ehea_qmr.c

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/*
 *  linux/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
 *
 *  eHEA ethernet device driver for IBM eServer System p
 *
 *  (C) Copyright IBM Corp. 2006
 *
 *  Authors:
 *       Christoph Raisch <[email protected]>
 *       Jan-Bernd Themann <[email protected]>
 *       Thomas Klein <[email protected]>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/mm.h>
#include <linux/slab.h>
#include "ehea.h"
#include "ehea_phyp.h"
#include "ehea_qmr.h"

static struct ehea_bmap *ehea_bmap;

static void *hw_qpageit_get_inc(struct hw_queue *queue)
{
    void *retvalue = hw_qeit_get(queue);

    queue->current_q_offset += queue->pagesize;
    if (queue->current_q_offset > queue->queue_length) {
        queue->current_q_offset -= queue->pagesize;
        retvalue = NULL;
    } else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
        pr_err("not on pageboundary\n");
        retvalue = NULL;
    }
    return retvalue;
}

static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
              const u32 pagesize, const u32 qe_size)
{
    int pages_per_kpage = PAGE_SIZE / pagesize;
    int i, k;

    if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
        pr_err("pagesize conflict! kernel pagesize=%d, ehea pagesize=%d\n",
               (int)PAGE_SIZE, (int)pagesize);
        return -EINVAL;
    }

    queue->queue_length = nr_of_pages * pagesize;
    queue->queue_pages = kmalloc(nr_of_pages * sizeof(void *), GFP_KERNEL);
    if (!queue->queue_pages) {
        pr_err("no mem for queue_pages\n");
        return -ENOMEM;
    }

    /*
     * allocate pages for queue:
     * outer loop allocates whole kernel pages (page aligned) and
     * inner loop divides a kernel page into smaller hea queue pages
     */
    i = 0;
    while (i < nr_of_pages) {
        u8 *kpage = (u8 *)get_zeroed_page(GFP_KERNEL);
        if (!kpage)
            goto out_nomem;
        for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
            (queue->queue_pages)[i] = (struct ehea_page *)kpage;
            kpage += pagesize;
            i++;
        }
    }

    queue->current_q_offset = 0;
    queue->qe_size = qe_size;
    queue->pagesize = pagesize;
    queue->toggle_state = 1;

    return 0;
out_nomem:
    for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
        if (!(queue->queue_pages)[i])
            break;
        free_page((unsigned long)(queue->queue_pages)[i]);
    }
    return -ENOMEM;
}

static void hw_queue_dtor(struct hw_queue *queue)
{
    int pages_per_kpage = PAGE_SIZE / queue->pagesize;
    int i, nr_pages;

    if (!queue || !queue->queue_pages)
        return;

    nr_pages = queue->queue_length / queue->pagesize;

    for (i = 0; i < nr_pages; i += pages_per_kpage)
        free_page((unsigned long)(queue->queue_pages)[i]);

    kfree(queue->queue_pages);
}

struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
                   int nr_of_cqe, u64 eq_handle, u32 cq_token)
{
    struct ehea_cq *cq;
    struct h_epa epa;
    u64 *cq_handle_ref, hret, rpage;
    u32 act_nr_of_entries, act_pages, counter;
    int ret;
    void *vpage;

    cq = kzalloc(sizeof(*cq), GFP_KERNEL);
    if (!cq) {
        pr_err("no mem for cq\n");
        goto out_nomem;
    }

    cq->attr.max_nr_of_cqes = nr_of_cqe;
    cq->attr.cq_token = cq_token;
    cq->attr.eq_handle = eq_handle;

    cq->adapter = adapter;

    cq_handle_ref = &cq->fw_handle;
    act_nr_of_entries = 0;
    act_pages = 0;

    hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
                    &cq->fw_handle, &cq->epas);
    if (hret != H_SUCCESS) {
        pr_err("alloc_resource_cq failed\n");
        goto out_freemem;
    }

    ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
                EHEA_PAGESIZE, sizeof(struct ehea_cqe));
    if (ret)
        goto out_freeres;

    for (counter = 0; counter < cq->attr.nr_pages; counter++) {
        vpage = hw_qpageit_get_inc(&cq->hw_queue);
        if (!vpage) {
            pr_err("hw_qpageit_get_inc failed\n");
            goto out_kill_hwq;
        }

        rpage = __pa(vpage);
        hret = ehea_h_register_rpage(adapter->handle,
                         0, EHEA_CQ_REGISTER_ORIG,
                         cq->fw_handle, rpage, 1);
        if (hret < H_SUCCESS) {
            pr_err("register_rpage_cq failed ehea_cq=%p hret=%llx counter=%i act_pages=%i\n",
                   cq, hret, counter, cq->attr.nr_pages);
            goto out_kill_hwq;
        }

        if (counter == (cq->attr.nr_pages - 1)) {
            vpage = hw_qpageit_get_inc(&cq->hw_queue);

            if ((hret != H_SUCCESS) || (vpage)) {
                pr_err("registration of pages not complete hret=%llx\n",
                       hret);
                goto out_kill_hwq;
            }
        } else {
            if (hret != H_PAGE_REGISTERED) {
                pr_err("CQ: registration of page failed hret=%llx\n",
                       hret);
                goto out_kill_hwq;
            }
        }
    }

    hw_qeit_reset(&cq->hw_queue);
    epa = cq->epas.kernel;
    ehea_reset_cq_ep(cq);
    ehea_reset_cq_n1(cq);

    return cq;

out_kill_hwq:
    hw_queue_dtor(&cq->hw_queue);

out_freeres:
    ehea_h_free_resource(adapter->handle, cq->fw_handle, FORCE_FREE);

out_freemem:
    kfree(cq);

out_nomem:
    return NULL;
}

static u64 ehea_destroy_cq_res(struct ehea_cq *cq, u64 force)
{
    u64 hret;
    u64 adapter_handle = cq->adapter->handle;

    /* deregister all previous registered pages */
    hret = ehea_h_free_resource(adapter_handle, cq->fw_handle, force);
    if (hret != H_SUCCESS)
        return hret;

    hw_queue_dtor(&cq->hw_queue);
    kfree(cq);

    return hret;
}

int ehea_destroy_cq(struct ehea_cq *cq)
{
    u64 hret, aer, aerr;
    if (!cq)
        return 0;

    hcp_epas_dtor(&cq->epas);
    hret = ehea_destroy_cq_res(cq, NORMAL_FREE);
    if (hret == H_R_STATE) {
        ehea_error_data(cq->adapter, cq->fw_handle, &aer, &aerr);
        hret = ehea_destroy_cq_res(cq, FORCE_FREE);
    }

    if (hret != H_SUCCESS) {
        pr_err("destroy CQ failed\n");
        return -EIO;
    }

    return 0;
}

struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
                   const enum ehea_eq_type type,
                   const u32 max_nr_of_eqes, const u8 eqe_gen)
{
    int ret, i;
    u64 hret, rpage;
    void *vpage;
    struct ehea_eq *eq;

    eq = kzalloc(sizeof(*eq), GFP_KERNEL);
    if (!eq) {
        pr_err("no mem for eq\n");
        return NULL;
    }

    eq->adapter = adapter;
    eq->attr.type = type;
    eq->attr.max_nr_of_eqes = max_nr_of_eqes;
    eq->attr.eqe_gen = eqe_gen;
    spin_lock_init(&eq->spinlock);

    hret = ehea_h_alloc_resource_eq(adapter->handle,
                    &eq->attr, &eq->fw_handle);
    if (hret != H_SUCCESS) {
        pr_err("alloc_resource_eq failed\n");
        goto out_freemem;
    }

    ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
                EHEA_PAGESIZE, sizeof(struct ehea_eqe));
    if (ret) {
        pr_err("can't allocate eq pages\n");
        goto out_freeres;
    }

    for (i = 0; i < eq->attr.nr_pages; i++) {
        vpage = hw_qpageit_get_inc(&eq->hw_queue);
        if (!vpage) {
            pr_err("hw_qpageit_get_inc failed\n");
            hret = H_RESOURCE;
            goto out_kill_hwq;
        }

        rpage = __pa(vpage);

        hret = ehea_h_register_rpage(adapter->handle, 0,
                         EHEA_EQ_REGISTER_ORIG,
                         eq->fw_handle, rpage, 1);

        if (i == (eq->attr.nr_pages - 1)) {
            /* last page */
            vpage = hw_qpageit_get_inc(&eq->hw_queue);
            if ((hret != H_SUCCESS) || (vpage))
                goto out_kill_hwq;

