1 files changed, 999 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 000000000..db45373ea
--- /dev/null
+++ b/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
@@ -0,0 +1,999 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  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 <raisch@de.ibm.com>
+ *       Jan-Bernd Themann <themann@de.ibm.com>
+ *       Thomas Klein <tklein@de.ibm.com>
+ */
+
+#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_array(nr_of_pages, sizeof(void *),
+					   GFP_KERNEL);
+	if (!queue->queue_pages)
+		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;
+	int i, nr_pages;
+
+	if (!queue || !queue->queue_pages)
+		return;
+
+	pages_per_kpage = PAGE_SIZE / queue->pagesize;
+
+	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;
+	u64 hret, rpage;
+	u32 counter;
+	int ret;
+	void *vpage;
+
+	cq = kzalloc(sizeof(*cq), GFP_KERNEL);
+	if (!cq)
+		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;
+
+	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);
+	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)
+		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)
+		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)
+{
+	if (pfn & EHEA_HUGEPAGE_PFN_MASK)
+		return 0;
+
+	if (page_shift(pfn_to_page(pfn)) != 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;
+}