drivers/infiniband/hw/mlx5/devx.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2018, Mellanox Technologies inc.  All rights reserved.
   4  */
   5
   6 #include <rdma/ib_user_verbs.h>
   7 #include <rdma/ib_verbs.h>
   8 #include <rdma/uverbs_types.h>
   9 #include <rdma/uverbs_ioctl.h>
  10 #include <rdma/mlx5_user_ioctl_cmds.h>
  11 #include <rdma/mlx5_user_ioctl_verbs.h>
  12 #include <rdma/ib_umem.h>
  13 #include <rdma/uverbs_std_types.h>
  14 #include <linux/mlx5/driver.h>
  15 #include <linux/mlx5/fs.h>
  16 #include "mlx5_ib.h"
  17 #include <linux/xarray.h>
  18
  19 #define UVERBS_MODULE_NAME mlx5_ib
  20 #include <rdma/uverbs_named_ioctl.h>
  21
  22 static void dispatch_event_fd(struct list_head *fd_list, const void *data);
  23
  24 enum devx_obj_flags {
  25         DEVX_OBJ_FLAGS_INDIRECT_MKEY = 1 << 0,
  26         DEVX_OBJ_FLAGS_DCT = 1 << 1,
  27         DEVX_OBJ_FLAGS_CQ = 1 << 2,
  28 };
  29
  30 struct devx_async_data {
  31         struct mlx5_ib_dev *mdev;
  32         struct list_head list;
  33         struct ib_uobject *fd_uobj;
  34         struct mlx5_async_work cb_work;
  35         u16 cmd_out_len;
  36         /* must be last field in this structure */
  37         struct mlx5_ib_uapi_devx_async_cmd_hdr hdr;
  38 };
  39
  40 struct devx_async_event_data {
  41         struct list_head list; /* headed in ev_file->event_list */
  42         struct mlx5_ib_uapi_devx_async_event_hdr hdr;
  43 };
  44
  45 /* first level XA value data structure */
  46 struct devx_event {
  47         struct xarray object_ids; /* second XA level, Key = object id */
  48         struct list_head unaffiliated_list;
  49 };
  50
  51 /* second level XA value data structure */
  52 struct devx_obj_event {
  53         struct rcu_head rcu;
  54         struct list_head obj_sub_list;
  55 };
  56
  57 struct devx_event_subscription {
  58         struct list_head file_list; /* headed in ev_file->
  59                                      * subscribed_events_list
  60                                      */
  61         struct list_head xa_list; /* headed in devx_event->unaffiliated_list or
  62                                    * devx_obj_event->obj_sub_list
  63                                    */
  64         struct list_head obj_list; /* headed in devx_object */
  65         struct list_head event_list; /* headed in ev_file->event_list or in
  66                                       * temp list via subscription
  67                                       */
  68
  69         u8 is_cleaned:1;
  70         u32 xa_key_level1;
  71         u32 xa_key_level2;
  72         struct rcu_head rcu;
  73         u64 cookie;
  74         struct devx_async_event_file *ev_file;
  75         struct file *filp; /* Upon hot unplug we need a direct access to */
  76         struct eventfd_ctx *eventfd;
  77 };
  78
  79 struct devx_async_event_file {
  80         struct ib_uobject uobj;
  81         /* Head of events that are subscribed to this FD */
  82         struct list_head subscribed_events_list;
  83         spinlock_t lock;
  84         wait_queue_head_t poll_wait;
  85         struct list_head event_list;
  86         struct mlx5_ib_dev *dev;
  87         u8 omit_data:1;
  88         u8 is_overflow_err:1;
  89         u8 is_destroyed:1;
  90 };
  91
  92 #define MLX5_MAX_DESTROY_INBOX_SIZE_DW MLX5_ST_SZ_DW(delete_fte_in)
  93 struct devx_obj {
  94         struct mlx5_ib_dev      *ib_dev;
  95         u64                     obj_id;
  96         u32                     dinlen; /* destroy inbox length */
  97         u32                     dinbox[MLX5_MAX_DESTROY_INBOX_SIZE_DW];
  98         u32                     flags;
  99         union {
 100                 struct mlx5_ib_devx_mr  devx_mr;
 101                 struct mlx5_core_dct    core_dct;
 102                 struct mlx5_core_cq     core_cq;
 103         };
 104         struct list_head event_sub; /* holds devx_event_subscription entries */
 105 };
 106
 107 struct devx_umem {
 108         struct mlx5_core_dev            *mdev;
 109         struct ib_umem                  *umem;
 110         u32                             page_offset;
 111         int                             page_shift;
 112         int                             ncont;
 113         u32                             dinlen;
 114         u32                             dinbox[MLX5_ST_SZ_DW(general_obj_in_cmd_hdr)];
 115 };
 116
 117 struct devx_umem_reg_cmd {
 118         void                            *in;
 119         u32                             inlen;
 120         u32                             out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
 121 };
 122
 123 static struct mlx5_ib_ucontext *
 124 devx_ufile2uctx(const struct uverbs_attr_bundle *attrs)
 125 {
 126         return to_mucontext(ib_uverbs_get_ucontext(attrs));
 127 }
 128
 129 int mlx5_ib_devx_create(struct mlx5_ib_dev *dev, bool is_user)
 130 {
 131         u32 in[MLX5_ST_SZ_DW(create_uctx_in)] = {0};
 132         u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {0};
 133         void *uctx;
 134         int err;
 135         u16 uid;
 136         u32 cap = 0;
 137
 138         /* 0 means not supported */
 139         if (!MLX5_CAP_GEN(dev->mdev, log_max_uctx))
 140                 return -EINVAL;
 141
 142         uctx = MLX5_ADDR_OF(create_uctx_in, in, uctx);
 143         if (is_user && capable(CAP_NET_RAW) &&
 144             (MLX5_CAP_GEN(dev->mdev, uctx_cap) & MLX5_UCTX_CAP_RAW_TX))
 145                 cap |= MLX5_UCTX_CAP_RAW_TX;
 146         if (is_user && capable(CAP_SYS_RAWIO) &&
 147             (MLX5_CAP_GEN(dev->mdev, uctx_cap) &
 148              MLX5_UCTX_CAP_INTERNAL_DEV_RES))
 149                 cap |= MLX5_UCTX_CAP_INTERNAL_DEV_RES;
 150
 151         MLX5_SET(create_uctx_in, in, opcode, MLX5_CMD_OP_CREATE_UCTX);
 152         MLX5_SET(uctx, uctx, cap, cap);
 153
 154         err = mlx5_cmd_exec(dev->mdev, in, sizeof(in), out, sizeof(out));
 155         if (err)
 156                 return err;
 157
 158         uid = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id);
 159         return uid;
 160 }
 161
 162 void mlx5_ib_devx_destroy(struct mlx5_ib_dev *dev, u16 uid)
 163 {
 164         u32 in[MLX5_ST_SZ_DW(destroy_uctx_in)] = {0};
 165         u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {0};
 166
 167         MLX5_SET(destroy_uctx_in, in, opcode, MLX5_CMD_OP_DESTROY_UCTX);
 168         MLX5_SET(destroy_uctx_in, in, uid, uid);
 169
 170         mlx5_cmd_exec(dev->mdev, in, sizeof(in), out, sizeof(out));
 171 }
 172
 173 bool mlx5_ib_devx_is_flow_dest(void *obj, int *dest_id, int *dest_type)
 174 {
 175         struct devx_obj *devx_obj = obj;
 176         u16 opcode = MLX5_GET(general_obj_in_cmd_hdr, devx_obj->dinbox, opcode);
 177
 178         switch (opcode) {
 179         case MLX5_CMD_OP_DESTROY_TIR:
 180                 *dest_type = MLX5_FLOW_DESTINATION_TYPE_TIR;
 181                 *dest_id = MLX5_GET(general_obj_in_cmd_hdr, devx_obj->dinbox,
 182                                     obj_id);
 183                 return true;
 184
 185         case MLX5_CMD_OP_DESTROY_FLOW_TABLE:
 186                 *dest_type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
 187                 *dest_id = MLX5_GET(destroy_flow_table_in, devx_obj->dinbox,
 188                                     table_id);
 189                 return true;
 190         default:
 191                 return false;
 192         }
 193 }
 194
 195 bool mlx5_ib_devx_is_flow_counter(void *obj, u32 *counter_id)
 196 {
 197         struct devx_obj *devx_obj = obj;
 198         u16 opcode = MLX5_GET(general_obj_in_cmd_hdr, devx_obj->dinbox, opcode);
 199
 200         if (opcode == MLX5_CMD_OP_DEALLOC_FLOW_COUNTER) {
 201                 *counter_id = MLX5_GET(dealloc_flow_counter_in,
 202                                        devx_obj->dinbox,
 203                                        flow_counter_id);
 204                 return true;
 205         }
 206
 207         return false;
 208 }
 209
 210 static bool is_legacy_unaffiliated_event_num(u16 event_num)
 211 {
 212         switch (event_num) {
 213         case MLX5_EVENT_TYPE_PORT_CHANGE:
 214                 return true;
 215         default:
 216                 return false;
 217         }
 218 }
 219
 220 static bool is_legacy_obj_event_num(u16 event_num)
 221 {
 222         switch (event_num) {
 223         case MLX5_EVENT_TYPE_PATH_MIG:
 224         case MLX5_EVENT_TYPE_COMM_EST:
 225         case MLX5_EVENT_TYPE_SQ_DRAINED:
 226         case MLX5_EVENT_TYPE_SRQ_LAST_WQE:
 227         case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
 228         case MLX5_EVENT_TYPE_CQ_ERROR:
 229         case MLX5_EVENT_TYPE_WQ_CATAS_ERROR:
 230         case MLX5_EVENT_TYPE_PATH_MIG_FAILED:
 231         case MLX5_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
 232         case MLX5_EVENT_TYPE_WQ_ACCESS_ERROR:
 233         case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
 234         case MLX5_EVENT_TYPE_DCT_DRAINED:
 235         case MLX5_EVENT_TYPE_COMP:
 236                 return true;
 237         default:
 238                 return false;
 239         }
 240 }
 241
 242 static u16 get_legacy_obj_type(u16 opcode)
 243 {
 244         switch (opcode) {
 245         case MLX5_CMD_OP_CREATE_RQ:
 246                 return MLX5_EVENT_QUEUE_TYPE_RQ;
 247         case MLX5_CMD_OP_CREATE_QP:
 248                 return MLX5_EVENT_QUEUE_TYPE_QP;
 249         case MLX5_CMD_OP_CREATE_SQ:
 250                 return MLX5_EVENT_QUEUE_TYPE_SQ;
 251         case MLX5_CMD_OP_CREATE_DCT:
 252                 return MLX5_EVENT_QUEUE_TYPE_DCT;
 253         default:
 254                 return 0;
 255         }
 256 }
 257
 258 static u16 get_dec_obj_type(struct devx_obj *obj, u16 event_num)
 259 {
 260         u16 opcode;
 261
 262         opcode = (obj->obj_id >> 32) & 0xffff;
 263
 264         if (is_legacy_obj_event_num(event_num))
 265                 return get_legacy_obj_type(opcode);
 266
 267         switch (opcode) {
 268         case MLX5_CMD_OP_CREATE_GENERAL_OBJECT:
 269                 return (obj->obj_id >> 48);
 270         case MLX5_CMD_OP_CREATE_RQ:
 271                 return MLX5_OBJ_TYPE_RQ;
 272         case MLX5_CMD_OP_CREATE_QP:
 273                 return MLX5_OBJ_TYPE_QP;
 274         case MLX5_CMD_OP_CREATE_SQ:
 275                 return MLX5_OBJ_TYPE_SQ;
 276         case MLX5_CMD_OP_CREATE_DCT:
 277                 return MLX5_OBJ_TYPE_DCT;
 278         case MLX5_CMD_OP_CREATE_TIR:
 279                 return MLX5_OBJ_TYPE_TIR;
 280         case MLX5_CMD_OP_CREATE_TIS:
 281                 return MLX5_OBJ_TYPE_TIS;
 282         case MLX5_CMD_OP_CREATE_PSV:
 283                 return MLX5_OBJ_TYPE_PSV;
 284         case MLX5_OBJ_TYPE_MKEY:
 285                 return MLX5_OBJ_TYPE_MKEY;
 286         case MLX5_CMD_OP_CREATE_RMP:
 287                 return MLX5_OBJ_TYPE_RMP;
 288         case MLX5_CMD_OP_CREATE_XRC_SRQ:
 289                 return MLX5_OBJ_TYPE_XRC_SRQ;
 290         case MLX5_CMD_OP_CREATE_XRQ:
 291                 return MLX5_OBJ_TYPE_XRQ;
 292         case MLX5_CMD_OP_CREATE_RQT:
 293                 return MLX5_OBJ_TYPE_RQT;
 294         case MLX5_CMD_OP_ALLOC_FLOW_COUNTER:
 295                 return MLX5_OBJ_TYPE_FLOW_COUNTER;
 296         case MLX5_CMD_OP_CREATE_CQ:
 297                 return MLX5_OBJ_TYPE_CQ;
 298         default:
 299                 return 0;
 300         }
 301 }
 302
 303 static u16 get_event_obj_type(unsigned long event_type, struct mlx5_eqe *eqe)
 304 {
 305         switch (event_type) {
 306         case MLX5_EVENT_TYPE_WQ_CATAS_ERROR:
 307         case MLX5_EVENT_TYPE_WQ_ACCESS_ERROR:
 308         case MLX5_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
 309         case MLX5_EVENT_TYPE_SRQ_LAST_WQE:
 310         case MLX5_EVENT_TYPE_PATH_MIG:
 311         case MLX5_EVENT_TYPE_PATH_MIG_FAILED:
 312         case MLX5_EVENT_TYPE_COMM_EST:
 313         case MLX5_EVENT_TYPE_SQ_DRAINED:
 314         case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
 315         case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
 316                 return eqe->data.qp_srq.type;
 317         case MLX5_EVENT_TYPE_CQ_ERROR:
 318                 return 0;
 319         case MLX5_EVENT_TYPE_DCT_DRAINED:
 320                 return MLX5_EVENT_QUEUE_TYPE_DCT;
 321         default:
 322                 return MLX5_GET(affiliated_event_header, &eqe->data, obj_type);
 323         }
 324 }
 325
 326 static u32 get_dec_obj_id(u64 obj_id)
 327 {
 328         return (obj_id & 0xffffffff);
 329 }
 330
 331 /*
 332  * As the obj_id in the firmware is not globally unique the object type
 333  * must be considered upon checking for a valid object id.
 334  * For that the opcode of the creator command is encoded as part of the obj_id.
