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225c7b1f RD |
1 | /* |
2 | * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. | |
3 | * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. | |
4 | * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved. | |
51a379d0 | 5 | * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved. |
225c7b1f RD |
6 | * Copyright (c) 2004 Voltaire, Inc. All rights reserved. |
7 | * | |
8 | * This software is available to you under a choice of one of two | |
9 | * licenses. You may choose to be licensed under the terms of the GNU | |
10 | * General Public License (GPL) Version 2, available from the file | |
11 | * COPYING in the main directory of this source tree, or the | |
12 | * OpenIB.org BSD license below: | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or | |
15 | * without modification, are permitted provided that the following | |
16 | * conditions are met: | |
17 | * | |
18 | * - Redistributions of source code must retain the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer. | |
21 | * | |
22 | * - Redistributions in binary form must reproduce the above | |
23 | * copyright notice, this list of conditions and the following | |
24 | * disclaimer in the documentation and/or other materials | |
25 | * provided with the distribution. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
28 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
29 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
30 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
31 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
32 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
33 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
34 | * SOFTWARE. | |
35 | */ | |
36 | ||
225c7b1f | 37 | #include <linux/hardirq.h> |
ee40fa06 | 38 | #include <linux/export.h> |
225c7b1f RD |
39 | |
40 | #include <linux/mlx4/cmd.h> | |
3fdcb97f | 41 | #include <linux/mlx4/cq.h> |
225c7b1f RD |
42 | |
43 | #include "mlx4.h" | |
44 | #include "icm.h" | |
45 | ||
225c7b1f RD |
46 | #define MLX4_CQ_STATUS_OK ( 0 << 28) |
47 | #define MLX4_CQ_STATUS_OVERFLOW ( 9 << 28) | |
48 | #define MLX4_CQ_STATUS_WRITE_FAIL (10 << 28) | |
49 | #define MLX4_CQ_FLAG_CC ( 1 << 18) | |
50 | #define MLX4_CQ_FLAG_OI ( 1 << 17) | |
51 | #define MLX4_CQ_STATE_ARMED ( 9 << 8) | |
52 | #define MLX4_CQ_STATE_ARMED_SOL ( 6 << 8) | |
53 | #define MLX4_EQ_STATE_FIRED (10 << 8) | |
54 | ||
3dca0f42 MB |
55 | #define TASKLET_MAX_TIME 2 |
56 | #define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME) | |
57 | ||
58 | void mlx4_cq_tasklet_cb(unsigned long data) | |
59 | { | |
60 | unsigned long flags; | |
61 | unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES; | |
62 | struct mlx4_eq_tasklet *ctx = (struct mlx4_eq_tasklet *)data; | |
63 | struct mlx4_cq *mcq, *temp; | |
64 | ||
65 | spin_lock_irqsave(&ctx->lock, flags); | |
66 | list_splice_tail_init(&ctx->list, &ctx->process_list); | |
67 | spin_unlock_irqrestore(&ctx->lock, flags); | |
68 | ||
69 | list_for_each_entry_safe(mcq, temp, &ctx->process_list, tasklet_ctx.list) { | |
70 | list_del_init(&mcq->tasklet_ctx.list); | |
71 | mcq->tasklet_ctx.comp(mcq); | |
72 | if (atomic_dec_and_test(&mcq->refcount)) | |
73 | complete(&mcq->free); | |
