drivers/net/ethernet/huawei/hinic/hinic_hw_cmdq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Huawei HiNIC PCI Express Linux driver
   4  * Copyright(c) 2017 Huawei Technologies Co., Ltd
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9 #include <linux/errno.h>
  10 #include <linux/pci.h>
  11 #include <linux/device.h>
  12 #include <linux/slab.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/sizes.h>
  16 #include <linux/atomic.h>
  17 #include <linux/log2.h>
  18 #include <linux/io.h>
  19 #include <linux/completion.h>
  20 #include <linux/err.h>
  21 #include <asm/byteorder.h>
  22 #include <asm/barrier.h>
  23
  24 #include "hinic_common.h"
  25 #include "hinic_hw_if.h"
  26 #include "hinic_hw_eqs.h"
  27 #include "hinic_hw_mgmt.h"
  28 #include "hinic_hw_wqe.h"
  29 #include "hinic_hw_wq.h"
  30 #include "hinic_hw_cmdq.h"
  31 #include "hinic_hw_io.h"
  32 #include "hinic_hw_dev.h"
  33
  34 #define CMDQ_CEQE_TYPE_SHIFT                    0
  35
  36 #define CMDQ_CEQE_TYPE_MASK                     0x7
  37
  38 #define CMDQ_CEQE_GET(val, member)              \
  39                         (((val) >> CMDQ_CEQE_##member##_SHIFT) \
  40                          & CMDQ_CEQE_##member##_MASK)
  41
  42 #define CMDQ_WQE_ERRCODE_VAL_SHIFT              20
  43
  44 #define CMDQ_WQE_ERRCODE_VAL_MASK               0xF
  45
  46 #define CMDQ_WQE_ERRCODE_GET(val, member)       \
  47                         (((val) >> CMDQ_WQE_ERRCODE_##member##_SHIFT) \
  48                          & CMDQ_WQE_ERRCODE_##member##_MASK)
  49
  50 #define CMDQ_DB_PI_OFF(pi)              (((u16)LOWER_8_BITS(pi)) << 3)
  51
  52 #define CMDQ_DB_ADDR(db_base, pi)       ((db_base) + CMDQ_DB_PI_OFF(pi))
  53
  54 #define CMDQ_WQE_HEADER(wqe)            ((struct hinic_cmdq_header *)(wqe))
  55
  56 #define CMDQ_WQE_COMPLETED(ctrl_info)   \
  57                         HINIC_CMDQ_CTRL_GET(ctrl_info, HW_BUSY_BIT)
  58
  59 #define FIRST_DATA_TO_WRITE_LAST        sizeof(u64)
  60
  61 #define CMDQ_DB_OFF                     SZ_2K
  62
  63 #define CMDQ_WQEBB_SIZE                 64
  64 #define CMDQ_WQE_SIZE                   64
  65 #define CMDQ_DEPTH                      SZ_4K
  66
  67 #define CMDQ_WQ_PAGE_SIZE               SZ_4K
  68
  69 #define WQE_LCMD_SIZE                   64
  70 #define WQE_SCMD_SIZE                   64
  71
  72 #define COMPLETE_LEN                    3
  73
  74 #define CMDQ_TIMEOUT                    1000
  75
  76 #define CMDQ_PFN(addr, page_size)       ((addr) >> (ilog2(page_size)))
  77
  78 #define cmdq_to_cmdqs(cmdq)     container_of((cmdq) - (cmdq)->cmdq_type, \
  79                                              struct hinic_cmdqs, cmdq[0])
  80
  81 #define cmdqs_to_func_to_io(cmdqs)      container_of(cmdqs, \
  82                                                      struct hinic_func_to_io, \
  83                                                      cmdqs)
  84
  85 enum cmdq_wqe_type {
  86         WQE_LCMD_TYPE = 0,
  87         WQE_SCMD_TYPE = 1,
  88 };
  89
  90 enum completion_format {
  91         COMPLETE_DIRECT = 0,
  92         COMPLETE_SGE    = 1,
  93 };
  94
  95 enum data_format {
  96         DATA_SGE        = 0,
  97         DATA_DIRECT     = 1,
  98 };
  99
 100 enum bufdesc_len {
 101         BUFDESC_LCMD_LEN = 2,   /* 16 bytes - 2(8 byte unit) */
 102         BUFDESC_SCMD_LEN = 3,   /* 24 bytes - 3(8 byte unit) */
 103 };
 104
 105 enum ctrl_sect_len {
 106         CTRL_SECT_LEN        = 1, /* 4 bytes (ctrl) - 1(8 byte unit) */
 107         CTRL_DIRECT_SECT_LEN = 2, /* 12 bytes (ctrl + rsvd) - 2(8 byte unit) */
 108 };
 109
 110 enum cmdq_scmd_type {
 111         CMDQ_SET_ARM_CMD = 2,
 112 };
 113
 114 enum cmdq_cmd_type {
 115         CMDQ_CMD_SYNC_DIRECT_RESP = 0,
 116         CMDQ_CMD_SYNC_SGE_RESP    = 1,
 117 };
 118
 119 enum completion_request {
 120         NO_CEQ  = 0,
 121         CEQ_SET = 1,
 122 };
 123
 124 /**
 125  * hinic_alloc_cmdq_buf - alloc buffer for sending command
 126  * @cmdqs: the cmdqs
 127  * @cmdq_buf: the buffer returned in this struct
 128  *
 129  * Return 0 - Success, negative - Failure
 130  **/
 131 int hinic_alloc_cmdq_buf(struct hinic_cmdqs *cmdqs,
 132                          struct hinic_cmdq_buf *cmdq_buf)
 133 {
 134         struct hinic_hwif *hwif = cmdqs->hwif;
 135         struct pci_dev *pdev = hwif->pdev;
 136
 137         cmdq_buf->buf = dma_pool_alloc(cmdqs->cmdq_buf_pool, GFP_KERNEL,
