551 lines
13 KiB
C
551 lines
13 KiB
C
/*
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* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/highmem.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mlx5/driver.h>
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#include <linux/mlx5/cmd.h>
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#include "mlx5_core.h"
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enum {
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MLX5_PAGES_CANT_GIVE = 0,
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MLX5_PAGES_GIVE = 1,
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MLX5_PAGES_TAKE = 2
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};
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enum {
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MLX5_BOOT_PAGES = 1,
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MLX5_INIT_PAGES = 2,
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MLX5_POST_INIT_PAGES = 3
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};
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struct mlx5_pages_req {
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struct mlx5_core_dev *dev;
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u16 func_id;
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s32 npages;
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struct work_struct work;
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};
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struct fw_page {
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struct rb_node rb_node;
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u64 addr;
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struct page *page;
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u16 func_id;
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unsigned long bitmask;
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struct list_head list;
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unsigned free_count;
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};
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struct mlx5_query_pages_inbox {
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struct mlx5_inbox_hdr hdr;
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u8 rsvd[8];
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};
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struct mlx5_query_pages_outbox {
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struct mlx5_outbox_hdr hdr;
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__be16 rsvd;
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__be16 func_id;
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__be32 num_pages;
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};
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struct mlx5_manage_pages_inbox {
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struct mlx5_inbox_hdr hdr;
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__be16 rsvd;
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__be16 func_id;
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__be32 num_entries;
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__be64 pas[0];
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};
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struct mlx5_manage_pages_outbox {
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struct mlx5_outbox_hdr hdr;
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__be32 num_entries;
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u8 rsvd[4];
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__be64 pas[0];
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};
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enum {
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MAX_RECLAIM_TIME_MSECS = 5000,
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};
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enum {
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MLX5_MAX_RECLAIM_TIME_MILI = 5000,
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MLX5_NUM_4K_IN_PAGE = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
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};
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static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
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{
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struct rb_root *root = &dev->priv.page_root;
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struct rb_node **new = &root->rb_node;
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struct rb_node *parent = NULL;
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struct fw_page *nfp;
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struct fw_page *tfp;
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int i;
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while (*new) {
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parent = *new;
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tfp = rb_entry(parent, struct fw_page, rb_node);
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if (tfp->addr < addr)
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new = &parent->rb_left;
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else if (tfp->addr > addr)
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new = &parent->rb_right;
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else
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return -EEXIST;
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}
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nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
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if (!nfp)
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return -ENOMEM;
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nfp->addr = addr;
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nfp->page = page;
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nfp->func_id = func_id;
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nfp->free_count = MLX5_NUM_4K_IN_PAGE;
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for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
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set_bit(i, &nfp->bitmask);
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rb_link_node(&nfp->rb_node, parent, new);
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rb_insert_color(&nfp->rb_node, root);
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list_add(&nfp->list, &dev->priv.free_list);
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return 0;
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}
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static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
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{
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struct rb_root *root = &dev->priv.page_root;
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struct rb_node *tmp = root->rb_node;
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struct fw_page *result = NULL;
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struct fw_page *tfp;
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while (tmp) {
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tfp = rb_entry(tmp, struct fw_page, rb_node);
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if (tfp->addr < addr) {
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tmp = tmp->rb_left;
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} else if (tfp->addr > addr) {
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tmp = tmp->rb_right;
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} else {
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result = tfp;
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break;
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}
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}
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return result;
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}
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static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
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s32 *npages, int boot)
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{
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struct mlx5_query_pages_inbox in;
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struct mlx5_query_pages_outbox out;
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int err;
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memset(&in, 0, sizeof(in));
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memset(&out, 0, sizeof(out));
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in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
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in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_PAGES);
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err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
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if (err)
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return err;
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if (out.hdr.status)
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return mlx5_cmd_status_to_err(&out.hdr);
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*npages = be32_to_cpu(out.num_pages);
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*func_id = be16_to_cpu(out.func_id);
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return err;
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}
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static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
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{
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struct fw_page *fp;
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unsigned n;
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if (list_empty(&dev->priv.free_list))
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return -ENOMEM;
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fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
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n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
