1 /*
2 * Copyright (c) 2013-2015, Mellanox Technologies. 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 <linux/highmem.h>
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/delay.h>
37 #include <linux/mlx5/driver.h>
38 #include <linux/xarray.h>
39 #include "mlx5_core.h"
40 #include "lib/eq.h"
41
42 enum {
43 MLX5_PAGES_CANT_GIVE = 0,
44 MLX5_PAGES_GIVE = 1,
45 MLX5_PAGES_TAKE = 2
46 };
47
48 struct mlx5_pages_req {
49 struct mlx5_core_dev *dev;
50 u16 func_id;
51 u8 ec_function;
52 s32 npages;
53 struct work_struct work;
54 u8 release_all;
55 };
56
57 struct fw_page {
58 struct rb_node rb_node;
59 u64 addr;
60 struct page *page;
61 u32 function;
62 unsigned long bitmask;
63 struct list_head list;
64 unsigned int free_count;
65 };
66
67 enum {
68 MAX_RECLAIM_TIME_MSECS = 5000,
69 MAX_RECLAIM_VFS_PAGES_TIME_MSECS = 2 * 1000 * 60,
70 };
71
72 enum {
73 MLX5_MAX_RECLAIM_TIME_MILI = 5000,
74 MLX5_NUM_4K_IN_PAGE = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
75 };
76
get_function(u16 func_id,bool ec_function)77 static u32 get_function(u16 func_id, bool ec_function)
78 {
79 return (u32)func_id | (ec_function << 16);
80 }
81
page_root_per_function(struct mlx5_core_dev * dev,u32 function)82 static struct rb_root *page_root_per_function(struct mlx5_core_dev *dev, u32 function)
83 {
84 struct rb_root *root;
85 int err;
86
87 root = xa_load(&dev->priv.page_root_xa, function);
88 if (root)
89 return root;
90
91 root = kzalloc(sizeof(*root), GFP_KERNEL);
92 if (!root)
93 return ERR_PTR(-ENOMEM);
94
95 err = xa_insert(&dev->priv.page_root_xa, function, root, GFP_KERNEL);
96 if (err) {
97 kfree(root);
98 return ERR_PTR(err);
99 }
100
101 *root = RB_ROOT;
102
103 return root;
104 }
105
insert_page(struct mlx5_core_dev * dev,u64 addr,struct page * page,u32 function)106 static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u32 function)
107 {
108 struct rb_node *parent = NULL;
109 struct rb_root *root;
110 struct rb_node **new;
111 struct fw_page *nfp;
112 struct fw_page *tfp;
113 int i;
114
115 root = page_root_per_function(dev, function);
116 if (IS_ERR(root))
117 return PTR_ERR(root);
118
119 new = &root->rb_node;
120
121 while (*new) {
122 parent = *new;
123 tfp = rb_entry(parent, struct fw_page, rb_node);
124 if (tfp->addr < addr)
125 new = &parent->rb_left;
126 else if (tfp->addr > addr)
127 new = &parent->rb_right;
128 else
129 return -EEXIST;
130 }
131
132 nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
133 if (!nfp)
134 return -ENOMEM;
135
136 nfp->addr = addr;
137 nfp->page = page;
138 nfp->function = function;
139 nfp->free_count = MLX5_NUM_4K_IN_PAGE;
140 for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
141 set_bit(i, &nfp->bitmask);
142
143 rb_link_node(&nfp->rb_node, parent, new);
144 rb_insert_color(&nfp->rb_node, root);
145 list_add(&nfp->list, &dev->priv.free_list);
146
147 return 0;
148 }
149
find_fw_page(struct mlx5_core_dev * dev,u64 addr,u32 function)150 static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr,
151 u32 function)
152 {
153 struct fw_page *result = NULL;
154 struct rb_root *root;
155 struct rb_node *tmp;
156 struct fw_page *tfp;
157
158 root = xa_load(&dev->priv.page_root_xa, function);
159 if (WARN_ON_ONCE(!root))
160 return NULL;
161
162 tmp = root->rb_node;
163
164 while (tmp) {
165 tfp = rb_entry(tmp, struct fw_page, rb_node);
166 if (tfp->addr < addr) {
167 tmp = tmp->rb_left;
168 } else if (tfp->addr > addr) {
169 tmp = tmp->rb_right;
170 } else {
171 result = tfp;
172 break;
173 }
174 }
175
176 return result;
177 }
178
mlx5_cmd_query_pages(struct mlx5_core_dev * dev,u16 * func_id,s32 * npages,int boot)179 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
180 s32 *npages, int boot)
181 {
182 u32 out[MLX5_ST_SZ_DW(query_pages_out)] = {};
183 u32 in[MLX5_ST_SZ_DW(query_pages_in)] = {};
184 int err;
