1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3  * Copyright (c) 2018 Hisilicon Limited.
4  */
5 
6 #include <linux/pci.h>
7 #include <rdma/ib_umem.h>
8 #include "hns_roce_device.h"
9 #include "hns_roce_cmd.h"
10 #include "hns_roce_hem.h"
11 
12 void hns_roce_srq_event(struct hns_roce_dev *hr_dev, u32 srqn, int event_type)
13 {
14 	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
15 	struct hns_roce_srq *srq;
16 
17 	xa_lock(&srq_table->xa);
18 	srq = xa_load(&srq_table->xa, srqn & (hr_dev->caps.num_srqs - 1));
19 	if (srq)
20 		refcount_inc(&srq->refcount);
21 	xa_unlock(&srq_table->xa);
22 
23 	if (!srq) {
24 		dev_warn(hr_dev->dev, "Async event for bogus SRQ %08x\n", srqn);
25 		return;
26 	}
27 
28 	srq->event(srq, event_type);
29 
30 	if (refcount_dec_and_test(&srq->refcount))
31 		complete(&srq->free);
32 }
33 
34 static void hns_roce_ib_srq_event(struct hns_roce_srq *srq,
35 				  enum hns_roce_event event_type)
36 {
37 	struct hns_roce_dev *hr_dev = to_hr_dev(srq->ibsrq.device);
38 	struct ib_srq *ibsrq = &srq->ibsrq;
39 	struct ib_event event;
40 
41 	if (ibsrq->event_handler) {
42 		event.device      = ibsrq->device;
43 		event.element.srq = ibsrq;
44 		switch (event_type) {
45 		case HNS_ROCE_EVENT_TYPE_SRQ_LIMIT_REACH:
46 			event.event = IB_EVENT_SRQ_LIMIT_REACHED;
47 			break;
48 		case HNS_ROCE_EVENT_TYPE_SRQ_CATAS_ERROR:
49 			event.event = IB_EVENT_SRQ_ERR;
50 			break;
51 		default:
52 			dev_err(hr_dev->dev,
53 			   "hns_roce:Unexpected event type 0x%x on SRQ %06lx\n",
54 			   event_type, srq->srqn);
55 			return;
56 		}
57 
58 		ibsrq->event_handler(&event, ibsrq->srq_context);
59 	}
60 }
61 
62 static int alloc_srqn(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
63 {
64 	struct hns_roce_ida *srq_ida = &hr_dev->srq_table.srq_ida;
65 	int id;
66 
67 	id = ida_alloc_range(&srq_ida->ida, srq_ida->min, srq_ida->max,
68 			     GFP_KERNEL);
69 	if (id < 0) {
70 		ibdev_err(&hr_dev->ib_dev, "failed to alloc srq(%d).\n", id);
71 		return -ENOMEM;
72 	}
73 
74 	srq->srqn = id;
75 
76 	return 0;
77 }
78 
79 static void free_srqn(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
80 {
81 	ida_free(&hr_dev->srq_table.srq_ida.ida, (int)srq->srqn);
82 }
83 
84 static int hns_roce_create_srqc(struct hns_roce_dev *hr_dev,
85 				struct hns_roce_srq *srq)
86 {
87 	struct ib_device *ibdev = &hr_dev->ib_dev;
88 	struct hns_roce_cmd_mailbox *mailbox;
89 	int ret;
90 
91 	mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
92 	if (IS_ERR(mailbox)) {
93 		ibdev_err(ibdev, "failed to alloc mailbox for SRQC.\n");
94 		return PTR_ERR(mailbox);
95 	}
96 
97 	ret = hr_dev->hw->write_srqc(srq, mailbox->buf);
98 	if (ret) {
99 		ibdev_err(ibdev, "failed to write SRQC.\n");
100 		goto err_mbox;
101 	}
102 
103 	ret = hns_roce_create_hw_ctx(hr_dev, mailbox, HNS_ROCE_CMD_CREATE_SRQ,
104 				     srq->srqn);
105 	if (ret)
106 		ibdev_err(ibdev, "failed to config SRQC, ret = %d.\n", ret);
107 
108 err_mbox:
109 	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
110 	return ret;
111 }
112 
113 static int alloc_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
114 {
