2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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/mlx5/cmd.h>
39 #include "mlx5_core.h"
42 MLX5_PAGES_CANT_GIVE = 0,
47 struct mlx5_pages_req {
48 struct mlx5_core_dev *dev;
51 struct work_struct work;
55 struct rb_node rb_node;
59 unsigned long bitmask;
60 struct list_head list;
65 MAX_RECLAIM_TIME_MSECS = 5000,
66 MAX_RECLAIM_VFS_PAGES_TIME_MSECS = 2 * 1000 * 60,
70 MLX5_MAX_RECLAIM_TIME_MILI = 5000,
71 MLX5_NUM_4K_IN_PAGE = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
74 static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
76 struct rb_root *root = &dev->priv.page_root;
77 struct rb_node **new = &root->rb_node;
78 struct rb_node *parent = NULL;
85 tfp = rb_entry(parent, struct fw_page, rb_node);
87 new = &parent->rb_left;
88 else if (tfp->addr > addr)
89 new = &parent->rb_right;
94 nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
100 nfp->func_id = func_id;
101 nfp->free_count = MLX5_NUM_4K_IN_PAGE;
102 for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
103 set_bit(i, &nfp->bitmask);
105 rb_link_node(&nfp->rb_node, parent, new);
106 rb_insert_color(&nfp->rb_node, root);
107 list_add(&nfp->list, &dev->priv.free_list);
112 static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
114 struct rb_root *root = &dev->priv.page_root;
115 struct rb_node *tmp = root->rb_node;
116 struct fw_page *result = NULL;
120 tfp = rb_entry(tmp, struct fw_page, rb_node);
121 if (tfp->addr < addr) {
123 } else if (tfp->addr > addr) {
134 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
135 s32 *npages, int boot)
137 u32 out[MLX5_ST_SZ_DW(query_pages_out)] = {0};
138 u32 in[MLX5_ST_SZ_DW(query_pages_in)] = {0};
141 MLX5_SET(query_pages_in, in, opcode, MLX5_CMD_OP_QUERY_PAGES);
142 MLX5_SET(query_pages_in, in, op_mod, boot ?
143 MLX5_QUERY_PAGES_IN_OP_MOD_BOOT_PAGES :
144 MLX5_QUERY_PAGES_IN_OP_MOD_INIT_PAGES);
146 err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
150 *npages = MLX5_GET(query_pages_out, out, num_pages);
151 *func_id = MLX5_GET(query_pages_out, out, function_id);
156 static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
161 if (list_empty(&dev->priv.free_list))
164 fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
165 n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
166 if (n >= MLX5_NUM_4K_IN_PAGE) {
167 mlx5_core_warn(dev, "alloc 4k bug\n");
170 clear_bit(n, &fp->bitmask);
175 *addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
180 #define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
182 static void free_4k(struct mlx5_core_dev *dev, u64 addr)
187 fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK);
189 mlx5_core_warn(dev, "page not found\n");
193 n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
195 set_bit(n, &fwp->bitmask);
196 if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
197 rb_erase(&fwp->rb_node, &dev->priv.page_root);
198 if (fwp->free_count != 1)
199 list_del(&fwp->list);
200 dma_unmap_page(&dev->pdev->dev, addr & MLX5_U64_4K_PAGE_MASK,
201 PAGE_SIZE, DMA_BIDIRECTIONAL);
202 __free_page(fwp->page);
204 } else if (fwp->free_count == 1) {
205 list_add(&fwp->list, &dev->priv.free_list);
209 static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
215 int nid = dev_to_node(&dev->pdev->dev);
217 page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
219 mlx5_core_warn(dev, "failed to allocate page\n");
223 addr = dma_map_page(&dev->pdev->dev, page, 0,
224 PAGE_SIZE, DMA_BIDIRECTIONAL);
225 if (dma_mapping_error(&dev->pdev->dev, addr)) {
226 mlx5_core_warn(dev, "failed dma mapping page\n");
231 /* Firmware doesn't support page with physical address 0 */
237 err = insert_page(dev, addr, page, func_id);
239 mlx5_core_err(dev, "failed to track allocated page\n");
240 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE,
249 dma_unmap_page(&dev->pdev->dev, zero_addr, PAGE_SIZE,
255 static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id)
257 u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
258 u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {0};
261 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
262 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_CANT_GIVE);
263 MLX5_SET(manage_pages_in, in, function_id, func_id);
265 err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
267 mlx5_core_warn(dev, "page notify failed func_id(%d) err(%d)\n",
271 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
274 u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
275 int inlen = MLX5_ST_SZ_BYTES(manage_pages_in);
281 inlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_in, pas[0]);
282 in = mlx5_vzalloc(inlen);
285 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
289 for (i = 0; i < npages; i++) {
291 err = alloc_4k(dev, &addr);
294 err = alloc_system_page(dev, func_id);
300 MLX5_ARRAY_SET64(manage_pages_in, in, pas, i, addr);
303 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
304 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_GIVE);
305 MLX5_SET(manage_pages_in, in, function_id, func_id);
306 MLX5_SET(manage_pages_in, in, input_num_entries, npages);
308 err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
310 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
311 func_id, npages, err);
315 dev->priv.fw_pages += npages;
