Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...

[linux/fpc-iii.git] / drivers / infiniband / hw / cxgb4 / mem.c

/*
 * Copyright (c) 2009-2010 Chelsio, 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/module.h>
#include <linux/moduleparam.h>
#include <rdma/ib_umem.h>
#include <linux/atomic.h>
#include <rdma/ib_user_verbs.h>

#include "iw_cxgb4.h"

int use_dsgl = 0;
module_param(use_dsgl, int, 0644);
MODULE_PARM_DESC(use_dsgl, "Use DSGL for PBL/FastReg (default=0)");

#define T4_ULPTX_MIN_IO 32
#define C4IW_MAX_INLINE_SIZE 96
#define T4_ULPTX_MAX_DMA 1024
#define C4IW_INLINE_THRESHOLD 128

static int inline_threshold = C4IW_INLINE_THRESHOLD;
module_param(inline_threshold, int, 0644);
MODULE_PARM_DESC(inline_threshold, "inline vs dsgl threshold (default=128)");

static int mr_exceeds_hw_limits(struct c4iw_dev *dev, u64 length)
{
        return (is_t4(dev->rdev.lldi.adapter_type) ||
                is_t5(dev->rdev.lldi.adapter_type)) &&
                length >= 8*1024*1024*1024ULL;
}

static int _c4iw_write_mem_dma_aligned(struct c4iw_rdev *rdev, u32 addr,
                                       u32 len, dma_addr_t data, int wait)
{
        struct sk_buff *skb;
        struct ulp_mem_io *req;
        struct ulptx_sgl *sgl;
        u8 wr_len;
        int ret = 0;
        struct c4iw_wr_wait wr_wait;

        addr &= 0x7FFFFFF;

        if (wait)
                c4iw_init_wr_wait(&wr_wait);
        wr_len = roundup(sizeof(*req) + sizeof(*sgl), 16);

        skb = alloc_skb(wr_len, GFP_KERNEL);
        if (!skb)
                return -ENOMEM;
        set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);

        req = (struct ulp_mem_io *)__skb_put(skb, wr_len);
        memset(req, 0, wr_len);
        INIT_ULPTX_WR(req, wr_len, 0, 0);
        req->wr.wr_hi = cpu_to_be32(FW_WR_OP_V(FW_ULPTX_WR) |
                        (wait ? FW_WR_COMPL_F : 0));
        req->wr.wr_lo = wait ? (__force __be64)(unsigned long) &wr_wait : 0L;
        req->wr.wr_mid = cpu_to_be32(FW_WR_LEN16_V(DIV_ROUND_UP(wr_len, 16)));
        req->cmd = cpu_to_be32(ULPTX_CMD_V(ULP_TX_MEM_WRITE));
        req->cmd |= cpu_to_be32(T5_ULP_MEMIO_ORDER_V(1));
        req->dlen = cpu_to_be32(ULP_MEMIO_DATA_LEN_V(len>>5));
        req->len16 = cpu_to_be32(DIV_ROUND_UP(wr_len-sizeof(req->wr), 16));
        req->lock_addr = cpu_to_be32(ULP_MEMIO_ADDR_V(addr));

        sgl = (struct ulptx_sgl *)(req + 1);
        sgl->cmd_nsge = cpu_to_be32(ULPTX_CMD_V(ULP_TX_SC_DSGL) |
                                    ULPTX_NSGE_V(1));
        sgl->len0 = cpu_to_be32(len);
        sgl->addr0 = cpu_to_be64(data);

        ret = c4iw_ofld_send(rdev, skb);
        if (ret)
                return ret;
        if (wait)
                ret = c4iw_wait_for_reply(rdev, &wr_wait, 0, 0, __func__);
        return ret;
}

static int _c4iw_write_mem_inline(struct c4iw_rdev *rdev, u32 addr, u32 len,
                                  void *data)
{
        struct sk_buff *skb;
        struct ulp_mem_io *req;
        struct ulptx_idata *sc;
        u8 wr_len, *to_dp, *from_dp;
        int copy_len, num_wqe, i, ret = 0;
        struct c4iw_wr_wait wr_wait;
        __be32 cmd = cpu_to_be32(ULPTX_CMD_V(ULP_TX_MEM_WRITE));