 138                                        &cmdq_buf->dma_addr);
 139         if (!cmdq_buf->buf) {
 140                 dev_err(&pdev->dev, "Failed to allocate cmd from the pool\n");
 141                 return -ENOMEM;
 142         }
 143
 144         return 0;
 145 }
 146
 147 /**
 148  * hinic_free_cmdq_buf - free buffer
 149  * @cmdqs: the cmdqs
 150  * @cmdq_buf: the buffer to free that is in this struct
 151  **/
 152 void hinic_free_cmdq_buf(struct hinic_cmdqs *cmdqs,
 153                          struct hinic_cmdq_buf *cmdq_buf)
 154 {
 155         dma_pool_free(cmdqs->cmdq_buf_pool, cmdq_buf->buf, cmdq_buf->dma_addr);
 156 }
 157
 158 static unsigned int cmdq_wqe_size_from_bdlen(enum bufdesc_len len)
 159 {
 160         unsigned int wqe_size = 0;
 161
 162         switch (len) {
 163         case BUFDESC_LCMD_LEN:
 164                 wqe_size = WQE_LCMD_SIZE;
 165                 break;
 166         case BUFDESC_SCMD_LEN:
 167                 wqe_size = WQE_SCMD_SIZE;
 168                 break;
 169         }
 170
 171         return wqe_size;
 172 }
 173
 174 static void cmdq_set_sge_completion(struct hinic_cmdq_completion *completion,
 175                                     struct hinic_cmdq_buf *buf_out)
 176 {
 177         struct hinic_sge_resp *sge_resp = &completion->sge_resp;
 178
 179         hinic_set_sge(&sge_resp->sge, buf_out->dma_addr, buf_out->size);
 180 }
 181
 182 static void cmdq_prepare_wqe_ctrl(struct hinic_cmdq_wqe *wqe, int wrapped,
 183                                   enum hinic_cmd_ack_type ack_type,
 184                                   enum hinic_mod_type mod, u8 cmd, u16 prod_idx,
 185                                   enum completion_format complete_format,
 186                                   enum data_format data_format,
 187                                   enum bufdesc_len buf_len)
 188 {
 189         struct hinic_cmdq_wqe_lcmd *wqe_lcmd;
 190         struct hinic_cmdq_wqe_scmd *wqe_scmd;
 191         enum ctrl_sect_len ctrl_len;
 192         struct hinic_ctrl *ctrl;
 193         u32 saved_data;
 194
 195         if (data_format == DATA_SGE) {
 196                 wqe_lcmd = &wqe->wqe_lcmd;
 197
 198                 wqe_lcmd->status.status_info = 0;
 199                 ctrl = &wqe_lcmd->ctrl;
 200                 ctrl_len = CTRL_SECT_LEN;
 201         } else {
 202                 wqe_scmd = &wqe->direct_wqe.wqe_scmd;
 203
 204                 wqe_scmd->status.status_info = 0;
 205                 ctrl = &wqe_scmd->ctrl;
 206                 ctrl_len = CTRL_DIRECT_SECT_LEN;
 207         }
 208
 209         ctrl->ctrl_info = HINIC_CMDQ_CTRL_SET(prod_idx, PI)             |
 210                           HINIC_CMDQ_CTRL_SET(cmd, CMD)                 |
 211                           HINIC_CMDQ_CTRL_SET(mod, MOD)                 |
 212                           HINIC_CMDQ_CTRL_SET(ack_type, ACK_TYPE);
 213
 214         CMDQ_WQE_HEADER(wqe)->header_info =
 215                 HINIC_CMDQ_WQE_HEADER_SET(buf_len, BUFDESC_LEN)            |
 216                 HINIC_CMDQ_WQE_HEADER_SET(complete_format, COMPLETE_FMT)   |
 217                 HINIC_CMDQ_WQE_HEADER_SET(data_format, DATA_FMT)           |
 218                 HINIC_CMDQ_WQE_HEADER_SET(CEQ_SET, COMPLETE_REQ)           |
 219                 HINIC_CMDQ_WQE_HEADER_SET(COMPLETE_LEN, COMPLETE_SECT_LEN) |
 220                 HINIC_CMDQ_WQE_HEADER_SET(ctrl_len, CTRL_LEN)              |
 221                 HINIC_CMDQ_WQE_HEADER_SET(wrapped, TOGGLED_WRAPPED);
 222
 223         saved_data = CMDQ_WQE_HEADER(wqe)->saved_data;
 224         saved_data = HINIC_SAVED_DATA_CLEAR(saved_data, ARM);
 225
 226         if ((cmd == CMDQ_SET_ARM_CMD) && (mod == HINIC_MOD_COMM))
 227                 CMDQ_WQE_HEADER(wqe)->saved_data |=
 228                                                 HINIC_SAVED_DATA_SET(1, ARM);
 229         else
 230                 CMDQ_WQE_HEADER(wqe)->saved_data = saved_data;
 231 }
 232
 233 static void cmdq_set_lcmd_bufdesc(struct hinic_cmdq_wqe_lcmd *wqe_lcmd,
 234                                   struct hinic_cmdq_buf *buf_in)
 235 {
 236         hinic_set_sge(&wqe_lcmd->buf_desc.sge, buf_in->dma_addr, buf_in->size);
 237 }
 238
 239 static void cmdq_set_direct_wqe_data(struct hinic_cmdq_direct_wqe *wqe,
 240                                      void *buf_in, u32 in_size)
 241 {
 242         struct hinic_cmdq_wqe_scmd *wqe_scmd = &wqe->wqe_scmd;
 243
 244         wqe_scmd->buf_desc.buf_len = in_size;
