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:
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
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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
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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,
50 MLX5_POST_INIT_PAGES = 3
53 struct mlx5_pages_req {
54 struct mlx5_core_dev *dev;
57 struct work_struct work;
61 struct rb_node rb_node;
65 unsigned long bitmask;
66 struct list_head list;
70 struct mlx5_query_pages_inbox {
71 struct mlx5_inbox_hdr hdr;
75 struct mlx5_query_pages_outbox {
76 struct mlx5_outbox_hdr hdr;
82 struct mlx5_manage_pages_inbox {
83 struct mlx5_inbox_hdr hdr;
90 struct mlx5_manage_pages_outbox {
91 struct mlx5_outbox_hdr hdr;
98 MAX_RECLAIM_TIME_MSECS = 5000,
99 MAX_RECLAIM_VFS_PAGES_TIME_MSECS = 2 * 1000 * 60,
103 MLX5_MAX_RECLAIM_TIME_MILI = 5000,
104 MLX5_NUM_4K_IN_PAGE = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
107 static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
109 struct rb_root *root = &dev->priv.page_root;
110 struct rb_node **new = &root->rb_node;
111 struct rb_node *parent = NULL;
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;
127 nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
133 nfp->func_id = func_id;
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);
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);
145 static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
147 struct rb_root *root = &dev->priv.page_root;
148 struct rb_node *tmp = root->rb_node;
149 struct fw_page *result = NULL;
153 tfp = rb_entry(tmp, struct fw_page, rb_node);
154 if (tfp->addr < addr) {
156 } else if (tfp->addr > addr) {
167 static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
168 s32 *npages, int boot)
170 struct mlx5_query_pages_inbox in;
171 struct mlx5_query_pages_outbox out;
174 memset(&in, 0, sizeof(in));
175 memset(&out, 0, sizeof(out));
176 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
177 in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_PAGES);
179 err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
184 return mlx5_cmd_status_to_err(&out.hdr);
186 *npages = be32_to_cpu(out.num_pages);
187 *func_id = be16_to_cpu(out.func_id);
192 static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
197 if (list_empty(&dev->priv.free_list))
200 fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
201 n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
202 if (n >= MLX5_NUM_4K_IN_PAGE) {
203 mlx5_core_warn(dev, "alloc 4k bug\n");
206 clear_bit(n, &fp->bitmask);
211 *addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
216 #define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
218 static void free_4k(struct mlx5_core_dev *dev, u64 addr)
223 fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK);
225 mlx5_core_warn(dev, "page not found\n");
229 n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
231 set_bit(n, &fwp->bitmask);
232 if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
233 rb_erase(&fwp->rb_node, &dev->priv.page_root);
234 if (fwp->free_count != 1)
235 list_del(&fwp->list);
236 dma_unmap_page(&dev->pdev->dev, addr & MLX5_U64_4K_PAGE_MASK,
237 PAGE_SIZE, DMA_BIDIRECTIONAL);
238 __free_page(fwp->page);
240 } else if (fwp->free_count == 1) {
241 list_add(&fwp->list, &dev->priv.free_list);
245 static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
250 int nid = dev_to_node(&dev->pdev->dev);
252 page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
254 mlx5_core_warn(dev, "failed to allocate page\n");
257 addr = dma_map_page(&dev->pdev->dev, page, 0,
258 PAGE_SIZE, DMA_BIDIRECTIONAL);
259 if (dma_mapping_error(&dev->pdev->dev, addr)) {
260 mlx5_core_warn(dev, "failed dma mapping page\n");
264 err = insert_page(dev, addr, page, func_id);
266 mlx5_core_err(dev, "failed to track allocated page\n");
273 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
281 static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id)
283 struct mlx5_manage_pages_inbox *in;
284 struct mlx5_manage_pages_outbox out;
287 in = kzalloc(sizeof(*in), GFP_KERNEL);
291 memset(&out, 0, sizeof(out));
292 in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
293 in->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
294 in->func_id = cpu_to_be16(func_id);
295 err = mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out));
297 err = mlx5_cmd_status_to_err(&out.hdr);
300 mlx5_core_warn(dev, "page notify failed\n");
305 static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
308 struct mlx5_manage_pages_inbox *in;
309 struct mlx5_manage_pages_outbox out;
315 inlen = sizeof(*in) + npages * sizeof(in->pas[0]);
316 in = mlx5_vzalloc(inlen);
319 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
322 memset(&out, 0, sizeof(out));
324 for (i = 0; i < npages; i++) {
326 err = alloc_4k(dev, &addr);
329 err = alloc_system_page(dev, func_id);