        if (is_t4(rdev->lldi.adapter_type))
                cmd |= cpu_to_be32(ULP_MEMIO_ORDER_F);
        else
                cmd |= cpu_to_be32(T5_ULP_MEMIO_IMM_F);

        addr &= 0x7FFFFFF;
        PDBG("%s addr 0x%x len %u\n", __func__, addr, len);
        num_wqe = DIV_ROUND_UP(len, C4IW_MAX_INLINE_SIZE);
        c4iw_init_wr_wait(&wr_wait);
        for (i = 0; i < num_wqe; i++) {

                copy_len = len > C4IW_MAX_INLINE_SIZE ? C4IW_MAX_INLINE_SIZE :
                           len;
                wr_len = roundup(sizeof *req + sizeof *sc +
                                 roundup(copy_len, T4_ULPTX_MIN_IO), 16);

                skb = alloc_skb(wr_len, GFP_KERNEL);
                if (!skb)
                        return -ENOMEM;
                set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);

                req = (struct ulp_mem_io *)__skb_put(skb, wr_len);
                memset(req, 0, wr_len);
                INIT_ULPTX_WR(req, wr_len, 0, 0);

                if (i == (num_wqe-1)) {
                        req->wr.wr_hi = cpu_to_be32(FW_WR_OP_V(FW_ULPTX_WR) |
                                                    FW_WR_COMPL_F);
                        req->wr.wr_lo = (__force __be64)(unsigned long)&wr_wait;
                } else
                        req->wr.wr_hi = cpu_to_be32(FW_WR_OP_V(FW_ULPTX_WR));
                req->wr.wr_mid = cpu_to_be32(
                                       FW_WR_LEN16_V(DIV_ROUND_UP(wr_len, 16)));

                req->cmd = cmd;
                req->dlen = cpu_to_be32(ULP_MEMIO_DATA_LEN_V(
                                DIV_ROUND_UP(copy_len, T4_ULPTX_MIN_IO)));
                req->len16 = cpu_to_be32(DIV_ROUND_UP(wr_len-sizeof(req->wr),
                                                      16));
                req->lock_addr = cpu_to_be32(ULP_MEMIO_ADDR_V(addr + i * 3));

                sc = (struct ulptx_idata *)(req + 1);
                sc->cmd_more = cpu_to_be32(ULPTX_CMD_V(ULP_TX_SC_IMM));
                sc->len = cpu_to_be32(roundup(copy_len, T4_ULPTX_MIN_IO));

                to_dp = (u8 *)(sc + 1);
                from_dp = (u8 *)data + i * C4IW_MAX_INLINE_SIZE;
                if (data)
                        memcpy(to_dp, from_dp, copy_len);
                else
                        memset(to_dp, 0, copy_len);
                if (copy_len % T4_ULPTX_MIN_IO)
                        memset(to_dp + copy_len, 0, T4_ULPTX_MIN_IO -
                               (copy_len % T4_ULPTX_MIN_IO));
                ret = c4iw_ofld_send(rdev, skb);
                if (ret)
                        return ret;
                len -= C4IW_MAX_INLINE_SIZE;
        }

        ret = c4iw_wait_for_reply(rdev, &wr_wait, 0, 0, __func__);
        return ret;
}

static int _c4iw_write_mem_dma(struct c4iw_rdev *rdev, u32 addr, u32 len, void *data)
{
        u32 remain = len;
        u32 dmalen;
        int ret = 0;
        dma_addr_t daddr;
        dma_addr_t save;

        daddr = dma_map_single(&rdev->lldi.pdev->dev, data, len, DMA_TO_DEVICE);
        if (dma_mapping_error(&rdev->lldi.pdev->dev, daddr))
                return -1;
        save = daddr;

