LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/uvmm.c

   1/*
   2 * Copyright 2017 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 "uvmm.h"
  23#include "umem.h"
  24#include "ummu.h"
  25
  26#include <core/client.h>
  27#include <core/memory.h>
  28
  29#include <nvif/if000c.h>
  30#include <nvif/unpack.h>
  31
  32static const struct nvkm_object_func nvkm_uvmm;
  33struct nvkm_vmm *
  34nvkm_uvmm_search(struct nvkm_client *client, u64 handle)
  35{
  36        struct nvkm_object *object;
  37
  38        object = nvkm_object_search(client, handle, &nvkm_uvmm);
  39        if (IS_ERR(object))
  40                return (void *)object;
  41
  42        return nvkm_uvmm(object)->vmm;
  43}
  44
  45static int
  46nvkm_uvmm_mthd_unmap(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
  47{
  48        struct nvkm_client *client = uvmm->object.client;
  49        union {
  50                struct nvif_vmm_unmap_v0 v0;
  51        } *args = argv;
  52        struct nvkm_vmm *vmm = uvmm->vmm;
  53        struct nvkm_vma *vma;
  54        int ret = -ENOSYS;
  55        u64 addr;
  56
  57        if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
  58                addr = args->v0.addr;
  59        } else
  60                return ret;
  61
  62        mutex_lock(&vmm->mutex);
  63        vma = nvkm_vmm_node_search(vmm, addr);
  64        if (ret = -ENOENT, !vma || vma->addr != addr) {
  65                VMM_DEBUG(vmm, "lookup %016llx: %016llx",
  66                          addr, vma ? vma->addr : ~0ULL);
  67                goto done;
  68        }
  69
  70        if (ret = -ENOENT, (!vma->user && !client->super) || vma->busy) {
  71                VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
  72                          vma->user, !client->super, vma->busy);
  73                goto done;
  74        }
  75
  76        if (ret = -EINVAL, !vma->memory) {
  77                VMM_DEBUG(vmm, "unmapped");
  78                goto done;
  79        }
  80
  81        nvkm_vmm_unmap_locked(vmm, vma);
  82        ret = 0;
  83done:
  84        mutex_unlock(&vmm->mutex);
  85        return ret;
  86}
  87
  88static int
  89nvkm_uvmm_mthd_map(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
  90{
  91        struct nvkm_client *client = uvmm->object.client;
  92        union {
  93                struct nvif_vmm_map_v0 v0;
  94        } *args = argv;
  95        u64 addr, size, handle, offset;
  96        struct nvkm_vmm *vmm = uvmm->vmm;
  97        struct nvkm_vma *vma;
  98        struct nvkm_memory *memory;
  99        int ret = -ENOSYS;
 100
 101        if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, true))) {
 102                addr = args->v0.addr;
 103                size = args->v0.size;
 104                handle = args->v0.memory;
 105                offset = args->v0.offset;
 106        } else
 107                return ret;
 108
 109        memory = nvkm_umem_search(client, handle);
 110        if (IS_ERR(memory)) {
 111                VMM_DEBUG(vmm, "memory %016llx %ld\n", handle, PTR_ERR(memory));
 112                return PTR_ERR(memory);
 113        }
 114
 115        mutex_lock(&vmm->mutex);
 116        if (ret = -ENOENT, !(vma = nvkm_vmm_node_search(vmm, addr))) {
 117                VMM_DEBUG(vmm, "lookup %016llx", addr);
 118                goto fail;
 119        }
 120
 121        if (ret = -ENOENT, (!vma->user && !client->super) || vma->busy) {
 122                VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
 123                          vma->user, !client->super, vma->busy);
 124                goto fail;
 125        }
 126
 127        if (ret = -EINVAL, vma->addr != addr || vma->size != size) {
 128                if (addr + size > vma->addr + vma->size || vma->memory ||
 129                    (vma->refd == NVKM_VMA_PAGE_NONE && !vma->mapref)) {
 130                        VMM_DEBUG(vmm, "split %d %d %d "
 131                                       "%016llx %016llx %016llx %016llx",
