drivers/infiniband/hw/cxgb4/device.c

   1 /*
   2  * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/debugfs.h>
  35
  36 #include <rdma/ib_verbs.h>
  37
  38 #include "iw_cxgb4.h"
  39
  40 #define DRV_VERSION "0.1"
  41
  42 MODULE_AUTHOR("Steve Wise");
  43 MODULE_DESCRIPTION("Chelsio T4 RDMA Driver");
  44 MODULE_LICENSE("Dual BSD/GPL");
  45 MODULE_VERSION(DRV_VERSION);
  46
  47 static LIST_HEAD(uld_ctx_list);
  48 static DEFINE_MUTEX(dev_mutex);
  49
  50 static struct dentry *c4iw_debugfs_root;
  51
  52 struct c4iw_debugfs_data {
  53         struct c4iw_dev *devp;
  54         char *buf;
  55         int bufsize;
  56         int pos;
  57 };
  58
  59 static int count_idrs(int id, void *p, void *data)
  60 {
  61         int *countp = data;
  62
  63         *countp = *countp + 1;
  64         return 0;
  65 }
  66
  67 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
  68                             loff_t *ppos)
  69 {
  70         struct c4iw_debugfs_data *d = file->private_data;
  71
  72         return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
  73 }
  74
  75 static int dump_qp(int id, void *p, void *data)
  76 {
  77         struct c4iw_qp *qp = p;
  78         struct c4iw_debugfs_data *qpd = data;
  79         int space;
  80         int cc;
  81
  82         if (id != qp->wq.sq.qid)
  83                 return 0;
  84
  85         space = qpd->bufsize - qpd->pos - 1;
  86         if (space == 0)
  87                 return 1;
  88
  89         if (qp->ep)
  90                 cc = snprintf(qpd->buf + qpd->pos, space,
  91                              "qp sq id %u rq id %u state %u onchip %u "
  92                              "ep tid %u state %u %pI4:%u->%pI4:%u\n",
  93                              qp->wq.sq.qid, qp->wq.rq.qid, (int)qp->attr.state,
  94                              qp->wq.sq.flags & T4_SQ_ONCHIP,
  95                              qp->ep->hwtid, (int)qp->ep->com.state,
  96                              &qp->ep->com.local_addr.sin_addr.s_addr,
  97                              ntohs(qp->ep->com.local_addr.sin_port),
  98                              &qp->ep->com.remote_addr.sin_addr.s_addr,
  99                              ntohs(qp->ep->com.remote_addr.sin_port));
 100         else
 101                 cc = snprintf(qpd->buf + qpd->pos, space,
 102                              "qp sq id %u rq id %u state %u onchip %u\n",
 103                               qp->wq.sq.qid, qp->wq.rq.qid,
 104                               (int)qp->attr.state,
 105                               qp->wq.sq.flags & T4_SQ_ONCHIP);
 106         if (cc < space)
 107                 qpd->pos += cc;
 108         return 0;
 109 }
 110
 111 static int qp_release(struct inode *inode, struct file *file)
 112 {
 113         struct c4iw_debugfs_data *qpd = file->private_data;
 114         if (!qpd) {
 115                 printk(KERN_INFO "%s null qpd?\n", __func__);
 116                 return 0;
 117         }
 118         kfree(qpd->buf);
 119         kfree(qpd);
 120         return 0;
 121 }
 122
 123 static int qp_open(struct inode *inode, struct file *file)
 124 {
 125         struct c4iw_debugfs_data *qpd;
 126         int ret = 0;
 127         int count = 1;
 128
 129         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 130         if (!qpd) {
 131                 ret = -ENOMEM;
 132                 goto out;
 133         }
 134         qpd->devp = inode->i_private;
 135         qpd->pos = 0;
 136
 137         spin_lock_irq(&qpd->devp->lock);
 138         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 139         spin_unlock_irq(&qpd->devp->lock);
 140
 141         qpd->bufsize = count * 128;
 142         qpd->buf = kmalloc(qpd->bufsize, GFP_KERNEL);
 143         if (!qpd->buf) {
 144                 ret = -ENOMEM;
 145                 goto err1;
 146         }
 147
 148         spin_lock_irq(&qpd->devp->lock);
 149         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 150         spin_unlock_irq(&qpd->devp->lock);
 151
 152         qpd->buf[qpd->pos++] = 0;
 153         file->private_data = qpd;
 154         goto out;
 155 err1:
 156         kfree(qpd);
 157 out:
 158         return ret;
 159 }
 160
 161 static const struct file_operations qp_debugfs_fops = {
 162         .owner   = THIS_MODULE,
 163         .open    = qp_open,
 164         .release = qp_release,
 165         .read    = debugfs_read,
 166         .llseek  = default_llseek,
 167 };
 168
 169 static int dump_stag(int id, void *p, void *data)
 170 {
