1 /*
2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005 Mellanox Technologies. 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/errno.h>
35 #include <linux/interrupt.h>
36 #include <linux/pci.h>
37 #include <linux/slab.h>
38 
39 #include "mthca_dev.h"
40 #include "mthca_cmd.h"
41 #include "mthca_config_reg.h"
42 
43 enum {
44 	MTHCA_NUM_ASYNC_EQE = 0x80,
45 	MTHCA_NUM_CMD_EQE   = 0x80,
46 	MTHCA_NUM_SPARE_EQE = 0x80,
47 	MTHCA_EQ_ENTRY_SIZE = 0x20
48 };
49 
50 /*
51  * Must be packed because start is 64 bits but only aligned to 32 bits.
52  */
53 struct mthca_eq_context {
54 	__be32 flags;
55 	__be64 start;
56 	__be32 logsize_usrpage;
57 	__be32 tavor_pd;	/* reserved for Arbel */
58 	u8     reserved1[3];
59 	u8     intr;
60 	__be32 arbel_pd;	/* lost_count for Tavor */
61 	__be32 lkey;
62 	u32    reserved2[2];
63 	__be32 consumer_index;
64 	__be32 producer_index;
65 	u32    reserved3[4];
66 } __attribute__((packed));
67 
68 #define MTHCA_EQ_STATUS_OK          ( 0 << 28)
69 #define MTHCA_EQ_STATUS_OVERFLOW    ( 9 << 28)
70 #define MTHCA_EQ_STATUS_WRITE_FAIL  (10 << 28)
71 #define MTHCA_EQ_OWNER_SW           ( 0 << 24)
72 #define MTHCA_EQ_OWNER_HW           ( 1 << 24)
73 #define MTHCA_EQ_FLAG_TR            ( 1 << 18)
74 #define MTHCA_EQ_FLAG_OI            ( 1 << 17)
75 #define MTHCA_EQ_STATE_ARMED        ( 1 <<  8)
76 #define MTHCA_EQ_STATE_FIRED        ( 2 <<  8)
77 #define MTHCA_EQ_STATE_ALWAYS_ARMED ( 3 <<  8)
78 #define MTHCA_EQ_STATE_ARBEL        ( 8 <<  8)
79 
80 enum {
81 	MTHCA_EVENT_TYPE_COMP       	    = 0x00,
82 	MTHCA_EVENT_TYPE_PATH_MIG   	    = 0x01,
83 	MTHCA_EVENT_TYPE_COMM_EST   	    = 0x02,
84 	MTHCA_EVENT_TYPE_SQ_DRAINED 	    = 0x03,
85 	MTHCA_EVENT_TYPE_SRQ_QP_LAST_WQE    = 0x13,
86 	MTHCA_EVENT_TYPE_SRQ_LIMIT	    = 0x14,
87 	MTHCA_EVENT_TYPE_CQ_ERROR   	    = 0x04,
88 	MTHCA_EVENT_TYPE_WQ_CATAS_ERROR     = 0x05,
89 	MTHCA_EVENT_TYPE_EEC_CATAS_ERROR    = 0x06,
90 	MTHCA_EVENT_TYPE_PATH_MIG_FAILED    = 0x07,
91 	MTHCA_EVENT_TYPE_WQ_INVAL_REQ_ERROR = 0x10,
92 	MTHCA_EVENT_TYPE_WQ_ACCESS_ERROR    = 0x11,
93 	MTHCA_EVENT_TYPE_SRQ_CATAS_ERROR    = 0x12,
94 	MTHCA_EVENT_TYPE_LOCAL_CATAS_ERROR  = 0x08,
95 	MTHCA_EVENT_TYPE_PORT_CHANGE        = 0x09,
96 	MTHCA_EVENT_TYPE_EQ_OVERFLOW        = 0x0f,
97 	MTHCA_EVENT_TYPE_ECC_DETECT         = 0x0e,
98 	MTHCA_EVENT_TYPE_CMD                = 0x0a
99 };
100 
101 #define MTHCA_ASYNC_EVENT_MASK ((1ULL << MTHCA_EVENT_TYPE_PATH_MIG)           | \
102 				(1ULL << MTHCA_EVENT_TYPE_COMM_EST)           | \
103 				(1ULL << MTHCA_EVENT_TYPE_SQ_DRAINED)         | \
104 				(1ULL << MTHCA_EVENT_TYPE_CQ_ERROR)           | \
105 				(1ULL << MTHCA_EVENT_TYPE_WQ_CATAS_ERROR)     | \
106 				(1ULL << MTHCA_EVENT_TYPE_EEC_CATAS_ERROR)    | \
107 				(1ULL << MTHCA_EVENT_TYPE_PATH_MIG_FAILED)    | \
108 				(1ULL << MTHCA_EVENT_TYPE_WQ_INVAL_REQ_ERROR) | \
109 				(1ULL << MTHCA_EVENT_TYPE_WQ_ACCESS_ERROR)    | \
110 				(1ULL << MTHCA_EVENT_TYPE_LOCAL_CATAS_ERROR)  | \
111 				(1ULL << MTHCA_EVENT_TYPE_PORT_CHANGE)        | \
112 				(1ULL << MTHCA_EVENT_TYPE_ECC_DETECT))
113 #define MTHCA_SRQ_EVENT_MASK   ((1ULL << MTHCA_EVENT_TYPE_SRQ_CATAS_ERROR)    | \
114 				(1ULL << MTHCA_EVENT_TYPE_SRQ_QP_LAST_WQE)    | \
115 				(1ULL << MTHCA_EVENT_TYPE_SRQ_LIMIT))
116 #define MTHCA_CMD_EVENT_MASK    (1ULL << MTHCA_EVENT_TYPE_CMD)
117 
118 #define MTHCA_EQ_DB_INC_CI     (1 << 24)
119 #define MTHCA_EQ_DB_REQ_NOT    (2 << 24)