115 	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
116 	struct ib_device *ibdev = &hr_dev->ib_dev;
117 	int ret;
118 
119 	ret = hns_roce_table_get(hr_dev, &srq_table->table, srq->srqn);
120 	if (ret) {
121 		ibdev_err(ibdev, "failed to get SRQC table, ret = %d.\n", ret);
122 		return ret;
123 	}
124 
125 	ret = xa_err(xa_store_irq(&srq_table->xa, srq->srqn, srq, GFP_KERNEL));
126 	if (ret) {
127 		ibdev_err(ibdev, "failed to store SRQC, ret = %d.\n", ret);
128 		goto err_put;
129 	}
130 
131 	ret = hns_roce_create_srqc(hr_dev, srq);
132 	if (ret)
133 		goto err_xa;
134 
135 	return 0;
136 
137 err_xa:
138 	xa_erase_irq(&srq_table->xa, srq->srqn);
139 err_put:
140 	hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
141 
142 	return ret;
143 }
144 
145 static void free_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
146 {
147 	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
148 	int ret;
149 
150 	ret = hns_roce_destroy_hw_ctx(hr_dev, HNS_ROCE_CMD_DESTROY_SRQ,
151 				      srq->srqn);
152 	if (ret)
153 		dev_err(hr_dev->dev, "DESTROY_SRQ failed (%d) for SRQN %06lx\n",
154 			ret, srq->srqn);
155 
156 	xa_erase_irq(&srq_table->xa, srq->srqn);
157 
158 	if (refcount_dec_and_test(&srq->refcount))
159 		complete(&srq->free);
160 	wait_for_completion(&srq->free);
161 
162 	hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
163 }
164 
165 static int alloc_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
166 			 struct ib_udata *udata, unsigned long addr)
167 {
168 	struct hns_roce_idx_que *idx_que = &srq->idx_que;
169 	struct ib_device *ibdev = &hr_dev->ib_dev;
170 	struct hns_roce_buf_attr buf_attr = {};
171 	int ret;
172 
173 	srq->idx_que.entry_shift = ilog2(HNS_ROCE_IDX_QUE_ENTRY_SZ);
174 
175 	buf_attr.page_shift = hr_dev->caps.idx_buf_pg_sz + PAGE_SHIFT;
176 	buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
177 					srq->idx_que.entry_shift);
178 	buf_attr.region[0].hopnum = hr_dev->caps.idx_hop_num;
179 	buf_attr.region_count = 1;
180 
181 	ret = hns_roce_mtr_create(hr_dev, &idx_que->mtr, &buf_attr,
182 				  hr_dev->caps.idx_ba_pg_sz + PAGE_SHIFT,
183 				  udata, addr);
184 	if (ret) {
185 		ibdev_err(ibdev,
186 			  "failed to alloc SRQ idx mtr, ret = %d.\n", ret);
187 		return ret;
188 	}
189 
190 	if (!udata) {
191 		idx_que->bitmap = bitmap_zalloc(srq->wqe_cnt, GFP_KERNEL);
192 		if (!idx_que->bitmap) {
193 			ibdev_err(ibdev, "failed to alloc SRQ idx bitmap.\n");
194 			ret = -ENOMEM;
195 			goto err_idx_mtr;
196 		}
197 	}
198 
199 	idx_que->head = 0;
200 	idx_que->tail = 0;
201 
202 	return 0;
203 err_idx_mtr:
204 	hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
205 
206 	return ret;
207 }
208 
209 static void free_srq_idx(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
210 {
211 	struct hns_roce_idx_que *idx_que = &srq->idx_que;
212 
213 	bitmap_free(idx_que->bitmap);
214 	idx_que->bitmap = NULL;
215 	hns_roce_mtr_destroy(hr_dev, &idx_que->mtr);
216 }
217 
218 static int alloc_srq_wqe_buf(struct hns_roce_dev *hr_dev,
219 			     struct hns_roce_srq *srq,
220 			     struct ib_udata *udata, unsigned long addr)
221 {
222 	struct ib_device *ibdev = &hr_dev->ib_dev;
