co].chid == chid) {
  47                         if (ramht->data[co].handle == handle)
  48                                 return ramht->data[co].inst;
  49                 }
  50
  51                 if (++co >= ramht->size)
  52                         co = 0;
  53         } while (co != ho);
  54
  55         return NULL;
  56 }
  57
  58 static int
  59 nvkm_ramht_update(struct nvkm_ramht *ramht, int co, struct nvkm_object *object,
  60                   int chid, int addr, u32 handle, u32 context)
  61 {
  62         struct nvkm_ramht_data *data = &ramht->data[co];
  63         u64 inst = 0x00000040; /* just non-zero for <=g8x fifo ramht */
  64         int ret;
  65
  66         nvkm_gpuobj_del(&data->inst);
  67         data->chid = chid;
  68         data->handle = handle;
  69
  70         if (object) {
  71                 ret = nvkm_object_bind(object, ramht->parent, 16, &data->inst);
  72                 if (ret) {
  73                         if (ret != -ENODEV) {
  74                                 data->chid = -1;
  75                                 return ret;
  76                         }
  77                         data->inst = NULL;
  78                 }
  79
  80                 if (data->inst) {
  81                         if (ramht->device->card_type >= NV_50)
  82                                 inst = data->inst->node->offset;
  83                         else
  84                                 inst = data->inst->addr;
  85                 }
  86
  87                 if (addr < 0) context |= inst << -addr;
  88                 else          context |= inst >>  addr;
  89         }
  90
  91         nvkm_kmap(ramht->gpuobj);
  92         nvkm_wo32(ramht->gpuobj, (co << 3) + 0, handle);
  93         nvkm_wo32(ramht->gpuobj, (co << 3) + 4, context);
  94         nvkm_done(ramht->gpuobj);
  95         return co + 1;
  96 }
  97
  98 void
  99 nvkm_ramht_remove(struct nvkm_ramht *ramht, int cookie)
 100 {
 101         if (--cookie >= 0)
 102                 nvkm_ramht_update(ramht, cookie, NULL, -1, 0, 0, 0);
 103 }
 104
 105 int
 106 nvkm_ramht_insert(struct nvkm_ramht *ramht, struct nvkm_object *object,
 107                   int chid, int addr, u32 handle, u32 context)
 108 {
 109         u32 co, ho;
 110
 111         if (nvkm_ramht_search(ramht, chid, handle))
 112                 return -EEXIST;
 113
 114         co = ho = nvkm_ramht_hash(ramht, chid, handle);
 115         do {
 116                 if (ramht->data[co].chid < 0) {
 117                         return nvkm_ramht_update(ramht, co, object, chid,
 118                                                  addr, handle, context);
 119                 }
 120
 121                 if (++co >= ramht->size)
 122                         co = 0;
 123         } while (co != ho);
 124
 125         return -ENOSPC;
 126 }
 127
 128 void
 129 nvkm_ramht_del(struct nvkm_ramht **pramht)
 130 {
 131         struct nvkm_ramht *ramht = *pramht;
 132         if (ramht) {
 133                 nvkm_gpuobj_del(&ramht->gpuobj);
 134                 vfree(*pramht);
 135                 *pramht = NULL;
 136         }
 137 }
 138
 139 int
 140 nvkm_ramht_new(struct nvkm_device *device, u32 size, u32 align,
 141                struct nvkm_gpuobj *parent, struct nvkm_ramht **pramht)
 142 {
 143         struct nvkm_ramht *ramht;
 144         int ret, i;
 145
 146         if (!(ramht = *pramht = vzalloc(sizeof(*ramht) +
 147                                         (size >> 3) * sizeof(*ramht->data))))
 148                 return -ENOMEM;
 149
 150         ramht->device = device;
 151         ramht->parent = parent;
 152         ramht->size = size >> 3;
 153         ramht->bits = order_base_2(ramht->size);
 154         for (i = 0; i < ramht->size; i++)
 155                 ramht->data[i].chid = -1;
 156
 157         ret = nvkm_gpuobj_new(ramht->device, size, align, true,
 158                               ramht->parent, &ramht->gpuobj);
 159         if (ret)
 160                 nvkm_ramht_del(pramht);
 161         return ret;
 162 }