 245         memcpy(wqe_scmd->buf_desc.data, buf_in, in_size);
 246 }
 247
 248 static void cmdq_set_lcmd_wqe(struct hinic_cmdq_wqe *wqe,
 249                               enum cmdq_cmd_type cmd_type,
 250                               struct hinic_cmdq_buf *buf_in,
 251                               struct hinic_cmdq_buf *buf_out, int wrapped,
 252                               enum hinic_cmd_ack_type ack_type,
 253                               enum hinic_mod_type mod, u8 cmd, u16 prod_idx)
 254 {
 255         struct hinic_cmdq_wqe_lcmd *wqe_lcmd = &wqe->wqe_lcmd;
 256         enum completion_format complete_format;
 257
 258         switch (cmd_type) {
 259         case CMDQ_CMD_SYNC_SGE_RESP:
 260                 complete_format = COMPLETE_SGE;
 261                 cmdq_set_sge_completion(&wqe_lcmd->completion, buf_out);
 262                 break;
 263         case CMDQ_CMD_SYNC_DIRECT_RESP:
 264                 complete_format = COMPLETE_DIRECT;
 265                 wqe_lcmd->completion.direct_resp = 0;
 266                 break;
 267         }
 268
 269         cmdq_prepare_wqe_ctrl(wqe, wrapped, ack_type, mod, cmd,
 270                               prod_idx, complete_format, DATA_SGE,
 271                               BUFDESC_LCMD_LEN);
 272
 273         cmdq_set_lcmd_bufdesc(wqe_lcmd, buf_in);
 274 }
 275
 276 static void cmdq_set_direct_wqe(struct hinic_cmdq_wqe *wqe,
 277                                 enum cmdq_cmd_type cmd_type,
 278                                 void *buf_in, u16 in_size,
 279                                 struct hinic_cmdq_buf *buf_out, int wrapped,
 280                                 enum hinic_cmd_ack_type ack_type,
 281                                 enum hinic_mod_type mod, u8 cmd, u16 prod_idx)
 282 {
 283         struct hinic_cmdq_direct_wqe *direct_wqe = &wqe->direct_wqe;
 284         enum completion_format complete_format;
 285         struct hinic_cmdq_wqe_scmd *wqe_scmd;
 286
 287         wqe_scmd = &direct_wqe->wqe_scmd;
 288
 289         switch (cmd_type) {
 290         case CMDQ_CMD_SYNC_SGE_RESP:
 291                 complete_format = COMPLETE_SGE;
 292                 cmdq_set_sge_completion(&wqe_scmd->completion, buf_out);
 293                 break;
 294         case CMDQ_CMD_SYNC_DIRECT_RESP:
 295                 complete_format = COMPLETE_DIRECT;
 296                 wqe_scmd->completion.direct_resp = 0;
 297                 break;
 298         }
 299
 300         cmdq_prepare_wqe_ctrl(wqe, wrapped, ack_type, mod, cmd, prod_idx,
 301                               complete_format, DATA_DIRECT, BUFDESC_SCMD_LEN);
 302
 303         cmdq_set_direct_wqe_data(direct_wqe, buf_in, in_size);
 304 }
 305
 306 static void cmdq_wqe_fill(void *dst, void *src)
 307 {
 308         memcpy(dst + FIRST_DATA_TO_WRITE_LAST, src + FIRST_DATA_TO_WRITE_LAST,
 309                CMDQ_WQE_SIZE - FIRST_DATA_TO_WRITE_LAST);
 310
 311         wmb();          /* The first 8 bytes should be written last */
 312
 313         *(u64 *)dst = *(u64 *)src;
 314 }
 315
 316 static void cmdq_fill_db(u32 *db_info,
 317                          enum hinic_cmdq_type cmdq_type, u16 prod_idx)
 318 {
 319         *db_info = HINIC_CMDQ_DB_INFO_SET(UPPER_8_BITS(prod_idx), HI_PROD_IDX) |
 320                    HINIC_CMDQ_DB_INFO_SET(HINIC_CTRL_PATH, PATH)               |
 321                    HINIC_CMDQ_DB_INFO_SET(cmdq_type, CMDQ_TYPE)                |
 322                    HINIC_CMDQ_DB_INFO_SET(HINIC_DB_CMDQ_TYPE, DB_TYPE);
 323 }
 324
 325 static void cmdq_set_db(struct hinic_cmdq *cmdq,
 326                         enum hinic_cmdq_type cmdq_type, u16 prod_idx)
 327 {
 328         u32 db_info;
 329
 330         cmdq_fill_db(&db_info, cmdq_type, prod_idx);
 331
 332         /* The data that is written to HW should be in Big Endian Format */
 333         db_info = cpu_to_be32(db_info);
 334
 335         wmb();  /* write all before the doorbell */
 336
 337         writel(db_info, CMDQ_DB_ADDR(cmdq->db_base, prod_idx));
 338 }
 339
 340 static int cmdq_sync_cmd_direct_resp(struct hinic_cmdq *cmdq,
 341                                      enum hinic_mod_type mod, u8 cmd,
 342                                      struct hinic_cmdq_buf *buf_in,
 343                                      u64 *resp)
 344 {
 345         struct hinic_cmdq_wqe *curr_cmdq_wqe, cmdq_wqe;
 346         u16 curr_prod_idx, next_prod_idx;
 347         int errcode, wrapped, num_wqebbs;
