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net/xfrm/xfrm_output.c: move EXPORT_SYMBOL
[deliverable/linux.git] / drivers / net / ethernet / mellanox / mlx5 / core / pagealloc.c
1 /*
2 * Copyright (c) 2013, Mellanox Technologies inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <asm-generic/kmap_types.h>
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/mlx5/driver.h>
37 #include <linux/mlx5/cmd.h>
38 #include "mlx5_core.h"
39
40 enum {
41 MLX5_PAGES_CANT_GIVE = 0,
42 MLX5_PAGES_GIVE = 1,
43 MLX5_PAGES_TAKE = 2
44 };
45
46 enum {
47 MLX5_BOOT_PAGES = 1,
48 MLX5_INIT_PAGES = 2,
49 MLX5_POST_INIT_PAGES = 3
50 };
51
52 struct mlx5_pages_req {
53 struct mlx5_core_dev *dev;
54 u32 func_id;
55 s32 npages;
56 struct work_struct work;
57 };
58
59 struct fw_page {
60 struct rb_node rb_node;
61 u64 addr;
62 struct page *page;
63 u16 func_id;
64 unsigned long bitmask;
65 struct list_head list;
66 unsigned free_count;
67 };
68
69 struct mlx5_query_pages_inbox {
70 struct mlx5_inbox_hdr hdr;
71 u8 rsvd[8];
72 };
73
74 struct mlx5_query_pages_outbox {
75 struct mlx5_outbox_hdr hdr;
76 __be16 rsvd;
77 __be16 func_id;
78 __be32 num_pages;
79 };
80
81 struct mlx5_manage_pages_inbox {
82 struct mlx5_inbox_hdr hdr;
83 __be16 rsvd;
84 __be16 func_id;
85 __be32 num_entries;
86 __be64 pas[0];
87 };
88
89 struct mlx5_manage_pages_outbox {
90 struct mlx5_outbox_hdr hdr;
91 __be32 num_entries;
92 u8 rsvd[4];
93 __be64 pas[0];
94 };
95
96 enum {
97 MAX_RECLAIM_TIME_MSECS = 5000,
98 };
99
100 enum {
101 MLX5_MAX_RECLAIM_TIME_MILI = 5000,
102 MLX5_NUM_4K_IN_PAGE = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
103 };
104
105 static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
106 {
107 struct rb_root *root = &dev->priv.page_root;
108 struct rb_node **new = &root->rb_node;
109 struct rb_node *parent = NULL;
110 struct fw_page *nfp;
111 struct fw_page *tfp;
112 int i;
113
114 while (*new) {
115 parent = *new;
116 tfp = rb_entry(parent, struct fw_page, rb_node);
117 if (tfp->addr < addr)
118 new = &parent->rb_left;
119 else if (tfp->addr > addr)
120 new = &parent->rb_right;
121 else
122 return -EEXIST;
123 }
124
125 nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
126 if (!nfp)
127 return -ENOMEM;
128
129 nfp->addr = addr;
130 nfp->page = page;
131 nfp->func_id = func_id;
132 nfp->free_count = MLX5_NUM_4K_IN_PAGE;
133 for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
134 set_bit(i, &nfp->bitmask);
135
136 rb_link_node(&nfp->rb_node, parent, new);
137 rb_insert_color(&nfp->rb_node, root);
138 list_add(&nfp->list, &dev->priv.free_list);
139
140 return 0;
141 }
142
143 static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
144 {
145 struct rb_root *root = &dev->priv.page_root;
146 struct rb_node *tmp = root->rb_node;
147 struct fw_page *result = NULL;
148 struct fw_page *tfp;
149
150 while (tmp) {
151 tfp = rb_entry(tmp, struct fw_page, rb_node);
152 if (tfp->addr < addr) {
153 tmp = tmp->rb_left;
154 } else if (tfp->addr > addr) {
155 tmp = tmp->rb_right;
156 } else {
157 result = tfp;
158 break;
159 }
160 }
161
162 return result;
163 }
164
165 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
166 s32 *npages, int boot)
167 {
168 struct mlx5_query_pages_inbox in;
169 struct mlx5_query_pages_outbox out;
170 int err;
171
172 memset(&in, 0, sizeof(in));
173 memset(&out, 0, sizeof(out));
174 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
175 in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_PAGES);
176
177 err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
178 if (err)
179 return err;
180
181 if (out.hdr.status)
182 return mlx5_cmd_status_to_err(&out.hdr);
183
184 *npages = be32_to_cpu(out.num_pages);
185 *func_id = be16_to_cpu(out.func_id);
186
187 return err;
188 }
189
190 static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
191 {
192 struct fw_page *fp;
193 unsigned n;
194
195 if (list_empty(&dev->priv.free_list))
196 return -ENOMEM;
197
198 fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
199 n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
200 if (n >= MLX5_NUM_4K_IN_PAGE) {
201 mlx5_core_warn(dev, "alloc 4k bug\n");
