cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/core/ioctl.c

/*
 * Copyright 2014 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs <bskeggs@redhat.com>
 */
#include <core/ioctl.h>
#include <core/client.h>
#include <core/engine.h>

#include <nvif/unpack.h>
#include <nvif/ioctl.h>


static int nvkm_ioctl_nop(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_nop_v0 v0; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "nop size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) { nvif_ioctl(object, "nop vers %lld\n", args->v0.version); args->v0.version = NVIF_VERSION_LATEST; } return ret; }

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static int nvkm_ioctl_sclass(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_sclass_v0 v0; } *args = data; struct nvkm_oclass oclass; int ret = -ENOSYS, i = 0; nvif_ioctl(object, "sclass size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { nvif_ioctl(object, "sclass vers %d count %d\n", args->v0.version, args->v0.count); if (size != args->v0.count * sizeof(args->v0.oclass[0])) return -EINVAL; while (object->func->sclass && object->func->sclass(object, i, &oclass) >= 0) { if (i < args->v0.count) { args->v0.oclass[i].oclass = oclass.base.oclass; args->v0.oclass[i].minver = oclass.base.minver; args->v0.oclass[i].maxver = oclass.base.maxver; } i++; } args->v0.count = i; } return ret; }

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static int nvkm_ioctl_new(struct nvkm_client *client, struct nvkm_object *parent, void *data, u32 size) { union { struct nvif_ioctl_new_v0 v0; } *args = data; struct nvkm_object *object = NULL; struct nvkm_oclass oclass; int ret = -ENOSYS, i = 0; nvif_ioctl(parent, "new size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { nvif_ioctl(parent, "new vers %d handle %08x class %08x " "route %02x token %llx object %016llx\n", args->v0.version, args->v0.handle, args->v0.oclass, args->v0.route, args->v0.token, args->v0.object); } else return ret; if (!parent->func->sclass) { nvif_ioctl(parent, "cannot have children\n"); return -EINVAL; } do { memset(&oclass, 0x00, sizeof(oclass)); oclass.handle = args->v0.handle; oclass.route = args->v0.route; oclass.token = args->v0.token; oclass.object = args->v0.object; oclass.client = client; oclass.parent = parent; ret = parent->func->sclass(parent, i++, &oclass); if (ret) return ret; } while (oclass.base.oclass != args->v0.oclass); if (oclass.engine) { oclass.engine = nvkm_engine_ref(oclass.engine); if (IS_ERR(oclass.engine)) return PTR_ERR(oclass.engine); } ret = oclass.ctor(&oclass, data, size, &object); nvkm_engine_unref(&oclass.engine); if (ret == 0) { ret = nvkm_object_init(object); if (ret == 0) { list_add(&object->head, &parent->tree); if (nvkm_object_insert(object)) { client->data = object; return 0; } ret = -EEXIST; } nvkm_object_fini(object, false); } nvkm_object_del(&object); return ret; }

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static int nvkm_ioctl_del(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_del none; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "delete size %d\n", size); if (!(ret = nvif_unvers(ret, &data, &size, args->none))) { nvif_ioctl(object, "delete\n"); nvkm_object_fini(object, false); nvkm_object_del(&object); } return ret ? ret : 1; }

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static int nvkm_ioctl_mthd(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_mthd_v0 v0; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "mthd size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { nvif_ioctl(object, "mthd vers %d mthd %02x\n", args->v0.version, args->v0.method); ret = nvkm_object_mthd(object, args->v0.method, data, size); } return ret; }

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static int nvkm_ioctl_rd(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_rd_v0 v0; } *args = data; union { u8 b08; u16 b16; u32 b32; } v; int ret = -ENOSYS; nvif_ioctl(object, "rd size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) { nvif_ioctl(object, "rd vers %d size %d addr %016llx\n", args->v0.version, args->v0.size, args->v0.addr); switch (args->v0.size) { case 1: ret = nvkm_object_rd08(object, args->v0.addr, &v.b08); args->v0.data = v.b08; break; case 2: ret = nvkm_object_rd16(object, args->v0.addr, &v.b16); args->v0.data = v.b16; break; case 4: ret = nvkm_object_rd32(object, args->v0.addr, &v.b32); args->v0.data = v.b32; break; default: ret = -EINVAL; break; } } return ret; }

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static int nvkm_ioctl_wr(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_wr_v0 v0; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "wr size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) { nvif_ioctl(object, "wr vers %d size %d addr %016llx data %08x\n", args->v0.version, args->v0.size, args->v0.addr, args->v0.data); } else return ret; switch (args->v0.size) { case 1: return nvkm_object_wr08(object, args->v0.addr, args->v0.data); case 2: return nvkm_object_wr16(object, args->v0.addr, args->v0.data); case 4: return nvkm_object_wr32(object, args->v0.addr, args->v0.data); default: break; } return -EINVAL; }