185
186 MLX5_SET(query_pages_in, in, opcode, MLX5_CMD_OP_QUERY_PAGES);
187 MLX5_SET(query_pages_in, in, op_mod, boot ?
188 MLX5_QUERY_PAGES_IN_OP_MOD_BOOT_PAGES :
189 MLX5_QUERY_PAGES_IN_OP_MOD_INIT_PAGES);
190 MLX5_SET(query_pages_in, in, embedded_cpu_function, mlx5_core_is_ecpf(dev));
191
192 err = mlx5_cmd_exec_inout(dev, query_pages, in, out);
193 if (err)
194 return err;
195
196 *npages = MLX5_GET(query_pages_out, out, num_pages);
197 *func_id = MLX5_GET(query_pages_out, out, function_id);
198
199 return err;
200 }
201
alloc_4k(struct mlx5_core_dev * dev,u64 * addr,u32 function)202 static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr, u32 function)
203 {
204 struct fw_page *fp = NULL;
205 struct fw_page *iter;
206 unsigned n;
207
208 list_for_each_entry(iter, &dev->priv.free_list, list) {
209 if (iter->function != function)
210 continue;
211 fp = iter;
212 }
213
214 if (list_empty(&dev->priv.free_list) || !fp)
215 return -ENOMEM;
216
217 n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
218 if (n >= MLX5_NUM_4K_IN_PAGE) {
219 mlx5_core_warn(dev, "alloc 4k bug\n");
220 return -ENOENT;
221 }
222 clear_bit(n, &fp->bitmask);
223 fp->free_count--;
224 if (!fp->free_count)
225 list_del(&fp->list);
226
227 *addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
228
229 return 0;
230 }
231
232 #define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
233
free_fwp(struct mlx5_core_dev * dev,struct fw_page * fwp,bool in_free_list)234 static void free_fwp(struct mlx5_core_dev *dev, struct fw_page *fwp,
235 bool in_free_list)
236 {
237 struct rb_root *root;
238
239 root = xa_load(&dev->priv.page_root_xa, fwp->function);
240 if (WARN_ON_ONCE(!root))
241 return;
242
243 rb_erase(&fwp->rb_node, root);
244 if (in_free_list)
245 list_del(&fwp->list);
246 dma_unmap_page(mlx5_core_dma_dev(dev), fwp->addr & MLX5_U64_4K_PAGE_MASK,
247 PAGE_SIZE, DMA_BIDIRECTIONAL);
248 __free_page(fwp->page);
249 kfree(fwp);
250 }
251
free_4k(struct mlx5_core_dev * dev,u64 addr,u32 function)252 static void free_4k(struct mlx5_core_dev *dev, u64 addr, u32 function)
253 {
254 struct fw_page *fwp;
255 int n;
256
257 fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK, function);
258 if (!fwp) {
259 mlx5_core_warn_rl(dev, "page not found\n");
260 return;
261 }
262 n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
263 fwp->free_count++;
264 set_bit(n, &fwp->bitmask);
265 if (fwp->free_count == MLX5_NUM_4K_IN_PAGE)
266 free_fwp(dev, fwp, fwp->free_count != 1);
267 else if (fwp->free_count == 1)
268 list_add(&fwp->list, &dev->priv.free_list);
269 }
270
alloc_system_page(struct mlx5_core_dev * dev,u32 function)271 static int alloc_system_page(struct mlx5_core_dev *dev, u32 function)
272 {
273 struct device *device = mlx5_core_dma_dev(dev);
274 int nid = dev_to_node(device);
275 struct page *page;
276 u64 zero_addr = 1;
277 u64 addr;
278 int err;
279
280 page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
281 if (!page) {
282 mlx5_core_warn(dev, "failed to allocate page\n");
283 return -ENOMEM;
284 }
285 map:
286 addr = dma_map_page(device, page, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
287 if (dma_mapping_error(device, addr)) {
288 mlx5_core_warn(dev, "failed dma mapping page\n");
289 err = -ENOMEM;
290 goto err_mapping;
291 }
292
293 /* Firmware doesn't support page with physical address 0 */
294 if (addr == 0) {
295 zero_addr = addr;
296 goto map;
297 }
298
299 err = insert_page(dev, addr, page, function);
