drivers/net/ethernet/mellanox/mlx4/cmd.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
   4  * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc.  All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/sched.h>
  36 #include <linux/slab.h>
  37 #include <linux/export.h>
  38 #include <linux/pci.h>
  39 #include <linux/errno.h>
  40
  41 #include <linux/mlx4/cmd.h>
  42 #include <linux/semaphore.h>
  43
  44 #include <asm/io.h>
  45
  46 #include "mlx4.h"
  47 #include "fw.h"
  48
  49 #define CMD_POLL_TOKEN 0xffff
  50 #define INBOX_MASK      0xffffffffffffff00ULL
  51
  52 #define CMD_CHAN_VER 1
  53 #define CMD_CHAN_IF_REV 1
  54
  55 enum {
  56         /* command completed successfully: */
  57         CMD_STAT_OK             = 0x00,
  58         /* Internal error (such as a bus error) occurred while processing command: */
  59         CMD_STAT_INTERNAL_ERR   = 0x01,
  60         /* Operation/command not supported or opcode modifier not supported: */
  61         CMD_STAT_BAD_OP         = 0x02,
  62         /* Parameter not supported or parameter out of range: */
  63         CMD_STAT_BAD_PARAM      = 0x03,
  64         /* System not enabled or bad system state: */
  65         CMD_STAT_BAD_SYS_STATE  = 0x04,
  66         /* Attempt to access reserved or unallocaterd resource: */
  67         CMD_STAT_BAD_RESOURCE   = 0x05,
  68         /* Requested resource is currently executing a command, or is otherwise busy: */
  69         CMD_STAT_RESOURCE_BUSY  = 0x06,
  70         /* Required capability exceeds device limits: */
  71         CMD_STAT_EXCEED_LIM     = 0x08,
  72         /* Resource is not in the appropriate state or ownership: */
  73         CMD_STAT_BAD_RES_STATE  = 0x09,
  74         /* Index out of range: */
  75         CMD_STAT_BAD_INDEX      = 0x0a,
  76         /* FW image corrupted: */
  77         CMD_STAT_BAD_NVMEM      = 0x0b,
  78         /* Error in ICM mapping (e.g. not enough auxiliary ICM pages to execute command): */
  79         CMD_STAT_ICM_ERROR      = 0x0c,
  80         /* Attempt to modify a QP/EE which is not in the presumed state: */
  81         CMD_STAT_BAD_QP_STATE   = 0x10,
  82         /* Bad segment parameters (Address/Size): */
  83         CMD_STAT_BAD_SEG_PARAM  = 0x20,
  84         /* Memory Region has Memory Windows bound to: */
  85         CMD_STAT_REG_BOUND      = 0x21,
  86         /* HCA local attached memory not present: */
  87         CMD_STAT_LAM_NOT_PRE    = 0x22,
  88         /* Bad management packet (silently discarded): */
  89         CMD_STAT_BAD_PKT        = 0x30,
  90         /* More outstanding CQEs in CQ than new CQ size: */
  91         CMD_STAT_BAD_SIZE       = 0x40,
  92         /* Multi Function device support required: */
  93         CMD_STAT_MULTI_FUNC_REQ = 0x50,
  94 };
  95
  96 enum {
  97         HCR_IN_PARAM_OFFSET     = 0x00,
  98         HCR_IN_MODIFIER_OFFSET  = 0x08,
  99         HCR_OUT_PARAM_OFFSET    = 0x0c,
 100         HCR_TOKEN_OFFSET        = 0x14,
 101         HCR_STATUS_OFFSET       = 0x18,
 102
 103         HCR_OPMOD_SHIFT         = 12,
 104         HCR_T_BIT               = 21,
 105         HCR_E_BIT               = 22,
 106         HCR_GO_BIT              = 23
 107 };
 108
 109 enum {
 110         GO_BIT_TIMEOUT_MSECS    = 10000
 111 };
 112
 113 struct mlx4_cmd_context {
 114         struct completion       done;
 115         int                     result;
 116         int                     next;
 117         u64                     out_param;
 118         u16                     token;
 119         u8                      fw_status;
 120 };
 121
 122 static int mlx4_master_process_vhcr(struct mlx4_dev *dev, int slave,
 123                                     struct mlx4_vhcr_cmd *in_vhcr);
 124
 125 static int mlx4_status_to_errno(u8 status)
 126 {
 127         static const int trans_table[] = {
 128                 [CMD_STAT_INTERNAL_ERR]   = -EIO,
 129                 [CMD_STAT_BAD_OP]         = -EPERM,
 130                 [CMD_STAT_BAD_PARAM]      = -EINVAL,
 131                 [CMD_STAT_BAD_SYS_STATE]  = -ENXIO,
 132                 [CMD_STAT_BAD_RESOURCE]   = -EBADF,
 133                 [CMD_STAT_RESOURCE_BUSY]  = -EBUSY,
 134                 [CMD_STAT_EXCEED_LIM]     = -ENOMEM,
 135                 [CMD_STAT_BAD_RES_STATE]  = -EBADF,
 136                 [CMD_STAT_BAD_INDEX]      = -EBADF,
 137                 [CMD_STAT_BAD_NVMEM]      = -EFAULT,
 138                 [CMD_STAT_ICM_ERROR]      = -ENFILE,
 139                 [CMD_STAT_BAD_QP_STATE]   = -EINVAL,
 140                 [CMD_STAT_BAD_SEG_PARAM]  = -EFAULT,
 141                 [CMD_STAT_REG_BOUND]      = -EBUSY,
 142                 [CMD_STAT_LAM_NOT_PRE]    = -EAGAIN,
 143                 [CMD_STAT_BAD_PKT]        = -EINVAL,
 144                 [CMD_STAT_BAD_SIZE]       = -ENOMEM,
 145                 [CMD_STAT_MULTI_FUNC_REQ] = -EACCES,
 146         };
 147
 148         if (status >= ARRAY_SIZE(trans_table) ||
 149             (status != CMD_STAT_OK && trans_table[status] == 0))
 150                 return -EIO;
 151
 152         return trans_table[status];
 153 }
 154
 155 static int comm_pending(struct mlx4_dev *dev)
 156 {
 157         struct mlx4_priv *priv = mlx4_priv(dev);
 158         u32 status = readl(&priv->mfunc.comm->slave_read);
 159
 160         return (swab32(status) >> 31) != priv->cmd.comm_toggle;
 161 }
 162
 163 static void mlx4_comm_cmd_post(struct mlx4_dev *dev, u8 cmd, u16 param)
 164 {
 165         struct mlx4_priv *priv = mlx4_priv(dev);
 166         u32 val;
 167
 168         priv->cmd.comm_toggle ^= 1;
 169         val = param | (cmd << 16) | (priv->cmd.comm_toggle << 31);
 170         __raw_writel((__force u32) cpu_to_be32(val),
 171                      &priv->mfunc.comm->slave_write);
 172         mmiowb();
 173 }
 174
 175 static int mlx4_comm_cmd_poll(struct mlx4_dev *dev, u8 cmd, u16 param,
 176                        unsigned long timeout)
 177 {
 178         struct mlx4_priv *priv = mlx4_priv(dev);
 179         unsigned long end;
 180         int err = 0;
 181         int ret_from_pending = 0;
 182
 183         /* First, verify that the master reports correct status */
 184         if (comm_pending(dev)) {
 185                 mlx4_warn(dev, "Communication channel is not idle."
