IB/ipath: misc infiniband code, part 1

Completion queues, local and remote memory keys, and memory region
support.

Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 383 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_mr.c b/drivers/infiniband/hw/ipath/ipath_mr.c
new file mode 100644
index 000000000000..69ffec66d45d
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_mr.c
@@ -0,0 +1,383 @@
+/*
+ * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <rdma/ib_pack.h>
+#include <rdma/ib_smi.h>
+
+#include "ipath_verbs.h"
+
+/**
+ * ipath_get_dma_mr - get a DMA memory region
+ * @pd: protection domain for this memory region
+ * @acc: access flags
+ *
+ * Returns the memory region on success, otherwise returns an errno.
+ */
+struct ib_mr *ipath_get_dma_mr(struct ib_pd *pd, int acc)
+{
+        struct ipath_mr *mr;
+        struct ib_mr *ret;
+
+        mr = kzalloc(sizeof *mr, GFP_KERNEL);
+        if (!mr) {
+                ret = ERR_PTR(-ENOMEM);
+                goto bail;
+        }
+
+        mr->mr.access_flags = acc;
+        ret = &mr->ibmr;
+
+bail:
+        return ret;
+}
+
+static struct ipath_mr *alloc_mr(int count,
+                                 struct ipath_lkey_table *lk_table)
+{
+        struct ipath_mr *mr;
+        int m, i = 0;
+
+        /* Allocate struct plus pointers to first level page tables. */
+        m = (count + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
+        mr = kmalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL);
+        if (!mr)
+                goto done;
+
+        /* Allocate first level page tables. */
+        for (; i < m; i++) {
+                mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
+                if (!mr->mr.map[i])
+                        goto bail;
+        }
+        mr->mr.mapsz = m;
+
+        /*
+         * ib_reg_phys_mr() will initialize mr->ibmr except for
+         * lkey and rkey.
+         */
+        if (!ipath_alloc_lkey(lk_table, &mr->mr))
+                goto bail;
+        mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;
+
+        goto done;
+
+bail:
+        while (i) {
+                i--;
+                kfree(mr->mr.map[i]);
+        }
+        kfree(mr);
+        mr = NULL;
+
+done:
+        return mr;
+}
+
+/**
+ * ipath_reg_phys_mr - register a physical memory region
+ * @pd: protection domain for this memory region
+ * @buffer_list: pointer to the list of physical buffers to register
+ * @num_phys_buf: the number of physical buffers to register
+ * @iova_start: the starting address passed over IB which maps to this MR
+ *
+ * Returns the memory region on success, otherwise returns an errno.
+ */
+struct ib_mr *ipath_reg_phys_mr(struct ib_pd *pd,
+                                struct ib_phys_buf *buffer_list,
+                                int num_phys_buf, int acc, u64 *iova_start)
+{
+        struct ipath_mr *mr;
+        int n, m, i;
+        struct ib_mr *ret;
+
+        mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table);
+        if (mr == NULL) {
+                ret = ERR_PTR(-ENOMEM);
+                goto bail;
+        }
+
+        mr->mr.user_base = *iova_start;
+        mr->mr.iova = *iova_start;
+        mr->mr.length = 0;
+        mr->mr.offset = 0;
+        mr->mr.access_flags = acc;
+        mr->mr.max_segs = num_phys_buf;
+
+        m = 0;
+        n = 0;
+        for (i = 0; i < num_phys_buf; i++) {
+                mr->mr.map[m]->segs[n].vaddr =
+                        phys_to_virt(buffer_list[i].addr);
+                mr->mr.map[m]->segs[n].length = buffer_list[i].size;
+                mr->mr.length += buffer_list[i].size;
+                n++;
+                if (n == IPATH_SEGSZ) {
+                        m++;
+                        n = 0;
+                }
+        }
+
+        ret = &mr->ibmr;
+
+bail:
+        return ret;
+}
+
+/**
+ * ipath_reg_user_mr - register a userspace memory region
+ * @pd: protection domain for this memory region
+ * @region: the user memory region
+ * @mr_access_flags: access flags for this memory region
+ * @udata: unused by the InfiniPath driver
+ *
+ * Returns the memory region on success, otherwise returns an errno.
+ */
+struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
+                                int mr_access_flags, struct ib_udata *udata)
+{
+        struct ipath_mr *mr;
+        struct ib_umem_chunk *chunk;
+        int n, m, i;
+        struct ib_mr *ret;
+
+        n = 0;
+        list_for_each_entry(chunk, &region->chunk_list, list)
+                n += chunk->nents;
+
+        mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
+        if (!mr) {
+                ret = ERR_PTR(-ENOMEM);
+                goto bail;
+        }
+
+        mr->mr.user_base = region->user_base;
+        mr->mr.iova = region->virt_base;
+        mr->mr.length = region->length;
+        mr->mr.offset = region->offset;
+        mr->mr.access_flags = mr_access_flags;
+        mr->mr.max_segs = n;
+
+        m = 0;
+        n = 0;
+        list_for_each_entry(chunk, &region->chunk_list, list) {
+                for (i = 0; i < chunk->nmap; i++) {
+                        mr->mr.map[m]->segs[n].vaddr =
+                                page_address(chunk->page_list[i].page);
+                        mr->mr.map[m]->segs[n].length = region->page_size;
+                        n++;
+                        if (n == IPATH_SEGSZ) {
+                                m++;
+                                n = 0;
+                        }
+                }
+        }
+        ret = &mr->ibmr;
+
+bail:
+        return ret;
+}
+
+/**
+ * ipath_dereg_mr - unregister and free a memory region
+ * @ibmr: the memory region to free
+ *
+ * Returns 0 on success.
