LXR linux/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#include <core/object.h>
  25
  26static u32
  27nvkm_ramht_hash(struct nvkm_ramht *ramht, int chid, u32 handle)
  28{
  29        u32 hash = 0;
  30
  31        while (handle) {
  32                hash ^= (handle & ((1 << ramht->bits) - 1));
  33                handle >>= ramht->bits;
  34        }
  35
  36        hash ^= chid << (ramht->bits - 4);
  37        return hash;
  38}
  39
  40struct nvkm_gpuobj *
  41nvkm_ramht_search(struct nvkm_ramht *ramht, int chid, u32 handle)
  42{
  43        u32 co, ho;
  44
  45        co = ho = nvkm_ramht_hash(ramht, chid, handle);
  46        do {
  47                if (ramht->data[co].chid == chid) {
  48                        if (ramht->data[co].handle == handle)
  49                                return ramht->data[co].inst;
  50                }
  51
  52                if (++co >= ramht->size)
  53                        co = 0;
  54        } while (co != ho);
  55
  56        return NULL;
  57}
  58
  59static int
  60nvkm_ramht_update(struct nvkm_ramht *ramht, int co, struct nvkm_object *object,
  61                  int chid, int addr, u32 handle, u32 context)
  62{
  63        struct nvkm_ramht_data *data = &ramht->data[co];
  64        u64 inst = 0x00000040; /* just non-zero for <=g8x fifo ramht */
  65        int ret;
  66
  67        nvkm_gpuobj_del(&data->inst);
  68        data->chid = chid;
  69        data->handle = handle;
  70
  71        if (object) {
  72                ret = nvkm_object_bind(object, ramht->parent, 16, &data->inst);
  73                if (ret) {
  74                        if (ret != -ENODEV) {
  75                                data->chid = -1;
  76                                return ret;
  77                        }
  78                        data->inst = NULL;
  79                }
  80
  81                if (data->inst) {
  82                        if (ramht->device->card_type >= NV_50)
  83                                inst = data->inst->node->offset;
  84                        else
  85                                inst = data->inst->addr;
  86                }
  87
  88                if (addr < 0) context |= inst << -addr;
  89                else          context |= inst >>  addr;
  90        }
  91
  92        nvkm_kmap(ramht->gpuobj);
  93        nvkm_wo32(ramht->gpuobj, (co << 3) + 0, handle);
  94        nvkm_wo32(ramht->gpuobj, (co << 3) + 4, context);
  95        nvkm_done(ramht->gpuobj);
  96        return co + 1;
  97}
  98
  99void
 100nvkm_ramht_remove(struct nvkm_ramht *ramht, int cookie)
 101{
 102        if (--cookie >= 0)
 103                nvkm_ramht_update(ramht, cookie, NULL, -1, 0, 0, 0);
 104}
 105
 106int
 107nvkm_ramht_insert(struct nvkm_ramht *ramht, struct nvkm_object *object,
 108                  int chid, int addr, u32 handle, u32 context)
 109{
 110        u32 co, ho;
 111
 112        if (nvkm_ramht_search(ramht, chid, handle))
 113                return -EEXIST;
 114
 115        co = ho = nvkm_ramht_hash(ramht, chid, handle);
 116        do {
 117                if (ramht->data[co].chid < 0) {
 118                        return nvkm_ramht_update(ramht, co, object, chid,
 119                                                 addr, handle, context);
 120                }
 121
 122                if (++co >= ramht->size)
 123                        co = 0;
 124        } while (co != ho);
 125
 126        return -ENOSPC;
 127}
 128
 129void
 130nvkm_ramht_del(struct nvkm_ramht **pramht)
 131{
 132        struct nvkm_ramht *ramht = *pramht;
 133        if (ramht) {
 134                nvkm_gpuobj_del(&ramht->gpuobj);
 135                vfree(*pramht);
 136                *pramht = NULL;
 137        }
 138}
 139
 140int
 141nvkm_ramht_new(struct nvkm_device *device, u32 size, u32 align,
 142               struct nvkm_gpuobj *parent, struct nvkm_ramht **pramht)
 143{
 144        struct nvkm_ramht *ramht;
 145        int ret, i;
 146
 147        if (!(ramht = *pramht = vzalloc(struct_size(ramht, data, (size >> 3)))))
 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}
 163