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, "qp id %u state %u "
  91                              "ep tid %u state %u %pI4:%u->%pI4:%u\n",
  92                              qp->wq.sq.qid, (int)qp->attr.state,
  93                              qp->ep->hwtid, (int)qp->ep->com.state,
  94                              &qp->ep->com.local_addr.sin_addr.s_addr,
  95                              ntohs(qp->ep->com.local_addr.sin_port),
  96                              &qp->ep->com.remote_addr.sin_addr.s_addr,
  97                              ntohs(qp->ep->com.remote_addr.sin_port));
  98         else
  99                 cc = snprintf(qpd->buf + qpd->pos, space, "qp id %u state %u\n",
 100                               qp->wq.sq.qid, (int)qp->attr.state);
 101         if (cc < space)
 102                 qpd->pos += cc;
 103         return 0;
 104 }
 105
 106 static int qp_release(struct inode *inode, struct file *file)
 107 {
 108         struct c4iw_debugfs_data *qpd = file->private_data;
 109         if (!qpd) {
 110                 printk(KERN_INFO "%s null qpd?\n", __func__);
 111                 return 0;
 112         }
 113         kfree(qpd->buf);
 114         kfree(qpd);
 115         return 0;
 116 }
 117
 118 static int qp_open(struct inode *inode, struct file *file)
 119 {
 120         struct c4iw_debugfs_data *qpd;
 121         int ret = 0;
 122         int count = 1;
 123
 124         qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
 125         if (!qpd) {
 126                 ret = -ENOMEM;
 127                 goto out;
 128         }
 129         qpd->devp = inode->i_private;
 130         qpd->pos = 0;
 131
 132         spin_lock_irq(&qpd->devp->lock);
 133         idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
 134         spin_unlock_irq(&qpd->devp->lock);
 135
 136         qpd->bufsize = count * 128;
 137         qpd->buf = kmalloc(qpd->bufsize, GFP_KERNEL);
 138         if (!qpd->buf) {
 139                 ret = -ENOMEM;
 140                 goto err1;
 141         }
 142
 143         spin_lock_irq(&qpd->devp->lock);
 144         idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
 145         spin_unlock_irq(&qpd->devp->lock);
 146
 147         qpd->buf[qpd->pos++] = 0;
 148         file->private_data = qpd;
 149         goto out;
 150 err1:
 151         kfree(qpd);
 152 out:
 153         return ret;
 154 }
 155
 156 static const struct file_operations qp_debugfs_fops = {
 157         .owner   = THIS_MODULE,
 158         .open    = qp_open,
 159         .release = qp_release,
 160         .read    = debugfs_read,
 161         .llseek  = default_llseek,
 162 };
 163
 164 static int dump_stag(int id, void *p, void *data)
 165 {
 166         struct c4iw_debugfs_data *stagd = data;
 167         int space;
 168         int cc;
 169
 170         space = stagd->bufsize - stagd->pos - 1;
 171         if (space == 0)
 172                 return 1;
 173
 174         cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
 175         if (cc < space)
 176                 stagd->pos += cc;
 177         return 0;
 178 }
 179
 180 static int stag_release(struct inode *inode, struct file *file)
 181 {
 182         struct c4iw_debugfs_data *stagd = file->private_data;
 183         if (!stagd) {
 184                 printk(KERN_INFO "%s null stagd?\n", __func__);
 185                 return 0;
 186         }
 187         kfree(stagd->buf);
 188         kfree(stagd);
 189         return 0;
 190 }
 191
 192 static int stag_open(struct inode *inode, struct file *file)
 193 {
 194         struct c4iw_debugfs_data *stagd;
 195         int ret = 0;
 196         int count = 1;
 197
 198         stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
 199         if (!stagd) {
 200                 ret = -ENOMEM;
 201                 goto out;
 202         }
 203         stagd->devp = inode->i_private;
 204         stagd->pos = 0;
 205
 206         spin_lock_irq(&stagd->devp->lock);
 207         idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
 208         spin_unlock_irq(&stagd->devp->lock);
 209
 210         stagd->bufsize = count * sizeof("0x12345678\n");
 211         stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
 212         if (!stagd->buf) {
 213                 ret = -ENOMEM;
 214                 goto err1;
 215         }
 216
 217         spin_lock_irq(&stagd->devp->lock);
 218         idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
 219         spin_unlock_irq(&stagd->devp->lock);
