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1 /*******************************************************************
2  * This file is part of the Emulex Linux Device Driver for         *
3  * Fibre Channel Host Bus Adapters.                                *
4  * Copyright (C) 2004-2012 Emulex.  All rights reserved.           *
5  * EMULEX and SLI are trademarks of Emulex.                        *
6  * www.emulex.com                                                  *
7  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
8  *                                                                 *
9  * This program is free software; you can redistribute it and/or   *
10  * modify it under the terms of version 2 of the GNU General       *
11  * Public License as published by the Free Software Foundation.    *
12  * This program is distributed in the hope that it will be useful. *
13  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
14  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
15  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
16  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
17  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
18  * more details, a copy of which can be found in the file COPYING  *
19  * included with this package.                                     *
20  *******************************************************************/
21 
22 #include <linux/mempool.h>
23 #include <linux/slab.h>
24 #include <linux/pci.h>
25 #include <linux/interrupt.h>
26 
27 #include <scsi/scsi_device.h>
28 #include <scsi/scsi_transport_fc.h>
29 
30 #include <scsi/scsi.h>
31 
32 #include "lpfc_hw4.h"
33 #include "lpfc_hw.h"
34 #include "lpfc_sli.h"
35 #include "lpfc_sli4.h"
36 #include "lpfc_nl.h"
37 #include "lpfc_disc.h"
38 #include "lpfc_scsi.h"
39 #include "lpfc.h"
40 #include "lpfc_crtn.h"
41 
42 #define LPFC_MBUF_POOL_SIZE     64      /* max elements in MBUF safety pool */
43 #define LPFC_MEM_POOL_SIZE      64      /* max elem in non-DMA safety pool */
44 
45 
46 /**
47  * lpfc_mem_alloc - create and allocate all PCI and memory pools
48  * @phba: HBA to allocate pools for
49  *
50  * Description: Creates and allocates PCI pools lpfc_scsi_dma_buf_pool,
51  * lpfc_mbuf_pool, lpfc_hrb_pool.  Creates and allocates kmalloc-backed mempools
52  * for LPFC_MBOXQ_t and lpfc_nodelist.  Also allocates the VPI bitmask.
53  *
54  * Notes: Not interrupt-safe.  Must be called with no locks held.  If any
55  * allocation fails, frees all successfully allocated memory before returning.
56  *
57  * Returns:
58  *   0 on success
59  *   -ENOMEM on failure (if any memory allocations fail)
60  **/
61 int
lpfc_mem_alloc(struct lpfc_hba * phba,int align)62 lpfc_mem_alloc(struct lpfc_hba *phba, int align)
63 {
64 	struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
65 	int i;
66 
67 	if (phba->sli_rev == LPFC_SLI_REV4) {
68 		/* Calculate alignment */
69 		if (phba->cfg_sg_dma_buf_size < SLI4_PAGE_SIZE)
70 			i = phba->cfg_sg_dma_buf_size;
71 		else
72 			i = SLI4_PAGE_SIZE;
73 
74 		phba->lpfc_scsi_dma_buf_pool =
75 			pci_pool_create("lpfc_scsi_dma_buf_pool",
76 				phba->pcidev,
77 				phba->cfg_sg_dma_buf_size,
78 				i,
79 				0);
80 	} else {
81 		phba->lpfc_scsi_dma_buf_pool =
82 			pci_pool_create("lpfc_scsi_dma_buf_pool",
