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/delay.h>
36 #include <linux/mlx5/driver.h>
37 #include <linux/xarray.h>
38 #include "mlx5_core.h"
39 #include "lib/eq.h"
40 #include "lib/tout.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 	MLX5_MAX_RECLAIM_TIME_MILI	= 5000,
69 	MLX5_NUM_4K_IN_PAGE		= PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
70 };
71 
get_function(u16 func_id,bool ec_function)72 static u32 get_function(u16 func_id, bool ec_function)
73 {
74 	return (u32)func_id | (ec_function << 16);
75 }
76 
page_root_per_function(struct mlx5_core_dev * dev,u32 function)77 static struct rb_root *page_root_per_function(struct mlx5_core_dev *dev, u32 function)
78 {
79 	struct rb_root *root;
80 	int err;
81 
82 	root = xa_load(&dev->priv.page_root_xa, function);
83 	if (root)
84 		return root;
85 
86 	root = kzalloc(sizeof(*root), GFP_KERNEL);
87 	if (!root)
88 		return ERR_PTR(-ENOMEM);
89 
90 	err = xa_insert(&dev->priv.page_root_xa, function, root, GFP_KERNEL);
91 	if (err) {
92 		kfree(root);
93 		return ERR_PTR(err);
94 	}
95 
96 	*root = RB_ROOT;
97 
98 	return root;
99 }
100 
insert_page(struct mlx5_core_dev * dev,u64 addr,struct page * page,u32 function)101 static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u32 function)
102 {
103 	struct rb_node *parent = NULL;
104 	struct rb_root *root;
105 	struct rb_node **new;
106 	struct fw_page *nfp;
107 	struct fw_page *tfp;
108 	int i;
109 
110 	root = page_root_per_function(dev, function);
111 	if (IS_ERR(root))
112 		return PTR_ERR(root);
113 
114 	new = &root->rb_node;
115 
116 	while (*new) {
117 		parent = *new;
118 		tfp = rb_entry(parent, struct fw_page, rb_node);
119 		if (tfp->addr < addr)
120 			new = &parent->rb_left;
121 		else if (tfp->addr > addr)
122 			new = &parent->rb_right;
123 		else
124 			return -EEXIST;
125 	}
126 
127 	nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
128 	if (!nfp)
129 		return -ENOMEM;
130 
131 	nfp->addr = addr;
132 	nfp->page = page;
133 	nfp->function = function;
134 	nfp->free_count = MLX5_NUM_4K_IN_PAGE;
135 	for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
136 		set_bit(i, &nfp->bitmask);
137 
138 	rb_link_node(&nfp->rb_node, parent, new);
139 	rb_insert_color(&nfp->rb_node, root);
140 	list_add(&nfp->list, &dev->priv.free_list);
141 
142 	return 0;
143 }
144 
find_fw_page(struct mlx5_core_dev * dev,u64 addr,u32 function)145 static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr,
146 				    u32 function)
147 {
148 	struct fw_page *result = NULL;
149 	struct rb_root *root;
150 	struct rb_node *tmp;
151 	struct fw_page *tfp;
152 
153 	root = xa_load(&dev->priv.page_root_xa, function);
154 	if (WARN_ON_ONCE(!root))
155 		return NULL;
156 
157 	tmp = root->rb_node;
158 
159 	while (tmp) {
160 		tfp = rb_entry(tmp, struct fw_page, rb_node);
161 		if (tfp->addr < addr) {
162 			tmp = tmp->rb_left;
163 		} else if (tfp->addr > addr) {
164 			tmp = tmp->rb_right;
165 		} else {
166 			result = tfp;
167 			break;
168 		}
169 	}
170 
171 	return result;
172 }
173 
mlx5_cmd_query_pages(struct mlx5_core_dev * dev,u16 * func_id,s32 * npages,int boot)174 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
175 				s32 *npages, int boot)
176 {
177 	u32 out[MLX5_ST_SZ_DW(query_pages_out)] = {};
178 	u32 in[MLX5_ST_SZ_DW(query_pages_in)] = {};
179 	int err;
