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(dev_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 static void c4iw_remove(struct c4iw_dev *dev)
 374 {
 375         PDBG("%s c4iw_dev %p\n", __func__,  dev);
 376         list_del(&dev->entry);
 377         if (dev->registered)
 378                 c4iw_unregister_device(dev);
 379         c4iw_rdev_close(&dev->rdev);
 380         idr_destroy(&dev->cqidr);
 381         idr_destroy(&dev->qpidr);
 382         idr_destroy(&dev->mmidr);
 383         iounmap(dev->rdev.oc_mw_kva);
 384         ib_dealloc_device(&dev->ibdev);
 385 }
 386
 387 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 388 {
 389         struct c4iw_dev *devp;
 390         int ret;
 391
 392         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 393         if (!devp) {
 394                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 395                 return NULL;
 396         }
 397         devp->rdev.lldi = *infop;
 398
 399         devp->rdev.oc_mw_pa = pci_resource_start(devp->rdev.lldi.pdev, 2) +
 400                 (pci_resource_len(devp->rdev.lldi.pdev, 2) -
 401                  roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size));
 402         devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 403                                                devp->rdev.lldi.vr->ocq.size);
 404
 405         printk(KERN_INFO MOD "ocq memory: "
 406                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 407                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 408                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 409
 410         mutex_lock(&dev_mutex);
 411
 412         ret = c4iw_rdev_open(&devp->rdev);
 413         if (ret) {
 414                 mutex_unlock(&dev_mutex);
 415                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 416                 ib_dealloc_device(&devp->ibdev);
 417                 return NULL;
 418         }
 419
 420         idr_init(&devp->cqidr);
 421         idr_init(&devp->qpidr);
 422         idr_init(&devp->mmidr);
 423         spin_lock_init(&devp->lock);
 424         list_add_tail(&devp->entry, &dev_list);
 425         mutex_unlock(&dev_mutex);
 426
 427         if (c4iw_debugfs_root) {
 428                 devp->debugfs_root = debugfs_create_dir(
 429                                         pci_name(devp->rdev.lldi.pdev),
 430                                         c4iw_debugfs_root);
 431                 setup_debugfs(devp);
 432         }
 433         return devp;
 434 }
 435
 436 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
 437 {
 438         struct c4iw_dev *dev;
 439         static int vers_printed;
 440         int i;
 441
 442         if (!vers_printed++)
 443                 printk(KERN_INFO MOD "Chelsio T4 RDMA Driver - version %s\n",
 444                        DRV_VERSION);
 445
 446         dev = c4iw_alloc(infop);
 447         if (!dev)
 448                 goto out;
 449
 450         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
 451              __func__, pci_name(dev->rdev.lldi.pdev),
 452              dev->rdev.lldi.nchan, dev->rdev.lldi.nrxq,
 453              dev->rdev.lldi.ntxq, dev->rdev.lldi.nports);
 454
 455         for (i = 0; i < dev->rdev.lldi.nrxq; i++)
 456                 PDBG("rxqid[%u] %u\n", i, dev->rdev.lldi.rxq_ids[i]);
 457 out:
 458         return dev;
 459 }
 460
 461 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
 462                         const struct pkt_gl *gl)
 463 {
 464         struct c4iw_dev *dev = handle;
 465         struct sk_buff *skb;
 466         const struct cpl_act_establish *rpl;
 467         unsigned int opcode;
 468
 469         if (gl == NULL) {
 470                 /* omit RSS and rsp_ctrl at end of descriptor */
 471                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
 472
 473                 skb = alloc_skb(256, GFP_ATOMIC);
 474                 if (!skb)
 475                         goto nomem;
 476                 __skb_put(skb, len);
 477                 skb_copy_to_linear_data(skb, &rsp[1], len);
 478         } else if (gl == CXGB4_MSG_AN) {