 348         struct hinic_wq *wq = cmdq->wq;
 349         struct hinic_hw_wqe *hw_wqe;
 350         struct completion done;
 351
 352         /* Keep doorbell index correct. bh - for tasklet(ceq). */
 353         spin_lock_bh(&cmdq->cmdq_lock);
 354
 355         /* WQE_SIZE = WQEBB_SIZE, we will get the wq element and not shadow*/
 356         hw_wqe = hinic_get_wqe(wq, WQE_LCMD_SIZE, &curr_prod_idx);
 357         if (IS_ERR(hw_wqe)) {
 358                 spin_unlock_bh(&cmdq->cmdq_lock);
 359                 return -EBUSY;
 360         }
 361
 362         curr_cmdq_wqe = &hw_wqe->cmdq_wqe;
 363
 364         wrapped = cmdq->wrapped;
 365
 366         num_wqebbs = ALIGN(WQE_LCMD_SIZE, wq->wqebb_size) / wq->wqebb_size;
 367         next_prod_idx = curr_prod_idx + num_wqebbs;
 368         if (next_prod_idx >= wq->q_depth) {
 369                 cmdq->wrapped = !cmdq->wrapped;
 370                 next_prod_idx -= wq->q_depth;
 371         }
 372
 373         cmdq->errcode[curr_prod_idx] = &errcode;
 374
 375         init_completion(&done);
 376         cmdq->done[curr_prod_idx] = &done;
 377
 378         cmdq_set_lcmd_wqe(&cmdq_wqe, CMDQ_CMD_SYNC_DIRECT_RESP, buf_in, NULL,
 379                           wrapped, HINIC_CMD_ACK_TYPE_CMDQ, mod, cmd,
 380                           curr_prod_idx);
 381
 382         /* The data that is written to HW should be in Big Endian Format */
 383         hinic_cpu_to_be32(&cmdq_wqe, WQE_LCMD_SIZE);
 384
 385         /* CMDQ WQE is not shadow, therefore wqe will be written to wq */
 386         cmdq_wqe_fill(curr_cmdq_wqe, &cmdq_wqe);
 387
 388         cmdq_set_db(cmdq, HINIC_CMDQ_SYNC, next_prod_idx);
 389
 390         spin_unlock_bh(&cmdq->cmdq_lock);
 391
 392         if (!wait_for_completion_timeout(&done, CMDQ_TIMEOUT)) {
 393                 spin_lock_bh(&cmdq->cmdq_lock);
 394
 395                 if (cmdq->errcode[curr_prod_idx] == &errcode)
 396                         cmdq->errcode[curr_prod_idx] = NULL;
 397
 398                 if (cmdq->done[curr_prod_idx] == &done)
 399                         cmdq->done[curr_prod_idx] = NULL;
 400
 401                 spin_unlock_bh(&cmdq->cmdq_lock);
 402
 403                 return -ETIMEDOUT;
 404         }
 405
 406         smp_rmb();      /* read error code after completion */
 407
 408         if (resp) {
 409                 struct hinic_cmdq_wqe_lcmd *wqe_lcmd = &curr_cmdq_wqe->wqe_lcmd;
 410
 411                 *resp = cpu_to_be64(wqe_lcmd->completion.direct_resp);
 412         }
 413
 414         if (errcode != 0)
 415                 return -EFAULT;
 416
 417         return 0;
 418 }
 419
 420 static int cmdq_set_arm_bit(struct hinic_cmdq *cmdq, void *buf_in,
 421                             u16 in_size)
 422 {
 423         struct hinic_cmdq_wqe *curr_cmdq_wqe, cmdq_wqe;
 424         u16 curr_prod_idx, next_prod_idx;
 425         struct hinic_wq *wq = cmdq->wq;
 426         struct hinic_hw_wqe *hw_wqe;
 427         int wrapped, num_wqebbs;
 428
 429         /* Keep doorbell index correct */
 430         spin_lock(&cmdq->cmdq_lock);
 431
 432         /* WQE_SIZE = WQEBB_SIZE, we will get the wq element and not shadow*/
 433         hw_wqe = hinic_get_wqe(wq, WQE_SCMD_SIZE, &curr_prod_idx);
 434         if (IS_ERR(hw_wqe)) {
 435                 spin_unlock(&cmdq->cmdq_lock);
 436                 return -EBUSY;
 437         }
 438
 439         curr_cmdq_wqe = &hw_wqe->cmdq_wqe;
 440
 441         wrapped = cmdq->wrapped;
 442
 443         num_wqebbs = ALIGN(WQE_SCMD_SIZE, wq->wqebb_size) / wq->wqebb_size;
 444         next_prod_idx = curr_prod_idx + num_wqebbs;
 445         if (next_prod_idx >= wq->q_depth) {
 446                 cmdq->wrapped = !cmdq->wrapped;
 447                 next_prod_idx -= wq->q_depth;
 448         }
 449
 450         cmdq_set_direct_wqe(&cmdq_wqe, CMDQ_CMD_SYNC_DIRECT_RESP, buf_in,
 451                             in_size, NULL, wrapped, HINIC_CMD_ACK_TYPE_CMDQ,
 452                             HINIC_MOD_COMM, CMDQ_SET_ARM_CMD, curr_prod_idx);
 453
 454         /* The data that is written to HW should be in Big Endian Format */
 455         hinic_cpu_to_be32(&cmdq_wqe, WQE_SCMD_SIZE);
 456
 457         /* cmdq wqe is not shadow, therefore wqe will be written to wq */
 458         cmdq_wqe_fill(curr_cmdq_wqe, &cmdq_wqe);
 459
 460         cmdq_set_db(cmdq, HINIC_CMDQ_SYNC, next_prod_idx);
 461
 462         spin_unlock(&cmdq->cmdq_lock);
 463         return 0;
 464 }
 465