202 return -ENOENT;
203 }
204 clear_bit(n, &fp->bitmask);
205 fp->free_count--;
206 if (!fp->free_count)
207 list_del(&fp->list);
208
209 *addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
210
211 return 0;
212 }
213
214 static void free_4k(struct mlx5_core_dev *dev, u64 addr)
215 {
216 struct fw_page *fwp;
217 int n;
218
219 fwp = find_fw_page(dev, addr & PAGE_MASK);
220 if (!fwp) {
221 mlx5_core_warn(dev, "page not found\n");
222 return;
223 }
224
225 n = (addr & ~PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
226 fwp->free_count++;
227 set_bit(n, &fwp->bitmask);
228 if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
229 rb_erase(&fwp->rb_node, &dev->priv.page_root);
230 if (fwp->free_count != 1)
231 list_del(&fwp->list);
232 dma_unmap_page(&dev->pdev->dev, addr & PAGE_MASK, PAGE_SIZE,
233 DMA_BIDIRECTIONAL);
234 __free_page(fwp->page);
235 kfree(fwp);
236 } else if (fwp->free_count == 1) {
237 list_add(&fwp->list, &dev->priv.free_list);
238 }
239 }
240
241 static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
242 {
243 struct page *page;
244 u64 addr;
245 int err;
246
247 page = alloc_page(GFP_HIGHUSER);
248 if (!page) {
249 mlx5_core_warn(dev, "failed to allocate page\n");
250 return -ENOMEM;
251 }
252 addr = dma_map_page(&dev->pdev->dev, page, 0,
253 PAGE_SIZE, DMA_BIDIRECTIONAL);
254 if (dma_mapping_error(&dev->pdev->dev, addr)) {
255 mlx5_core_warn(dev, "failed dma mapping page\n");
256 err = -ENOMEM;
257 goto out_alloc;
258 }
259 err = insert_page(dev, addr, page, func_id);
260 if (err) {
261 mlx5_core_err(dev, "failed to track allocated page\n");
262 goto out_mapping;
263 }
264
265 return 0;
266
267 out_mapping:
268 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
269
270 out_alloc:
271 __free_page(page);
272
273 return err;
274 }
275 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
276 int notify_fail)
277 {
278 struct mlx5_manage_pages_inbox *in;
279 struct mlx5_manage_pages_outbox out;
280 struct mlx5_manage_pages_inbox *nin;
281 int inlen;
282 u64 addr;
283 int err;
284 int i;
285
286 inlen = sizeof(*in) + npages * sizeof(in->pas[0]);
287 in = mlx5_vzalloc(inlen);
288 if (!in) {
289 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
290 return -ENOMEM;
291 }
292 memset(&out, 0, sizeof(out));
293
294 for (i = 0; i < npages; i++) {
295 retry:
296 err = alloc_4k(dev, &addr);
297 if (err) {
298 if (err == -ENOMEM)
299 err = alloc_system_page(dev, func_id);
300 if (err)
301 goto out_4k;
302
303 goto retry;
304 }
305 in->pas[i] = cpu_to_be64(addr);
306 }
307
308 in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
309 in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
310 in->func_id = cpu_to_be16(func_id);
311 in->num_entries = cpu_to_be32(npages);
312 err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
313 if (err) {
314 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n", func_id, npages, err);
315 goto out_alloc;
316 }
317 dev->priv.fw_pages += npages;
318
319 if (out.hdr.status) {
320 err = mlx5_cmd_status_to_err(&out.hdr);
321 if (err) {
322 mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n", func_id, npages, out.hdr.status);
323 goto out_alloc;
324 }
325 }
326
327 mlx5_core_dbg(dev, "err %d\n", err);
328
329 goto out_free;
330
331 out_alloc:
332 if (notify_fail) {
333 nin = kzalloc(sizeof(*nin), GFP_KERNEL);
334 if (!nin) {
335 mlx5_core_warn(dev, "allocation failed\n");
336 goto out_4k;
337 }
338 memset(&out, 0, sizeof(out));
339 nin->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
340 nin->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
341 if (mlx5_cmd_exec(dev, nin, sizeof(*nin), &out, sizeof(out)))
342 mlx5_core_warn(dev, "page notify failed\n");
343 kfree(nin);
344 }
345
346 out_4k:
347 for (i--; i >= 0; i--)
348 free_4k(dev, be64_to_cpu(in->pas[i]));
349 out_free:
350 mlx5_vfree(in);
351 return err;
352 }
353
354 static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
355 int *nclaimed)
356 {
357 struct mlx5_manage_pages_inbox in;
358 struct mlx5_manage_pages_outbox *out;
359 int num_claimed;
360 int outlen;
361 u64 addr;
362 int err;
363 int i;
364
365 if (nclaimed)
