xref: /linux/drivers/net/ethernet/mellanox/mlx4/eq.c (revision f2ee442115c9b6219083c019939a9cc0c9abb2f8)
1 /*
2  * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
3  * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *	- Redistributions of source code must retain the above
16  *	  copyright notice, this list of conditions and the following
17  *	  disclaimer.
18  *
19  *	- Redistributions in binary form must reproduce the above
20  *	  copyright notice, this list of conditions and the following
21  *	  disclaimer in the documentation and/or other materials
22  *	  provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33 
34 #include <linux/interrupt.h>
35 #include <linux/slab.h>
36 #include <linux/export.h>
37 #include <linux/mm.h>
38 #include <linux/dma-mapping.h>
39 
40 #include <linux/mlx4/cmd.h>
41 
42 #include "mlx4.h"
43 #include "fw.h"
44 
45 enum {
46 	MLX4_IRQNAME_SIZE	= 32
47 };
48 
49 enum {
50 	MLX4_NUM_ASYNC_EQE	= 0x100,
51 	MLX4_NUM_SPARE_EQE	= 0x80,
52 	MLX4_EQ_ENTRY_SIZE	= 0x20
53 };
54 
55 /*
56  * Must be packed because start is 64 bits but only aligned to 32 bits.
57  */
58 struct mlx4_eq_context {
59 	__be32			flags;
60 	u16			reserved1[3];
61 	__be16			page_offset;
62 	u8			log_eq_size;
63 	u8			reserved2[4];
64 	u8			eq_period;
65 	u8			reserved3;
66 	u8			eq_max_count;
67 	u8			reserved4[3];
68 	u8			intr;
69 	u8			log_page_size;
70 	u8			reserved5[2];
71 	u8			mtt_base_addr_h;
72 	__be32			mtt_base_addr_l;
73 	u32			reserved6[2];
74 	__be32			consumer_index;
75 	__be32			producer_index;
76 	u32			reserved7[4];
77 };
78 
79 #define MLX4_EQ_STATUS_OK	   ( 0 << 28)
80 #define MLX4_EQ_STATUS_WRITE_FAIL  (10 << 28)
81 #define MLX4_EQ_OWNER_SW	   ( 0 << 24)
82 #define MLX4_EQ_OWNER_HW	   ( 1 << 24)
83 #define MLX4_EQ_FLAG_EC		   ( 1 << 18)
84 #define MLX4_EQ_FLAG_OI		   ( 1 << 17)
85 #define MLX4_EQ_STATE_ARMED	   ( 9 <<  8)
86 #define MLX4_EQ_STATE_FIRED	   (10 <<  8)
87 #define MLX4_EQ_STATE_ALWAYS_ARMED (11 <<  8)
88 
89 #define MLX4_ASYNC_EVENT_MASK ((1ull << MLX4_EVENT_TYPE_PATH_MIG)	    | \
90 			       (1ull << MLX4_EVENT_TYPE_COMM_EST)	    | \
91 			       (1ull << MLX4_EVENT_TYPE_SQ_DRAINED)	    | \
92 			       (1ull << MLX4_EVENT_TYPE_CQ_ERROR)	    | \
93 			       (1ull << MLX4_EVENT_TYPE_WQ_CATAS_ERROR)	    | \
94 			       (1ull << MLX4_EVENT_TYPE_EEC_CATAS_ERROR)    | \
95 			       (1ull << MLX4_EVENT_TYPE_PATH_MIG_FAILED)    | \
96 			       (1ull << MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR) | \
97 			       (1ull << MLX4_EVENT_TYPE_WQ_ACCESS_ERROR)    | \
98 			       (1ull << MLX4_EVENT_TYPE_PORT_CHANGE)	    | \
99 			       (1ull << MLX4_EVENT_TYPE_ECC_DETECT)	    | \
100 			       (1ull << MLX4_EVENT_TYPE_SRQ_CATAS_ERROR)    | \
101 			       (1ull << MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE)    | \
102 			       (1ull << MLX4_EVENT_TYPE_SRQ_LIMIT)	    | \
103 			       (1ull << MLX4_EVENT_TYPE_CMD))
104 
105 struct mlx4_eqe {
106 	u8			reserved1;
107 	u8			type;
108 	u8			reserved2;
109 	u8			subtype;
110 	union {
111 		u32		raw[6];
112 		struct {
113 			__be32	cqn;
114 		} __packed comp;
115 		struct {
116 			u16	reserved1;
117 			__be16	token;
118 			u32	reserved2;
119 			u8	reserved3[3];
120 			u8	status;
121 			__be64	out_param;
