198 lines
6 KiB
C
198 lines
6 KiB
C
#ifndef DEF_RDMAVT_INCMR_H
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#define DEF_RDMAVT_INCMR_H
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/*
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* Copyright(c) 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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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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*
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* - 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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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* For Memory Regions. This stuff should probably be moved into rdmavt/mr.h once
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* drivers no longer need access to the MR directly.
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*/
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#include <linux/percpu-refcount.h>
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/*
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* A segment is a linear region of low physical memory.
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* Used by the verbs layer.
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*/
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struct rvt_seg {
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void *vaddr;
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size_t length;
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};
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/* The number of rvt_segs that fit in a page. */
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#define RVT_SEGSZ (PAGE_SIZE / sizeof(struct rvt_seg))
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struct rvt_segarray {
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struct rvt_seg segs[RVT_SEGSZ];
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};
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struct rvt_mregion {
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struct ib_pd *pd; /* shares refcnt of ibmr.pd */
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u64 user_base; /* User's address for this region */
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u64 iova; /* IB start address of this region */
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size_t length;
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u32 lkey;
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u32 offset; /* offset (bytes) to start of region */
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int access_flags;
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u32 max_segs; /* number of rvt_segs in all the arrays */
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u32 mapsz; /* size of the map array */
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atomic_t lkey_invalid; /* true if current lkey is invalid */
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u8 page_shift; /* 0 - non unform/non powerof2 sizes */
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u8 lkey_published; /* in global table */
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struct percpu_ref refcount;
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struct completion comp; /* complete when refcount goes to zero */
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struct rvt_segarray *map[0]; /* the segments */
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};
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#define RVT_MAX_LKEY_TABLE_BITS 23
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struct rvt_lkey_table {
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/* read mostly fields */
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u32 max; /* size of the table */
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u32 shift; /* lkey/rkey shift */
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struct rvt_mregion __rcu **table;
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/* writeable fields */
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/* protect changes in this struct */
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spinlock_t lock ____cacheline_aligned_in_smp;
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u32 next; /* next unused index (speeds search) */
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u32 gen; /* generation count */
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};
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/*
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* These keep track of the copy progress within a memory region.
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* Used by the verbs layer.
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*/
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struct rvt_sge {
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struct rvt_mregion *mr;
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void *vaddr; /* kernel virtual address of segment */
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u32 sge_length; /* length of the SGE */
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u32 length; /* remaining length of the segment */
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u16 m; /* current index: mr->map[m] */
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u16 n; /* current index: mr->map[m]->segs[n] */
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};
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struct rvt_sge_state {
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struct rvt_sge *sg_list; /* next SGE to be used if any */
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struct rvt_sge sge; /* progress state for the current SGE */
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u32 total_len;
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u8 num_sge;
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};
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static inline void rvt_put_mr(struct rvt_mregion *mr)
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{
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percpu_ref_put(&mr->refcount);
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}
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static inline void rvt_get_mr(struct rvt_mregion *mr)
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{
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percpu_ref_get(&mr->refcount);
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}
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static inline void rvt_put_ss(struct rvt_sge_state *ss)
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{
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while (ss->num_sge) {
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rvt_put_mr(ss->sge.mr);
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if (--ss->num_sge)
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ss->sge = *ss->sg_list++;
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}
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}
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static inline u32 rvt_get_sge_length(struct rvt_sge *sge, u32 length)
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{
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u32 len = sge->length;
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if (len > length)
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len = length;
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if (len > sge->sge_length)
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len = sge->sge_length;
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return len;
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}
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static inline void rvt_update_sge(struct rvt_sge_state *ss, u32 length,
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bool release)
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{
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struct rvt_sge *sge = &ss->sge;
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sge->vaddr += length;
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sge->length -= length;
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sge->sge_length -= length;
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if (sge->sge_length == 0) {
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if (release)
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rvt_put_mr(sge->mr);
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if (--ss->num_sge)
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*sge = *ss->sg_list++;
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} else if (sge->length == 0 && sge->mr->lkey) {
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if (++sge->n >= RVT_SEGSZ) {
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if (++sge->m >= sge->mr->mapsz)
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return;
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sge->n = 0;
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}
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sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
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sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
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}
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}
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static inline void rvt_skip_sge(struct rvt_sge_state *ss, u32 length,
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bool release)
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{
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struct rvt_sge *sge = &ss->sge;
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while (length) {
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u32 len = rvt_get_sge_length(sge, length);
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WARN_ON_ONCE(len == 0);
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rvt_update_sge(ss, len, release);
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length -= len;
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}
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}
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bool rvt_ss_has_lkey(struct rvt_sge_state *ss, u32 lkey);
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bool rvt_mr_has_lkey(struct rvt_mregion *mr, u32 lkey);
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#endif /* DEF_RDMAVT_INCMRH */
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