e5cba24a64
Sponsored by: Mellanox Technologies
221 lines
5.9 KiB
C
221 lines
5.9 KiB
C
/*-
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* Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <linux/module.h>
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#include <rdma/ib_umem.h>
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#include <rdma/ib_umem_odp.h>
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#include "mlx5_ib.h"
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/* @umem: umem object to scan
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* @addr: ib virtual address requested by the user
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* @count: number of PAGE_SIZE pages covered by umem
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* @shift: page shift for the compound pages found in the region
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* @ncont: number of compund pages
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* @order: log2 of the number of compound pages
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*/
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void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr, int *count, int *shift,
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int *ncont, int *order)
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{
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unsigned long tmp;
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unsigned long m;
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int i, k;
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u64 base = 0;
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int p = 0;
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int skip;
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int mask;
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u64 len;
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u64 pfn;
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struct scatterlist *sg;
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int entry;
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unsigned long page_shift = ilog2(umem->page_size);
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/* With ODP we must always match OS page size. */
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if (umem->odp_data) {
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*count = ib_umem_page_count(umem);
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*shift = PAGE_SHIFT;
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*ncont = *count;
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if (order)
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*order = ilog2(roundup_pow_of_two(*count));
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return;
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}
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addr = addr >> page_shift;
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tmp = (unsigned long)addr;
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m = find_first_bit(&tmp, BITS_PER_LONG);
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skip = 1 << m;
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mask = skip - 1;
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i = 0;
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for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
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len = sg_dma_len(sg) >> page_shift;
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pfn = sg_dma_address(sg) >> page_shift;
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for (k = 0; k < len; k++) {
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if (!(i & mask)) {
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tmp = (unsigned long)pfn;
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m = min_t(unsigned long, m, find_first_bit(&tmp, BITS_PER_LONG));
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skip = 1 << m;
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mask = skip - 1;
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base = pfn;
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p = 0;
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} else {
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if (base + p != pfn) {
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tmp = (unsigned long)p;
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m = find_first_bit(&tmp, BITS_PER_LONG);
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skip = 1 << m;
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mask = skip - 1;
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base = pfn;
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p = 0;
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}
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}
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p++;
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i++;
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}
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}
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if (i) {
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m = min_t(unsigned long, ilog2(roundup_pow_of_two(i)), m);
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if (order)
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*order = ilog2(roundup_pow_of_two(i) >> m);
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*ncont = DIV_ROUND_UP(i, (1 << m));
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} else {
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m = 0;
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if (order)
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*order = 0;
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*ncont = 0;
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}
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*shift = page_shift + m;
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*count = i;
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}
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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static u64 umem_dma_to_mtt(dma_addr_t umem_dma)
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{
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u64 mtt_entry = umem_dma & ODP_DMA_ADDR_MASK;
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if (umem_dma & ODP_READ_ALLOWED_BIT)
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mtt_entry |= MLX5_IB_MTT_READ;
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if (umem_dma & ODP_WRITE_ALLOWED_BIT)
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mtt_entry |= MLX5_IB_MTT_WRITE;
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return mtt_entry;
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}
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#endif
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/*
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* Populate the given array with bus addresses from the umem.
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*
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* dev - mlx5_ib device
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* umem - umem to use to fill the pages
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* page_shift - determines the page size used in the resulting array
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* offset - offset into the umem to start from,
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* only implemented for ODP umems
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* num_pages - total number of pages to fill
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* pas - bus addresses array to fill
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* access_flags - access flags to set on all present pages.
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use enum mlx5_ib_mtt_access_flags for this.
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*/
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void __mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
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int page_shift, size_t offset, size_t num_pages,
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__be64 *pas, int access_flags)
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{
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unsigned long umem_page_shift = ilog2(umem->page_size);
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int shift = page_shift - umem_page_shift;
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int mask = (1 << shift) - 1;
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int i, k;
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u64 cur = 0;
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u64 base;
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int len;
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struct scatterlist *sg;
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int entry;
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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const bool odp = umem->odp_data != NULL;
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if (odp) {
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WARN_ON(shift != 0);
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WARN_ON(access_flags != (MLX5_IB_MTT_READ | MLX5_IB_MTT_WRITE));
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for (i = 0; i < num_pages; ++i) {
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dma_addr_t pa = umem->odp_data->dma_list[offset + i];
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pas[i] = cpu_to_be64(umem_dma_to_mtt(pa));
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}
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return;
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}
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#endif
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i = 0;
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for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
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len = sg_dma_len(sg) >> umem_page_shift;
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base = sg_dma_address(sg);
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for (k = 0; k < len; k++) {
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if (!(i & mask)) {
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cur = base + (k << umem_page_shift);
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cur |= access_flags;
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pas[i >> shift] = cpu_to_be64(cur);
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mlx5_ib_dbg(dev, "pas[%d] 0x%llx\n",
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i >> shift, (long long)be64_to_cpu(pas[i >> shift]));
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} else
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mlx5_ib_dbg(dev, "=====> 0x%llx\n",
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(long long)(base + (k << umem_page_shift)));
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i++;
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}
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}
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}
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void mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
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int page_shift, __be64 *pas, int access_flags)
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{
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return __mlx5_ib_populate_pas(dev, umem, page_shift, 0,
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ib_umem_num_pages(umem), pas,
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access_flags);
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}
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int mlx5_ib_get_buf_offset(u64 addr, int page_shift, u32 *offset)
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{
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u64 page_size;
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u64 page_mask;
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u64 off_size;
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u64 off_mask;
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u64 buf_off;
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page_size = (u64)1 << page_shift;
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page_mask = page_size - 1;
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buf_off = addr & page_mask;
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off_size = page_size >> 6;
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off_mask = off_size - 1;
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if (buf_off & off_mask)
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return -EINVAL;
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*offset = buf_off >> ilog2(off_size);
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return 0;
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}
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