 186                           "my toggle is %d (cmd:0x%x)\n",
 187                           priv->cmd.comm_toggle, cmd);
 188                 return -EAGAIN;
 189         }
 190
 191         /* Write command */
 192         down(&priv->cmd.poll_sem);
 193         mlx4_comm_cmd_post(dev, cmd, param);
 194
 195         end = msecs_to_jiffies(timeout) + jiffies;
 196         while (comm_pending(dev) && time_before(jiffies, end))
 197                 cond_resched();
 198         ret_from_pending = comm_pending(dev);
 199         if (ret_from_pending) {
 200                 /* check if the slave is trying to boot in the middle of
 201                  * FLR process. The only non-zero result in the RESET command
 202                  * is MLX4_DELAY_RESET_SLAVE*/
 203                 if ((MLX4_COMM_CMD_RESET == cmd)) {
 204                         mlx4_warn(dev, "Got slave FLRed from Communication"
 205                                   " channel (ret:0x%x)\n", ret_from_pending);
 206                         err = MLX4_DELAY_RESET_SLAVE;
 207                 } else {
 208                         mlx4_warn(dev, "Communication channel timed out\n");
 209                         err = -ETIMEDOUT;
 210                 }
 211         }
 212
 213         up(&priv->cmd.poll_sem);
 214         return err;
 215 }
 216
 217 static int mlx4_comm_cmd_wait(struct mlx4_dev *dev, u8 op,
 218                               u16 param, unsigned long timeout)
 219 {
 220         struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
 221         struct mlx4_cmd_context *context;
 222         int err = 0;
 223
 224         down(&cmd->event_sem);
 225
 226         spin_lock(&cmd->context_lock);
 227         BUG_ON(cmd->free_head < 0);
 228         context = &cmd->context[cmd->free_head];
 229         context->token += cmd->token_mask + 1;
 230         cmd->free_head = context->next;
 231         spin_unlock(&cmd->context_lock);
 232
 233         init_completion(&context->done);
 234
 235         mlx4_comm_cmd_post(dev, op, param);
 236
 237         if (!wait_for_completion_timeout(&context->done,
 238                                          msecs_to_jiffies(timeout))) {
 239                 err = -EBUSY;
 240                 goto out;
 241         }
 242
 243         err = context->result;
 244         if (err && context->fw_status != CMD_STAT_MULTI_FUNC_REQ) {
 245                 mlx4_err(dev, "command 0x%x failed: fw status = 0x%x\n",
 246                          op, context->fw_status);
 247                 goto out;
 248         }
 249
 250 out:
 251         spin_lock(&cmd->context_lock);
 252         context->next = cmd->free_head;
 253         cmd->free_head = context - cmd->context;
 254         spin_unlock(&cmd->context_lock);
 255
 256         up(&cmd->event_sem);
 257         return err;
 258 }
 259
 260 static int mlx4_comm_cmd(struct mlx4_dev *dev, u8 cmd, u16 param,
 261                   unsigned long timeout)
 262 {
 263         if (mlx4_priv(dev)->cmd.use_events)
 264                 return mlx4_comm_cmd_wait(dev, cmd, param, timeout);
 265         return mlx4_comm_cmd_poll(dev, cmd, param, timeout);
 266 }
 267
 268 static int cmd_pending(struct mlx4_dev *dev)
 269 {
 270         u32 status = readl(mlx4_priv(dev)->cmd.hcr + HCR_STATUS_OFFSET);
 271
 272         return (status & swab32(1 << HCR_GO_BIT)) ||
 273                 (mlx4_priv(dev)->cmd.toggle ==
 274                  !!(status & swab32(1 << HCR_T_BIT)));
 275 }
 276
 277 static int mlx4_cmd_post(struct mlx4_dev *dev, u64 in_param, u64 out_param,
 278                          u32 in_modifier, u8 op_modifier, u16 op, u16 token,
 279                          int event)
 280 {
 281         struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
 282         u32 __iomem *hcr = cmd->hcr;
 283         int ret = -EAGAIN;
 284         unsigned long end;
 285
 286         mutex_lock(&cmd->hcr_mutex);
 287
 288         end = jiffies;
 289         if (event)
 290                 end += msecs_to_jiffies(GO_BIT_TIMEOUT_MSECS);
 291
 292         while (cmd_pending(dev)) {
 293                 if (time_after_eq(jiffies, end)) {
 294                         mlx4_err(dev, "%s:cmd_pending failed\n", __func__);
 295                         goto out;
 296                 }
 297                 cond_resched();
 298         }
 299
 300         /*
 301          * We use writel (instead of something like memcpy_toio)
 302          * because writes of less than 32 bits to the HCR don't work
 303          * (and some architectures such as ia64 implement memcpy_toio
 304          * in terms of writeb).
 305          */
 306         __raw_writel((__force u32) cpu_to_be32(in_param >> 32),           hcr + 0);
 307         __raw_writel((__force u32) cpu_to_be32(in_param & 0xfffffffful),  hcr + 1);
 308         __raw_writel((__force u32) cpu_to_be32(in_modifier),              hcr + 2);
 309         __raw_writel((__force u32) cpu_to_be32(out_param >> 32),          hcr + 3);
 310         __raw_writel((__force u32) cpu_to_be32(out_param & 0xfffffffful), hcr + 4);
 311         __raw_writel((__force u32) cpu_to_be32(token << 16),              hcr + 5);
 312
 313         /* __raw_writel may not order writes. */
 314         wmb();
 315
 316         __raw_writel((__force u32) cpu_to_be32((1 << HCR_GO_BIT)                |
 317                                                (cmd->toggle << HCR_T_BIT)       |
 318                                                (event ? (1 << HCR_E_BIT) : 0)   |
 319                                                (op_modifier << HCR_OPMOD_SHIFT) |
 320                                                op), hcr + 6);
 321
 322         /*
 323          * Make sure that our HCR writes don't get mixed in with
 324          * writes from another CPU starting a FW command.
