1 /*
2 * This file is part of the Chelsio FCoE driver for Linux.
3 *
4 * Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
36
37 #include <linux/kernel.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/pci.h>
41 #include <linux/mm.h>
42 #include <linux/notifier.h>
43 #include <linux/kdebug.h>
44 #include <linux/seq_file.h>
45 #include <linux/debugfs.h>
46 #include <linux/string.h>
47 #include <linux/export.h>
48
49 #include "csio_init.h"
50 #include "csio_defs.h"
51
52 #define CSIO_MIN_MEMPOOL_SZ 64
53
54 static struct dentry *csio_debugfs_root;
55
56 static struct scsi_transport_template *csio_fcoe_transport;
57 static struct scsi_transport_template *csio_fcoe_transport_vport;
58
59 /*
60 * debugfs support
61 */
62 static ssize_t
csio_mem_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)63 csio_mem_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
64 {
65 loff_t pos = *ppos;
66 loff_t avail = file_inode(file)->i_size;
67 unsigned int mem = (uintptr_t)file->private_data & 3;
68 struct csio_hw *hw = file->private_data - mem;
69
70 if (pos < 0)
71 return -EINVAL;
72 if (pos >= avail)
73 return 0;
74 if (count > avail - pos)
75 count = avail - pos;
76
77 while (count) {
78 size_t len;
79 int ret, ofst;
80 __be32 data[16];
81
82 if (mem == MEM_MC)
83 ret = hw->chip_ops->chip_mc_read(hw, 0, pos,
84 data, NULL);
85 else
86 ret = hw->chip_ops->chip_edc_read(hw, mem, pos,
87 data, NULL);
88 if (ret)
89 return ret;
90
91 ofst = pos % sizeof(data);
92 len = min(count, sizeof(data) - ofst);
93 if (copy_to_user(buf, (u8 *)data + ofst, len))
94 return -EFAULT;
95
96 buf += len;
97 pos += len;
98 count -= len;
99 }
100 count = pos - *ppos;
101 *ppos = pos;
102 return count;
103 }
104
105 static const struct file_operations csio_mem_debugfs_fops = {
106 .owner = THIS_MODULE,
107 .open = simple_open,
108 .read = csio_mem_read,
109 .llseek = default_llseek,
110 };
111
csio_add_debugfs_mem(struct csio_hw * hw,const char * name,unsigned int idx,unsigned int size_mb)112 void csio_add_debugfs_mem(struct csio_hw *hw, const char *name,
113 unsigned int idx, unsigned int size_mb)
114 {
115 debugfs_create_file_size(name, S_IRUSR, hw->debugfs_root,
116 (void *)hw + idx, &csio_mem_debugfs_fops,
117 size_mb << 20);
118 }
119
csio_setup_debugfs(struct csio_hw * hw)120 static int csio_setup_debugfs(struct csio_hw *hw)
121 {
122 int i;
123
124 if (IS_ERR_OR_NULL(hw->debugfs_root))
125 return -1;
126
127 i = csio_rd_reg32(hw, MA_TARGET_MEM_ENABLE_A);
128 if (i & EDRAM0_ENABLE_F)
129 csio_add_debugfs_mem(hw, "edc0", MEM_EDC0, 5);
130 if (i & EDRAM1_ENABLE_F)
131 csio_add_debugfs_mem(hw, "edc1", MEM_EDC1, 5);
132
133 hw->chip_ops->chip_dfs_create_ext_mem(hw);
134 return 0;
135 }
136
137 /*
138 * csio_dfs_create - Creates and sets up per-hw debugfs.
139 *
140 */
141 static int
csio_dfs_create(struct csio_hw * hw)142 csio_dfs_create(struct csio_hw *hw)
143 {
144 if (csio_debugfs_root) {
145 hw->debugfs_root = debugfs_create_dir(pci_name(hw->pdev),
146 csio_debugfs_root);
147 csio_setup_debugfs(hw);
148 }
149
150 return 0;
151 }
152
153 /*
154 * csio_dfs_destroy - Destroys per-hw debugfs.
155 */
156 static void
csio_dfs_destroy(struct csio_hw * hw)157 csio_dfs_destroy(struct csio_hw *hw)
158 {
159 debugfs_remove_recursive(hw->debugfs_root);
160 }
161
162 /*
163 * csio_dfs_init - Debug filesystem initialization for the module.
164 *
165 */
166 static void
csio_dfs_init(void)167 csio_dfs_init(void)
168 {
169 csio_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
170 }
171
172 /*
173 * csio_dfs_exit - debugfs cleanup for the module.
174 */
175 static void
csio_dfs_exit(void)176 csio_dfs_exit(void)
177 {
178 debugfs_remove(csio_debugfs_root);
179 }
180
181 /*
182 * csio_pci_init - PCI initialization.
183 * @pdev: PCI device.
184 * @bars: Bitmask of bars to be requested.
185 *
186 * Initializes the PCI function by enabling MMIO, setting bus
187 * mastership and setting DMA mask.