 466 static int cmdq_params_valid(struct hinic_cmdq_buf *buf_in)
 467 {
 468         if (buf_in->size > HINIC_CMDQ_MAX_DATA_SIZE)
 469                 return -EINVAL;
 470
 471         return 0;
 472 }
 473
 474 /**
 475  * hinic_cmdq_direct_resp - send command with direct data as resp
 476  * @cmdqs: the cmdqs
 477  * @mod: module on the card that will handle the command
 478  * @cmd: the command
 479  * @buf_in: the buffer for the command
 480  * @resp: the response to return
 481  *
 482  * Return 0 - Success, negative - Failure
 483  **/
 484 int hinic_cmdq_direct_resp(struct hinic_cmdqs *cmdqs,
 485                            enum hinic_mod_type mod, u8 cmd,
 486                            struct hinic_cmdq_buf *buf_in, u64 *resp)
 487 {
 488         struct hinic_hwif *hwif = cmdqs->hwif;
 489         struct pci_dev *pdev = hwif->pdev;
 490         int err;
 491
 492         err = cmdq_params_valid(buf_in);
 493         if (err) {
 494                 dev_err(&pdev->dev, "Invalid CMDQ parameters\n");
 495                 return err;
 496         }
 497
 498         return cmdq_sync_cmd_direct_resp(&cmdqs->cmdq[HINIC_CMDQ_SYNC],
 499                                          mod, cmd, buf_in, resp);
 500 }
 501
 502 /**
 503  * hinic_set_arm_bit - set arm bit for enable interrupt again
 504  * @cmdqs: the cmdqs
 505  * @q_type: type of queue to set the arm bit for
 506  * @q_id: the queue number
 507  *
 508  * Return 0 - Success, negative - Failure
 509  **/
 510 int hinic_set_arm_bit(struct hinic_cmdqs *cmdqs,
 511                       enum hinic_set_arm_qtype q_type, u32 q_id)
 512 {
 513         struct hinic_cmdq *cmdq = &cmdqs->cmdq[HINIC_CMDQ_SYNC];
 514         struct hinic_hwif *hwif = cmdqs->hwif;
 515         struct pci_dev *pdev = hwif->pdev;
 516         struct hinic_cmdq_arm_bit arm_bit;
 517         int err;
 518
 519         arm_bit.q_type = q_type;
 520         arm_bit.q_id   = q_id;
 521
 522         err = cmdq_set_arm_bit(cmdq, &arm_bit, sizeof(arm_bit));
 523         if (err) {
 524                 dev_err(&pdev->dev, "Failed to set arm for qid %d\n", q_id);
 525                 return err;
 526         }
 527
 528         return 0;
 529 }
 530
 531 static void clear_wqe_complete_bit(struct hinic_cmdq *cmdq,
 532                                    struct hinic_cmdq_wqe *wqe)
 533 {
 534         u32 header_info = be32_to_cpu(CMDQ_WQE_HEADER(wqe)->header_info);
 535         unsigned int bufdesc_len, wqe_size;
 536         struct hinic_ctrl *ctrl;
 537
 538         bufdesc_len = HINIC_CMDQ_WQE_HEADER_GET(header_info, BUFDESC_LEN);
 539         wqe_size = cmdq_wqe_size_from_bdlen(bufdesc_len);
 540         if (wqe_size == WQE_LCMD_SIZE) {
 541                 struct hinic_cmdq_wqe_lcmd *wqe_lcmd = &wqe->wqe_lcmd;
 542
 543                 ctrl = &wqe_lcmd->ctrl;
 544         } else {
 545                 struct hinic_cmdq_direct_wqe *direct_wqe = &wqe->direct_wqe;
 546                 struct hinic_cmdq_wqe_scmd *wqe_scmd;
 547
 548                 wqe_scmd = &direct_wqe->wqe_scmd;
 549                 ctrl = &wqe_scmd->ctrl;
 550         }
 551
 552         /* clear HW busy bit */
 553         ctrl->ctrl_info = 0;
 554
 555         wmb();  /* verify wqe is clear */
 556 }
 557
 558 /**
 559  * cmdq_arm_ceq_handler - cmdq completion event handler for arm command
 560  * @cmdq: the cmdq of the arm command
 561  * @wqe: the wqe of the arm command
 562  *
 563  * Return 0 - Success, negative - Failure
 564  **/
 565 static int cmdq_arm_ceq_handler(struct hinic_cmdq *cmdq,
 566                                 struct hinic_cmdq_wqe *wqe)
 567 {
 568         struct hinic_cmdq_direct_wqe *direct_wqe = &wqe->direct_wqe;
 569         struct hinic_cmdq_wqe_scmd *wqe_scmd;
 570         struct hinic_ctrl *ctrl;
 571         u32 ctrl_info;
 572
 573         wqe_scmd = &direct_wqe->wqe_scmd;
 574         ctrl = &wqe_scmd->ctrl;
 575         ctrl_info = be32_to_cpu(ctrl->ctrl_info);
 576
 577         /* HW should toggle the HW BUSY BIT */
 578         if (!CMDQ_WQE_COMPLETED(ctrl_info))
 579                 return -EBUSY;
 580
 581         clear_wqe_complete_bit(cmdq, wqe);
 582
 583         hinic_put_wqe(cmdq->wq, WQE_SCMD_SIZE);
 584         return 0;
 585 }
 586
 587 static void cmdq_update_errcode(struct hinic_cmdq *cmdq, u16 prod_idx,
 588                                 int errcode)
 589 {
 590         if (cmdq->errcode[prod_idx])
 591                 *cmdq->errcode[prod_idx] = errcode;