 325          */
 326         mmiowb();
 327
 328         cmd->toggle = cmd->toggle ^ 1;
 329
 330         ret = 0;
 331
 332 out:
 333         mutex_unlock(&cmd->hcr_mutex);
 334         return ret;
 335 }
 336
 337 static int mlx4_slave_cmd(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
 338                           int out_is_imm, u32 in_modifier, u8 op_modifier,
 339                           u16 op, unsigned long timeout)
 340 {
 341         struct mlx4_priv *priv = mlx4_priv(dev);
 342         struct mlx4_vhcr_cmd *vhcr = priv->mfunc.vhcr;
 343         int ret;
 344
 345         down(&priv->cmd.slave_sem);
 346         vhcr->in_param = cpu_to_be64(in_param);
 347         vhcr->out_param = out_param ? cpu_to_be64(*out_param) : 0;
 348         vhcr->in_modifier = cpu_to_be32(in_modifier);
 349         vhcr->opcode = cpu_to_be16((((u16) op_modifier) << 12) | (op & 0xfff));
 350         vhcr->token = cpu_to_be16(CMD_POLL_TOKEN);
 351         vhcr->status = 0;
 352         vhcr->flags = !!(priv->cmd.use_events) << 6;
 353         if (mlx4_is_master(dev)) {
 354                 ret = mlx4_master_process_vhcr(dev, dev->caps.function, vhcr);
 355                 if (!ret) {
 356                         if (out_is_imm) {
 357                                 if (out_param)
 358                                         *out_param =
 359                                                 be64_to_cpu(vhcr->out_param);
 360                                 else {
 361                                         mlx4_err(dev, "response expected while"
 362                                                  "output mailbox is NULL for "
 363                                                  "command 0x%x\n", op);
 364                                         vhcr->status = -EINVAL;
 365                                 }
 366                         }
 367                         ret = vhcr->status;
 368                 }
 369         } else {
 370                 ret = mlx4_comm_cmd(dev, MLX4_COMM_CMD_VHCR_POST, 0,
 371                                     MLX4_COMM_TIME + timeout);
 372                 if (!ret) {
 373                         if (out_is_imm) {
 374                                 if (out_param)
 375                                         *out_param =
 376                                                 be64_to_cpu(vhcr->out_param);
 377                                 else {
 378                                         mlx4_err(dev, "response expected while"
 379                                                  "output mailbox is NULL for "
 380                                                  "command 0x%x\n", op);
 381                                         vhcr->status = -EINVAL;
 382                                 }
 383                         }
 384                         ret = vhcr->status;
 385                 } else
 386                         mlx4_err(dev, "failed execution of VHCR_POST command"
 387                                  "opcode 0x%x\n", op);
 388         }
 389         up(&priv->cmd.slave_sem);
 390         return ret;
 391 }
 392
 393 static int mlx4_cmd_poll(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
 394                          int out_is_imm, u32 in_modifier, u8 op_modifier,
 395                          u16 op, unsigned long timeout)
 396 {
 397         struct mlx4_priv *priv = mlx4_priv(dev);
 398         void __iomem *hcr = priv->cmd.hcr;
 399         int err = 0;
 400         unsigned long end;
 401         u32 stat;
 402
 403         down(&priv->cmd.poll_sem);
 404
 405         err = mlx4_cmd_post(dev, in_param, out_param ? *out_param : 0,
 406                             in_modifier, op_modifier, op, CMD_POLL_TOKEN, 0);
 407         if (err)
 408                 goto out;
 409
 410         end = msecs_to_jiffies(timeout) + jiffies;
 411         while (cmd_pending(dev) && time_before(jiffies, end))
 412                 cond_resched();
 413
 414         if (cmd_pending(dev)) {
 415                 err = -ETIMEDOUT;
 416                 goto out;
 417         }
 418
 419         if (out_is_imm)
 420                 *out_param =
 421                         (u64) be32_to_cpu((__force __be32)
 422                                           __raw_readl(hcr + HCR_OUT_PARAM_OFFSET)) << 32 |
 423                         (u64) be32_to_cpu((__force __be32)
 424                                           __raw_readl(hcr + HCR_OUT_PARAM_OFFSET + 4));
 425         stat = be32_to_cpu((__force __be32)
 426                            __raw_readl(hcr + HCR_STATUS_OFFSET)) >> 24;
 427         err = mlx4_status_to_errno(stat);
 428         if (err)
 429                 mlx4_err(dev, "command 0x%x failed: fw status = 0x%x\n",
 430                          op, stat);
 431
 432 out:
 433         up(&priv->cmd.poll_sem);
 434         return err;
 435 }
 436
 437 void mlx4_cmd_event(struct mlx4_dev *dev, u16 token, u8 status, u64 out_param)
 438 {
 439         struct mlx4_priv *priv = mlx4_priv(dev);
 440         struct mlx4_cmd_context *context =
 441                 &priv->cmd.context[token & priv->cmd.token_mask];
 442
 443         /* previously timed out command completing at long last */
 444         if (token != context->token)
 445                 return;
 446
 447         context->fw_status = status;
 448         context->result    = mlx4_status_to_errno(status);
 449         context->out_param = out_param;
 450
 451         complete(&context->done);
 452 }
 453
 454 static int mlx4_cmd_wait(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
 455                          int out_is_imm, u32 in_modifier, u8 op_modifier,
 456                          u16 op, unsigned long timeout)
 457 {
 458         struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
 459         struct mlx4_cmd_context *context;
 460         int err = 0;
 461
 462         down(&cmd->event_sem);
 463
 464         spin_lock(&cmd->context_lock);
 465         BUG_ON(cmd->free_head < 0);
 466         context = &cmd->context[cmd->free_head];
 467         context->token += cmd->token_mask + 1;
 468         cmd->free_head = context->next;
 469         spin_unlock(&cmd->context_lock);
 470
 471         init_completion(&context->done);
 472
 473         mlx4_cmd_post(dev, in_param, out_param ? *out_param : 0,
 474                       in_modifier, op_modifier, op, context->token, 1);
 475
 476         if (!wait_for_completion_timeout(&context->done,
 477                                          msecs_to_jiffies(timeout))) {
 478                 err = -EBUSY;
 479                 goto out;
 480         }
 481
 482         err = context->result;
 483         if (err) {
 484                 mlx4_err(dev, "command 0x%x failed: fw status = 0x%x\n",
 485                          op, context->fw_status);
 486                 goto out;
 487         }
 488
 489         if (out_is_imm)
 490                 *out_param = context->out_param;
 491
 492 out:
 493         spin_lock(&cmd->context_lock);
 494         context->next = cmd->free_head;
 495         cmd->free_head = context - cmd->context;
 496         spin_unlock(&cmd->context_lock);
 497
 498         up(&cmd->event_sem);
 499         return err;
 500 }
 501
 502 int __mlx4_cmd(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
 503                int out_is_imm, u32 in_modifier, u8 op_modifier,
 504                u16 op, unsigned long timeout, int native)
 505 {
 506         if (!mlx4_is_mfunc(dev) || (native && mlx4_is_master(dev))) {
 507                 if (mlx4_priv(dev)->cmd.use_events)
 508                         return mlx4_cmd_wait(dev, in_param, out_param,
 509                                              out_is_imm, in_modifier,
 510                                              op_modifier, op, timeout);
 511                 else
 512                         return mlx4_cmd_poll(dev, in_param, out_param,
 513                                              out_is_imm, in_modifier,
 514                                              op_modifier, op, timeout);
 515         }
 516         return mlx4_slave_cmd(dev, in_param, out_param, out_is_imm,
 517                               in_modifier, op_modifier, op, timeout);
 518 }
 519 EXPORT_SYMBOL_GPL(__mlx4_cmd);
 520
 521
 522 static int mlx4_ARM_COMM_CHANNEL(struct mlx4_dev *dev)
 523 {
 524         return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_ARM_COMM_CHANNEL,