 335  */
 336 static u64 get_enc_obj_id(u32 opcode, u32 obj_id)
 337 {
 338         return ((u64)opcode << 32) | obj_id;
 339 }
 340
 341 static u64 devx_get_obj_id(const void *in)
 342 {
 343         u16 opcode = MLX5_GET(general_obj_in_cmd_hdr, in, opcode);
 344         u64 obj_id;
 345
 346         switch (opcode) {
 347         case MLX5_CMD_OP_MODIFY_GENERAL_OBJECT:
 348         case MLX5_CMD_OP_QUERY_GENERAL_OBJECT:
 349                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_GENERAL_OBJECT |
 350                                         MLX5_GET(general_obj_in_cmd_hdr, in,
 351                                                  obj_type) << 16,
 352                                         MLX5_GET(general_obj_in_cmd_hdr, in,
 353                                                  obj_id));
 354                 break;
 355         case MLX5_CMD_OP_QUERY_MKEY:
 356                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_MKEY,
 357                                         MLX5_GET(query_mkey_in, in,
 358                                                  mkey_index));
 359                 break;
 360         case MLX5_CMD_OP_QUERY_CQ:
 361                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_CQ,
 362                                         MLX5_GET(query_cq_in, in, cqn));
 363                 break;
 364         case MLX5_CMD_OP_MODIFY_CQ:
 365                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_CQ,
 366                                         MLX5_GET(modify_cq_in, in, cqn));
 367                 break;
 368         case MLX5_CMD_OP_QUERY_SQ:
 369                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_SQ,
 370                                         MLX5_GET(query_sq_in, in, sqn));
 371                 break;
 372         case MLX5_CMD_OP_MODIFY_SQ:
 373                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_SQ,
 374                                         MLX5_GET(modify_sq_in, in, sqn));
 375                 break;
 376         case MLX5_CMD_OP_QUERY_RQ:
 377                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_RQ,
 378                                         MLX5_GET(query_rq_in, in, rqn));
 379                 break;
 380         case MLX5_CMD_OP_MODIFY_RQ:
 381                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_RQ,
 382                                         MLX5_GET(modify_rq_in, in, rqn));
 383                 break;
 384         case MLX5_CMD_OP_QUERY_RMP:
 385                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_RMP,
 386                                         MLX5_GET(query_rmp_in, in, rmpn));
 387                 break;
 388         case MLX5_CMD_OP_MODIFY_RMP:
 389                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_RMP,
 390                                         MLX5_GET(modify_rmp_in, in, rmpn));
 391                 break;
 392         case MLX5_CMD_OP_QUERY_RQT:
 393                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_RQT,
 394                                         MLX5_GET(query_rqt_in, in, rqtn));
 395                 break;
 396         case MLX5_CMD_OP_MODIFY_RQT:
 397                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_RQT,
 398                                         MLX5_GET(modify_rqt_in, in, rqtn));
 399                 break;
 400         case MLX5_CMD_OP_QUERY_TIR:
 401                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_TIR,
 402                                         MLX5_GET(query_tir_in, in, tirn));
 403                 break;
 404         case MLX5_CMD_OP_MODIFY_TIR:
 405                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_TIR,
 406                                         MLX5_GET(modify_tir_in, in, tirn));
 407                 break;
 408         case MLX5_CMD_OP_QUERY_TIS:
 409                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_TIS,
 410                                         MLX5_GET(query_tis_in, in, tisn));
 411                 break;
 412         case MLX5_CMD_OP_MODIFY_TIS:
 413                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_TIS,
 414                                         MLX5_GET(modify_tis_in, in, tisn));
 415                 break;
 416         case MLX5_CMD_OP_QUERY_FLOW_TABLE:
 417                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_FLOW_TABLE,
 418                                         MLX5_GET(query_flow_table_in, in,
 419                                                  table_id));
 420                 break;
 421         case MLX5_CMD_OP_MODIFY_FLOW_TABLE:
 422                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_FLOW_TABLE,
 423                                         MLX5_GET(modify_flow_table_in, in,
 424                                                  table_id));
 425                 break;
 426         case MLX5_CMD_OP_QUERY_FLOW_GROUP:
 427                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_FLOW_GROUP,
 428                                         MLX5_GET(query_flow_group_in, in,
 429                                                  group_id));
 430                 break;
 431         case MLX5_CMD_OP_QUERY_FLOW_TABLE_ENTRY:
 432                 obj_id = get_enc_obj_id(MLX5_CMD_OP_SET_FLOW_TABLE_ENTRY,
 433                                         MLX5_GET(query_fte_in, in,
 434                                                  flow_index));
 435                 break;
 436         case MLX5_CMD_OP_SET_FLOW_TABLE_ENTRY:
 437                 obj_id = get_enc_obj_id(MLX5_CMD_OP_SET_FLOW_TABLE_ENTRY,
 438                                         MLX5_GET(set_fte_in, in, flow_index));
 439                 break;
 440         case MLX5_CMD_OP_QUERY_Q_COUNTER:
 441                 obj_id = get_enc_obj_id(MLX5_CMD_OP_ALLOC_Q_COUNTER,
 442                                         MLX5_GET(query_q_counter_in, in,
 443                                                  counter_set_id));
 444                 break;
 445         case MLX5_CMD_OP_QUERY_FLOW_COUNTER:
 446                 obj_id = get_enc_obj_id(MLX5_CMD_OP_ALLOC_FLOW_COUNTER,
 447                                         MLX5_GET(query_flow_counter_in, in,
 448                                                  flow_counter_id));
 449                 break;
 450         case MLX5_CMD_OP_QUERY_MODIFY_HEADER_CONTEXT:
 451                 obj_id = get_enc_obj_id(MLX5_CMD_OP_ALLOC_MODIFY_HEADER_CONTEXT,
 452                                         MLX5_GET(general_obj_in_cmd_hdr, in,
 453                                                  obj_id));
 454                 break;
 455         case MLX5_CMD_OP_QUERY_SCHEDULING_ELEMENT:
 456                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_SCHEDULING_ELEMENT,
 457                                         MLX5_GET(query_scheduling_element_in,
 458                                                  in, scheduling_element_id));
 459                 break;
 460         case MLX5_CMD_OP_MODIFY_SCHEDULING_ELEMENT:
 461                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_SCHEDULING_ELEMENT,
 462                                         MLX5_GET(modify_scheduling_element_in,
 463                                                  in, scheduling_element_id));
 464                 break;
 465         case MLX5_CMD_OP_ADD_VXLAN_UDP_DPORT:
 466                 obj_id = get_enc_obj_id(MLX5_CMD_OP_ADD_VXLAN_UDP_DPORT,
 467                                         MLX5_GET(add_vxlan_udp_dport_in, in,
 468                                                  vxlan_udp_port));
 469                 break;
 470         case MLX5_CMD_OP_QUERY_L2_TABLE_ENTRY:
 471                 obj_id = get_enc_obj_id(MLX5_CMD_OP_SET_L2_TABLE_ENTRY,
 472                                         MLX5_GET(query_l2_table_entry_in, in,
 473                                                  table_index));
 474                 break;
 475         case MLX5_CMD_OP_SET_L2_TABLE_ENTRY:
 476                 obj_id = get_enc_obj_id(MLX5_CMD_OP_SET_L2_TABLE_ENTRY,
 477                                         MLX5_GET(set_l2_table_entry_in, in,
 478                                                  table_index));
 479                 break;
 480         case MLX5_CMD_OP_QUERY_QP:
 481                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 482                                         MLX5_GET(query_qp_in, in, qpn));
 483                 break;
 484         case MLX5_CMD_OP_RST2INIT_QP:
 485                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 486                                         MLX5_GET(rst2init_qp_in, in, qpn));
 487                 break;
 488         case MLX5_CMD_OP_INIT2RTR_QP:
 489                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 490                                         MLX5_GET(init2rtr_qp_in, in, qpn));
 491                 break;
 492         case MLX5_CMD_OP_RTR2RTS_QP:
 493                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 494                                         MLX5_GET(rtr2rts_qp_in, in, qpn));
 495                 break;
 496         case MLX5_CMD_OP_RTS2RTS_QP:
 497                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 498                                         MLX5_GET(rts2rts_qp_in, in, qpn));
 499                 break;
 500         case MLX5_CMD_OP_SQERR2RTS_QP:
 501                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 502                                         MLX5_GET(sqerr2rts_qp_in, in, qpn));
 503                 break;
 504         case MLX5_CMD_OP_2ERR_QP:
 505                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 506                                         MLX5_GET(qp_2err_in, in, qpn));
 507                 break;
 508         case MLX5_CMD_OP_2RST_QP:
 509                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 510                                         MLX5_GET(qp_2rst_in, in, qpn));
 511                 break;
 512         case MLX5_CMD_OP_QUERY_DCT:
 513                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_DCT,
 514                                         MLX5_GET(query_dct_in, in, dctn));
 515                 break;
 516         case MLX5_CMD_OP_QUERY_XRQ:
 517         case MLX5_CMD_OP_QUERY_XRQ_DC_PARAMS_ENTRY:
 518         case MLX5_CMD_OP_QUERY_XRQ_ERROR_PARAMS:
 519                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_XRQ,
 520                                         MLX5_GET(query_xrq_in, in, xrqn));
 521                 break;
 522         case MLX5_CMD_OP_QUERY_XRC_SRQ:
 523                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_XRC_SRQ,
 524                                         MLX5_GET(query_xrc_srq_in, in,
 525                                                  xrc_srqn));
 526                 break;
 527         case MLX5_CMD_OP_ARM_XRC_SRQ:
 528                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_XRC_SRQ,
 529                                         MLX5_GET(arm_xrc_srq_in, in, xrc_srqn));
 530                 break;
 531         case MLX5_CMD_OP_QUERY_SRQ:
 532                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_SRQ,
 533                                         MLX5_GET(query_srq_in, in, srqn));
 534                 break;
 535         case MLX5_CMD_OP_ARM_RQ:
 536                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_RQ,
 537                                         MLX5_GET(arm_rq_in, in, srq_number));
 538                 break;
 539         case MLX5_CMD_OP_ARM_DCT_FOR_KEY_VIOLATION:
 540                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_DCT,
 541                                         MLX5_GET(drain_dct_in, in, dctn));
 542                 break;
 543         case MLX5_CMD_OP_ARM_XRQ:
 544         case MLX5_CMD_OP_SET_XRQ_DC_PARAMS_ENTRY:
 545                 obj_id = get_enc_obj_id(MLX5_CMD_OP_CREATE_XRQ,
 546                                         MLX5_GET(arm_xrq_in, in, xrqn));
 547                 break;
 548         case MLX5_CMD_OP_QUERY_PACKET_REFORMAT_CONTEXT:
 549                 obj_id = get_enc_obj_id
 550                                 (MLX5_CMD_OP_ALLOC_PACKET_REFORMAT_CONTEXT,
 551                                  MLX5_GET(query_packet_reformat_context_in,
 552                                           in, packet_reformat_id));
 553                 break;
 554         default:
 555                 obj_id = 0;
 556         }
 557
 558         return obj_id;
 559 }
 560
 561 static bool devx_is_valid_obj_id(struct uverbs_attr_bundle *attrs,
 562                                  struct ib_uobject *uobj, const void *in)
 563 {
 564         struct mlx5_ib_dev *dev = mlx5_udata_to_mdev(&attrs->driver_udata);
 565         u64 obj_id = devx_get_obj_id(in);
 566
 567         if (!obj_id)
 568                 return false;
 569
 570         switch (uobj_get_object_id(uobj)) {
 571         case UVERBS_OBJECT_CQ:
 572                 return get_enc_obj_id(MLX5_CMD_OP_CREATE_CQ,
 573                                       to_mcq(uobj->object)->mcq.cqn) ==
 574                                       obj_id;
 575
 576         case UVERBS_OBJECT_SRQ:
 577         {
 578                 struct mlx5_core_srq *srq = &(to_msrq(uobj->object)->msrq);
 579                 u16 opcode;
 580
 581                 switch (srq->common.res) {
 582                 case MLX5_RES_XSRQ:
 583                         opcode = MLX5_CMD_OP_CREATE_XRC_SRQ;
 584                         break;
 585                 case MLX5_RES_XRQ:
 586                         opcode = MLX5_CMD_OP_CREATE_XRQ;
 587                         break;
 588                 default:
 589                         if (!dev->mdev->issi)
 590                                 opcode = MLX5_CMD_OP_CREATE_SRQ;
 591                         else
 592                                 opcode = MLX5_CMD_OP_CREATE_RMP;
 593                 }
 594
 595                 return get_enc_obj_id(opcode,
 596                                       to_msrq(uobj->object)->msrq.srqn) ==
 597                                       obj_id;
 598         }
 599
 600         case UVERBS_OBJECT_QP:
 601         {
 602                 struct mlx5_ib_qp *qp = to_mqp(uobj->object);
 603                 enum ib_qp_type qp_type = qp->ibqp.qp_type;
 604
 605                 if (qp_type == IB_QPT_RAW_PACKET ||
 606                     (qp->flags & MLX5_IB_QP_UNDERLAY)) {
 607                         struct mlx5_ib_raw_packet_qp *raw_packet_qp =
 608                                                          &qp->raw_packet_qp;