74 | if (time_after(jiffies, end)) | |
75 | break; | |
76 | } | |
77 | ||
78 | if (!list_empty(&ctx->process_list)) | |
79 | tasklet_schedule(&ctx->task); | |
80 | } | |
81 | ||
82 | static void mlx4_add_cq_to_tasklet(struct mlx4_cq *cq) | |
83 | { | |
3dca0f42 | 84 | struct mlx4_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv; |
01f0f425 ED |
85 | unsigned long flags; |
86 | bool kick; | |
3dca0f42 MB |
87 | |
88 | spin_lock_irqsave(&tasklet_ctx->lock, flags); | |
89 | /* When migrating CQs between EQs will be implemented, please note | |
90 | * that you need to sync this point. It is possible that | |
91 | * while migrating a CQ, completions on the old EQs could | |
92 | * still arrive. | |
93 | */ | |
94 | if (list_empty_careful(&cq->tasklet_ctx.list)) { | |
95 | atomic_inc(&cq->refcount); | |
01f0f425 | 96 | kick = list_empty(&tasklet_ctx->list); |
3dca0f42 | 97 | list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list); |
01f0f425 ED |
98 | if (kick) |
99 | tasklet_schedule(&tasklet_ctx->task); | |
3dca0f42 MB |
100 | } |
101 | spin_unlock_irqrestore(&tasklet_ctx->lock, flags); | |
102 | } | |
103 | ||
225c7b1f RD |
104 | void mlx4_cq_completion(struct mlx4_dev *dev, u32 cqn) |
105 | { | |
106 | struct mlx4_cq *cq; | |
107 | ||
291c566a | 108 | rcu_read_lock(); |
225c7b1f RD |
109 | cq = radix_tree_lookup(&mlx4_priv(dev)->cq_table.tree, |
110 | cqn & (dev->caps.num_cqs - 1)); | |
291c566a JM |
111 | rcu_read_unlock(); |
112 | ||
225c7b1f | 113 | if (!cq) { |
d7233386 | 114 | mlx4_dbg(dev, "Completion event for bogus CQ %08x\n", cqn); |
225c7b1f RD |
115 | return; |
116 | } | |
117 | ||
291c566a JM |
118 | /* Acessing the CQ outside of rcu_read_lock is safe, because |
119 | * the CQ is freed only after interrupt handling is completed. | |
120 | */ | |
225c7b1f RD |
121 | ++cq->arm_sn; |
122 | ||
123 | cq->comp(cq); | |
124 | } | |
125 | ||
126 | void mlx4_cq_event(struct mlx4_dev *dev, u32 cqn, int event_type) | |
127 | { | |
128 | struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table; | |
129 | struct mlx4_cq *cq; | |
130 | ||
291c566a | 131 | rcu_read_lock(); |
225c7b1f | 132 | cq = radix_tree_lookup(&cq_table->tree, cqn & (dev->caps.num_cqs - 1)); |
291c566a | 133 | rcu_read_unlock(); |
225c7b1f RD |
134 | |
135 | if (!cq) { | |
291c566a | 136 | mlx4_dbg(dev, "Async event for bogus CQ %08x\n", cqn); |
225c7b1f RD |
137 | return; |
138 | } | |
139 | ||
291c566a JM |
140 | /* Acessing the CQ outside of rcu_read_lock is safe, because |
141 | * the CQ is freed only after interrupt handling is completed. | |
142 | */ | |
225c7b1f | 143 | cq->event(cq, event_type); |
225c7b1f RD |
144 | } |
145 | ||
146 | static int mlx4_SW2HW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox, | |
147 | int cq_num) | |
148 | { | |
eb41049f | 149 | return mlx4_cmd(dev, mailbox->dma, cq_num, 0, |
d7233386 JM |
150 | MLX4_CMD_SW2HW_CQ, MLX4_CMD_TIME_CLASS_A, |
151 | MLX4_CMD_WRAPPED); | |
225c7b1f RD |
152 | } |
153 | ||
3fdcb97f EC |
154 | static int mlx4_MODIFY_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox, |
155 | int cq_num, u32 opmod) | |
156 | { | |
157 | return mlx4_cmd(dev, mailbox->dma, cq_num, opmod, MLX4_CMD_MODIFY_CQ, | |
f9baff50 | 158 | MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED); |