        } else {
            if (hret != H_PAGE_REGISTERED)
                goto out_kill_hwq;

        }
    }

    hw_qeit_reset(&eq->hw_queue);
    return eq;

out_kill_hwq:
    hw_queue_dtor(&eq->hw_queue);

out_freeres:
    ehea_h_free_resource(adapter->handle, eq->fw_handle, FORCE_FREE);

out_freemem:
    kfree(eq);
    return NULL;
}

struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
{
    struct ehea_eqe *eqe;
    unsigned long flags;

    spin_lock_irqsave(&eq->spinlock, flags);
    eqe = hw_eqit_eq_get_inc_valid(&eq->hw_queue);
    spin_unlock_irqrestore(&eq->spinlock, flags);

    return eqe;
}

static u64 ehea_destroy_eq_res(struct ehea_eq *eq, u64 force)
{
    u64 hret;
    unsigned long flags;

    spin_lock_irqsave(&eq->spinlock, flags);

    hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle, force);
    spin_unlock_irqrestore(&eq->spinlock, flags);

    if (hret != H_SUCCESS)
        return hret;

    hw_queue_dtor(&eq->hw_queue);
    kfree(eq);

    return hret;
}

int ehea_destroy_eq(struct ehea_eq *eq)
{
    u64 hret, aer, aerr;
    if (!eq)
        return 0;

    hcp_epas_dtor(&eq->epas);

    hret = ehea_destroy_eq_res(eq, NORMAL_FREE);
    if (hret == H_R_STATE) {
        ehea_error_data(eq->adapter, eq->fw_handle, &aer, &aerr);
        hret = ehea_destroy_eq_res(eq, FORCE_FREE);
    }

    if (hret != H_SUCCESS) {
        pr_err("destroy EQ failed\n");
        return -EIO;
    }

    return 0;
}

/* allocates memory for a queue and registers pages in phyp */
static int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
               int nr_pages, int wqe_size, int act_nr_sges,
               struct ehea_adapter *adapter, int h_call_q_selector)
{
    u64 hret, rpage;
    int ret, cnt;
    void *vpage;

    ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
    if (ret)
        return ret;

    for (cnt = 0; cnt < nr_pages; cnt++) {
        vpage = hw_qpageit_get_inc(hw_queue);
        if (!vpage) {
            pr_err("hw_qpageit_get_inc failed\n");
            goto out_kill_hwq;
        }
        rpage = __pa(vpage);
        hret = ehea_h_register_rpage(adapter->handle,
                         0, h_call_q_selector,
                         qp->fw_handle, rpage, 1);
        if (hret < H_SUCCESS) {
            pr_err("register_rpage_qp failed\n");
            goto out_kill_hwq;
        }
    }
    hw_qeit_reset(hw_queue);
    return 0;

out_kill_hwq:
    hw_queue_dtor(hw_queue);
    return -EIO;
}

static inline u32 map_wqe_size(u8 wqe_enc_size)
{
    return 128 << wqe_enc_size;
}

struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
                   u32 pd, struct ehea_qp_init_attr *init_attr)
{
    int ret;
    u64 hret;
    struct ehea_qp *qp;
    u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
    u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;


    qp = kzalloc(sizeof(*qp), GFP_KERNEL);
    if (!qp) {
        pr_err("no mem for qp\n");
        return NULL;
    }

    qp->adapter = adapter;

    hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
                    &qp->fw_handle, &qp->epas);
    if (hret != H_SUCCESS) {
        pr_err("ehea_h_alloc_resource_qp failed\n");
        goto out_freemem;
    }

    wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
    wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
    wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
    wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);

    ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
                     wqe_size_in_bytes_sq,
                     init_attr->act_wqe_size_enc_sq, adapter,
                     0);
    if (ret) {
        pr_err("can't register for sq ret=%x\n", ret);
        goto out_freeres;
    }

    ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
                     init_attr->nr_rq1_pages,
                     wqe_size_in_bytes_rq1,
                     init_attr->act_wqe_size_enc_rq1,
                     adapter, 1);
    if (ret) {
        pr_err("can't register for rq1 ret=%x\n", ret);
        goto out_kill_hwsq;
    }

    if (init_attr->rq_count > 1) {
        ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
                         init_attr->nr_rq2_pages,
                         wqe_size_in_bytes_rq2,
                         init_attr->act_wqe_size_enc_rq2,
                         adapter, 2);
        if (ret) {
            pr_err("can't register for rq2 ret=%x\n", ret);
            goto out_kill_hwr1q;
        }
    }

    if (init_attr->rq_count > 2) {
        ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
                         init_attr->nr_rq3_pages,
                         wqe_size_in_bytes_rq3,
                         init_attr->act_wqe_size_enc_rq3,
                         adapter, 3);
        if (ret) {
            pr_err("can't register for rq3 ret=%x\n", ret);
            goto out_kill_hwr2q;
        }
    }

    qp->init_attr = *init_attr;

    return qp;

out_kill_hwr2q:
    hw_queue_dtor(&qp->hw_rqueue2);

out_kill_hwr1q:
    hw_queue_dtor(&qp->hw_rqueue1);

out_kill_hwsq:
    hw_queue_dtor(&qp->hw_squeue);

out_freeres:
    ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
    ehea_h_free_resource(adapter->handle, qp->fw_handle, FORCE_FREE);

out_freemem:
    kfree(qp);
    return NULL;
}

static u64 ehea_destroy_qp_res(struct ehea_qp *qp, u64 force)
{
    u64 hret;
    struct ehea_qp_init_attr *qp_attr = &qp->init_attr;


    ehea_h_disable_and_get_hea(qp->adapter->handle, qp->fw_handle);
    hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle, force);
    if (hret != H_SUCCESS)
        return hret;

    hw_queue_dtor(&qp->hw_squeue);
    hw_queue_dtor(&qp->hw_rqueue1);

    if (qp_attr->rq_count > 1)
        hw_queue_dtor(&qp->hw_rqueue2);
    if (qp_attr->rq_count > 2)
        hw_queue_dtor(&qp->hw_rqueue3);
    kfree(qp);

    return hret;
}

int ehea_destroy_qp(struct ehea_qp *qp)
{
    u64 hret, aer, aerr;
    if (!qp)
        return 0;

    hcp_epas_dtor(&qp->epas);

    hret = ehea_destroy_qp_res(qp, NORMAL_FREE);
    if (hret == H_R_STATE) {
        ehea_error_data(qp->adapter, qp->fw_handle, &aer, &aerr);
        hret = ehea_destroy_qp_res(qp, FORCE_FREE);
    }

    if (hret != H_SUCCESS) {
        pr_err("destroy QP failed\n");
        return -EIO;
    }

    return 0;
}

static inline int ehea_calc_index(unsigned long i, unsigned long s)
{
    return (i >> s) & EHEA_INDEX_MASK;
}

static inline int ehea_init_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
                     int dir)
{
    if (!ehea_top_bmap->dir[dir]) {
        ehea_top_bmap->dir[dir] =
            kzalloc(sizeof(struct ehea_dir_bmap), GFP_KERNEL);
        if (!ehea_top_bmap->dir[dir])
            return -ENOMEM;
    }
    return 0;
}

static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
{
    if (!ehea_bmap->top[top]) {
        ehea_bmap->top[top] =
            kzalloc(sizeof(struct ehea_top_bmap), GFP_KERNEL);
        if (!ehea_bmap->top[top])
            return -ENOMEM;
    }
    return ehea_init_top_bmap(ehea_bmap->top[top], dir);
}

static DEFINE_MUTEX(ehea_busmap_mutex);
static unsigned long ehea_mr_len;