 609                         struct mlx5_ib_rq *rq = &raw_packet_qp->rq;
 610                         struct mlx5_ib_sq *sq = &raw_packet_qp->sq;
 611
 612                         return (get_enc_obj_id(MLX5_CMD_OP_CREATE_RQ,
 613                                                rq->base.mqp.qpn) == obj_id ||
 614                                 get_enc_obj_id(MLX5_CMD_OP_CREATE_SQ,
 615                                                sq->base.mqp.qpn) == obj_id ||
 616                                 get_enc_obj_id(MLX5_CMD_OP_CREATE_TIR,
 617                                                rq->tirn) == obj_id ||
 618                                 get_enc_obj_id(MLX5_CMD_OP_CREATE_TIS,
 619                                                sq->tisn) == obj_id);
 620                 }
 621
 622                 if (qp_type == MLX5_IB_QPT_DCT)
 623                         return get_enc_obj_id(MLX5_CMD_OP_CREATE_DCT,
 624                                               qp->dct.mdct.mqp.qpn) == obj_id;
 625
 626                 return get_enc_obj_id(MLX5_CMD_OP_CREATE_QP,
 627                                       qp->ibqp.qp_num) == obj_id;
 628         }
 629
 630         case UVERBS_OBJECT_WQ:
 631                 return get_enc_obj_id(MLX5_CMD_OP_CREATE_RQ,
 632                                       to_mrwq(uobj->object)->core_qp.qpn) ==
 633                                       obj_id;
 634
 635         case UVERBS_OBJECT_RWQ_IND_TBL:
 636                 return get_enc_obj_id(MLX5_CMD_OP_CREATE_RQT,
 637                                       to_mrwq_ind_table(uobj->object)->rqtn) ==
 638                                       obj_id;
 639
 640         case MLX5_IB_OBJECT_DEVX_OBJ:
 641                 return ((struct devx_obj *)uobj->object)->obj_id == obj_id;
 642
 643         default:
 644                 return false;
 645         }
 646 }
 647
 648 static void devx_set_umem_valid(const void *in)
 649 {
 650         u16 opcode = MLX5_GET(general_obj_in_cmd_hdr, in, opcode);
 651
 652         switch (opcode) {
 653         case MLX5_CMD_OP_CREATE_MKEY:
 654                 MLX5_SET(create_mkey_in, in, mkey_umem_valid, 1);
 655                 break;
 656         case MLX5_CMD_OP_CREATE_CQ:
 657         {
 658                 void *cqc;
 659
 660                 MLX5_SET(create_cq_in, in, cq_umem_valid, 1);
 661                 cqc = MLX5_ADDR_OF(create_cq_in, in, cq_context);
 662                 MLX5_SET(cqc, cqc, dbr_umem_valid, 1);
 663                 break;
 664         }
 665         case MLX5_CMD_OP_CREATE_QP:
 666         {
 667                 void *qpc;
 668
 669                 qpc = MLX5_ADDR_OF(create_qp_in, in, qpc);
 670                 MLX5_SET(qpc, qpc, dbr_umem_valid, 1);
 671                 MLX5_SET(create_qp_in, in, wq_umem_valid, 1);
 672                 break;
 673         }
 674
 675         case MLX5_CMD_OP_CREATE_RQ:
 676         {
 677                 void *rqc, *wq;
 678
 679                 rqc = MLX5_ADDR_OF(create_rq_in, in, ctx);
 680                 wq  = MLX5_ADDR_OF(rqc, rqc, wq);
 681                 MLX5_SET(wq, wq, dbr_umem_valid, 1);
 682                 MLX5_SET(wq, wq, wq_umem_valid, 1);
 683                 break;
 684         }
 685
 686         case MLX5_CMD_OP_CREATE_SQ:
 687         {
 688                 void *sqc, *wq;
 689
 690                 sqc = MLX5_ADDR_OF(create_sq_in, in, ctx);
 691                 wq = MLX5_ADDR_OF(sqc, sqc, wq);
 692                 MLX5_SET(wq, wq, dbr_umem_valid, 1);
 693                 MLX5_SET(wq, wq, wq_umem_valid, 1);
 694                 break;
 695         }
 696
 697         case MLX5_CMD_OP_MODIFY_CQ:
 698                 MLX5_SET(modify_cq_in, in, cq_umem_valid, 1);
 699                 break;
 700
 701         case MLX5_CMD_OP_CREATE_RMP:
 702         {
 703                 void *rmpc, *wq;
 704
 705                 rmpc = MLX5_ADDR_OF(create_rmp_in, in, ctx);
 706                 wq = MLX5_ADDR_OF(rmpc, rmpc, wq);
 707                 MLX5_SET(wq, wq, dbr_umem_valid, 1);
 708                 MLX5_SET(wq, wq, wq_umem_valid, 1);
 709                 break;
 710         }
 711
 712         case MLX5_CMD_OP_CREATE_XRQ:
 713         {
 714                 void *xrqc, *wq;
 715
 716                 xrqc = MLX5_ADDR_OF(create_xrq_in, in, xrq_context);
 717                 wq = MLX5_ADDR_OF(xrqc, xrqc, wq);
 718                 MLX5_SET(wq, wq, dbr_umem_valid, 1);
 719                 MLX5_SET(wq, wq, wq_umem_valid, 1);
 720                 break;
 721         }
 722
 723         case MLX5_CMD_OP_CREATE_XRC_SRQ:
 724         {
 725                 void *xrc_srqc;
 726
 727                 MLX5_SET(create_xrc_srq_in, in, xrc_srq_umem_valid, 1);
 728                 xrc_srqc = MLX5_ADDR_OF(create_xrc_srq_in, in,
 729                                         xrc_srq_context_entry);
 730                 MLX5_SET(xrc_srqc, xrc_srqc, dbr_umem_valid, 1);
 731                 break;
 732         }
 733
 734         default:
 735                 return;
 736         }
 737 }
 738
 739 static bool devx_is_obj_create_cmd(const void *in, u16 *opcode)
 740 {
 741         *opcode = MLX5_GET(general_obj_in_cmd_hdr, in, opcode);
 742
 743         switch (*opcode) {
 744         case MLX5_CMD_OP_CREATE_GENERAL_OBJECT:
 745         case MLX5_CMD_OP_CREATE_MKEY:
 746         case MLX5_CMD_OP_CREATE_CQ:
 747         case MLX5_CMD_OP_ALLOC_PD:
 748         case MLX5_CMD_OP_ALLOC_TRANSPORT_DOMAIN:
 749         case MLX5_CMD_OP_CREATE_RMP:
 750         case MLX5_CMD_OP_CREATE_SQ:
 751         case MLX5_CMD_OP_CREATE_RQ:
 752         case MLX5_CMD_OP_CREATE_RQT:
 753         case MLX5_CMD_OP_CREATE_TIR:
 754         case MLX5_CMD_OP_CREATE_TIS:
 755         case MLX5_CMD_OP_ALLOC_Q_COUNTER:
 756         case MLX5_CMD_OP_CREATE_FLOW_TABLE:
 757         case MLX5_CMD_OP_CREATE_FLOW_GROUP:
 758         case MLX5_CMD_OP_ALLOC_FLOW_COUNTER:
 759         case MLX5_CMD_OP_ALLOC_PACKET_REFORMAT_CONTEXT:
 760         case MLX5_CMD_OP_ALLOC_MODIFY_HEADER_CONTEXT:
 761         case MLX5_CMD_OP_CREATE_SCHEDULING_ELEMENT:
 762         case MLX5_CMD_OP_ADD_VXLAN_UDP_DPORT:
 763         case MLX5_CMD_OP_SET_L2_TABLE_ENTRY:
 764         case MLX5_CMD_OP_CREATE_QP:
 765         case MLX5_CMD_OP_CREATE_SRQ:
 766         case MLX5_CMD_OP_CREATE_XRC_SRQ:
 767         case MLX5_CMD_OP_CREATE_DCT:
 768         case MLX5_CMD_OP_CREATE_XRQ:
 769         case MLX5_CMD_OP_ATTACH_TO_MCG:
 770         case MLX5_CMD_OP_ALLOC_XRCD:
 771                 return true;
 772         case MLX5_CMD_OP_SET_FLOW_TABLE_ENTRY:
 773         {
 774                 u16 op_mod = MLX5_GET(set_fte_in, in, op_mod);
 775                 if (op_mod == 0)
 776                         return true;
 777                 return false;
 778         }
 779         default:
 780                 return false;
 781         }
 782 }
 783
 784 static bool devx_is_obj_modify_cmd(const void *in)
 785 {
 786         u16 opcode = MLX5_GET(general_obj_in_cmd_hdr, in, opcode);
 787
 788         switch (opcode) {
 789         case MLX5_CMD_OP_MODIFY_GENERAL_OBJECT:
 790         case MLX5_CMD_OP_MODIFY_CQ:
 791         case MLX5_CMD_OP_MODIFY_RMP:
 792         case MLX5_CMD_OP_MODIFY_SQ:
 793         case MLX5_CMD_OP_MODIFY_RQ:
 794         case MLX5_CMD_OP_MODIFY_RQT:
 795         case MLX5_CMD_OP_MODIFY_TIR:
 796         case MLX5_CMD_OP_MODIFY_TIS:
 797         case MLX5_CMD_OP_MODIFY_FLOW_TABLE:
 798         case MLX5_CMD_OP_MODIFY_SCHEDULING_ELEMENT:
 799         case MLX5_CMD_OP_ADD_VXLAN_UDP_DPORT:
 800         case MLX5_CMD_OP_SET_L2_TABLE_ENTRY:
 801         case MLX5_CMD_OP_RST2INIT_QP:
 802         case MLX5_CMD_OP_INIT2RTR_QP:
 803         case MLX5_CMD_OP_RTR2RTS_QP:
 804         case MLX5_CMD_OP_RTS2RTS_QP:
 805         case MLX5_CMD_OP_SQERR2RTS_QP:
 806         case MLX5_CMD_OP_2ERR_QP:
 807         case MLX5_CMD_OP_2RST_QP:
 808         case MLX5_CMD_OP_ARM_XRC_SRQ:
 809         case MLX5_CMD_OP_ARM_RQ:
 810         case MLX5_CMD_OP_ARM_DCT_FOR_KEY_VIOLATION:
 811         case MLX5_CMD_OP_ARM_XRQ:
 812         case MLX5_CMD_OP_SET_XRQ_DC_PARAMS_ENTRY:
 813                 return true;
 814         case MLX5_CMD_OP_SET_FLOW_TABLE_ENTRY:
 815         {
 816                 u16 op_mod = MLX5_GET(set_fte_in, in, op_mod);
 817
 818                 if (op_mod == 1)
 819                         return true;
 820                 return false;
 821         }
 822         default:
 823                 return false;
 824         }
 825 }
 826
 827 static bool devx_is_obj_query_cmd(const void *in)
 828 {
 829         u16 opcode = MLX5_GET(general_obj_in_cmd_hdr, in, opcode);
 830
 831         switch (opcode) {
 832         case MLX5_CMD_OP_QUERY_GENERAL_OBJECT:
 833         case MLX5_CMD_OP_QUERY_MKEY:
 834         case MLX5_CMD_OP_QUERY_CQ:
 835         case MLX5_CMD_OP_QUERY_RMP:
 836         case MLX5_CMD_OP_QUERY_SQ:
 837         case MLX5_CMD_OP_QUERY_RQ:
 838         case MLX5_CMD_OP_QUERY_RQT:
 839         case MLX5_CMD_OP_QUERY_TIR:
 840         case MLX5_CMD_OP_QUERY_TIS:
 841         case MLX5_CMD_OP_QUERY_Q_COUNTER:
 842         case MLX5_CMD_OP_QUERY_FLOW_TABLE:
 843         case MLX5_CMD_OP_QUERY_FLOW_GROUP:
 844         case MLX5_CMD_OP_QUERY_FLOW_TABLE_ENTRY:
 845         case MLX5_CMD_OP_QUERY_FLOW_COUNTER:
 846         case MLX5_CMD_OP_QUERY_MODIFY_HEADER_CONTEXT:
 847         case MLX5_CMD_OP_QUERY_SCHEDULING_ELEMENT:
 848         case MLX5_CMD_OP_QUERY_L2_TABLE_ENTRY:
 849         case MLX5_CMD_OP_QUERY_QP:
 850         case MLX5_CMD_OP_QUERY_SRQ:
 851         case MLX5_CMD_OP_QUERY_XRC_SRQ:
 852         case MLX5_CMD_OP_QUERY_DCT:
 853         case MLX5_CMD_OP_QUERY_XRQ:
 854         case MLX5_CMD_OP_QUERY_XRQ_DC_PARAMS_ENTRY:
 855         case MLX5_CMD_OP_QUERY_XRQ_ERROR_PARAMS:
 856         case MLX5_CMD_OP_QUERY_PACKET_REFORMAT_CONTEXT:
 857                 return true;
 858         default:
 859                 return false;
 860         }
 861 }
 862
 863 static bool devx_is_whitelist_cmd(void *in)
 864 {
 865         u16 opcode = MLX5_GET(general_obj_in_cmd_hdr, in, opcode);
 866
 867         switch (opcode) {
 868         case MLX5_CMD_OP_QUERY_HCA_CAP:
 869         case MLX5_CMD_OP_QUERY_HCA_VPORT_CONTEXT:
 870         case MLX5_CMD_OP_QUERY_ESW_VPORT_CONTEXT:
 871                 return true;
 872         default:
 873                 return false;
 874         }
 875 }
 876
 877 static int devx_get_uid(struct mlx5_ib_ucontext *c, void *cmd_in)
 878 {
 879         if (devx_is_whitelist_cmd(cmd_in)) {
 880                 struct mlx5_ib_dev *dev;
 881
 882                 if (c->devx_uid)
 883                         return c->devx_uid;
 884
 885                 dev = to_mdev(c->ibucontext.device);
 886                 if (dev->devx_whitelist_uid)
 887                         return dev->devx_whitelist_uid;
 888
 889                 return -EOPNOTSUPP;
 890         }
 891
 892         if (!c->devx_uid)
 893                 return -EINVAL;
 894
 895         return c->devx_uid;
 896 }
 897
 898 static bool devx_is_general_cmd(void *in, struct mlx5_ib_dev *dev)
 899 {
 900         u16 opcode = MLX5_GET(general_obj_in_cmd_hdr, in, opcode);
 901
 902         /* Pass all cmds for vhca_tunnel as general, tracking is done in FW */
 903         if ((MLX5_CAP_GEN_64(dev->mdev, vhca_tunnel_commands) &&
 904              MLX5_GET(general_obj_in_cmd_hdr, in, vhca_tunnel_id)) ||
 905             (opcode >= MLX5_CMD_OP_GENERAL_START &&
 906              opcode < MLX5_CMD_OP_GENERAL_END))
 907                 return true;
 908
 909         switch (opcode) {
 910         case MLX5_CMD_OP_QUERY_HCA_CAP:
 911         case MLX5_CMD_OP_QUERY_HCA_VPORT_CONTEXT:
 912         case MLX5_CMD_OP_QUERY_ESW_VPORT_CONTEXT:
 913         case MLX5_CMD_OP_QUERY_VPORT_STATE:
 914         case MLX5_CMD_OP_QUERY_ADAPTER:
 915         case MLX5_CMD_OP_QUERY_ISSI:
 916         case MLX5_CMD_OP_QUERY_NIC_VPORT_CONTEXT:
 917         case MLX5_CMD_OP_QUERY_ROCE_ADDRESS:
 918         case MLX5_CMD_OP_QUERY_VNIC_ENV:
 919         case MLX5_CMD_OP_QUERY_VPORT_COUNTER:
 920         case MLX5_CMD_OP_GET_DROPPED_PACKET_LOG:
 921         case MLX5_CMD_OP_NOP:
 922         case MLX5_CMD_OP_QUERY_CONG_STATUS:
 923         case MLX5_CMD_OP_QUERY_CONG_PARAMS:
 924         case MLX5_CMD_OP_QUERY_CONG_STATISTICS:
 925                 return true;
 926         default:
 927                 return false;
 928         }
 929 }
 930
 931 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_QUERY_EQN)(
 932         struct uverbs_attr_bundle *attrs)
 933 {
 934         struct mlx5_ib_ucontext *c;
 935         struct mlx5_ib_dev *dev;
 936         int user_vector;
 937         int dev_eqn;
 938         unsigned int irqn;
 939         int err;
 940
 941         if (uverbs_copy_from(&user_vector, attrs,
 942                              MLX5_IB_ATTR_DEVX_QUERY_EQN_USER_VEC))
 943                 return -EFAULT;
 944
 945         c = devx_ufile2uctx(attrs);
 946         if (IS_ERR(c))
 947                 return PTR_ERR(c);
 948         dev = to_mdev(c->ibucontext.device);
 949
 950         err = mlx5_vector2eqn(dev->mdev, user_vector, &dev_eqn, &irqn);
 951         if (err < 0)
 952                 return err;
 953
 954         if (uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_QUERY_EQN_DEV_EQN,
 955                            &dev_eqn, sizeof(dev_eqn)))
 956                 return -EFAULT;
 957
 958         return 0;
 959 }
 960
 961 /*
 962  *Security note:
 963  * The hardware protection mechanism works like this: Each device object that
 964  * is subject to UAR doorbells (QP/SQ/CQ) gets a UAR ID (called uar_page in
 965  * the device specification manual) upon its creation. Then upon doorbell,
 966  * hardware fetches the object context for which the doorbell was rang, and
 967  * validates that the UAR through which the DB was rang matches the UAR ID
 968  * of the object.
 969  * If no match the doorbell is silently ignored by the hardware. Of course,
 970  * the user cannot ring a doorbell on a UAR that was not mapped to it.
 971  * Now in devx, as the devx kernel does not manipulate the QP/SQ/CQ command
 972  * mailboxes (except tagging them with UID), we expose to the user its UAR
 973  * ID, so it can embed it in these objects in the expected specification
 974  * format. So the only thing the user can do is hurt itself by creating a
 975  * QP/SQ/CQ with a UAR ID other than his, and then in this case other users
 976  * may ring a doorbell on its objects.
 977  * The consequence of that will be that another user can schedule a QP/SQ
 978  * of the buggy user for execution (just insert it to the hardware schedule
 979  * queue or arm its CQ for event generation), no further harm is expected.
