IB/usnic: Add Cisco VIC low-level hardware driver

This adds a driver that allows userspace to use UD-like QPs over a
proprietary Cisco transport with Cisco's Virtual Interface Cards (VICs),
including VIC 1240 and 1280 cards.

Signed-off-by: Upinder Malhi <umalhi@cisco.com>
Signed-off-by: Christian Benvenuti <benve@cisco.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 80 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.h b/drivers/infiniband/hw/usnic/usnic_uiom.h
new file mode 100644
index 000000000000..70440996e8f2
--- /dev/null
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ *
+ */
+
+#ifndef USNIC_UIOM_H_
+#define USNIC_UIOM_H_
+
+#include <linux/list.h>
+#include <linux/scatterlist.h>
+
+#include "usnic_uiom_interval_tree.h"
+
+#define USNIC_UIOM_READ			(1)
+#define USNIC_UIOM_WRITE		(2)
+
+#define USNIC_UIOM_MAX_PD_CNT		(1000)
+#define USNIC_UIOM_MAX_MR_CNT		(1000000)
+#define USNIC_UIOM_MAX_MR_SIZE		(~0UL)
+#define USNIC_UIOM_PAGE_SIZE		(PAGE_SIZE)
+
+struct usnic_uiom_dev {
+	struct device			*dev;
+	struct list_head		link;
+};
+
+struct usnic_uiom_pd {
+	struct iommu_domain		*domain;
+	spinlock_t			lock;
+	struct rb_root			rb_root;
+	struct list_head		devs;
+	int				dev_cnt;
+};
+
+struct usnic_uiom_reg {
+	struct usnic_uiom_pd		*pd;
+	unsigned long			va;
+	size_t				length;
+	int				offset;
+	int				page_size;
+	int				writable;
+	struct list_head		chunk_list;
+	struct work_struct		work;
+	struct mm_struct		*mm;
+	unsigned long			diff;
+};
+
+struct usnic_uiom_chunk {
+	struct list_head		list;
+	int				nents;
+	struct scatterlist		page_list[0];
+};
+
+struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
+void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
+int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
+void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
+					struct device *dev);
+struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
+void usnic_uiom_free_dev_list(struct device **devs);
+struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
+						unsigned long addr, size_t size,
+						int access, int dmasync);
+void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing);
+int usnic_uiom_init(char *drv_name);
+void usnic_uiom_fini(void);
+#endif /* USNIC_UIOM_H_ */