120 #define MTHCA_EQ_DB_DISARM_CQ  (3 << 24)
121 #define MTHCA_EQ_DB_SET_CI     (4 << 24)
122 #define MTHCA_EQ_DB_ALWAYS_ARM (5 << 24)
123 
124 struct mthca_eqe {
125 	u8 reserved1;
126 	u8 type;
127 	u8 reserved2;
128 	u8 subtype;
129 	union {
130 		u32 raw[6];
131 		struct {
132 			__be32 cqn;
133 		} __attribute__((packed)) comp;
134 		struct {
135 			u16    reserved1;
136 			__be16 token;
137 			u32    reserved2;
138 			u8     reserved3[3];
139 			u8     status;
140 			__be64 out_param;
141 		} __attribute__((packed)) cmd;
142 		struct {
143 			__be32 qpn;
144 		} __attribute__((packed)) qp;
145 		struct {
146 			__be32 srqn;
147 		} __attribute__((packed)) srq;
148 		struct {
149 			__be32 cqn;
150 			u32    reserved1;
151 			u8     reserved2[3];
152 			u8     syndrome;
153 		} __attribute__((packed)) cq_err;
154 		struct {
155 			u32    reserved1[2];
156 			__be32 port;
157 		} __attribute__((packed)) port_change;
158 	} event;
159 	u8 reserved3[3];
160 	u8 owner;
161 } __attribute__((packed));
162 
163 #define  MTHCA_EQ_ENTRY_OWNER_SW      (0 << 7)
164 #define  MTHCA_EQ_ENTRY_OWNER_HW      (1 << 7)
165 
166 static inline u64 async_mask(struct mthca_dev *dev)
167 {
168 	return dev->mthca_flags & MTHCA_FLAG_SRQ ?
169 		MTHCA_ASYNC_EVENT_MASK | MTHCA_SRQ_EVENT_MASK :
170 		MTHCA_ASYNC_EVENT_MASK;
171 }
172 
173 static inline void tavor_set_eq_ci(struct mthca_dev *dev, struct mthca_eq *eq, u32 ci)
174 {
175 	/*
176 	 * This barrier makes sure that all updates to ownership bits
177 	 * done by set_eqe_hw() hit memory before the consumer index
178 	 * is updated.  set_eq_ci() allows the HCA to possibly write
179 	 * more EQ entries, and we want to avoid the exceedingly
180 	 * unlikely possibility of the HCA writing an entry and then
181 	 * having set_eqe_hw() overwrite the owner field.
182 	 */
183 	wmb();
184 	mthca_write64(MTHCA_EQ_DB_SET_CI | eq->eqn, ci & (eq->nent - 1),
185 		      dev->kar + MTHCA_EQ_DOORBELL,
186 		      MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
187 }
188 
189 static inline void arbel_set_eq_ci(struct mthca_dev *dev, struct mthca_eq *eq, u32 ci)
190 {
191 	/* See comment in tavor_set_eq_ci() above. */
192 	wmb();
193 	__raw_writel((__force u32) cpu_to_be32(ci),
194 		     dev->eq_regs.arbel.eq_set_ci_base + eq->eqn * 8);
195 	/* We still want ordering, just not swabbing, so add a barrier */
196 	mb();
197 }
198 
199 static inline void set_eq_ci(struct mthca_dev *dev, struct mthca_eq *eq, u32 ci)
200 {
201 	if (mthca_is_memfree(dev))
202 		arbel_set_eq_ci(dev, eq, ci);
203 	else
204 		tavor_set_eq_ci(dev, eq, ci);
205 }
206 
207 static inline void tavor_eq_req_not(struct mthca_dev *dev, int eqn)
208 {
209 	mthca_write64(MTHCA_EQ_DB_REQ_NOT | eqn, 0,
210 		      dev->kar + MTHCA_EQ_DOORBELL,
211 		      MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
212 }
213 
214 static inline void arbel_eq_req_not(struct mthca_dev *dev, u32 eqn_mask)
215 {
216 	writel(eqn_mask, dev->eq_regs.arbel.eq_arm);
217 }
218 
219 static inline void disarm_cq(struct mthca_dev *dev, int eqn, int cqn)
220 {
221 	if (!mthca_is_memfree(dev)) {
222 		mthca_write64(MTHCA_EQ_DB_DISARM_CQ | eqn, cqn,
223 			      dev->kar + MTHCA_EQ_DOORBELL,
224 			      MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
225 	}
226 }
227 
228 static inline struct mthca_eqe *get_eqe(struct mthca_eq *eq, u32 entry)
229 {
230 	unsigned long off = (entry & (eq->nent - 1)) * MTHCA_EQ_ENTRY_SIZE;