188 */
189 static int
csio_pci_init(struct pci_dev * pdev,int * bars)190 csio_pci_init(struct pci_dev *pdev, int *bars)
191 {
192 int rv = -ENODEV;
193
194 *bars = pci_select_bars(pdev, IORESOURCE_MEM);
195
196 if (pci_enable_device_mem(pdev))
197 goto err;
198
199 if (pci_request_selected_regions(pdev, *bars, KBUILD_MODNAME))
200 goto err_disable_device;
201
202 pci_set_master(pdev);
203 pci_try_set_mwi(pdev);
204
205 rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
206 if (rv)
207 rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
208 if (rv) {
209 rv = -ENODEV;
210 dev_err(&pdev->dev, "No suitable DMA available.\n");
211 goto err_release_regions;
212 }
213
214 return 0;
215
216 err_release_regions:
217 pci_release_selected_regions(pdev, *bars);
218 err_disable_device:
219 pci_disable_device(pdev);
220 err:
221 return rv;
222
223 }
224
225 /*
226 * csio_pci_exit - PCI unitialization.
227 * @pdev: PCI device.
228 * @bars: Bars to be released.
229 *
230 */
231 static void
csio_pci_exit(struct pci_dev * pdev,int * bars)232 csio_pci_exit(struct pci_dev *pdev, int *bars)
233 {
234 pci_release_selected_regions(pdev, *bars);
235 pci_disable_device(pdev);
236 }
237
238 /*
239 * csio_hw_init_workers - Initialize the HW module's worker threads.
240 * @hw: HW module.
241 *
242 */
243 static void
csio_hw_init_workers(struct csio_hw * hw)244 csio_hw_init_workers(struct csio_hw *hw)
245 {
246 INIT_WORK(&hw->evtq_work, csio_evtq_worker);
247 }
248
249 static void
csio_hw_exit_workers(struct csio_hw * hw)250 csio_hw_exit_workers(struct csio_hw *hw)
251 {
252 cancel_work_sync(&hw->evtq_work);
253 }
254
255 static int
csio_create_queues(struct csio_hw * hw)256 csio_create_queues(struct csio_hw *hw)
257 {
258 int i, j;
259 struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
260 int rv;
261 struct csio_scsi_cpu_info *info;
262
263 if (hw->flags & CSIO_HWF_Q_FW_ALLOCED)
264 return 0;
265
266 if (hw->intr_mode != CSIO_IM_MSIX) {
267 rv = csio_wr_iq_create(hw, NULL, hw->intr_iq_idx,
268 0, hw->pport[0].portid, false, NULL);
269 if (rv != 0) {
270 csio_err(hw, " Forward Interrupt IQ failed!: %d\n", rv);
271 return rv;
272 }
273 }
274
275 /* FW event queue */
276 rv = csio_wr_iq_create(hw, NULL, hw->fwevt_iq_idx,
277 csio_get_fwevt_intr_idx(hw),
278 hw->pport[0].portid, true, NULL);
279 if (rv != 0) {
280 csio_err(hw, "FW event IQ config failed!: %d\n", rv);
281 return rv;
282 }
283
284 /* Create mgmt queue */
285 rv = csio_wr_eq_create(hw, NULL, mgmtm->eq_idx,
286 mgmtm->iq_idx, hw->pport[0].portid, NULL);
287
288 if (rv != 0) {
289 csio_err(hw, "Mgmt EQ create failed!: %d\n", rv);
290 goto err;
291 }
292
293 /* Create SCSI queues */
294 for (i = 0; i < hw->num_pports; i++) {
295 info = &hw->scsi_cpu_info[i];
296
297 for (j = 0; j < info->max_cpus; j++) {
298 struct csio_scsi_qset *sqset = &hw->sqset[i][j];
299
300 rv = csio_wr_iq_create(hw, NULL, sqset->iq_idx,
301 sqset->intr_idx, i, false, NULL);
302 if (rv != 0) {
303 csio_err(hw,
304 "SCSI module IQ config failed [%d][%d]:%d\n",
305 i, j, rv);
306 goto err;
307 }
308 rv = csio_wr_eq_create(hw, NULL, sqset->eq_idx,
309 sqset->iq_idx, i, NULL);
310 if (rv != 0) {
311 csio_err(hw,
312 "SCSI module EQ config failed [%d][%d]:%d\n",
313 i, j, rv);
314 goto err;
315 }
316 } /* for all CPUs */
317 } /* For all ports */
318
319 hw->flags |= CSIO_HWF_Q_FW_ALLOCED;
320 return 0;
321 err:
322 csio_wr_destroy_queues(hw, true);
323 return -EINVAL;
324 }
325
326 /*
327 * csio_config_queues - Configure the DMA queues.
328 * @hw: HW module.
329 *
330 * Allocates memory for queues are registers them with FW.