180 
181 	MLX5_SET(query_pages_in, in, opcode, MLX5_CMD_OP_QUERY_PAGES);
182 	MLX5_SET(query_pages_in, in, op_mod, boot ?
183 		 MLX5_QUERY_PAGES_IN_OP_MOD_BOOT_PAGES :
184 		 MLX5_QUERY_PAGES_IN_OP_MOD_INIT_PAGES);
185 	MLX5_SET(query_pages_in, in, embedded_cpu_function, mlx5_core_is_ecpf(dev));
186 
187 	err = mlx5_cmd_exec_inout(dev, query_pages, in, out);
188 	if (err)
189 		return err;
190 
191 	*npages = MLX5_GET(query_pages_out, out, num_pages);
192 	*func_id = MLX5_GET(query_pages_out, out, function_id);
193 
194 	return err;
195 }
196 
alloc_4k(struct mlx5_core_dev * dev,u64 * addr,u32 function)197 static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr, u32 function)
198 {
199 	struct fw_page *fp = NULL;
200 	struct fw_page *iter;
201 	unsigned n;
202 
203 	list_for_each_entry(iter, &dev->priv.free_list, list) {
204 		if (iter->function != function)
205 			continue;
206 		fp = iter;
207 	}
208 
209 	if (list_empty(&dev->priv.free_list) || !fp)
210 		return -ENOMEM;
211 
212 	n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
213 	if (n >= MLX5_NUM_4K_IN_PAGE) {
214 		mlx5_core_warn(dev, "alloc 4k bug\n");
215 		return -ENOENT;
216 	}
217 	clear_bit(n, &fp->bitmask);
218 	fp->free_count--;
219 	if (!fp->free_count)
220 		list_del(&fp->list);
221 
222 	*addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
223 
224 	return 0;
225 }
226 
227 #define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
228 
free_fwp(struct mlx5_core_dev * dev,struct fw_page * fwp,bool in_free_list)229 static void free_fwp(struct mlx5_core_dev *dev, struct fw_page *fwp,
230 		     bool in_free_list)
231 {
232 	struct rb_root *root;
233 
234 	root = xa_load(&dev->priv.page_root_xa, fwp->function);
235 	if (WARN_ON_ONCE(!root))
236 		return;
237 
238 	rb_erase(&fwp->rb_node, root);
239 	if (in_free_list)
240 		list_del(&fwp->list);
241 	dma_unmap_page(mlx5_core_dma_dev(dev), fwp->addr & MLX5_U64_4K_PAGE_MASK,
242 		       PAGE_SIZE, DMA_BIDIRECTIONAL);
243 	__free_page(fwp->page);
244 	kfree(fwp);
245 }
246 
free_4k(struct mlx5_core_dev * dev,u64 addr,u32 function)247 static void free_4k(struct mlx5_core_dev *dev, u64 addr, u32 function)
248 {
249 	struct fw_page *fwp;
250 	int n;
251 
252 	fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK, function);
253 	if (!fwp) {
254 		mlx5_core_warn_rl(dev, "page not found\n");
255 		return;
256 	}
257 	n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
258 	fwp->free_count++;
259 	set_bit(n, &fwp->bitmask);
260 	if (fwp->free_count == MLX5_NUM_4K_IN_PAGE)
261 		free_fwp(dev, fwp, fwp->free_count != 1);
262 	else if (fwp->free_count == 1)
263 		list_add(&fwp->list, &dev->priv.free_list);
264 }
265 
alloc_system_page(struct mlx5_core_dev * dev,u32 function)266 static int alloc_system_page(struct mlx5_core_dev *dev, u32 function)
267 {
268 	struct device *device = mlx5_core_dma_dev(dev);
269 	int nid = dev_to_node(device);
270 	struct page *page;
271 	u64 zero_addr = 1;
272 	u64 addr;
273 	int err;
274 
275 	page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
276 	if (!page) {
277 		mlx5_core_warn(dev, "failed to allocate page\n");
278 		return -ENOMEM;
279 	}
280 map:
281 	addr = dma_map_page(device, page, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
282 	if (dma_mapping_error(device, addr)) {
283 		mlx5_core_warn(dev, "failed dma mapping page\n");
284 		err = -ENOMEM;
285 		goto err_mapping;
286 	}
287 
288 	/* Firmware doesn't support page with physical address 0 */
289 	if (addr == 0) {
290 		zero_addr = addr;
291 		goto map;
292 	}
293 
294 	err = insert_page(dev, addr, page, function);
295 	if (err) {
296 		mlx5_core_err(dev, "failed to track allocated page\n");
297 		dma_unmap_page(device, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
298 	}
299 
300 err_mapping:
301 	if (err)
302 		__free_page(page);
303 
304 	if (zero_addr == 0)
305 		dma_unmap_page(device, zero_addr, PAGE_SIZE,
306 			       DMA_BIDIRECTIONAL);
307 
308 	return err;
309 }
310 
page_notify_fail(struct mlx5_core_dev * dev,u16 func_id,bool ec_function)311 static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id,
312 			     bool ec_function)
313 {
314 	u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {};
315 	int err;
316 
317 	MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
318 	MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_CANT_GIVE);
319 	MLX5_SET(manage_pages_in, in, function_id, func_id);
320 	MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
321 
322 	err = mlx5_cmd_exec_in(dev, manage_pages, in);
323 	if (err)
324 		mlx5_core_warn(dev, "page notify failed func_id(%d) err(%d)\n",
325 			       func_id, err);
326 }
327 
give_pages(struct mlx5_core_dev * dev,u16 func_id,int npages,int event,bool ec_function)328 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
329 		      int event, bool ec_function)
330 {
331 	u32 function = get_function(func_id, ec_function);
332 	u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
333 	int inlen = MLX5_ST_SZ_BYTES(manage_pages_in);
334 	int notify_fail = event;
335 	u64 addr;
336 	int err;
337 	u32 *in;
338 	int i;
339 
340 	inlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_in, pas[0]);
341 	in = kvzalloc(inlen, GFP_KERNEL);
342 	if (!in) {
343 		err = -ENOMEM;
344 		mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
345 		goto out_free;
346 	}
347 
348 	for (i = 0; i < npages; i++) {
349 retry:
350 		err = alloc_4k(dev, &addr, function);
351 		if (err) {
352 			if (err == -ENOMEM)
353 				err = alloc_system_page(dev, function);
354 			if (err) {
355 				dev->priv.fw_pages_alloc_failed += (npages - i);
356 				goto out_4k;
357 			}
358 
359 			goto retry;
360 		}
361 		MLX5_ARRAY_SET64(manage_pages_in, in, pas, i, addr);
362 	}
363 
364 	MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
365 	MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_GIVE);
366 	MLX5_SET(manage_pages_in, in, function_id, func_id);
367 	MLX5_SET(manage_pages_in, in, input_num_entries, npages);
368 	MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
369 
370 	err = mlx5_cmd_do(dev, in, inlen, out, sizeof(out));
371 	if (err == -EREMOTEIO) {
372 		notify_fail = 0;
373 		/* if triggered by FW and failed by FW ignore */
374 		if (event) {
375 			err = 0;
376 			goto out_dropped;
377 		}
378 	}
379 	err = mlx5_cmd_check(dev, err, in, out);
380 	if (err) {