 525                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
 526 }
 527
 528 static int mlx4_ACCESS_MEM(struct mlx4_dev *dev, u64 master_addr,
 529                            int slave, u64 slave_addr,
 530                            int size, int is_read)
 531 {
 532         u64 in_param;
 533         u64 out_param;
 534
 535         if ((slave_addr & 0xfff) | (master_addr & 0xfff) |
 536             (slave & ~0x7f) | (size & 0xff)) {
 537                 mlx4_err(dev, "Bad access mem params - slave_addr:0x%llx "
 538                               "master_addr:0x%llx slave_id:%d size:%d\n",
 539                               slave_addr, master_addr, slave, size);
 540                 return -EINVAL;
 541         }
 542
 543         if (is_read) {
 544                 in_param = (u64) slave | slave_addr;
 545                 out_param = (u64) dev->caps.function | master_addr;
 546         } else {
 547                 in_param = (u64) dev->caps.function | master_addr;
 548                 out_param = (u64) slave | slave_addr;
 549         }
 550
 551         return mlx4_cmd_imm(dev, in_param, &out_param, size, 0,
 552                             MLX4_CMD_ACCESS_MEM,
 553                             MLX4_CMD_TIME_CLASS_A, MLX4_CMD_NATIVE);
 554 }
 555
 556 int mlx4_DMA_wrapper(struct mlx4_dev *dev, int slave,
 557                      struct mlx4_vhcr *vhcr,
 558                      struct mlx4_cmd_mailbox *inbox,
 559                      struct mlx4_cmd_mailbox *outbox,
 560                      struct mlx4_cmd_info *cmd)
 561 {
 562         u64 in_param;
 563         u64 out_param;
 564         int err;
 565
 566         in_param = cmd->has_inbox ? (u64) inbox->dma : vhcr->in_param;
 567         out_param = cmd->has_outbox ? (u64) outbox->dma : vhcr->out_param;
 568         if (cmd->encode_slave_id) {
 569                 in_param &= 0xffffffffffffff00ll;
 570                 in_param |= slave;
 571         }
 572
 573         err = __mlx4_cmd(dev, in_param, &out_param, cmd->out_is_imm,
 574                          vhcr->in_modifier, vhcr->op_modifier, vhcr->op,
 575                          MLX4_CMD_TIME_CLASS_A, MLX4_CMD_NATIVE);
 576
 577         if (cmd->out_is_imm)
 578                 vhcr->out_param = out_param;
 579
 580         return err;
 581 }
 582
 583 static struct mlx4_cmd_info cmd_info[] = {
 584         {
 585                 .opcode = MLX4_CMD_QUERY_FW,
 586                 .has_inbox = false,
 587                 .has_outbox = true,
 588                 .out_is_imm = false,
 589                 .encode_slave_id = false,
 590                 .verify = NULL,
 591                 .wrapper = NULL
 592         },
 593         {
 594                 .opcode = MLX4_CMD_QUERY_HCA,
 595                 .has_inbox = false,
 596                 .has_outbox = true,
 597                 .out_is_imm = false,
 598                 .encode_slave_id = false,
 599                 .verify = NULL,
 600                 .wrapper = NULL
 601         },
 602         {
 603                 .opcode = MLX4_CMD_QUERY_DEV_CAP,
 604                 .has_inbox = false,
 605                 .has_outbox = true,
 606                 .out_is_imm = false,
 607                 .encode_slave_id = false,
 608                 .verify = NULL,
 609                 .wrapper = NULL
 610         },
 611         {
 612                 .opcode = MLX4_CMD_QUERY_FUNC_CAP,
 613                 .has_inbox = false,
 614                 .has_outbox = true,
 615                 .out_is_imm = false,
 616                 .encode_slave_id = false,
 617                 .verify = NULL,
 618                 .wrapper = mlx4_QUERY_FUNC_CAP_wrapper
 619         },
 620         {
 621                 .opcode = MLX4_CMD_QUERY_ADAPTER,
 622                 .has_inbox = false,
 623                 .has_outbox = true,
 624                 .out_is_imm = false,
 625                 .encode_slave_id = false,
 626                 .verify = NULL,
 627                 .wrapper = NULL
 628         },
 629         {
 630                 .opcode = MLX4_CMD_INIT_PORT,
 631                 .has_inbox = false,
 632                 .has_outbox = false,
 633                 .out_is_imm = false,
 634                 .encode_slave_id = false,
 635                 .verify = NULL,
 636                 .wrapper = mlx4_INIT_PORT_wrapper
 637         },
 638         {
 639                 .opcode = MLX4_CMD_CLOSE_PORT,
 640                 .has_inbox = false,
 641                 .has_outbox = false,
 642                 .out_is_imm  = false,
 643                 .encode_slave_id = false,
 644                 .verify = NULL,
 645                 .wrapper = mlx4_CLOSE_PORT_wrapper
 646         },
 647         {
 648                 .opcode = MLX4_CMD_QUERY_PORT,
 649                 .has_inbox = false,
 650                 .has_outbox = true,
 651                 .out_is_imm = false,
 652                 .encode_slave_id = false,
 653                 .verify = NULL,
 654                 .wrapper = mlx4_QUERY_PORT_wrapper
 655         },
 656         {
 657                 .opcode = MLX4_CMD_MAP_EQ,
 658                 .has_inbox = false,
 659                 .has_outbox = false,
 660                 .out_is_imm = false,
 661                 .encode_slave_id = false,
 662                 .verify = NULL,
 663                 .wrapper = mlx4_MAP_EQ_wrapper
 664         },
 665         {
 666                 .opcode = MLX4_CMD_SW2HW_EQ,
 667                 .has_inbox = true,
 668                 .has_outbox = false,
 669                 .out_is_imm = false,
 670                 .encode_slave_id = true,
 671                 .verify = NULL,
 672                 .wrapper = mlx4_SW2HW_EQ_wrapper
 673         },
 674         {
 675                 .opcode = MLX4_CMD_HW_HEALTH_CHECK,
 676                 .has_inbox = false,
 677                 .has_outbox = false,
 678                 .out_is_imm = false,
 679                 .encode_slave_id = false,
 680                 .verify = NULL,
 681                 .wrapper = NULL
 682         },
 683         {
 684                 .opcode = MLX4_CMD_NOP,
 685                 .has_inbox = false,
 686                 .has_outbox = false,
 687                 .out_is_imm = false,
 688                 .encode_slave_id = false,
 689                 .verify = NULL,
 690                 .wrapper = NULL
 691         },
 692         {
 693                 .opcode = MLX4_CMD_ALLOC_RES,
 694                 .has_inbox = false,
 695                 .has_outbox = false,
 696                 .out_is_imm = true,
 697                 .encode_slave_id = false,
 698                 .verify = NULL,
 699                 .wrapper = mlx4_ALLOC_RES_wrapper
 700         },
 701         {
 702                 .opcode = MLX4_CMD_FREE_RES,
 703                 .has_inbox = false,
 704                 .has_outbox = false,
 705                 .out_is_imm = false,
 706                 .encode_slave_id = false,
 707                 .verify = NULL,
 708                 .wrapper = mlx4_FREE_RES_wrapper
 709         },
 710         {
 711                 .opcode = MLX4_CMD_SW2HW_MPT,
 712                 .has_inbox = true,
 713                 .has_outbox = false,
 714                 .out_is_imm = false,
 715                 .encode_slave_id = true,
 716                 .verify = NULL,
 717                 .wrapper = mlx4_SW2HW_MPT_wrapper
 718         },
 719         {
 720                 .opcode = MLX4_CMD_QUERY_MPT,
 721                 .has_inbox = false,
 722                 .has_outbox = true,
 723                 .out_is_imm = false,
 724                 .encode_slave_id = false,
 725                 .verify = NULL,
 726                 .wrapper = mlx4_QUERY_MPT_wrapper
 727         },
 728         {
 729                 .opcode = MLX4_CMD_HW2SW_MPT,
 730                 .has_inbox = false,
 731                 .has_outbox = false,
 732                 .out_is_imm = false,
 733                 .encode_slave_id = false,
 734                 .verify = NULL,
 735                 .wrapper = mlx4_HW2SW_MPT_wrapper
 736         },
 737         {
 738                 .opcode = MLX4_CMD_READ_MTT,
 739                 .has_inbox = false,
 740                 .has_outbox = true,
 741                 .out_is_imm = false,
 742                 .encode_slave_id = false,