        while (remain > inline_threshold) {
                if (remain < T4_ULPTX_MAX_DMA) {
                        if (remain & ~T4_ULPTX_MIN_IO)
                                dmalen = remain & ~(T4_ULPTX_MIN_IO-1);
                        else
                                dmalen = remain;
                } else
                        dmalen = T4_ULPTX_MAX_DMA;
                remain -= dmalen;
                ret = _c4iw_write_mem_dma_aligned(rdev, addr, dmalen, daddr,
                                                 !remain);
                if (ret)
                        goto out;
                addr += dmalen >> 5;
                data += dmalen;
                daddr += dmalen;
        }
        if (remain)
                ret = _c4iw_write_mem_inline(rdev, addr, remain, data);
out:
        dma_unmap_single(&rdev->lldi.pdev->dev, save, len, DMA_TO_DEVICE);
        return ret;
}

/*
 * write len bytes of data into addr (32B aligned address)
 * If data is NULL, clear len byte of memory to zero.
 */
static int write_adapter_mem(struct c4iw_rdev *rdev, u32 addr, u32 len,
                             void *data)
{
        if (is_t5(rdev->lldi.adapter_type) && use_dsgl) {
                if (len > inline_threshold) {
                        if (_c4iw_write_mem_dma(rdev, addr, len, data)) {
                                printk_ratelimited(KERN_WARNING
                                                   "%s: dma map"
                                                   " failure (non fatal)\n",
                                                   pci_name(rdev->lldi.pdev));
                                return _c4iw_write_mem_inline(rdev, addr, len,
                                                              data);
                        } else
                                return 0;
                } else
                        return _c4iw_write_mem_inline(rdev, addr, len, data);
        } else
                return _c4iw_write_mem_inline(rdev, addr, len, data);
}

/*
 * Build and write a TPT entry.
 * IN: stag key, pdid, perm, bind_enabled, zbva, to, len, page_size,
 *     pbl_size and pbl_addr
 * OUT: stag index
 */
static int write_tpt_entry(struct c4iw_rdev *rdev, u32 reset_tpt_entry,
                           u32 *stag, u8 stag_state, u32 pdid,
                           enum fw_ri_stag_type type, enum fw_ri_mem_perms perm,
                           int bind_enabled, u32 zbva, u64 to,
                           u64 len, u8 page_size, u32 pbl_size, u32 pbl_addr)
{
        int err;
        struct fw_ri_tpte tpt;
        u32 stag_idx;
        static atomic_t key;

        if (c4iw_fatal_error(rdev))
                return -EIO;

        stag_state = stag_state > 0;
        stag_idx = (*stag) >> 8;

        if ((!reset_tpt_entry) && (*stag == T4_STAG_UNSET)) {
                stag_idx = c4iw_get_resource(&rdev->resource.tpt_table);
                if (!stag_idx) {
                        mutex_lock(&rdev->stats.lock);
                        rdev->stats.stag.fail++;
                        mutex_unlock(&rdev->stats.lock);
                        return -ENOMEM;
                }
                mutex_lock(&rdev->stats.lock);
                rdev->stats.stag.cur += 32;
                if (rdev->stats.stag.cur > rdev->stats.stag.max)
                        rdev->stats.stag.max = rdev->stats.stag.cur;
                mutex_unlock(&rdev->stats.lock);
                *stag = (stag_idx << 8) | (atomic_inc_return(&key) & 0xff);
        }
        PDBG("%s stag_state 0x%0x type 0x%0x pdid 0x%0x, stag_idx 0x%x\n",
             __func__, stag_state, type, pdid, stag_idx);