335 in->pas[i] = cpu_to_be64(addr);
338 in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
339 in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
340 in->func_id = cpu_to_be16(func_id);
341 in->num_entries = cpu_to_be32(npages);
342 err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
344 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
345 func_id, npages, err);
348 dev->priv.fw_pages += npages;
350 err = mlx5_cmd_status_to_err(&out.hdr);
352 mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n",
353 func_id, npages, out.hdr.status);
357 dev->priv.fw_pages += npages;
359 dev->priv.vfs_pages += npages;
361 mlx5_core_dbg(dev, "err %d\n", err);
367 for (i--; i >= 0; i--)
368 free_4k(dev, be64_to_cpu(in->pas[i]));
372 page_notify_fail(dev, func_id);
376 static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
379 struct mlx5_manage_pages_inbox in;
380 struct mlx5_manage_pages_outbox *out;
390 memset(&in, 0, sizeof(in));
391 outlen = sizeof(*out) + npages * sizeof(out->pas[0]);
392 out = mlx5_vzalloc(outlen);
396 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
397 in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
398 in.func_id = cpu_to_be16(func_id);
399 in.num_entries = cpu_to_be32(npages);
400 mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
401 err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
403 mlx5_core_err(dev, "failed reclaiming pages\n");
406 dev->priv.fw_pages -= npages;
408 if (out->hdr.status) {
409 err = mlx5_cmd_status_to_err(&out->hdr);
413 num_claimed = be32_to_cpu(out->num_entries);
414 if (num_claimed > npages) {
415 mlx5_core_warn(dev, "fw returned %d, driver asked %d => corruption\n",
416 num_claimed, npages);
421 *nclaimed = num_claimed;
423 for (i = 0; i < num_claimed; i++) {
424 addr = be64_to_cpu(out->pas[i]);
427 dev->priv.fw_pages -= num_claimed;
429 dev->priv.vfs_pages -= num_claimed;
436 static void pages_work_handler(struct work_struct *work)
438 struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
439 struct mlx5_core_dev *dev = req->dev;
443 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
444 else if (req->npages > 0)
445 err = give_pages(dev, req->func_id, req->npages, 1);
448 mlx5_core_warn(dev, "%s fail %d\n",
449 req->npages < 0 ? "reclaim" : "give", err);
454 void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
457 struct mlx5_pages_req *req;
459 req = kzalloc(sizeof(*req), GFP_ATOMIC);
461 mlx5_core_warn(dev, "failed to allocate pages request\n");
466 req->func_id = func_id;
467 req->npages = npages;
468 INIT_WORK(&req->work, pages_work_handler);
469 queue_work(dev->priv.pg_wq, &req->work);
472 int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
474 u16 uninitialized_var(func_id);
475 s32 uninitialized_var(npages);
478 err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
482 mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
483 npages, boot ? "boot" : "init", func_id);
485 return give_pages(dev, func_id, npages, 0);
489 MLX5_BLKS_FOR_RECLAIM_PAGES = 12
492 static int optimal_reclaimed_pages(void)
494 struct mlx5_cmd_prot_block *block;
495 struct mlx5_cmd_layout *lay;
498 ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
499 sizeof(struct mlx5_manage_pages_outbox)) /
500 FIELD_SIZEOF(struct mlx5_manage_pages_outbox, pas[0]);
505 int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
507 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
514 p = rb_first(&dev->priv.page_root);
516 fwp = rb_entry(p, struct fw_page, rb_node);
517 if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
518 free_4k(dev, fwp->addr);
521 err = reclaim_pages(dev, fwp->func_id,
522 optimal_reclaimed_pages(),
526 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
531 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
533 if (time_after(jiffies, end)) {
534 mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
542 void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
544 dev->priv.page_root = RB_ROOT;
545 INIT_LIST_HEAD(&dev->priv.free_list);
548 void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
553 int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
555 dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
556 if (!dev->priv.pg_wq)
562 void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
564 destroy_workqueue(dev->priv.pg_wq);
567 int mlx5_wait_for_vf_pages(struct mlx5_core_dev *dev)
569 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
570 int prev_vfs_pages = dev->priv.vfs_pages;
572 mlx5_core_dbg(dev, "Waiting for %d pages from %s\n", prev_vfs_pages,
574 while (dev->priv.vfs_pages) {
575 if (time_after(jiffies, end)) {
576 mlx5_core_warn(dev, "aborting while there are %d pending pages\n", dev->priv.vfs_pages);
579 if (dev->priv.vfs_pages < prev_vfs_pages) {
580 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_VFS_PAGES_TIME_MSECS);
581 prev_vfs_pages = dev->priv.vfs_pages;
586 mlx5_core_dbg(dev, "All pages received from %s\n", dev->priv.name);