 132                                  !!vma->memory, vma->refd, vma->mapref,
 133                                  addr, size, vma->addr, (u64)vma->size);
 134                        goto fail;
 135                }
 136
 137                if (vma->addr != addr) {
 138                        const u64 tail = vma->size + vma->addr - addr;
 139                        if (ret = -ENOMEM, !(vma = nvkm_vma_tail(vma, tail)))
 140                                goto fail;
 141                        vma->part = true;
 142                        nvkm_vmm_node_insert(vmm, vma);
 143                }
 144
 145                if (vma->size != size) {
 146                        const u64 tail = vma->size - size;
 147                        struct nvkm_vma *tmp;
 148                        if (ret = -ENOMEM, !(tmp = nvkm_vma_tail(vma, tail))) {
 149                                nvkm_vmm_unmap_region(vmm, vma);
 150                                goto fail;
 151                        }
 152                        tmp->part = true;
 153                        nvkm_vmm_node_insert(vmm, tmp);
 154                }
 155        }
 156        vma->busy = true;
 157        mutex_unlock(&vmm->mutex);
 158
 159        ret = nvkm_memory_map(memory, offset, vmm, vma, argv, argc);
 160        if (ret == 0) {
 161                /* Successful map will clear vma->busy. */
 162                nvkm_memory_unref(&memory);
 163                return 0;
 164        }
 165
 166        mutex_lock(&vmm->mutex);
 167        vma->busy = false;
 168        nvkm_vmm_unmap_region(vmm, vma);
 169fail:
 170        mutex_unlock(&vmm->mutex);
 171        nvkm_memory_unref(&memory);
 172        return ret;
 173}
 174
 175static int
 176nvkm_uvmm_mthd_put(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
 177{
 178        struct nvkm_client *client = uvmm->object.client;
 179        union {
 180                struct nvif_vmm_put_v0 v0;
 181        } *args = argv;
 182        struct nvkm_vmm *vmm = uvmm->vmm;
 183        struct nvkm_vma *vma;
 184        int ret = -ENOSYS;
 185        u64 addr;
 186
 187        if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
 188                addr = args->v0.addr;
 189        } else
 190                return ret;
 191
 192        mutex_lock(&vmm->mutex);
 193        vma = nvkm_vmm_node_search(vmm, args->v0.addr);
 194        if (ret = -ENOENT, !vma || vma->addr != addr || vma->part) {
 195                VMM_DEBUG(vmm, "lookup %016llx: %016llx %d", addr,
 196                          vma ? vma->addr : ~0ULL, vma ? vma->part : 0);
 197                goto done;
 198        }
 199
 200        if (ret = -ENOENT, (!vma->user && !client->super) || vma->busy) {
 201                VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
 202                          vma->user, !client->super, vma->busy);
 203                goto done;
 204        }
 205
 206        nvkm_vmm_put_locked(vmm, vma);
 207        ret = 0;
 208done:
 209        mutex_unlock(&vmm->mutex);
 210        return ret;
 211}
 212
 213static int
 214nvkm_uvmm_mthd_get(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
 215{
 216        struct nvkm_client *client = uvmm->object.client;
 217        union {
 218                struct nvif_vmm_get_v0 v0;
 219        } *args = argv;
 220        struct nvkm_vmm *vmm = uvmm->vmm;
 221        struct nvkm_vma *vma;
 222        int ret = -ENOSYS;
 223        bool getref, mapref, sparse;
 224        u8 page, align;
 225        u64 size;
 226
 227        if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
 228                getref = args->v0.type == NVIF_VMM_GET_V0_PTES;
 229                mapref = args->v0.type == NVIF_VMM_GET_V0_ADDR;
 230                sparse = args->v0.sparse;
 231                page = args->v0.page;
 232                align = args->v0.align;
 233                size = args->v0.size;
 234        } else
 235                return ret;
 236
 237        mutex_lock(&vmm->mutex);
 238        ret = nvkm_vmm_get_locked(vmm, getref, mapref, sparse,