        /* write TPT entry */
        if (reset_tpt_entry)
                memset(&tpt, 0, sizeof(tpt));
        else {
                tpt.valid_to_pdid = cpu_to_be32(FW_RI_TPTE_VALID_F |
                        FW_RI_TPTE_STAGKEY_V((*stag & FW_RI_TPTE_STAGKEY_M)) |
                        FW_RI_TPTE_STAGSTATE_V(stag_state) |
                        FW_RI_TPTE_STAGTYPE_V(type) | FW_RI_TPTE_PDID_V(pdid));
                tpt.locread_to_qpid = cpu_to_be32(FW_RI_TPTE_PERM_V(perm) |
                        (bind_enabled ? FW_RI_TPTE_MWBINDEN_F : 0) |
                        FW_RI_TPTE_ADDRTYPE_V((zbva ? FW_RI_ZERO_BASED_TO :
                                                      FW_RI_VA_BASED_TO))|
                        FW_RI_TPTE_PS_V(page_size));
                tpt.nosnoop_pbladdr = !pbl_size ? 0 : cpu_to_be32(
                        FW_RI_TPTE_PBLADDR_V(PBL_OFF(rdev, pbl_addr)>>3));
                tpt.len_lo = cpu_to_be32((u32)(len & 0xffffffffUL));
                tpt.va_hi = cpu_to_be32((u32)(to >> 32));
                tpt.va_lo_fbo = cpu_to_be32((u32)(to & 0xffffffffUL));
                tpt.dca_mwbcnt_pstag = cpu_to_be32(0);
                tpt.len_hi = cpu_to_be32((u32)(len >> 32));
        }
        err = write_adapter_mem(rdev, stag_idx +
                                (rdev->lldi.vr->stag.start >> 5),
                                sizeof(tpt), &tpt);

        if (reset_tpt_entry) {
                c4iw_put_resource(&rdev->resource.tpt_table, stag_idx);
                mutex_lock(&rdev->stats.lock);
                rdev->stats.stag.cur -= 32;
                mutex_unlock(&rdev->stats.lock);
        }
        return err;
}

static int write_pbl(struct c4iw_rdev *rdev, __be64 *pbl,
                     u32 pbl_addr, u32 pbl_size)
{
        int err;

        PDBG("%s *pdb_addr 0x%x, pbl_base 0x%x, pbl_size %d\n",
             __func__, pbl_addr, rdev->lldi.vr->pbl.start,
             pbl_size);

        err = write_adapter_mem(rdev, pbl_addr >> 5, pbl_size << 3, pbl);
        return err;
}

static int dereg_mem(struct c4iw_rdev *rdev, u32 stag, u32 pbl_size,
                     u32 pbl_addr)
{
        return write_tpt_entry(rdev, 1, &stag, 0, 0, 0, 0, 0, 0, 0UL, 0, 0,
                               pbl_size, pbl_addr);
}

static int allocate_window(struct c4iw_rdev *rdev, u32 * stag, u32 pdid)
{
        *stag = T4_STAG_UNSET;
        return write_tpt_entry(rdev, 0, stag, 0, pdid, FW_RI_STAG_MW, 0, 0, 0,
                               0UL, 0, 0, 0, 0);
}

static int deallocate_window(struct c4iw_rdev *rdev, u32 stag)
{
        return write_tpt_entry(rdev, 1, &stag, 0, 0, 0, 0, 0, 0, 0UL, 0, 0, 0,
                               0);
}

static int allocate_stag(struct c4iw_rdev *rdev, u32 *stag, u32 pdid,
                         u32 pbl_size, u32 pbl_addr)
{
        *stag = T4_STAG_UNSET;
        return write_tpt_entry(rdev, 0, stag, 0, pdid, FW_RI_STAG_NSMR, 0, 0, 0,
                               0UL, 0, 0, pbl_size, pbl_addr);
}

static int finish_mem_reg(struct c4iw_mr *mhp, u32 stag)
{
        u32 mmid;

        mhp->attr.state = 1;
        mhp->attr.stag = stag;
        mmid = stag >> 8;
        mhp->ibmr.rkey = mhp->ibmr.lkey = stag;
        PDBG("%s mmid 0x%x mhp %p\n", __func__, mmid, mhp);
        return insert_handle(mhp->rhp, &mhp->rhp->mmidr, mhp, mmid);
}

static int register_mem(struct c4iw_dev *rhp, struct c4iw_pd *php,
                      struct c4iw_mr *mhp, int shift)
{
        u32 stag = T4_STAG_UNSET;
        int ret;

        ret = write_tpt_entry(&rhp->rdev, 0, &stag, 1, mhp->attr.pdid,
                              FW_RI_STAG_NSMR, mhp->attr.len ?
                              mhp->attr.perms : 0,
                              mhp->attr.mw_bind_enable, mhp->attr.zbva,
                              mhp->attr.va_fbo, mhp->attr.len ?
                              mhp->attr.len : -1, shift - 12,
                              mhp->attr.pbl_size, mhp->attr.pbl_addr);
        if (ret)
                return ret;