300 if (err) {
301 mlx5_core_err(dev, "failed to track allocated page\n");
302 dma_unmap_page(device, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
303 }
304
305 err_mapping:
306 if (err)
307 __free_page(page);
308
309 if (zero_addr == 0)
310 dma_unmap_page(device, zero_addr, PAGE_SIZE,
311 DMA_BIDIRECTIONAL);
312
313 return err;
314 }
315
page_notify_fail(struct mlx5_core_dev * dev,u16 func_id,bool ec_function)316 static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id,
317 bool ec_function)
318 {
319 u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {};
320 int err;
321
322 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
323 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_CANT_GIVE);
324 MLX5_SET(manage_pages_in, in, function_id, func_id);
325 MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
326
327 err = mlx5_cmd_exec_in(dev, manage_pages, in);
328 if (err)
329 mlx5_core_warn(dev, "page notify failed func_id(%d) err(%d)\n",
330 func_id, err);
331 }
332
give_pages(struct mlx5_core_dev * dev,u16 func_id,int npages,int notify_fail,bool ec_function)333 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
334 int notify_fail, bool ec_function)
335 {
336 u32 function = get_function(func_id, ec_function);
337 u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
338 int inlen = MLX5_ST_SZ_BYTES(manage_pages_in);
339 u64 addr;
340 int err;
341 u32 *in;
342 int i;
343
344 inlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_in, pas[0]);
345 in = kvzalloc(inlen, GFP_KERNEL);
346 if (!in) {
347 err = -ENOMEM;
348 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
349 goto out_free;
350 }
351
352 for (i = 0; i < npages; i++) {
353 retry:
354 err = alloc_4k(dev, &addr, function);
355 if (err) {
356 if (err == -ENOMEM)
357 err = alloc_system_page(dev, function);
358 if (err)
359 goto out_4k;
360
361 goto retry;
362 }
363 MLX5_ARRAY_SET64(manage_pages_in, in, pas, i, addr);
364 }
365
366 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
367 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_GIVE);
368 MLX5_SET(manage_pages_in, in, function_id, func_id);
369 MLX5_SET(manage_pages_in, in, input_num_entries, npages);
370 MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
371
372 err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
373 if (err) {
374 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
375 func_id, npages, err);
376 goto out_4k;
377 }
378
379 dev->priv.fw_pages += npages;
380 if (func_id)
381 dev->priv.vfs_pages += npages;
382 else if (mlx5_core_is_ecpf(dev) && !ec_function)
383 dev->priv.host_pf_pages += npages;
384
385 mlx5_core_dbg(dev, "npages %d, ec_function %d, func_id 0x%x, err %d\n",
386 npages, ec_function, func_id, err);
387
388 kvfree(in);
389 return 0;
390
391 out_4k:
392 for (i--; i >= 0; i--)
393 free_4k(dev, MLX5_GET64(manage_pages_in, in, pas[i]), function);
394 out_free:
395 kvfree(in);
396 if (notify_fail)
397 page_notify_fail(dev, func_id, ec_function);
398 return err;
399 }
400
release_all_pages(struct mlx5_core_dev * dev,u16 func_id,bool ec_function)401 static void release_all_pages(struct mlx5_core_dev *dev, u16 func_id,
402 bool ec_function)
403 {
404 u32 function = get_function(func_id, ec_function);
405 struct rb_root *root;
406 struct rb_node *p;
407 int npages = 0;
408
409 root = xa_load(&dev->priv.page_root_xa, function);
410 if (WARN_ON_ONCE(!root))
411 return;
412
413 p = rb_first(root);
414 while (p) {
