1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_mmap.c b/drivers/infiniband/hw/ipath/ipath_mmap.c
new file mode 100644
index 000000000000..11b7378ff214
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_mmap.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2006 QLogic, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <asm/pgtable.h>
+
+#include "ipath_verbs.h"
+
+/**
+ * ipath_release_mmap_info - free mmap info structure
+ * @ref: a pointer to the kref within struct ipath_mmap_info
+ */
+void ipath_release_mmap_info(struct kref *ref)
+{
+	struct ipath_mmap_info *ip =
+		container_of(ref, struct ipath_mmap_info, ref);
+
+	vfree(ip->obj);
+	kfree(ip);
+}
+
+/*
+ * open and close keep track of how many times the CQ is mapped,
+ * to avoid releasing it.
+ */
+static void ipath_vma_open(struct vm_area_struct *vma)
+{
+	struct ipath_mmap_info *ip = vma->vm_private_data;
+
+	kref_get(&ip->ref);
+	ip->mmap_cnt++;
+}
+
+static void ipath_vma_close(struct vm_area_struct *vma)
+{
+	struct ipath_mmap_info *ip = vma->vm_private_data;
+
+	ip->mmap_cnt--;
+	kref_put(&ip->ref, ipath_release_mmap_info);
+}
+
+static struct vm_operations_struct ipath_vm_ops = {
+	.open =     ipath_vma_open,
+	.close =    ipath_vma_close,
+};
+
+/**
+ * ipath_mmap - create a new mmap region
+ * @context: the IB user context of the process making the mmap() call
+ * @vma: the VMA to be initialized
+ * Return zero if the mmap is OK. Otherwise, return an errno.
+ */
+int ipath_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
+{
+	struct ipath_ibdev *dev = to_idev(context->device);
+	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+	unsigned long size = vma->vm_end - vma->vm_start;
+	struct ipath_mmap_info *ip, **pp;
+	int ret = -EINVAL;
+
+	/*
+	 * Search the device's list of objects waiting for a mmap call.
+	 * Normally, this list is very short since a call to create a
+	 * CQ, QP, or SRQ is soon followed by a call to mmap().
+	 */
+	spin_lock_irq(&dev->pending_lock);
+	for (pp = &dev->pending_mmaps; (ip = *pp); pp = &ip->next) {
+		/* Only the creator is allowed to mmap the object */
+		if (context != ip->context || (void *) offset != ip->obj)
+			continue;
+		/* Don't allow a mmap larger than the object. */
+		if (size > ip->size)
+			break;
+
+		*pp = ip->next;
+		spin_unlock_irq(&dev->pending_lock);
+
+		ret = remap_vmalloc_range(vma, ip->obj, 0);
+		if (ret)
+			goto done;
+		vma->vm_ops = &ipath_vm_ops;
+		vma->vm_private_data = ip;
+		ipath_vma_open(vma);
+		goto done;
+	}
+	spin_unlock_irq(&dev->pending_lock);
+done:
+	return ret;
+}