83 				phba->pcidev, phba->cfg_sg_dma_buf_size,
84 				align, 0);
85 	}
86 
87 	if (!phba->lpfc_scsi_dma_buf_pool)
88 		goto fail;
89 
90 	phba->lpfc_mbuf_pool = pci_pool_create("lpfc_mbuf_pool", phba->pcidev,
91 							LPFC_BPL_SIZE,
92 							align, 0);
93 	if (!phba->lpfc_mbuf_pool)
94 		goto fail_free_dma_buf_pool;
95 
96 	pool->elements = kmalloc(sizeof(struct lpfc_dmabuf) *
97 					 LPFC_MBUF_POOL_SIZE, GFP_KERNEL);
98 	if (!pool->elements)
99 		goto fail_free_lpfc_mbuf_pool;
100 
101 	pool->max_count = 0;
102 	pool->current_count = 0;
103 	for ( i = 0; i < LPFC_MBUF_POOL_SIZE; i++) {
104 		pool->elements[i].virt = pci_pool_alloc(phba->lpfc_mbuf_pool,
105 				       GFP_KERNEL, &pool->elements[i].phys);
106 		if (!pool->elements[i].virt)
107 			goto fail_free_mbuf_pool;
108 		pool->max_count++;
109 		pool->current_count++;
110 	}
111 
112 	phba->mbox_mem_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
113 							 sizeof(LPFC_MBOXQ_t));
114 	if (!phba->mbox_mem_pool)
115 		goto fail_free_mbuf_pool;
116 
117 	phba->nlp_mem_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
118 						sizeof(struct lpfc_nodelist));
119 	if (!phba->nlp_mem_pool)
120 		goto fail_free_mbox_pool;
121 
122 	if (phba->sli_rev == LPFC_SLI_REV4) {
123 		phba->rrq_pool =
124 			mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
125 						sizeof(struct lpfc_node_rrq));
126 		if (!phba->rrq_pool)
127 			goto fail_free_nlp_mem_pool;
128 		phba->lpfc_hrb_pool = pci_pool_create("lpfc_hrb_pool",
129 					      phba->pcidev,
130 					      LPFC_HDR_BUF_SIZE, align, 0);
131 		if (!phba->lpfc_hrb_pool)
132 			goto fail_free_rrq_mem_pool;
133 
134 		phba->lpfc_drb_pool = pci_pool_create("lpfc_drb_pool",
135 					      phba->pcidev,
136 					      LPFC_DATA_BUF_SIZE, align, 0);
137 		if (!phba->lpfc_drb_pool)
138 			goto fail_free_hrb_pool;
139 		phba->lpfc_hbq_pool = NULL;
140 	} else {
141 		phba->lpfc_hbq_pool = pci_pool_create("lpfc_hbq_pool",
142 			phba->pcidev, LPFC_BPL_SIZE, align, 0);
143 		if (!phba->lpfc_hbq_pool)
144 			goto fail_free_nlp_mem_pool;
145 		phba->lpfc_hrb_pool = NULL;
146 		phba->lpfc_drb_pool = NULL;
147 	}
148 
149 	return 0;
150  fail_free_hrb_pool:
151 	pci_pool_destroy(phba->lpfc_hrb_pool);
152 	phba->lpfc_hrb_pool = NULL;
153  fail_free_rrq_mem_pool:
154 	mempool_destroy(phba->rrq_pool);
155 	phba->rrq_pool = NULL;
156  fail_free_nlp_mem_pool:
157 	mempool_destroy(phba->nlp_mem_pool);
158 	phba->nlp_mem_pool = NULL;
159  fail_free_mbox_pool:
160 	mempool_destroy(phba->mbox_mem_pool);
161 	phba->mbox_mem_pool = NULL;
162  fail_free_mbuf_pool:
163 	while (i--)
164 		pci_pool_free(phba->lpfc_mbuf_pool, pool->elements[i].virt,
165 						 pool->elements[i].phys);
166 	kfree(pool->elements);
167  fail_free_lpfc_mbuf_pool:
168 	pci_pool_destroy(phba->lpfc_mbuf_pool);
169 	phba->lpfc_mbuf_pool = NULL;
170  fail_free_dma_buf_pool:
171 	pci_pool_destroy(phba->lpfc_scsi_dma_buf_pool);
172 	phba->lpfc_scsi_dma_buf_pool = NULL;
173  fail:
174 	return -ENOMEM;
175 }
176 
177 /**
178  * lpfc_mem_free - Frees memory allocated by lpfc_mem_alloc
179  * @phba: HBA to free memory for
180  *
181  * Description: Free the memory allocated by lpfc_mem_alloc routine. This
182  * routine is a the counterpart of lpfc_mem_alloc.