 171         struct c4iw_debugfs_data *stagd = data;
 172         int space;
 173         int cc;
 174
 175         space = stagd->bufsize - stagd->pos - 1;
 176         if (space == 0)
 177                 return 1;
 178
 179         cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
 180         if (cc < space)
 181                 stagd->pos += cc;
 182         return 0;
 183 }
 184
 185 static int stag_release(struct inode *inode, struct file *file)
 186 {
 187         struct c4iw_debugfs_data *stagd = file->private_data;
 188         if (!stagd) {
 189                 printk(KERN_INFO "%s null stagd?\n", __func__);
 190                 return 0;
 191         }
 192         kfree(stagd->buf);
 193         kfree(stagd);
 194         return 0;
 195 }
 196
 197 static int stag_open(struct inode *inode, struct file *file)
 198 {
 199         struct c4iw_debugfs_data *stagd;
 200         int ret = 0;
 201         int count = 1;
 202
 203         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 204         if (!stagd) {
 205                 ret = -ENOMEM;
 206                 goto out;
 207         }
 208         stagd->devp = inode->i_private;
 209         stagd->pos = 0;
 210
 211         spin_lock_irq(&stagd->devp->lock);
 212         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 213         spin_unlock_irq(&stagd->devp->lock);
 214
 215         stagd->bufsize = count * sizeof("0x12345678\n");
 216         stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
 217         if (!stagd->buf) {
 218                 ret = -ENOMEM;
 219                 goto err1;
 220         }
 221
 222         spin_lock_irq(&stagd->devp->lock);
 223         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 224         spin_unlock_irq(&stagd->devp->lock);
 225
 226         stagd->buf[stagd->pos++] = 0;
 227         file->private_data = stagd;
 228         goto out;
 229 err1:
 230         kfree(stagd);
 231 out:
 232         return ret;
 233 }
 234
 235 static const struct file_operations stag_debugfs_fops = {
 236         .owner   = THIS_MODULE,
 237         .open    = stag_open,
 238         .release = stag_release,
 239         .read    = debugfs_read,
 240         .llseek  = default_llseek,
 241 };
 242
 243 static int setup_debugfs(struct c4iw_dev *devp)
 244 {
 245         struct dentry *de;
 246
 247         if (!devp->debugfs_root)
 248                 return -1;
 249
 250         de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
 251                                  (void *)devp, &qp_debugfs_fops);
 252         if (de && de->d_inode)
 253                 de->d_inode->i_size = 4096;
 254
 255         de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
 256                                  (void *)devp, &stag_debugfs_fops);
 257         if (de && de->d_inode)
 258                 de->d_inode->i_size = 4096;
 259         return 0;
 260 }
 261
 262 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 263                                struct c4iw_dev_ucontext *uctx)
 264 {
 265         struct list_head *pos, *nxt;
 266         struct c4iw_qid_list *entry;
 267
 268         mutex_lock(&uctx->lock);
 269         list_for_each_safe(pos, nxt, &uctx->qpids) {
 270                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 271                 list_del_init(&entry->entry);
 272                 if (!(entry->qid & rdev->qpmask))
 273                         c4iw_put_resource(&rdev->resource.qid_fifo, entry->qid,
 274                                           &rdev->resource.qid_fifo_lock);
 275                 kfree(entry);
 276         }
 277
 278         list_for_each_safe(pos, nxt, &uctx->qpids) {
 279                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 280                 list_del_init(&entry->entry);
 281                 kfree(entry);
 282         }
 283         mutex_unlock(&uctx->lock);
 284 }
 285
 286 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 287                             struct c4iw_dev_ucontext *uctx)
 288 {
 289         INIT_LIST_HEAD(&uctx->qpids);
 290         INIT_LIST_HEAD(&uctx->cqids);
 291         mutex_init(&uctx->lock);
 292 }
 293
 294 /* Caller takes care of locking if needed */
 295 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 296 {
 297         int err;
 298
 299         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 300
 301         /*
 302          * qpshift is the number of bits to shift the qpid left in order
 303          * to get the correct address of the doorbell for that qp.