 239                                  page, align, size, &vma);
 240        mutex_unlock(&vmm->mutex);
 241        if (ret)
 242                return ret;
 243
 244        args->v0.addr = vma->addr;
 245        vma->user = !client->super;
 246        return ret;
 247}
 248
 249static int
 250nvkm_uvmm_mthd_page(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
 251{
 252        union {
 253                struct nvif_vmm_page_v0 v0;
 254        } *args = argv;
 255        const struct nvkm_vmm_page *page;
 256        int ret = -ENOSYS;
 257        u8 type, index, nr;
 258
 259        page = uvmm->vmm->func->page;
 260        for (nr = 0; page[nr].shift; nr++);
 261
 262        if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
 263                if ((index = args->v0.index) >= nr)
 264                        return -EINVAL;
 265                type = page[index].type;
 266                args->v0.shift = page[index].shift;
 267                args->v0.sparse = !!(type & NVKM_VMM_PAGE_SPARSE);
 268                args->v0.vram = !!(type & NVKM_VMM_PAGE_VRAM);
 269                args->v0.host = !!(type & NVKM_VMM_PAGE_HOST);
 270                args->v0.comp = !!(type & NVKM_VMM_PAGE_COMP);
 271        } else
 272                return -ENOSYS;
 273
 274        return 0;
 275}
 276
 277static int
 278nvkm_uvmm_mthd(struct nvkm_object *object, u32 mthd, void *argv, u32 argc)
 279{
 280        struct nvkm_uvmm *uvmm = nvkm_uvmm(object);
 281        switch (mthd) {
 282        case NVIF_VMM_V0_PAGE  : return nvkm_uvmm_mthd_page  (uvmm, argv, argc);
 283        case NVIF_VMM_V0_GET   : return nvkm_uvmm_mthd_get   (uvmm, argv, argc);
 284        case NVIF_VMM_V0_PUT   : return nvkm_uvmm_mthd_put   (uvmm, argv, argc);
 285        case NVIF_VMM_V0_MAP   : return nvkm_uvmm_mthd_map   (uvmm, argv, argc);
 286        case NVIF_VMM_V0_UNMAP : return nvkm_uvmm_mthd_unmap (uvmm, argv, argc);
 287        default:
 288                break;
 289        }
 290        return -EINVAL;
 291}
 292
 293static void *
 294nvkm_uvmm_dtor(struct nvkm_object *object)
 295{
 296        struct nvkm_uvmm *uvmm = nvkm_uvmm(object);
 297        nvkm_vmm_unref(&uvmm->vmm);
 298        return uvmm;
 299}
 300
 301static const struct nvkm_object_func
 302nvkm_uvmm = {
 303        .dtor = nvkm_uvmm_dtor,
 304        .mthd = nvkm_uvmm_mthd,
 305};
 306
 307int
 308nvkm_uvmm_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
 309              struct nvkm_object **pobject)
 310{
 311        struct nvkm_mmu *mmu = nvkm_ummu(oclass->parent)->mmu;
 312        const bool more = oclass->base.maxver >= 0;
 313        union {
 314                struct nvif_vmm_v0 v0;
 315        } *args = argv;
 316        const struct nvkm_vmm_page *page;
 317        struct nvkm_uvmm *uvmm;
 318        int ret = -ENOSYS;
 319        u64 addr, size;
 320
 321        if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, more))) {
 322                addr = args->v0.addr;
 323                size = args->v0.size;
 324        } else
 325                return ret;
 326
 327        if (!(uvmm = kzalloc(sizeof(*uvmm), GFP_KERNEL)))
 328                return -ENOMEM;
 329        nvkm_object_ctor(&nvkm_uvmm, oclass, &uvmm->object);
 330        *pobject = &uvmm->object;
 331
 332        if (!mmu->vmm) {
 333                ret = mmu->func->vmm.ctor(mmu, addr, size, argv, argc,
 334                                          NULL, "user", &uvmm->vmm);
 335                if (ret)
 336                        return ret;
 337
 338                uvmm->vmm->debug = max(uvmm->vmm->debug, oclass->client->debug);
 339        } else {
 340                if (size)
 341                        return -EINVAL;
 342
 343                uvmm->vmm = nvkm_vmm_ref(mmu->vmm);
 344        }
 345
 346        page = uvmm->vmm->func->page;
 347        args->v0.page_nr = 0;
 348        while (page && (page++)->shift)
 349                args->v0.page_nr++;
 350        args->v0.addr = uvmm->vmm->start;
 351        args->v0.size = uvmm->vmm->limit;
 352        return 0;
 353}
 354