183  *
184  * Returns: None
185  **/
186 void
lpfc_mem_free(struct lpfc_hba * phba)187 lpfc_mem_free(struct lpfc_hba *phba)
188 {
189 	int i;
190 	struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
191 
192 	/* Free HBQ pools */
193 	lpfc_sli_hbqbuf_free_all(phba);
194 	if (phba->lpfc_drb_pool)
195 		pci_pool_destroy(phba->lpfc_drb_pool);
196 	phba->lpfc_drb_pool = NULL;
197 	if (phba->lpfc_hrb_pool)
198 		pci_pool_destroy(phba->lpfc_hrb_pool);
199 	phba->lpfc_hrb_pool = NULL;
200 
201 	if (phba->lpfc_hbq_pool)
202 		pci_pool_destroy(phba->lpfc_hbq_pool);
203 	phba->lpfc_hbq_pool = NULL;
204 
205 	if (phba->rrq_pool)
206 		mempool_destroy(phba->rrq_pool);
207 	phba->rrq_pool = NULL;
208 
209 	/* Free NLP memory pool */
210 	mempool_destroy(phba->nlp_mem_pool);
211 	phba->nlp_mem_pool = NULL;
212 
213 	/* Free mbox memory pool */
214 	mempool_destroy(phba->mbox_mem_pool);
215 	phba->mbox_mem_pool = NULL;
216 
217 	/* Free MBUF memory pool */
218 	for (i = 0; i < pool->current_count; i++)
219 		pci_pool_free(phba->lpfc_mbuf_pool, pool->elements[i].virt,
220 			      pool->elements[i].phys);
221 	kfree(pool->elements);
222 
223 	pci_pool_destroy(phba->lpfc_mbuf_pool);
224 	phba->lpfc_mbuf_pool = NULL;
225 
226 	/* Free DMA buffer memory pool */
227 	pci_pool_destroy(phba->lpfc_scsi_dma_buf_pool);
228 	phba->lpfc_scsi_dma_buf_pool = NULL;
229 
230 	return;
231 }
232 
233 /**
234  * lpfc_mem_free_all - Frees all PCI and driver memory
235  * @phba: HBA to free memory for
236  *
237  * Description: Free memory from PCI and driver memory pools and also those
238  * used : lpfc_scsi_dma_buf_pool, lpfc_mbuf_pool, lpfc_hrb_pool. Frees
239  * kmalloc-backed mempools for LPFC_MBOXQ_t and lpfc_nodelist. Also frees
240  * the VPI bitmask.