231 	return eq->page_list[off / PAGE_SIZE].buf + off % PAGE_SIZE;
232 }
233 
234 static inline struct mthca_eqe *next_eqe_sw(struct mthca_eq *eq)
235 {
236 	struct mthca_eqe *eqe;
237 	eqe = get_eqe(eq, eq->cons_index);
238 	return (MTHCA_EQ_ENTRY_OWNER_HW & eqe->owner) ? NULL : eqe;
239 }
240 
241 static inline void set_eqe_hw(struct mthca_eqe *eqe)
242 {
243 	eqe->owner =  MTHCA_EQ_ENTRY_OWNER_HW;
244 }
245 
246 static void port_change(struct mthca_dev *dev, int port, int active)
247 {
248 	struct ib_event record;
249 
250 	mthca_dbg(dev, "Port change to %s for port %d\n",
251 		  active ? "active" : "down", port);
252 
253 	record.device = &dev->ib_dev;
254 	record.event  = active ? IB_EVENT_PORT_ACTIVE : IB_EVENT_PORT_ERR;
255 	record.element.port_num = port;
256 
257 	ib_dispatch_event(&record);
258 }
259 
260 static int mthca_eq_int(struct mthca_dev *dev, struct mthca_eq *eq)
261 {
262 	struct mthca_eqe *eqe;
263 	int disarm_cqn;
264 	int eqes_found = 0;
265 	int set_ci = 0;
266 
267 	while ((eqe = next_eqe_sw(eq))) {
268 		/*
269 		 * Make sure we read EQ entry contents after we've
270 		 * checked the ownership bit.
271 		 */
272 		rmb();
273 
274 		switch (eqe->type) {
275 		case MTHCA_EVENT_TYPE_COMP:
276 			disarm_cqn = be32_to_cpu(eqe->event.comp.cqn) & 0xffffff;
277 			disarm_cq(dev, eq->eqn, disarm_cqn);
278 			mthca_cq_completion(dev, disarm_cqn);
279 			break;
280 
281 		case MTHCA_EVENT_TYPE_PATH_MIG:
282 			mthca_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
283 				       IB_EVENT_PATH_MIG);
284 			break;
285 
286 		case MTHCA_EVENT_TYPE_COMM_EST:
287 			mthca_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
288 				       IB_EVENT_COMM_EST);
289 			break;
290 
291 		case MTHCA_EVENT_TYPE_SQ_DRAINED:
292 			mthca_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
293 				       IB_EVENT_SQ_DRAINED);
294 			break;
295 
296 		case MTHCA_EVENT_TYPE_SRQ_QP_LAST_WQE:
297 			mthca_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
298 				       IB_EVENT_QP_LAST_WQE_REACHED);
299 			break;
300 
301 		case MTHCA_EVENT_TYPE_SRQ_LIMIT:
302 			mthca_srq_event(dev, be32_to_cpu(eqe->event.srq.srqn) & 0xffffff,
303 					IB_EVENT_SRQ_LIMIT_REACHED);
304 			break;
305 
306 		case MTHCA_EVENT_TYPE_WQ_CATAS_ERROR:
307 			mthca_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
308 				       IB_EVENT_QP_FATAL);
309 			break;
310 
311 		case MTHCA_EVENT_TYPE_PATH_MIG_FAILED:
312 			mthca_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
313 				       IB_EVENT_PATH_MIG_ERR);
314 			break;
315 
316 		case MTHCA_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
317 			mthca_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
318 				       IB_EVENT_QP_REQ_ERR);
319 			break;
320 
321 		case MTHCA_EVENT_TYPE_WQ_ACCESS_ERROR:
322 			mthca_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
323 				       IB_EVENT_QP_ACCESS_ERR);
324 			break;
325 
326 		case MTHCA_EVENT_TYPE_CMD:
327 			mthca_cmd_event(dev,
328 					be16_to_cpu(eqe->event.cmd.token),
329 					eqe->event.cmd.status,
330 					be64_to_cpu(eqe->event.cmd.out_param));
331 			break;
332 
333 		case MTHCA_EVENT_TYPE_PORT_CHANGE:
334 			port_change(dev,
335 				    (be32_to_cpu(eqe->event.port_change.port) >> 28) & 3,
336 				    eqe->subtype == 0x4);
337 			break;
338 
339 		case MTHCA_EVENT_TYPE_CQ_ERROR:
340 			mthca_warn(dev, "CQ %s on CQN %06x\n",
341 				   eqe->event.cq_err.syndrome == 1 ?
