kernel/drivers/gpu/drm/nouveau/nvif/object.c

   1 /*
   2  * Copyright 2014 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 <bskeggs@redhat.com>
  23  */
  24
  25 #include <nvif/object.h>
  26 #include <nvif/client.h>
  27 #include <nvif/driver.h>
  28 #include <nvif/ioctl.h>
  29
  30 int
  31 nvif_object_ioctl(struct nvif_object *object, void *data, u32 size, void **hack)
  32 {
  33         struct nvif_client *client = nvif_client(object);
  34         union {
  35                 struct nvif_ioctl_v0 v0;
  36         } *args = data;
  37
  38         if (size >= sizeof(*args) && args->v0.version == 0) {
  39                 args->v0.owner = NVIF_IOCTL_V0_OWNER_ANY;
  40                 args->v0.path_nr = 0;
  41                 while (args->v0.path_nr < ARRAY_SIZE(args->v0.path)) {
  42                         args->v0.path[args->v0.path_nr++] = object->handle;
  43                         if (object->parent == object)
  44                                 break;
  45                         object = object->parent;
  46                 }
  47         } else
  48                 return -ENOSYS;
  49
  50         return client->driver->ioctl(client->base.priv, client->super, data, size, hack);
  51 }
  52
  53 int
  54 nvif_object_sclass(struct nvif_object *object, u32 *oclass, int count)
  55 {
  56         struct {
  57                 struct nvif_ioctl_v0 ioctl;
  58                 struct nvif_ioctl_sclass_v0 sclass;
  59         } *args;
  60         u32 size = count * sizeof(args->sclass.oclass[0]);
  61         int ret;
  62
  63         if (!(args = kmalloc(sizeof(*args) + size, GFP_KERNEL)))
  64                 return -ENOMEM;
  65         args->ioctl.version = 0;
  66         args->ioctl.type = NVIF_IOCTL_V0_SCLASS;
  67         args->sclass.version = 0;
  68         args->sclass.count = count;
  69
  70         memcpy(args->sclass.oclass, oclass, size);
  71         ret = nvif_object_ioctl(object, args, sizeof(*args) + size, NULL);
  72         ret = ret ? ret : args->sclass.count;
  73         memcpy(oclass, args->sclass.oclass, size);
  74         kfree(args);
  75         return ret;
  76 }
  77
  78 u32
  79 nvif_object_rd(struct nvif_object *object, int size, u64 addr)
  80 {
  81         struct {
  82                 struct nvif_ioctl_v0 ioctl;
  83                 struct nvif_ioctl_rd_v0 rd;
  84         } args = {
  85                 .ioctl.type = NVIF_IOCTL_V0_RD,
  86                 .rd.size = size,
  87                 .rd.addr = addr,
  88         };
  89         int ret = nvif_object_ioctl(object, &args, sizeof(args), NULL);
  90         if (ret) {
  91                 /*XXX: warn? */
  92                 return 0;
  93         }
  94         return args.rd.data;
  95 }
  96
  97 void
  98 nvif_object_wr(struct nvif_object *object, int size, u64 addr, u32 data)
  99 {
 100         struct {
 101                 struct nvif_ioctl_v0 ioctl;
 102                 struct nvif_ioctl_wr_v0 wr;
 103         } args = {
 104                 .ioctl.type = NVIF_IOCTL_V0_WR,
 105                 .wr.size = size,
 106                 .wr.addr = addr,
 107                 .wr.data = data,
 108         };
 109         int ret = nvif_object_ioctl(object, &args, sizeof(args), NULL);
 110         if (ret) {
 111                 /*XXX: warn? */
 112         }
 113 }
 114
 115 int
 116 nvif_object_mthd(struct nvif_object *object, u32 mthd, void *data, u32 size)
 117 {
 118         struct {
 119                 struct nvif_ioctl_v0 ioctl;
 120                 struct nvif_ioctl_mthd_v0 mthd;
 121         } *args;
 122         u8 stack[128];
 123         int ret;
 124
 125         if (sizeof(*args) + size > sizeof(stack)) {
 126                 if (!(args = kmalloc(sizeof(*args) + size, GFP_KERNEL)))
 127                         return -ENOMEM;
 128         } else {
 129                 args = (void *)stack;
 130         }
 131         args->ioctl.version = 0;
 132         args->ioctl.type = NVIF_IOCTL_V0_MTHD;
 133         args->mthd.version = 0;
 134         args->mthd.method = mthd;
 135
 136         memcpy(args->mthd.data, data, size);
 137         ret = nvif_object_ioctl(object, args, sizeof(*args) + size, NULL);
 138         memcpy(data, args->mthd.data, size);
 139         if (args != (void *)stack)
 140                 kfree(args);
 141         return ret;
 142 }
 143
 144 void
 145 nvif_object_unmap(struct nvif_object *object)
 146 {
 147         if (object->map.size) {
 148                 struct nvif_client *client = nvif_client(object);
 149                 struct {
 150                         struct nvif_ioctl_v0 ioctl;
 151                         struct nvif_ioctl_unmap unmap;
 152                 } args = {
 153                         .ioctl.type = NVIF_IOCTL_V0_UNMAP,
 154                 };
 155
 156                 if (object->map.ptr) {
 157                         client->driver->unmap(client, object->map.ptr,
 158                                                       object->map.size);
 159                         object->map.ptr = NULL;
 160                 }
 161