415 struct fw_page *fwp = rb_entry(p, struct fw_page, rb_node);
416
417 p = rb_next(p);
418 npages += (MLX5_NUM_4K_IN_PAGE - fwp->free_count);
419 free_fwp(dev, fwp, fwp->free_count);
420 }
421
422 dev->priv.fw_pages -= npages;
423 if (func_id)
424 dev->priv.vfs_pages -= npages;
425 else if (mlx5_core_is_ecpf(dev) && !ec_function)
426 dev->priv.host_pf_pages -= npages;
427
428 mlx5_core_dbg(dev, "npages %d, ec_function %d, func_id 0x%x\n",
429 npages, ec_function, func_id);
430 }
431
fwp_fill_manage_pages_out(struct fw_page * fwp,u32 * out,u32 index,u32 npages)432 static u32 fwp_fill_manage_pages_out(struct fw_page *fwp, u32 *out, u32 index,
433 u32 npages)
434 {
435 u32 pages_set = 0;
436 unsigned int n;
437
438 for_each_clear_bit(n, &fwp->bitmask, MLX5_NUM_4K_IN_PAGE) {
439 MLX5_ARRAY_SET64(manage_pages_out, out, pas, index + pages_set,
440 fwp->addr + (n * MLX5_ADAPTER_PAGE_SIZE));
441 pages_set++;
442
443 if (!--npages)
444 break;
445 }
446
447 return pages_set;
448 }
449
reclaim_pages_cmd(struct mlx5_core_dev * dev,u32 * in,int in_size,u32 * out,int out_size)450 static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
451 u32 *in, int in_size, u32 *out, int out_size)
452 {
453 struct rb_root *root;
454 struct fw_page *fwp;
455 struct rb_node *p;
456 bool ec_function;
457 u32 func_id;
458 u32 npages;
459 u32 i = 0;
460
461 if (!mlx5_cmd_is_down(dev))
462 return mlx5_cmd_exec(dev, in, in_size, out, out_size);
463
464 /* No hard feelings, we want our pages back! */
465 npages = MLX5_GET(manage_pages_in, in, input_num_entries);
466 func_id = MLX5_GET(manage_pages_in, in, function_id);
467 ec_function = MLX5_GET(manage_pages_in, in, embedded_cpu_function);
468
469 root = xa_load(&dev->priv.page_root_xa, get_function(func_id, ec_function));
470 if (WARN_ON_ONCE(!root))
471 return -EEXIST;
472
473 p = rb_first(root);
474 while (p && i < npages) {
475 fwp = rb_entry(p, struct fw_page, rb_node);
476 p = rb_next(p);
477
478 i += fwp_fill_manage_pages_out(fwp, out, i, npages - i);
479 }
480
481 MLX5_SET(manage_pages_out, out, output_num_entries, i);
482 return 0;
483 }
484
reclaim_pages(struct mlx5_core_dev * dev,u16 func_id,int npages,int * nclaimed,bool ec_function)485 static int reclaim_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
486 int *nclaimed, bool ec_function)
487 {
488 u32 function = get_function(func_id, ec_function);
489 int outlen = MLX5_ST_SZ_BYTES(manage_pages_out);
490 u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {};
491 int num_claimed;
492 u32 *out;
493 int err;
494 int i;
495
496 if (nclaimed)
497 *nclaimed = 0;
498
499 outlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
500 out = kvzalloc(outlen, GFP_KERNEL);
501 if (!out)
502 return -ENOMEM;
503
504 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
505 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_TAKE);
506 MLX5_SET(manage_pages_in, in, function_id, func_id);
507 MLX5_SET(manage_pages_in, in, input_num_entries, npages);
508 MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
509
510 mlx5_core_dbg(dev, "func 0x%x, npages %d, outlen %d\n",
511 func_id, npages, outlen);
512 err = reclaim_pages_cmd(dev, in, sizeof(in), out, outlen);
513 if (err) {
514 mlx5_core_err(dev, "failed reclaiming pages: err %d\n", err);
515 goto out_free;
516 }
517
518 num_claimed = MLX5_GET(manage_pages_out, out, output_num_entries);
519 if (num_claimed > npages) {
520 mlx5_core_warn(dev, "fw returned %d, driver asked %d => corruption\n",
521 num_claimed, npages);