342 				   "overrun" : "access violation",
343 				   be32_to_cpu(eqe->event.cq_err.cqn) & 0xffffff);
344 			mthca_cq_event(dev, be32_to_cpu(eqe->event.cq_err.cqn),
345 				       IB_EVENT_CQ_ERR);
346 			break;
347 
348 		case MTHCA_EVENT_TYPE_EQ_OVERFLOW:
349 			mthca_warn(dev, "EQ overrun on EQN %d\n", eq->eqn);
350 			break;
351 
352 		case MTHCA_EVENT_TYPE_EEC_CATAS_ERROR:
353 		case MTHCA_EVENT_TYPE_SRQ_CATAS_ERROR:
354 		case MTHCA_EVENT_TYPE_LOCAL_CATAS_ERROR:
355 		case MTHCA_EVENT_TYPE_ECC_DETECT:
356 		default:
357 			mthca_warn(dev, "Unhandled event %02x(%02x) on EQ %d\n",
358 				   eqe->type, eqe->subtype, eq->eqn);
359 			break;
360 		};
361 
362 		set_eqe_hw(eqe);
363 		++eq->cons_index;
364 		eqes_found = 1;
365 		++set_ci;
366 
367 		/*
368 		 * The HCA will think the queue has overflowed if we
369 		 * don't tell it we've been processing events.  We
370 		 * create our EQs with MTHCA_NUM_SPARE_EQE extra
371 		 * entries, so we must update our consumer index at
372 		 * least that often.
373 		 */
374 		if (unlikely(set_ci >= MTHCA_NUM_SPARE_EQE)) {
375 			/*
376 			 * Conditional on hca_type is OK here because
377 			 * this is a rare case, not the fast path.
378 			 */
379 			set_eq_ci(dev, eq, eq->cons_index);
380 			set_ci = 0;
381 		}
382 	}
383 
384 	/*
385 	 * Rely on caller to set consumer index so that we don't have
386 	 * to test hca_type in our interrupt handling fast path.
387 	 */
388 	return eqes_found;
389 }
390 
391 static irqreturn_t mthca_tavor_interrupt(int irq, void *dev_ptr)
392 {
393 	struct mthca_dev *dev = dev_ptr;
394 	u32 ecr;
395 	int i;
396 
397 	if (dev->eq_table.clr_mask)
398 		writel(dev->eq_table.clr_mask, dev->eq_table.clr_int);
399 
400 	ecr = readl(dev->eq_regs.tavor.ecr_base + 4);
401 	if (!ecr)
402 		return IRQ_NONE;
403 
404 	writel(ecr, dev->eq_regs.tavor.ecr_base +
405 	       MTHCA_ECR_CLR_BASE - MTHCA_ECR_BASE + 4);
406 
407 	for (i = 0; i < MTHCA_NUM_EQ; ++i)
408 		if (ecr & dev->eq_table.eq[i].eqn_mask) {
409 			if (mthca_eq_int(dev, &dev->eq_table.eq[i]))
410 				tavor_set_eq_ci(dev, &dev->eq_table.eq[i],
411 						dev->eq_table.eq[i].cons_index);
412 			tavor_eq_req_not(dev, dev->eq_table.eq[i].eqn);
413 		}
414 
415 	return IRQ_HANDLED;
416 }
417 
418 static irqreturn_t mthca_tavor_msi_x_interrupt(int irq, void *eq_ptr)
419 {
420 	struct mthca_eq  *eq  = eq_ptr;
421 	struct mthca_dev *dev = eq->dev;
422 
423 	mthca_eq_int(dev, eq);
424 	tavor_set_eq_ci(dev, eq, eq->cons_index);
425 	tavor_eq_req_not(dev, eq->eqn);
426 
427 	/* MSI-X vectors always belong to us */
428 	return IRQ_HANDLED;
429 }
430 
431 static irqreturn_t mthca_arbel_interrupt(int irq, void *dev_ptr)
432 {
433 	struct mthca_dev *dev = dev_ptr;
434 	int work = 0;
435 	int i;
436 
437 	if (dev->eq_table.clr_mask)
438 		writel(dev->eq_table.clr_mask, dev->eq_table.clr_int);
439 
440 	for (i = 0; i < MTHCA_NUM_EQ; ++i)
441 		if (mthca_eq_int(dev, &dev->eq_table.eq[i])) {
442 			work = 1;
443 			arbel_set_eq_ci(dev, &dev->eq_table.eq[i],
444 					dev->eq_table.eq[i].cons_index);
445 		}
446 
447 	arbel_eq_req_not(dev, dev->eq_table.arm_mask);
448 
449 	return IRQ_RETVAL(work);
450 }
451 
452 static irqreturn_t mthca_arbel_msi_x_interrupt(int irq, void *eq_ptr)