        ret = finish_mem_reg(mhp, stag);
        if (ret)
                dereg_mem(&rhp->rdev, mhp->attr.stag, mhp->attr.pbl_size,
                       mhp->attr.pbl_addr);
        return ret;
}

static int alloc_pbl(struct c4iw_mr *mhp, int npages)
{
        mhp->attr.pbl_addr = c4iw_pblpool_alloc(&mhp->rhp->rdev,
                                                    npages << 3);

        if (!mhp->attr.pbl_addr)
                return -ENOMEM;

        mhp->attr.pbl_size = npages;

        return 0;
}

struct ib_mr *c4iw_get_dma_mr(struct ib_pd *pd, int acc)
{
        struct c4iw_dev *rhp;
        struct c4iw_pd *php;
        struct c4iw_mr *mhp;
        int ret;
        u32 stag = T4_STAG_UNSET;

        PDBG("%s ib_pd %p\n", __func__, pd);
        php = to_c4iw_pd(pd);
        rhp = php->rhp;

        mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
        if (!mhp)
                return ERR_PTR(-ENOMEM);

        mhp->rhp = rhp;
        mhp->attr.pdid = php->pdid;
        mhp->attr.perms = c4iw_ib_to_tpt_access(acc);
        mhp->attr.mw_bind_enable = (acc&IB_ACCESS_MW_BIND) == IB_ACCESS_MW_BIND;
        mhp->attr.zbva = 0;
        mhp->attr.va_fbo = 0;
        mhp->attr.page_size = 0;
        mhp->attr.len = ~0ULL;
        mhp->attr.pbl_size = 0;

        ret = write_tpt_entry(&rhp->rdev, 0, &stag, 1, php->pdid,
                              FW_RI_STAG_NSMR, mhp->attr.perms,
                              mhp->attr.mw_bind_enable, 0, 0, ~0ULL, 0, 0, 0);
        if (ret)
                goto err1;

        ret = finish_mem_reg(mhp, stag);
        if (ret)
                goto err2;
        return &mhp->ibmr;
err2:
        dereg_mem(&rhp->rdev, mhp->attr.stag, mhp->attr.pbl_size,
                  mhp->attr.pbl_addr);
err1:
        kfree(mhp);
        return ERR_PTR(ret);
}

struct ib_mr *c4iw_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
                               u64 virt, int acc, struct ib_udata *udata)
{
        __be64 *pages;
        int shift, n, len;
        int i, k, entry;
        int err = 0;
        struct scatterlist *sg;
        struct c4iw_dev *rhp;
        struct c4iw_pd *php;
        struct c4iw_mr *mhp;

        PDBG("%s ib_pd %p\n", __func__, pd);

        if (length == ~0ULL)
                return ERR_PTR(-EINVAL);

        if ((length + start) < start)
                return ERR_PTR(-EINVAL);

        php = to_c4iw_pd(pd);
        rhp = php->rhp;

        if (mr_exceeds_hw_limits(rhp, length))
                return ERR_PTR(-EINVAL);

        mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
        if (!mhp)
                return ERR_PTR(-ENOMEM);

        mhp->rhp = rhp;

        mhp->umem = ib_umem_get(pd->uobject->context, start, length, acc, 0);
        if (IS_ERR(mhp->umem)) {
                err = PTR_ERR(mhp->umem);
                kfree(mhp);
                return ERR_PTR(err);
        }

        shift = ffs(mhp->umem->page_size) - 1;

        n = mhp->umem->nmap;
        err = alloc_pbl(mhp, n);
        if (err)
                goto err;

        pages = (__be64 *) __get_free_page(GFP_KERNEL);
        if (!pages) {
                err = -ENOMEM;
                goto err_pbl;
        }

        i = n = 0;