122 		} __packed cmd;
123 		struct {
124 			__be32	qpn;
125 		} __packed qp;
126 		struct {
127 			__be32	srqn;
128 		} __packed srq;
129 		struct {
130 			__be32	cqn;
131 			u32	reserved1;
132 			u8	reserved2[3];
133 			u8	syndrome;
134 		} __packed cq_err;
135 		struct {
136 			u32	reserved1[2];
137 			__be32	port;
138 		} __packed port_change;
139 	}			event;
140 	u8			reserved3[3];
141 	u8			owner;
142 } __packed;
143 
144 static void eq_set_ci(struct mlx4_eq *eq, int req_not)
145 {
146 	__raw_writel((__force u32) cpu_to_be32((eq->cons_index & 0xffffff) |
147 					       req_not << 31),
148 		     eq->doorbell);
149 	/* We still want ordering, just not swabbing, so add a barrier */
150 	mb();
151 }
152 
153 static struct mlx4_eqe *get_eqe(struct mlx4_eq *eq, u32 entry)
154 {
155 	unsigned long off = (entry & (eq->nent - 1)) * MLX4_EQ_ENTRY_SIZE;
156 	return eq->page_list[off / PAGE_SIZE].buf + off % PAGE_SIZE;
157 }
158 
159 static struct mlx4_eqe *next_eqe_sw(struct mlx4_eq *eq)
160 {
161 	struct mlx4_eqe *eqe = get_eqe(eq, eq->cons_index);
162 	return !!(eqe->owner & 0x80) ^ !!(eq->cons_index & eq->nent) ? NULL : eqe;
163 }
164 
165 static int mlx4_eq_int(struct mlx4_dev *dev, struct mlx4_eq *eq)
166 {
167 	struct mlx4_eqe *eqe;
168 	int cqn;
169 	int eqes_found = 0;
170 	int set_ci = 0;
171 	int port;
172 
173 	while ((eqe = next_eqe_sw(eq))) {
174 		/*
175 		 * Make sure we read EQ entry contents after we've
176 		 * checked the ownership bit.
177 		 */
178 		rmb();
179 
180 		switch (eqe->type) {
181 		case MLX4_EVENT_TYPE_COMP:
182 			cqn = be32_to_cpu(eqe->event.comp.cqn) & 0xffffff;
183 			mlx4_cq_completion(dev, cqn);
184 			break;
185 
186 		case MLX4_EVENT_TYPE_PATH_MIG:
187 		case MLX4_EVENT_TYPE_COMM_EST:
188 		case MLX4_EVENT_TYPE_SQ_DRAINED:
189 		case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
190 		case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
191 		case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
192 		case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
193 		case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
194 			mlx4_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
195 				      eqe->type);
196 			break;
197 
198 		case MLX4_EVENT_TYPE_SRQ_LIMIT:
199 		case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
200 			mlx4_srq_event(dev, be32_to_cpu(eqe->event.srq.srqn) & 0xffffff,
201 				      eqe->type);
202 			break;
203 
204 		case MLX4_EVENT_TYPE_CMD:
205 			mlx4_cmd_event(dev,
206 				       be16_to_cpu(eqe->event.cmd.token),
207 				       eqe->event.cmd.status,
208 				       be64_to_cpu(eqe->event.cmd.out_param));
209 			break;
210 
211 		case MLX4_EVENT_TYPE_PORT_CHANGE:
212 			port = be32_to_cpu(eqe->event.port_change.port) >> 28;
213 			if (eqe->subtype == MLX4_PORT_CHANGE_SUBTYPE_DOWN) {
214 				mlx4_dispatch_event(dev, MLX4_DEV_EVENT_PORT_DOWN,
215 						    port);
216 				mlx4_priv(dev)->sense.do_sense_port[port] = 1;
217 			} else {
218 				mlx4_dispatch_event(dev, MLX4_DEV_EVENT_PORT_UP,
219 						    port);
220 				mlx4_priv(dev)->sense.do_sense_port[port] = 0;
221 			}
222 			break;
223 
224 		case MLX4_EVENT_TYPE_CQ_ERROR:
225 			mlx4_warn(dev, "CQ %s on CQN %06x\n",
226 				  eqe->event.cq_err.syndrome == 1 ?