 592 }
 593
 594 /**
 595  * cmdq_arm_ceq_handler - cmdq completion event handler for sync command
 596  * @cmdq: the cmdq of the command
 597  * @cons_idx: the consumer index to update the error code for
 598  * @errcode: the error code
 599  **/
 600 static void cmdq_sync_cmd_handler(struct hinic_cmdq *cmdq, u16 cons_idx,
 601                                   int errcode)
 602 {
 603         u16 prod_idx = cons_idx;
 604
 605         spin_lock(&cmdq->cmdq_lock);
 606         cmdq_update_errcode(cmdq, prod_idx, errcode);
 607
 608         wmb();  /* write all before update for the command request */
 609
 610         if (cmdq->done[prod_idx])
 611                 complete(cmdq->done[prod_idx]);
 612         spin_unlock(&cmdq->cmdq_lock);
 613 }
 614
 615 static int cmdq_cmd_ceq_handler(struct hinic_cmdq *cmdq, u16 ci,
 616                                 struct hinic_cmdq_wqe *cmdq_wqe)
 617 {
 618         struct hinic_cmdq_wqe_lcmd *wqe_lcmd = &cmdq_wqe->wqe_lcmd;
 619         struct hinic_status *status = &wqe_lcmd->status;
 620         struct hinic_ctrl *ctrl = &wqe_lcmd->ctrl;
 621         int errcode;
 622
 623         if (!CMDQ_WQE_COMPLETED(be32_to_cpu(ctrl->ctrl_info)))
 624                 return -EBUSY;
 625
 626         errcode = CMDQ_WQE_ERRCODE_GET(be32_to_cpu(status->status_info), VAL);
 627
 628         cmdq_sync_cmd_handler(cmdq, ci, errcode);
 629
 630         clear_wqe_complete_bit(cmdq, cmdq_wqe);
 631         hinic_put_wqe(cmdq->wq, WQE_LCMD_SIZE);
 632         return 0;
 633 }
 634
 635 /**
 636  * cmdq_ceq_handler - cmdq completion event handler
 637  * @handle: private data for the handler(cmdqs)
 638  * @ceqe_data: ceq element data
 639  **/
 640 static void cmdq_ceq_handler(void *handle, u32 ceqe_data)
 641 {
 642         enum hinic_cmdq_type cmdq_type = CMDQ_CEQE_GET(ceqe_data, TYPE);
 643         struct hinic_cmdqs *cmdqs = (struct hinic_cmdqs *)handle;
 644         struct hinic_cmdq *cmdq = &cmdqs->cmdq[cmdq_type];
 645         struct hinic_cmdq_header *header;
 646         struct hinic_hw_wqe *hw_wqe;
 647         int err, set_arm = 0;
 648         u32 saved_data;
 649         u16 ci;
 650
 651         /* Read the smallest wqe size for getting wqe size */
 652         while ((hw_wqe = hinic_read_wqe(cmdq->wq, WQE_SCMD_SIZE, &ci))) {
 653                 if (IS_ERR(hw_wqe))
 654                         break;
 655
 656                 header = CMDQ_WQE_HEADER(&hw_wqe->cmdq_wqe);
 657                 saved_data = be32_to_cpu(header->saved_data);
 658
 659                 if (HINIC_SAVED_DATA_GET(saved_data, ARM)) {
 660                         /* arm_bit was set until here */
 661                         set_arm = 0;
 662
 663                         if (cmdq_arm_ceq_handler(cmdq, &hw_wqe->cmdq_wqe))
 664                                 break;
 665                 } else {
 666                         set_arm = 1;
 667
 668                         hw_wqe = hinic_read_wqe(cmdq->wq, WQE_LCMD_SIZE, &ci);
 669                         if (IS_ERR(hw_wqe))
 670                                 break;
 671
 672                         if (cmdq_cmd_ceq_handler(cmdq, ci, &hw_wqe->cmdq_wqe))
 673                                 break;
 674                 }
 675         }
 676
 677         if (set_arm) {
 678                 struct hinic_hwif *hwif = cmdqs->hwif;
 679                 struct pci_dev *pdev = hwif->pdev;
 680
 681                 err = hinic_set_arm_bit(cmdqs, HINIC_SET_ARM_CMDQ, cmdq_type);
 682                 if (err)
 683                         dev_err(&pdev->dev, "Failed to set arm for CMDQ\n");
 684         }
 685 }
 686
 687 /**
 688  * cmdq_init_queue_ctxt - init the queue ctxt of a cmdq
 689  * @cmdq_ctxt: cmdq ctxt to initialize
 690  * @cmdq: the cmdq
 691  * @cmdq_pages: the memory of the queue
 692  **/
 693 static void cmdq_init_queue_ctxt(struct hinic_cmdq_ctxt *cmdq_ctxt,
 694                                  struct hinic_cmdq *cmdq,
 695                                  struct hinic_cmdq_pages *cmdq_pages)
 696 {
 697         struct hinic_cmdq_ctxt_info *ctxt_info = &cmdq_ctxt->ctxt_info;
 698         u64 wq_first_page_paddr, cmdq_first_block_paddr, pfn;
 699         struct hinic_cmdqs *cmdqs = cmdq_to_cmdqs(cmdq);
 700         struct hinic_wq *wq = cmdq->wq;
 701
 702         /* The data in the HW is in Big Endian Format */
 703         wq_first_page_paddr = be64_to_cpu(*wq->block_vaddr);
 704
 705         pfn = CMDQ_PFN(wq_first_page_paddr, wq->wq_page_size);