381 		mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
382 			       func_id, npages, err);
383 		goto out_dropped;
384 	}
385 
386 	dev->priv.fw_pages += npages;
387 	if (func_id)
388 		dev->priv.vfs_pages += npages;
389 	else if (mlx5_core_is_ecpf(dev) && !ec_function)
390 		dev->priv.host_pf_pages += npages;
391 
392 	mlx5_core_dbg(dev, "npages %d, ec_function %d, func_id 0x%x, err %d\n",
393 		      npages, ec_function, func_id, err);
394 
395 	kvfree(in);
396 	return 0;
397 
398 out_dropped:
399 	dev->priv.give_pages_dropped += npages;
400 out_4k:
401 	for (i--; i >= 0; i--)
402 		free_4k(dev, MLX5_GET64(manage_pages_in, in, pas[i]), function);
403 out_free:
404 	kvfree(in);
405 	if (notify_fail)
406 		page_notify_fail(dev, func_id, ec_function);
407 	return err;
408 }
409 
release_all_pages(struct mlx5_core_dev * dev,u16 func_id,bool ec_function)410 static void release_all_pages(struct mlx5_core_dev *dev, u16 func_id,
411 			      bool ec_function)
412 {
413 	u32 function = get_function(func_id, ec_function);
414 	struct rb_root *root;
415 	struct rb_node *p;
416 	int npages = 0;
417 
418 	root = xa_load(&dev->priv.page_root_xa, function);
419 	if (WARN_ON_ONCE(!root))
420 		return;
421 
422 	p = rb_first(root);
423 	while (p) {
424 		struct fw_page *fwp = rb_entry(p, struct fw_page, rb_node);
425 
426 		p = rb_next(p);
427 		npages += (MLX5_NUM_4K_IN_PAGE - fwp->free_count);
428 		free_fwp(dev, fwp, fwp->free_count);
429 	}
430 
431 	dev->priv.fw_pages -= npages;
432 	if (func_id)
433 		dev->priv.vfs_pages -= npages;
434 	else if (mlx5_core_is_ecpf(dev) && !ec_function)
435 		dev->priv.host_pf_pages -= npages;
436 
437 	mlx5_core_dbg(dev, "npages %d, ec_function %d, func_id 0x%x\n",
438 		      npages, ec_function, func_id);
439 }
440 
fwp_fill_manage_pages_out(struct fw_page * fwp,u32 * out,u32 index,u32 npages)441 static u32 fwp_fill_manage_pages_out(struct fw_page *fwp, u32 *out, u32 index,
442 				     u32 npages)
443 {
444 	u32 pages_set = 0;
445 	unsigned int n;
446 
447 	for_each_clear_bit(n, &fwp->bitmask, MLX5_NUM_4K_IN_PAGE) {
448 		MLX5_ARRAY_SET64(manage_pages_out, out, pas, index + pages_set,
449 				 fwp->addr + (n * MLX5_ADAPTER_PAGE_SIZE));
450 		pages_set++;
451 
452 		if (!--npages)
453 			break;
454 	}
455 
456 	return pages_set;
457 }
458 
reclaim_pages_cmd(struct mlx5_core_dev * dev,u32 * in,int in_size,u32 * out,int out_size)459 static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
460 			     u32 *in, int in_size, u32 *out, int out_size)
461 {
462 	struct rb_root *root;
463 	struct fw_page *fwp;
464 	struct rb_node *p;
465 	bool ec_function;
466 	u32 func_id;
467 	u32 npages;
468 	u32 i = 0;
469 
470 	if (!mlx5_cmd_is_down(dev))
471 		return mlx5_cmd_do(dev, in, in_size, out, out_size);
472 
473 	/* No hard feelings, we want our pages back! */
474 	npages = MLX5_GET(manage_pages_in, in, input_num_entries);
475 	func_id = MLX5_GET(manage_pages_in, in, function_id);
476 	ec_function = MLX5_GET(manage_pages_in, in, embedded_cpu_function);
477 
478 	root = xa_load(&dev->priv.page_root_xa, get_function(func_id, ec_function));
479 	if (WARN_ON_ONCE(!root))
480 		return -EEXIST;
481 
482 	p = rb_first(root);
483 	while (p && i < npages) {
