forked from luck/tmp_suning_uos_patched
f2cbb660ed
This patch implements the interposing DMA mapping functions to allow support for IOMMUs and remove the dependence on phys_to_virt() and bus_to_virt(). Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
406 lines
9.6 KiB
C
406 lines
9.6 KiB
C
/*
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* Copyright (c) 2006 QLogic, Inc. All rights reserved.
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* Copyright (c) 2005, 2006 PathScale, Inc. 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 <rdma/ib_pack.h>
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#include <rdma/ib_smi.h>
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#include "ipath_verbs.h"
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/* Fast memory region */
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struct ipath_fmr {
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struct ib_fmr ibfmr;
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u8 page_shift;
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struct ipath_mregion mr; /* must be last */
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};
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static inline struct ipath_fmr *to_ifmr(struct ib_fmr *ibfmr)
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{
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return container_of(ibfmr, struct ipath_fmr, ibfmr);
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}
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/**
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* ipath_get_dma_mr - get a DMA memory region
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* @pd: protection domain for this memory region
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* @acc: access flags
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*
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* Returns the memory region on success, otherwise returns an errno.
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* Note that all DMA addresses should be created via the
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* struct ib_dma_mapping_ops functions (see ipath_dma.c).
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*/
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struct ib_mr *ipath_get_dma_mr(struct ib_pd *pd, int acc)
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{
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struct ipath_mr *mr;
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struct ib_mr *ret;
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mr = kzalloc(sizeof *mr, GFP_KERNEL);
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if (!mr) {
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ret = ERR_PTR(-ENOMEM);
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goto bail;
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}
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mr->mr.access_flags = acc;
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ret = &mr->ibmr;
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bail:
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return ret;
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}
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static struct ipath_mr *alloc_mr(int count,
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struct ipath_lkey_table *lk_table)
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{
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struct ipath_mr *mr;
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int m, i = 0;
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/* Allocate struct plus pointers to first level page tables. */
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m = (count + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
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mr = kmalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL);
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if (!mr)
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goto done;
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/* Allocate first level page tables. */
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for (; i < m; i++) {
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mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
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if (!mr->mr.map[i])
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goto bail;
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}
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mr->mr.mapsz = m;
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/*
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* ib_reg_phys_mr() will initialize mr->ibmr except for
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* lkey and rkey.
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*/
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if (!ipath_alloc_lkey(lk_table, &mr->mr))
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goto bail;
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mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;
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goto done;
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bail:
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while (i) {
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i--;
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kfree(mr->mr.map[i]);
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}
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kfree(mr);
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mr = NULL;
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done:
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return mr;
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}
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/**
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* ipath_reg_phys_mr - register a physical memory region
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* @pd: protection domain for this memory region
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* @buffer_list: pointer to the list of physical buffers to register
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* @num_phys_buf: the number of physical buffers to register
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* @iova_start: the starting address passed over IB which maps to this MR
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*
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* Returns the memory region on success, otherwise returns an errno.
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*/
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struct ib_mr *ipath_reg_phys_mr(struct ib_pd *pd,
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struct ib_phys_buf *buffer_list,
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int num_phys_buf, int acc, u64 *iova_start)
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{
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struct ipath_mr *mr;
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int n, m, i;
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struct ib_mr *ret;
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mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table);
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if (mr == NULL) {
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ret = ERR_PTR(-ENOMEM);
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goto bail;
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}
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mr->mr.pd = pd;
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mr->mr.user_base = *iova_start;
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mr->mr.iova = *iova_start;
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mr->mr.length = 0;
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mr->mr.offset = 0;
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mr->mr.access_flags = acc;
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mr->mr.max_segs = num_phys_buf;
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m = 0;
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n = 0;
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for (i = 0; i < num_phys_buf; i++) {
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mr->mr.map[m]->segs[n].vaddr = (void *) buffer_list[i].addr;
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mr->mr.map[m]->segs[n].length = buffer_list[i].size;
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mr->mr.length += buffer_list[i].size;
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n++;
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if (n == IPATH_SEGSZ) {
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m++;
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n = 0;
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}
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}
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ret = &mr->ibmr;
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bail:
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return ret;
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}
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/**
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* ipath_reg_user_mr - register a userspace memory region
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* @pd: protection domain for this memory region
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* @region: the user memory region
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* @mr_access_flags: access flags for this memory region
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* @udata: unused by the InfiniPath driver
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*
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* Returns the memory region on success, otherwise returns an errno.
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*/
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struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
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int mr_access_flags, struct ib_udata *udata)
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{
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struct ipath_mr *mr;
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struct ib_umem_chunk *chunk;
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int n, m, i;
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struct ib_mr *ret;
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if (region->length == 0) {
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ret = ERR_PTR(-EINVAL);
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goto bail;
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}
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n = 0;
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list_for_each_entry(chunk, ®ion->chunk_list, list)
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n += chunk->nents;
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mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
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if (!mr) {
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ret = ERR_PTR(-ENOMEM);
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goto bail;
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}
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mr->mr.pd = pd;
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mr->mr.user_base = region->user_base;
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mr->mr.iova = region->virt_base;
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mr->mr.length = region->length;
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mr->mr.offset = region->offset;
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mr->mr.access_flags = mr_access_flags;
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mr->mr.max_segs = n;
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m = 0;
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n = 0;
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list_for_each_entry(chunk, ®ion->chunk_list, list) {
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for (i = 0; i < chunk->nmap; i++) {
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mr->mr.map[m]->segs[n].vaddr =
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page_address(chunk->page_list[i].page);
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mr->mr.map[m]->segs[n].length = region->page_size;
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n++;
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if (n == IPATH_SEGSZ) {
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m++;
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n = 0;
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}
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}
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}
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ret = &mr->ibmr;
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bail:
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return ret;
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}
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/**
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* ipath_dereg_mr - unregister and free a memory region
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* @ibmr: the memory region to free
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*
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* Returns 0 on success.