 743                 .verify = NULL,
 744                 .wrapper = NULL
 745         },
 746         {
 747                 .opcode = MLX4_CMD_WRITE_MTT,
 748                 .has_inbox = true,
 749                 .has_outbox = false,
 750                 .out_is_imm = false,
 751                 .encode_slave_id = false,
 752                 .verify = NULL,
 753                 .wrapper = mlx4_WRITE_MTT_wrapper
 754         },
 755         {
 756                 .opcode = MLX4_CMD_SYNC_TPT,
 757                 .has_inbox = true,
 758                 .has_outbox = false,
 759                 .out_is_imm = false,
 760                 .encode_slave_id = false,
 761                 .verify = NULL,
 762                 .wrapper = NULL
 763         },
 764         {
 765                 .opcode = MLX4_CMD_HW2SW_EQ,
 766                 .has_inbox = false,
 767                 .has_outbox = true,
 768                 .out_is_imm = false,
 769                 .encode_slave_id = true,
 770                 .verify = NULL,
 771                 .wrapper = mlx4_HW2SW_EQ_wrapper
 772         },
 773         {
 774                 .opcode = MLX4_CMD_QUERY_EQ,
 775                 .has_inbox = false,
 776                 .has_outbox = true,
 777                 .out_is_imm = false,
 778                 .encode_slave_id = true,
 779                 .verify = NULL,
 780                 .wrapper = mlx4_QUERY_EQ_wrapper
 781         },
 782         {
 783                 .opcode = MLX4_CMD_SW2HW_CQ,
 784                 .has_inbox = true,
 785                 .has_outbox = false,
 786                 .out_is_imm = false,
 787                 .encode_slave_id = true,
 788                 .verify = NULL,
 789                 .wrapper = mlx4_SW2HW_CQ_wrapper
 790         },
 791         {
 792                 .opcode = MLX4_CMD_HW2SW_CQ,
 793                 .has_inbox = false,
 794                 .has_outbox = false,
 795                 .out_is_imm = false,
 796                 .encode_slave_id = false,
 797                 .verify = NULL,
 798                 .wrapper = mlx4_HW2SW_CQ_wrapper
 799         },
 800         {
 801                 .opcode = MLX4_CMD_QUERY_CQ,
 802                 .has_inbox = false,
 803                 .has_outbox = true,
 804                 .out_is_imm = false,
 805                 .encode_slave_id = false,
 806                 .verify = NULL,
 807                 .wrapper = mlx4_QUERY_CQ_wrapper
 808         },
 809         {
 810                 .opcode = MLX4_CMD_MODIFY_CQ,
 811                 .has_inbox = true,
 812                 .has_outbox = false,
 813                 .out_is_imm = true,
 814                 .encode_slave_id = false,
 815                 .verify = NULL,
 816                 .wrapper = mlx4_MODIFY_CQ_wrapper
 817         },
 818         {
 819                 .opcode = MLX4_CMD_SW2HW_SRQ,
 820                 .has_inbox = true,
 821                 .has_outbox = false,
 822                 .out_is_imm = false,
 823                 .encode_slave_id = true,
 824                 .verify = NULL,
 825                 .wrapper = mlx4_SW2HW_SRQ_wrapper
 826         },
 827         {
 828                 .opcode = MLX4_CMD_HW2SW_SRQ,
 829                 .has_inbox = false,
 830                 .has_outbox = false,
 831                 .out_is_imm = false,
 832                 .encode_slave_id = false,
 833                 .verify = NULL,
 834                 .wrapper = mlx4_HW2SW_SRQ_wrapper
 835         },
 836         {
 837                 .opcode = MLX4_CMD_QUERY_SRQ,
 838                 .has_inbox = false,
 839                 .has_outbox = true,
 840                 .out_is_imm = false,
 841                 .encode_slave_id = false,
 842                 .verify = NULL,
 843                 .wrapper = mlx4_QUERY_SRQ_wrapper
 844         },
 845         {
 846                 .opcode = MLX4_CMD_ARM_SRQ,
 847                 .has_inbox = false,
 848                 .has_outbox = false,
 849                 .out_is_imm = false,
 850                 .encode_slave_id = false,
 851                 .verify = NULL,
 852                 .wrapper = mlx4_ARM_SRQ_wrapper
 853         },
 854         {
 855                 .opcode = MLX4_CMD_RST2INIT_QP,
 856                 .has_inbox = true,
 857                 .has_outbox = false,
 858                 .out_is_imm = false,
 859                 .encode_slave_id = true,
 860                 .verify = NULL,
 861                 .wrapper = mlx4_RST2INIT_QP_wrapper
 862         },
 863         {
 864                 .opcode = MLX4_CMD_INIT2INIT_QP,
 865                 .has_inbox = true,
 866                 .has_outbox = false,
 867                 .out_is_imm = false,
 868                 .encode_slave_id = false,
 869                 .verify = NULL,
 870                 .wrapper = mlx4_GEN_QP_wrapper
 871         },
 872         {
 873                 .opcode = MLX4_CMD_INIT2RTR_QP,
 874                 .has_inbox = true,
 875                 .has_outbox = false,
 876                 .out_is_imm = false,
 877                 .encode_slave_id = false,
 878                 .verify = NULL,
 879                 .wrapper = mlx4_INIT2RTR_QP_wrapper
 880         },
 881         {
 882                 .opcode = MLX4_CMD_RTR2RTS_QP,
 883                 .has_inbox = true,
 884                 .has_outbox = false,
 885                 .out_is_imm = false,
 886                 .encode_slave_id = false,
 887                 .verify = NULL,
 888                 .wrapper = mlx4_GEN_QP_wrapper
 889         },
 890         {
 891                 .opcode = MLX4_CMD_RTS2RTS_QP,
 892                 .has_inbox = true,
 893                 .has_outbox = false,
 894                 .out_is_imm = false,
 895                 .encode_slave_id = false,
 896                 .verify = NULL,
 897                 .wrapper = mlx4_GEN_QP_wrapper
 898         },
 899         {
 900                 .opcode = MLX4_CMD_SQERR2RTS_QP,
 901                 .has_inbox = true,
 902                 .has_outbox = false,
 903                 .out_is_imm = false,
 904                 .encode_slave_id = false,
 905                 .verify = NULL,
 906                 .wrapper = mlx4_GEN_QP_wrapper
 907         },
 908         {
 909                 .opcode = MLX4_CMD_2ERR_QP,
 910                 .has_inbox = false,
 911                 .has_outbox = false,
 912                 .out_is_imm = false,
 913                 .encode_slave_id = false,
 914                 .verify = NULL,
 915                 .wrapper = mlx4_GEN_QP_wrapper
 916         },
 917         {
 918                 .opcode = MLX4_CMD_RTS2SQD_QP,
 919                 .has_inbox = false,
 920                 .has_outbox = false,
 921                 .out_is_imm = false,
 922                 .encode_slave_id = false,
 923                 .verify = NULL,
 924                 .wrapper = mlx4_GEN_QP_wrapper
 925         },
 926         {
 927                 .opcode = MLX4_CMD_SQD2SQD_QP,
 928                 .has_inbox = true,
 929                 .has_outbox = false,
 930                 .out_is_imm = false,
 931                 .encode_slave_id = false,
 932                 .verify = NULL,
 933                 .wrapper = mlx4_GEN_QP_wrapper
 934         },
 935         {
 936                 .opcode = MLX4_CMD_SQD2RTS_QP,
 937                 .has_inbox = true,
 938                 .has_outbox = false,
 939                 .out_is_imm = false,
 940                 .encode_slave_id = false,
 941                 .verify = NULL,
 942                 .wrapper = mlx4_GEN_QP_wrapper
 943         },
 944         {
 945                 .opcode = MLX4_CMD_2RST_QP,
 946                 .has_inbox = false,
 947                 .has_outbox = false,
 948                 .out_is_imm = false,
 949                 .encode_slave_id = false,
 950                 .verify = NULL,
 951                 .wrapper = mlx4_2RST_QP_wrapper
 952         },
 953         {
 954                 .opcode = MLX4_CMD_QUERY_QP,
 955                 .has_inbox = false,
 956                 .has_outbox = true,
 957                 .out_is_imm = false,
 958                 .encode_slave_id = false,
 959                 .verify = NULL,
 960                 .wrapper = mlx4_GEN_QP_wrapper
 961         },
 962         {
 963                 .opcode = MLX4_CMD_SUSPEND_QP,