3fdcb97f EC |
159 | } |
160 | ||
225c7b1f RD |
161 | static int mlx4_HW2SW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox, |
162 | int cq_num) | |
163 | { | |
eb41049f | 164 | return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, |
d7233386 | 165 | cq_num, mailbox ? 0 : 1, MLX4_CMD_HW2SW_CQ, |
f9baff50 | 166 | MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED); |
225c7b1f RD |
167 | } |
168 | ||
3fdcb97f EC |
169 | int mlx4_cq_modify(struct mlx4_dev *dev, struct mlx4_cq *cq, |
170 | u16 count, u16 period) | |
171 | { | |
172 | struct mlx4_cmd_mailbox *mailbox; | |
173 | struct mlx4_cq_context *cq_context; | |
174 | int err; | |
175 | ||
176 | mailbox = mlx4_alloc_cmd_mailbox(dev); | |
177 | if (IS_ERR(mailbox)) | |
178 | return PTR_ERR(mailbox); | |
179 | ||
180 | cq_context = mailbox->buf; | |
3fdcb97f EC |
181 | cq_context->cq_max_count = cpu_to_be16(count); |
182 | cq_context->cq_period = cpu_to_be16(period); | |
183 | ||
184 | err = mlx4_MODIFY_CQ(dev, mailbox, cq->cqn, 1); | |
185 | ||
186 | mlx4_free_cmd_mailbox(dev, mailbox); | |
187 | return err; | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(mlx4_cq_modify); | |
190 | ||
bbf8eed1 VS |
191 | int mlx4_cq_resize(struct mlx4_dev *dev, struct mlx4_cq *cq, |
192 | int entries, struct mlx4_mtt *mtt) | |
193 | { | |
194 | struct mlx4_cmd_mailbox *mailbox; | |
195 | struct mlx4_cq_context *cq_context; | |
196 | u64 mtt_addr; | |
197 | int err; | |
198 | ||
199 | mailbox = mlx4_alloc_cmd_mailbox(dev); | |
200 | if (IS_ERR(mailbox)) | |
201 | return PTR_ERR(mailbox); | |
202 | ||
203 | cq_context = mailbox->buf; | |
bbf8eed1 VS |
204 | cq_context->logsize_usrpage = cpu_to_be32(ilog2(entries) << 24); |
205 | cq_context->log_page_size = mtt->page_shift - 12; | |
206 | mtt_addr = mlx4_mtt_addr(dev, mtt); | |
207 | cq_context->mtt_base_addr_h = mtt_addr >> 32; | |
208 | cq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff); | |
209 | ||
f5b3a096 | 210 | err = mlx4_MODIFY_CQ(dev, mailbox, cq->cqn, 0); |
bbf8eed1 VS |
211 | |
212 | mlx4_free_cmd_mailbox(dev, mailbox); | |
213 | return err; | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(mlx4_cq_resize); | |
216 | ||
c82e9aa0 | 217 | int __mlx4_cq_alloc_icm(struct mlx4_dev *dev, int *cqn) |
d7233386 JM |
218 | { |
219 | struct mlx4_priv *priv = mlx4_priv(dev); | |
220 | struct mlx4_cq_table *cq_table = &priv->cq_table; | |
221 | int err; | |
222 | ||
223 | *cqn = mlx4_bitmap_alloc(&cq_table->bitmap); | |
224 | if (*cqn == -1) | |
225 | return -ENOMEM; | |
226 | ||
8900b894 | 227 | err = mlx4_table_get(dev, &cq_table->table, *cqn); |
d7233386 JM |
228 | if (err) |
229 | goto err_out; | |
230 | ||
8900b894 | 231 | err = mlx4_table_get(dev, &cq_table->cmpt_table, *cqn); |
d7233386 JM |
232 | if (err) |
233 | goto err_put; | |
234 | return 0; | |
235 | ||
236 | err_put: | |
237 | mlx4_table_put(dev, &cq_table->table, *cqn); | |
238 | ||
239 | err_out: | |
7c6d74d2 | 240 | mlx4_bitmap_free(&cq_table->bitmap, *cqn, MLX4_NO_RR); |
d7233386 JM |
241 | return err; |
242 | } | |
243 | ||
244 | static int mlx4_cq_alloc_icm(struct mlx4_dev *dev, int *cqn) | |
245 | { | |
246 | u64 out_param; | |
247 | int err; | |
248 | ||