223 	struct hns_roce_buf_attr buf_attr = {};
224 	int ret;
225 
226 	srq->wqe_shift = ilog2(roundup_pow_of_two(max(HNS_ROCE_SGE_SIZE,
227 						      HNS_ROCE_SGE_SIZE *
228 						      srq->max_gs)));
229 
230 	buf_attr.page_shift = hr_dev->caps.srqwqe_buf_pg_sz + PAGE_SHIFT;
231 	buf_attr.region[0].size = to_hr_hem_entries_size(srq->wqe_cnt,
232 							 srq->wqe_shift);
233 	buf_attr.region[0].hopnum = hr_dev->caps.srqwqe_hop_num;
234 	buf_attr.region_count = 1;
235 
236 	ret = hns_roce_mtr_create(hr_dev, &srq->buf_mtr, &buf_attr,
237 				  hr_dev->caps.srqwqe_ba_pg_sz + PAGE_SHIFT,
238 				  udata, addr);
239 	if (ret)
240 		ibdev_err(ibdev,
241 			  "failed to alloc SRQ buf mtr, ret = %d.\n", ret);
242 
243 	return ret;
244 }
245 
246 static void free_srq_wqe_buf(struct hns_roce_dev *hr_dev,
247 			     struct hns_roce_srq *srq)
248 {
249 	hns_roce_mtr_destroy(hr_dev, &srq->buf_mtr);
250 }
251 
252 static int alloc_srq_wrid(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
253 {
254 	srq->wrid = kvmalloc_array(srq->wqe_cnt, sizeof(u64), GFP_KERNEL);
255 	if (!srq->wrid)
256 		return -ENOMEM;
257 
258 	return 0;
259 }
260 
261 static void free_srq_wrid(struct hns_roce_srq *srq)
262 {
263 	kvfree(srq->wrid);
264 	srq->wrid = NULL;
265 }
266 
267 static u32 proc_srq_sge(struct hns_roce_dev *dev, struct hns_roce_srq *hr_srq,
268 			bool user)
269 {
270 	u32 max_sge = dev->caps.max_srq_sges;
271 
272 	if (dev->pci_dev->revision >= PCI_REVISION_ID_HIP09)
273 		return max_sge;
274 
275 	/* Reserve SGEs only for HIP08 in kernel; The userspace driver will
276 	 * calculate number of max_sge with reserved SGEs when allocating wqe
277 	 * buf, so there is no need to do this again in kernel. But the number
278 	 * may exceed the capacity of SGEs recorded in the firmware, so the
279 	 * kernel driver should just adapt the value accordingly.
280 	 */
281 	if (user)
282 		max_sge = roundup_pow_of_two(max_sge + 1);
283 	else
284 		hr_srq->rsv_sge = 1;
285 
286 	return max_sge;
287 }
288 
289 static int set_srq_basic_param(struct hns_roce_srq *srq,
290 			       struct ib_srq_init_attr *init_attr,
291 			       struct ib_udata *udata)
292 {
293 	struct hns_roce_dev *hr_dev = to_hr_dev(srq->ibsrq.device);
294 	struct ib_srq_attr *attr = &init_attr->attr;
295 	u32 max_sge;
296 
297 	max_sge = proc_srq_sge(hr_dev, srq, !!udata);
298 	if (attr->max_wr > hr_dev->caps.max_srq_wrs ||
299 	    attr->max_sge > max_sge || !attr->max_sge) {
300 		ibdev_err(&hr_dev->ib_dev,
301 			  "invalid SRQ attr, depth = %u, sge = %u.\n",
302 			  attr->max_wr, attr->max_sge);
303 		return -EINVAL;
304 	}
305 
306 	attr->max_wr = max_t(u32, attr->max_wr, HNS_ROCE_MIN_SRQ_WQE_NUM);
307 	srq->wqe_cnt = roundup_pow_of_two(attr->max_wr);
308 	srq->max_gs = roundup_pow_of_two(attr->max_sge + srq->rsv_sge);
309 
310 	attr->max_wr = srq->wqe_cnt;
311 	attr->max_sge = srq->max_gs - srq->rsv_sge;
312 	attr->srq_limit = 0;
313 
314 	return 0;
315 }
316 
317 static void set_srq_ext_param(struct hns_roce_srq *srq,
318 			      struct ib_srq_init_attr *init_attr)
319 {
320 	srq->cqn = ib_srq_has_cq(init_attr->srq_type) ?