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*
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* Note that this is called to free MRs created by ipath_get_dma_mr()
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* or ipath_reg_user_mr().
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*/
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int ipath_dereg_mr(struct ib_mr *ibmr)
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{
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struct ipath_mr *mr = to_imr(ibmr);
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int i;
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ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
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i = mr->mr.mapsz;
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while (i) {
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i--;
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kfree(mr->mr.map[i]);
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}
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kfree(mr);
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return 0;
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}
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/**
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* ipath_alloc_fmr - allocate a fast memory region
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* @pd: the protection domain for this memory region
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* @mr_access_flags: access flags for this memory region
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* @fmr_attr: fast memory region attributes
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*
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* Returns the memory region on success, otherwise returns an errno.
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*/
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struct ib_fmr *ipath_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
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struct ib_fmr_attr *fmr_attr)
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{
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struct ipath_fmr *fmr;
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int m, i = 0;
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struct ib_fmr *ret;
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/* Allocate struct plus pointers to first level page tables. */
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m = (fmr_attr->max_pages + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
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fmr = kmalloc(sizeof *fmr + m * sizeof fmr->mr.map[0], GFP_KERNEL);
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if (!fmr)
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goto bail;
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/* Allocate first level page tables. */
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for (; i < m; i++) {
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fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
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GFP_KERNEL);
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if (!fmr->mr.map[i])
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goto bail;
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}
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fmr->mr.mapsz = m;
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/*
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* ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
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* rkey.
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*/
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if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
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goto bail;
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fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
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/*
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* Resources are allocated but no valid mapping (RKEY can't be
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* used).
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*/
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fmr->mr.pd = pd;
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fmr->mr.user_base = 0;
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fmr->mr.iova = 0;
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fmr->mr.length = 0;
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fmr->mr.offset = 0;
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fmr->mr.access_flags = mr_access_flags;
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fmr->mr.max_segs = fmr_attr->max_pages;
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fmr->page_shift = fmr_attr->page_shift;
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ret = &fmr->ibfmr;
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goto done;
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bail:
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while (i)
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kfree(fmr->mr.map[--i]);
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kfree(fmr);
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ret = ERR_PTR(-ENOMEM);
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done:
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return ret;
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}
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/**
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* ipath_map_phys_fmr - set up a fast memory region
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* @ibmfr: the fast memory region to set up
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* @page_list: the list of pages to associate with the fast memory region
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* @list_len: the number of pages to associate with the fast memory region
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* @iova: the virtual address of the start of the fast memory region
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*
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* This may be called from interrupt context.
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*/
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int ipath_map_phys_fmr(struct ib_fmr *ibfmr, u64 * page_list,
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int list_len, u64 iova)
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{
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struct ipath_fmr *fmr = to_ifmr(ibfmr);
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struct ipath_lkey_table *rkt;
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unsigned long flags;
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int m, n, i;
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u32 ps;
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int ret;
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if (list_len > fmr->mr.max_segs) {
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ret = -EINVAL;
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goto bail;
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}
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rkt = &to_idev(ibfmr->device)->lk_table;
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spin_lock_irqsave(&rkt->lock, flags);
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fmr->mr.user_base = iova;
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fmr->mr.iova = iova;
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ps = 1 << fmr->page_shift;
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fmr->mr.length = list_len * ps;
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m = 0;
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n = 0;
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ps = 1 << fmr->page_shift;
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for (i = 0; i < list_len; i++) {
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fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
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fmr->mr.map[m]->segs[n].length = ps;
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if (++n == IPATH_SEGSZ) {
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m++;
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n = 0;
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}
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}
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spin_unlock_irqrestore(&rkt->lock, flags);
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ret = 0;
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bail:
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return ret;
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}
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/**
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* ipath_unmap_fmr - unmap fast memory regions
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* @fmr_list: the list of fast memory regions to unmap
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*
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* Returns 0 on success.
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*/
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int ipath_unmap_fmr(struct list_head *fmr_list)
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{
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struct ipath_fmr *fmr;
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struct ipath_lkey_table *rkt;
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unsigned long flags;
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list_for_each_entry(fmr, fmr_list, ibfmr.list) {
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rkt = &to_idev(fmr->ibfmr.device)->lk_table;
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spin_lock_irqsave(&rkt->lock, flags);
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fmr->mr.user_base = 0;
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fmr->mr.iova = 0;
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fmr->mr.length = 0;
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spin_unlock_irqrestore(&rkt->lock, flags);
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}
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return 0;
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}
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/**
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* ipath_dealloc_fmr - deallocate a fast memory region
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* @ibfmr: the fast memory region to deallocate
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*
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* Returns 0 on success.
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*/
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int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
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{
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struct ipath_fmr *fmr = to_ifmr(ibfmr);
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int i;
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ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
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i = fmr->mr.mapsz;
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while (i)
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kfree(fmr->mr.map[--i]);
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kfree(fmr);
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return 0;
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}
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