227 				  "overrun" : "access violation",
228 				  be32_to_cpu(eqe->event.cq_err.cqn) & 0xffffff);
229 			mlx4_cq_event(dev, be32_to_cpu(eqe->event.cq_err.cqn),
230 				      eqe->type);
231 			break;
232 
233 		case MLX4_EVENT_TYPE_EQ_OVERFLOW:
234 			mlx4_warn(dev, "EQ overrun on EQN %d\n", eq->eqn);
235 			break;
236 
237 		case MLX4_EVENT_TYPE_EEC_CATAS_ERROR:
238 		case MLX4_EVENT_TYPE_ECC_DETECT:
239 		default:
240 			mlx4_warn(dev, "Unhandled event %02x(%02x) on EQ %d at index %u\n",
241 				  eqe->type, eqe->subtype, eq->eqn, eq->cons_index);
242 			break;
243 		}
244 
245 		++eq->cons_index;
246 		eqes_found = 1;
247 		++set_ci;
248 
249 		/*
250 		 * The HCA will think the queue has overflowed if we
251 		 * don't tell it we've been processing events.  We
252 		 * create our EQs with MLX4_NUM_SPARE_EQE extra
253 		 * entries, so we must update our consumer index at
254 		 * least that often.
255 		 */
256 		if (unlikely(set_ci >= MLX4_NUM_SPARE_EQE)) {
257 			eq_set_ci(eq, 0);
258 			set_ci = 0;
259 		}
260 	}
261 
262 	eq_set_ci(eq, 1);
263 
264 	return eqes_found;
265 }
266 
267 static irqreturn_t mlx4_interrupt(int irq, void *dev_ptr)
268 {
269 	struct mlx4_dev *dev = dev_ptr;
270 	struct mlx4_priv *priv = mlx4_priv(dev);
271 	int work = 0;
272 	int i;
273 
274 	writel(priv->eq_table.clr_mask, priv->eq_table.clr_int);
275 
276 	for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i)
277 		work |= mlx4_eq_int(dev, &priv->eq_table.eq[i]);
278 
279 	return IRQ_RETVAL(work);
280 }
281 
282 static irqreturn_t mlx4_msi_x_interrupt(int irq, void *eq_ptr)
283 {
284 	struct mlx4_eq  *eq  = eq_ptr;
285 	struct mlx4_dev *dev = eq->dev;
286 
287 	mlx4_eq_int(dev, eq);
288 
289 	/* MSI-X vectors always belong to us */
290 	return IRQ_HANDLED;
291 }
292 
293 static int mlx4_MAP_EQ(struct mlx4_dev *dev, u64 event_mask, int unmap,
294 			int eq_num)
295 {
296 	return mlx4_cmd(dev, event_mask, (unmap << 31) | eq_num,
297 			0, MLX4_CMD_MAP_EQ, MLX4_CMD_TIME_CLASS_B);
298 }
299 
300 static int mlx4_SW2HW_EQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
301 			 int eq_num)
302 {
303 	return mlx4_cmd(dev, mailbox->dma, eq_num, 0, MLX4_CMD_SW2HW_EQ,
304 			MLX4_CMD_TIME_CLASS_A);
305 }
306 
307 static int mlx4_HW2SW_EQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
308 			 int eq_num)
309 {
310 	return mlx4_cmd_box(dev, 0, mailbox->dma, eq_num, 0, MLX4_CMD_HW2SW_EQ,
311 			    MLX4_CMD_TIME_CLASS_A);
312 }
313 
314 static int mlx4_num_eq_uar(struct mlx4_dev *dev)
315 {
316 	/*
317 	 * Each UAR holds 4 EQ doorbells.  To figure out how many UARs
318 	 * we need to map, take the difference of highest index and
319 	 * the lowest index we'll use and add 1.