#define EHEA_BUSMAP_ADD_SECT 1
#define EHEA_BUSMAP_REM_SECT 0

static void ehea_rebuild_busmap(void)
{
    u64 vaddr = EHEA_BUSMAP_START;
    int top, dir, idx;

    for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
        struct ehea_top_bmap *ehea_top;
        int valid_dir_entries = 0;

        if (!ehea_bmap->top[top])
            continue;
        ehea_top = ehea_bmap->top[top];
        for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
            struct ehea_dir_bmap *ehea_dir;
            int valid_entries = 0;

            if (!ehea_top->dir[dir])
                continue;
            valid_dir_entries++;
            ehea_dir = ehea_top->dir[dir];
            for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
                if (!ehea_dir->ent[idx])
                    continue;
                valid_entries++;
                ehea_dir->ent[idx] = vaddr;
                vaddr += EHEA_SECTSIZE;
            }
            if (!valid_entries) {
                ehea_top->dir[dir] = NULL;
                kfree(ehea_dir);
            }
        }
        if (!valid_dir_entries) {
            ehea_bmap->top[top] = NULL;
            kfree(ehea_top);
        }
    }
}

static int ehea_update_busmap(unsigned long pfn, unsigned long nr_pages, int add)
{
    unsigned long i, start_section, end_section;

    if (!nr_pages)
        return 0;

    if (!ehea_bmap) {
        ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
        if (!ehea_bmap)
            return -ENOMEM;
    }

    start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
    end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
    /* Mark entries as valid or invalid only; address is assigned later */
    for (i = start_section; i < end_section; i++) {
        u64 flag;
        int top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
        int dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
        int idx = i & EHEA_INDEX_MASK;

        if (add) {
            int ret = ehea_init_bmap(ehea_bmap, top, dir);
            if (ret)
                return ret;
            flag = 1; /* valid */
            ehea_mr_len += EHEA_SECTSIZE;
        } else {
            if (!ehea_bmap->top[top])
                continue;
            if (!ehea_bmap->top[top]->dir[dir])
                continue;
            flag = 0; /* invalid */
            ehea_mr_len -= EHEA_SECTSIZE;
        }

        ehea_bmap->top[top]->dir[dir]->ent[idx] = flag;
    }
    ehea_rebuild_busmap(); /* Assign contiguous addresses for mr */
    return 0;
}

int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages)
{
    int ret;

    mutex_lock(&ehea_busmap_mutex);
    ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
    mutex_unlock(&ehea_busmap_mutex);
    return ret;
}

int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages)
{
    int ret;

    mutex_lock(&ehea_busmap_mutex);
    ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_REM_SECT);
    mutex_unlock(&ehea_busmap_mutex);
    return ret;
}

static int ehea_is_hugepage(unsigned long pfn)
{
    int page_order;

    if (pfn & EHEA_HUGEPAGE_PFN_MASK)
        return 0;

    page_order = compound_order(pfn_to_page(pfn));
    if (page_order + PAGE_SHIFT != EHEA_HUGEPAGESHIFT)
        return 0;

    return 1;
}

static int ehea_create_busmap_callback(unsigned long initial_pfn,
                       unsigned long total_nr_pages, void *arg)
{
    int ret;
    unsigned long pfn, start_pfn, end_pfn, nr_pages;

    if ((total_nr_pages * PAGE_SIZE) < EHEA_HUGEPAGE_SIZE)
        return ehea_update_busmap(initial_pfn, total_nr_pages,
                      EHEA_BUSMAP_ADD_SECT);

    /* Given chunk is >= 16GB -> check for hugepages */
    start_pfn = initial_pfn;
    end_pfn = initial_pfn + total_nr_pages;
    pfn = start_pfn;

    while (pfn < end_pfn) {
        if (ehea_is_hugepage(pfn)) {
            /* Add mem found in front of the hugepage */
            nr_pages = pfn - start_pfn;
            ret = ehea_update_busmap(start_pfn, nr_pages,
                         EHEA_BUSMAP_ADD_SECT);
            if (ret)
                return ret;

            /* Skip the hugepage */
            pfn += (EHEA_HUGEPAGE_SIZE / PAGE_SIZE);
            start_pfn = pfn;
        } else
            pfn += (EHEA_SECTSIZE / PAGE_SIZE);
    }