 980  */
 981 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_QUERY_UAR)(
 982         struct uverbs_attr_bundle *attrs)
 983 {
 984         struct mlx5_ib_ucontext *c;
 985         struct mlx5_ib_dev *dev;
 986         u32 user_idx;
 987         s32 dev_idx;
 988
 989         c = devx_ufile2uctx(attrs);
 990         if (IS_ERR(c))
 991                 return PTR_ERR(c);
 992         dev = to_mdev(c->ibucontext.device);
 993
 994         if (uverbs_copy_from(&user_idx, attrs,
 995                              MLX5_IB_ATTR_DEVX_QUERY_UAR_USER_IDX))
 996                 return -EFAULT;
 997
 998         dev_idx = bfregn_to_uar_index(dev, &c->bfregi, user_idx, true);
 999         if (dev_idx < 0)
1000                 return dev_idx;
1001
1002         if (uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_QUERY_UAR_DEV_IDX,
1003                            &dev_idx, sizeof(dev_idx)))
1004                 return -EFAULT;
1005
1006         return 0;
1007 }
1008
1009 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_OTHER)(
1010         struct uverbs_attr_bundle *attrs)
1011 {
1012         struct mlx5_ib_ucontext *c;
1013         struct mlx5_ib_dev *dev;
1014         void *cmd_in = uverbs_attr_get_alloced_ptr(
1015                 attrs, MLX5_IB_ATTR_DEVX_OTHER_CMD_IN);
1016         int cmd_out_len = uverbs_attr_get_len(attrs,
1017                                         MLX5_IB_ATTR_DEVX_OTHER_CMD_OUT);
1018         void *cmd_out;
1019         int err;
1020         int uid;
1021
1022         c = devx_ufile2uctx(attrs);
1023         if (IS_ERR(c))
1024                 return PTR_ERR(c);
1025         dev = to_mdev(c->ibucontext.device);
1026
1027         uid = devx_get_uid(c, cmd_in);
1028         if (uid < 0)
1029                 return uid;
1030
1031         /* Only white list of some general HCA commands are allowed for this method. */
1032         if (!devx_is_general_cmd(cmd_in, dev))
1033                 return -EINVAL;
1034
1035         cmd_out = uverbs_zalloc(attrs, cmd_out_len);
1036         if (IS_ERR(cmd_out))
1037                 return PTR_ERR(cmd_out);
1038
1039         MLX5_SET(general_obj_in_cmd_hdr, cmd_in, uid, uid);
1040         err = mlx5_cmd_exec(dev->mdev, cmd_in,
1041                             uverbs_attr_get_len(attrs, MLX5_IB_ATTR_DEVX_OTHER_CMD_IN),
1042                             cmd_out, cmd_out_len);
1043         if (err)
1044                 return err;
1045
1046         return uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_OTHER_CMD_OUT, cmd_out,
1047                               cmd_out_len);
1048 }
1049
1050 static void devx_obj_build_destroy_cmd(void *in, void *out, void *din,
1051                                        u32 *dinlen,
1052                                        u32 *obj_id)
1053 {
1054         u16 obj_type = MLX5_GET(general_obj_in_cmd_hdr, in, obj_type);
1055         u16 uid = MLX5_GET(general_obj_in_cmd_hdr, in, uid);
1056
1057         *obj_id = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id);
1058         *dinlen = MLX5_ST_SZ_BYTES(general_obj_in_cmd_hdr);
1059
1060         MLX5_SET(general_obj_in_cmd_hdr, din, obj_id, *obj_id);
1061         MLX5_SET(general_obj_in_cmd_hdr, din, uid, uid);
1062
1063         switch (MLX5_GET(general_obj_in_cmd_hdr, in, opcode)) {
1064         case MLX5_CMD_OP_CREATE_GENERAL_OBJECT:
1065                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_GENERAL_OBJECT);
1066                 MLX5_SET(general_obj_in_cmd_hdr, din, obj_type, obj_type);
1067                 break;
1068
1069         case MLX5_CMD_OP_CREATE_UMEM:
1070                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1071                          MLX5_CMD_OP_DESTROY_UMEM);
1072                 break;
1073         case MLX5_CMD_OP_CREATE_MKEY:
1074                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_MKEY);
1075                 break;
1076         case MLX5_CMD_OP_CREATE_CQ:
1077                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
1078                 break;
1079         case MLX5_CMD_OP_ALLOC_PD:
1080                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DEALLOC_PD);
1081                 break;
1082         case MLX5_CMD_OP_ALLOC_TRANSPORT_DOMAIN:
1083                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1084                          MLX5_CMD_OP_DEALLOC_TRANSPORT_DOMAIN);
1085                 break;
1086         case MLX5_CMD_OP_CREATE_RMP:
1087                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_RMP);
1088                 break;
1089         case MLX5_CMD_OP_CREATE_SQ:
1090                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_SQ);
1091                 break;
1092         case MLX5_CMD_OP_CREATE_RQ:
1093                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_RQ);
1094                 break;
1095         case MLX5_CMD_OP_CREATE_RQT:
1096                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_RQT);
1097                 break;
1098         case MLX5_CMD_OP_CREATE_TIR:
1099                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_TIR);
1100                 break;
1101         case MLX5_CMD_OP_CREATE_TIS:
1102                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_TIS);
1103                 break;
1104         case MLX5_CMD_OP_ALLOC_Q_COUNTER:
1105                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1106                          MLX5_CMD_OP_DEALLOC_Q_COUNTER);
1107                 break;
1108         case MLX5_CMD_OP_CREATE_FLOW_TABLE:
1109                 *dinlen = MLX5_ST_SZ_BYTES(destroy_flow_table_in);
1110                 *obj_id = MLX5_GET(create_flow_table_out, out, table_id);
1111                 MLX5_SET(destroy_flow_table_in, din, other_vport,
1112                          MLX5_GET(create_flow_table_in,  in, other_vport));
1113                 MLX5_SET(destroy_flow_table_in, din, vport_number,
1114                          MLX5_GET(create_flow_table_in,  in, vport_number));
1115                 MLX5_SET(destroy_flow_table_in, din, table_type,
1116                          MLX5_GET(create_flow_table_in,  in, table_type));
1117                 MLX5_SET(destroy_flow_table_in, din, table_id, *obj_id);
1118                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1119                          MLX5_CMD_OP_DESTROY_FLOW_TABLE);
1120                 break;
1121         case MLX5_CMD_OP_CREATE_FLOW_GROUP:
1122                 *dinlen = MLX5_ST_SZ_BYTES(destroy_flow_group_in);
1123                 *obj_id = MLX5_GET(create_flow_group_out, out, group_id);
1124                 MLX5_SET(destroy_flow_group_in, din, other_vport,
1125                          MLX5_GET(create_flow_group_in, in, other_vport));
1126                 MLX5_SET(destroy_flow_group_in, din, vport_number,
1127                          MLX5_GET(create_flow_group_in, in, vport_number));
1128                 MLX5_SET(destroy_flow_group_in, din, table_type,
1129                          MLX5_GET(create_flow_group_in, in, table_type));
1130                 MLX5_SET(destroy_flow_group_in, din, table_id,
1131                          MLX5_GET(create_flow_group_in, in, table_id));
1132                 MLX5_SET(destroy_flow_group_in, din, group_id, *obj_id);
1133                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1134                          MLX5_CMD_OP_DESTROY_FLOW_GROUP);
1135                 break;
1136         case MLX5_CMD_OP_SET_FLOW_TABLE_ENTRY:
1137                 *dinlen = MLX5_ST_SZ_BYTES(delete_fte_in);
1138                 *obj_id = MLX5_GET(set_fte_in, in, flow_index);
1139                 MLX5_SET(delete_fte_in, din, other_vport,
1140                          MLX5_GET(set_fte_in,  in, other_vport));
1141                 MLX5_SET(delete_fte_in, din, vport_number,
1142                          MLX5_GET(set_fte_in, in, vport_number));
1143                 MLX5_SET(delete_fte_in, din, table_type,
1144                          MLX5_GET(set_fte_in, in, table_type));
1145                 MLX5_SET(delete_fte_in, din, table_id,
1146                          MLX5_GET(set_fte_in, in, table_id));
1147                 MLX5_SET(delete_fte_in, din, flow_index, *obj_id);
1148                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1149                          MLX5_CMD_OP_DELETE_FLOW_TABLE_ENTRY);
1150                 break;
1151         case MLX5_CMD_OP_ALLOC_FLOW_COUNTER:
1152                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1153                          MLX5_CMD_OP_DEALLOC_FLOW_COUNTER);
1154                 break;
1155         case MLX5_CMD_OP_ALLOC_PACKET_REFORMAT_CONTEXT:
1156                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1157                          MLX5_CMD_OP_DEALLOC_PACKET_REFORMAT_CONTEXT);
1158                 break;
1159         case MLX5_CMD_OP_ALLOC_MODIFY_HEADER_CONTEXT:
1160                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1161                          MLX5_CMD_OP_DEALLOC_MODIFY_HEADER_CONTEXT);
1162                 break;
1163         case MLX5_CMD_OP_CREATE_SCHEDULING_ELEMENT:
1164                 *dinlen = MLX5_ST_SZ_BYTES(destroy_scheduling_element_in);
1165                 *obj_id = MLX5_GET(create_scheduling_element_out, out,
1166                                    scheduling_element_id);
1167                 MLX5_SET(destroy_scheduling_element_in, din,
1168                          scheduling_hierarchy,
1169                          MLX5_GET(create_scheduling_element_in, in,
1170                                   scheduling_hierarchy));
1171                 MLX5_SET(destroy_scheduling_element_in, din,
1172                          scheduling_element_id, *obj_id);
1173                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1174                          MLX5_CMD_OP_DESTROY_SCHEDULING_ELEMENT);
1175                 break;
1176         case MLX5_CMD_OP_ADD_VXLAN_UDP_DPORT:
1177                 *dinlen = MLX5_ST_SZ_BYTES(delete_vxlan_udp_dport_in);
1178                 *obj_id = MLX5_GET(add_vxlan_udp_dport_in, in, vxlan_udp_port);
1179                 MLX5_SET(delete_vxlan_udp_dport_in, din, vxlan_udp_port, *obj_id);
1180                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1181                          MLX5_CMD_OP_DELETE_VXLAN_UDP_DPORT);
1182                 break;
1183         case MLX5_CMD_OP_SET_L2_TABLE_ENTRY:
1184                 *dinlen = MLX5_ST_SZ_BYTES(delete_l2_table_entry_in);
1185                 *obj_id = MLX5_GET(set_l2_table_entry_in, in, table_index);
1186                 MLX5_SET(delete_l2_table_entry_in, din, table_index, *obj_id);
1187                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1188                          MLX5_CMD_OP_DELETE_L2_TABLE_ENTRY);
1189                 break;
1190         case MLX5_CMD_OP_CREATE_QP:
1191                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_QP);
1192                 break;
1193         case MLX5_CMD_OP_CREATE_SRQ:
1194                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_SRQ);
1195                 break;
1196         case MLX5_CMD_OP_CREATE_XRC_SRQ:
1197                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode,
1198                          MLX5_CMD_OP_DESTROY_XRC_SRQ);
1199                 break;
1200         case MLX5_CMD_OP_CREATE_DCT:
1201                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_DCT);
1202                 break;
1203         case MLX5_CMD_OP_CREATE_XRQ:
1204                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DESTROY_XRQ);
1205                 break;
1206         case MLX5_CMD_OP_ATTACH_TO_MCG:
1207                 *dinlen = MLX5_ST_SZ_BYTES(detach_from_mcg_in);
1208                 MLX5_SET(detach_from_mcg_in, din, qpn,
1209                          MLX5_GET(attach_to_mcg_in, in, qpn));
1210                 memcpy(MLX5_ADDR_OF(detach_from_mcg_in, din, multicast_gid),
1211                        MLX5_ADDR_OF(attach_to_mcg_in, in, multicast_gid),
1212                        MLX5_FLD_SZ_BYTES(attach_to_mcg_in, multicast_gid));
1213                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DETACH_FROM_MCG);
1214                 break;
1215         case MLX5_CMD_OP_ALLOC_XRCD:
1216                 MLX5_SET(general_obj_in_cmd_hdr, din, opcode, MLX5_CMD_OP_DEALLOC_XRCD);
1217                 break;
1218         default:
1219                 /* The entry must match to one of the devx_is_obj_create_cmd */
1220                 WARN_ON(true);
1221                 break;
1222         }
1223 }
1224
1225 static int devx_handle_mkey_indirect(struct devx_obj *obj,
1226                                      struct mlx5_ib_dev *dev,
1227                                      void *in, void *out)
1228 {
1229         struct mlx5_ib_devx_mr *devx_mr = &obj->devx_mr;
1230         struct mlx5_core_mkey *mkey;
1231         void *mkc;
1232         u8 key;
1233
1234         mkey = &devx_mr->mmkey;
1235         mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
1236         key = MLX5_GET(mkc, mkc, mkey_7_0);
1237         mkey->key = mlx5_idx_to_mkey(
1238                         MLX5_GET(create_mkey_out, out, mkey_index)) | key;
1239         mkey->type = MLX5_MKEY_INDIRECT_DEVX;
1240         mkey->iova = MLX5_GET64(mkc, mkc, start_addr);
1241         mkey->size = MLX5_GET64(mkc, mkc, len);
1242         mkey->pd = MLX5_GET(mkc, mkc, pd);
1243         devx_mr->ndescs = MLX5_GET(mkc, mkc, translations_octword_size);
1244
1245         return xa_err(xa_store(&dev->mdev->priv.mkey_table,
1246                                mlx5_base_mkey(mkey->key), mkey, GFP_KERNEL));
1247 }
1248
1249 static int devx_handle_mkey_create(struct mlx5_ib_dev *dev,
1250                                    struct devx_obj *obj,
1251                                    void *in, int in_len)
1252 {
1253         int min_len = MLX5_BYTE_OFF(create_mkey_in, memory_key_mkey_entry) +
1254                         MLX5_FLD_SZ_BYTES(create_mkey_in,
1255                         memory_key_mkey_entry);
1256         void *mkc;
1257         u8 access_mode;
1258
1259         if (in_len < min_len)
1260                 return -EINVAL;
1261
1262         mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
1263
1264         access_mode = MLX5_GET(mkc, mkc, access_mode_1_0);
1265         access_mode |= MLX5_GET(mkc, mkc, access_mode_4_2) << 2;
1266
1267         if (access_mode == MLX5_MKC_ACCESS_MODE_KLMS ||
1268                 access_mode == MLX5_MKC_ACCESS_MODE_KSM) {
1269                 if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING))
1270                         obj->flags |= DEVX_OBJ_FLAGS_INDIRECT_MKEY;
1271                 return 0;
1272         }
1273
1274         MLX5_SET(create_mkey_in, in, mkey_umem_valid, 1);
1275         return 0;
1276 }
1277
1278 static void devx_free_indirect_mkey(struct rcu_head *rcu)
1279 {
1280         kfree(container_of(rcu, struct devx_obj, devx_mr.rcu));
1281 }
1282
1283 /* This function to delete from the radix tree needs to be called before
1284  * destroying the underlying mkey. Otherwise a race might occur in case that
1285  * other thread will get the same mkey before this one will be deleted,
1286  * in that case it will fail via inserting to the tree its own data.
1287  *
1288  * Note:
1289  * An error in the destroy is not expected unless there is some other indirect
1290  * mkey which points to this one. In a kernel cleanup flow it will be just
1291  * destroyed in the iterative destruction call. In a user flow, in case
1292  * the application didn't close in the expected order it's its own problem,
1293  * the mkey won't be part of the tree, in both cases the kernel is safe.