320 	 */
321 	return (dev->caps.num_comp_vectors + 1 + dev->caps.reserved_eqs +
322 		 dev->caps.comp_pool)/4 - dev->caps.reserved_eqs/4 + 1;
323 }
324 
325 static void __iomem *mlx4_get_eq_uar(struct mlx4_dev *dev, struct mlx4_eq *eq)
326 {
327 	struct mlx4_priv *priv = mlx4_priv(dev);
328 	int index;
329 
330 	index = eq->eqn / 4 - dev->caps.reserved_eqs / 4;
331 
332 	if (!priv->eq_table.uar_map[index]) {
333 		priv->eq_table.uar_map[index] =
334 			ioremap(pci_resource_start(dev->pdev, 2) +
335 				((eq->eqn / 4) << PAGE_SHIFT),
336 				PAGE_SIZE);
337 		if (!priv->eq_table.uar_map[index]) {
338 			mlx4_err(dev, "Couldn't map EQ doorbell for EQN 0x%06x\n",
339 				 eq->eqn);
340 			return NULL;
341 		}
342 	}
343 
344 	return priv->eq_table.uar_map[index] + 0x800 + 8 * (eq->eqn % 4);
345 }
346 
347 static int mlx4_create_eq(struct mlx4_dev *dev, int nent,
348 			  u8 intr, struct mlx4_eq *eq)
349 {
350 	struct mlx4_priv *priv = mlx4_priv(dev);
351 	struct mlx4_cmd_mailbox *mailbox;
352 	struct mlx4_eq_context *eq_context;
353 	int npages;
354 	u64 *dma_list = NULL;
355 	dma_addr_t t;
356 	u64 mtt_addr;
357 	int err = -ENOMEM;
358 	int i;
359 
360 	eq->dev   = dev;
361 	eq->nent  = roundup_pow_of_two(max(nent, 2));
362 	npages = PAGE_ALIGN(eq->nent * MLX4_EQ_ENTRY_SIZE) / PAGE_SIZE;
363 
364 	eq->page_list = kmalloc(npages * sizeof *eq->page_list,
365 				GFP_KERNEL);
366 	if (!eq->page_list)
367 		goto err_out;
368 
369 	for (i = 0; i < npages; ++i)
370 		eq->page_list[i].buf = NULL;
371 
372 	dma_list = kmalloc(npages * sizeof *dma_list, GFP_KERNEL);
373 	if (!dma_list)
374 		goto err_out_free;
375 
376 	mailbox = mlx4_alloc_cmd_mailbox(dev);
377 	if (IS_ERR(mailbox))
378 		goto err_out_free;
379 	eq_context = mailbox->buf;
380 
381 	for (i = 0; i < npages; ++i) {
382 		eq->page_list[i].buf = dma_alloc_coherent(&dev->pdev->dev,
383 							  PAGE_SIZE, &t, GFP_KERNEL);
384 		if (!eq->page_list[i].buf)
385 			goto err_out_free_pages;
386 
387 		dma_list[i] = t;
388 		eq->page_list[i].map = t;
389 
390 		memset(eq->page_list[i].buf, 0, PAGE_SIZE);
391 	}
392 
393 	eq->eqn = mlx4_bitmap_alloc(&priv->eq_table.bitmap);
394 	if (eq->eqn == -1)
395 		goto err_out_free_pages;
396 
397 	eq->doorbell = mlx4_get_eq_uar(dev, eq);
398 	if (!eq->doorbell) {
399 		err = -ENOMEM;
400 		goto err_out_free_eq;
401 	}
402 
403 	err = mlx4_mtt_init(dev, npages, PAGE_SHIFT, &eq->mtt);
404 	if (err)
405 		goto err_out_free_eq;
406 
407 	err = mlx4_write_mtt(dev, &eq->mtt, 0, npages, dma_list);
408 	if (err)
409 		goto err_out_free_mtt;
410 
411 	memset(eq_context, 0, sizeof *eq_context);
412 	eq_context->flags	  = cpu_to_be32(MLX4_EQ_STATUS_OK   |
413 						MLX4_EQ_STATE_ARMED);
414 	eq_context->log_eq_size	  = ilog2(eq->nent);
415 	eq_context->intr	  = intr;
416 	eq_context->log_page_size = PAGE_SHIFT - MLX4_ICM_PAGE_SHIFT;
417 
418 	mtt_addr = mlx4_mtt_addr(dev, &eq->mtt);
419 	eq_context->mtt_base_addr_h = mtt_addr >> 32;
420 	eq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