453 {
454 	struct mthca_eq  *eq  = eq_ptr;
455 	struct mthca_dev *dev = eq->dev;
456 
457 	mthca_eq_int(dev, eq);
458 	arbel_set_eq_ci(dev, eq, eq->cons_index);
459 	arbel_eq_req_not(dev, eq->eqn_mask);
460 
461 	/* MSI-X vectors always belong to us */
462 	return IRQ_HANDLED;
463 }
464 
465 static int mthca_create_eq(struct mthca_dev *dev,
466 			   int nent,
467 			   u8 intr,
468 			   struct mthca_eq *eq)
469 {
470 	int npages;
471 	u64 *dma_list = NULL;
472 	dma_addr_t t;
473 	struct mthca_mailbox *mailbox;
474 	struct mthca_eq_context *eq_context;
475 	int err = -ENOMEM;
476 	int i;
477 
478 	eq->dev  = dev;
479 	eq->nent = roundup_pow_of_two(max(nent, 2));
480 	npages = ALIGN(eq->nent * MTHCA_EQ_ENTRY_SIZE, PAGE_SIZE) / PAGE_SIZE;
481 
482 	eq->page_list = kmalloc(npages * sizeof *eq->page_list,
483 				GFP_KERNEL);
484 	if (!eq->page_list)
485 		goto err_out;
486 
487 	for (i = 0; i < npages; ++i)
488 		eq->page_list[i].buf = NULL;
489 
490 	dma_list = kmalloc(npages * sizeof *dma_list, GFP_KERNEL);
491 	if (!dma_list)
492 		goto err_out_free;
493 
494 	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
495 	if (IS_ERR(mailbox))
496 		goto err_out_free;
497 	eq_context = mailbox->buf;
498 
499 	for (i = 0; i < npages; ++i) {
500 		eq->page_list[i].buf = dma_alloc_coherent(&dev->pdev->dev,
501 							  PAGE_SIZE, &t, GFP_KERNEL);
502 		if (!eq->page_list[i].buf)
503 			goto err_out_free_pages;
504 
505 		dma_list[i] = t;
506 		dma_unmap_addr_set(&eq->page_list[i], mapping, t);
507 
508 		clear_page(eq->page_list[i].buf);
509 	}
510 
511 	for (i = 0; i < eq->nent; ++i)
512 		set_eqe_hw(get_eqe(eq, i));
513 
514 	eq->eqn = mthca_alloc(&dev->eq_table.alloc);
515 	if (eq->eqn == -1)
516 		goto err_out_free_pages;
517 
518 	err = mthca_mr_alloc_phys(dev, dev->driver_pd.pd_num,
519 				  dma_list, PAGE_SHIFT, npages,
520 				  0, npages * PAGE_SIZE,
521 				  MTHCA_MPT_FLAG_LOCAL_WRITE |
522 				  MTHCA_MPT_FLAG_LOCAL_READ,
523 				  &eq->mr);
524 	if (err)
525 		goto err_out_free_eq;
526 
527 	memset(eq_context, 0, sizeof *eq_context);
528 	eq_context->flags           = cpu_to_be32(MTHCA_EQ_STATUS_OK   |
529 						  MTHCA_EQ_OWNER_HW    |
530 						  MTHCA_EQ_STATE_ARMED |
531 						  MTHCA_EQ_FLAG_TR);
532 	if (mthca_is_memfree(dev))
533 		eq_context->flags  |= cpu_to_be32(MTHCA_EQ_STATE_ARBEL);
534 
535 	eq_context->logsize_usrpage = cpu_to_be32((ffs(eq->nent) - 1) << 24);
536 	if (mthca_is_memfree(dev)) {
537 		eq_context->arbel_pd = cpu_to_be32(dev->driver_pd.pd_num);
538 	} else {
539 		eq_context->logsize_usrpage |= cpu_to_be32(dev->driver_uar.index);
540 		eq_context->tavor_pd         = cpu_to_be32(dev->driver_pd.pd_num);
541 	}
542 	eq_context->intr            = intr;
543 	eq_context->lkey            = cpu_to_be32(eq->mr.ibmr.lkey);
544 
545 	err = mthca_SW2HW_EQ(dev, mailbox, eq->eqn);
546 	if (err) {
547 		mthca_warn(dev, "SW2HW_EQ returned %d\n", err);
548 		goto err_out_free_mr;
549 	}
550 
551 	kfree(dma_list);
552 	mthca_free_mailbox(dev, mailbox);
553 
554 	eq->eqn_mask   = swab32(1 << eq->eqn);
555 	eq->cons_index = 0;
556 
557 	dev->eq_table.arm_mask |= eq->eqn_mask;
558 
559 	mthca_dbg(dev, "Allocated EQ %d with %d entries\n",