1294  */
1295 static void devx_cleanup_mkey(struct devx_obj *obj)
1296 {
1297         xa_erase(&obj->ib_dev->mdev->priv.mkey_table,
1298                  mlx5_base_mkey(obj->devx_mr.mmkey.key));
1299 }
1300
1301 static void devx_cleanup_subscription(struct mlx5_ib_dev *dev,
1302                                       struct devx_event_subscription *sub)
1303 {
1304         struct devx_event *event;
1305         struct devx_obj_event *xa_val_level2;
1306
1307         if (sub->is_cleaned)
1308                 return;
1309
1310         sub->is_cleaned = 1;
1311         list_del_rcu(&sub->xa_list);
1312
1313         if (list_empty(&sub->obj_list))
1314                 return;
1315
1316         list_del_rcu(&sub->obj_list);
1317         /* check whether key level 1 for this obj_sub_list is empty */
1318         event = xa_load(&dev->devx_event_table.event_xa,
1319                         sub->xa_key_level1);
1320         WARN_ON(!event);
1321
1322         xa_val_level2 = xa_load(&event->object_ids, sub->xa_key_level2);
1323         if (list_empty(&xa_val_level2->obj_sub_list)) {
1324                 xa_erase(&event->object_ids,
1325                          sub->xa_key_level2);
1326                 kfree_rcu(xa_val_level2, rcu);
1327         }
1328 }
1329
1330 static int devx_obj_cleanup(struct ib_uobject *uobject,
1331                             enum rdma_remove_reason why,
1332                             struct uverbs_attr_bundle *attrs)
1333 {
1334         u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
1335         struct mlx5_devx_event_table *devx_event_table;
1336         struct devx_obj *obj = uobject->object;
1337         struct devx_event_subscription *sub_entry, *tmp;
1338         struct mlx5_ib_dev *dev;
1339         int ret;
1340
1341         dev = mlx5_udata_to_mdev(&attrs->driver_udata);
1342         if (obj->flags & DEVX_OBJ_FLAGS_INDIRECT_MKEY)
1343                 devx_cleanup_mkey(obj);
1344
1345         if (obj->flags & DEVX_OBJ_FLAGS_DCT)
1346                 ret = mlx5_core_destroy_dct(obj->ib_dev->mdev, &obj->core_dct);
1347         else if (obj->flags & DEVX_OBJ_FLAGS_CQ)
1348                 ret = mlx5_core_destroy_cq(obj->ib_dev->mdev, &obj->core_cq);
1349         else
1350                 ret = mlx5_cmd_exec(obj->ib_dev->mdev, obj->dinbox,
1351                                     obj->dinlen, out, sizeof(out));
1352         if (ib_is_destroy_retryable(ret, why, uobject))
1353                 return ret;
1354
1355         devx_event_table = &dev->devx_event_table;
1356
1357         mutex_lock(&devx_event_table->event_xa_lock);
1358         list_for_each_entry_safe(sub_entry, tmp, &obj->event_sub, obj_list)
1359                 devx_cleanup_subscription(dev, sub_entry);
1360         mutex_unlock(&devx_event_table->event_xa_lock);
1361
1362         if (obj->flags & DEVX_OBJ_FLAGS_INDIRECT_MKEY) {
1363                 call_srcu(&dev->mr_srcu, &obj->devx_mr.rcu,
1364                           devx_free_indirect_mkey);
1365                 return ret;
1366         }
1367
1368         kfree(obj);
1369         return ret;
1370 }
1371
1372 static void devx_cq_comp(struct mlx5_core_cq *mcq, struct mlx5_eqe *eqe)
1373 {
1374         struct devx_obj *obj = container_of(mcq, struct devx_obj, core_cq);
1375         struct mlx5_devx_event_table *table;
1376         struct devx_event *event;
1377         struct devx_obj_event *obj_event;
1378         u32 obj_id = mcq->cqn;
1379
1380         table = &obj->ib_dev->devx_event_table;
1381         rcu_read_lock();
1382         event = xa_load(&table->event_xa, MLX5_EVENT_TYPE_COMP);
1383         if (!event)
1384                 goto out;
1385
1386         obj_event = xa_load(&event->object_ids, obj_id);
1387         if (!obj_event)
1388                 goto out;
1389
1390         dispatch_event_fd(&obj_event->obj_sub_list, eqe);
1391 out:
1392         rcu_read_unlock();
1393 }
1394
1395 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_OBJ_CREATE)(
1396         struct uverbs_attr_bundle *attrs)
1397 {
1398         void *cmd_in = uverbs_attr_get_alloced_ptr(attrs, MLX5_IB_ATTR_DEVX_OBJ_CREATE_CMD_IN);
1399         int cmd_out_len =  uverbs_attr_get_len(attrs,
1400                                         MLX5_IB_ATTR_DEVX_OBJ_CREATE_CMD_OUT);
1401         int cmd_in_len = uverbs_attr_get_len(attrs,
1402                                         MLX5_IB_ATTR_DEVX_OBJ_CREATE_CMD_IN);
1403         void *cmd_out;
1404         struct ib_uobject *uobj = uverbs_attr_get_uobject(
1405                 attrs, MLX5_IB_ATTR_DEVX_OBJ_CREATE_HANDLE);
1406         struct mlx5_ib_ucontext *c = rdma_udata_to_drv_context(
1407                 &attrs->driver_udata, struct mlx5_ib_ucontext, ibucontext);
1408         struct mlx5_ib_dev *dev = to_mdev(c->ibucontext.device);
1409         u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
1410         struct devx_obj *obj;
1411         u16 obj_type = 0;
1412         int err;
1413         int uid;
1414         u32 obj_id;
1415         u16 opcode;
1416
1417         if (MLX5_GET(general_obj_in_cmd_hdr, cmd_in, vhca_tunnel_id))
1418                 return -EINVAL;
1419
1420         uid = devx_get_uid(c, cmd_in);
1421         if (uid < 0)
1422                 return uid;
1423
1424         if (!devx_is_obj_create_cmd(cmd_in, &opcode))
1425                 return -EINVAL;
1426
1427         cmd_out = uverbs_zalloc(attrs, cmd_out_len);
1428         if (IS_ERR(cmd_out))
1429                 return PTR_ERR(cmd_out);
1430
1431         obj = kzalloc(sizeof(struct devx_obj), GFP_KERNEL);
1432         if (!obj)
1433                 return -ENOMEM;
1434
1435         MLX5_SET(general_obj_in_cmd_hdr, cmd_in, uid, uid);
1436         if (opcode == MLX5_CMD_OP_CREATE_MKEY) {
1437                 err = devx_handle_mkey_create(dev, obj, cmd_in, cmd_in_len);
1438                 if (err)
1439                         goto obj_free;
1440         } else {
1441                 devx_set_umem_valid(cmd_in);
1442         }
1443
1444         if (opcode == MLX5_CMD_OP_CREATE_DCT) {
1445                 obj->flags |= DEVX_OBJ_FLAGS_DCT;
1446                 err = mlx5_core_create_dct(dev->mdev, &obj->core_dct,
1447                                            cmd_in, cmd_in_len,
1448                                            cmd_out, cmd_out_len);
1449         } else if (opcode == MLX5_CMD_OP_CREATE_CQ) {
1450                 obj->flags |= DEVX_OBJ_FLAGS_CQ;
1451                 obj->core_cq.comp = devx_cq_comp;
1452                 err = mlx5_core_create_cq(dev->mdev, &obj->core_cq,
1453                                           cmd_in, cmd_in_len, cmd_out,
1454                                           cmd_out_len);
1455         } else {
1456                 err = mlx5_cmd_exec(dev->mdev, cmd_in,
1457                                     cmd_in_len,
1458                                     cmd_out, cmd_out_len);
1459         }
1460
1461         if (err)
1462                 goto obj_free;
1463
1464         uobj->object = obj;
1465         INIT_LIST_HEAD(&obj->event_sub);
1466         obj->ib_dev = dev;
1467         devx_obj_build_destroy_cmd(cmd_in, cmd_out, obj->dinbox, &obj->dinlen,
1468                                    &obj_id);
1469         WARN_ON(obj->dinlen > MLX5_MAX_DESTROY_INBOX_SIZE_DW * sizeof(u32));
1470
1471         if (obj->flags & DEVX_OBJ_FLAGS_INDIRECT_MKEY) {
1472                 err = devx_handle_mkey_indirect(obj, dev, cmd_in, cmd_out);
1473                 if (err)
1474                         goto obj_destroy;
1475         }
1476
1477         err = uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_OBJ_CREATE_CMD_OUT, cmd_out, cmd_out_len);
1478         if (err)
1479                 goto err_copy;
1480
1481         if (opcode == MLX5_CMD_OP_CREATE_GENERAL_OBJECT)
1482                 obj_type = MLX5_GET(general_obj_in_cmd_hdr, cmd_in, obj_type);
1483
1484         obj->obj_id = get_enc_obj_id(opcode | obj_type << 16, obj_id);
1485
1486         return 0;
1487
1488 err_copy:
1489         if (obj->flags & DEVX_OBJ_FLAGS_INDIRECT_MKEY)
1490                 devx_cleanup_mkey(obj);
1491 obj_destroy:
1492         if (obj->flags & DEVX_OBJ_FLAGS_DCT)
1493                 mlx5_core_destroy_dct(obj->ib_dev->mdev, &obj->core_dct);
1494         else if (obj->flags & DEVX_OBJ_FLAGS_CQ)
1495                 mlx5_core_destroy_cq(obj->ib_dev->mdev, &obj->core_cq);
1496         else
1497                 mlx5_cmd_exec(obj->ib_dev->mdev, obj->dinbox, obj->dinlen, out,
1498                               sizeof(out));
1499 obj_free:
1500         kfree(obj);
1501         return err;
1502 }
1503
1504 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_OBJ_MODIFY)(
1505         struct uverbs_attr_bundle *attrs)
1506 {
1507         void *cmd_in = uverbs_attr_get_alloced_ptr(attrs, MLX5_IB_ATTR_DEVX_OBJ_MODIFY_CMD_IN);
1508         int cmd_out_len = uverbs_attr_get_len(attrs,
1509                                         MLX5_IB_ATTR_DEVX_OBJ_MODIFY_CMD_OUT);
1510         struct ib_uobject *uobj = uverbs_attr_get_uobject(attrs,
1511                                                           MLX5_IB_ATTR_DEVX_OBJ_MODIFY_HANDLE);
1512         struct mlx5_ib_ucontext *c = rdma_udata_to_drv_context(
1513                 &attrs->driver_udata, struct mlx5_ib_ucontext, ibucontext);
1514         struct mlx5_ib_dev *mdev = to_mdev(c->ibucontext.device);
1515         void *cmd_out;
1516         int err;
1517         int uid;
1518
1519         if (MLX5_GET(general_obj_in_cmd_hdr, cmd_in, vhca_tunnel_id))
1520                 return -EINVAL;
1521
1522         uid = devx_get_uid(c, cmd_in);
1523         if (uid < 0)
1524                 return uid;
1525
1526         if (!devx_is_obj_modify_cmd(cmd_in))
1527                 return -EINVAL;
1528
1529         if (!devx_is_valid_obj_id(attrs, uobj, cmd_in))
1530                 return -EINVAL;
1531
1532         cmd_out = uverbs_zalloc(attrs, cmd_out_len);
1533         if (IS_ERR(cmd_out))
1534                 return PTR_ERR(cmd_out);
1535
1536         MLX5_SET(general_obj_in_cmd_hdr, cmd_in, uid, uid);
1537         devx_set_umem_valid(cmd_in);
1538
1539         err = mlx5_cmd_exec(mdev->mdev, cmd_in,
1540                             uverbs_attr_get_len(attrs, MLX5_IB_ATTR_DEVX_OBJ_MODIFY_CMD_IN),
1541                             cmd_out, cmd_out_len);
1542         if (err)
1543                 return err;
1544
1545         return uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_OBJ_MODIFY_CMD_OUT,
1546                               cmd_out, cmd_out_len);
1547 }
1548
1549 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_OBJ_QUERY)(
1550         struct uverbs_attr_bundle *attrs)
1551 {
1552         void *cmd_in = uverbs_attr_get_alloced_ptr(attrs, MLX5_IB_ATTR_DEVX_OBJ_QUERY_CMD_IN);
1553         int cmd_out_len = uverbs_attr_get_len(attrs,
1554                                               MLX5_IB_ATTR_DEVX_OBJ_QUERY_CMD_OUT);
1555         struct ib_uobject *uobj = uverbs_attr_get_uobject(attrs,
1556                                                           MLX5_IB_ATTR_DEVX_OBJ_QUERY_HANDLE);
1557         struct mlx5_ib_ucontext *c = rdma_udata_to_drv_context(
1558                 &attrs->driver_udata, struct mlx5_ib_ucontext, ibucontext);
1559         void *cmd_out;
1560         int err;
1561         int uid;
1562         struct mlx5_ib_dev *mdev = to_mdev(c->ibucontext.device);
1563
1564         if (MLX5_GET(general_obj_in_cmd_hdr, cmd_in, vhca_tunnel_id))
1565                 return -EINVAL;
1566
1567         uid = devx_get_uid(c, cmd_in);
1568         if (uid < 0)
1569                 return uid;
1570
1571         if (!devx_is_obj_query_cmd(cmd_in))
1572                 return -EINVAL;
1573
1574         if (!devx_is_valid_obj_id(attrs, uobj, cmd_in))
1575                 return -EINVAL;
1576
1577         cmd_out = uverbs_zalloc(attrs, cmd_out_len);
1578         if (IS_ERR(cmd_out))
1579                 return PTR_ERR(cmd_out);
1580
1581         MLX5_SET(general_obj_in_cmd_hdr, cmd_in, uid, uid);
1582         err = mlx5_cmd_exec(mdev->mdev, cmd_in,
1583                             uverbs_attr_get_len(attrs, MLX5_IB_ATTR_DEVX_OBJ_QUERY_CMD_IN),
1584                             cmd_out, cmd_out_len);
1585         if (err)
1586                 return err;
1587
1588         return uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_OBJ_QUERY_CMD_OUT,
1589                               cmd_out, cmd_out_len);
1590 }
1591
1592 struct devx_async_event_queue {
1593         spinlock_t              lock;
1594         wait_queue_head_t       poll_wait;
1595         struct list_head        event_list;
1596         atomic_t                bytes_in_use;
1597         u8                      is_destroyed:1;
1598 };
1599
1600 struct devx_async_cmd_event_file {
1601         struct ib_uobject               uobj;
1602         struct devx_async_event_queue   ev_queue;
1603         struct mlx5_async_ctx           async_ctx;
1604 };
1605
1606 static void devx_init_event_queue(struct devx_async_event_queue *ev_queue)
1607 {
1608         spin_lock_init(&ev_queue->lock);
1609         INIT_LIST_HEAD(&ev_queue->event_list);
1610         init_waitqueue_head(&ev_queue->poll_wait);
1611         atomic_set(&ev_queue->bytes_in_use, 0);
1612         ev_queue->is_destroyed = 0;
1613 }
1614
1615 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_ASYNC_CMD_FD_ALLOC)(
1616         struct uverbs_attr_bundle *attrs)
1617 {
1618         struct devx_async_cmd_event_file *ev_file;
1619
1620         struct ib_uobject *uobj = uverbs_attr_get_uobject(
1621                 attrs, MLX5_IB_ATTR_DEVX_ASYNC_CMD_FD_ALLOC_HANDLE);
1622         struct mlx5_ib_dev *mdev = mlx5_udata_to_mdev(&attrs->driver_udata);
1623
1624         ev_file = container_of(uobj, struct devx_async_cmd_event_file,
1625                                uobj);
1626         devx_init_event_queue(&ev_file->ev_queue);
1627         mlx5_cmd_init_async_ctx(mdev->mdev, &ev_file->async_ctx);
1628         return 0;
1629 }
1630
1631 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_ASYNC_EVENT_FD_ALLOC)(
1632         struct uverbs_attr_bundle *attrs)
1633 {
1634         struct ib_uobject *uobj = uverbs_attr_get_uobject(
1635                 attrs, MLX5_IB_ATTR_DEVX_ASYNC_EVENT_FD_ALLOC_HANDLE);
1636         struct devx_async_event_file *ev_file;
1637         struct mlx5_ib_ucontext *c = rdma_udata_to_drv_context(
1638                 &attrs->driver_udata, struct mlx5_ib_ucontext, ibucontext);
1639         struct mlx5_ib_dev *dev = to_mdev(c->ibucontext.device);
1640         u32 flags;
1641         int err;
1642
1643         err = uverbs_get_flags32(&flags, attrs,
1644                 MLX5_IB_ATTR_DEVX_ASYNC_EVENT_FD_ALLOC_FLAGS,
1645                 MLX5_IB_UAPI_DEVX_CR_EV_CH_FLAGS_OMIT_DATA);
1646
1647         if (err)
1648                 return err;
1649
1650         ev_file = container_of(uobj, struct devx_async_event_file,
1651                                uobj);
1652         spin_lock_init(&ev_file->lock);
1653         INIT_LIST_HEAD(&ev_file->event_list);
1654         init_waitqueue_head(&ev_file->poll_wait);
1655         if (flags & MLX5_IB_UAPI_DEVX_CR_EV_CH_FLAGS_OMIT_DATA)
1656                 ev_file->omit_data = 1;
1657         INIT_LIST_HEAD(&ev_file->subscribed_events_list);
1658         ev_file->dev = dev;
1659         get_device(&dev->ib_dev.dev);
1660         return 0;
1661 }
1662
1663 static void devx_query_callback(int status, struct mlx5_async_work *context)
1664 {
1665         struct devx_async_data *async_data =
1666                 container_of(context, struct devx_async_data, cb_work);
1667         struct ib_uobject *fd_uobj = async_data->fd_uobj;
1668         struct devx_async_cmd_event_file *ev_file;
1669         struct devx_async_event_queue *ev_queue;
1670         unsigned long flags;
1671
1672         ev_file = container_of(fd_uobj, struct devx_async_cmd_event_file,
1673                                uobj);
1674         ev_queue = &ev_file->ev_queue;
1675
1676         spin_lock_irqsave(&ev_queue->lock, flags);
1677         list_add_tail(&async_data->list, &ev_queue->event_list);
1678         spin_unlock_irqrestore(&ev_queue->lock, flags);
1679
1680         wake_up_interruptible(&ev_queue->poll_wait);
1681         fput(fd_uobj->object);
1682 }
1683
1684 #define MAX_ASYNC_BYTES_IN_USE (1024 * 1024) /* 1MB */
1685
1686 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_OBJ_ASYNC_QUERY)(
1687         struct uverbs_attr_bundle *attrs)
1688 {
1689         void *cmd_in = uverbs_attr_get_alloced_ptr(attrs,
1690                                 MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_CMD_IN);
1691         struct ib_uobject *uobj = uverbs_attr_get_uobject(
1692                                 attrs,
1693                                 MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_HANDLE);
1694         u16 cmd_out_len;
1695         struct mlx5_ib_ucontext *c = rdma_udata_to_drv_context(
1696                 &attrs->driver_udata, struct mlx5_ib_ucontext, ibucontext);
1697         struct ib_uobject *fd_uobj;
1698         int err;
1699         int uid;
1700         struct mlx5_ib_dev *mdev = to_mdev(c->ibucontext.device);
1701         struct devx_async_cmd_event_file *ev_file;
1702         struct devx_async_data *async_data;
1703
1704         if (MLX5_GET(general_obj_in_cmd_hdr, cmd_in, vhca_tunnel_id))