421 
422 	err = mlx4_SW2HW_EQ(dev, mailbox, eq->eqn);
423 	if (err) {
424 		mlx4_warn(dev, "SW2HW_EQ failed (%d)\n", err);
425 		goto err_out_free_mtt;
426 	}
427 
428 	kfree(dma_list);
429 	mlx4_free_cmd_mailbox(dev, mailbox);
430 
431 	eq->cons_index = 0;
432 
433 	return err;
434 
435 err_out_free_mtt:
436 	mlx4_mtt_cleanup(dev, &eq->mtt);
437 
438 err_out_free_eq:
439 	mlx4_bitmap_free(&priv->eq_table.bitmap, eq->eqn);
440 
441 err_out_free_pages:
442 	for (i = 0; i < npages; ++i)
443 		if (eq->page_list[i].buf)
444 			dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
445 					  eq->page_list[i].buf,
446 					  eq->page_list[i].map);
447 
448 	mlx4_free_cmd_mailbox(dev, mailbox);
449 
450 err_out_free:
451 	kfree(eq->page_list);
452 	kfree(dma_list);
453 
454 err_out:
455 	return err;
456 }
457 
458 static void mlx4_free_eq(struct mlx4_dev *dev,
459 			 struct mlx4_eq *eq)
460 {
461 	struct mlx4_priv *priv = mlx4_priv(dev);
462 	struct mlx4_cmd_mailbox *mailbox;
463 	int err;
464 	int npages = PAGE_ALIGN(MLX4_EQ_ENTRY_SIZE * eq->nent) / PAGE_SIZE;
465 	int i;
466 
467 	mailbox = mlx4_alloc_cmd_mailbox(dev);
468 	if (IS_ERR(mailbox))
469 		return;
470 
471 	err = mlx4_HW2SW_EQ(dev, mailbox, eq->eqn);
472 	if (err)
473 		mlx4_warn(dev, "HW2SW_EQ failed (%d)\n", err);
474 
475 	if (0) {
476 		mlx4_dbg(dev, "Dumping EQ context %02x:\n", eq->eqn);
477 		for (i = 0; i < sizeof (struct mlx4_eq_context) / 4; ++i) {
478 			if (i % 4 == 0)
479 				pr_cont("[%02x] ", i * 4);
480 			pr_cont(" %08x", be32_to_cpup(mailbox->buf + i * 4));
481 			if ((i + 1) % 4 == 0)
482 				pr_cont("\n");
483 		}
484 	}
485 
486 	mlx4_mtt_cleanup(dev, &eq->mtt);
487 	for (i = 0; i < npages; ++i)
488 		dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
489 				    eq->page_list[i].buf,
490 				    eq->page_list[i].map);
491 
492 	kfree(eq->page_list);
493 	mlx4_bitmap_free(&priv->eq_table.bitmap, eq->eqn);
494 	mlx4_free_cmd_mailbox(dev, mailbox);
495 }
496 
497 static void mlx4_free_irqs(struct mlx4_dev *dev)
498 {
499 	struct mlx4_eq_table *eq_table = &mlx4_priv(dev)->eq_table;
500 	struct mlx4_priv *priv = mlx4_priv(dev);
501 	int	i, vec;
502 
503 	if (eq_table->have_irq)
504 		free_irq(dev->pdev->irq, dev);
505 
506 	for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i)
507 		if (eq_table->eq[i].have_irq) {
508 			free_irq(eq_table->eq[i].irq, eq_table->eq + i);
509 			eq_table->eq[i].have_irq = 0;
510 		}
511 
512 	for (i = 0; i < dev->caps.comp_pool; i++) {
513 		/*
514 		 * Freeing the assigned irq's
515 		 * all bits should be 0, but we need to validate
516 		 */
517 		if (priv->msix_ctl.pool_bm & 1ULL << i) {
518 			/* NO need protecting*/
519 			vec = dev->caps.num_comp_vectors + 1 + i;
520 			free_irq(priv->eq_table.eq[vec].irq,
521 				 &priv->eq_table.eq[vec]);
522 		}
523 	}
524 
525 
526 	kfree(eq_table->irq_names);
527 }
528 
529 static int mlx4_map_clr_int(struct mlx4_dev *dev)
530 {
531 	struct mlx4_priv *priv = mlx4_priv(dev);