331 */
332 int
csio_config_queues(struct csio_hw * hw)333 csio_config_queues(struct csio_hw *hw)
334 {
335 int i, j, idx, k = 0;
336 int rv;
337 struct csio_scsi_qset *sqset;
338 struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
339 struct csio_scsi_qset *orig;
340 struct csio_scsi_cpu_info *info;
341
342 if (hw->flags & CSIO_HWF_Q_MEM_ALLOCED)
343 return csio_create_queues(hw);
344
345 /* Calculate number of SCSI queues for MSIX we would like */
346 hw->num_scsi_msix_cpus = num_online_cpus();
347 hw->num_sqsets = num_online_cpus() * hw->num_pports;
348
349 if (hw->num_sqsets > CSIO_MAX_SCSI_QSETS) {
350 hw->num_sqsets = CSIO_MAX_SCSI_QSETS;
351 hw->num_scsi_msix_cpus = CSIO_MAX_SCSI_CPU;
352 }
353
354 /* Initialize max_cpus, may get reduced during msix allocations */
355 for (i = 0; i < hw->num_pports; i++)
356 hw->scsi_cpu_info[i].max_cpus = hw->num_scsi_msix_cpus;
357
358 csio_dbg(hw, "nsqsets:%d scpus:%d\n",
359 hw->num_sqsets, hw->num_scsi_msix_cpus);
360
361 csio_intr_enable(hw);
362
363 if (hw->intr_mode != CSIO_IM_MSIX) {
364
365 /* Allocate Forward interrupt iq. */
366 hw->intr_iq_idx = csio_wr_alloc_q(hw, CSIO_INTR_IQSIZE,
367 CSIO_INTR_WRSIZE, CSIO_INGRESS,
368 (void *)hw, 0, 0, NULL);
369 if (hw->intr_iq_idx == -1) {
370 csio_err(hw,
371 "Forward interrupt queue creation failed\n");
372 goto intr_disable;
373 }
374 }
375
376 /* Allocate the FW evt queue */
377 hw->fwevt_iq_idx = csio_wr_alloc_q(hw, CSIO_FWEVT_IQSIZE,
378 CSIO_FWEVT_WRSIZE,
379 CSIO_INGRESS, (void *)hw,
380 CSIO_FWEVT_FLBUFS, 0,
381 csio_fwevt_intx_handler);
382 if (hw->fwevt_iq_idx == -1) {
383 csio_err(hw, "FW evt queue creation failed\n");
384 goto intr_disable;
385 }
386
387 /* Allocate the mgmt queue */
388 mgmtm->eq_idx = csio_wr_alloc_q(hw, CSIO_MGMT_EQSIZE,
389 CSIO_MGMT_EQ_WRSIZE,
390 CSIO_EGRESS, (void *)hw, 0, 0, NULL);
391 if (mgmtm->eq_idx == -1) {
392 csio_err(hw, "Failed to alloc egress queue for mgmt module\n");
393 goto intr_disable;
394 }
395
396 /* Use FW IQ for MGMT req completion */
397 mgmtm->iq_idx = hw->fwevt_iq_idx;
398
399 /* Allocate SCSI queues */
400 for (i = 0; i < hw->num_pports; i++) {
401 info = &hw->scsi_cpu_info[i];
402
403 for (j = 0; j < hw->num_scsi_msix_cpus; j++) {
404 sqset = &hw->sqset[i][j];
405
406 if (j >= info->max_cpus) {
407 k = j % info->max_cpus;
408 orig = &hw->sqset[i][k];
409 sqset->eq_idx = orig->eq_idx;
410 sqset->iq_idx = orig->iq_idx;
411 continue;
412 }
413
414 idx = csio_wr_alloc_q(hw, csio_scsi_eqsize, 0,
415 CSIO_EGRESS, (void *)hw, 0, 0,
416 NULL);
417 if (idx == -1) {
418 csio_err(hw, "EQ creation failed for idx:%d\n",
419 idx);
420 goto intr_disable;
421 }
422
423 sqset->eq_idx = idx;
424
425 idx = csio_wr_alloc_q(hw, CSIO_SCSI_IQSIZE,
426 CSIO_SCSI_IQ_WRSZ, CSIO_INGRESS,
427 (void *)hw, 0, 0,
428 csio_scsi_intx_handler);
429 if (idx == -1) {
430 csio_err(hw, "IQ creation failed for idx:%d\n",
431 idx);
432 goto intr_disable;
433 }
434 sqset->iq_idx = idx;
435 } /* for all CPUs */
436 } /* For all ports */
437
438 hw->flags |= CSIO_HWF_Q_MEM_ALLOCED;
439
440 rv = csio_create_queues(hw);
441 if (rv != 0)
442 goto intr_disable;
443
444 /*
445 * Now request IRQs for the vectors. In the event of a failure,
446 * cleanup is handled internally by this function.
447 */
448 rv = csio_request_irqs(hw);
449 if (rv != 0)
450 return -EINVAL;
451
452 return 0;
453
454 intr_disable:
455 csio_intr_disable(hw, false);
456
457 return -EINVAL;
458 }
459
460 static int
csio_resource_alloc(struct csio_hw * hw)461 csio_resource_alloc(struct csio_hw *hw)
462 {
463 struct csio_wrm *wrm = csio_hw_to_wrm(hw);
464 int rv = -ENOMEM;
465
466 wrm->num_q = ((CSIO_MAX_SCSI_QSETS * 2) + CSIO_HW_NIQ +
467 CSIO_HW_NEQ + CSIO_HW_NFLQ + CSIO_HW_NINTXQ);
468
469 hw->mb_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
470 sizeof(struct csio_mb));
471 if (!hw->mb_mempool)
472 goto err;
473
474 hw->rnode_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
475 sizeof(struct csio_rnode));
476 if (!hw->rnode_mempool)
477 goto err_free_mb_mempool;
478
479 hw->scsi_dma_pool = dma_pool_create("csio_scsi_dma_pool",
480 &hw->pdev->dev, CSIO_SCSI_RSP_LEN,
481 8, 0);
482 if (!hw->scsi_dma_pool)
483 goto err_free_rn_pool;
484
485 return 0;
486
487 err_free_rn_pool:
488 mempool_destroy(hw->rnode_mempool);
489 hw->rnode_mempool = NULL;
490 err_free_mb_mempool:
491 mempool_destroy(hw->mb_mempool);
492 hw->mb_mempool = NULL;
493 err:
494 return rv;
495 }
496
497 static void
csio_resource_free(struct csio_hw * hw)498 csio_resource_free(struct csio_hw *hw)
499 {
500 dma_pool_destroy(hw->scsi_dma_pool);
501 hw->scsi_dma_pool = NULL;
502 mempool_destroy(hw->rnode_mempool);
503 hw->rnode_mempool = NULL;
504 mempool_destroy(hw->mb_mempool);
505 hw->mb_mempool = NULL;
506 }
507
508 /*
509 * csio_hw_alloc - Allocate and initialize the HW module.