 304          */
 305         rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
 306         rdev->qpmask = rdev->lldi.udb_density - 1;
 307         rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
 308         rdev->cqmask = rdev->lldi.ucq_density - 1;
 309         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 310              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 311              "qp qid start %u size %u cq qid start %u size %u\n",
 312              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 313              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 314              rdev->lldi.vr->pbl.start,
 315              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 316              rdev->lldi.vr->rq.size,
 317              rdev->lldi.vr->qp.start,
 318              rdev->lldi.vr->qp.size,
 319              rdev->lldi.vr->cq.start,
 320              rdev->lldi.vr->cq.size);
 321         PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
 322              "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 323              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 324              (void *)pci_resource_start(rdev->lldi.pdev, 2),
 325              rdev->lldi.db_reg,
 326              rdev->lldi.gts_reg,
 327              rdev->qpshift, rdev->qpmask,
 328              rdev->cqshift, rdev->cqmask);
 329
 330         if (c4iw_num_stags(rdev) == 0) {
 331                 err = -EINVAL;
 332                 goto err1;
 333         }
 334
 335         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 336         if (err) {
 337                 printk(KERN_ERR MOD "error %d initializing resources\n", err);
 338                 goto err1;
 339         }
 340         err = c4iw_pblpool_create(rdev);
 341         if (err) {
 342                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 343                 goto err2;
 344         }
 345         err = c4iw_rqtpool_create(rdev);
 346         if (err) {
 347                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 348                 goto err3;
 349         }
 350         err = c4iw_ocqp_pool_create(rdev);
 351         if (err) {
 352                 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
 353                 goto err4;
 354         }
 355         return 0;
 356 err4:
 357         c4iw_rqtpool_destroy(rdev);
 358 err3:
 359         c4iw_pblpool_destroy(rdev);
 360 err2:
 361         c4iw_destroy_resource(&rdev->resource);
 362 err1:
 363         return err;
 364 }
 365
 366 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 367 {
 368         c4iw_pblpool_destroy(rdev);
 369         c4iw_rqtpool_destroy(rdev);
 370         c4iw_destroy_resource(&rdev->resource);
 371 }
 372
 373 struct uld_ctx {
 374         struct list_head entry;
 375         struct cxgb4_lld_info lldi;
 376         struct c4iw_dev *dev;
 377 };
 378
 379 static void c4iw_remove(struct uld_ctx *ctx)
 380 {
 381         PDBG("%s c4iw_dev %p\n", __func__,  ctx->dev);
 382         c4iw_unregister_device(ctx->dev);
 383         c4iw_rdev_close(&ctx->dev->rdev);
 384         idr_destroy(&ctx->dev->cqidr);
 385         idr_destroy(&ctx->dev->qpidr);
 386         idr_destroy(&ctx->dev->mmidr);
 387         iounmap(ctx->dev->rdev.oc_mw_kva);
 388         ib_dealloc_device(&ctx->dev->ibdev);
 389         ctx->dev = NULL;
 390 }
 391
 392 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 393 {
 394         struct c4iw_dev *devp;
 395         int ret;
 396
 397         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 398         if (!devp) {
 399                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 400                 return ERR_PTR(-ENOMEM);
 401         }
 402         devp->rdev.lldi = *infop;
 403
 404         devp->rdev.oc_mw_pa = pci_resource_start(devp->rdev.lldi.pdev, 2) +
 405                 (pci_resource_len(devp->rdev.lldi.pdev, 2) -
 406                  roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size));
 407         devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 408                                                devp->rdev.lldi.vr->ocq.size);
 409
 410         PDBG(KERN_INFO MOD "ocq memory: "
 411                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 412                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 413                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 414
 415         ret = c4iw_rdev_open(&devp->rdev);
 416         if (ret) {
 417                 mutex_unlock(&dev_mutex);
 418                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 419                 ib_dealloc_device(&devp->ibdev);
 420                 return ERR_PTR(ret);
 421         }
 422
 423         idr_init(&devp->cqidr);
 424         idr_init(&devp->qpidr);
 425         idr_init(&devp->mmidr);
 426         spin_lock_init(&devp->lock);
 427
 428         if (c4iw_debugfs_root) {
 429                 devp->debugfs_root = debugfs_create_dir(
 430                                         pci_name(devp->rdev.lldi.pdev),
 431                                         c4iw_debugfs_root);
 432                 setup_debugfs(devp);
 433         }
 434         return devp;
 435 }
 436
 437 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
 438 {
 439         struct uld_ctx *ctx;
 440         static int vers_printed;
 441         int i;
 442
 443         if (!vers_printed++)
 444                 printk(KERN_INFO MOD "Chelsio T4 RDMA Driver - version %s\n",
 445                        DRV_VERSION);
 446
 447         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 448         if (!ctx) {
 449                 ctx = ERR_PTR(-ENOMEM);