560 		  eq->eqn, eq->nent);
561 
562 	return err;
563 
564  err_out_free_mr:
565 	mthca_free_mr(dev, &eq->mr);
566 
567  err_out_free_eq:
568 	mthca_free(&dev->eq_table.alloc, eq->eqn);
569 
570  err_out_free_pages:
571 	for (i = 0; i < npages; ++i)
572 		if (eq->page_list[i].buf)
573 			dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
574 					  eq->page_list[i].buf,
575 					  dma_unmap_addr(&eq->page_list[i],
576 							 mapping));
577 
578 	mthca_free_mailbox(dev, mailbox);
579 
580  err_out_free:
581 	kfree(eq->page_list);
582 	kfree(dma_list);
583 
584  err_out:
585 	return err;
586 }
587 
588 static void mthca_free_eq(struct mthca_dev *dev,
589 			  struct mthca_eq *eq)
590 {
591 	struct mthca_mailbox *mailbox;
592 	int err;
593 	int npages = (eq->nent * MTHCA_EQ_ENTRY_SIZE + PAGE_SIZE - 1) /
594 		PAGE_SIZE;
595 	int i;
596 
597 	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
598 	if (IS_ERR(mailbox))
599 		return;
600 
601 	err = mthca_HW2SW_EQ(dev, mailbox, eq->eqn);
602 	if (err)
603 		mthca_warn(dev, "HW2SW_EQ returned %d\n", err);
604 
605 	dev->eq_table.arm_mask &= ~eq->eqn_mask;
606 
607 	if (0) {
608 		mthca_dbg(dev, "Dumping EQ context %02x:\n", eq->eqn);
609 		for (i = 0; i < sizeof (struct mthca_eq_context) / 4; ++i) {
610 			if (i % 4 == 0)
611 				printk("[%02x] ", i * 4);
612 			printk(" %08x", be32_to_cpup(mailbox->buf + i * 4));
613 			if ((i + 1) % 4 == 0)
614 				printk("\n");
615 		}
616 	}
617 
618 	mthca_free_mr(dev, &eq->mr);
619 	for (i = 0; i < npages; ++i)
620 		pci_free_consistent(dev->pdev, PAGE_SIZE,
621 				    eq->page_list[i].buf,
622 				    dma_unmap_addr(&eq->page_list[i], mapping));
623 
624 	kfree(eq->page_list);
625 	mthca_free_mailbox(dev, mailbox);
626 }
627 
628 static void mthca_free_irqs(struct mthca_dev *dev)
629 {
630 	int i;
631 
632 	if (dev->eq_table.have_irq)
633 		free_irq(dev->pdev->irq, dev);
634 	for (i = 0; i < MTHCA_NUM_EQ; ++i)
635 		if (dev->eq_table.eq[i].have_irq) {
636 			free_irq(dev->eq_table.eq[i].msi_x_vector,
637 				 dev->eq_table.eq + i);
638 			dev->eq_table.eq[i].have_irq = 0;
639 		}
640 }
641 
642 static int mthca_map_reg(struct mthca_dev *dev,
643 			 unsigned long offset, unsigned long size,
644 			 void __iomem **map)
645 {
646 	phys_addr_t base = pci_resource_start(dev->pdev, 0);
647 
648 	*map = ioremap(base + offset, size);
649 	if (!*map)
650 		return -ENOMEM;
651 
652 	return 0;
653 }
654 
655 static int mthca_map_eq_regs(struct mthca_dev *dev)
656 {
657 	if (mthca_is_memfree(dev)) {
658 		/*
659 		 * We assume that the EQ arm and EQ set CI registers
660 		 * fall within the first BAR.  We can't trust the
661 		 * values firmware gives us, since those addresses are
662 		 * valid on the HCA's side of the PCI bus but not
663 		 * necessarily the host side.
664 		 */
665 		if (mthca_map_reg(dev, (pci_resource_len(dev->pdev, 0) - 1) &
666 				  dev->fw.arbel.clr_int_base, MTHCA_CLR_INT_SIZE,
667 				  &dev->clr_base)) {
668 			mthca_err(dev, "Couldn't map interrupt clear register, "
669 				  "aborting.\n");
670 			return -ENOMEM;
671 		}
672 
673 		/*
674 		 * Add 4 because we limit ourselves to EQs 0 ... 31,
675 		 * so we only need the low word of the register.