 162                 nvif_object_ioctl(object, &args, sizeof(args), NULL);
 163                 object->map.size = 0;
 164         }
 165 }
 166
 167 int
 168 nvif_object_map(struct nvif_object *object)
 169 {
 170         struct nvif_client *client = nvif_client(object);
 171         struct {
 172                 struct nvif_ioctl_v0 ioctl;
 173                 struct nvif_ioctl_map_v0 map;
 174         } args = {
 175                 .ioctl.type = NVIF_IOCTL_V0_MAP,
 176         };
 177         int ret = nvif_object_ioctl(object, &args, sizeof(args), NULL);
 178         if (ret == 0) {
 179                 object->map.size = args.map.length;
 180                 object->map.ptr = client->driver->map(client, args.map.handle,
 181                                                       object->map.size);
 182                 if (ret = -ENOMEM, object->map.ptr)
 183                         return 0;
 184                 nvif_object_unmap(object);
 185         }
 186         return ret;
 187 }
 188
 189 struct ctor {
 190         struct nvif_ioctl_v0 ioctl;
 191         struct nvif_ioctl_new_v0 new;
 192 };
 193
 194 void
 195 nvif_object_fini(struct nvif_object *object)
 196 {
 197         struct ctor *ctor = container_of(object->data, typeof(*ctor), new.data);
 198         if (object->parent) {
 199                 struct {
 200                         struct nvif_ioctl_v0 ioctl;
 201                         struct nvif_ioctl_del del;
 202                 } args = {
 203                         .ioctl.type = NVIF_IOCTL_V0_DEL,
 204                 };
 205
 206                 nvif_object_unmap(object);
 207                 nvif_object_ioctl(object, &args, sizeof(args), NULL);
 208                 if (object->data) {
 209                         object->size = 0;
 210                         object->data = NULL;
 211                         kfree(ctor);
 212                 }
 213                 nvif_object_ref(NULL, &object->parent);
 214         }
 215 }
 216
 217 int
 218 nvif_object_init(struct nvif_object *parent, void (*dtor)(struct nvif_object *),
 219                  u32 handle, u32 oclass, void *data, u32 size,
 220                  struct nvif_object *object)
 221 {
 222         struct ctor *ctor;
 223         int ret = 0;
 224
 225         object->parent = NULL;
 226         object->object = object;
 227         nvif_object_ref(parent, &object->parent);
 228         kref_init(&object->refcount);
 229         object->handle = handle;
 230         object->oclass = oclass;
 231         object->data = NULL;
 232         object->size = 0;
 233         object->dtor = dtor;
 234         object->map.ptr = NULL;
 235         object->map.size = 0;
 236
 237         if (object->parent) {
 238                 if (!(ctor = kmalloc(sizeof(*ctor) + size, GFP_KERNEL))) {
 239                         nvif_object_fini(object);
 240                         return -ENOMEM;
 241                 }
 242                 object->data = ctor->new.data;
 243                 object->size = size;
 244                 memcpy(object->data, data, size);
 245
 246                 ctor->ioctl.version = 0;
 247                 ctor->ioctl.type = NVIF_IOCTL_V0_NEW;
 248                 ctor->new.version = 0;
 249                 ctor->new.route = NVIF_IOCTL_V0_ROUTE_NVIF;
 250                 ctor->new.token = (unsigned long)(void *)object;
 251                 ctor->new.handle = handle;
 252                 ctor->new.oclass = oclass;
 253
 254                 ret = nvif_object_ioctl(parent, ctor, sizeof(*ctor) +
 255                                         object->size, &object->priv);
 256         }
 257
 258         if (ret)
 259                 nvif_object_fini(object);
 260         return ret;
 261 }
 262
 263 static void
 264 nvif_object_del(struct nvif_object *object)
 265 {
 266         nvif_object_fini(object);
 267         kfree(object);
 268 }
 269
 270 int
 271 nvif_object_new(struct nvif_object *parent, u32 handle, u32 oclass,
 272                 void *data, u32 size, struct nvif_object **pobject)
 273 {
 274         struct nvif_object *object = kzalloc(sizeof(*object), GFP_KERNEL);
 275         if (object) {
 276                 int ret = nvif_object_init(parent, nvif_object_del, handle,
 277                                            oclass, data, size, object);
 278                 if (ret) {
 279                         kfree(object);
 280                         object = NULL;
 281                 }
 282                 *pobject = object;
 283                 return ret;
 284         }
 285         return -ENOMEM;
 286 }
 287
 288 static void
 289 nvif_object_put(struct kref *kref)
 290 {
 291         struct nvif_object *object =
 292                 container_of(kref, typeof(*object), refcount);
 293         object->dtor(object);
 294 }
 295
 296 void
 297 nvif_object_ref(struct nvif_object *object, struct nvif_object **pobject)
 298 {
 299         if (object)
 300                 kref_get(&object->refcount);
 301         if (*pobject)
 302                 kref_put(&(*pobject)->refcount, nvif_object_put);
 303         *pobject = object;
 304 }