510 * @pdev: PCI device.
511 *
512 * Allocates HW structure, DMA, memory resources, maps BARS to
513 * host memory and initializes HW module.
514 */
csio_hw_alloc(struct pci_dev * pdev)515 static struct csio_hw *csio_hw_alloc(struct pci_dev *pdev)
516 {
517 struct csio_hw *hw;
518
519 hw = kzalloc(sizeof(struct csio_hw), GFP_KERNEL);
520 if (!hw)
521 goto err;
522
523 hw->pdev = pdev;
524 strncpy(hw->drv_version, CSIO_DRV_VERSION, 32);
525
526 /* memory pool/DMA pool allocation */
527 if (csio_resource_alloc(hw))
528 goto err_free_hw;
529
530 /* Get the start address of registers from BAR 0 */
531 hw->regstart = ioremap(pci_resource_start(pdev, 0),
532 pci_resource_len(pdev, 0));
533 if (!hw->regstart) {
534 csio_err(hw, "Could not map BAR 0, regstart = %p\n",
535 hw->regstart);
536 goto err_resource_free;
537 }
538
539 csio_hw_init_workers(hw);
540
541 if (csio_hw_init(hw))
542 goto err_unmap_bar;
543
544 csio_dfs_create(hw);
545
546 csio_dbg(hw, "hw:%p\n", hw);
547
548 return hw;
549
550 err_unmap_bar:
551 csio_hw_exit_workers(hw);
552 iounmap(hw->regstart);
553 err_resource_free:
554 csio_resource_free(hw);
555 err_free_hw:
556 kfree(hw);
557 err:
558 return NULL;
559 }
560
561 /*
562 * csio_hw_free - Uninitialize and free the HW module.
563 * @hw: The HW module
564 *
565 * Disable interrupts, uninit the HW module, free resources, free hw.
566 */
567 static void
csio_hw_free(struct csio_hw * hw)568 csio_hw_free(struct csio_hw *hw)
569 {
570 csio_intr_disable(hw, true);
571 csio_hw_exit_workers(hw);
572 csio_hw_exit(hw);
573 iounmap(hw->regstart);
574 csio_dfs_destroy(hw);
575 csio_resource_free(hw);
576 kfree(hw);
577 }
578
579 /**
580 * csio_shost_init - Create and initialize the lnode module.
581 * @hw: The HW module.
582 * @dev: The device associated with this invocation.
583 * @probe: Called from probe context or not?
584 * @pln: Parent lnode if any.
585 *
586 * Allocates lnode structure via scsi_host_alloc, initializes
587 * shost, initializes lnode module and registers with SCSI ML
588 * via scsi_host_add. This function is shared between physical and
589 * virtual node ports.
590 */
591 struct csio_lnode *
csio_shost_init(struct csio_hw * hw,struct device * dev,bool probe,struct csio_lnode * pln)592 csio_shost_init(struct csio_hw *hw, struct device *dev,
593 bool probe, struct csio_lnode *pln)
594 {
595 struct Scsi_Host *shost = NULL;
596 struct csio_lnode *ln;
597
598 csio_fcoe_shost_template.cmd_per_lun = csio_lun_qdepth;
599 csio_fcoe_shost_vport_template.cmd_per_lun = csio_lun_qdepth;
600
601 /*
602 * hw->pdev is the physical port's PCI dev structure,
603 * which will be different from the NPIV dev structure.
604 */
605 if (dev == &hw->pdev->dev)
606 shost = scsi_host_alloc(
607 &csio_fcoe_shost_template,
608 sizeof(struct csio_lnode));
609 else
610 shost = scsi_host_alloc(
611 &csio_fcoe_shost_vport_template,
612 sizeof(struct csio_lnode));
613
614 if (!shost)
615 goto err;
616
617 ln = shost_priv(shost);
618 memset(ln, 0, sizeof(struct csio_lnode));
619
620 /* Link common lnode to this lnode */
621 ln->dev_num = (shost->host_no << 16);
622
623 shost->can_queue = CSIO_MAX_QUEUE;
624 shost->this_id = -1;
625 shost->unique_id = shost->host_no;
626 shost->max_cmd_len = 16; /* Max CDB length supported */
627 shost->max_id = min_t(uint32_t, csio_fcoe_rnodes,
628 hw->fres_info.max_ssns);
629 shost->max_lun = CSIO_MAX_LUN;
630 if (dev == &hw->pdev->dev)
631 shost->transportt = csio_fcoe_transport;
632 else
633 shost->transportt = csio_fcoe_transport_vport;
634
635 /* root lnode */
636 if (!hw->rln)
637 hw->rln = ln;
638
639 /* Other initialization here: Common, Transport specific */
640 if (csio_lnode_init(ln, hw, pln))
641 goto err_shost_put;
642
643 if (scsi_add_host_with_dma(shost, dev, &hw->pdev->dev))
644 goto err_lnode_exit;
645
646 return ln;
647
648 err_lnode_exit:
649 csio_lnode_exit(ln);
650 err_shost_put:
651 scsi_host_put(shost);
652 err:
653 return NULL;
654 }
655
656 /**
657 * csio_shost_exit - De-instantiate the shost.