484 		fwp = rb_entry(p, struct fw_page, rb_node);
485 		p = rb_next(p);
486 
487 		i += fwp_fill_manage_pages_out(fwp, out, i, npages - i);
488 	}
489 
490 	MLX5_SET(manage_pages_out, out, output_num_entries, i);
491 	return 0;
492 }
493 
reclaim_pages(struct mlx5_core_dev * dev,u16 func_id,int npages,int * nclaimed,bool event,bool ec_function)494 static int reclaim_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
495 			 int *nclaimed, bool event, bool ec_function)
496 {
497 	u32 function = get_function(func_id, ec_function);
498 	int outlen = MLX5_ST_SZ_BYTES(manage_pages_out);
499 	u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {};
500 	int num_claimed;
501 	u32 *out;
502 	int err;
503 	int i;
504 
505 	if (nclaimed)
506 		*nclaimed = 0;
507 
508 	outlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
509 	out = kvzalloc(outlen, GFP_KERNEL);
510 	if (!out)
511 		return -ENOMEM;
512 
513 	MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
514 	MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_TAKE);
515 	MLX5_SET(manage_pages_in, in, function_id, func_id);
516 	MLX5_SET(manage_pages_in, in, input_num_entries, npages);
517 	MLX5_SET(manage_pages_in, in, embedded_cpu_function, ec_function);
518 
519 	mlx5_core_dbg(dev, "func 0x%x, npages %d, outlen %d\n",
520 		      func_id, npages, outlen);
521 	err = reclaim_pages_cmd(dev, in, sizeof(in), out, outlen);
522 	if (err) {
523 		npages = MLX5_GET(manage_pages_in, in, input_num_entries);
524 		dev->priv.reclaim_pages_discard += npages;
525 	}
526 	/* if triggered by FW event and failed by FW then ignore */
527 	if (event && err == -EREMOTEIO) {
528 		err = 0;
529 		goto out_free;
530 	}
531 
532 	err = mlx5_cmd_check(dev, err, in, out);
533 	if (err) {
534 		mlx5_core_err(dev, "failed reclaiming pages: err %d\n", err);
535 		goto out_free;
536 	}
537 
538 	num_claimed = MLX5_GET(manage_pages_out, out, output_num_entries);
539 	if (num_claimed > npages) {
540 		mlx5_core_warn(dev, "fw returned %d, driver asked %d => corruption\n",
541 			       num_claimed, npages);
542 		err = -EINVAL;
543 		goto out_free;
544 	}
545 
546 	for (i = 0; i < num_claimed; i++)
547 		free_4k(dev, MLX5_GET64(manage_pages_out, out, pas[i]), function);
548 
549 	if (nclaimed)
550 		*nclaimed = num_claimed;
551 
552 	dev->priv.fw_pages -= num_claimed;
553 	if (func_id)
554 		dev->priv.vfs_pages -= num_claimed;
555 	else if (mlx5_core_is_ecpf(dev) && !ec_function)
556 		dev->priv.host_pf_pages -= num_claimed;
557 
558 out_free:
559 	kvfree(out);
560 	return err;
561 }
562 
pages_work_handler(struct work_struct * work)563 static void pages_work_handler(struct work_struct *work)
564 {
565 	struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
566 	struct mlx5_core_dev *dev = req->dev;
567 	int err = 0;
568 
569 	if (req->release_all)
570 		release_all_pages(dev, req->func_id, req->ec_function);
571 	else if (req->npages < 0)
572 		err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL,
573 				    true, req->ec_function);
574 	else if (req->npages > 0)
575 		err = give_pages(dev, req->func_id, req->npages, 1, req->ec_function);
576 
577 	if (err)
578 		mlx5_core_warn(dev, "%s fail %d\n",