1705                 return -EINVAL;
1706
1707         uid = devx_get_uid(c, cmd_in);
1708         if (uid < 0)
1709                 return uid;
1710
1711         if (!devx_is_obj_query_cmd(cmd_in))
1712                 return -EINVAL;
1713
1714         err = uverbs_get_const(&cmd_out_len, attrs,
1715                                MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_OUT_LEN);
1716         if (err)
1717                 return err;
1718
1719         if (!devx_is_valid_obj_id(attrs, uobj, cmd_in))
1720                 return -EINVAL;
1721
1722         fd_uobj = uverbs_attr_get_uobject(attrs,
1723                                 MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_FD);
1724         if (IS_ERR(fd_uobj))
1725                 return PTR_ERR(fd_uobj);
1726
1727         ev_file = container_of(fd_uobj, struct devx_async_cmd_event_file,
1728                                uobj);
1729
1730         if (atomic_add_return(cmd_out_len, &ev_file->ev_queue.bytes_in_use) >
1731                         MAX_ASYNC_BYTES_IN_USE) {
1732                 atomic_sub(cmd_out_len, &ev_file->ev_queue.bytes_in_use);
1733                 return -EAGAIN;
1734         }
1735
1736         async_data = kvzalloc(struct_size(async_data, hdr.out_data,
1737                                           cmd_out_len), GFP_KERNEL);
1738         if (!async_data) {
1739                 err = -ENOMEM;
1740                 goto sub_bytes;
1741         }
1742
1743         err = uverbs_copy_from(&async_data->hdr.wr_id, attrs,
1744                                MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_WR_ID);
1745         if (err)
1746                 goto free_async;
1747
1748         async_data->cmd_out_len = cmd_out_len;
1749         async_data->mdev = mdev;
1750         async_data->fd_uobj = fd_uobj;
1751
1752         get_file(fd_uobj->object);
1753         MLX5_SET(general_obj_in_cmd_hdr, cmd_in, uid, uid);
1754         err = mlx5_cmd_exec_cb(&ev_file->async_ctx, cmd_in,
1755                     uverbs_attr_get_len(attrs,
1756                                 MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_CMD_IN),
1757                     async_data->hdr.out_data,
1758                     async_data->cmd_out_len,
1759                     devx_query_callback, &async_data->cb_work);
1760
1761         if (err)
1762                 goto cb_err;
1763
1764         return 0;
1765
1766 cb_err:
1767         fput(fd_uobj->object);
1768 free_async:
1769         kvfree(async_data);
1770 sub_bytes:
1771         atomic_sub(cmd_out_len, &ev_file->ev_queue.bytes_in_use);
1772         return err;
1773 }
1774
1775 static void
1776 subscribe_event_xa_dealloc(struct mlx5_devx_event_table *devx_event_table,
1777                            u32 key_level1,
1778                            bool is_level2,
1779                            u32 key_level2)
1780 {
1781         struct devx_event *event;
1782         struct devx_obj_event *xa_val_level2;
1783
1784         /* Level 1 is valid for future use, no need to free */
1785         if (!is_level2)
1786                 return;
1787
1788         event = xa_load(&devx_event_table->event_xa, key_level1);
1789         WARN_ON(!event);
1790
1791         xa_val_level2 = xa_load(&event->object_ids,
1792                                 key_level2);
1793         if (list_empty(&xa_val_level2->obj_sub_list)) {
1794                 xa_erase(&event->object_ids,
1795                          key_level2);
1796                 kfree_rcu(xa_val_level2, rcu);
1797         }
1798 }
1799
1800 static int
1801 subscribe_event_xa_alloc(struct mlx5_devx_event_table *devx_event_table,
1802                          u32 key_level1,
1803                          bool is_level2,
1804                          u32 key_level2)
1805 {
1806         struct devx_obj_event *obj_event;
1807         struct devx_event *event;
1808         int err;
1809
1810         event = xa_load(&devx_event_table->event_xa, key_level1);
1811         if (!event) {
1812                 event = kzalloc(sizeof(*event), GFP_KERNEL);
1813                 if (!event)
1814                         return -ENOMEM;
1815
1816                 INIT_LIST_HEAD(&event->unaffiliated_list);
1817                 xa_init(&event->object_ids);
1818
1819                 err = xa_insert(&devx_event_table->event_xa,
1820                                 key_level1,
1821                                 event,
1822                                 GFP_KERNEL);
1823                 if (err) {
1824                         kfree(event);
1825                         return err;
1826                 }
1827         }
1828
1829         if (!is_level2)
1830                 return 0;
1831
1832         obj_event = xa_load(&event->object_ids, key_level2);
1833         if (!obj_event) {
1834                 obj_event = kzalloc(sizeof(*obj_event), GFP_KERNEL);
1835                 if (!obj_event)
1836                         /* Level1 is valid for future use, no need to free */
1837                         return -ENOMEM;
1838
1839                 err = xa_insert(&event->object_ids,
1840                                 key_level2,
1841                                 obj_event,
1842                                 GFP_KERNEL);
1843                 if (err)
1844                         return err;
1845                 INIT_LIST_HEAD(&obj_event->obj_sub_list);
1846         }
1847
1848         return 0;
1849 }
1850
1851 static bool is_valid_events_legacy(int num_events, u16 *event_type_num_list,
1852                                    struct devx_obj *obj)
1853 {
1854         int i;
1855
1856         for (i = 0; i < num_events; i++) {
1857                 if (obj) {
1858                         if (!is_legacy_obj_event_num(event_type_num_list[i]))
1859                                 return false;
1860                 } else if (!is_legacy_unaffiliated_event_num(
1861                                 event_type_num_list[i])) {
1862                         return false;
1863                 }
1864         }
1865
1866         return true;
1867 }
1868
1869 #define MAX_SUPP_EVENT_NUM 255
1870 static bool is_valid_events(struct mlx5_core_dev *dev,
1871                             int num_events, u16 *event_type_num_list,
1872                             struct devx_obj *obj)
1873 {
1874         __be64 *aff_events;
1875         __be64 *unaff_events;
1876         int mask_entry;
1877         int mask_bit;
1878         int i;
1879
1880         if (MLX5_CAP_GEN(dev, event_cap)) {
1881                 aff_events = MLX5_CAP_DEV_EVENT(dev,
1882                                                 user_affiliated_events);
1883                 unaff_events = MLX5_CAP_DEV_EVENT(dev,
1884                                                   user_unaffiliated_events);
1885         } else {
1886                 return is_valid_events_legacy(num_events, event_type_num_list,
1887                                               obj);
1888         }
1889
1890         for (i = 0; i < num_events; i++) {
1891                 if (event_type_num_list[i] > MAX_SUPP_EVENT_NUM)
1892                         return false;
1893
1894                 mask_entry = event_type_num_list[i] / 64;
1895                 mask_bit = event_type_num_list[i] % 64;
1896
1897                 if (obj) {
1898                         /* CQ completion */
1899                         if (event_type_num_list[i] == 0)
1900                                 continue;
1901
1902                         if (!(be64_to_cpu(aff_events[mask_entry]) &
1903                                         (1ull << mask_bit)))
1904                                 return false;
1905
1906                         continue;
1907                 }
1908
1909                 if (!(be64_to_cpu(unaff_events[mask_entry]) &
1910                                 (1ull << mask_bit)))
1911                         return false;
1912         }
1913
1914         return true;
1915 }
1916
1917 #define MAX_NUM_EVENTS 16
1918 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT)(
1919         struct uverbs_attr_bundle *attrs)
1920 {
1921         struct ib_uobject *devx_uobj = uverbs_attr_get_uobject(
1922                                 attrs,
1923                                 MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_OBJ_HANDLE);
1924         struct mlx5_ib_ucontext *c = rdma_udata_to_drv_context(
1925                 &attrs->driver_udata, struct mlx5_ib_ucontext, ibucontext);
1926         struct mlx5_ib_dev *dev = to_mdev(c->ibucontext.device);
1927         struct ib_uobject *fd_uobj;
1928         struct devx_obj *obj = NULL;
1929         struct devx_async_event_file *ev_file;
1930         struct mlx5_devx_event_table *devx_event_table = &dev->devx_event_table;
1931         u16 *event_type_num_list;
1932         struct devx_event_subscription *event_sub, *tmp_sub;
1933         struct list_head sub_list;
1934         int redirect_fd;
1935         bool use_eventfd = false;
1936         int num_events;
1937         int num_alloc_xa_entries = 0;
1938         u16 obj_type = 0;
1939         u64 cookie = 0;
1940         u32 obj_id = 0;
1941         int err;
1942         int i;
1943
1944         if (!c->devx_uid)
1945                 return -EINVAL;
1946
1947         if (!IS_ERR(devx_uobj)) {
1948                 obj = (struct devx_obj *)devx_uobj->object;
1949                 if (obj)
1950                         obj_id = get_dec_obj_id(obj->obj_id);
1951         }
1952
1953         fd_uobj = uverbs_attr_get_uobject(attrs,
1954                                 MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_FD_HANDLE);
1955         if (IS_ERR(fd_uobj))
1956                 return PTR_ERR(fd_uobj);
1957
1958         ev_file = container_of(fd_uobj, struct devx_async_event_file,
1959                                uobj);
1960
1961         if (uverbs_attr_is_valid(attrs,
1962                                  MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_FD_NUM)) {
1963                 err = uverbs_copy_from(&redirect_fd, attrs,
1964                                MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_FD_NUM);
1965                 if (err)
1966                         return err;
1967
1968                 use_eventfd = true;
1969         }
1970
1971         if (uverbs_attr_is_valid(attrs,
1972                                  MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_COOKIE)) {
1973                 if (use_eventfd)
1974                         return -EINVAL;
1975
1976                 err = uverbs_copy_from(&cookie, attrs,
1977                                 MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_COOKIE);
1978                 if (err)
1979                         return err;
1980         }
1981
1982         num_events = uverbs_attr_ptr_get_array_size(
1983                 attrs, MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_TYPE_NUM_LIST,
1984                 sizeof(u16));
1985
1986         if (num_events < 0)
1987                 return num_events;
1988
1989         if (num_events > MAX_NUM_EVENTS)
1990                 return -EINVAL;
1991
1992         event_type_num_list = uverbs_attr_get_alloced_ptr(attrs,
1993                         MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_TYPE_NUM_LIST);
1994
1995         if (!is_valid_events(dev->mdev, num_events, event_type_num_list, obj))
1996                 return -EINVAL;
1997
1998         INIT_LIST_HEAD(&sub_list);
1999
2000         /* Protect from concurrent subscriptions to same XA entries to allow
2001          * both to succeed
2002          */
2003         mutex_lock(&devx_event_table->event_xa_lock);
2004         for (i = 0; i < num_events; i++) {
2005                 u32 key_level1;
2006
2007                 if (obj)
2008                         obj_type = get_dec_obj_type(obj,
2009                                                     event_type_num_list[i]);
2010                 key_level1 = event_type_num_list[i] | obj_type << 16;
2011
2012                 err = subscribe_event_xa_alloc(devx_event_table,
2013                                                key_level1,
2014                                                obj,
2015                                                obj_id);
2016                 if (err)
2017                         goto err;
2018
2019                 num_alloc_xa_entries++;
2020                 event_sub = kzalloc(sizeof(*event_sub), GFP_KERNEL);
2021                 if (!event_sub)
2022                         goto err;
2023
2024                 list_add_tail(&event_sub->event_list, &sub_list);
2025                 if (use_eventfd) {
2026                         event_sub->eventfd =
2027                                 eventfd_ctx_fdget(redirect_fd);
2028
2029                         if (IS_ERR(event_sub)) {
2030                                 err = PTR_ERR(event_sub->eventfd);
2031                                 event_sub->eventfd = NULL;
2032                                 goto err;
2033                         }
2034                 }
2035
2036                 event_sub->cookie = cookie;
2037                 event_sub->ev_file = ev_file;
2038                 event_sub->filp = fd_uobj->object;
2039                 /* May be needed upon cleanup the devx object/subscription */
2040                 event_sub->xa_key_level1 = key_level1;
2041                 event_sub->xa_key_level2 = obj_id;
2042                 INIT_LIST_HEAD(&event_sub->obj_list);
2043         }
2044
2045         /* Once all the allocations and the XA data insertions were done we
2046          * can go ahead and add all the subscriptions to the relevant lists
2047          * without concern of a failure.
2048          */
2049         list_for_each_entry_safe(event_sub, tmp_sub, &sub_list, event_list) {
2050                 struct devx_event *event;
2051                 struct devx_obj_event *obj_event;
2052
2053                 list_del_init(&event_sub->event_list);
2054
2055                 spin_lock_irq(&ev_file->lock);
2056                 list_add_tail_rcu(&event_sub->file_list,
2057                                   &ev_file->subscribed_events_list);
2058                 spin_unlock_irq(&ev_file->lock);
2059
2060                 event = xa_load(&devx_event_table->event_xa,
2061                                 event_sub->xa_key_level1);
2062                 WARN_ON(!event);
2063
2064                 if (!obj) {
2065                         list_add_tail_rcu(&event_sub->xa_list,
2066                                           &event->unaffiliated_list);
2067                         continue;
2068                 }
2069
2070                 obj_event = xa_load(&event->object_ids, obj_id);
2071                 WARN_ON(!obj_event);
2072                 list_add_tail_rcu(&event_sub->xa_list,
2073                                   &obj_event->obj_sub_list);
2074                 list_add_tail_rcu(&event_sub->obj_list,
2075                                   &obj->event_sub);
2076         }
2077
2078         mutex_unlock(&devx_event_table->event_xa_lock);
2079         return 0;
2080
2081 err:
2082         list_for_each_entry_safe(event_sub, tmp_sub, &sub_list, event_list) {
2083                 list_del(&event_sub->event_list);
2084
2085                 subscribe_event_xa_dealloc(devx_event_table,
2086                                            event_sub->xa_key_level1,
2087                                            obj,
2088                                            obj_id);
2089
2090                 if (event_sub->eventfd)
2091                         eventfd_ctx_put(event_sub->eventfd);
2092
2093                 kfree(event_sub);
2094         }
2095
2096         mutex_unlock(&devx_event_table->event_xa_lock);
2097         return err;
2098 }
2099
2100 static int devx_umem_get(struct mlx5_ib_dev *dev, struct ib_ucontext *ucontext,
2101                          struct uverbs_attr_bundle *attrs,
2102                          struct devx_umem *obj)
2103 {
2104         u64 addr;
2105         size_t size;
2106         u32 access;
2107         int npages;
2108         int err;
2109         u32 page_mask;
2110
2111         if (uverbs_copy_from(&addr, attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_ADDR) ||
2112             uverbs_copy_from(&size, attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_LEN))
2113                 return -EFAULT;
2114
2115         err = uverbs_get_flags32(&access, attrs,
2116                                  MLX5_IB_ATTR_DEVX_UMEM_REG_ACCESS,
2117                                  IB_ACCESS_LOCAL_WRITE |
2118                                  IB_ACCESS_REMOTE_WRITE |
2119                                  IB_ACCESS_REMOTE_READ);
2120         if (err)
2121                 return err;
2122
2123         err = ib_check_mr_access(access);
2124         if (err)
2125                 return err;
2126
2127         obj->umem = ib_umem_get(&attrs->driver_udata, addr, size, access, 0);
2128         if (IS_ERR(obj->umem))
2129                 return PTR_ERR(obj->umem);
2130
2131         mlx5_ib_cont_pages(obj->umem, obj->umem->address,
2132                            MLX5_MKEY_PAGE_SHIFT_MASK, &npages,
2133                            &obj->page_shift, &obj->ncont, NULL);
2134
2135         if (!npages) {
2136                 ib_umem_release(obj->umem);
2137                 return -EINVAL;
2138         }