 220
 221         stagd->buf[stagd->pos++] = 0;
 222         file->private_data = stagd;
 223         goto out;
 224 err1:
 225         kfree(stagd);
 226 out:
 227         return ret;
 228 }
 229
 230 static const struct file_operations stag_debugfs_fops = {
 231         .owner   = THIS_MODULE,
 232         .open    = stag_open,
 233         .release = stag_release,
 234         .read    = debugfs_read,
 235         .llseek  = default_llseek,
 236 };
 237
 238 static int setup_debugfs(struct c4iw_dev *devp)
 239 {
 240         struct dentry *de;
 241
 242         if (!devp->debugfs_root)
 243                 return -1;
 244
 245         de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
 246                                  (void *)devp, &qp_debugfs_fops);
 247         if (de && de->d_inode)
 248                 de->d_inode->i_size = 4096;
 249
 250         de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
 251                                  (void *)devp, &stag_debugfs_fops);
 252         if (de && de->d_inode)
 253                 de->d_inode->i_size = 4096;
 254         return 0;
 255 }
 256
 257 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 258                                struct c4iw_dev_ucontext *uctx)
 259 {
 260         struct list_head *pos, *nxt;
 261         struct c4iw_qid_list *entry;
 262
 263         mutex_lock(&uctx->lock);
 264         list_for_each_safe(pos, nxt, &uctx->qpids) {
 265                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 266                 list_del_init(&entry->entry);
 267                 if (!(entry->qid & rdev->qpmask))
 268                         c4iw_put_resource(&rdev->resource.qid_fifo, entry->qid,
 269                                           &rdev->resource.qid_fifo_lock);
 270                 kfree(entry);
 271         }
 272
 273         list_for_each_safe(pos, nxt, &uctx->qpids) {
 274                 entry = list_entry(pos, struct c4iw_qid_list, entry);
 275                 list_del_init(&entry->entry);
 276                 kfree(entry);
 277         }
 278         mutex_unlock(&uctx->lock);
 279 }
 280
 281 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 282                             struct c4iw_dev_ucontext *uctx)
 283 {
 284         INIT_LIST_HEAD(&uctx->qpids);
 285         INIT_LIST_HEAD(&uctx->cqids);
 286         mutex_init(&uctx->lock);
 287 }
 288
 289 /* Caller takes care of locking if needed */
 290 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 291 {
 292         int err;
 293
 294         c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 295
 296         /*
 297          * qpshift is the number of bits to shift the qpid left in order
 298          * to get the correct address of the doorbell for that qp.
 299          */
 300         rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
 301         rdev->qpmask = rdev->lldi.udb_density - 1;
 302         rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
 303         rdev->cqmask = rdev->lldi.ucq_density - 1;
 304         PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
 305              "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
 306              "qp qid start %u size %u cq qid start %u size %u\n",
 307              __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
 308              rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
 309              rdev->lldi.vr->pbl.start,
 310              rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
 311              rdev->lldi.vr->rq.size,
 312              rdev->lldi.vr->qp.start,
 313              rdev->lldi.vr->qp.size,
 314              rdev->lldi.vr->cq.start,
 315              rdev->lldi.vr->cq.size);
 316         PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
 317              "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
 318              (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
 319              (void *)pci_resource_start(rdev->lldi.pdev, 2),
 320              rdev->lldi.db_reg,
 321              rdev->lldi.gts_reg,
 322              rdev->qpshift, rdev->qpmask,
 323              rdev->cqshift, rdev->cqmask);
 324
 325         if (c4iw_num_stags(rdev) == 0) {
 326                 err = -EINVAL;
 327                 goto err1;
 328         }
 329
 330         err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
 331         if (err) {
 332                 printk(KERN_ERR MOD "error %d initializing resources\n", err);