        for_each_sg(mhp->umem->sg_head.sgl, sg, mhp->umem->nmap, entry) {
                len = sg_dma_len(sg) >> shift;
                for (k = 0; k < len; ++k) {
                        pages[i++] = cpu_to_be64(sg_dma_address(sg) +
                                mhp->umem->page_size * k);
                        if (i == PAGE_SIZE / sizeof *pages) {
                                err = write_pbl(&mhp->rhp->rdev,
                                      pages,
                                      mhp->attr.pbl_addr + (n << 3), i);
                                if (err)
                                        goto pbl_done;
                                n += i;
                                i = 0;
                        }
                }
        }

        if (i)
                err = write_pbl(&mhp->rhp->rdev, pages,
                                     mhp->attr.pbl_addr + (n << 3), i);

pbl_done:
        free_page((unsigned long) pages);
        if (err)
                goto err_pbl;

        mhp->attr.pdid = php->pdid;
        mhp->attr.zbva = 0;
        mhp->attr.perms = c4iw_ib_to_tpt_access(acc);
        mhp->attr.va_fbo = virt;
        mhp->attr.page_size = shift - 12;
        mhp->attr.len = length;

        err = register_mem(rhp, php, mhp, shift);
        if (err)
                goto err_pbl;

        return &mhp->ibmr;

err_pbl:
        c4iw_pblpool_free(&mhp->rhp->rdev, mhp->attr.pbl_addr,
                              mhp->attr.pbl_size << 3);

err:
        ib_umem_release(mhp->umem);
        kfree(mhp);
        return ERR_PTR(err);
}

struct ib_mw *c4iw_alloc_mw(struct ib_pd *pd, enum ib_mw_type type,
                            struct ib_udata *udata)
{
        struct c4iw_dev *rhp;
        struct c4iw_pd *php;
        struct c4iw_mw *mhp;
        u32 mmid;
        u32 stag = 0;
        int ret;

        if (type != IB_MW_TYPE_1)
                return ERR_PTR(-EINVAL);

        php = to_c4iw_pd(pd);
        rhp = php->rhp;
        mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
        if (!mhp)
                return ERR_PTR(-ENOMEM);
        ret = allocate_window(&rhp->rdev, &stag, php->pdid);
        if (ret) {
                kfree(mhp);
                return ERR_PTR(ret);
        }
        mhp->rhp = rhp;
        mhp->attr.pdid = php->pdid;
        mhp->attr.type = FW_RI_STAG_MW;
        mhp->attr.stag = stag;
        mmid = (stag) >> 8;
        mhp->ibmw.rkey = stag;
        if (insert_handle(rhp, &rhp->mmidr, mhp, mmid)) {
                deallocate_window(&rhp->rdev, mhp->attr.stag);
                kfree(mhp);
                return ERR_PTR(-ENOMEM);
        }
        PDBG("%s mmid 0x%x mhp %p stag 0x%x\n", __func__, mmid, mhp, stag);
        return &(mhp->ibmw);
}

int c4iw_dealloc_mw(struct ib_mw *mw)
{
        struct c4iw_dev *rhp;
        struct c4iw_mw *mhp;
        u32 mmid;

        mhp = to_c4iw_mw(mw);
        rhp = mhp->rhp;
        mmid = (mw->rkey) >> 8;
        remove_handle(rhp, &rhp->mmidr, mmid);
        deallocate_window(&rhp->rdev, mhp->attr.stag);
        kfree(mhp);
        PDBG("%s ib_mw %p mmid 0x%x ptr %p\n", __func__, mw, mmid, mhp);
        return 0;
}

struct ib_mr *c4iw_alloc_mr(struct ib_pd *pd,
                            enum ib_mr_type mr_type,
                            u32 max_num_sg)
{
        struct c4iw_dev *rhp;
        struct c4iw_pd *php;
        struct c4iw_mr *mhp;
        u32 mmid;
        u32 stag = 0;
        int ret = 0;
        int length = roundup(max_num_sg * sizeof(u64), 32);

        php = to_c4iw_pd(pd);
        rhp = php->rhp;