+ *
+ * Note that this is called to free MRs created by ipath_get_dma_mr()
+ * or ipath_reg_user_mr().
+ */
+int ipath_dereg_mr(struct ib_mr *ibmr)
+{
+        struct ipath_mr *mr = to_imr(ibmr);
+        int i;
+
+        ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
+        i = mr->mr.mapsz;
+        while (i) {
+                i--;
+                kfree(mr->mr.map[i]);
+        }
+        kfree(mr);
+        return 0;
+}
+
+/**
+ * ipath_alloc_fmr - allocate a fast memory region
+ * @pd: the protection domain for this memory region
+ * @mr_access_flags: access flags for this memory region
+ * @fmr_attr: fast memory region attributes
+ *
+ * Returns the memory region on success, otherwise returns an errno.
+ */
+struct ib_fmr *ipath_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
+                               struct ib_fmr_attr *fmr_attr)
+{
+        struct ipath_fmr *fmr;
+        int m, i = 0;
+        struct ib_fmr *ret;
+
+        /* Allocate struct plus pointers to first level page tables. */
+        m = (fmr_attr->max_pages + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
+        fmr = kmalloc(sizeof *fmr + m * sizeof fmr->mr.map[0], GFP_KERNEL);
+        if (!fmr)
+                goto bail;
+
+        /* Allocate first level page tables. */
+        for (; i < m; i++) {
+                fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
+                                         GFP_KERNEL);
+                if (!fmr->mr.map[i])
+                        goto bail;
+        }
+        fmr->mr.mapsz = m;
+
+        /*
+         * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
+         * rkey.
+         */
+        if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
+                goto bail;
+        fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
+        /*
+         * Resources are allocated but no valid mapping (RKEY can't be
+         * used).
+         */
+        fmr->mr.user_base = 0;
+        fmr->mr.iova = 0;
+        fmr->mr.length = 0;
+        fmr->mr.offset = 0;
+        fmr->mr.access_flags = mr_access_flags;
+        fmr->mr.max_segs = fmr_attr->max_pages;
+        fmr->page_shift = fmr_attr->page_shift;
+
+        ret = &fmr->ibfmr;
+        goto done;
+
+bail:
+        while (i)
+                kfree(fmr->mr.map[--i]);
+        kfree(fmr);
+        ret = ERR_PTR(-ENOMEM);
+
+done:
+        return ret;
+}
+
+/**
+ * ipath_map_phys_fmr - set up a fast memory region
+ * @ibmfr: the fast memory region to set up
+ * @page_list: the list of pages to associate with the fast memory region
+ * @list_len: the number of pages to associate with the fast memory region
+ * @iova: the virtual address of the start of the fast memory region
+ *
+ * This may be called from interrupt context.
+ */
+
+int ipath_map_phys_fmr(struct ib_fmr *ibfmr, u64 * page_list,
+                       int list_len, u64 iova)
+{
+        struct ipath_fmr *fmr = to_ifmr(ibfmr);
+        struct ipath_lkey_table *rkt;
+        unsigned long flags;
+        int m, n, i;
+        u32 ps;
+        int ret;
+
+        if (list_len > fmr->mr.max_segs) {
+                ret = -EINVAL;
+                goto bail;
+        }
+        rkt = &to_idev(ibfmr->device)->lk_table;
+        spin_lock_irqsave(&rkt->lock, flags);
+        fmr->mr.user_base = iova;
+        fmr->mr.iova = iova;
+        ps = 1 << fmr->page_shift;
+        fmr->mr.length = list_len * ps;
+        m = 0;
+        n = 0;
+        ps = 1 << fmr->page_shift;
+        for (i = 0; i < list_len; i++) {
+                fmr->mr.map[m]->segs[n].vaddr = phys_to_virt(page_list[i]);
+                fmr->mr.map[m]->segs[n].length = ps;
+                if (++n == IPATH_SEGSZ) {
+                        m++;
+                        n = 0;
+                }
+        }
+        spin_unlock_irqrestore(&rkt->lock, flags);
+        ret = 0;
+
+bail:
+        return ret;
+}
+
+/**
+ * ipath_unmap_fmr - unmap fast memory regions
+ * @fmr_list: the list of fast memory regions to unmap
+ *
+ * Returns 0 on success.
+ */
+int ipath_unmap_fmr(struct list_head *fmr_list)
+{
+        struct ipath_fmr *fmr;
+        struct ipath_lkey_table *rkt;
+        unsigned long flags;
+
+        list_for_each_entry(fmr, fmr_list, ibfmr.list) {
+                rkt = &to_idev(fmr->ibfmr.device)->lk_table;
+                spin_lock_irqsave(&rkt->lock, flags);
+                fmr->mr.user_base = 0;
+                fmr->mr.iova = 0;
+                fmr->mr.length = 0;
+                spin_unlock_irqrestore(&rkt->lock, flags);
+        }
+        return 0;
+}
+
+/**
+ * ipath_dealloc_fmr - deallocate a fast memory region
+ * @ibfmr: the fast memory region to deallocate
+ *
+ * Returns 0 on success.
+ */
+int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
+{
+        struct ipath_fmr *fmr = to_ifmr(ibfmr);
+        int i;
+
+        ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
+        i = fmr->mr.mapsz;
+        while (i)
+                kfree(fmr->mr.map[--i]);
+        kfree(fmr);
+        return 0;
+}