241  *
242  * Returns: None
243  **/
244 void
lpfc_mem_free_all(struct lpfc_hba * phba)245 lpfc_mem_free_all(struct lpfc_hba *phba)
246 {
247 	struct lpfc_sli *psli = &phba->sli;
248 	LPFC_MBOXQ_t *mbox, *next_mbox;
249 	struct lpfc_dmabuf   *mp;
250 
251 	/* Free memory used in mailbox queue back to mailbox memory pool */
252 	list_for_each_entry_safe(mbox, next_mbox, &psli->mboxq, list) {
253 		mp = (struct lpfc_dmabuf *) (mbox->context1);
254 		if (mp) {
255 			lpfc_mbuf_free(phba, mp->virt, mp->phys);
256 			kfree(mp);
257 		}
258 		list_del(&mbox->list);
259 		mempool_free(mbox, phba->mbox_mem_pool);
260 	}
261 	/* Free memory used in mailbox cmpl list back to mailbox memory pool */
262 	list_for_each_entry_safe(mbox, next_mbox, &psli->mboxq_cmpl, list) {
263 		mp = (struct lpfc_dmabuf *) (mbox->context1);
264 		if (mp) {
265 			lpfc_mbuf_free(phba, mp->virt, mp->phys);
266 			kfree(mp);
267 		}
268 		list_del(&mbox->list);
269 		mempool_free(mbox, phba->mbox_mem_pool);
270 	}
271 	/* Free the active mailbox command back to the mailbox memory pool */
272 	spin_lock_irq(&phba->hbalock);
273 	psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
274 	spin_unlock_irq(&phba->hbalock);
275 	if (psli->mbox_active) {
276 		mbox = psli->mbox_active;
277 		mp = (struct lpfc_dmabuf *) (mbox->context1);
278 		if (mp) {
279 			lpfc_mbuf_free(phba, mp->virt, mp->phys);
280 			kfree(mp);
281 		}
282 		mempool_free(mbox, phba->mbox_mem_pool);
283 		psli->mbox_active = NULL;
284 	}
285 
286 	/* Free and destroy all the allocated memory pools */
287 	lpfc_mem_free(phba);
288 
289 	/* Free the iocb lookup array */
290 	kfree(psli->iocbq_lookup);
291 	psli->iocbq_lookup = NULL;
292 
293 	return;
294 }
295 
296 /**
297  * lpfc_mbuf_alloc - Allocate an mbuf from the lpfc_mbuf_pool PCI pool
298  * @phba: HBA which owns the pool to allocate from
299  * @mem_flags: indicates if this is a priority (MEM_PRI) allocation
300  * @handle: used to return the DMA-mapped address of the mbuf
301  *
302  * Description: Allocates a DMA-mapped buffer from the lpfc_mbuf_pool PCI pool.
303  * Allocates from generic pci_pool_alloc function first and if that fails and
304  * mem_flags has MEM_PRI set (the only defined flag), returns an mbuf from the
305  * HBA's pool.
306  *
307  * Notes: Not interrupt-safe.  Must be called with no locks held.  Takes
308  * phba->hbalock.
309  *
310  * Returns:
311  *   pointer to the allocated mbuf on success
312  *   NULL on failure
313  **/
314 void *
lpfc_mbuf_alloc(struct lpfc_hba * phba,int mem_flags,dma_addr_t * handle)315 lpfc_mbuf_alloc(struct lpfc_hba *phba, int mem_flags, dma_addr_t *handle)
316 {
317 	struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
318 	unsigned long iflags;
319 	void *ret;
320 
321 	ret = pci_pool_alloc(phba->lpfc_mbuf_pool, GFP_KERNEL, handle);
322 
323 	spin_lock_irqsave(&phba->hbalock, iflags);
324 	if (!ret && (mem_flags & MEM_PRI) && pool->current_count) {
325 		pool->current_count--;
326 		ret = pool->elements[pool->current_count].virt;
327 		*handle = pool->elements[pool->current_count].phys;
328 	}
329 	spin_unlock_irqrestore(&phba->hbalock, iflags);
330 	return ret;
331 }
332 
333 /**
334  * __lpfc_mbuf_free - Free an mbuf from the lpfc_mbuf_pool PCI pool (locked)
335  * @phba: HBA which owns the pool to return to
336  * @virt: mbuf to free
337  * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
338  *
339  * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
340  * it is below its max_count, frees the mbuf otherwise.
341  *
342  * Notes: Must be called with phba->hbalock held to synchronize access to
343  * lpfc_mbuf_safety_pool.