579 			       req->npages < 0 ? "reclaim" : "give", err);
580 
581 	kfree(req);
582 }
583 
584 enum {
585 	EC_FUNCTION_MASK = 0x8000,
586 	RELEASE_ALL_PAGES_MASK = 0x4000,
587 };
588 
req_pages_handler(struct notifier_block * nb,unsigned long type,void * data)589 static int req_pages_handler(struct notifier_block *nb,
590 			     unsigned long type, void *data)
591 {
592 	struct mlx5_pages_req *req;
593 	struct mlx5_core_dev *dev;
594 	struct mlx5_priv *priv;
595 	struct mlx5_eqe *eqe;
596 	bool ec_function;
597 	bool release_all;
598 	u16 func_id;
599 	s32 npages;
600 
601 	priv = mlx5_nb_cof(nb, struct mlx5_priv, pg_nb);
602 	dev  = container_of(priv, struct mlx5_core_dev, priv);
603 	eqe  = data;
604 
605 	func_id = be16_to_cpu(eqe->data.req_pages.func_id);
606 	npages  = be32_to_cpu(eqe->data.req_pages.num_pages);
607 	ec_function = be16_to_cpu(eqe->data.req_pages.ec_function) & EC_FUNCTION_MASK;
608 	release_all = be16_to_cpu(eqe->data.req_pages.ec_function) &
609 		      RELEASE_ALL_PAGES_MASK;
610 	mlx5_core_dbg(dev, "page request for func 0x%x, npages %d, release_all %d\n",
611 		      func_id, npages, release_all);
612 	req = kzalloc(sizeof(*req), GFP_ATOMIC);
613 	if (!req) {
614 		mlx5_core_warn(dev, "failed to allocate pages request\n");
615 		return NOTIFY_DONE;
616 	}
617 
618 	req->dev = dev;
619 	req->func_id = func_id;
620 	req->npages = npages;
621 	req->ec_function = ec_function;
622 	req->release_all = release_all;
623 	INIT_WORK(&req->work, pages_work_handler);
624 	queue_work(dev->priv.pg_wq, &req->work);
625 	return NOTIFY_OK;
626 }
627 
mlx5_satisfy_startup_pages(struct mlx5_core_dev * dev,int boot)628 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
629 {
630 	u16 func_id;
631 	s32 npages;
632 	int err;
633 
634 	err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
635 	if (err)
636 		return err;
637 
638 	mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
639 		      npages, boot ? "boot" : "init", func_id);
640 
641 	return give_pages(dev, func_id, npages, 0, mlx5_core_is_ecpf(dev));
642 }
643 
644 enum {
645 	MLX5_BLKS_FOR_RECLAIM_PAGES = 12
646 };
647 
optimal_reclaimed_pages(void)648 static int optimal_reclaimed_pages(void)
649 {
650 	struct mlx5_cmd_prot_block *block;
651 	struct mlx5_cmd_layout *lay;
652 	int ret;
653 
654 	ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
655 	       MLX5_ST_SZ_BYTES(manage_pages_out)) /
656 	       MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
657 
658 	return ret;
659 }
660 
mlx5_reclaim_root_pages(struct mlx5_core_dev * dev,struct rb_root * root,u16 func_id)661 static int mlx5_reclaim_root_pages(struct mlx5_core_dev *dev,
662 				   struct rb_root *root, u16 func_id)
663 {
664 	u64 recl_pages_to_jiffies = msecs_to_jiffies(mlx5_tout_ms(dev, RECLAIM_PAGES));
665 	unsigned long end = jiffies + recl_pages_to_jiffies;
666 
667 	while (!RB_EMPTY_ROOT(root)) {
668 		int nclaimed;
669 		int err;
670 
671 		err = reclaim_pages(dev, func_id, optimal_reclaimed_pages(),
672 				    &nclaimed, false, mlx5_core_is_ecpf(dev));
673 		if (err) {
674 			mlx5_core_warn(dev, "failed reclaiming pages (%d) for func id 0x%x\n",
675 				       err, func_id);
676 			return err;
677 		}
678 