2139
2140         page_mask = (1 << obj->page_shift) - 1;
2141         obj->page_offset = obj->umem->address & page_mask;
2142
2143         return 0;
2144 }
2145
2146 static int devx_umem_reg_cmd_alloc(struct uverbs_attr_bundle *attrs,
2147                                    struct devx_umem *obj,
2148                                    struct devx_umem_reg_cmd *cmd)
2149 {
2150         cmd->inlen = MLX5_ST_SZ_BYTES(create_umem_in) +
2151                     (MLX5_ST_SZ_BYTES(mtt) * obj->ncont);
2152         cmd->in = uverbs_zalloc(attrs, cmd->inlen);
2153         return PTR_ERR_OR_ZERO(cmd->in);
2154 }
2155
2156 static void devx_umem_reg_cmd_build(struct mlx5_ib_dev *dev,
2157                                     struct devx_umem *obj,
2158                                     struct devx_umem_reg_cmd *cmd)
2159 {
2160         void *umem;
2161         __be64 *mtt;
2162
2163         umem = MLX5_ADDR_OF(create_umem_in, cmd->in, umem);
2164         mtt = (__be64 *)MLX5_ADDR_OF(umem, umem, mtt);
2165
2166         MLX5_SET(create_umem_in, cmd->in, opcode, MLX5_CMD_OP_CREATE_UMEM);
2167         MLX5_SET64(umem, umem, num_of_mtt, obj->ncont);
2168         MLX5_SET(umem, umem, log_page_size, obj->page_shift -
2169                                             MLX5_ADAPTER_PAGE_SHIFT);
2170         MLX5_SET(umem, umem, page_offset, obj->page_offset);
2171         mlx5_ib_populate_pas(dev, obj->umem, obj->page_shift, mtt,
2172                              (obj->umem->writable ? MLX5_IB_MTT_WRITE : 0) |
2173                              MLX5_IB_MTT_READ);
2174 }
2175
2176 static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_UMEM_REG)(
2177         struct uverbs_attr_bundle *attrs)
2178 {
2179         struct devx_umem_reg_cmd cmd;
2180         struct devx_umem *obj;
2181         struct ib_uobject *uobj = uverbs_attr_get_uobject(
2182                 attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_HANDLE);
2183         u32 obj_id;
2184         struct mlx5_ib_ucontext *c = rdma_udata_to_drv_context(
2185                 &attrs->driver_udata, struct mlx5_ib_ucontext, ibucontext);
2186         struct mlx5_ib_dev *dev = to_mdev(c->ibucontext.device);
2187         int err;
2188
2189         if (!c->devx_uid)
2190                 return -EINVAL;
2191
2192         obj = kzalloc(sizeof(struct devx_umem), GFP_KERNEL);
2193         if (!obj)
2194                 return -ENOMEM;
2195
2196         err = devx_umem_get(dev, &c->ibucontext, attrs, obj);
2197         if (err)
2198                 goto err_obj_free;
2199
2200         err = devx_umem_reg_cmd_alloc(attrs, obj, &cmd);
2201         if (err)
2202                 goto err_umem_release;
2203
2204         devx_umem_reg_cmd_build(dev, obj, &cmd);
2205
2206         MLX5_SET(create_umem_in, cmd.in, uid, c->devx_uid);
2207         err = mlx5_cmd_exec(dev->mdev, cmd.in, cmd.inlen, cmd.out,
2208                             sizeof(cmd.out));
2209         if (err)
2210                 goto err_umem_release;
2211
2212         obj->mdev = dev->mdev;
2213         uobj->object = obj;
2214         devx_obj_build_destroy_cmd(cmd.in, cmd.out, obj->dinbox, &obj->dinlen, &obj_id);
2215         err = uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_OUT_ID, &obj_id, sizeof(obj_id));
2216         if (err)
2217                 goto err_umem_destroy;
2218
2219         return 0;
2220
2221 err_umem_destroy:
2222         mlx5_cmd_exec(obj->mdev, obj->dinbox, obj->dinlen, cmd.out, sizeof(cmd.out));
2223 err_umem_release:
2224         ib_umem_release(obj->umem);
2225 err_obj_free:
2226         kfree(obj);
2227         return err;
2228 }
2229
2230 static int devx_umem_cleanup(struct ib_uobject *uobject,
2231                              enum rdma_remove_reason why,
2232                              struct uverbs_attr_bundle *attrs)
2233 {
2234         struct devx_umem *obj = uobject->object;
2235         u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
2236         int err;
2237
2238         err = mlx5_cmd_exec(obj->mdev, obj->dinbox, obj->dinlen, out, sizeof(out));
2239         if (ib_is_destroy_retryable(err, why, uobject))
2240                 return err;
2241
2242         ib_umem_release(obj->umem);
2243         kfree(obj);
2244         return 0;
2245 }
2246
2247 static bool is_unaffiliated_event(struct mlx5_core_dev *dev,
2248                                   unsigned long event_type)
2249 {
2250         __be64 *unaff_events;
2251         int mask_entry;
2252         int mask_bit;
2253
2254         if (!MLX5_CAP_GEN(dev, event_cap))
2255                 return is_legacy_unaffiliated_event_num(event_type);
2256
2257         unaff_events = MLX5_CAP_DEV_EVENT(dev,
2258                                           user_unaffiliated_events);
2259         WARN_ON(event_type > MAX_SUPP_EVENT_NUM);
2260
2261         mask_entry = event_type / 64;
2262         mask_bit = event_type % 64;
2263
2264         if (!(be64_to_cpu(unaff_events[mask_entry]) & (1ull << mask_bit)))
2265                 return false;
2266
2267         return true;
2268 }
2269
2270 static u32 devx_get_obj_id_from_event(unsigned long event_type, void *data)
2271 {
2272         struct mlx5_eqe *eqe = data;
2273         u32 obj_id = 0;
2274
2275         switch (event_type) {
2276         case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
2277         case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
2278         case MLX5_EVENT_TYPE_PATH_MIG:
2279         case MLX5_EVENT_TYPE_COMM_EST:
2280         case MLX5_EVENT_TYPE_SQ_DRAINED:
2281         case MLX5_EVENT_TYPE_SRQ_LAST_WQE:
2282         case MLX5_EVENT_TYPE_WQ_CATAS_ERROR:
2283         case MLX5_EVENT_TYPE_PATH_MIG_FAILED:
2284         case MLX5_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
2285         case MLX5_EVENT_TYPE_WQ_ACCESS_ERROR:
2286                 obj_id = be32_to_cpu(eqe->data.qp_srq.qp_srq_n) & 0xffffff;
2287                 break;
2288         case MLX5_EVENT_TYPE_DCT_DRAINED:
2289                 obj_id = be32_to_cpu(eqe->data.dct.dctn) & 0xffffff;
2290                 break;
2291         case MLX5_EVENT_TYPE_CQ_ERROR:
2292                 obj_id = be32_to_cpu(eqe->data.cq_err.cqn) & 0xffffff;
2293                 break;
2294         default:
2295                 obj_id = MLX5_GET(affiliated_event_header, &eqe->data, obj_id);
2296                 break;
2297         }
2298
2299         return obj_id;
2300 }
2301
2302 static int deliver_event(struct devx_event_subscription *event_sub,
2303                          const void *data)
2304 {
2305         struct devx_async_event_file *ev_file;
2306         struct devx_async_event_data *event_data;
2307         unsigned long flags;
2308
2309         ev_file = event_sub->ev_file;
2310
2311         if (ev_file->omit_data) {
2312                 spin_lock_irqsave(&ev_file->lock, flags);
2313                 if (!list_empty(&event_sub->event_list)) {
2314                         spin_unlock_irqrestore(&ev_file->lock, flags);
2315                         return 0;
2316                 }
2317
2318                 list_add_tail(&event_sub->event_list, &ev_file->event_list);
2319                 spin_unlock_irqrestore(&ev_file->lock, flags);
2320                 wake_up_interruptible(&ev_file->poll_wait);
2321                 return 0;
2322         }
2323
2324         event_data = kzalloc(sizeof(*event_data) + sizeof(struct mlx5_eqe),
2325                              GFP_ATOMIC);
2326         if (!event_data) {
2327                 spin_lock_irqsave(&ev_file->lock, flags);
2328                 ev_file->is_overflow_err = 1;
2329                 spin_unlock_irqrestore(&ev_file->lock, flags);
2330                 return -ENOMEM;
2331         }
2332
2333         event_data->hdr.cookie = event_sub->cookie;
2334         memcpy(event_data->hdr.out_data, data, sizeof(struct mlx5_eqe));
2335
2336         spin_lock_irqsave(&ev_file->lock, flags);
2337         list_add_tail(&event_data->list, &ev_file->event_list);
2338         spin_unlock_irqrestore(&ev_file->lock, flags);
2339         wake_up_interruptible(&ev_file->poll_wait);
2340
2341         return 0;
2342 }
2343
2344 static void dispatch_event_fd(struct list_head *fd_list,
2345                               const void *data)
2346 {
2347         struct devx_event_subscription *item;
2348
2349         list_for_each_entry_rcu(item, fd_list, xa_list) {
2350                 if (!get_file_rcu(item->filp))
2351                         continue;
2352
2353                 if (item->eventfd) {
2354                         eventfd_signal(item->eventfd, 1);
2355                         fput(item->filp);
2356                         continue;
2357                 }
2358
2359                 deliver_event(item, data);
2360                 fput(item->filp);
2361         }
2362 }
2363
2364 static int devx_event_notifier(struct notifier_block *nb,
2365                                unsigned long event_type, void *data)
2366 {
2367         struct mlx5_devx_event_table *table;
2368         struct mlx5_ib_dev *dev;
2369         struct devx_event *event;
2370         struct devx_obj_event *obj_event;
2371         u16 obj_type = 0;
2372         bool is_unaffiliated;
2373         u32 obj_id;
2374
2375         /* Explicit filtering to kernel events which may occur frequently */
2376         if (event_type == MLX5_EVENT_TYPE_CMD ||
2377             event_type == MLX5_EVENT_TYPE_PAGE_REQUEST)
2378                 return NOTIFY_OK;
2379
2380         table = container_of(nb, struct mlx5_devx_event_table, devx_nb.nb);
2381         dev = container_of(table, struct mlx5_ib_dev, devx_event_table);
2382         is_unaffiliated = is_unaffiliated_event(dev->mdev, event_type);
2383
2384         if (!is_unaffiliated)
2385                 obj_type = get_event_obj_type(event_type, data);
2386
2387         rcu_read_lock();
2388         event = xa_load(&table->event_xa, event_type | (obj_type << 16));
2389         if (!event) {
2390                 rcu_read_unlock();
2391                 return NOTIFY_DONE;
2392         }
2393
2394         if (is_unaffiliated) {
2395                 dispatch_event_fd(&event->unaffiliated_list, data);
2396                 rcu_read_unlock();
2397                 return NOTIFY_OK;
2398         }
2399
2400         obj_id = devx_get_obj_id_from_event(event_type, data);
2401         obj_event = xa_load(&event->object_ids, obj_id);
2402         if (!obj_event) {
2403                 rcu_read_unlock();
2404                 return NOTIFY_DONE;
2405         }
2406
2407         dispatch_event_fd(&obj_event->obj_sub_list, data);
2408
2409         rcu_read_unlock();
2410         return NOTIFY_OK;
2411 }
2412
2413 void mlx5_ib_devx_init_event_table(struct mlx5_ib_dev *dev)
2414 {
2415         struct mlx5_devx_event_table *table = &dev->devx_event_table;
2416
2417         xa_init(&table->event_xa);
2418         mutex_init(&table->event_xa_lock);
2419         MLX5_NB_INIT(&table->devx_nb, devx_event_notifier, NOTIFY_ANY);
2420         mlx5_eq_notifier_register(dev->mdev, &table->devx_nb);
2421 }
2422
2423 void mlx5_ib_devx_cleanup_event_table(struct mlx5_ib_dev *dev)
2424 {
2425         struct mlx5_devx_event_table *table = &dev->devx_event_table;
2426         struct devx_event_subscription *sub, *tmp;
2427         struct devx_event *event;
2428         void *entry;
2429         unsigned long id;
2430
2431         mlx5_eq_notifier_unregister(dev->mdev, &table->devx_nb);
2432         mutex_lock(&dev->devx_event_table.event_xa_lock);
2433         xa_for_each(&table->event_xa, id, entry) {
2434                 event = entry;
2435                 list_for_each_entry_safe(sub, tmp, &event->unaffiliated_list,
2436                                          xa_list)
2437                         devx_cleanup_subscription(dev, sub);
2438                 kfree(entry);
2439         }
2440         mutex_unlock(&dev->devx_event_table.event_xa_lock);
2441         xa_destroy(&table->event_xa);
2442 }
2443
2444 static ssize_t devx_async_cmd_event_read(struct file *filp, char __user *buf,
2445                                          size_t count, loff_t *pos)
2446 {
2447         struct devx_async_cmd_event_file *comp_ev_file = filp->private_data;
2448         struct devx_async_event_queue *ev_queue = &comp_ev_file->ev_queue;
2449         struct devx_async_data *event;
2450         int ret = 0;
2451         size_t eventsz;
2452
2453         spin_lock_irq(&ev_queue->lock);
2454
2455         while (list_empty(&ev_queue->event_list)) {
2456                 spin_unlock_irq(&ev_queue->lock);
2457
2458                 if (filp->f_flags & O_NONBLOCK)
2459                         return -EAGAIN;
2460
2461                 if (wait_event_interruptible(
2462                             ev_queue->poll_wait,
2463                             (!list_empty(&ev_queue->event_list) ||
2464                              ev_queue->is_destroyed))) {
2465                         return -ERESTARTSYS;
2466                 }
2467
2468                 if (list_empty(&ev_queue->event_list) &&
2469                     ev_queue->is_destroyed)
2470                         return -EIO;
2471
2472                 spin_lock_irq(&ev_queue->lock);
2473         }
2474
2475         event = list_entry(ev_queue->event_list.next,
2476                            struct devx_async_data, list);
2477         eventsz = event->cmd_out_len +
2478                         sizeof(struct mlx5_ib_uapi_devx_async_cmd_hdr);
2479
2480         if (eventsz > count) {
2481                 spin_unlock_irq(&ev_queue->lock);
2482                 return -ENOSPC;
2483         }
2484
2485         list_del(ev_queue->event_list.next);
2486         spin_unlock_irq(&ev_queue->lock);
2487
2488         if (copy_to_user(buf, &event->hdr, eventsz))
2489                 ret = -EFAULT;
2490         else
2491                 ret = eventsz;
2492
2493         atomic_sub(event->cmd_out_len, &ev_queue->bytes_in_use);
2494         kvfree(event);
2495         return ret;
2496 }
2497
2498 static int devx_async_cmd_event_close(struct inode *inode, struct file *filp)
2499 {
2500         struct ib_uobject *uobj = filp->private_data;
2501         struct devx_async_cmd_event_file *comp_ev_file = container_of(
2502                 uobj, struct devx_async_cmd_event_file, uobj);
2503         struct devx_async_data *entry, *tmp;
2504
2505         spin_lock_irq(&comp_ev_file->ev_queue.lock);
2506         list_for_each_entry_safe(entry, tmp,
2507                                  &comp_ev_file->ev_queue.event_list, list)
2508                 kvfree(entry);
2509         spin_unlock_irq(&comp_ev_file->ev_queue.lock);
2510
2511         uverbs_close_fd(filp);
2512         return 0;
2513 }
2514
2515 static __poll_t devx_async_cmd_event_poll(struct file *filp,
2516                                               struct poll_table_struct *wait)
2517 {
2518         struct devx_async_cmd_event_file *comp_ev_file = filp->private_data;
2519         struct devx_async_event_queue *ev_queue = &comp_ev_file->ev_queue;
2520         __poll_t pollflags = 0;
2521
2522         poll_wait(filp, &ev_queue->poll_wait, wait);
2523
2524         spin_lock_irq(&ev_queue->lock);
2525         if (ev_queue->is_destroyed)
2526                 pollflags = EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2527         else if (!list_empty(&ev_queue->event_list))
2528                 pollflags = EPOLLIN | EPOLLRDNORM;
2529         spin_unlock_irq(&ev_queue->lock);
2530
2531         return pollflags;
2532 }
2533
2534 static const struct file_operations devx_async_cmd_event_fops = {
2535         .owner   = THIS_MODULE,
2536         .read    = devx_async_cmd_event_read,
2537         .poll    = devx_async_cmd_event_poll,
2538         .release = devx_async_cmd_event_close,
2539         .llseek  = no_llseek,
2540 };
2541
2542 static ssize_t devx_async_event_read(struct file *filp, char __user *buf,
2543                                      size_t count, loff_t *pos)
2544 {
2545         struct devx_async_event_file *ev_file = filp->private_data;
2546         struct devx_event_subscription *event_sub;
2547         struct devx_async_event_data *uninitialized_var(event);
2548         int ret = 0;
2549         size_t eventsz;
2550         bool omit_data;
2551         void *event_data;
2552
2553         omit_data = ev_file->omit_data;
2554
2555         spin_lock_irq(&ev_file->lock);
2556
2557         if (ev_file->is_overflow_err) {
2558                 ev_file->is_overflow_err = 0;
2559                 spin_unlock_irq(&ev_file->lock);
2560                 return -EOVERFLOW;
2561         }
2562
2563         if (ev_file->is_destroyed) {
2564                 spin_unlock_irq(&ev_file->lock);
2565                 return -EIO;
2566         }
2567
2568         while (list_empty(&ev_file->event_list)) {
2569                 spin_unlock_irq(&ev_file->lock);
2570
2571                 if (filp->f_flags & O_NONBLOCK)
2572                         return -EAGAIN;
2573
2574                 if (wait_event_interruptible(ev_file->poll_wait,
2575                             (!list_empty(&ev_file->event_list) ||
2576                              ev_file->is_destroyed))) {
2577                         return -ERESTARTSYS;
2578                 }
2579
2580                 spin_lock_irq(&ev_file->lock);
2581                 if (ev_file->is_destroyed) {
2582                         spin_unlock_irq(&ev_file->lock);