658 * @ln: The lnode module corresponding to the shost.
659 *
660 */
661 void
csio_shost_exit(struct csio_lnode * ln)662 csio_shost_exit(struct csio_lnode *ln)
663 {
664 struct Scsi_Host *shost = csio_ln_to_shost(ln);
665 struct csio_hw *hw = csio_lnode_to_hw(ln);
666
667 /* Inform transport */
668 fc_remove_host(shost);
669
670 /* Inform SCSI ML */
671 scsi_remove_host(shost);
672
673 /* Flush all the events, so that any rnode removal events
674 * already queued are all handled, before we remove the lnode.
675 */
676 spin_lock_irq(&hw->lock);
677 csio_evtq_flush(hw);
678 spin_unlock_irq(&hw->lock);
679
680 csio_lnode_exit(ln);
681 scsi_host_put(shost);
682 }
683
684 struct csio_lnode *
csio_lnode_alloc(struct csio_hw * hw)685 csio_lnode_alloc(struct csio_hw *hw)
686 {
687 return csio_shost_init(hw, &hw->pdev->dev, false, NULL);
688 }
689
690 void
csio_lnodes_block_request(struct csio_hw * hw)691 csio_lnodes_block_request(struct csio_hw *hw)
692 {
693 struct Scsi_Host *shost;
694 struct csio_lnode *sln;
695 struct csio_lnode *ln;
696 struct list_head *cur_ln, *cur_cln;
697 struct csio_lnode **lnode_list;
698 int cur_cnt = 0, ii;
699
700 lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
701 GFP_KERNEL);
702 if (!lnode_list) {
703 csio_err(hw, "Failed to allocate lnodes_list");
704 return;
705 }
706
707 spin_lock_irq(&hw->lock);
708 /* Traverse sibling lnodes */
709 list_for_each(cur_ln, &hw->sln_head) {
710 sln = (struct csio_lnode *) cur_ln;
711 lnode_list[cur_cnt++] = sln;
712
713 /* Traverse children lnodes */
714 list_for_each(cur_cln, &sln->cln_head)
715 lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
716 }
717 spin_unlock_irq(&hw->lock);
718
719 for (ii = 0; ii < cur_cnt; ii++) {
720 csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
721 ln = lnode_list[ii];
722 shost = csio_ln_to_shost(ln);
723 scsi_block_requests(shost);
724
725 }
726 kfree(lnode_list);
727 }
728
729 void
csio_lnodes_unblock_request(struct csio_hw * hw)730 csio_lnodes_unblock_request(struct csio_hw *hw)
731 {
732 struct csio_lnode *ln;
733 struct Scsi_Host *shost;
734 struct csio_lnode *sln;
735 struct list_head *cur_ln, *cur_cln;
736 struct csio_lnode **lnode_list;
737 int cur_cnt = 0, ii;
738
739 lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
740 GFP_KERNEL);
741 if (!lnode_list) {
742 csio_err(hw, "Failed to allocate lnodes_list");
743 return;
744 }
745
746 spin_lock_irq(&hw->lock);
747 /* Traverse sibling lnodes */
748 list_for_each(cur_ln, &hw->sln_head) {
749 sln = (struct csio_lnode *) cur_ln;
750 lnode_list[cur_cnt++] = sln;
751
752 /* Traverse children lnodes */
753 list_for_each(cur_cln, &sln->cln_head)
754 lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
755 }
756 spin_unlock_irq(&hw->lock);
757
758 for (ii = 0; ii < cur_cnt; ii++) {
759 csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
760 ln = lnode_list[ii];
761 shost = csio_ln_to_shost(ln);
762 scsi_unblock_requests(shost);
763 }
764 kfree(lnode_list);
765 }
766
767 void
csio_lnodes_block_by_port(struct csio_hw * hw,uint8_t portid)768 csio_lnodes_block_by_port(struct csio_hw *hw, uint8_t portid)
769 {
770 struct csio_lnode *ln;
771 struct Scsi_Host *shost;
772 struct csio_lnode *sln;
773 struct list_head *cur_ln, *cur_cln;
774 struct csio_lnode **lnode_list;
775 int cur_cnt = 0, ii;
776
777 lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
778 GFP_KERNEL);
779 if (!lnode_list) {
780 csio_err(hw, "Failed to allocate lnodes_list");
781 return;
782 }
783
784 spin_lock_irq(&hw->lock);
785 /* Traverse sibling lnodes */
786 list_for_each(cur_ln, &hw->sln_head) {
787 sln = (struct csio_lnode *) cur_ln;
788 if (sln->portid != portid)
789 continue;
790
791 lnode_list[cur_cnt++] = sln;
792
793 /* Traverse children lnodes */
794 list_for_each(cur_cln, &sln->cln_head)
795 lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
796 }
797 spin_unlock_irq(&hw->lock);
798
799 for (ii = 0; ii < cur_cnt; ii++) {