 964                 .has_inbox = false,
 965                 .has_outbox = false,
 966                 .out_is_imm = false,
 967                 .encode_slave_id = false,
 968                 .verify = NULL,
 969                 .wrapper = mlx4_GEN_QP_wrapper
 970         },
 971         {
 972                 .opcode = MLX4_CMD_UNSUSPEND_QP,
 973                 .has_inbox = false,
 974                 .has_outbox = false,
 975                 .out_is_imm = false,
 976                 .encode_slave_id = false,
 977                 .verify = NULL,
 978                 .wrapper = mlx4_GEN_QP_wrapper
 979         },
 980         {
 981                 .opcode = MLX4_CMD_QUERY_IF_STAT,
 982                 .has_inbox = false,
 983                 .has_outbox = true,
 984                 .out_is_imm = false,
 985                 .encode_slave_id = false,
 986                 .verify = NULL,
 987                 .wrapper = mlx4_QUERY_IF_STAT_wrapper
 988         },
 989         /* Native multicast commands are not available for guests */
 990         {
 991                 .opcode = MLX4_CMD_QP_ATTACH,
 992                 .has_inbox = true,
 993                 .has_outbox = false,
 994                 .out_is_imm = false,
 995                 .encode_slave_id = false,
 996                 .verify = NULL,
 997                 .wrapper = mlx4_QP_ATTACH_wrapper
 998         },
 999         {
1000                 .opcode = MLX4_CMD_PROMISC,
1001                 .has_inbox = false,
1002                 .has_outbox = false,
1003                 .out_is_imm = false,
1004                 .encode_slave_id = false,
1005                 .verify = NULL,
1006                 .wrapper = mlx4_PROMISC_wrapper
1007         },
1008         {
1009                 .opcode = MLX4_CMD_INFORM_FLR_DONE,
1010                 .has_inbox = false,
1011                 .has_outbox = false,
1012                 .out_is_imm = false,
1013                 .encode_slave_id = false,
1014                 .verify = NULL,
1015                 .wrapper = NULL
1016         },
1017 };
1018
1019 static int mlx4_master_process_vhcr(struct mlx4_dev *dev, int slave,
1020                                     struct mlx4_vhcr_cmd *in_vhcr)
1021 {
1022         struct mlx4_priv *priv = mlx4_priv(dev);
1023         struct mlx4_cmd_info *cmd = NULL;
1024         struct mlx4_vhcr_cmd *vhcr_cmd = in_vhcr ? in_vhcr : priv->mfunc.vhcr;
1025         struct mlx4_vhcr *vhcr;
1026         struct mlx4_cmd_mailbox *inbox = NULL;
1027         struct mlx4_cmd_mailbox *outbox = NULL;
1028         u64 in_param;
1029         u64 out_param;
1030         int ret = 0;
1031         int i;
1032
1033         /* Create sw representation of Virtual HCR */
1034         vhcr = kzalloc(sizeof(struct mlx4_vhcr), GFP_KERNEL);
1035         if (!vhcr)
1036                 return -ENOMEM;
1037
1038         /* DMA in the vHCR */
1039         if (!in_vhcr) {
1040                 ret = mlx4_ACCESS_MEM(dev, priv->mfunc.vhcr_dma, slave,
1041                                       priv->mfunc.master.slave_state[slave].vhcr_dma,
1042                                       ALIGN(sizeof(struct mlx4_vhcr_cmd),
1043                                             MLX4_ACCESS_MEM_ALIGN), 1);
1044                 if (ret) {
1045                         mlx4_err(dev, "%s:Failed reading vhcr"
1046                                  "ret: 0x%x\n", __func__, ret);
1047                         kfree(vhcr);
1048                         return ret;
1049                 }
1050         }
1051
1052         /* Fill SW VHCR fields */
1053         vhcr->in_param = be64_to_cpu(vhcr_cmd->in_param);
1054         vhcr->out_param = be64_to_cpu(vhcr_cmd->out_param);
1055         vhcr->in_modifier = be32_to_cpu(vhcr_cmd->in_modifier);
1056         vhcr->token = be16_to_cpu(vhcr_cmd->token);
1057         vhcr->op = be16_to_cpu(vhcr_cmd->opcode) & 0xfff;
1058         vhcr->op_modifier = (u8) (be16_to_cpu(vhcr_cmd->opcode) >> 12);
1059         vhcr->e_bit = vhcr_cmd->flags & (1 << 6);
1060
1061         /* Lookup command */
1062         for (i = 0; i < ARRAY_SIZE(cmd_info); ++i) {
1063                 if (vhcr->op == cmd_info[i].opcode) {
1064                         cmd = &cmd_info[i];
1065                         break;
1066                 }
1067         }
1068         if (!cmd) {
1069                 mlx4_err(dev, "Unknown command:0x%x accepted from slave:%d\n",
1070                          vhcr->op, slave);
1071                 vhcr_cmd->status = -EINVAL;
1072                 goto out_status;
1073         }
1074
1075         /* Read inbox */
1076         if (cmd->has_inbox) {
1077                 vhcr->in_param &= INBOX_MASK;
1078                 inbox = mlx4_alloc_cmd_mailbox(dev);
1079                 if (IS_ERR(inbox)) {
1080                         ret = PTR_ERR(inbox);
1081                         inbox = NULL;
1082                         goto out;
1083                 }
1084
1085                 ret = mlx4_ACCESS_MEM(dev, inbox->dma, slave,
1086                                       vhcr->in_param,
1087                                       MLX4_MAILBOX_SIZE, 1);
1088                 if (ret) {
1089                         mlx4_err(dev, "%s: Failed reading inbox (cmd:0x%x)\n",
1090                                  __func__, cmd->opcode);
1091                         goto out;
1092                 }
1093         }
1094
1095         /* Apply permission and bound checks if applicable */
1096         if (cmd->verify && cmd->verify(dev, slave, vhcr, inbox)) {
1097                 mlx4_warn(dev, "Command:0x%x from slave: %d failed protection "
1098                           "checks for resource_id:%d\n", vhcr->op, slave,
1099                           vhcr->in_modifier);
1100                 vhcr_cmd->status = -EPERM;
1101                 goto out_status;
1102         }
1103
1104         /* Allocate outbox */
1105         if (cmd->has_outbox) {
1106                 outbox = mlx4_alloc_cmd_mailbox(dev);
1107                 if (IS_ERR(outbox)) {
1108                         ret = PTR_ERR(outbox);
1109                         outbox = NULL;
1110                         goto out;
1111                 }
1112         }
1113
1114         /* Execute the command! */
1115         if (cmd->wrapper) {
1116                 vhcr_cmd->status = cmd->wrapper(dev, slave, vhcr, inbox, outbox,
1117                                            cmd);
1118                 if (cmd->out_is_imm)
1119                         vhcr_cmd->out_param = cpu_to_be64(vhcr->out_param);
1120         } else {
1121                 in_param = cmd->has_inbox ? (u64) inbox->dma :
1122                         vhcr->in_param;
1123                 out_param = cmd->has_outbox ? (u64) outbox->dma :
1124                         vhcr->out_param;
1125                 vhcr_cmd->status = __mlx4_cmd(dev, in_param, &out_param,
1126                                          cmd->out_is_imm, vhcr->in_modifier,
1127                                          vhcr->op_modifier, vhcr->op,
1128                                          MLX4_CMD_TIME_CLASS_A,
1129                                          MLX4_CMD_NATIVE);
1130
1131                 if (vhcr_cmd->status) {
1132                         mlx4_warn(dev, "vhcr command:0x%x slave:%d failed with"
1133                                   " error:%d, status %d\n",
1134                                   vhcr->op, slave, vhcr->errno,
1135                                   vhcr_cmd->status);
1136                         ret = vhcr_cmd->status;
1137                         goto out;
1138                 }
1139
1140                 if (cmd->out_is_imm) {
1141                         vhcr->out_param = out_param;
1142                         vhcr_cmd->out_param = cpu_to_be64(vhcr->out_param);
1143                 }
1144         }
1145
1146         /* Write outbox if command completed successfully */
1147         if (cmd->has_outbox && !vhcr->errno) {
1148                 ret = mlx4_ACCESS_MEM(dev, outbox->dma, slave,
1149                                       vhcr->out_param,
1150                                       MLX4_MAILBOX_SIZE, MLX4_CMD_WRAPPED);
1151                 if (ret) {
1152                         mlx4_err(dev, "%s:Failed writing outbox\n", __func__);
1153                         goto out;
1154                 }
1155         }
1156
1157 out_status:
1158         /* DMA back vhcr result */
1159         if (!in_vhcr) {
1160                 ret = mlx4_ACCESS_MEM(dev, priv->mfunc.vhcr_dma, slave,
1161                                       priv->mfunc.master.slave_state[slave].vhcr_dma,
1162                                       ALIGN(sizeof(struct mlx4_vhcr),
1163                                             MLX4_ACCESS_MEM_ALIGN),
1164                                       MLX4_CMD_WRAPPED);
1165                 if (ret)
1166                         mlx4_err(dev, "%s:Failed writing vhcr result\n",
1167                                  __func__);
1168                 else if (vhcr->e_bit &&
1169                          mlx4_GEN_EQE(dev, slave, &priv->mfunc.master.cmd_eqe))
1170                                 mlx4_warn(dev, "Failed to generate command completion "
1171                                           "eqe for slave %d\n", slave);
1172         }
1173
1174 out:
1175         kfree(vhcr);
1176         mlx4_free_cmd_mailbox(dev, inbox);
1177         mlx4_free_cmd_mailbox(dev, outbox);
1178         return ret;
1179 }
1180
1181 static void mlx4_master_do_cmd(struct mlx4_dev *dev, int slave, u8 cmd,
1182                                u16 param, u8 toggle)
1183 {
1184         struct mlx4_priv *priv = mlx4_priv(dev);
1185         struct mlx4_slave_state *slave_state = priv->mfunc.master.slave_state;
1186         u32 reply;
1187         u32 slave_status = 0;
1188         u8 is_going_down = 0;
1189
1190         slave_state[slave].comm_toggle ^= 1;
1191         reply = (u32) slave_state[slave].comm_toggle << 31;
1192         if (toggle != slave_state[slave].comm_toggle) {
1193                 mlx4_warn(dev, "Incorrect toggle %d from slave %d. *** MASTER"
1194                           "STATE COMPROMISIED ***\n", toggle, slave);
1195                 goto reset_slave;
1196         }
1197         if (cmd == MLX4_COMM_CMD_RESET) {
1198                 mlx4_warn(dev, "Received reset from slave:%d\n", slave);
1199                 slave_state[slave].active = false;
1200                 /*check if we are in the middle of FLR process,
1201                 if so return "retry" status to the slave*/
1202                 if (MLX4_COMM_CMD_FLR == slave_state[slave].last_cmd) {
1203                         slave_status = MLX4_DELAY_RESET_SLAVE;
1204                         goto inform_slave_state;
1205                 }
1206
1207                 /* write the version in the event field */
1208                 reply |= mlx4_comm_get_version();
1209
1210                 goto reset_slave;
1211         }
1212         /*command from slave in the middle of FLR*/
1213         if (cmd != MLX4_COMM_CMD_RESET &&
1214             MLX4_COMM_CMD_FLR == slave_state[slave].last_cmd) {
1215                 mlx4_warn(dev, "slave:%d is Trying to run cmd(0x%x) "
1216                           "in the middle of FLR\n", slave, cmd);
1217                 return;
1218         }
1219
1220         switch (cmd) {
1221         case MLX4_COMM_CMD_VHCR0:
1222                 if (slave_state[slave].last_cmd != MLX4_COMM_CMD_RESET)
1223                         goto reset_slave;
1224                 slave_state[slave].vhcr_dma = ((u64) param) << 48;
1225                 priv->mfunc.master.slave_state[slave].cookie = 0;
1226                 mutex_init(&priv->mfunc.master.gen_eqe_mutex[slave]);
1227                 break;
1228         case MLX4_COMM_CMD_VHCR1:
1229                 if (slave_state[slave].last_cmd != MLX4_COMM_CMD_VHCR0)
1230                         goto reset_slave;
1231                 slave_state[slave].vhcr_dma |= ((u64) param) << 32;
1232                 break;
1233         case MLX4_COMM_CMD_VHCR2:
1234                 if (slave_state[slave].last_cmd != MLX4_COMM_CMD_VHCR1)
1235                         goto reset_slave;
1236                 slave_state[slave].vhcr_dma |= ((u64) param) << 16;
1237                 break;
1238         case MLX4_COMM_CMD_VHCR_EN:
1239                 if (slave_state[slave].last_cmd != MLX4_COMM_CMD_VHCR2)
1240                         goto reset_slave;
1241                 slave_state[slave].vhcr_dma |= param;
1242                 slave_state[slave].active = true;
1243                 break;
1244         case MLX4_COMM_CMD_VHCR_POST:
1245                 if ((slave_state[slave].last_cmd != MLX4_COMM_CMD_VHCR_EN) &&
1246                     (slave_state[slave].last_cmd != MLX4_COMM_CMD_VHCR_POST))
1247                         goto reset_slave;
1248                 down(&priv->cmd.slave_sem);
1249                 if (mlx4_master_process_vhcr(dev, slave, NULL)) {
1250                         mlx4_err(dev, "Failed processing vhcr for slave:%d,"
1251                                  " reseting slave.\n", slave);
1252                         up(&priv->cmd.slave_sem);
1253                         goto reset_slave;
1254                 }
1255                 up(&priv->cmd.slave_sem);
1256                 break;
1257         default:
1258                 mlx4_warn(dev, "Bad comm cmd:%d from slave:%d\n", cmd, slave);
1259                 goto reset_slave;
1260         }
1261         spin_lock(&priv->mfunc.master.slave_state_lock);
1262         if (!slave_state[slave].is_slave_going_down)
1263                 slave_state[slave].last_cmd = cmd;
1264         else
1265                 is_going_down = 1;
1266         spin_unlock(&priv->mfunc.master.slave_state_lock);
1267         if (is_going_down) {
1268                 mlx4_warn(dev, "Slave is going down aborting command(%d)"
1269                           " executing from slave:%d\n",
1270                           cmd, slave);
1271                 return;
1272         }
1273         __raw_writel((__force u32) cpu_to_be32(reply),
1274                      &priv->mfunc.comm[slave].slave_read);
1275         mmiowb();
1276
1277         return;
1278
1279 reset_slave:
1280         /* cleanup any slave resources */
1281         mlx4_delete_all_resources_for_slave(dev, slave);
1282         spin_lock(&priv->mfunc.master.slave_state_lock);
1283         if (!slave_state[slave].is_slave_going_down)
1284                 slave_state[slave].last_cmd = MLX4_COMM_CMD_RESET;
1285         spin_unlock(&priv->mfunc.master.slave_state_lock);
1286         /*with slave in the middle of flr, no need to clean resources again.*/
1287 inform_slave_state:
1288         memset(&slave_state[slave].event_eq, 0,
1289                sizeof(struct mlx4_slave_event_eq_info));
1290         __raw_writel((__force u32) cpu_to_be32(reply),
1291                      &priv->mfunc.comm[slave].slave_read);
1292         wmb();
1293 }
1294
1295 /* master command processing */
1296 void mlx4_master_comm_channel(struct work_struct *work)
1297 {
1298         struct mlx4_mfunc_master_ctx *master =
1299                 container_of(work,
1300                              struct mlx4_mfunc_master_ctx,
1301                              comm_work);
1302         struct mlx4_mfunc *mfunc =
1303                 container_of(master, struct mlx4_mfunc, master);
1304         struct mlx4_priv *priv =
1305                 container_of(mfunc, struct mlx4_priv, mfunc);
1306         struct mlx4_dev *dev = &priv->dev;
1307         __be32 *bit_vec;
1308         u32 comm_cmd;
1309         u32 vec;
1310         int i, j, slave;
1311         int toggle;
1312         int served = 0;
1313         int reported = 0;
1314         u32 slt;
1315
1316         bit_vec = master->comm_arm_bit_vector;
1317         for (i = 0; i < COMM_CHANNEL_BIT_ARRAY_SIZE; i++) {
1318                 vec = be32_to_cpu(bit_vec[i]);
1319                 for (j = 0; j < 32; j++) {
1320                         if (!(vec & (1 << j)))
1321                                 continue;
1322                         ++reported;
1323                         slave = (i * 32) + j;
1324                         comm_cmd = swab32(readl(
1325                                           &mfunc->comm[slave].slave_write));
1326                         slt = swab32(readl(&mfunc->comm[slave].slave_read))
1327                                      >> 31;
1328                         toggle = comm_cmd >> 31;
1329                         if (toggle != slt) {
1330                                 if (master->slave_state[slave].comm_toggle
1331                                     != slt) {
1332                                         printk(KERN_INFO "slave %d out of sync."