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if (n >= MLX5_NUM_4K_IN_PAGE) {
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mlx5_core_warn(dev, "alloc 4k bug\n");
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return -ENOENT;
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}
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clear_bit(n, &fp->bitmask);
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fp->free_count--;
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if (!fp->free_count)
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list_del(&fp->list);
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*addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;
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return 0;
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}
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#define MLX5_U64_4K_PAGE_MASK ((~(u64)0U) << PAGE_SHIFT)
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static void free_4k(struct mlx5_core_dev *dev, u64 addr)
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{
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struct fw_page *fwp;
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int n;
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fwp = find_fw_page(dev, addr & MLX5_U64_4K_PAGE_MASK);
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if (!fwp) {
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mlx5_core_warn(dev, "page not found\n");
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return;
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}
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n = (addr & ~MLX5_U64_4K_PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
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fwp->free_count++;
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set_bit(n, &fwp->bitmask);
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if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
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rb_erase(&fwp->rb_node, &dev->priv.page_root);
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if (fwp->free_count != 1)
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list_del(&fwp->list);
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dma_unmap_page(&dev->pdev->dev, addr & MLX5_U64_4K_PAGE_MASK,
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PAGE_SIZE, DMA_BIDIRECTIONAL);
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__free_page(fwp->page);
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kfree(fwp);
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} else if (fwp->free_count == 1) {
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list_add(&fwp->list, &dev->priv.free_list);
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}
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}
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static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
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{
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struct page *page;
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u64 addr;
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int err;
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int nid = dev_to_node(&dev->pdev->dev);
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page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
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if (!page) {
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mlx5_core_warn(dev, "failed to allocate page\n");
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return -ENOMEM;
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}
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addr = dma_map_page(&dev->pdev->dev, page, 0,
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PAGE_SIZE, DMA_BIDIRECTIONAL);
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if (dma_mapping_error(&dev->pdev->dev, addr)) {
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mlx5_core_warn(dev, "failed dma mapping page\n");
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err = -ENOMEM;
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goto out_alloc;
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}
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err = insert_page(dev, addr, page, func_id);
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if (err) {
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mlx5_core_err(dev, "failed to track allocated page\n");
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goto out_mapping;
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}
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return 0;
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out_mapping:
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dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
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out_alloc:
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__free_page(page);
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return err;
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}
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static void page_notify_fail(struct mlx5_core_dev *dev, u16 func_id)
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{
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struct mlx5_manage_pages_inbox *in;
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struct mlx5_manage_pages_outbox out;
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int err;
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in = kzalloc(sizeof(*in), GFP_KERNEL);
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if (!in)
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return;
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memset(&out, 0, sizeof(out));
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in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
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in->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
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in->func_id = cpu_to_be16(func_id);
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err = mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out));
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if (!err)
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err = mlx5_cmd_status_to_err(&out.hdr);
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if (err)
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mlx5_core_warn(dev, "page notify failed\n");
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kfree(in);
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}
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static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
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int notify_fail)
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{
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struct mlx5_manage_pages_inbox *in;
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struct mlx5_manage_pages_outbox out;
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int inlen;
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u64 addr;
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int err;
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int i;
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inlen = sizeof(*in) + npages * sizeof(in->pas[0]);
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in = mlx5_vzalloc(inlen);
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if (!in) {
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err = -ENOMEM;
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mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
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goto out_free;
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}
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memset(&out, 0, sizeof(out));
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for (i = 0; i < npages; i++) {
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retry:
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err = alloc_4k(dev, &addr);
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if (err) {
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if (err == -ENOMEM)
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err = alloc_system_page(dev, func_id);
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if (err)
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goto out_4k;
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goto retry;
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}
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in->pas[i] = cpu_to_be64(addr);
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}
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in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
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in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
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in->func_id = cpu_to_be16(func_id);
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in->num_entries = cpu_to_be32(npages);
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err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
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if (err) {
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mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
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func_id, npages, err);
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goto out_4k;
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}
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dev->priv.fw_pages += npages;
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err = mlx5_cmd_status_to_err(&out.hdr);
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if (err) {
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mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n",
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func_id, npages, out.hdr.status);
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goto out_4k;
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}
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mlx5_core_dbg(dev, "err %d\n", err);