344  *
345  * Returns: None
346  **/
347 void
__lpfc_mbuf_free(struct lpfc_hba * phba,void * virt,dma_addr_t dma)348 __lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
349 {
350 	struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
351 
352 	if (pool->current_count < pool->max_count) {
353 		pool->elements[pool->current_count].virt = virt;
354 		pool->elements[pool->current_count].phys = dma;
355 		pool->current_count++;
356 	} else {
357 		pci_pool_free(phba->lpfc_mbuf_pool, virt, dma);
358 	}
359 	return;
360 }
361 
362 /**
363  * lpfc_mbuf_free - Free an mbuf from the lpfc_mbuf_pool PCI pool (unlocked)
364  * @phba: HBA which owns the pool to return to
365  * @virt: mbuf to free
366  * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
367  *
368  * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
369  * it is below its max_count, frees the mbuf otherwise.
370  *
371  * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
372  *
373  * Returns: None
374  **/
375 void
lpfc_mbuf_free(struct lpfc_hba * phba,void * virt,dma_addr_t dma)376 lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
377 {
378 	unsigned long iflags;
379 
380 	spin_lock_irqsave(&phba->hbalock, iflags);
381 	__lpfc_mbuf_free(phba, virt, dma);
382 	spin_unlock_irqrestore(&phba->hbalock, iflags);
383 	return;
384 }
385 
386 /**
387  * lpfc_els_hbq_alloc - Allocate an HBQ buffer
388  * @phba: HBA to allocate HBQ buffer for
389  *
390  * Description: Allocates a DMA-mapped HBQ buffer from the lpfc_hrb_pool PCI
391  * pool along a non-DMA-mapped container for it.
392  *
393  * Notes: Not interrupt-safe.  Must be called with no locks held.
394  *
395  * Returns:
396  *   pointer to HBQ on success
397  *   NULL on failure
398  **/
399 struct hbq_dmabuf *
lpfc_els_hbq_alloc(struct lpfc_hba * phba)400 lpfc_els_hbq_alloc(struct lpfc_hba *phba)
401 {
402 	struct hbq_dmabuf *hbqbp;
403 
404 	hbqbp = kzalloc(sizeof(struct hbq_dmabuf), GFP_KERNEL);
405 	if (!hbqbp)
406 		return NULL;
407 
408 	hbqbp->dbuf.virt = pci_pool_alloc(phba->lpfc_hbq_pool, GFP_KERNEL,
409 					  &hbqbp->dbuf.phys);
410 	if (!hbqbp->dbuf.virt) {
411 		kfree(hbqbp);
412 		return NULL;
413 	}
414 	hbqbp->size = LPFC_BPL_SIZE;
415 	return hbqbp;
416 }
417 
418 /**
419  * lpfc_els_hbq_free - Frees an HBQ buffer allocated with lpfc_els_hbq_alloc
420  * @phba: HBA buffer was allocated for
421  * @hbqbp: HBQ container returned by lpfc_els_hbq_alloc
422  *
423  * Description: Frees both the container and the DMA-mapped buffer returned by
424  * lpfc_els_hbq_alloc.
425  *
426  * Notes: Can be called with or without locks held.
427  *
428  * Returns: None
429  **/
430 void
lpfc_els_hbq_free(struct lpfc_hba * phba,struct hbq_dmabuf * hbqbp)431 lpfc_els_hbq_free(struct lpfc_hba *phba, struct hbq_dmabuf *hbqbp)
432 {
433 	pci_pool_free(phba->lpfc_hbq_pool, hbqbp->dbuf.virt, hbqbp->dbuf.phys);
434 	kfree(hbqbp);
435 	return;
436 }
437 
438 /**
439  * lpfc_sli4_rb_alloc - Allocate an SLI4 Receive buffer
440  * @phba: HBA to allocate a receive buffer for
441  *
442  * Description: Allocates a DMA-mapped receive buffer from the lpfc_hrb_pool PCI
443  * pool along a non-DMA-mapped container for it.
444  *
445  * Notes: Not interrupt-safe.  Must be called with no locks held.