1333                                                " read toggle %d, state toggle %d. "
1334                                                "Resynching.\n", slave, slt,
1335                                                master->slave_state[slave].comm_toggle);
1336                                         master->slave_state[slave].comm_toggle =
1337                                                 slt;
1338                                 }
1339                                 mlx4_master_do_cmd(dev, slave,
1340                                                    comm_cmd >> 16 & 0xff,
1341                                                    comm_cmd & 0xffff, toggle);
1342                                 ++served;
1343                         }
1344                 }
1345         }
1346
1347         if (reported && reported != served)
1348                 mlx4_warn(dev, "Got command event with bitmask from %d slaves"
1349                           " but %d were served\n",
1350                           reported, served);
1351
1352         if (mlx4_ARM_COMM_CHANNEL(dev))
1353                 mlx4_warn(dev, "Failed to arm comm channel events\n");
1354 }
1355
1356 int mlx4_cmd_init(struct mlx4_dev *dev)
1357 {
1358         struct mlx4_priv *priv = mlx4_priv(dev);
1359
1360         mutex_init(&priv->cmd.hcr_mutex);
1361         sema_init(&priv->cmd.poll_sem, 1);
1362         priv->cmd.use_events = 0;
1363         priv->cmd.toggle     = 1;
1364
1365         priv->cmd.hcr = NULL;
1366         priv->mfunc.vhcr = NULL;
1367
1368         if (!mlx4_is_slave(dev)) {
1369                 priv->cmd.hcr = ioremap(pci_resource_start(dev->pdev, 0) +
1370                                         MLX4_HCR_BASE, MLX4_HCR_SIZE);
1371                 if (!priv->cmd.hcr) {
1372                         mlx4_err(dev, "Couldn't map command register.\n");
1373                         return -ENOMEM;
1374                 }
1375         }
1376
1377         priv->cmd.pool = pci_pool_create("mlx4_cmd", dev->pdev,
1378                                          MLX4_MAILBOX_SIZE,
1379                                          MLX4_MAILBOX_SIZE, 0);
1380         if (!priv->cmd.pool)
1381                 goto err_hcr;
1382
1383         return 0;
1384
1385 err_hcr:
1386         if (!mlx4_is_slave(dev))
1387                 iounmap(priv->cmd.hcr);
1388         return -ENOMEM;
1389 }
1390
1391 void mlx4_cmd_cleanup(struct mlx4_dev *dev)
1392 {
1393         struct mlx4_priv *priv = mlx4_priv(dev);
1394
1395         pci_pool_destroy(priv->cmd.pool);
1396
1397         if (!mlx4_is_slave(dev))
1398                 iounmap(priv->cmd.hcr);
1399 }
1400
1401 /*
1402  * Switch to using events to issue FW commands (can only be called
1403  * after event queue for command events has been initialized).
1404  */
1405 int mlx4_cmd_use_events(struct mlx4_dev *dev)
1406 {
1407         struct mlx4_priv *priv = mlx4_priv(dev);
1408         int i;
1409         int err = 0;
1410
1411         priv->cmd.context = kmalloc(priv->cmd.max_cmds *
1412                                    sizeof (struct mlx4_cmd_context),
1413                                    GFP_KERNEL);
1414         if (!priv->cmd.context)
1415                 return -ENOMEM;
1416
1417         for (i = 0; i < priv->cmd.max_cmds; ++i) {
1418                 priv->cmd.context[i].token = i;
1419                 priv->cmd.context[i].next  = i + 1;
1420         }
1421
1422         priv->cmd.context[priv->cmd.max_cmds - 1].next = -1;
1423         priv->cmd.free_head = 0;
1424
1425         sema_init(&priv->cmd.event_sem, priv->cmd.max_cmds);
1426         spin_lock_init(&priv->cmd.context_lock);
1427
1428         for (priv->cmd.token_mask = 1;
1429              priv->cmd.token_mask < priv->cmd.max_cmds;
1430              priv->cmd.token_mask <<= 1)
1431                 ; /* nothing */
1432         --priv->cmd.token_mask;
1433
1434         down(&priv->cmd.poll_sem);
1435         priv->cmd.use_events = 1;
1436
1437         return err;
1438 }
1439
1440 /*
1441  * Switch back to polling (used when shutting down the device)
1442  */
1443 void mlx4_cmd_use_polling(struct mlx4_dev *dev)
1444 {
1445         struct mlx4_priv *priv = mlx4_priv(dev);
1446         int i;
1447
1448         priv->cmd.use_events = 0;
1449
1450         for (i = 0; i < priv->cmd.max_cmds; ++i)
1451                 down(&priv->cmd.event_sem);
1452
1453         kfree(priv->cmd.context);
1454
1455         up(&priv->cmd.poll_sem);
1456 }
1457
1458 struct mlx4_cmd_mailbox *mlx4_alloc_cmd_mailbox(struct mlx4_dev *dev)
1459 {
1460         struct mlx4_cmd_mailbox *mailbox;
1461
1462         mailbox = kmalloc(sizeof *mailbox, GFP_KERNEL);
1463         if (!mailbox)
1464                 return ERR_PTR(-ENOMEM);
1465
1466         mailbox->buf = pci_pool_alloc(mlx4_priv(dev)->cmd.pool, GFP_KERNEL,
1467                                       &mailbox->dma);
1468         if (!mailbox->buf) {
1469                 kfree(mailbox);
1470                 return ERR_PTR(-ENOMEM);
1471         }
1472
1473         return mailbox;
1474 }
1475 EXPORT_SYMBOL_GPL(mlx4_alloc_cmd_mailbox);
1476
1477 void mlx4_free_cmd_mailbox(struct mlx4_dev *dev,
1478                            struct mlx4_cmd_mailbox *mailbox)
1479 {
1480         if (!mailbox)
1481                 return;
1482
1483         pci_pool_free(mlx4_priv(dev)->cmd.pool, mailbox->buf, mailbox->dma);
1484         kfree(mailbox);
1485 }
1486 EXPORT_SYMBOL_GPL(mlx4_free_cmd_mailbox);
1487
1488 u32 mlx4_comm_get_version(void)
1489 {
1490          return ((u32) CMD_CHAN_IF_REV << 8) | (u32) CMD_CHAN_VER;
1491 }