        if (mr_type != IB_MR_TYPE_MEM_REG ||
            max_num_sg > t4_max_fr_depth(&rhp->rdev.lldi.ulptx_memwrite_dsgl &&
                                         use_dsgl))
                return ERR_PTR(-EINVAL);

        mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
        if (!mhp) {
                ret = -ENOMEM;
                goto err;
        }

        mhp->mpl = dma_alloc_coherent(&rhp->rdev.lldi.pdev->dev,
                                      length, &mhp->mpl_addr, GFP_KERNEL);
        if (!mhp->mpl) {
                ret = -ENOMEM;
                goto err_mpl;
        }
        mhp->max_mpl_len = length;

        mhp->rhp = rhp;
        ret = alloc_pbl(mhp, max_num_sg);
        if (ret)
                goto err1;
        mhp->attr.pbl_size = max_num_sg;
        ret = allocate_stag(&rhp->rdev, &stag, php->pdid,
                                 mhp->attr.pbl_size, mhp->attr.pbl_addr);
        if (ret)
                goto err2;
        mhp->attr.pdid = php->pdid;
        mhp->attr.type = FW_RI_STAG_NSMR;
        mhp->attr.stag = stag;
        mhp->attr.state = 1;
        mmid = (stag) >> 8;
        mhp->ibmr.rkey = mhp->ibmr.lkey = stag;
        if (insert_handle(rhp, &rhp->mmidr, mhp, mmid)) {
                ret = -ENOMEM;
                goto err3;
        }

        PDBG("%s mmid 0x%x mhp %p stag 0x%x\n", __func__, mmid, mhp, stag);
        return &(mhp->ibmr);
err3:
        dereg_mem(&rhp->rdev, stag, mhp->attr.pbl_size,
                       mhp->attr.pbl_addr);
err2:
        c4iw_pblpool_free(&mhp->rhp->rdev, mhp->attr.pbl_addr,
                              mhp->attr.pbl_size << 3);
err1:
        dma_free_coherent(&mhp->rhp->rdev.lldi.pdev->dev,
                          mhp->max_mpl_len, mhp->mpl, mhp->mpl_addr);
err_mpl:
        kfree(mhp);
err:
        return ERR_PTR(ret);
}

static int c4iw_set_page(struct ib_mr *ibmr, u64 addr)
{
        struct c4iw_mr *mhp = to_c4iw_mr(ibmr);

        if (unlikely(mhp->mpl_len == mhp->max_mpl_len))
                return -ENOMEM;

        mhp->mpl[mhp->mpl_len++] = addr;

        return 0;
}

int c4iw_map_mr_sg(struct ib_mr *ibmr,
                   struct scatterlist *sg,
                   int sg_nents)
{
        struct c4iw_mr *mhp = to_c4iw_mr(ibmr);

        mhp->mpl_len = 0;

        return ib_sg_to_pages(ibmr, sg, sg_nents, c4iw_set_page);
}

int c4iw_dereg_mr(struct ib_mr *ib_mr)
{
        struct c4iw_dev *rhp;
        struct c4iw_mr *mhp;
        u32 mmid;

        PDBG("%s ib_mr %p\n", __func__, ib_mr);

        mhp = to_c4iw_mr(ib_mr);
        rhp = mhp->rhp;
        mmid = mhp->attr.stag >> 8;
        remove_handle(rhp, &rhp->mmidr, mmid);
        if (mhp->mpl)
                dma_free_coherent(&mhp->rhp->rdev.lldi.pdev->dev,
                                  mhp->max_mpl_len, mhp->mpl, mhp->mpl_addr);
        dereg_mem(&rhp->rdev, mhp->attr.stag, mhp->attr.pbl_size,
                       mhp->attr.pbl_addr);
        if (mhp->attr.pbl_size)
                c4iw_pblpool_free(&mhp->rhp->rdev, mhp->attr.pbl_addr,
                                  mhp->attr.pbl_size << 3);
        if (mhp->kva)
                kfree((void *) (unsigned long) mhp->kva);
        if (mhp->umem)
                ib_umem_release(mhp->umem);
        PDBG("%s mmid 0x%x ptr %p\n", __func__, mmid, mhp);
        kfree(mhp);
        return 0;
}