366 *nclaimed = 0;
367
368 memset(&in, 0, sizeof(in));
369 outlen = sizeof(*out) + npages * sizeof(out->pas[0]);
370 out = mlx5_vzalloc(outlen);
371 if (!out)
372 return -ENOMEM;
373
374 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
375 in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
376 in.func_id = cpu_to_be16(func_id);
377 in.num_entries = cpu_to_be32(npages);
378 mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
379 err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
380 if (err) {
381 mlx5_core_err(dev, "failed recliaming pages\n");
382 goto out_free;
383 }
384 dev->priv.fw_pages -= npages;
385
386 if (out->hdr.status) {
387 err = mlx5_cmd_status_to_err(&out->hdr);
388 goto out_free;
389 }
390
391 num_claimed = be32_to_cpu(out->num_entries);
392 if (nclaimed)
393 *nclaimed = num_claimed;
394
395 for (i = 0; i < num_claimed; i++) {
396 addr = be64_to_cpu(out->pas[i]);
397 free_4k(dev, addr);
398 }
399
400 out_free:
401 mlx5_vfree(out);
402 return err;
403 }
404
405 static void pages_work_handler(struct work_struct *work)
406 {
407 struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
408 struct mlx5_core_dev *dev = req->dev;
409 int err = 0;
410
411 if (req->npages < 0)
412 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
413 else if (req->npages > 0)
414 err = give_pages(dev, req->func_id, req->npages, 1);
415
416 if (err)
417 mlx5_core_warn(dev, "%s fail %d\n", req->npages < 0 ?
418 "reclaim" : "give", err);
419
420 kfree(req);
421 }
422
423 void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
424 s32 npages)
425 {
426 struct mlx5_pages_req *req;
427
428 req = kzalloc(sizeof(*req), GFP_ATOMIC);
429 if (!req) {
430 mlx5_core_warn(dev, "failed to allocate pages request\n");
431 return;
432 }
433
434 req->dev = dev;
435 req->func_id = func_id;
436 req->npages = npages;
437 INIT_WORK(&req->work, pages_work_handler);
438 queue_work(dev->priv.pg_wq, &req->work);
439 }
440
441 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
442 {
443 u16 uninitialized_var(func_id);
444 s32 uninitialized_var(npages);
445 int err;
446
447 err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
448 if (err)
449 return err;
450
451 mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
452 npages, boot ? "boot" : "init", func_id);
453
454 return give_pages(dev, func_id, npages, 0);
455 }
456
457 enum {
458 MLX5_BLKS_FOR_RECLAIM_PAGES = 12
459 };
460
461 static int optimal_reclaimed_pages(void)
462 {
463 struct mlx5_cmd_prot_block *block;
464 struct mlx5_cmd_layout *lay;
465 int ret;
466
467 ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
468 sizeof(struct mlx5_manage_pages_outbox)) /
469 FIELD_SIZEOF(struct mlx5_manage_pages_outbox, pas[0]);
470
471 return ret;
472 }
473
474 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
475 {
476 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
477 struct fw_page *fwp;
478 struct rb_node *p;
479 int nclaimed = 0;
480 int err;
481
482 do {
483 p = rb_first(&dev->priv.page_root);
484 if (p) {
485 fwp = rb_entry(p, struct fw_page, rb_node);
486 err = reclaim_pages(dev, fwp->func_id,
487 optimal_reclaimed_pages(),
488 &nclaimed);
489 if (err) {
490 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n", err);
491 return err;
492 }
493 if (nclaimed)
494 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
495 }
496 if (time_after(jiffies, end)) {
497 mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
498 break;
499 }
500 } while (p);
501
502 return 0;
503 }
504
505 void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
506 {
507 dev->priv.page_root = RB_ROOT;
508 INIT_LIST_HEAD(&dev->priv.free_list);
509 }
510
511 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
512 {
513 /* nothing */
514 }
515
516 int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
517 {
518 dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
519 if (!dev->priv.pg_wq)
520 return -ENOMEM;
521
522 return 0;
523 }
524
525 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
526 {
527 destroy_workqueue(dev->priv.pg_wq);
528 }
Linux kernel - Deliverables
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