 706
 707         ctxt_info->curr_wqe_page_pfn =
 708                 HINIC_CMDQ_CTXT_PAGE_INFO_SET(pfn, CURR_WQE_PAGE_PFN)   |
 709                 HINIC_CMDQ_CTXT_PAGE_INFO_SET(HINIC_CEQ_ID_CMDQ, EQ_ID) |
 710                 HINIC_CMDQ_CTXT_PAGE_INFO_SET(1, CEQ_ARM)               |
 711                 HINIC_CMDQ_CTXT_PAGE_INFO_SET(1, CEQ_EN)                |
 712                 HINIC_CMDQ_CTXT_PAGE_INFO_SET(cmdq->wrapped, WRAPPED);
 713
 714         /* block PFN - Read Modify Write */
 715         cmdq_first_block_paddr = cmdq_pages->page_paddr;
 716
 717         pfn = CMDQ_PFN(cmdq_first_block_paddr, wq->wq_page_size);
 718
 719         ctxt_info->wq_block_pfn =
 720                 HINIC_CMDQ_CTXT_BLOCK_INFO_SET(pfn, WQ_BLOCK_PFN) |
 721                 HINIC_CMDQ_CTXT_BLOCK_INFO_SET(atomic_read(&wq->cons_idx), CI);
 722
 723         cmdq_ctxt->func_idx = HINIC_HWIF_FUNC_IDX(cmdqs->hwif);
 724         cmdq_ctxt->cmdq_type  = cmdq->cmdq_type;
 725 }
 726
 727 /**
 728  * init_cmdq - initialize cmdq
 729  * @cmdq: the cmdq
 730  * @wq: the wq attaced to the cmdq
 731  * @q_type: the cmdq type of the cmdq
 732  * @db_area: doorbell area for the cmdq
 733  *
 734  * Return 0 - Success, negative - Failure
 735  **/
 736 static int init_cmdq(struct hinic_cmdq *cmdq, struct hinic_wq *wq,
 737                      enum hinic_cmdq_type q_type, void __iomem *db_area)
 738 {
 739         int err;
 740
 741         cmdq->wq = wq;
 742         cmdq->cmdq_type = q_type;
 743         cmdq->wrapped = 1;
 744
 745         spin_lock_init(&cmdq->cmdq_lock);
 746
 747         cmdq->done = vzalloc(array_size(sizeof(*cmdq->done), wq->q_depth));
 748         if (!cmdq->done)
 749                 return -ENOMEM;
 750
 751         cmdq->errcode = vzalloc(array_size(sizeof(*cmdq->errcode),
 752                                            wq->q_depth));
 753         if (!cmdq->errcode) {
 754                 err = -ENOMEM;
 755                 goto err_errcode;
 756         }
 757
 758         cmdq->db_base = db_area + CMDQ_DB_OFF;
 759         return 0;
 760
 761 err_errcode:
 762         vfree(cmdq->done);
 763         return err;
 764 }
 765
 766 /**
 767  * free_cmdq - Free cmdq
 768  * @cmdq: the cmdq to free
 769  **/
 770 static void free_cmdq(struct hinic_cmdq *cmdq)
 771 {
 772         vfree(cmdq->errcode);
 773         vfree(cmdq->done);
 774 }
 775
 776 /**
 777  * init_cmdqs_ctxt - write the cmdq ctxt to HW after init all cmdq
 778  * @hwdev: the NIC HW device
 779  * @cmdqs: cmdqs to write the ctxts for
 780  * &db_area: db_area for all the cmdqs
 781  *
 782  * Return 0 - Success, negative - Failure
 783  **/
 784 static int init_cmdqs_ctxt(struct hinic_hwdev *hwdev,
 785                            struct hinic_cmdqs *cmdqs, void __iomem **db_area)
 786 {
 787         struct hinic_hwif *hwif = hwdev->hwif;
 788         enum hinic_cmdq_type type, cmdq_type;
 789         struct hinic_cmdq_ctxt *cmdq_ctxts;
 790         struct pci_dev *pdev = hwif->pdev;
 791         struct hinic_pfhwdev *pfhwdev;
 792         size_t cmdq_ctxts_size;
 793         int err;
 794
 795         if (!HINIC_IS_PF(hwif) && !HINIC_IS_PPF(hwif)) {
 796                 dev_err(&pdev->dev, "Unsupported PCI function type\n");
 797                 return -EINVAL;
 798         }
 799
 800         cmdq_ctxts_size = HINIC_MAX_CMDQ_TYPES * sizeof(*cmdq_ctxts);
 801         cmdq_ctxts = devm_kzalloc(&pdev->dev, cmdq_ctxts_size, GFP_KERNEL);
 802         if (!cmdq_ctxts)
 803                 return -ENOMEM;
 804
 805         pfhwdev = container_of(hwdev, struct hinic_pfhwdev, hwdev);
 806
 807         cmdq_type = HINIC_CMDQ_SYNC;
 808         for (; cmdq_type < HINIC_MAX_CMDQ_TYPES; cmdq_type++) {
 809                 err = init_cmdq(&cmdqs->cmdq[cmdq_type],
 810                                 &cmdqs->saved_wqs[cmdq_type], cmdq_type,
 811                                 db_area[cmdq_type]);
 812                 if (err) {
 813                         dev_err(&pdev->dev, "Failed to initialize cmdq\n");
 814                         goto err_init_cmdq;
 815                 }
 816
 817                 cmdq_init_queue_ctxt(&cmdq_ctxts[cmdq_type],
 818                                      &cmdqs->cmdq[cmdq_type],
 819                                      &cmdqs->cmdq_pages);
 820         }
 821
 822         /* Write the CMDQ ctxts */
 823         cmdq_type = HINIC_CMDQ_SYNC;
 824         for (; cmdq_type < HINIC_MAX_CMDQ_TYPES; cmdq_type++) {
