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
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8 * OpenIB.org BSD license below:
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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
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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)
214 int nid = dev_to_node(&dev->pdev->dev);
216 page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
218 mlx5_core_warn(dev, "failed to allocate page\n");
221 addr = dma_map_page(&dev->pdev->dev, page, 0,
222 PAGE_SIZE, DMA_BIDIRECTIONAL);
223 if (dma_mapping_error(&dev->pdev->dev, addr)) {
224 mlx5_core_warn(dev, "failed dma mapping page\n");
228 err = insert_page(dev, addr, page, func_id);
230 mlx5_core_err(dev, "failed to track allocated page\n");
237 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
245 static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id)
247 u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
248 u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {0};
251 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
252 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_CANT_GIVE);
253 MLX5_SET(manage_pages_in, in, function_id, func_id);
255 err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
257 mlx5_core_warn(dev, "page notify failed func_id(%d) err(%d)\n",
261 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
264 u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
265 int inlen = MLX5_ST_SZ_BYTES(manage_pages_in);
271 inlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_in, pas[0]);
272 in = mlx5_vzalloc(inlen);
275 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
279 for (i = 0; i < npages; i++) {
281 err = alloc_4k(dev, &addr);
284 err = alloc_system_page(dev, func_id);
290 MLX5_ARRAY_SET64(manage_pages_in, in, pas, i, addr);
293 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
294 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_GIVE);
295 MLX5_SET(manage_pages_in, in, function_id, func_id);
296 MLX5_SET(manage_pages_in, in, input_num_entries, npages);
298 err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
300 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
301 func_id, npages, err);
305 dev->priv.fw_pages += npages;
307 dev->priv.vfs_pages += npages;
309 mlx5_core_dbg(dev, "err %d\n", err);
315 for (i--; i >= 0; i--)
316 free_4k(dev, MLX5_GET64(manage_pages_in, in, pas[i]));
320 page_notify_fail(dev, func_id);
324 static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
325 u32 *in, int in_size, u32 *out, int out_size)
333 if (dev->state != MLX5_DEVICE_STATE_INTERNAL_ERROR)
334 return mlx5_cmd_exec(dev, in, in_size, out, out_size);
336 /* No hard feelings, we want our pages back! */
337 npages = MLX5_GET(manage_pages_in, in, input_num_entries);
338 func_id = MLX5_GET(manage_pages_in, in, function_id);
340 p = rb_first(&dev->priv.page_root);
341 while (p && i < npages) {
342 fwp = rb_entry(p, struct fw_page, rb_node);
344 if (fwp->func_id != func_id)
347 MLX5_ARRAY_SET64(manage_pages_out, out, pas, i, fwp->addr);
351 MLX5_SET(manage_pages_out, out, output_num_entries, i);
355 static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
358 int outlen = MLX5_ST_SZ_BYTES(manage_pages_out);
359 u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {0};
368 outlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
369 out = mlx5_vzalloc(outlen);
373 MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
374 MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_TAKE);
375 MLX5_SET(manage_pages_in, in, function_id, func_id);
376 MLX5_SET(manage_pages_in, in, input_num_entries, npages);
378 mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
379 err = reclaim_pages_cmd(dev, in, sizeof(in), out, outlen);
381 mlx5_core_err(dev, "failed reclaiming pages: err %d\n", err);
385 num_claimed = MLX5_GET(manage_pages_out, out, output_num_entries);
386 if (num_claimed > npages) {
387 mlx5_core_warn(dev, "fw returned %d, driver asked %d => corruption\n",
388 num_claimed, npages);
393 for (i = 0; i < num_claimed; i++)
394 free_4k(dev, MLX5_GET64(manage_pages_out, out, pas[i]));
398 *nclaimed = num_claimed;
400 dev->priv.fw_pages -= num_claimed;
402 dev->priv.vfs_pages -= num_claimed;
409 static void pages_work_handler(struct work_struct *work)
411 struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
412 struct mlx5_core_dev *dev = req->dev;
416 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
417 else if (req->npages > 0)
418 err = give_pages(dev, req->func_id, req->npages, 1);
421 mlx5_core_warn(dev, "%s fail %d\n",
422 req->npages < 0 ? "reclaim" : "give", err);
427 void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
430 struct mlx5_pages_req *req;
432 req = kzalloc(sizeof(*req), GFP_ATOMIC);
434 mlx5_core_warn(dev, "failed to allocate pages request\n");
439 req->func_id = func_id;
440 req->npages = npages;
441 INIT_WORK(&req->work, pages_work_handler);
442 queue_work(dev->priv.pg_wq, &req->work);
445 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
447 u16 uninitialized_var(func_id);
448 s32 uninitialized_var(npages);
451 err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
455 mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
456 npages, boot ? "boot" : "init", func_id);
458 return give_pages(dev, func_id, npages, 0);
462 MLX5_BLKS_FOR_RECLAIM_PAGES = 12
465 static int optimal_reclaimed_pages(void)
467 struct mlx5_cmd_prot_block *block;
468 struct mlx5_cmd_layout *lay;
471 ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
472 MLX5_ST_SZ_BYTES(manage_pages_out)) /
473 MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
478 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
480 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
487 p = rb_first(&dev->priv.page_root);
489 fwp = rb_entry(p, struct fw_page, rb_node);
490 err = reclaim_pages(dev, fwp->func_id,
491 optimal_reclaimed_pages(),
495 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
500 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
502 if (time_after(jiffies, end)) {
503 mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
508 WARN(dev->priv.fw_pages,
509 "FW pages counter is %d after reclaiming all pages\n",
511 WARN(dev->priv.vfs_pages,
512 "VFs FW pages counter is %d after reclaiming all pages\n",
513 dev->priv.vfs_pages);
518 void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
520 dev->priv.page_root = RB_ROOT;
521 INIT_LIST_HEAD(&dev->priv.free_list);
524 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
529 int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
531 dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
532 if (!dev->priv.pg_wq)
538 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
540 destroy_workqueue(dev->priv.pg_wq);
543 int mlx5_wait_for_vf_pages(struct mlx5_core_dev *dev)
545 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
546 int prev_vfs_pages = dev->priv.vfs_pages;
548 /* In case of internal error we will free the pages manually later */
549 if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
550 mlx5_core_warn(dev, "Skipping wait for vf pages stage");
554 mlx5_core_dbg(dev, "Waiting for %d pages from %s\n", prev_vfs_pages,
556 while (dev->priv.vfs_pages) {
557 if (time_after(jiffies, end)) {
558 mlx5_core_warn(dev, "aborting while there are %d pending pages\n", dev->priv.vfs_pages);
561 if (dev->priv.vfs_pages < prev_vfs_pages) {
562 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
563 prev_vfs_pages = dev->priv.vfs_pages;
568 mlx5_core_dbg(dev, "All pages received from %s\n", dev->priv.name);