522 err = -EINVAL;
523 goto out_free;
524 }
525
526 for (i = 0; i < num_claimed; i++)
527 free_4k(dev, MLX5_GET64(manage_pages_out, out, pas[i]), function);
528
529 if (nclaimed)
530 *nclaimed = num_claimed;
531
532 dev->priv.fw_pages -= num_claimed;
533 if (func_id)
534 dev->priv.vfs_pages -= num_claimed;
535 else if (mlx5_core_is_ecpf(dev) && !ec_function)
536 dev->priv.host_pf_pages -= num_claimed;
537
538 out_free:
539 kvfree(out);
540 return err;
541 }
542
pages_work_handler(struct work_struct * work)543 static void pages_work_handler(struct work_struct *work)
544 {
545 struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
546 struct mlx5_core_dev *dev = req->dev;
547 int err = 0;
548
549 if (req->release_all)
550 release_all_pages(dev, req->func_id, req->ec_function);
551 else if (req->npages < 0)
552 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL,
553 req->ec_function);
554 else if (req->npages > 0)
555 err = give_pages(dev, req->func_id, req->npages, 1, req->ec_function);
556
557 if (err)
558 mlx5_core_warn(dev, "%s fail %d\n",
559 req->npages < 0 ? "reclaim" : "give", err);
560
561 kfree(req);
562 }
563
564 enum {
565 EC_FUNCTION_MASK = 0x8000,
566 RELEASE_ALL_PAGES_MASK = 0x4000,
567 };
568
req_pages_handler(struct notifier_block * nb,unsigned long type,void * data)569 static int req_pages_handler(struct notifier_block *nb,
570 unsigned long type, void *data)
571 {
572 struct mlx5_pages_req *req;
573 struct mlx5_core_dev *dev;
574 struct mlx5_priv *priv;
575 struct mlx5_eqe *eqe;
576 bool ec_function;
577 bool release_all;
578 u16 func_id;
579 s32 npages;
580
581 priv = mlx5_nb_cof(nb, struct mlx5_priv, pg_nb);
582 dev = container_of(priv, struct mlx5_core_dev, priv);
583 eqe = data;
584
585 func_id = be16_to_cpu(eqe->data.req_pages.func_id);
586 npages = be32_to_cpu(eqe->data.req_pages.num_pages);
587 ec_function = be16_to_cpu(eqe->data.req_pages.ec_function) & EC_FUNCTION_MASK;
588 release_all = be16_to_cpu(eqe->data.req_pages.ec_function) &
589 RELEASE_ALL_PAGES_MASK;
590 mlx5_core_dbg(dev, "page request for func 0x%x, npages %d, release_all %d\n",
591 func_id, npages, release_all);
592 req = kzalloc(sizeof(*req), GFP_ATOMIC);
593 if (!req) {
594 mlx5_core_warn(dev, "failed to allocate pages request\n");
595 return NOTIFY_DONE;
596 }
597
598 req->dev = dev;
599 req->func_id = func_id;
600 req->npages = npages;
601 req->ec_function = ec_function;
602 req->release_all = release_all;
603 INIT_WORK(&req->work, pages_work_handler);
604 queue_work(dev->priv.pg_wq, &req->work);
605 return NOTIFY_OK;
606 }
607
mlx5_satisfy_startup_pages(struct mlx5_core_dev * dev,int boot)608 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
609 {
610 u16 func_id;
611 s32 npages;
612 int err;
613
614 err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
615 if (err)
616 return err;
617
618 mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
619 npages, boot ? "boot" : "init", func_id);
620
621 return give_pages(dev, func_id, npages, 0, mlx5_core_is_ecpf(dev));
622 }
623
624 enum {
625 MLX5_BLKS_FOR_RECLAIM_PAGES = 12
626 };
627
optimal_reclaimed_pages(void)628 static int optimal_reclaimed_pages(void)
629 {
630 struct mlx5_cmd_prot_block *block;
631 struct mlx5_cmd_layout *lay;
632 int ret;
633
634 ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
635 MLX5_ST_SZ_BYTES(manage_pages_out)) /
636 MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
637
638 return ret;
639 }
640