317 dev->priv.vfs_pages += npages;
319 mlx5_core_dbg(dev, "err %d\n", err);
325 for (i--; i >= 0; i--)
326 free_4k(dev, MLX5_GET64(manage_pages_in, in, pas[i]));
330 page_notify_fail(dev, func_id);
334 static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
335 u32 *in, int in_size, u32 *out, int out_size)
343 if (dev->state != MLX5_DEVICE_STATE_INTERNAL_ERROR)
344 return mlx5_cmd_exec(dev, in, in_size, out, out_size);
346 /* No hard feelings, we want our pages back! */
347 npages = MLX5_GET(manage_pages_in, in, input_num_entries);
348 func_id = MLX5_GET(manage_pages_in, in, function_id);
350 p = rb_first(&dev->priv.page_root);
351 while (p && i < npages) {
352 fwp = rb_entry(p, struct fw_page, rb_node);
354 if (fwp->func_id != func_id)
357 MLX5_ARRAY_SET64(manage_pages_out, out, pas, i, fwp->addr);
361 MLX5_SET(manage_pages_out, out, output_num_entries, i);
365 static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
368 int outlen = MLX5_ST_SZ_BYTES(manage_pages_out);
369 u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {0};
378 outlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
379 out = mlx5_vzalloc(outlen);
383 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
384 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_TAKE);
385 MLX5_SET(manage_pages_in, in, function_id, func_id);
386 MLX5_SET(manage_pages_in, in, input_num_entries, npages);
388 mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
389 err = reclaim_pages_cmd(dev, in, sizeof(in), out, outlen);
391 mlx5_core_err(dev, "failed reclaiming pages: err %d\n", err);
395 num_claimed = MLX5_GET(manage_pages_out, out, output_num_entries);
396 if (num_claimed > npages) {
397 mlx5_core_warn(dev, "fw returned %d, driver asked %d => corruption\n",
398 num_claimed, npages);
403 for (i = 0; i < num_claimed; i++)
404 free_4k(dev, MLX5_GET64(manage_pages_out, out, pas[i]));
408 *nclaimed = num_claimed;
410 dev->priv.fw_pages -= num_claimed;
412 dev->priv.vfs_pages -= num_claimed;
419 static void pages_work_handler(struct work_struct *work)
421 struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
422 struct mlx5_core_dev *dev = req->dev;
426 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
427 else if (req->npages > 0)
428 err = give_pages(dev, req->func_id, req->npages, 1);
431 mlx5_core_warn(dev, "%s fail %d\n",
432 req->npages < 0 ? "reclaim" : "give", err);
437 void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
440 struct mlx5_pages_req *req;
442 req = kzalloc(sizeof(*req), GFP_ATOMIC);
444 mlx5_core_warn(dev, "failed to allocate pages request\n");
449 req->func_id = func_id;
450 req->npages = npages;
451 INIT_WORK(&req->work, pages_work_handler);
452 queue_work(dev->priv.pg_wq, &req->work);
455 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
457 u16 uninitialized_var(func_id);
458 s32 uninitialized_var(npages);
461 err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
465 mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
466 npages, boot ? "boot" : "init", func_id);
468 return give_pages(dev, func_id, npages, 0);
472 MLX5_BLKS_FOR_RECLAIM_PAGES = 12
475 static int optimal_reclaimed_pages(void)
477 struct mlx5_cmd_prot_block *block;
478 struct mlx5_cmd_layout *lay;
481 ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
482 MLX5_ST_SZ_BYTES(manage_pages_out)) /
483 MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
488 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
490 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
497 p = rb_first(&dev->priv.page_root);
499 fwp = rb_entry(p, struct fw_page, rb_node);
500 err = reclaim_pages(dev, fwp->func_id,
501 optimal_reclaimed_pages(),
505 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
510 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
512 if (time_after(jiffies, end)) {
513 mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
518 WARN(dev->priv.fw_pages,
519 "FW pages counter is %d after reclaiming all pages\n",
521 WARN(dev->priv.vfs_pages,
522 "VFs FW pages counter is %d after reclaiming all pages\n",
523 dev->priv.vfs_pages);
528 void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
530 dev->priv.page_root = RB_ROOT;
531 INIT_LIST_HEAD(&dev->priv.free_list);
534 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
539 int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
541 dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
542 if (!dev->priv.pg_wq)
548 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
550 destroy_workqueue(dev->priv.pg_wq);
553 int mlx5_wait_for_vf_pages(struct mlx5_core_dev *dev)
555 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
556 int prev_vfs_pages = dev->priv.vfs_pages;
558 /* In case of internal error we will free the pages manually later */
559 if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
560 mlx5_core_warn(dev, "Skipping wait for vf pages stage");
564 mlx5_core_dbg(dev, "Waiting for %d pages from %s\n", prev_vfs_pages,
566 while (dev->priv.vfs_pages) {
567 if (time_after(jiffies, end)) {
568 mlx5_core_warn(dev, "aborting while there are %d pending pages\n", dev->priv.vfs_pages);
571 if (dev->priv.vfs_pages < prev_vfs_pages) {
572 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
573 prev_vfs_pages = dev->priv.vfs_pages;
578 mlx5_core_dbg(dev, "All pages received from %s\n", dev->priv.name);