 479                 const struct rsp_ctrl *rc = (void *)rsp;
 480
 481                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
 482                 c4iw_ev_handler(dev, qid);
 483                 return 0;
 484         } else {
 485                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
 486                 if (unlikely(!skb))
 487                         goto nomem;
 488         }
 489
 490         rpl = cplhdr(skb);
 491         opcode = rpl->ot.opcode;
 492
 493         if (c4iw_handlers[opcode])
 494                 c4iw_handlers[opcode](dev, skb);
 495         else
 496                 printk(KERN_INFO "%s no handler opcode 0x%x...\n", __func__,
 497                        opcode);
 498
 499         return 0;
 500 nomem:
 501         return -1;
 502 }
 503
 504 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
 505 {
 506         struct c4iw_dev *dev = handle;
 507
 508         PDBG("%s new_state %u\n", __func__, new_state);
 509         switch (new_state) {
 510         case CXGB4_STATE_UP:
 511                 printk(KERN_INFO MOD "%s: Up\n", pci_name(dev->rdev.lldi.pdev));
 512                 if (!dev->registered) {
 513                         int ret;
 514                         ret = c4iw_register_device(dev);
 515                         if (ret)
 516                                 printk(KERN_ERR MOD
 517                                        "%s: RDMA registration failed: %d\n",
 518                                        pci_name(dev->rdev.lldi.pdev), ret);
 519                 }
 520                 break;
 521         case CXGB4_STATE_DOWN:
 522                 printk(KERN_INFO MOD "%s: Down\n",
 523                        pci_name(dev->rdev.lldi.pdev));
 524                 if (dev->registered)
 525                         c4iw_unregister_device(dev);
 526                 break;
 527         case CXGB4_STATE_START_RECOVERY:
 528                 printk(KERN_INFO MOD "%s: Fatal Error\n",
 529                        pci_name(dev->rdev.lldi.pdev));
 530                 dev->rdev.flags |= T4_FATAL_ERROR;
 531                 if (dev->registered) {
 532                         struct ib_event event;
 533
 534                         memset(&event, 0, sizeof event);
 535                         event.event  = IB_EVENT_DEVICE_FATAL;
 536                         event.device = &dev->ibdev;
 537                         ib_dispatch_event(&event);
 538                         c4iw_unregister_device(dev);
 539                 }
 540                 break;
 541         case CXGB4_STATE_DETACH:
 542                 printk(KERN_INFO MOD "%s: Detach\n",
 543                        pci_name(dev->rdev.lldi.pdev));
 544                 mutex_lock(&dev_mutex);
 545                 c4iw_remove(dev);
 546                 mutex_unlock(&dev_mutex);
 547                 break;
 548         }
 549         return 0;
 550 }
 551
 552 static struct cxgb4_uld_info c4iw_uld_info = {
 553         .name = DRV_NAME,
 554         .add = c4iw_uld_add,
 555         .rx_handler = c4iw_uld_rx_handler,
 556         .state_change = c4iw_uld_state_change,
 557 };
 558
 559 static int __init c4iw_init_module(void)
 560 {
 561         int err;
 562
 563         err = c4iw_cm_init();
 564         if (err)
 565                 return err;
 566
 567         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
 568         if (!c4iw_debugfs_root)
 569                 printk(KERN_WARNING MOD
 570                        "could not create debugfs entry, continuing\n");
 571
 572         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
 573
 574         return 0;
 575 }
 576
 577 static void __exit c4iw_exit_module(void)
 578 {
 579         struct c4iw_dev *dev, *tmp;
 580
 581         mutex_lock(&dev_mutex);
 582         list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
 583                 c4iw_remove(dev);
 584         }
 585         mutex_unlock(&dev_mutex);
 586         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
 587         c4iw_cm_term();
 588         debugfs_remove_recursive(c4iw_debugfs_root);
 589 }
 590
 591 module_init(c4iw_init_module);
 592 module_exit(c4iw_exit_module);