321 		   to_hr_cq(init_attr->ext.cq)->cqn : 0;
322 
323 	srq->xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
324 		     to_hr_xrcd(init_attr->ext.xrc.xrcd)->xrcdn : 0;
325 }
326 
327 static int set_srq_param(struct hns_roce_srq *srq,
328 			 struct ib_srq_init_attr *init_attr,
329 			 struct ib_udata *udata)
330 {
331 	int ret;
332 
333 	ret = set_srq_basic_param(srq, init_attr, udata);
334 	if (ret)
335 		return ret;
336 
337 	set_srq_ext_param(srq, init_attr);
338 
339 	return 0;
340 }
341 
342 static int alloc_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq,
343 			 struct ib_udata *udata)
344 {
345 	struct hns_roce_ib_create_srq ucmd = {};
346 	int ret;
347 
348 	if (udata) {
349 		ret = ib_copy_from_udata(&ucmd, udata,
350 					 min(udata->inlen, sizeof(ucmd)));
351 		if (ret) {
352 			ibdev_err(&hr_dev->ib_dev,
353 				  "failed to copy SRQ udata, ret = %d.\n",
354 				  ret);
355 			return ret;
356 		}
357 	}
358 
359 	ret = alloc_srq_idx(hr_dev, srq, udata, ucmd.que_addr);
360 	if (ret)
361 		return ret;
362 
363 	ret = alloc_srq_wqe_buf(hr_dev, srq, udata, ucmd.buf_addr);
364 	if (ret)
365 		goto err_idx;
366 
367 	if (!udata) {
368 		ret = alloc_srq_wrid(hr_dev, srq);
369 		if (ret)
370 			goto err_wqe_buf;
371 	}
372 
373 	return 0;
374 
375 err_wqe_buf:
376 	free_srq_wqe_buf(hr_dev, srq);
377 err_idx:
378 	free_srq_idx(hr_dev, srq);
379 
380 	return ret;
381 }
382 
383 static void free_srq_buf(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
384 {
385 	free_srq_wrid(srq);
386 	free_srq_wqe_buf(hr_dev, srq);
387 	free_srq_idx(hr_dev, srq);
388 }
389 
390 int hns_roce_create_srq(struct ib_srq *ib_srq,
391 			struct ib_srq_init_attr *init_attr,
392 			struct ib_udata *udata)
393 {
394 	struct hns_roce_dev *hr_dev = to_hr_dev(ib_srq->device);
395 	struct hns_roce_ib_create_srq_resp resp = {};
396 	struct hns_roce_srq *srq = to_hr_srq(ib_srq);
397 	int ret;
398 
399 	mutex_init(&srq->mutex);
400 	spin_lock_init(&srq->lock);
401 
402 	ret = set_srq_param(srq, init_attr, udata);
403 	if (ret)
404 		return ret;
405 
406 	ret = alloc_srq_buf(hr_dev, srq, udata);
407 	if (ret)
408 		return ret;
409 
410 	ret = alloc_srqn(hr_dev, srq);
411 	if (ret)
412 		goto err_srq_buf;
413 
414 	ret = alloc_srqc(hr_dev, srq);
415 	if (ret)
416 		goto err_srqn;
417 
418 	if (udata) {
419 		resp.srqn = srq->srqn;
420 		if (ib_copy_to_udata(udata, &resp,
421 				     min(udata->outlen, sizeof(resp)))) {
422 			ret = -EFAULT;
423 			goto err_srqc;
424 		}
425 	}
426 
427 	srq->db_reg = hr_dev->reg_base + SRQ_DB_REG;
428 	srq->event = hns_roce_ib_srq_event;
429 	refcount_set(&srq->refcount, 1);
430 	init_completion(&srq->free);
431 
432 	return 0;
433 
434 err_srqc:
435 	free_srqc(hr_dev, srq);
436 err_srqn:
437 	free_srqn(hr_dev, srq);
438 err_srq_buf:
439 	free_srq_buf(hr_dev, srq);
440 
441 	return ret;
442 }
443 
444 int hns_roce_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
445 {
446 	struct hns_roce_dev *hr_dev = to_hr_dev(ibsrq->device);
447 	struct hns_roce_srq *srq = to_hr_srq(ibsrq);
448 
449 	free_srqc(hr_dev, srq);
450 	free_srqn(hr_dev, srq);
451 	free_srq_buf(hr_dev, srq);
452 	return 0;
453 }
454 
455 void hns_roce_init_srq_table(struct hns_roce_dev *hr_dev)
456 {
457 	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
458 	struct hns_roce_ida *srq_ida = &srq_table->srq_ida;
459 
460 	xa_init(&srq_table->xa);
461 
462 	ida_init(&srq_ida->ida);
463 	srq_ida->max = hr_dev->caps.num_srqs - 1;
464 	srq_ida->min = hr_dev->caps.reserved_srqs;
465 }
466