 333                 goto err1;
 334         }
 335         err = c4iw_pblpool_create(rdev);
 336         if (err) {
 337                 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
 338                 goto err2;
 339         }
 340         err = c4iw_rqtpool_create(rdev);
 341         if (err) {
 342                 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
 343                 goto err3;
 344         }
 345         err = c4iw_ocqp_pool_create(rdev);
 346         if (err) {
 347                 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
 348                 goto err4;
 349         }
 350         return 0;
 351 err4:
 352         c4iw_rqtpool_destroy(rdev);
 353 err3:
 354         c4iw_pblpool_destroy(rdev);
 355 err2:
 356         c4iw_destroy_resource(&rdev->resource);
 357 err1:
 358         return err;
 359 }
 360
 361 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
 362 {
 363         c4iw_pblpool_destroy(rdev);
 364         c4iw_rqtpool_destroy(rdev);
 365         c4iw_destroy_resource(&rdev->resource);
 366 }
 367
 368 static void c4iw_remove(struct c4iw_dev *dev)
 369 {
 370         PDBG("%s c4iw_dev %p\n", __func__,  dev);
 371         cancel_delayed_work_sync(&dev->db_drop_task);
 372         list_del(&dev->entry);
 373         if (dev->registered)
 374                 c4iw_unregister_device(dev);
 375         c4iw_rdev_close(&dev->rdev);
 376         idr_destroy(&dev->cqidr);
 377         idr_destroy(&dev->qpidr);
 378         idr_destroy(&dev->mmidr);
 379         iounmap(dev->rdev.oc_mw_kva);
 380         ib_dealloc_device(&dev->ibdev);
 381 }
 382
 383 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
 384 {
 385         struct c4iw_dev *devp;
 386         int ret;
 387
 388         devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
 389         if (!devp) {
 390                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 391                 return NULL;
 392         }
 393         devp->rdev.lldi = *infop;
 394
 395         devp->rdev.oc_mw_pa = pci_resource_start(devp->rdev.lldi.pdev, 2) +
 396                 (pci_resource_len(devp->rdev.lldi.pdev, 2) -
 397                  roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size));
 398         devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
 399                                                devp->rdev.lldi.vr->ocq.size);
 400
 401         printk(KERN_INFO MOD "ocq memory: "
 402                "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
 403                devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
 404                devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
 405
 406         mutex_lock(&dev_mutex);
 407
 408         ret = c4iw_rdev_open(&devp->rdev);
 409         if (ret) {
 410                 mutex_unlock(&dev_mutex);
 411                 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
 412                 ib_dealloc_device(&devp->ibdev);
 413                 return NULL;
 414         }
 415
 416         idr_init(&devp->cqidr);
 417         idr_init(&devp->qpidr);
 418         idr_init(&devp->mmidr);
 419         spin_lock_init(&devp->lock);
 420         list_add_tail(&devp->entry, &dev_list);
 421         mutex_unlock(&dev_mutex);
 422
 423         if (c4iw_debugfs_root) {
 424                 devp->debugfs_root = debugfs_create_dir(
 425                                         pci_name(devp->rdev.lldi.pdev),
 426                                         c4iw_debugfs_root);
 427                 setup_debugfs(devp);
 428         }
 429         return devp;
 430 }
 431
 432 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
 433 {
 434         struct c4iw_dev *dev;
 435         static int vers_printed;
 436         int i;
 437
 438         if (!vers_printed++)
 439                 printk(KERN_INFO MOD "Chelsio T4 RDMA Driver - version %s\n",
 440                        DRV_VERSION);
 441
 442         dev = c4iw_alloc(infop);
 443         if (!dev)
 444                 goto out;
 445
 446         PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
 447              __func__, pci_name(dev->rdev.lldi.pdev),
 448              dev->rdev.lldi.nchan, dev->rdev.lldi.nrxq,
 449              dev->rdev.lldi.ntxq, dev->rdev.lldi.nports);
 450
 451         for (i = 0; i < dev->rdev.lldi.nrxq; i++)
 452                 PDBG("rxqid[%u] %u\n", i, dev->rdev.lldi.rxq_ids[i]);
 453 out:
 454         return dev;
 455 }
 456
 457 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