800 csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
801 ln = lnode_list[ii];
802 shost = csio_ln_to_shost(ln);
803 scsi_block_requests(shost);
804 }
805 kfree(lnode_list);
806 }
807
808 void
csio_lnodes_unblock_by_port(struct csio_hw * hw,uint8_t portid)809 csio_lnodes_unblock_by_port(struct csio_hw *hw, uint8_t portid)
810 {
811 struct csio_lnode *ln;
812 struct Scsi_Host *shost;
813 struct csio_lnode *sln;
814 struct list_head *cur_ln, *cur_cln;
815 struct csio_lnode **lnode_list;
816 int cur_cnt = 0, ii;
817
818 lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
819 GFP_KERNEL);
820 if (!lnode_list) {
821 csio_err(hw, "Failed to allocate lnodes_list");
822 return;
823 }
824
825 spin_lock_irq(&hw->lock);
826 /* Traverse sibling lnodes */
827 list_for_each(cur_ln, &hw->sln_head) {
828 sln = (struct csio_lnode *) cur_ln;
829 if (sln->portid != portid)
830 continue;
831 lnode_list[cur_cnt++] = sln;
832
833 /* Traverse children lnodes */
834 list_for_each(cur_cln, &sln->cln_head)
835 lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
836 }
837 spin_unlock_irq(&hw->lock);
838
839 for (ii = 0; ii < cur_cnt; ii++) {
840 csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
841 ln = lnode_list[ii];
842 shost = csio_ln_to_shost(ln);
843 scsi_unblock_requests(shost);
844 }
845 kfree(lnode_list);
846 }
847
848 void
csio_lnodes_exit(struct csio_hw * hw,bool npiv)849 csio_lnodes_exit(struct csio_hw *hw, bool npiv)
850 {
851 struct csio_lnode *sln;
852 struct csio_lnode *ln;
853 struct list_head *cur_ln, *cur_cln;
854 struct csio_lnode **lnode_list;
855 int cur_cnt = 0, ii;
856
857 lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
858 GFP_KERNEL);
859 if (!lnode_list) {
860 csio_err(hw, "lnodes_exit: Failed to allocate lnodes_list.\n");
861 return;
862 }
863
864 /* Get all child lnodes(NPIV ports) */
865 spin_lock_irq(&hw->lock);
866 list_for_each(cur_ln, &hw->sln_head) {
867 sln = (struct csio_lnode *) cur_ln;
868
869 /* Traverse children lnodes */
870 list_for_each(cur_cln, &sln->cln_head)
871 lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
872 }
873 spin_unlock_irq(&hw->lock);
874
875 /* Delete NPIV lnodes */
876 for (ii = 0; ii < cur_cnt; ii++) {
877 csio_dbg(hw, "Deleting child lnode: %p\n", lnode_list[ii]);
878 ln = lnode_list[ii];
879 fc_vport_terminate(ln->fc_vport);
880 }
881
882 /* Delete only npiv lnodes */
883 if (npiv)
884 goto free_lnodes;
885
886 cur_cnt = 0;
887 /* Get all physical lnodes */
888 spin_lock_irq(&hw->lock);
889 /* Traverse sibling lnodes */
890 list_for_each(cur_ln, &hw->sln_head) {
891 sln = (struct csio_lnode *) cur_ln;
892 lnode_list[cur_cnt++] = sln;
893 }
894 spin_unlock_irq(&hw->lock);
895
896 /* Delete physical lnodes */
897 for (ii = 0; ii < cur_cnt; ii++) {
898 csio_dbg(hw, "Deleting parent lnode: %p\n", lnode_list[ii]);
899 csio_shost_exit(lnode_list[ii]);
900 }
901
902 free_lnodes:
903 kfree(lnode_list);
904 }
905
906 /*
907 * csio_lnode_init_post: Set lnode attributes after starting HW.
908 * @ln: lnode.
909 *
910 */
911 static void
csio_lnode_init_post(struct csio_lnode * ln)912 csio_lnode_init_post(struct csio_lnode *ln)
913 {
914 struct Scsi_Host *shost = csio_ln_to_shost(ln);
915
916 csio_fchost_attr_init(ln);
917
918 scsi_scan_host(shost);
919 }
920
921 /*
922 * csio_probe_one - Instantiate this function.
923 * @pdev: PCI device
924 * @id: Device ID
925 *
926 * This is the .probe() callback of the driver. This function:
927 * - Initializes the PCI function by enabling MMIO, setting bus
928 * mastership and setting DMA mask.
929 * - Allocates HW structure, DMA, memory resources, maps BARS to
930 * host memory and initializes HW module.
931 * - Allocates lnode structure via scsi_host_alloc, initializes
932 * shost, initialized lnode module and registers with SCSI ML
933 * via scsi_host_add.
934 * - Enables interrupts, and starts the chip by kicking off the
935 * HW state machine.
936 * - Once hardware is ready, initiated scan of the host via
937 * scsi_scan_host.
