ipath_mr.c

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/*
 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/slab.h>

#include <rdma/ib_umem.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_smi.h>

#include "ipath_verbs.h"

/* Fast memory region */
struct ipath_fmr {
    struct ib_fmr ibfmr;
    u8 page_shift;
    struct ipath_mregion mr;        /* must be last */
};

static inline struct ipath_fmr *to_ifmr(struct ib_fmr *ibfmr)
{
    return container_of(ibfmr, struct ipath_fmr, ibfmr);
}

struct ib_mr *ipath_get_dma_mr(struct ib_pd *pd, int acc)
{
    struct ipath_mr *mr;
    struct ib_mr *ret;

    mr = kzalloc(sizeof *mr, GFP_KERNEL);
    if (!mr) {
        ret = ERR_PTR(-ENOMEM);
        goto bail;
    }

    mr->mr.access_flags = acc;
    ret = &mr->ibmr;

bail:
    return ret;
}

static struct ipath_mr *alloc_mr(int count,
                 struct ipath_lkey_table *lk_table)
{
    struct ipath_mr *mr;
    int m, i = 0;

    /* Allocate struct plus pointers to first level page tables. */
    m = (count + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
    mr = kmalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL);
    if (!mr)
        goto done;

    /* Allocate first level page tables. */
    for (; i < m; i++) {
        mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
        if (!mr->mr.map[i])
            goto bail;
    }
    mr->mr.mapsz = m;

    /*
     * ib_reg_phys_mr() will initialize mr->ibmr except for
     * lkey and rkey.
     */
    if (!ipath_alloc_lkey(lk_table, &mr->mr))
        goto bail;
    mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;

    goto done;

bail:
    while (i) {
        i--;
        kfree(mr->mr.map[i]);
    }
    kfree(mr);
    mr = NULL;

done:
    return mr;
}

struct ib_mr *ipath_reg_phys_mr(struct ib_pd *pd,
                struct ib_phys_buf *buffer_list,
                int num_phys_buf, int acc, u64 *iova_start)
{
    struct ipath_mr *mr;
    int n, m, i;
    struct ib_mr *ret;

    mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table);
    if (mr == NULL) {
        ret = ERR_PTR(-ENOMEM);
        goto bail;
    }

    mr->mr.pd = pd;
    mr->mr.user_base = *iova_start;
    mr->mr.iova = *iova_start;
    mr->mr.length = 0;
    mr->mr.offset = 0;
    mr->mr.access_flags = acc;
    mr->mr.max_segs = num_phys_buf;
    mr->umem = NULL;

    m = 0;
    n = 0;
    for (i = 0; i < num_phys_buf; i++) {
        mr->mr.map[m]->segs[n].vaddr = (void *) buffer_list[i].addr;
        mr->mr.map[m]->segs[n].length = buffer_list[i].size;
        mr->mr.length += buffer_list[i].size;
        n++;
        if (n == IPATH_SEGSZ) {
            m++;
            n = 0;
        }
    }

    ret = &mr->ibmr;

bail:
    return ret;
}

struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
                u64 virt_addr, int mr_access_flags,
                struct ib_udata *udata)
{
    struct ipath_mr *mr;
    struct ib_umem *umem;
    struct ib_umem_chunk *chunk;
    int n, m, i;
    struct ib_mr *ret;

    if (length == 0) {
        ret = ERR_PTR(-EINVAL);
        goto bail;
    }

    umem = ib_umem_get(pd->uobject->context, start, length,
               mr_access_flags, 0);
    if (IS_ERR(umem))
        return (void *) umem;

    n = 0;
    list_for_each_entry(chunk, &umem->chunk_list, list)
        n += chunk->nents;

    mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
    if (!mr) {
        ret = ERR_PTR(-ENOMEM);
        ib_umem_release(umem);
        goto bail;
    }

    mr->mr.pd = pd;
    mr->mr.user_base = start;
    mr->mr.iova = virt_addr;
    mr->mr.length = length;
    mr->mr.offset = umem->offset;
    mr->mr.access_flags = mr_access_flags;
    mr->mr.max_segs = n;
    mr->umem = umem;

    m = 0;
    n = 0;
    list_for_each_entry(chunk, &umem->chunk_list, list) {
        for (i = 0; i < chunk->nents; i++) {
            void *vaddr;

            vaddr = page_address(sg_page(&chunk->page_list[i]));
            if (!vaddr) {
                ret = ERR_PTR(-EINVAL);
                goto bail;
            }
            mr->mr.map[m]->segs[n].vaddr = vaddr;
            mr->mr.map[m]->segs[n].length = umem->page_size;
            n++;
            if (n == IPATH_SEGSZ) {
                m++;
                n = 0;
            }
        }
    }
    ret = &mr->ibmr;

bail:
    return ret;
}

int ipath_dereg_mr(struct ib_mr *ibmr)
{
    struct ipath_mr *mr = to_imr(ibmr);
    int i;

    ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
    i = mr->mr.mapsz;
    while (i) {
        i--;
        kfree(mr->mr.map[i]);
    }

    if (mr->umem)
        ib_umem_release(mr->umem);

    kfree(mr);
    return 0;
}

struct ib_fmr *ipath_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
                   struct ib_fmr_attr *fmr_attr)
{
    struct ipath_fmr *fmr;
    int m, i = 0;
    struct ib_fmr *ret;

    /* Allocate struct plus pointers to first level page tables. */
    m = (fmr_attr->max_pages + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
    fmr = kmalloc(sizeof *fmr + m * sizeof fmr->mr.map[0], GFP_KERNEL);
    if (!fmr)
        goto bail;

    /* Allocate first level page tables. */
    for (; i < m; i++) {
        fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
                     GFP_KERNEL);
        if (!fmr->mr.map[i])
            goto bail;
    }
    fmr->mr.mapsz = m;

    /*
     * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
     * rkey.
     */
    if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
        goto bail;
    fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
    /*
     * Resources are allocated but no valid mapping (RKEY can't be
     * used).
     */
    fmr->mr.pd = pd;
    fmr->mr.user_base = 0;
    fmr->mr.iova = 0;
    fmr->mr.length = 0;
    fmr->mr.offset = 0;
    fmr->mr.access_flags = mr_access_flags;
    fmr->mr.max_segs = fmr_attr->max_pages;
    fmr->page_shift = fmr_attr->page_shift;

    ret = &fmr->ibfmr;
    goto done;

bail:
    while (i)
        kfree(fmr->mr.map[--i]);
    kfree(fmr);
    ret = ERR_PTR(-ENOMEM);

done:
    return ret;
}

int ipath_map_phys_fmr(struct ib_fmr *ibfmr, u64 * page_list,
               int list_len, u64 iova)
{
    struct ipath_fmr *fmr = to_ifmr(ibfmr);
    struct ipath_lkey_table *rkt;
    unsigned long flags;
    int m, n, i;
    u32 ps;
    int ret;

    if (list_len > fmr->mr.max_segs) {
        ret = -EINVAL;
        goto bail;
    }
    rkt = &to_idev(ibfmr->device)->lk_table;
    spin_lock_irqsave(&rkt->lock, flags);
    fmr->mr.user_base = iova;
    fmr->mr.iova = iova;
    ps = 1 << fmr->page_shift;
    fmr->mr.length = list_len * ps;
    m = 0;
    n = 0;
    ps = 1 << fmr->page_shift;
    for (i = 0; i < list_len; i++) {
        fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
        fmr->mr.map[m]->segs[n].length = ps;
        if (++n == IPATH_SEGSZ) {
            m++;
            n = 0;
        }
    }
    spin_unlock_irqrestore(&rkt->lock, flags);
    ret = 0;

bail:
    return ret;
}

int ipath_unmap_fmr(struct list_head *fmr_list)
{
    struct ipath_fmr *fmr;
    struct ipath_lkey_table *rkt;
    unsigned long flags;

    list_for_each_entry(fmr, fmr_list, ibfmr.list) {
        rkt = &to_idev(fmr->ibfmr.device)->lk_table;
        spin_lock_irqsave(&rkt->lock, flags);
        fmr->mr.user_base = 0;
        fmr->mr.iova = 0;
        fmr->mr.length = 0;
        spin_unlock_irqrestore(&rkt->lock, flags);
    }
    return 0;
}

int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
{
    struct ipath_fmr *fmr = to_ifmr(ibfmr);
    int i;

    ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
    i = fmr->mr.mapsz;
    while (i)
        kfree(fmr->mr.map[--i]);
    kfree(fmr);
    return 0;
}