249 | if (mlx4_is_mfunc(dev)) { | |
250 | err = mlx4_cmd_imm(dev, 0, &out_param, RES_CQ, | |
251 | RES_OP_RESERVE_AND_MAP, MLX4_CMD_ALLOC_RES, | |
252 | MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED); | |
253 | if (err) | |
254 | return err; | |
255 | else { | |
256 | *cqn = get_param_l(&out_param); | |
257 | return 0; | |
258 | } | |
259 | } | |
260 | return __mlx4_cq_alloc_icm(dev, cqn); | |
261 | } | |
262 | ||
c82e9aa0 | 263 | void __mlx4_cq_free_icm(struct mlx4_dev *dev, int cqn) |
d7233386 JM |
264 | { |
265 | struct mlx4_priv *priv = mlx4_priv(dev); | |
266 | struct mlx4_cq_table *cq_table = &priv->cq_table; | |
267 | ||
268 | mlx4_table_put(dev, &cq_table->cmpt_table, cqn); | |
269 | mlx4_table_put(dev, &cq_table->table, cqn); | |
7c6d74d2 | 270 | mlx4_bitmap_free(&cq_table->bitmap, cqn, MLX4_NO_RR); |
d7233386 JM |
271 | } |
272 | ||
273 | static void mlx4_cq_free_icm(struct mlx4_dev *dev, int cqn) | |
274 | { | |
e7dbeba8 | 275 | u64 in_param = 0; |
d7233386 JM |
276 | int err; |
277 | ||
278 | if (mlx4_is_mfunc(dev)) { | |
279 | set_param_l(&in_param, cqn); | |
280 | err = mlx4_cmd(dev, in_param, RES_CQ, RES_OP_RESERVE_AND_MAP, | |
281 | MLX4_CMD_FREE_RES, | |
282 | MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED); | |
283 | if (err) | |
284 | mlx4_warn(dev, "Failed freeing cq:%d\n", cqn); | |
285 | } else | |
286 | __mlx4_cq_free_icm(dev, cqn); | |
287 | } | |
288 | ||
ec693d47 AV |
289 | int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, |
290 | struct mlx4_mtt *mtt, struct mlx4_uar *uar, u64 db_rec, | |
291 | struct mlx4_cq *cq, unsigned vector, int collapsed, | |
292 | int timestamp_en) | |
225c7b1f RD |
293 | { |
294 | struct mlx4_priv *priv = mlx4_priv(dev); | |
295 | struct mlx4_cq_table *cq_table = &priv->cq_table; | |
296 | struct mlx4_cmd_mailbox *mailbox; | |
297 | struct mlx4_cq_context *cq_context; | |
298 | u64 mtt_addr; | |
299 | int err; | |
300 | ||
c66fa19c | 301 | if (vector >= dev->caps.num_comp_vectors) |
b8dd786f YP |
302 | return -EINVAL; |
303 | ||
304 | cq->vector = vector; | |
305 | ||
d7233386 | 306 | err = mlx4_cq_alloc_icm(dev, &cq->cqn); |
225c7b1f | 307 | if (err) |
d7233386 | 308 | return err; |
225c7b1f | 309 | |
291c566a | 310 | spin_lock(&cq_table->lock); |
225c7b1f | 311 | err = radix_tree_insert(&cq_table->tree, cq->cqn, cq); |
291c566a | 312 | spin_unlock(&cq_table->lock); |
225c7b1f | 313 | if (err) |
d7233386 | 314 | goto err_icm; |
225c7b1f RD |
315 | |
316 | mailbox = mlx4_alloc_cmd_mailbox(dev); | |
317 | if (IS_ERR(mailbox)) { | |
318 | err = PTR_ERR(mailbox); | |
319 | goto err_radix; | |
320 | } | |
321 | ||
322 | cq_context = mailbox->buf; | |
e463c7b1 | 323 | cq_context->flags = cpu_to_be32(!!collapsed << 18); |
ec693d47 AV |
324 | if (timestamp_en) |
325 | cq_context->flags |= cpu_to_be32(1 << 19); | |
326 | ||
85743f1e HN |
327 | cq_context->logsize_usrpage = |
328 | cpu_to_be32((ilog2(nent) << 24) | | |
329 | mlx4_to_hw_uar_index(dev, uar->index)); | |
c66fa19c | 330 | cq_context->comp_eqn = priv->eq_table.eq[MLX4_CQ_TO_EQ_VECTOR(vector)].eqn; |
225c7b1f RD |
331 | cq_context->log_page_size = mtt->page_shift - MLX4_ICM_PAGE_SHIFT; |
332 | ||
333 | mtt_addr = mlx4_mtt_addr(dev, mtt); | |
334 | cq_context->mtt_base_addr_h = mtt_addr >> 32; | |