532 
533 	priv->clr_base = ioremap(pci_resource_start(dev->pdev, priv->fw.clr_int_bar) +
534 				 priv->fw.clr_int_base, MLX4_CLR_INT_SIZE);
535 	if (!priv->clr_base) {
536 		mlx4_err(dev, "Couldn't map interrupt clear register, aborting.\n");
537 		return -ENOMEM;
538 	}
539 
540 	return 0;
541 }
542 
543 static void mlx4_unmap_clr_int(struct mlx4_dev *dev)
544 {
545 	struct mlx4_priv *priv = mlx4_priv(dev);
546 
547 	iounmap(priv->clr_base);
548 }
549 
550 int mlx4_alloc_eq_table(struct mlx4_dev *dev)
551 {
552 	struct mlx4_priv *priv = mlx4_priv(dev);
553 
554 	priv->eq_table.eq = kcalloc(dev->caps.num_eqs - dev->caps.reserved_eqs,
555 				    sizeof *priv->eq_table.eq, GFP_KERNEL);
556 	if (!priv->eq_table.eq)
557 		return -ENOMEM;
558 
559 	return 0;
560 }
561 
562 void mlx4_free_eq_table(struct mlx4_dev *dev)
563 {
564 	kfree(mlx4_priv(dev)->eq_table.eq);
565 }
566 
567 int mlx4_init_eq_table(struct mlx4_dev *dev)
568 {
569 	struct mlx4_priv *priv = mlx4_priv(dev);
570 	int err;
571 	int i;
572 
573 	priv->eq_table.uar_map = kcalloc(sizeof *priv->eq_table.uar_map,
574 					 mlx4_num_eq_uar(dev), GFP_KERNEL);
575 	if (!priv->eq_table.uar_map) {
576 		err = -ENOMEM;
577 		goto err_out_free;
578 	}
579 
580 	err = mlx4_bitmap_init(&priv->eq_table.bitmap, dev->caps.num_eqs,
581 			       dev->caps.num_eqs - 1, dev->caps.reserved_eqs, 0);
582 	if (err)
583 		goto err_out_free;
584 
585 	for (i = 0; i < mlx4_num_eq_uar(dev); ++i)
586 		priv->eq_table.uar_map[i] = NULL;
587 
588 	err = mlx4_map_clr_int(dev);
589 	if (err)
590 		goto err_out_bitmap;
591 
592 	priv->eq_table.clr_mask =
593 		swab32(1 << (priv->eq_table.inta_pin & 31));
594 	priv->eq_table.clr_int  = priv->clr_base +
595 		(priv->eq_table.inta_pin < 32 ? 4 : 0);
596 
597 	priv->eq_table.irq_names =
598 		kmalloc(MLX4_IRQNAME_SIZE * (dev->caps.num_comp_vectors + 1 +
599 					     dev->caps.comp_pool),
600 			GFP_KERNEL);
601 	if (!priv->eq_table.irq_names) {
602 		err = -ENOMEM;
603 		goto err_out_bitmap;
604 	}
605 
606 	for (i = 0; i < dev->caps.num_comp_vectors; ++i) {
607 		err = mlx4_create_eq(dev, dev->caps.num_cqs -
608 					  dev->caps.reserved_cqs +
609 					  MLX4_NUM_SPARE_EQE,
610 				     (dev->flags & MLX4_FLAG_MSI_X) ? i : 0,
611 				     &priv->eq_table.eq[i]);
612 		if (err) {
613 			--i;
614 			goto err_out_unmap;
615 		}
616 	}
617 
618 	err = mlx4_create_eq(dev, MLX4_NUM_ASYNC_EQE + MLX4_NUM_SPARE_EQE,
619 			     (dev->flags & MLX4_FLAG_MSI_X) ? dev->caps.num_comp_vectors : 0,
620 			     &priv->eq_table.eq[dev->caps.num_comp_vectors]);
621 	if (err)
622 		goto err_out_comp;
623 
624 	/*if additional completion vectors poolsize is 0 this loop will not run*/
625 	for (i = dev->caps.num_comp_vectors + 1;
626 	      i < dev->caps.num_comp_vectors + dev->caps.comp_pool + 1; ++i) {
627 
628 		err = mlx4_create_eq(dev, dev->caps.num_cqs -
629 					  dev->caps.reserved_cqs +
630 					  MLX4_NUM_SPARE_EQE,
631 				     (dev->flags & MLX4_FLAG_MSI_X) ? i : 0,
