xref: /linux/drivers/scsi/csiostor/csio_init.c (revision 24168c5e6dfbdd5b414f048f47f75d64533296ca)
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
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 
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 
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
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
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
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
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
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
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
244 csio_hw_init_workers(struct csio_hw *hw)
245 {
246 	INIT_WORK(&hw->evtq_work, csio_evtq_worker);
247 }
248 
249 static void
250 csio_hw_exit_workers(struct csio_hw *hw)
251 {
252 	cancel_work_sync(&hw->evtq_work);
253 }
254 
255 static int
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
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
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
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  */
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 	strscpy(hw->drv_version, CSIO_DRV_VERSION,
525 		sizeof(hw->drv_version));
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  * @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 	.id_table	= csio_pci_tbl,
1189 	.probe		= csio_probe_one,
1190 	.remove		= csio_remove_one,
1191 	.err_handler	= &csio_err_handler,
1192 };
1193 
1194 /*
1195  * csio_init - Chelsio storage driver initialization function.
1196  *
1197  */
1198 static int __init
1199 csio_init(void)
1200 {
1201 	int rv = -ENOMEM;
1202 
1203 	pr_info("%s %s\n", CSIO_DRV_DESC, CSIO_DRV_VERSION);
1204 
1205 	csio_dfs_init();
1206 
1207 	csio_fcoe_transport = fc_attach_transport(&csio_fc_transport_funcs);
1208 	if (!csio_fcoe_transport)
1209 		goto err;
1210 
1211 	csio_fcoe_transport_vport =
1212 			fc_attach_transport(&csio_fc_transport_vport_funcs);
1213 	if (!csio_fcoe_transport_vport)
1214 		goto err_vport;
1215 
1216 	rv = pci_register_driver(&csio_pci_driver);
1217 	if (rv)
1218 		goto err_pci;
1219 
1220 	return 0;
1221 
1222 err_pci:
1223 	fc_release_transport(csio_fcoe_transport_vport);
1224 err_vport:
1225 	fc_release_transport(csio_fcoe_transport);
1226 err:
1227 	csio_dfs_exit();
1228 	return rv;
1229 }
1230 
1231 /*
1232  * csio_exit - Chelsio storage driver uninitialization .
1233  *
1234  * Function that gets called in the unload path.
1235  */
1236 static void __exit
1237 csio_exit(void)
1238 {
1239 	pci_unregister_driver(&csio_pci_driver);
1240 	csio_dfs_exit();
1241 	fc_release_transport(csio_fcoe_transport_vport);
1242 	fc_release_transport(csio_fcoe_transport);
1243 }
1244 
1245 module_init(csio_init);
1246 module_exit(csio_exit);
1247 MODULE_AUTHOR(CSIO_DRV_AUTHOR);
1248 MODULE_DESCRIPTION(CSIO_DRV_DESC);
1249 MODULE_LICENSE("Dual BSD/GPL");
1250 MODULE_DEVICE_TABLE(pci, csio_pci_tbl);
1251 MODULE_VERSION(CSIO_DRV_VERSION);
1252 MODULE_FIRMWARE(FW_FNAME_T5);
1253 MODULE_FIRMWARE(FW_FNAME_T6);
1254 MODULE_SOFTDEP("pre: cxgb4");
1255