235 lines
6.1 KiB
C
235 lines
6.1 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/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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* @max_page_shift: high limit for page_shift - 0 means no limit
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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,
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unsigned long max_page_shift,
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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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u64 base = ~0, p = 0;
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u64 len, pfn;
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int i = 0;
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struct scatterlist *sg;
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int entry;
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unsigned long page_shift = umem->page_shift;
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if (umem->odp_data) {
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*ncont = ib_umem_page_count(umem);
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*count = *ncont << (page_shift - PAGE_SHIFT);
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*shift = page_shift;
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if (order)
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*order = ilog2(roundup_pow_of_two(*ncont));
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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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if (max_page_shift)
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m = min_t(unsigned long, max_page_shift - page_shift, m);
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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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if (base + p != pfn) {
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/* If either the offset or the new
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* base are unaligned update m
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*/
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tmp = (unsigned long)(pfn | p);
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if (!IS_ALIGNED(tmp, 1 << m))
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m = find_first_bit(&tmp, BITS_PER_LONG);
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base = pfn;
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p = 0;
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}
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p += len;
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i += len;
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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 = umem->page_shift;
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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, idx;
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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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/* Skip elements below offset */
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if (i + len < offset << shift) {
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i += len;
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continue;
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}
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/* Skip pages below offset */
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if (i < offset << shift) {
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k = (offset << shift) - i;
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i = offset << shift;
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} else {
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k = 0;
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}
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for (; 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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idx = (i >> shift) - offset;
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pas[idx] = cpu_to_be64(cur);
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mlx5_ib_dbg(dev, "pas[%d] 0x%llx\n",
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i >> shift, be64_to_cpu(pas[idx]));
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}
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i++;
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/* Stop after num_pages reached */
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if (i >> shift >= offset + num_pages)
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return;
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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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