632 				     &priv->eq_table.eq[i]);
633 		if (err) {
634 			--i;
635 			goto err_out_unmap;
636 		}
637 	}
638 
639 
640 	if (dev->flags & MLX4_FLAG_MSI_X) {
641 		const char *eq_name;
642 
643 		for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i) {
644 			if (i < dev->caps.num_comp_vectors) {
645 				snprintf(priv->eq_table.irq_names +
646 					 i * MLX4_IRQNAME_SIZE,
647 					 MLX4_IRQNAME_SIZE,
648 					 "mlx4-comp-%d@pci:%s", i,
649 					 pci_name(dev->pdev));
650 			} else {
651 				snprintf(priv->eq_table.irq_names +
652 					 i * MLX4_IRQNAME_SIZE,
653 					 MLX4_IRQNAME_SIZE,
654 					 "mlx4-async@pci:%s",
655 					 pci_name(dev->pdev));
656 			}
657 
658 			eq_name = priv->eq_table.irq_names +
659 				  i * MLX4_IRQNAME_SIZE;
660 			err = request_irq(priv->eq_table.eq[i].irq,
661 					  mlx4_msi_x_interrupt, 0, eq_name,
662 					  priv->eq_table.eq + i);
663 			if (err)
664 				goto err_out_async;
665 
666 			priv->eq_table.eq[i].have_irq = 1;
667 		}
668 	} else {
669 		snprintf(priv->eq_table.irq_names,
670 			 MLX4_IRQNAME_SIZE,
671 			 DRV_NAME "@pci:%s",
672 			 pci_name(dev->pdev));
673 		err = request_irq(dev->pdev->irq, mlx4_interrupt,
674 				  IRQF_SHARED, priv->eq_table.irq_names, dev);
675 		if (err)
676 			goto err_out_async;
677 
678 		priv->eq_table.have_irq = 1;
679 	}
680 
681 	err = mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 0,
682 			  priv->eq_table.eq[dev->caps.num_comp_vectors].eqn);
683 	if (err)
684 		mlx4_warn(dev, "MAP_EQ for async EQ %d failed (%d)\n",
685 			   priv->eq_table.eq[dev->caps.num_comp_vectors].eqn, err);
686 
687 	for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i)
688 		eq_set_ci(&priv->eq_table.eq[i], 1);
689 
690 	return 0;
691 
692 err_out_async:
693 	mlx4_free_eq(dev, &priv->eq_table.eq[dev->caps.num_comp_vectors]);
694 
695 err_out_comp:
696 	i = dev->caps.num_comp_vectors - 1;
697 
698 err_out_unmap:
699 	while (i >= 0) {
700 		mlx4_free_eq(dev, &priv->eq_table.eq[i]);
701 		--i;
702 	}
703 	mlx4_unmap_clr_int(dev);
704 	mlx4_free_irqs(dev);
705 
706 err_out_bitmap:
707 	mlx4_bitmap_cleanup(&priv->eq_table.bitmap);
708 
709 err_out_free:
710 	kfree(priv->eq_table.uar_map);
711 
712 	return err;
713 }
714 
715 void mlx4_cleanup_eq_table(struct mlx4_dev *dev)
716 {
717 	struct mlx4_priv *priv = mlx4_priv(dev);
718 	int i;
719 
720 	mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 1,
721 		    priv->eq_table.eq[dev->caps.num_comp_vectors].eqn);
722 
723 	mlx4_free_irqs(dev);
724 
725 	for (i = 0; i < dev->caps.num_comp_vectors + dev->caps.comp_pool + 1; ++i)
726 		mlx4_free_eq(dev, &priv->eq_table.eq[i]);
727 
728 	mlx4_unmap_clr_int(dev);
729 
730 	for (i = 0; i < mlx4_num_eq_uar(dev); ++i)
731 		if (priv->eq_table.uar_map[i])
732 			iounmap(priv->eq_table.uar_map[i]);
733 
734 	mlx4_bitmap_cleanup(&priv->eq_table.bitmap);
735 
736 	kfree(priv->eq_table.uar_map);
737 }
738 
739 /* A test that verifies that we can accept interrupts on all
740  * the irq vectors of the device.