 825                 err = hinic_msg_to_mgmt(&pfhwdev->pf_to_mgmt, HINIC_MOD_COMM,
 826                                         HINIC_COMM_CMD_CMDQ_CTXT_SET,
 827                                         &cmdq_ctxts[cmdq_type],
 828                                         sizeof(cmdq_ctxts[cmdq_type]),
 829                                         NULL, NULL, HINIC_MGMT_MSG_SYNC);
 830                 if (err) {
 831                         dev_err(&pdev->dev, "Failed to set CMDQ CTXT type = %d\n",
 832                                 cmdq_type);
 833                         goto err_write_cmdq_ctxt;
 834                 }
 835         }
 836
 837         devm_kfree(&pdev->dev, cmdq_ctxts);
 838         return 0;
 839
 840 err_write_cmdq_ctxt:
 841         cmdq_type = HINIC_MAX_CMDQ_TYPES;
 842
 843 err_init_cmdq:
 844         for (type = HINIC_CMDQ_SYNC; type < cmdq_type; type++)
 845                 free_cmdq(&cmdqs->cmdq[type]);
 846
 847         devm_kfree(&pdev->dev, cmdq_ctxts);
 848         return err;
 849 }
 850
 851 /**
 852  * hinic_init_cmdqs - init all cmdqs
 853  * @cmdqs: cmdqs to init
 854  * @hwif: HW interface for accessing cmdqs
 855  * @db_area: doorbell areas for all the cmdqs
 856  *
 857  * Return 0 - Success, negative - Failure
 858  **/
 859 int hinic_init_cmdqs(struct hinic_cmdqs *cmdqs, struct hinic_hwif *hwif,
 860                      void __iomem **db_area)
 861 {
 862         struct hinic_func_to_io *func_to_io = cmdqs_to_func_to_io(cmdqs);
 863         struct pci_dev *pdev = hwif->pdev;
 864         struct hinic_hwdev *hwdev;
 865         size_t saved_wqs_size;
 866         u16 max_wqe_size;
 867         int err;
 868
 869         cmdqs->hwif = hwif;
 870         cmdqs->cmdq_buf_pool = dma_pool_create("hinic_cmdq", &pdev->dev,
 871                                                HINIC_CMDQ_BUF_SIZE,
 872                                                HINIC_CMDQ_BUF_SIZE, 0);
 873         if (!cmdqs->cmdq_buf_pool)
 874                 return -ENOMEM;
 875
 876         saved_wqs_size = HINIC_MAX_CMDQ_TYPES * sizeof(struct hinic_wq);
 877         cmdqs->saved_wqs = devm_kzalloc(&pdev->dev, saved_wqs_size, GFP_KERNEL);
 878         if (!cmdqs->saved_wqs) {
 879                 err = -ENOMEM;
 880                 goto err_saved_wqs;
 881         }
 882
 883         max_wqe_size = WQE_LCMD_SIZE;
 884         err = hinic_wqs_cmdq_alloc(&cmdqs->cmdq_pages, cmdqs->saved_wqs, hwif,
 885                                    HINIC_MAX_CMDQ_TYPES, CMDQ_WQEBB_SIZE,
 886                                    CMDQ_WQ_PAGE_SIZE, CMDQ_DEPTH, max_wqe_size);
 887         if (err) {
 888                 dev_err(&pdev->dev, "Failed to allocate CMDQ wqs\n");
 889                 goto err_cmdq_wqs;
 890         }
 891
 892         hwdev = container_of(func_to_io, struct hinic_hwdev, func_to_io);
 893         err = init_cmdqs_ctxt(hwdev, cmdqs, db_area);
 894         if (err) {
 895                 dev_err(&pdev->dev, "Failed to write cmdq ctxt\n");
 896                 goto err_cmdq_ctxt;
 897         }
 898
 899         hinic_ceq_register_cb(&func_to_io->ceqs, HINIC_CEQ_CMDQ, cmdqs,
 900                               cmdq_ceq_handler);
 901         return 0;
 902
 903 err_cmdq_ctxt:
 904         hinic_wqs_cmdq_free(&cmdqs->cmdq_pages, cmdqs->saved_wqs,
 905                             HINIC_MAX_CMDQ_TYPES);
 906
 907 err_cmdq_wqs:
 908         devm_kfree(&pdev->dev, cmdqs->saved_wqs);
 909
 910 err_saved_wqs:
 911         dma_pool_destroy(cmdqs->cmdq_buf_pool);
 912         return err;
 913 }
 914
 915 /**
 916  * hinic_free_cmdqs - free all cmdqs
 917  * @cmdqs: cmdqs to free
 918  **/
 919 void hinic_free_cmdqs(struct hinic_cmdqs *cmdqs)
 920 {
 921         struct hinic_func_to_io *func_to_io = cmdqs_to_func_to_io(cmdqs);
 922         struct hinic_hwif *hwif = cmdqs->hwif;
 923         struct pci_dev *pdev = hwif->pdev;
 924         enum hinic_cmdq_type cmdq_type;
 925
 926         hinic_ceq_unregister_cb(&func_to_io->ceqs, HINIC_CEQ_CMDQ);
 927
 928         cmdq_type = HINIC_CMDQ_SYNC;
 929         for (; cmdq_type < HINIC_MAX_CMDQ_TYPES; cmdq_type++)
 930                 free_cmdq(&cmdqs->cmdq[cmdq_type]);
 931
 932         hinic_wqs_cmdq_free(&cmdqs->cmdq_pages, cmdqs->saved_wqs,
 933                             HINIC_MAX_CMDQ_TYPES);
 934
 935         devm_kfree(&pdev->dev, cmdqs->saved_wqs);
 936
 937         dma_pool_destroy(cmdqs->cmdq_buf_pool);
 938 }