679 		if (nclaimed)
680 			end = jiffies + recl_pages_to_jiffies;
681 
682 		if (time_after(jiffies, end)) {
683 			mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
684 			break;
685 		}
686 	}
687 
688 	return 0;
689 }
690 
mlx5_reclaim_startup_pages(struct mlx5_core_dev * dev)691 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
692 {
693 	struct rb_root *root;
694 	unsigned long id;
695 	void *entry;
696 
697 	xa_for_each(&dev->priv.page_root_xa, id, entry) {
698 		root = entry;
699 		mlx5_reclaim_root_pages(dev, root, id);
700 		xa_erase(&dev->priv.page_root_xa, id);
701 		kfree(root);
702 	}
703 
704 	WARN_ON(!xa_empty(&dev->priv.page_root_xa));
705 
706 	WARN(dev->priv.fw_pages,
707 	     "FW pages counter is %d after reclaiming all pages\n",
708 	     dev->priv.fw_pages);
709 	WARN(dev->priv.vfs_pages,
710 	     "VFs FW pages counter is %d after reclaiming all pages\n",
711 	     dev->priv.vfs_pages);
712 	WARN(dev->priv.host_pf_pages,
713 	     "External host PF FW pages counter is %d after reclaiming all pages\n",
714 	     dev->priv.host_pf_pages);
715 
716 	return 0;
717 }
718 
mlx5_pagealloc_init(struct mlx5_core_dev * dev)719 int mlx5_pagealloc_init(struct mlx5_core_dev *dev)
720 {
721 	INIT_LIST_HEAD(&dev->priv.free_list);
722 	dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
723 	if (!dev->priv.pg_wq)
724 		return -ENOMEM;
725 
726 	xa_init(&dev->priv.page_root_xa);
727 	mlx5_pages_debugfs_init(dev);
728 
729 	return 0;
730 }
731 
mlx5_pagealloc_cleanup(struct mlx5_core_dev * dev)732 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
733 {
734 	mlx5_pages_debugfs_cleanup(dev);
735 	xa_destroy(&dev->priv.page_root_xa);
736 	destroy_workqueue(dev->priv.pg_wq);
737 }
738 
mlx5_pagealloc_start(struct mlx5_core_dev * dev)739 void mlx5_pagealloc_start(struct mlx5_core_dev *dev)
740 {
741 	MLX5_NB_INIT(&dev->priv.pg_nb, req_pages_handler, PAGE_REQUEST);
742 	mlx5_eq_notifier_register(dev, &dev->priv.pg_nb);
743 }
744 
mlx5_pagealloc_stop(struct mlx5_core_dev * dev)745 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
746 {
747 	mlx5_eq_notifier_unregister(dev, &dev->priv.pg_nb);
748 	flush_workqueue(dev->priv.pg_wq);
749 }
750 
mlx5_wait_for_pages(struct mlx5_core_dev * dev,int * pages)751 int mlx5_wait_for_pages(struct mlx5_core_dev *dev, int *pages)
752 {
753 	u64 recl_vf_pages_to_jiffies = msecs_to_jiffies(mlx5_tout_ms(dev, RECLAIM_VFS_PAGES));
754 	unsigned long end = jiffies + recl_vf_pages_to_jiffies;
755 	int prev_pages = *pages;
756 
757 	/* In case of internal error we will free the pages manually later */
758 	if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
759 		mlx5_core_warn(dev, "Skipping wait for vf pages stage");
760 		return 0;
761 	}
762 
763 	mlx5_core_dbg(dev, "Waiting for %d pages\n", prev_pages);
764 	while (*pages) {
765 		if (time_after(jiffies, end)) {
766 			mlx5_core_warn(dev, "aborting while there are %d pending pages\n", *pages);
767 			return -ETIMEDOUT;
768 		}
769 		if (*pages < prev_pages) {
770 			end = jiffies + recl_vf_pages_to_jiffies;
771 			prev_pages = *pages;
772 		}
773 		msleep(50);
774 	}
775 
776 	mlx5_core_dbg(dev, "All pages received\n");
777 	return 0;
778 }
779