741  * Interrupts are checked using the NOP command.
742  */
743 int mlx4_test_interrupts(struct mlx4_dev *dev)
744 {
745 	struct mlx4_priv *priv = mlx4_priv(dev);
746 	int i;
747 	int err;
748 
749 	err = mlx4_NOP(dev);
750 	/* When not in MSI_X, there is only one irq to check */
751 	if (!(dev->flags & MLX4_FLAG_MSI_X))
752 		return err;
753 
754 	/* A loop over all completion vectors, for each vector we will check
755 	 * whether it works by mapping command completions to that vector
756 	 * and performing a NOP command
757 	 */
758 	for(i = 0; !err && (i < dev->caps.num_comp_vectors); ++i) {
759 		/* Temporary use polling for command completions */
760 		mlx4_cmd_use_polling(dev);
761 
762 		/* Map the new eq to handle all asyncronous events */
763 		err = mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 0,
764 				  priv->eq_table.eq[i].eqn);
765 		if (err) {
766 			mlx4_warn(dev, "Failed mapping eq for interrupt test\n");
767 			mlx4_cmd_use_events(dev);
768 			break;
769 		}
770 
771 		/* Go back to using events */
772 		mlx4_cmd_use_events(dev);
773 		err = mlx4_NOP(dev);
774 	}
775 
776 	/* Return to default */
777 	mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 0,
778 		    priv->eq_table.eq[dev->caps.num_comp_vectors].eqn);
779 	return err;
780 }
781 EXPORT_SYMBOL(mlx4_test_interrupts);
782 
783 int mlx4_assign_eq(struct mlx4_dev *dev, char* name, int * vector)
784 {
785 
786 	struct mlx4_priv *priv = mlx4_priv(dev);
787 	int vec = 0, err = 0, i;
788 
789 	spin_lock(&priv->msix_ctl.pool_lock);
790 	for (i = 0; !vec && i < dev->caps.comp_pool; i++) {
791 		if (~priv->msix_ctl.pool_bm & 1ULL << i) {
792 			priv->msix_ctl.pool_bm |= 1ULL << i;
793 			vec = dev->caps.num_comp_vectors + 1 + i;
794 			snprintf(priv->eq_table.irq_names +
795 					vec * MLX4_IRQNAME_SIZE,
796 					MLX4_IRQNAME_SIZE, "%s", name);
797 			err = request_irq(priv->eq_table.eq[vec].irq,
798 					  mlx4_msi_x_interrupt, 0,
799 					  &priv->eq_table.irq_names[vec<<5],
800 					  priv->eq_table.eq + vec);
801 			if (err) {
802 				/*zero out bit by fliping it*/
803 				priv->msix_ctl.pool_bm ^= 1 << i;
804 				vec = 0;
805 				continue;
806 				/*we dont want to break here*/
807 			}
808 			eq_set_ci(&priv->eq_table.eq[vec], 1);
809 		}
810 	}
811 	spin_unlock(&priv->msix_ctl.pool_lock);
812 
813 	if (vec) {
814 		*vector = vec;
815 	} else {
816 		*vector = 0;
817 		err = (i == dev->caps.comp_pool) ? -ENOSPC : err;
818 	}
819 	return err;
820 }
821 EXPORT_SYMBOL(mlx4_assign_eq);
822 
823 void mlx4_release_eq(struct mlx4_dev *dev, int vec)
824 {
825 	struct mlx4_priv *priv = mlx4_priv(dev);
826 	/*bm index*/
827 	int i = vec - dev->caps.num_comp_vectors - 1;
828 
829 	if (likely(i >= 0)) {
830 		/*sanity check , making sure were not trying to free irq's
831 		  Belonging to a legacy EQ*/
832 		spin_lock(&priv->msix_ctl.pool_lock);
833 		if (priv->msix_ctl.pool_bm & 1ULL << i) {
834 			free_irq(priv->eq_table.eq[vec].irq,
835 				 &priv->eq_table.eq[vec]);
836 			priv->msix_ctl.pool_bm &= ~(1ULL << i);
837 		}
838 		spin_unlock(&priv->msix_ctl.pool_lock);
839 	}
840 
841 }
842 EXPORT_SYMBOL(mlx4_release_eq);
843 
844