 450                 goto out;
 451         }
 452         ctx->lldi = *infop;
 453
 454         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
 455              __func__, pci_name(ctx->lldi.pdev),
 456              ctx->lldi.nchan, ctx->lldi.nrxq,
 457              ctx->lldi.ntxq, ctx->lldi.nports);
 458
 459         mutex_lock(&dev_mutex);
 460         list_add_tail(&ctx->entry, &uld_ctx_list);
 461         mutex_unlock(&dev_mutex);
 462
 463         for (i = 0; i < ctx->lldi.nrxq; i++)
 464                 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
 465 out:
 466         return ctx;
 467 }
 468
 469 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
 470                         const struct pkt_gl *gl)
 471 {
 472         struct uld_ctx *ctx = handle;
 473         struct c4iw_dev *dev = ctx->dev;
 474         struct sk_buff *skb;
 475         const struct cpl_act_establish *rpl;
 476         unsigned int opcode;
 477
 478         if (gl == NULL) {
 479                 /* omit RSS and rsp_ctrl at end of descriptor */
 480                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
 481
 482                 skb = alloc_skb(256, GFP_ATOMIC);
 483                 if (!skb)
 484                         goto nomem;
 485                 __skb_put(skb, len);
 486                 skb_copy_to_linear_data(skb, &rsp[1], len);
 487         } else if (gl == CXGB4_MSG_AN) {
 488                 const struct rsp_ctrl *rc = (void *)rsp;
 489
 490                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
 491                 c4iw_ev_handler(dev, qid);
 492                 return 0;
 493         } else {
 494                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
 495                 if (unlikely(!skb))
 496                         goto nomem;
 497         }
 498
 499         rpl = cplhdr(skb);
 500         opcode = rpl->ot.opcode;
 501
 502         if (c4iw_handlers[opcode])
 503                 c4iw_handlers[opcode](dev, skb);
 504         else
 505                 printk(KERN_INFO "%s no handler opcode 0x%x...\n", __func__,
 506                        opcode);
 507
 508         return 0;
 509 nomem:
 510         return -1;
 511 }
 512
 513 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
 514 {
 515         struct uld_ctx *ctx = handle;
 516
 517         PDBG("%s new_state %u\n", __func__, new_state);
 518         switch (new_state) {
 519         case CXGB4_STATE_UP:
 520                 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
 521                 if (!ctx->dev) {
 522                         int ret = 0;
 523
 524                         ctx->dev = c4iw_alloc(&ctx->lldi);
 525                         if (!IS_ERR(ctx->dev))
 526                                 ret = c4iw_register_device(ctx->dev);
 527                         if (IS_ERR(ctx->dev) || ret)
 528                                 printk(KERN_ERR MOD
 529                                        "%s: RDMA registration failed: %d\n",
 530                                        pci_name(ctx->lldi.pdev), ret);
 531                 }
 532                 break;
 533         case CXGB4_STATE_DOWN:
 534                 printk(KERN_INFO MOD "%s: Down\n",
 535                        pci_name(ctx->lldi.pdev));
 536                 if (ctx->dev)
 537                         c4iw_remove(ctx);
 538                 break;
 539         case CXGB4_STATE_START_RECOVERY:
 540                 printk(KERN_INFO MOD "%s: Fatal Error\n",
 541                        pci_name(ctx->lldi.pdev));
 542                 if (ctx->dev) {
 543                         struct ib_event event;
 544
 545                         ctx->dev->rdev.flags |= T4_FATAL_ERROR;
 546                         memset(&event, 0, sizeof event);
 547                         event.event  = IB_EVENT_DEVICE_FATAL;
 548                         event.device = &ctx->dev->ibdev;
 549                         ib_dispatch_event(&event);
 550                         c4iw_remove(ctx);
 551                 }
 552                 break;
 553         case CXGB4_STATE_DETACH:
 554                 printk(KERN_INFO MOD "%s: Detach\n",
 555                        pci_name(ctx->lldi.pdev));
 556                 if (ctx->dev)
 557                         c4iw_remove(ctx);
 558                 break;
 559         }
 560         return 0;
 561 }
 562
 563 static struct cxgb4_uld_info c4iw_uld_info = {
 564         .name = DRV_NAME,
 565         .add = c4iw_uld_add,
 566         .rx_handler = c4iw_uld_rx_handler,
 567         .state_change = c4iw_uld_state_change,
 568 };
 569
 570 static int __init c4iw_init_module(void)
 571 {
 572         int err;
 573
 574         err = c4iw_cm_init();
 575         if (err)
 576                 return err;
 577
 578         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
 579         if (!c4iw_debugfs_root)
 580                 printk(KERN_WARNING MOD
 581                        "could not create debugfs entry, continuing\n");
 582
 583         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
 584
 585         return 0;
 586 }
 587
 588 static void __exit c4iw_exit_module(void)
 589 {
 590         struct uld_ctx *ctx, *tmp;
 591
 592         mutex_lock(&dev_mutex);
 593         list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
 594                 if (ctx->dev)
 595                         c4iw_remove(ctx);
 596                 kfree(ctx);
 597         }
 598         mutex_unlock(&dev_mutex);
 599         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
 600         c4iw_cm_term();
 601         debugfs_remove_recursive(c4iw_debugfs_root);
 602 }
 603
 604 module_init(c4iw_init_module);
 605 module_exit(c4iw_exit_module);