1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/staging/hv/blkvsc.c b/drivers/staging/hv/blkvsc.c
new file mode 100644
index 000000000000..0daebc472e63
--- /dev/null
+++ b/drivers/staging/hv/blkvsc.c
@@ -0,0 +1,112 @@
+/*
+ *
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include "osd.h"
+#include "storvsc.c"
+
+static const char *gBlkDriverName = "blkvsc";
+
+/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
+static const struct hv_guid gBlkVscDeviceType = {
+	.data = {
+		0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
+		0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
+	}
+};
+
+static int BlkVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo)
+{
+	struct storvsc_device_info *deviceInfo;
+	int ret = 0;
+
+	DPRINT_ENTER(BLKVSC);
+
+	deviceInfo = (struct storvsc_device_info *)AdditionalInfo;
+
+	ret = StorVscOnDeviceAdd(Device, AdditionalInfo);
+	if (ret != 0) {
+		DPRINT_EXIT(BLKVSC);
+		return ret;
+	}
+
+	/*
+	 * We need to use the device instance guid to set the path and target
+	 * id. For IDE devices, the device instance id is formatted as
+	 * <bus id> * - <device id> - 8899 - 000000000000.
+	 */
+	deviceInfo->PathId = Device->deviceInstance.data[3] << 24 |
+			     Device->deviceInstance.data[2] << 16 |
+			     Device->deviceInstance.data[1] << 8  |
+			     Device->deviceInstance.data[0];
+
+	deviceInfo->TargetId = Device->deviceInstance.data[5] << 8 |
+			       Device->deviceInstance.data[4];
+
+	DPRINT_EXIT(BLKVSC);
+
+	return ret;
+}
+
+int BlkVscInitialize(struct hv_driver *Driver)
+{
+	struct storvsc_driver_object *storDriver;
+	int ret = 0;
+
+	DPRINT_ENTER(BLKVSC);
+
+	storDriver = (struct storvsc_driver_object *)Driver;
+
+	/* Make sure we are at least 2 pages since 1 page is used for control */
+	/* ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1)); */
+
+	Driver->name = gBlkDriverName;
+	memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(struct hv_guid));
+
+	storDriver->RequestExtSize = sizeof(struct storvsc_request_extension);
+
+	/*
+	 * Divide the ring buffer data size (which is 1 page less than the ring
+	 * buffer size since that page is reserved for the ring buffer indices)
+	 * by the max request size (which is
+	 * VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + struct vstor_packet + u64)
+	 */
+	storDriver->MaxOutstandingRequestsPerChannel =
+		((storDriver->RingBufferSize - PAGE_SIZE) /
+		  ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET +
+			   sizeof(struct vstor_packet) + sizeof(u64),
+			   sizeof(u64)));
+
+	DPRINT_INFO(BLKVSC, "max io outstd %u",
+		    storDriver->MaxOutstandingRequestsPerChannel);
+
+	/* Setup the dispatch table */
+	storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd;
+	storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove;
+	storDriver->Base.OnCleanup = StorVscOnCleanup;
+	storDriver->OnIORequest	= StorVscOnIORequest;
+
+	DPRINT_EXIT(BLKVSC);
+
+	return ret;
+}