335 | cq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff); | |
336 | cq_context->db_rec_addr = cpu_to_be64(db_rec); | |
337 | ||
338 | err = mlx4_SW2HW_CQ(dev, mailbox, cq->cqn); | |
339 | mlx4_free_cmd_mailbox(dev, mailbox); | |
340 | if (err) | |
341 | goto err_radix; | |
342 | ||
343 | cq->cons_index = 0; | |
344 | cq->arm_sn = 1; | |
345 | cq->uar = uar; | |
346 | atomic_set(&cq->refcount, 1); | |
347 | init_completion(&cq->free); | |
3dca0f42 MB |
348 | cq->comp = mlx4_add_cq_to_tasklet; |
349 | cq->tasklet_ctx.priv = | |
c66fa19c | 350 | &priv->eq_table.eq[MLX4_CQ_TO_EQ_VECTOR(vector)].tasklet_ctx; |
3dca0f42 MB |
351 | INIT_LIST_HEAD(&cq->tasklet_ctx.list); |
352 | ||
225c7b1f | 353 | |
c66fa19c | 354 | cq->irq = priv->eq_table.eq[MLX4_CQ_TO_EQ_VECTOR(vector)].irq; |
225c7b1f RD |
355 | return 0; |
356 | ||
357 | err_radix: | |
291c566a | 358 | spin_lock(&cq_table->lock); |
225c7b1f | 359 | radix_tree_delete(&cq_table->tree, cq->cqn); |
291c566a | 360 | spin_unlock(&cq_table->lock); |
225c7b1f | 361 | |
d7233386 JM |
362 | err_icm: |
363 | mlx4_cq_free_icm(dev, cq->cqn); | |
225c7b1f RD |
364 | |
365 | return err; | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(mlx4_cq_alloc); | |
368 | ||
369 | void mlx4_cq_free(struct mlx4_dev *dev, struct mlx4_cq *cq) | |
370 | { | |
371 | struct mlx4_priv *priv = mlx4_priv(dev); | |
372 | struct mlx4_cq_table *cq_table = &priv->cq_table; | |
373 | int err; | |
374 | ||
375 | err = mlx4_HW2SW_CQ(dev, NULL, cq->cqn); | |
376 | if (err) | |
377 | mlx4_warn(dev, "HW2SW_CQ failed (%d) for CQN %06x\n", err, cq->cqn); | |
378 | ||
291c566a JM |
379 | spin_lock(&cq_table->lock); |
380 | radix_tree_delete(&cq_table->tree, cq->cqn); | |
381 | spin_unlock(&cq_table->lock); | |
382 | ||
c66fa19c | 383 | synchronize_irq(priv->eq_table.eq[MLX4_CQ_TO_EQ_VECTOR(cq->vector)].irq); |
6d90aa5c MB |
384 | if (priv->eq_table.eq[MLX4_CQ_TO_EQ_VECTOR(cq->vector)].irq != |
385 | priv->eq_table.eq[MLX4_EQ_ASYNC].irq) | |
386 | synchronize_irq(priv->eq_table.eq[MLX4_EQ_ASYNC].irq); | |
225c7b1f | 387 | |
225c7b1f RD |
388 | if (atomic_dec_and_test(&cq->refcount)) |
389 | complete(&cq->free); | |
390 | wait_for_completion(&cq->free); | |
391 | ||
d7233386 | 392 | mlx4_cq_free_icm(dev, cq->cqn); |
225c7b1f RD |
393 | } |
394 | EXPORT_SYMBOL_GPL(mlx4_cq_free); | |
395 | ||
3d73c288 | 396 | int mlx4_init_cq_table(struct mlx4_dev *dev) |
225c7b1f RD |
397 | { |
398 | struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table; | |
399 | int err; | |
400 | ||
401 | spin_lock_init(&cq_table->lock); | |
402 | INIT_RADIX_TREE(&cq_table->tree, GFP_ATOMIC); | |
d7233386 JM |
403 | if (mlx4_is_slave(dev)) |
404 | return 0; | |
225c7b1f RD |
405 | |
406 | err = mlx4_bitmap_init(&cq_table->bitmap, dev->caps.num_cqs, | |
93fc9e1b | 407 | dev->caps.num_cqs - 1, dev->caps.reserved_cqs, 0); |
225c7b1f RD |
408 | if (err) |
409 | return err; | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | void mlx4_cleanup_cq_table(struct mlx4_dev *dev) | |
415 | { | |
d7233386 JM |
416 | if (mlx4_is_slave(dev)) |
417 | return; | |
225c7b1f RD |
418 | /* Nothing to do to clean up radix_tree */ |
419 | mlx4_bitmap_cleanup(&mlx4_priv(dev)->cq_table.bitmap); | |
420 | } |