446  *
447  * Returns:
448  *   pointer to HBQ on success
449  *   NULL on failure
450  **/
451 struct hbq_dmabuf *
lpfc_sli4_rb_alloc(struct lpfc_hba * phba)452 lpfc_sli4_rb_alloc(struct lpfc_hba *phba)
453 {
454 	struct hbq_dmabuf *dma_buf;
455 
456 	dma_buf = kzalloc(sizeof(struct hbq_dmabuf), GFP_KERNEL);
457 	if (!dma_buf)
458 		return NULL;
459 
460 	dma_buf->hbuf.virt = pci_pool_alloc(phba->lpfc_hrb_pool, GFP_KERNEL,
461 					    &dma_buf->hbuf.phys);
462 	if (!dma_buf->hbuf.virt) {
463 		kfree(dma_buf);
464 		return NULL;
465 	}
466 	dma_buf->dbuf.virt = pci_pool_alloc(phba->lpfc_drb_pool, GFP_KERNEL,
467 					    &dma_buf->dbuf.phys);
468 	if (!dma_buf->dbuf.virt) {
469 		pci_pool_free(phba->lpfc_hrb_pool, dma_buf->hbuf.virt,
470 			      dma_buf->hbuf.phys);
471 		kfree(dma_buf);
472 		return NULL;
473 	}
474 	dma_buf->size = LPFC_BPL_SIZE;
475 	return dma_buf;
476 }
477 
478 /**
479  * lpfc_sli4_rb_free - Frees a receive buffer
480  * @phba: HBA buffer was allocated for
481  * @dmab: DMA Buffer container returned by lpfc_sli4_hbq_alloc
482  *
483  * Description: Frees both the container and the DMA-mapped buffers returned by
484  * lpfc_sli4_rb_alloc.
485  *
486  * Notes: Can be called with or without locks held.
487  *
488  * Returns: None
489  **/
490 void
lpfc_sli4_rb_free(struct lpfc_hba * phba,struct hbq_dmabuf * dmab)491 lpfc_sli4_rb_free(struct lpfc_hba *phba, struct hbq_dmabuf *dmab)
492 {
493 	pci_pool_free(phba->lpfc_hrb_pool, dmab->hbuf.virt, dmab->hbuf.phys);
494 	pci_pool_free(phba->lpfc_drb_pool, dmab->dbuf.virt, dmab->dbuf.phys);
495 	kfree(dmab);
496 	return;
497 }
498 
499 /**
500  * lpfc_in_buf_free - Free a DMA buffer
501  * @phba: HBA buffer is associated with
502  * @mp: Buffer to free
503  *
504  * Description: Frees the given DMA buffer in the appropriate way given if the
505  * HBA is running in SLI3 mode with HBQs enabled.
506  *
507  * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
508  *
509  * Returns: None
510  **/
511 void
lpfc_in_buf_free(struct lpfc_hba * phba,struct lpfc_dmabuf * mp)512 lpfc_in_buf_free(struct lpfc_hba *phba, struct lpfc_dmabuf *mp)
513 {
514 	struct hbq_dmabuf *hbq_entry;
515 	unsigned long flags;
516 
517 	if (!mp)
518 		return;
519 
520 	if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
521 		/* Check whether HBQ is still in use */
522 		spin_lock_irqsave(&phba->hbalock, flags);
523 		if (!phba->hbq_in_use) {
524 			spin_unlock_irqrestore(&phba->hbalock, flags);
525 			return;
526 		}
527 		hbq_entry = container_of(mp, struct hbq_dmabuf, dbuf);
528 		list_del(&hbq_entry->dbuf.list);
529 		if (hbq_entry->tag == -1) {
530 			(phba->hbqs[LPFC_ELS_HBQ].hbq_free_buffer)
531 				(phba, hbq_entry);
532 		} else {
533 			lpfc_sli_free_hbq(phba, hbq_entry);
534 		}
535 		spin_unlock_irqrestore(&phba->hbalock, flags);
536 	} else {
537 		lpfc_mbuf_free(phba, mp->virt, mp->phys);
538 		kfree(mp);
539 	}
540 	return;
541 }
542