    /* Add mem found behind the hugepage(s)  */
    nr_pages = pfn - start_pfn;
    return ehea_update_busmap(start_pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
}

int ehea_create_busmap(void)
{
    int ret;

    mutex_lock(&ehea_busmap_mutex);
    ehea_mr_len = 0;
    ret = walk_system_ram_range(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
                   ehea_create_busmap_callback);
    mutex_unlock(&ehea_busmap_mutex);
    return ret;
}

void ehea_destroy_busmap(void)
{
    int top, dir;
    mutex_lock(&ehea_busmap_mutex);
    if (!ehea_bmap)
        goto out_destroy;

    for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
        if (!ehea_bmap->top[top])
            continue;

        for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
            if (!ehea_bmap->top[top]->dir[dir])
                continue;

            kfree(ehea_bmap->top[top]->dir[dir]);
        }

        kfree(ehea_bmap->top[top]);
    }

    kfree(ehea_bmap);
    ehea_bmap = NULL;
out_destroy:
    mutex_unlock(&ehea_busmap_mutex);
}

u64 ehea_map_vaddr(void *caddr)
{
    int top, dir, idx;
    unsigned long index, offset;

    if (!ehea_bmap)
        return EHEA_INVAL_ADDR;

    index = __pa(caddr) >> SECTION_SIZE_BITS;
    top = (index >> EHEA_TOP_INDEX_SHIFT) & EHEA_INDEX_MASK;
    if (!ehea_bmap->top[top])
        return EHEA_INVAL_ADDR;

    dir = (index >> EHEA_DIR_INDEX_SHIFT) & EHEA_INDEX_MASK;
    if (!ehea_bmap->top[top]->dir[dir])
        return EHEA_INVAL_ADDR;

    idx = index & EHEA_INDEX_MASK;
    if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
        return EHEA_INVAL_ADDR;

    offset = (unsigned long)caddr & (EHEA_SECTSIZE - 1);
    return ehea_bmap->top[top]->dir[dir]->ent[idx] | offset;
}

static inline void *ehea_calc_sectbase(int top, int dir, int idx)
{
    unsigned long ret = idx;
    ret |= dir << EHEA_DIR_INDEX_SHIFT;
    ret |= top << EHEA_TOP_INDEX_SHIFT;
    return __va(ret << SECTION_SIZE_BITS);
}

static u64 ehea_reg_mr_section(int top, int dir, int idx, u64 *pt,
                   struct ehea_adapter *adapter,
                   struct ehea_mr *mr)
{
    void *pg;
    u64 j, m, hret;
    unsigned long k = 0;
    u64 pt_abs = __pa(pt);

    void *sectbase = ehea_calc_sectbase(top, dir, idx);

    for (j = 0; j < (EHEA_PAGES_PER_SECTION / EHEA_MAX_RPAGE); j++) {

        for (m = 0; m < EHEA_MAX_RPAGE; m++) {
            pg = sectbase + ((k++) * EHEA_PAGESIZE);
            pt[m] = __pa(pg);
        }
        hret = ehea_h_register_rpage_mr(adapter->handle, mr->handle, 0,
                        0, pt_abs, EHEA_MAX_RPAGE);

        if ((hret != H_SUCCESS) &&
            (hret != H_PAGE_REGISTERED)) {
            ehea_h_free_resource(adapter->handle, mr->handle,
                         FORCE_FREE);
            pr_err("register_rpage_mr failed\n");
            return hret;
        }
    }
    return hret;
}

static u64 ehea_reg_mr_sections(int top, int dir, u64 *pt,
                struct ehea_adapter *adapter,
                struct ehea_mr *mr)
{
    u64 hret = H_SUCCESS;
    int idx;

    for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
        if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
            continue;

        hret = ehea_reg_mr_section(top, dir, idx, pt, adapter, mr);
        if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
            return hret;
    }
    return hret;
}

static u64 ehea_reg_mr_dir_sections(int top, u64 *pt,
                    struct ehea_adapter *adapter,
                    struct ehea_mr *mr)
{
    u64 hret = H_SUCCESS;
    int dir;

    for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
        if (!ehea_bmap->top[top]->dir[dir])
            continue;