938 */
csio_probe_one(struct pci_dev * pdev,const struct pci_device_id * id)939 static int csio_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
940 {
941 int rv;
942 int bars;
943 int i;
944 struct csio_hw *hw;
945 struct csio_lnode *ln;
946
947 /* probe only T5 and T6 cards */
948 if (!csio_is_t5((pdev->device & CSIO_HW_CHIP_MASK)) &&
949 !csio_is_t6((pdev->device & CSIO_HW_CHIP_MASK)))
950 return -ENODEV;
951
952 rv = csio_pci_init(pdev, &bars);
953 if (rv)
954 goto err;
955
956 hw = csio_hw_alloc(pdev);
957 if (!hw) {
958 rv = -ENODEV;
959 goto err_pci_exit;
960 }
961
962 if (!pcie_relaxed_ordering_enabled(pdev))
963 hw->flags |= CSIO_HWF_ROOT_NO_RELAXED_ORDERING;
964
965 pci_set_drvdata(pdev, hw);
966
967 rv = csio_hw_start(hw);
968 if (rv) {
969 if (rv == -EINVAL) {
970 dev_err(&pdev->dev,
971 "Failed to start FW, continuing in debug mode.\n");
972 return 0;
973 }
974 goto err_lnode_exit;
975 }
976
977 sprintf(hw->fwrev_str, "%u.%u.%u.%u\n",
978 FW_HDR_FW_VER_MAJOR_G(hw->fwrev),
979 FW_HDR_FW_VER_MINOR_G(hw->fwrev),
980 FW_HDR_FW_VER_MICRO_G(hw->fwrev),
981 FW_HDR_FW_VER_BUILD_G(hw->fwrev));
982
983 for (i = 0; i < hw->num_pports; i++) {
984 ln = csio_shost_init(hw, &pdev->dev, true, NULL);
985 if (!ln) {
986 rv = -ENODEV;
987 break;
988 }
989 /* Initialize portid */
990 ln->portid = hw->pport[i].portid;
991
992 spin_lock_irq(&hw->lock);
993 if (csio_lnode_start(ln) != 0)
994 rv = -ENODEV;
995 spin_unlock_irq(&hw->lock);
996
997 if (rv)
998 break;
999
1000 csio_lnode_init_post(ln);
1001 }
1002
1003 if (rv)
1004 goto err_lnode_exit;
1005
1006 return 0;
1007
1008 err_lnode_exit:
1009 csio_lnodes_block_request(hw);
1010 spin_lock_irq(&hw->lock);
1011 csio_hw_stop(hw);
1012 spin_unlock_irq(&hw->lock);
1013 csio_lnodes_unblock_request(hw);
1014 csio_lnodes_exit(hw, 0);
1015 csio_hw_free(hw);
1016 err_pci_exit:
1017 csio_pci_exit(pdev, &bars);
1018 err:
1019 dev_err(&pdev->dev, "probe of device failed: %d\n", rv);
1020 return rv;
1021 }
1022
1023 /*
1024 * csio_remove_one - Remove one instance of the driver at this PCI function.
1025 * @pdev: PCI device
1026 *
1027 * Used during hotplug operation.
1028 */
csio_remove_one(struct pci_dev * pdev)1029 static void csio_remove_one(struct pci_dev *pdev)
1030 {
1031 struct csio_hw *hw = pci_get_drvdata(pdev);
1032 int bars = pci_select_bars(pdev, IORESOURCE_MEM);
1033
1034 csio_lnodes_block_request(hw);
1035 spin_lock_irq(&hw->lock);
1036
1037 /* Stops lnode, Rnode s/m
1038 * Quiesce IOs.
1039 * All sessions with remote ports are unregistered.
1040 */
1041 csio_hw_stop(hw);
1042 spin_unlock_irq(&hw->lock);
1043 csio_lnodes_unblock_request(hw);
1044
1045 csio_lnodes_exit(hw, 0);
1046 csio_hw_free(hw);
1047 csio_pci_exit(pdev, &bars);
1048 }
1049
1050 /*
1051 * csio_pci_error_detected - PCI error was detected
1052 * @pdev: PCI device
1053 *
1054 */
1055 static pci_ers_result_t
csio_pci_error_detected(struct pci_dev * pdev,pci_channel_state_t state)1056 csio_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
1057 {
1058 struct csio_hw *hw = pci_get_drvdata(pdev);
1059
1060 csio_lnodes_block_request(hw);
1061 spin_lock_irq(&hw->lock);
1062
1063 /* Post PCI error detected evt to HW s/m
1064 * HW s/m handles this evt by quiescing IOs, unregisters rports
1065 * and finally takes the device to offline.
1066 */
1067 csio_post_event(&hw->sm, CSIO_HWE_PCIERR_DETECTED);
1068 spin_unlock_irq(&hw->lock);
1069 csio_lnodes_unblock_request(hw);
1070 csio_lnodes_exit(hw, 0);
1071 csio_intr_disable(hw, true);
1072 pci_disable_device(pdev);
1073 return state == pci_channel_io_perm_failure ?
1074 PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
1075 }
1076
1077 /*
1078 * csio_pci_slot_reset - PCI slot has been reset.
1079 * @pdev: PCI device
1080 *
1081 */
1082 static pci_ers_result_t
csio_pci_slot_reset(struct pci_dev * pdev)1083 csio_pci_slot_reset(struct pci_dev *pdev)
1084 {
1085 struct csio_hw *hw = pci_get_drvdata(pdev);
1086 int ready;
1087
1088 if (pci_enable_device(pdev)) {
1089 dev_err(&pdev->dev, "cannot re-enable device in slot reset\n");
1090 return PCI_ERS_RESULT_DISCONNECT;
1091 }
1092
1093 pci_set_master(pdev);
1094 pci_restore_state(pdev);
1095 pci_save_state(pdev);
1096
1097 /* Bring HW s/m to ready state.
1098 * but don't resume IOs.