676 		 */
677 		if (mthca_map_reg(dev, ((pci_resource_len(dev->pdev, 0) - 1) &
678 					dev->fw.arbel.eq_arm_base) + 4, 4,
679 				  &dev->eq_regs.arbel.eq_arm)) {
680 			mthca_err(dev, "Couldn't map EQ arm register, aborting.\n");
681 			iounmap(dev->clr_base);
682 			return -ENOMEM;
683 		}
684 
685 		if (mthca_map_reg(dev, (pci_resource_len(dev->pdev, 0) - 1) &
686 				  dev->fw.arbel.eq_set_ci_base,
687 				  MTHCA_EQ_SET_CI_SIZE,
688 				  &dev->eq_regs.arbel.eq_set_ci_base)) {
689 			mthca_err(dev, "Couldn't map EQ CI register, aborting.\n");
690 			iounmap(dev->eq_regs.arbel.eq_arm);
691 			iounmap(dev->clr_base);
692 			return -ENOMEM;
693 		}
694 	} else {
695 		if (mthca_map_reg(dev, MTHCA_CLR_INT_BASE, MTHCA_CLR_INT_SIZE,
696 				  &dev->clr_base)) {
697 			mthca_err(dev, "Couldn't map interrupt clear register, "
698 				  "aborting.\n");
699 			return -ENOMEM;
700 		}
701 
702 		if (mthca_map_reg(dev, MTHCA_ECR_BASE,
703 				  MTHCA_ECR_SIZE + MTHCA_ECR_CLR_SIZE,
704 				  &dev->eq_regs.tavor.ecr_base)) {
705 			mthca_err(dev, "Couldn't map ecr register, "
706 				  "aborting.\n");
707 			iounmap(dev->clr_base);
708 			return -ENOMEM;
709 		}
710 	}
711 
712 	return 0;
713 
714 }
715 
716 static void mthca_unmap_eq_regs(struct mthca_dev *dev)
717 {
718 	if (mthca_is_memfree(dev)) {
719 		iounmap(dev->eq_regs.arbel.eq_set_ci_base);
720 		iounmap(dev->eq_regs.arbel.eq_arm);
721 		iounmap(dev->clr_base);
722 	} else {
723 		iounmap(dev->eq_regs.tavor.ecr_base);
724 		iounmap(dev->clr_base);
725 	}
726 }
727 
728 int mthca_map_eq_icm(struct mthca_dev *dev, u64 icm_virt)
729 {
730 	int ret;
731 
732 	/*
733 	 * We assume that mapping one page is enough for the whole EQ
734 	 * context table.  This is fine with all current HCAs, because
735 	 * we only use 32 EQs and each EQ uses 32 bytes of context
736 	 * memory, or 1 KB total.
737 	 */
738 	dev->eq_table.icm_virt = icm_virt;
739 	dev->eq_table.icm_page = alloc_page(GFP_HIGHUSER);
740 	if (!dev->eq_table.icm_page)
741 		return -ENOMEM;
742 	dev->eq_table.icm_dma  = pci_map_page(dev->pdev, dev->eq_table.icm_page, 0,
743 					      PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
744 	if (pci_dma_mapping_error(dev->pdev, dev->eq_table.icm_dma)) {
745 		__free_page(dev->eq_table.icm_page);
746 		return -ENOMEM;
747 	}
748 
749 	ret = mthca_MAP_ICM_page(dev, dev->eq_table.icm_dma, icm_virt);
750 	if (ret) {
751 		pci_unmap_page(dev->pdev, dev->eq_table.icm_dma, PAGE_SIZE,
752 			       PCI_DMA_BIDIRECTIONAL);
753 		__free_page(dev->eq_table.icm_page);
754 	}
755 
756 	return ret;
757 }
758 
759 void mthca_unmap_eq_icm(struct mthca_dev *dev)
760 {
761 	mthca_UNMAP_ICM(dev, dev->eq_table.icm_virt, 1);
762 	pci_unmap_page(dev->pdev, dev->eq_table.icm_dma, PAGE_SIZE,
763 		       PCI_DMA_BIDIRECTIONAL);
764 	__free_page(dev->eq_table.icm_page);
765 }
766 
767 int mthca_init_eq_table(struct mthca_dev *dev)
768 {
769 	int err;
770 	u8 intr;
771 	int i;
772 
773 	err = mthca_alloc_init(&dev->eq_table.alloc,
774 			       dev->limits.num_eqs,
775 			       dev->limits.num_eqs - 1,
776 			       dev->limits.reserved_eqs);
777 	if (err)
778 		return err;
779 
780 	err = mthca_map_eq_regs(dev);
781 	if (err)
782 		goto err_out_free;
783 
784 	if (dev->mthca_flags & MTHCA_FLAG_MSI_X) {
785 		dev->eq_table.clr_mask = 0;
786 	} else {
787 		dev->eq_table.clr_mask =
788 			swab32(1 << (dev->eq_table.inta_pin & 31));
789 		dev->eq_table.clr_int  = dev->clr_base +
790 			(dev->eq_table.inta_pin < 32 ? 4 : 0);
791 	}
792 
793 	dev->eq_table.arm_mask = 0;
794 
795 	intr = dev->eq_table.inta_pin;
796 
797 	err = mthca_create_eq(dev, dev->limits.num_cqs + MTHCA_NUM_SPARE_EQE,
798 			      (dev->mthca_flags & MTHCA_FLAG_MSI_X) ? 128 : intr,
799 			      &dev->eq_table.eq[MTHCA_EQ_COMP]);
800 	if (err)
801 		goto err_out_unmap;
802 
803 	err = mthca_create_eq(dev, MTHCA_NUM_ASYNC_EQE + MTHCA_NUM_SPARE_EQE,
804 			      (dev->mthca_flags & MTHCA_FLAG_MSI_X) ? 129 : intr,
805 			      &dev->eq_table.eq[MTHCA_EQ_ASYNC]);
806 	if (err)
807 		goto err_out_comp;
808 
809 	err = mthca_create_eq(dev, MTHCA_NUM_CMD_EQE + MTHCA_NUM_SPARE_EQE,
810 			      (dev->mthca_flags & MTHCA_FLAG_MSI_X) ? 130 : intr,
811 			      &dev->eq_table.eq[MTHCA_EQ_CMD]);
812 	if (err)
813 		goto err_out_async;
814 
815 	if (dev->mthca_flags & MTHCA_FLAG_MSI_X) {
816 		static const char *eq_name[] = {
817 			[MTHCA_EQ_COMP]  = DRV_NAME "-comp",
818 			[MTHCA_EQ_ASYNC] = DRV_NAME "-async",
819 			[MTHCA_EQ_CMD]   = DRV_NAME "-cmd"
820 		};
821 
822 		for (i = 0; i < MTHCA_NUM_EQ; ++i) {
823 			snprintf(dev->eq_table.eq[i].irq_name,
824 				 IB_DEVICE_NAME_MAX,
825 				 "%s@pci:%s", eq_name[i],
826 				 pci_name(dev->pdev));
827 			err = request_irq(dev->eq_table.eq[i].msi_x_vector,
828 					  mthca_is_memfree(dev) ?