        hret = ehea_reg_mr_sections(top, dir, pt, adapter, mr);
        if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
            return hret;
    }
    return hret;
}

int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
{
    int ret;
    u64 *pt;
    u64 hret;
    u32 acc_ctrl = EHEA_MR_ACC_CTRL;

    unsigned long top;

    pt = (void *)get_zeroed_page(GFP_KERNEL);
    if (!pt) {
        pr_err("no mem\n");
        ret = -ENOMEM;
        goto out;
    }

    hret = ehea_h_alloc_resource_mr(adapter->handle, EHEA_BUSMAP_START,
                    ehea_mr_len, acc_ctrl, adapter->pd,
                    &mr->handle, &mr->lkey);

    if (hret != H_SUCCESS) {
        pr_err("alloc_resource_mr failed\n");
        ret = -EIO;
        goto out;
    }

    if (!ehea_bmap) {
        ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
        pr_err("no busmap available\n");
        ret = -EIO;
        goto out;
    }

    for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
        if (!ehea_bmap->top[top])
            continue;

        hret = ehea_reg_mr_dir_sections(top, pt, adapter, mr);
        if((hret != H_PAGE_REGISTERED) && (hret != H_SUCCESS))
            break;
    }

    if (hret != H_SUCCESS) {
        ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
        pr_err("registering mr failed\n");
        ret = -EIO;
        goto out;
    }

    mr->vaddr = EHEA_BUSMAP_START;
    mr->adapter = adapter;
    ret = 0;
out:
    free_page((unsigned long)pt);
    return ret;
}

int ehea_rem_mr(struct ehea_mr *mr)
{
    u64 hret;

    if (!mr || !mr->adapter)
        return -EINVAL;

    hret = ehea_h_free_resource(mr->adapter->handle, mr->handle,
                    FORCE_FREE);
    if (hret != H_SUCCESS) {
        pr_err("destroy MR failed\n");
        return -EIO;
    }

    return 0;
}

int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
         struct ehea_mr *shared_mr)
{
    u64 hret;

    hret = ehea_h_register_smr(adapter->handle, old_mr->handle,
                   old_mr->vaddr, EHEA_MR_ACC_CTRL,
                   adapter->pd, shared_mr);
    if (hret != H_SUCCESS)
        return -EIO;

    shared_mr->adapter = adapter;

    return 0;
}

static void print_error_data(u64 *data)
{
    int length;
    u64 type = EHEA_BMASK_GET(ERROR_DATA_TYPE, data[2]);
    u64 resource = data[1];

    length = EHEA_BMASK_GET(ERROR_DATA_LENGTH, data[0]);

    if (length > EHEA_PAGESIZE)
        length = EHEA_PAGESIZE;

    if (type == EHEA_AER_RESTYPE_QP)
        pr_err("QP (resource=%llX) state: AER=0x%llX, AERR=0x%llX, port=%llX\n",
               resource, data[6], data[12], data[22]);
    else if (type == EHEA_AER_RESTYPE_CQ)
        pr_err("CQ (resource=%llX) state: AER=0x%llX\n",
               resource, data[6]);
    else if (type == EHEA_AER_RESTYPE_EQ)
        pr_err("EQ (resource=%llX) state: AER=0x%llX\n",
               resource, data[6]);

    ehea_dump(data, length, "error data");
}

u64 ehea_error_data(struct ehea_adapter *adapter, u64 res_handle,
            u64 *aer, u64 *aerr)
{
    unsigned long ret;
    u64 *rblock;
    u64 type = 0;

    rblock = (void *)get_zeroed_page(GFP_KERNEL);
    if (!rblock) {
        pr_err("Cannot allocate rblock memory\n");
        goto out;
    }

    ret = ehea_h_error_data(adapter->handle, res_handle, rblock);

    if (ret == H_SUCCESS) {
        type = EHEA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
        *aer = rblock[6];
        *aerr = rblock[12];
        print_error_data(rblock);
    } else if (ret == H_R_STATE) {
        pr_err("No error data available: %llX\n", res_handle);
    } else
        pr_err("Error data could not be fetched: %llX\n", res_handle);

    free_page((unsigned long)rblock);
out:
    return type;
}