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kvfree(in);
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return 0;
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out_4k:
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for (i--; i >= 0; i--)
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free_4k(dev, be64_to_cpu(in->pas[i]));
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out_free:
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kvfree(in);
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if (notify_fail)
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page_notify_fail(dev, func_id);
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return err;
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}
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static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
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int *nclaimed)
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{
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struct mlx5_manage_pages_inbox in;
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struct mlx5_manage_pages_outbox *out;
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int num_claimed;
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int outlen;
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u64 addr;
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int err;
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int i;
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if (nclaimed)
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*nclaimed = 0;
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memset(&in, 0, sizeof(in));
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outlen = sizeof(*out) + npages * sizeof(out->pas[0]);
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out = mlx5_vzalloc(outlen);
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if (!out)
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return -ENOMEM;
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in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
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in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
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in.func_id = cpu_to_be16(func_id);
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in.num_entries = cpu_to_be32(npages);
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mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
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err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
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if (err) {
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mlx5_core_err(dev, "failed reclaiming pages\n");
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goto out_free;
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}
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dev->priv.fw_pages -= npages;
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if (out->hdr.status) {
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err = mlx5_cmd_status_to_err(&out->hdr);
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goto out_free;
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}
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num_claimed = be32_to_cpu(out->num_entries);
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if (nclaimed)
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*nclaimed = num_claimed;
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for (i = 0; i < num_claimed; i++) {
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addr = be64_to_cpu(out->pas[i]);
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free_4k(dev, addr);
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}
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out_free:
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kvfree(out);
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return err;
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}
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static void pages_work_handler(struct work_struct *work)
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{
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struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
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struct mlx5_core_dev *dev = req->dev;
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int err = 0;
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if (req->npages < 0)
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err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
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else if (req->npages > 0)
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err = give_pages(dev, req->func_id, req->npages, 1);
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if (err)
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mlx5_core_warn(dev, "%s fail %d\n",
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req->npages < 0 ? "reclaim" : "give", err);
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kfree(req);
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}
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void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
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s32 npages)
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{
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struct mlx5_pages_req *req;
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req = kzalloc(sizeof(*req), GFP_ATOMIC);
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if (!req) {
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mlx5_core_warn(dev, "failed to allocate pages request\n");
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return;
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}
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req->dev = dev;
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req->func_id = func_id;
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req->npages = npages;
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INIT_WORK(&req->work, pages_work_handler);
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queue_work(dev->priv.pg_wq, &req->work);
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}
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int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
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{
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u16 uninitialized_var(func_id);
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s32 uninitialized_var(npages);
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int err;
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err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
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if (err)
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return err;
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mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
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npages, boot ? "boot" : "init", func_id);
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return give_pages(dev, func_id, npages, 0);
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}
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enum {
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MLX5_BLKS_FOR_RECLAIM_PAGES = 12
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};
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static int optimal_reclaimed_pages(void)
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{
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struct mlx5_cmd_prot_block *block;
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struct mlx5_cmd_layout *lay;
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int ret;
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ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
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sizeof(struct mlx5_manage_pages_outbox)) /
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FIELD_SIZEOF(struct mlx5_manage_pages_outbox, pas[0]);
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return ret;
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}
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int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
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{
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unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
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struct fw_page *fwp;
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struct rb_node *p;
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int nclaimed = 0;
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int err = 0;
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do {
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p = rb_first(&dev->priv.page_root);
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if (p) {
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fwp = rb_entry(p, struct fw_page, rb_node);
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if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
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free_4k(dev, fwp->addr);
|
|
nclaimed = 1;
|
|
} else {
|
|
err = reclaim_pages(dev, fwp->func_id,
|
|
optimal_reclaimed_pages(),
|
|
&nclaimed);
|
|
}
|
|
if (err) {
|
|
mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
|
|
err);
|
|
return err;
|
|
}
|
|
if (nclaimed)
|
|
end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
|
|
}
|
|
if (time_after(jiffies, end)) {
|
|
mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
|
|
break;
|
|
}
|
|
} while (p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
|
|
{
|
|
dev->priv.page_root = RB_ROOT;
|
|
INIT_LIST_HEAD(&dev->priv.free_list);
|
|
}
|
|
|
|
void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
|
|
{
|
|
/* nothing */
|
|
}
|
|
|
|
int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
|
|
{
|
|
dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
|
|
if (!dev->priv.pg_wq)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
|
|
{
|
|
destroy_workqueue(dev->priv.pg_wq);
|
|
}
|