829 					  mthca_arbel_msi_x_interrupt :
830 					  mthca_tavor_msi_x_interrupt,
831 					  0, dev->eq_table.eq[i].irq_name,
832 					  dev->eq_table.eq + i);
833 			if (err)
834 				goto err_out_cmd;
835 			dev->eq_table.eq[i].have_irq = 1;
836 		}
837 	} else {
838 		snprintf(dev->eq_table.eq[0].irq_name, IB_DEVICE_NAME_MAX,
839 			 DRV_NAME "@pci:%s", pci_name(dev->pdev));
840 		err = request_irq(dev->pdev->irq,
841 				  mthca_is_memfree(dev) ?
842 				  mthca_arbel_interrupt :
843 				  mthca_tavor_interrupt,
844 				  IRQF_SHARED, dev->eq_table.eq[0].irq_name, dev);
845 		if (err)
846 			goto err_out_cmd;
847 		dev->eq_table.have_irq = 1;
848 	}
849 
850 	err = mthca_MAP_EQ(dev, async_mask(dev),
851 			   0, dev->eq_table.eq[MTHCA_EQ_ASYNC].eqn);
852 	if (err)
853 		mthca_warn(dev, "MAP_EQ for async EQ %d failed (%d)\n",
854 			   dev->eq_table.eq[MTHCA_EQ_ASYNC].eqn, err);
855 
856 	err = mthca_MAP_EQ(dev, MTHCA_CMD_EVENT_MASK,
857 			   0, dev->eq_table.eq[MTHCA_EQ_CMD].eqn);
858 	if (err)
859 		mthca_warn(dev, "MAP_EQ for cmd EQ %d failed (%d)\n",
860 			   dev->eq_table.eq[MTHCA_EQ_CMD].eqn, err);
861 
862 	for (i = 0; i < MTHCA_NUM_EQ; ++i)
863 		if (mthca_is_memfree(dev))
864 			arbel_eq_req_not(dev, dev->eq_table.eq[i].eqn_mask);
865 		else
866 			tavor_eq_req_not(dev, dev->eq_table.eq[i].eqn);
867 
868 	return 0;
869 
870 err_out_cmd:
871 	mthca_free_irqs(dev);
872 	mthca_free_eq(dev, &dev->eq_table.eq[MTHCA_EQ_CMD]);
873 
874 err_out_async:
875 	mthca_free_eq(dev, &dev->eq_table.eq[MTHCA_EQ_ASYNC]);
876 
877 err_out_comp:
878 	mthca_free_eq(dev, &dev->eq_table.eq[MTHCA_EQ_COMP]);
879 
880 err_out_unmap:
881 	mthca_unmap_eq_regs(dev);
882 
883 err_out_free:
884 	mthca_alloc_cleanup(&dev->eq_table.alloc);
885 	return err;
886 }
887 
888 void mthca_cleanup_eq_table(struct mthca_dev *dev)
889 {
890 	int i;
891 
892 	mthca_free_irqs(dev);
893 
894 	mthca_MAP_EQ(dev, async_mask(dev),
895 		     1, dev->eq_table.eq[MTHCA_EQ_ASYNC].eqn);
896 	mthca_MAP_EQ(dev, MTHCA_CMD_EVENT_MASK,
897 		     1, dev->eq_table.eq[MTHCA_EQ_CMD].eqn);
898 
899 	for (i = 0; i < MTHCA_NUM_EQ; ++i)
900 		mthca_free_eq(dev, &dev->eq_table.eq[i]);
901 
902 	mthca_unmap_eq_regs(dev);
903 
904 	mthca_alloc_cleanup(&dev->eq_table.alloc);
905 }
906