Merge branch 'next' into for-linus

1 files changed, 1031 insertions, 0 deletions

diff --git a/drivers/net/ethernet/ibm/ehea/ehea_qmr.c b/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
new file mode 100644
index 000000000000..95b9f4fa811e
--- /dev/null
+++ b/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
@@ -0,0 +1,1031 @@
+/*
+ *  linux/drivers/net/ehea/ehea_qmr.c
+ *
+ *  eHEA ethernet device driver for IBM eServer System p
+ *
+ *  (C) Copyright IBM Corp. 2006
+ *
+ *  Authors:
+ *       Christoph Raisch <raisch@de.ibm.com>
+ *       Jan-Bernd Themann <themann@de.ibm.com>
+ *       Thomas Klein <tklein@de.ibm.com>
+ *
+ *
+ * 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"
+
+struct ehea_bmap *ehea_bmap = NULL;
+
+
+
+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 = virt_to_abs(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;
+}
+
+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 = virt_to_abs(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;
+}
+
+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
+ */
+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 = virt_to_abs(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;
+}
+
+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 = virt_to_abs(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 abs_to_virt(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 = virt_to_abs(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] = virt_to_abs(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;
+}
+
+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;
+}