2583                         return -EIO;
2584                 }
2585         }
2586
2587         if (omit_data) {
2588                 event_sub = list_first_entry(&ev_file->event_list,
2589                                         struct devx_event_subscription,
2590                                         event_list);
2591                 eventsz = sizeof(event_sub->cookie);
2592                 event_data = &event_sub->cookie;
2593         } else {
2594                 event = list_first_entry(&ev_file->event_list,
2595                                       struct devx_async_event_data, list);
2596                 eventsz = sizeof(struct mlx5_eqe) +
2597                         sizeof(struct mlx5_ib_uapi_devx_async_event_hdr);
2598                 event_data = &event->hdr;
2599         }
2600
2601         if (eventsz > count) {
2602                 spin_unlock_irq(&ev_file->lock);
2603                 return -EINVAL;
2604         }
2605
2606         if (omit_data)
2607                 list_del_init(&event_sub->event_list);
2608         else
2609                 list_del(&event->list);
2610
2611         spin_unlock_irq(&ev_file->lock);
2612
2613         if (copy_to_user(buf, event_data, eventsz))
2614                 /* This points to an application issue, not a kernel concern */
2615                 ret = -EFAULT;
2616         else
2617                 ret = eventsz;
2618
2619         if (!omit_data)
2620                 kfree(event);
2621         return ret;
2622 }
2623
2624 static __poll_t devx_async_event_poll(struct file *filp,
2625                                       struct poll_table_struct *wait)
2626 {
2627         struct devx_async_event_file *ev_file = filp->private_data;
2628         __poll_t pollflags = 0;
2629
2630         poll_wait(filp, &ev_file->poll_wait, wait);
2631
2632         spin_lock_irq(&ev_file->lock);
2633         if (ev_file->is_destroyed)
2634                 pollflags = EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2635         else if (!list_empty(&ev_file->event_list))
2636                 pollflags = EPOLLIN | EPOLLRDNORM;
2637         spin_unlock_irq(&ev_file->lock);
2638
2639         return pollflags;
2640 }
2641
2642 static int devx_async_event_close(struct inode *inode, struct file *filp)
2643 {
2644         struct devx_async_event_file *ev_file = filp->private_data;
2645         struct devx_event_subscription *event_sub, *event_sub_tmp;
2646         struct devx_async_event_data *entry, *tmp;
2647
2648         mutex_lock(&ev_file->dev->devx_event_table.event_xa_lock);
2649         /* delete the subscriptions which are related to this FD */
2650         list_for_each_entry_safe(event_sub, event_sub_tmp,
2651                                  &ev_file->subscribed_events_list, file_list) {
2652                 devx_cleanup_subscription(ev_file->dev, event_sub);
2653                 if (event_sub->eventfd)
2654                         eventfd_ctx_put(event_sub->eventfd);
2655
2656                 list_del_rcu(&event_sub->file_list);
2657                 /* subscription may not be used by the read API any more */
2658                 kfree_rcu(event_sub, rcu);
2659         }
2660
2661         mutex_unlock(&ev_file->dev->devx_event_table.event_xa_lock);
2662
2663         /* free the pending events allocation */
2664         if (!ev_file->omit_data) {
2665                 spin_lock_irq(&ev_file->lock);
2666                 list_for_each_entry_safe(entry, tmp,
2667                                          &ev_file->event_list, list)
2668                         kfree(entry); /* read can't come any more */
2669                 spin_unlock_irq(&ev_file->lock);
2670         }
2671
2672         uverbs_close_fd(filp);
2673         put_device(&ev_file->dev->ib_dev.dev);
2674         return 0;
2675 }
2676
2677 static const struct file_operations devx_async_event_fops = {
2678         .owner   = THIS_MODULE,
2679         .read    = devx_async_event_read,
2680         .poll    = devx_async_event_poll,
2681         .release = devx_async_event_close,
2682         .llseek  = no_llseek,
2683 };
2684
2685 static int devx_hot_unplug_async_cmd_event_file(struct ib_uobject *uobj,
2686                                                    enum rdma_remove_reason why)
2687 {
2688         struct devx_async_cmd_event_file *comp_ev_file =
2689                 container_of(uobj, struct devx_async_cmd_event_file,
2690                              uobj);
2691         struct devx_async_event_queue *ev_queue = &comp_ev_file->ev_queue;
2692
2693         spin_lock_irq(&ev_queue->lock);
2694         ev_queue->is_destroyed = 1;
2695         spin_unlock_irq(&ev_queue->lock);
2696
2697         if (why == RDMA_REMOVE_DRIVER_REMOVE)
2698                 wake_up_interruptible(&ev_queue->poll_wait);
2699
2700         mlx5_cmd_cleanup_async_ctx(&comp_ev_file->async_ctx);
2701         return 0;
2702 };
2703
2704 static int devx_hot_unplug_async_event_file(struct ib_uobject *uobj,
2705                                             enum rdma_remove_reason why)
2706 {
2707         struct devx_async_event_file *ev_file =
2708                 container_of(uobj, struct devx_async_event_file,
2709                              uobj);
2710
2711         spin_lock_irq(&ev_file->lock);
2712         ev_file->is_destroyed = 1;
2713         spin_unlock_irq(&ev_file->lock);
2714
2715         wake_up_interruptible(&ev_file->poll_wait);
2716         return 0;
2717 };
2718
2719 DECLARE_UVERBS_NAMED_METHOD(
2720         MLX5_IB_METHOD_DEVX_UMEM_REG,
2721         UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_UMEM_REG_HANDLE,
2722                         MLX5_IB_OBJECT_DEVX_UMEM,
2723                         UVERBS_ACCESS_NEW,
2724                         UA_MANDATORY),
2725         UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_ADDR,
2726                            UVERBS_ATTR_TYPE(u64),
2727                            UA_MANDATORY),
2728         UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_LEN,
2729                            UVERBS_ATTR_TYPE(u64),
2730                            UA_MANDATORY),
2731         UVERBS_ATTR_FLAGS_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_ACCESS,
2732                              enum ib_access_flags),
2733         UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_DEVX_UMEM_REG_OUT_ID,
2734                             UVERBS_ATTR_TYPE(u32),
2735                             UA_MANDATORY));
2736
2737 DECLARE_UVERBS_NAMED_METHOD_DESTROY(
2738         MLX5_IB_METHOD_DEVX_UMEM_DEREG,
2739         UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_UMEM_DEREG_HANDLE,
2740                         MLX5_IB_OBJECT_DEVX_UMEM,
2741                         UVERBS_ACCESS_DESTROY,
2742                         UA_MANDATORY));
2743
2744 DECLARE_UVERBS_NAMED_METHOD(
2745         MLX5_IB_METHOD_DEVX_QUERY_EQN,
2746         UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_QUERY_EQN_USER_VEC,
2747                            UVERBS_ATTR_TYPE(u32),
2748                            UA_MANDATORY),
2749         UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_DEVX_QUERY_EQN_DEV_EQN,
2750                             UVERBS_ATTR_TYPE(u32),
2751                             UA_MANDATORY));
2752
2753 DECLARE_UVERBS_NAMED_METHOD(
2754         MLX5_IB_METHOD_DEVX_QUERY_UAR,
2755         UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_QUERY_UAR_USER_IDX,
2756                            UVERBS_ATTR_TYPE(u32),
2757                            UA_MANDATORY),
2758         UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_DEVX_QUERY_UAR_DEV_IDX,
2759                             UVERBS_ATTR_TYPE(u32),
2760                             UA_MANDATORY));
2761
2762 DECLARE_UVERBS_NAMED_METHOD(
2763         MLX5_IB_METHOD_DEVX_OTHER,
2764         UVERBS_ATTR_PTR_IN(
2765                 MLX5_IB_ATTR_DEVX_OTHER_CMD_IN,
2766                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_in_cmd_hdr)),
2767                 UA_MANDATORY,
2768                 UA_ALLOC_AND_COPY),
2769         UVERBS_ATTR_PTR_OUT(
2770                 MLX5_IB_ATTR_DEVX_OTHER_CMD_OUT,
2771                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_out_cmd_hdr)),
2772                 UA_MANDATORY));
2773
2774 DECLARE_UVERBS_NAMED_METHOD(
2775         MLX5_IB_METHOD_DEVX_OBJ_CREATE,
2776         UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_OBJ_CREATE_HANDLE,
2777                         MLX5_IB_OBJECT_DEVX_OBJ,
2778                         UVERBS_ACCESS_NEW,
2779                         UA_MANDATORY),
2780         UVERBS_ATTR_PTR_IN(
2781                 MLX5_IB_ATTR_DEVX_OBJ_CREATE_CMD_IN,
2782                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_in_cmd_hdr)),
2783                 UA_MANDATORY,
2784                 UA_ALLOC_AND_COPY),
2785         UVERBS_ATTR_PTR_OUT(
2786                 MLX5_IB_ATTR_DEVX_OBJ_CREATE_CMD_OUT,
2787                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_out_cmd_hdr)),
2788                 UA_MANDATORY));
2789
2790 DECLARE_UVERBS_NAMED_METHOD_DESTROY(
2791         MLX5_IB_METHOD_DEVX_OBJ_DESTROY,
2792         UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_OBJ_DESTROY_HANDLE,
2793                         MLX5_IB_OBJECT_DEVX_OBJ,
2794                         UVERBS_ACCESS_DESTROY,
2795                         UA_MANDATORY));
2796
2797 DECLARE_UVERBS_NAMED_METHOD(
2798         MLX5_IB_METHOD_DEVX_OBJ_MODIFY,
2799         UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_OBJ_MODIFY_HANDLE,
2800                         UVERBS_IDR_ANY_OBJECT,
2801                         UVERBS_ACCESS_WRITE,
2802                         UA_MANDATORY),
2803         UVERBS_ATTR_PTR_IN(
2804                 MLX5_IB_ATTR_DEVX_OBJ_MODIFY_CMD_IN,
2805                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_in_cmd_hdr)),
2806                 UA_MANDATORY,
2807                 UA_ALLOC_AND_COPY),
2808         UVERBS_ATTR_PTR_OUT(
2809                 MLX5_IB_ATTR_DEVX_OBJ_MODIFY_CMD_OUT,
2810                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_out_cmd_hdr)),
2811                 UA_MANDATORY));
2812
2813 DECLARE_UVERBS_NAMED_METHOD(
2814         MLX5_IB_METHOD_DEVX_OBJ_QUERY,
2815         UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_OBJ_QUERY_HANDLE,
2816                         UVERBS_IDR_ANY_OBJECT,
2817                         UVERBS_ACCESS_READ,
2818                         UA_MANDATORY),
2819         UVERBS_ATTR_PTR_IN(
2820                 MLX5_IB_ATTR_DEVX_OBJ_QUERY_CMD_IN,
2821                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_in_cmd_hdr)),
2822                 UA_MANDATORY,
2823                 UA_ALLOC_AND_COPY),
2824         UVERBS_ATTR_PTR_OUT(
2825                 MLX5_IB_ATTR_DEVX_OBJ_QUERY_CMD_OUT,
2826                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_out_cmd_hdr)),
2827                 UA_MANDATORY));
2828
2829 DECLARE_UVERBS_NAMED_METHOD(
2830         MLX5_IB_METHOD_DEVX_OBJ_ASYNC_QUERY,
2831         UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_OBJ_QUERY_HANDLE,
2832                         UVERBS_IDR_ANY_OBJECT,
2833                         UVERBS_ACCESS_READ,
2834                         UA_MANDATORY),
2835         UVERBS_ATTR_PTR_IN(
2836                 MLX5_IB_ATTR_DEVX_OBJ_QUERY_CMD_IN,
2837                 UVERBS_ATTR_MIN_SIZE(MLX5_ST_SZ_BYTES(general_obj_in_cmd_hdr)),
2838                 UA_MANDATORY,
2839                 UA_ALLOC_AND_COPY),
2840         UVERBS_ATTR_CONST_IN(MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_OUT_LEN,
2841                 u16, UA_MANDATORY),
2842         UVERBS_ATTR_FD(MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_FD,
2843                 MLX5_IB_OBJECT_DEVX_ASYNC_CMD_FD,
2844                 UVERBS_ACCESS_READ,
2845                 UA_MANDATORY),
2846         UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_OBJ_QUERY_ASYNC_WR_ID,
2847                 UVERBS_ATTR_TYPE(u64),
2848                 UA_MANDATORY));
2849
2850 DECLARE_UVERBS_NAMED_METHOD(
2851         MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT,
2852         UVERBS_ATTR_FD(MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_FD_HANDLE,
2853                 MLX5_IB_OBJECT_DEVX_ASYNC_EVENT_FD,
2854                 UVERBS_ACCESS_READ,
2855                 UA_MANDATORY),
2856         UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_OBJ_HANDLE,
2857                 MLX5_IB_OBJECT_DEVX_OBJ,
2858                 UVERBS_ACCESS_READ,
2859                 UA_OPTIONAL),
2860         UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_TYPE_NUM_LIST,
2861                 UVERBS_ATTR_MIN_SIZE(sizeof(u16)),
2862                 UA_MANDATORY,
2863                 UA_ALLOC_AND_COPY),
2864         UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_COOKIE,
2865                 UVERBS_ATTR_TYPE(u64),
2866                 UA_OPTIONAL),
2867         UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_SUBSCRIBE_EVENT_FD_NUM,
2868                 UVERBS_ATTR_TYPE(u32),
2869                 UA_OPTIONAL));
2870
2871 DECLARE_UVERBS_GLOBAL_METHODS(MLX5_IB_OBJECT_DEVX,
2872                               &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OTHER),
2873                               &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_QUERY_UAR),
2874                               &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_QUERY_EQN),
2875                               &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT));
2876
2877 DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_OBJ,
2878                             UVERBS_TYPE_ALLOC_IDR(devx_obj_cleanup),
2879                             &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_CREATE),
2880                             &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_DESTROY),
2881                             &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_MODIFY),
2882                             &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_QUERY),
2883                             &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OBJ_ASYNC_QUERY));
2884
2885 DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_UMEM,
2886                             UVERBS_TYPE_ALLOC_IDR(devx_umem_cleanup),
2887                             &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_UMEM_REG),
2888                             &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_UMEM_DEREG));
2889
2890
2891 DECLARE_UVERBS_NAMED_METHOD(
2892         MLX5_IB_METHOD_DEVX_ASYNC_CMD_FD_ALLOC,
2893         UVERBS_ATTR_FD(MLX5_IB_ATTR_DEVX_ASYNC_CMD_FD_ALLOC_HANDLE,
2894                         MLX5_IB_OBJECT_DEVX_ASYNC_CMD_FD,
2895                         UVERBS_ACCESS_NEW,
2896                         UA_MANDATORY));
2897
2898 DECLARE_UVERBS_NAMED_OBJECT(
2899         MLX5_IB_OBJECT_DEVX_ASYNC_CMD_FD,
2900         UVERBS_TYPE_ALLOC_FD(sizeof(struct devx_async_cmd_event_file),
2901                              devx_hot_unplug_async_cmd_event_file,
2902                              &devx_async_cmd_event_fops, "[devx_async_cmd]",
2903                              O_RDONLY),
2904         &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_ASYNC_CMD_FD_ALLOC));
2905
2906 DECLARE_UVERBS_NAMED_METHOD(
2907         MLX5_IB_METHOD_DEVX_ASYNC_EVENT_FD_ALLOC,
2908         UVERBS_ATTR_FD(MLX5_IB_ATTR_DEVX_ASYNC_EVENT_FD_ALLOC_HANDLE,
2909                         MLX5_IB_OBJECT_DEVX_ASYNC_EVENT_FD,
2910                         UVERBS_ACCESS_NEW,
2911                         UA_MANDATORY),
2912         UVERBS_ATTR_FLAGS_IN(MLX5_IB_ATTR_DEVX_ASYNC_EVENT_FD_ALLOC_FLAGS,
2913                         enum mlx5_ib_uapi_devx_create_event_channel_flags,
2914                         UA_MANDATORY));
2915
2916 DECLARE_UVERBS_NAMED_OBJECT(
2917         MLX5_IB_OBJECT_DEVX_ASYNC_EVENT_FD,
2918         UVERBS_TYPE_ALLOC_FD(sizeof(struct devx_async_event_file),
2919                              devx_hot_unplug_async_event_file,
2920                              &devx_async_event_fops, "[devx_async_event]",
2921                              O_RDONLY),
2922         &UVERBS_METHOD(MLX5_IB_METHOD_DEVX_ASYNC_EVENT_FD_ALLOC));
2923
2924 static bool devx_is_supported(struct ib_device *device)
2925 {
2926         struct mlx5_ib_dev *dev = to_mdev(device);
2927
2928         return MLX5_CAP_GEN(dev->mdev, log_max_uctx);
2929 }
2930
2931 const struct uapi_definition mlx5_ib_devx_defs[] = {
2932         UAPI_DEF_CHAIN_OBJ_TREE_NAMED(
2933                 MLX5_IB_OBJECT_DEVX,
2934                 UAPI_DEF_IS_OBJ_SUPPORTED(devx_is_supported)),
2935         UAPI_DEF_CHAIN_OBJ_TREE_NAMED(
2936                 MLX5_IB_OBJECT_DEVX_OBJ,
2937                 UAPI_DEF_IS_OBJ_SUPPORTED(devx_is_supported)),
2938         UAPI_DEF_CHAIN_OBJ_TREE_NAMED(
2939                 MLX5_IB_OBJECT_DEVX_UMEM,
2940                 UAPI_DEF_IS_OBJ_SUPPORTED(devx_is_supported)),
2941         UAPI_DEF_CHAIN_OBJ_TREE_NAMED(
2942                 MLX5_IB_OBJECT_DEVX_ASYNC_CMD_FD,
2943                 UAPI_DEF_IS_OBJ_SUPPORTED(devx_is_supported)),
2944         UAPI_DEF_CHAIN_OBJ_TREE_NAMED(
2945                 MLX5_IB_OBJECT_DEVX_ASYNC_EVENT_FD,
2946                 UAPI_DEF_IS_OBJ_SUPPORTED(devx_is_supported)),
2947         {},
2948 };