mlx5_reclaim_root_pages(struct mlx5_core_dev * dev,struct rb_root * root,u16 func_id)641 static int mlx5_reclaim_root_pages(struct mlx5_core_dev *dev,
642 struct rb_root *root, u16 func_id)
643 {
644 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
645
646 while (!RB_EMPTY_ROOT(root)) {
647 int nclaimed;
648 int err;
649
650 err = reclaim_pages(dev, func_id, optimal_reclaimed_pages(),
651 &nclaimed, mlx5_core_is_ecpf(dev));
652 if (err) {
653 mlx5_core_warn(dev, "failed reclaiming pages (%d) for func id 0x%x\n",
654 err, func_id);
655 return err;
656 }
657
658 if (nclaimed)
659 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
660
661 if (time_after(jiffies, end)) {
662 mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
663 break;
664 }
665 }
666
667 return 0;
668 }
669
mlx5_reclaim_startup_pages(struct mlx5_core_dev * dev)670 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
671 {
672 struct rb_root *root;
673 unsigned long id;
674 void *entry;
675
676 xa_for_each(&dev->priv.page_root_xa, id, entry) {
677 root = entry;
678 mlx5_reclaim_root_pages(dev, root, id);
679 xa_erase(&dev->priv.page_root_xa, id);
680 kfree(root);
681 }
682
683 WARN_ON(!xa_empty(&dev->priv.page_root_xa));
684
685 WARN(dev->priv.fw_pages,
686 "FW pages counter is %d after reclaiming all pages\n",
687 dev->priv.fw_pages);
688 WARN(dev->priv.vfs_pages,
689 "VFs FW pages counter is %d after reclaiming all pages\n",
690 dev->priv.vfs_pages);
691 WARN(dev->priv.host_pf_pages,
692 "External host PF FW pages counter is %d after reclaiming all pages\n",
693 dev->priv.host_pf_pages);
694
695 return 0;
696 }
697
mlx5_pagealloc_init(struct mlx5_core_dev * dev)698 int mlx5_pagealloc_init(struct mlx5_core_dev *dev)
699 {
700 INIT_LIST_HEAD(&dev->priv.free_list);
701 dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
702 if (!dev->priv.pg_wq)
703 return -ENOMEM;
704
705 xa_init(&dev->priv.page_root_xa);
706
707 return 0;
708 }
709
mlx5_pagealloc_cleanup(struct mlx5_core_dev * dev)710 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
711 {
712 xa_destroy(&dev->priv.page_root_xa);
713 destroy_workqueue(dev->priv.pg_wq);
714 }
715
mlx5_pagealloc_start(struct mlx5_core_dev * dev)716 void mlx5_pagealloc_start(struct mlx5_core_dev *dev)
717 {
718 MLX5_NB_INIT(&dev->priv.pg_nb, req_pages_handler, PAGE_REQUEST);
719 mlx5_eq_notifier_register(dev, &dev->priv.pg_nb);
720 }
721
mlx5_pagealloc_stop(struct mlx5_core_dev * dev)722 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
723 {
724 mlx5_eq_notifier_unregister(dev, &dev->priv.pg_nb);
725 flush_workqueue(dev->priv.pg_wq);
726 }
727
mlx5_wait_for_pages(struct mlx5_core_dev * dev,int * pages)728 int mlx5_wait_for_pages(struct mlx5_core_dev *dev, int *pages)
729 {
730 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
731 int prev_pages = *pages;
732
733 /* In case of internal error we will free the pages manually later */
734 if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
735 mlx5_core_warn(dev, "Skipping wait for vf pages stage");
736 return 0;
737 }
738
739 mlx5_core_dbg(dev, "Waiting for %d pages\n", prev_pages);
740 while (*pages) {
741 if (time_after(jiffies, end)) {
742 mlx5_core_warn(dev, "aborting while there are %d pending pages\n", *pages);
743 return -ETIMEDOUT;
744 }
745 if (*pages < prev_pages) {
746 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
747 prev_pages = *pages;
748 }
749 msleep(50);
750 }
751
752 mlx5_core_dbg(dev, "All pages received\n");
753 return 0;
754 }
755