1099 */
1100 spin_lock_irq(&hw->lock);
1101 csio_post_event(&hw->sm, CSIO_HWE_PCIERR_SLOT_RESET);
1102 ready = csio_is_hw_ready(hw);
1103 spin_unlock_irq(&hw->lock);
1104
1105 if (ready) {
1106 return PCI_ERS_RESULT_RECOVERED;
1107 } else {
1108 dev_err(&pdev->dev, "Can't initialize HW when in slot reset\n");
1109 return PCI_ERS_RESULT_DISCONNECT;
1110 }
1111 }
1112
1113 /*
1114 * csio_pci_resume - Resume normal operations
1115 * @pdev: PCI device
1116 *
1117 */
1118 static void
csio_pci_resume(struct pci_dev * pdev)1119 csio_pci_resume(struct pci_dev *pdev)
1120 {
1121 struct csio_hw *hw = pci_get_drvdata(pdev);
1122 struct csio_lnode *ln;
1123 int rv = 0;
1124 int i;
1125
1126 /* Bring the LINK UP and Resume IO */
1127
1128 for (i = 0; i < hw->num_pports; i++) {
1129 ln = csio_shost_init(hw, &pdev->dev, true, NULL);
1130 if (!ln) {
1131 rv = -ENODEV;
1132 break;
1133 }
1134 /* Initialize portid */
1135 ln->portid = hw->pport[i].portid;
1136
1137 spin_lock_irq(&hw->lock);
1138 if (csio_lnode_start(ln) != 0)
1139 rv = -ENODEV;
1140 spin_unlock_irq(&hw->lock);
1141
1142 if (rv)
1143 break;
1144
1145 csio_lnode_init_post(ln);
1146 }
1147
1148 if (rv)
1149 goto err_resume_exit;
1150
1151 return;
1152
1153 err_resume_exit:
1154 csio_lnodes_block_request(hw);
1155 spin_lock_irq(&hw->lock);
1156 csio_hw_stop(hw);
1157 spin_unlock_irq(&hw->lock);
1158 csio_lnodes_unblock_request(hw);
1159 csio_lnodes_exit(hw, 0);
1160 csio_hw_free(hw);
1161 dev_err(&pdev->dev, "resume of device failed: %d\n", rv);
1162 }
1163
1164 static struct pci_error_handlers csio_err_handler = {
1165 .error_detected = csio_pci_error_detected,
1166 .slot_reset = csio_pci_slot_reset,
1167 .resume = csio_pci_resume,
1168 };
1169
1170 /*
1171 * Macros needed to support the PCI Device ID Table ...
1172 */
1173 #define CH_PCI_DEVICE_ID_TABLE_DEFINE_BEGIN \
1174 static const struct pci_device_id csio_pci_tbl[] = {
1175 /* Define for FCoE uses PF6 */
1176 #define CH_PCI_DEVICE_ID_FUNCTION 0x6
1177
1178 #define CH_PCI_ID_TABLE_ENTRY(devid) \
1179 { PCI_VDEVICE(CHELSIO, (devid)), 0 }
1180
1181 #define CH_PCI_DEVICE_ID_TABLE_DEFINE_END { 0, } }
1182
1183 #include "t4_pci_id_tbl.h"
1184
1185 static struct pci_driver csio_pci_driver = {
1186 .name = KBUILD_MODNAME,
1187 .driver = {
1188 .owner = THIS_MODULE,
1189 },
1190 .id_table = csio_pci_tbl,
1191 .probe = csio_probe_one,
1192 .remove = csio_remove_one,
1193 .err_handler = &csio_err_handler,
1194 };
1195
1196 /*
1197 * csio_init - Chelsio storage driver initialization function.
1198 *
1199 */
1200 static int __init
csio_init(void)1201 csio_init(void)
1202 {
1203 int rv = -ENOMEM;
1204
1205 pr_info("%s %s\n", CSIO_DRV_DESC, CSIO_DRV_VERSION);
1206
1207 csio_dfs_init();
1208
1209 csio_fcoe_transport = fc_attach_transport(&csio_fc_transport_funcs);
1210 if (!csio_fcoe_transport)
1211 goto err;
1212
1213 csio_fcoe_transport_vport =
1214 fc_attach_transport(&csio_fc_transport_vport_funcs);
1215 if (!csio_fcoe_transport_vport)
1216 goto err_vport;
1217
1218 rv = pci_register_driver(&csio_pci_driver);
1219 if (rv)
1220 goto err_pci;
1221
1222 return 0;
1223
1224 err_pci:
1225 fc_release_transport(csio_fcoe_transport_vport);
1226 err_vport:
1227 fc_release_transport(csio_fcoe_transport);
1228 err:
1229 csio_dfs_exit();
1230 return rv;
1231 }
1232
1233 /*
1234 * csio_exit - Chelsio storage driver uninitialization .
1235 *
1236 * Function that gets called in the unload path.
1237 */
1238 static void __exit
csio_exit(void)1239 csio_exit(void)
1240 {
1241 pci_unregister_driver(&csio_pci_driver);
1242 csio_dfs_exit();
1243 fc_release_transport(csio_fcoe_transport_vport);
1244 fc_release_transport(csio_fcoe_transport);
1245 }
1246
1247 module_init(csio_init);
1248 module_exit(csio_exit);
1249 MODULE_AUTHOR(CSIO_DRV_AUTHOR);
1250 MODULE_DESCRIPTION(CSIO_DRV_DESC);
1251 MODULE_LICENSE("Dual BSD/GPL");
1252 MODULE_DEVICE_TABLE(pci, csio_pci_tbl);
1253 MODULE_VERSION(CSIO_DRV_VERSION);
1254 MODULE_FIRMWARE(FW_FNAME_T5);
1255 MODULE_FIRMWARE(FW_FNAME_T6);
1256 MODULE_SOFTDEP("pre: cxgb4");
1257