 458                         const struct pkt_gl *gl)
 459 {
 460         struct c4iw_dev *dev = handle;
 461         struct sk_buff *skb;
 462         const struct cpl_act_establish *rpl;
 463         unsigned int opcode;
 464
 465         if (gl == NULL) {
 466                 /* omit RSS and rsp_ctrl at end of descriptor */
 467                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
 468
 469                 skb = alloc_skb(256, GFP_ATOMIC);
 470                 if (!skb)
 471                         goto nomem;
 472                 __skb_put(skb, len);
 473                 skb_copy_to_linear_data(skb, &rsp[1], len);
 474         } else if (gl == CXGB4_MSG_AN) {
 475                 const struct rsp_ctrl *rc = (void *)rsp;
 476
 477                 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
 478                 c4iw_ev_handler(dev, qid);
 479                 return 0;
 480         } else {
 481                 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
 482                 if (unlikely(!skb))
 483                         goto nomem;
 484         }
 485
 486         rpl = cplhdr(skb);
 487         opcode = rpl->ot.opcode;
 488
 489         if (c4iw_handlers[opcode])
 490                 c4iw_handlers[opcode](dev, skb);
 491         else
 492                 printk(KERN_INFO "%s no handler opcode 0x%x...\n", __func__,
 493                        opcode);
 494
 495         return 0;
 496 nomem:
 497         return -1;
 498 }
 499
 500 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
 501 {
 502         struct c4iw_dev *dev = handle;
 503
 504         PDBG("%s new_state %u\n", __func__, new_state);
 505         switch (new_state) {
 506         case CXGB4_STATE_UP:
 507                 printk(KERN_INFO MOD "%s: Up\n", pci_name(dev->rdev.lldi.pdev));
 508                 if (!dev->registered) {
 509                         int ret;
 510                         ret = c4iw_register_device(dev);
 511                         if (ret)
 512                                 printk(KERN_ERR MOD
 513                                        "%s: RDMA registration failed: %d\n",
 514                                        pci_name(dev->rdev.lldi.pdev), ret);
 515                 }
 516                 break;
 517         case CXGB4_STATE_DOWN:
 518                 printk(KERN_INFO MOD "%s: Down\n",
 519                        pci_name(dev->rdev.lldi.pdev));
 520                 if (dev->registered)
 521                         c4iw_unregister_device(dev);
 522                 break;
 523         case CXGB4_STATE_START_RECOVERY:
 524                 printk(KERN_INFO MOD "%s: Fatal Error\n",
 525                        pci_name(dev->rdev.lldi.pdev));
 526                 if (dev->registered)
 527                         c4iw_unregister_device(dev);
 528                 break;
 529         case CXGB4_STATE_DETACH:
 530                 printk(KERN_INFO MOD "%s: Detach\n",
 531                        pci_name(dev->rdev.lldi.pdev));
 532                 mutex_lock(&dev_mutex);
 533                 c4iw_remove(dev);
 534                 mutex_unlock(&dev_mutex);
 535                 break;
 536         }
 537         return 0;
 538 }
 539
 540 static struct cxgb4_uld_info c4iw_uld_info = {
 541         .name = DRV_NAME,
 542         .add = c4iw_uld_add,
 543         .rx_handler = c4iw_uld_rx_handler,
 544         .state_change = c4iw_uld_state_change,
 545 };
 546
 547 static int __init c4iw_init_module(void)
 548 {
 549         int err;
 550
 551         err = c4iw_cm_init();
 552         if (err)
 553                 return err;
 554
 555         c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
 556         if (!c4iw_debugfs_root)
 557                 printk(KERN_WARNING MOD
 558                        "could not create debugfs entry, continuing\n");
 559
 560         cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
 561
 562         return 0;
 563 }
 564
 565 static void __exit c4iw_exit_module(void)
 566 {
 567         struct c4iw_dev *dev, *tmp;
 568
 569         mutex_lock(&dev_mutex);
 570         list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
 571                 c4iw_remove(dev);
 572         }
 573         mutex_unlock(&dev_mutex);
 574         cxgb4_unregister_uld(CXGB4_ULD_RDMA);
 575         c4iw_cm_term();
 576         debugfs_remove_recursive(c4iw_debugfs_root);
 577 }
 578
 579 module_init(c4iw_init_module);
 580 module_exit(c4iw_exit_module);