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static int nvkm_ioctl_map(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_map_v0 v0; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "map size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) { nvif_ioctl(object, "map vers %d\n", args->v0.version); ret = nvkm_object_map(object, &args->v0.handle, &args->v0.length); } return ret; }

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static int nvkm_ioctl_unmap(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_unmap none; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "unmap size %d\n", size); if (!(ret = nvif_unvers(ret, &data, &size, args->none))) { nvif_ioctl(object, "unmap\n"); } return ret; }

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static int nvkm_ioctl_ntfy_new(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_ntfy_new_v0 v0; } *args = data; struct nvkm_event *event; int ret = -ENOSYS; nvif_ioctl(object, "ntfy new size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { nvif_ioctl(object, "ntfy new vers %d event %02x\n", args->v0.version, args->v0.event); ret = nvkm_object_ntfy(object, args->v0.event, &event); if (ret == 0) { ret = nvkm_client_notify_new(object, event, data, size); if (ret >= 0) { args->v0.index = ret; ret = 0; } } } return ret; }

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static int nvkm_ioctl_ntfy_del(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_ntfy_del_v0 v0; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "ntfy del size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) { nvif_ioctl(object, "ntfy del vers %d index %d\n", args->v0.version, args->v0.index); ret = nvkm_client_notify_del(client, args->v0.index); } return ret; }

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static int nvkm_ioctl_ntfy_get(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_ntfy_get_v0 v0; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "ntfy get size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) { nvif_ioctl(object, "ntfy get vers %d index %d\n", args->v0.version, args->v0.index); ret = nvkm_client_notify_get(client, args->v0.index); } return ret; }

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static int nvkm_ioctl_ntfy_put(struct nvkm_client *client, struct nvkm_object *object, void *data, u32 size) { union { struct nvif_ioctl_ntfy_put_v0 v0; } *args = data; int ret = -ENOSYS; nvif_ioctl(object, "ntfy put size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) { nvif_ioctl(object, "ntfy put vers %d index %d\n", args->v0.version, args->v0.index); ret = nvkm_client_notify_put(client, args->v0.index); } return ret; }

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static struct { int version; int (*func)(struct nvkm_client *, struct nvkm_object *, void *, u32); } nvkm_ioctl_v0[] = { { 0x00, nvkm_ioctl_nop }, { 0x00, nvkm_ioctl_sclass }, { 0x00, nvkm_ioctl_new }, { 0x00, nvkm_ioctl_del }, { 0x00, nvkm_ioctl_mthd }, { 0x00, nvkm_ioctl_rd }, { 0x00, nvkm_ioctl_wr }, { 0x00, nvkm_ioctl_map }, { 0x00, nvkm_ioctl_unmap }, { 0x00, nvkm_ioctl_ntfy_new }, { 0x00, nvkm_ioctl_ntfy_del }, { 0x00, nvkm_ioctl_ntfy_get }, { 0x00, nvkm_ioctl_ntfy_put }, };
static int nvkm_ioctl_path(struct nvkm_client *client, u64 handle, u32 type, void *data, u32 size, u8 owner, u8 *route, u64 *token) { struct nvkm_object *object; int ret; object = nvkm_object_search(client, handle, NULL); if (IS_ERR(object)) { nvif_ioctl(&client->object, "object not found\n"); return PTR_ERR(object); } if (owner != NVIF_IOCTL_V0_OWNER_ANY && owner != object->route) { nvif_ioctl(&client->object, "route != owner\n"); return -EACCES; } *route = object->route; *token = object->token; if (ret = -EINVAL, type < ARRAY_SIZE(nvkm_ioctl_v0)) { if (nvkm_ioctl_v0[type].version == 0) ret = nvkm_ioctl_v0[type].func(client, object, data, size); } return ret; }

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int nvkm_ioctl(struct nvkm_client *client, bool supervisor, void *data, u32 size, void **hack) { struct nvkm_object *object = &client->object; union { struct nvif_ioctl_v0 v0; } *args = data; int ret = -ENOSYS; client->super = supervisor; nvif_ioctl(object, "size %d\n", size); if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) { nvif_ioctl(object, "vers %d type %02x object %016llx owner %02x\n", args->v0.version, args->v0.type, args->v0.object, args->v0.owner); ret = nvkm_ioctl_path(client, args->v0.object, args->v0.type, data, size, args->v0.owner, &args->v0.route, &args->v0.token); } if (ret != 1) { nvif_ioctl(object, "return %d\n", ret); if (hack) { *hack = client->data; client->data = NULL; } } return ret; }

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