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