3216 lines
83 KiB
Diff
3216 lines
83 KiB
Diff
From: "K. Y. Srinivasan" <kys@microsoft.com>
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Date: Thu, 9 Feb 2012 14:14:48 -0800
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Subject: [PATCH 67/77] Staging: hv: storvsc: Move the storage driver out of
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the staging area
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commit 89ae7d709357df3a60e81c57613859d91d093ace upstream.
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The storage driver (storvsc_drv.c) handles all block storage devices
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assigned to Linux guests hosted on Hyper-V. This driver has been in the
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staging tree for a while and this patch moves it out of the staging area.
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James was willing to apply this patch during the 3.3-rc phase and a decision
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was taken to defer this to 3.4 since Greg had queued up a bunch of storvsc
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patches for 3.4. Now that Greg has applied all of the pending storvsc patches,
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I am sending this patch to move this driver out of staging. Based on James'
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recommendation, this patch gets rid of the unneeded files in the staging/hv
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directory.
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Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
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Acked-by: James Bottomley <JBottomley@Parallels.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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[bwh: Adjusted to apply after commit 5c1b10ab7f93d24f29b5630286e323d1c5802d5c
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('storvsc: Account for in-transit packets in the RESET path') backported
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in 3.2.33, moving that fix to the new file]
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---
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--- a/drivers/scsi/Kconfig
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+++ b/drivers/scsi/Kconfig
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@@ -663,6 +663,13 @@ config VMWARE_PVSCSI
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To compile this driver as a module, choose M here: the
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module will be called vmw_pvscsi.
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+config HYPERV_STORAGE
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+ tristate "Microsoft Hyper-V virtual storage driver"
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+ depends on SCSI && HYPERV
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+ default HYPERV
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+ help
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+ Select this option to enable the Hyper-V virtual storage driver.
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+
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config LIBFC
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tristate "LibFC module"
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select SCSI_FC_ATTRS
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--- a/drivers/scsi/Makefile
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+++ b/drivers/scsi/Makefile
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@@ -142,6 +142,7 @@ obj-$(CONFIG_SCSI_BNX2_ISCSI) += libiscs
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obj-$(CONFIG_BE2ISCSI) += libiscsi.o be2iscsi/
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obj-$(CONFIG_SCSI_PMCRAID) += pmcraid.o
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obj-$(CONFIG_VMWARE_PVSCSI) += vmw_pvscsi.o
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+obj-$(CONFIG_HYPERV_STORAGE) += hv_storvsc.o
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obj-$(CONFIG_ARM) += arm/
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@@ -170,6 +171,8 @@ scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_
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scsi_mod-y += scsi_trace.o
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scsi_mod-$(CONFIG_PM) += scsi_pm.o
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+hv_storvsc-y := storvsc_drv.o
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+
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scsi_tgt-y += scsi_tgt_lib.o scsi_tgt_if.o
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sd_mod-objs := sd.o
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--- /dev/null
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+++ b/drivers/scsi/storvsc_drv.c
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@@ -0,0 +1,1553 @@
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+/*
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+ * Copyright (c) 2009, Microsoft Corporation.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along with
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+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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+ * Place - Suite 330, Boston, MA 02111-1307 USA.
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+ *
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+ * Authors:
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+ * Haiyang Zhang <haiyangz@microsoft.com>
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+ * Hank Janssen <hjanssen@microsoft.com>
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+ * K. Y. Srinivasan <kys@microsoft.com>
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/wait.h>
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+#include <linux/sched.h>
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+#include <linux/completion.h>
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+#include <linux/string.h>
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+#include <linux/mm.h>
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+#include <linux/delay.h>
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+#include <linux/init.h>
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+#include <linux/slab.h>
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+#include <linux/module.h>
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+#include <linux/device.h>
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+#include <linux/hyperv.h>
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+#include <linux/mempool.h>
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+#include <scsi/scsi.h>
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+#include <scsi/scsi_cmnd.h>
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+#include <scsi/scsi_host.h>
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+#include <scsi/scsi_device.h>
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+#include <scsi/scsi_tcq.h>
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+#include <scsi/scsi_eh.h>
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+#include <scsi/scsi_devinfo.h>
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+#include <scsi/scsi_dbg.h>
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+
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+/*
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+ * All wire protocol details (storage protocol between the guest and the host)
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+ * are consolidated here.
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+ *
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+ * Begin protocol definitions.
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+ */
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+
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+/*
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+ * Version history:
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+ * V1 Beta: 0.1
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+ * V1 RC < 2008/1/31: 1.0
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+ * V1 RC > 2008/1/31: 2.0
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+ * Win7: 4.2
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+ */
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+
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+#define VMSTOR_CURRENT_MAJOR 4
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+#define VMSTOR_CURRENT_MINOR 2
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+
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+
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+/* Packet structure describing virtual storage requests. */
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+enum vstor_packet_operation {
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+ VSTOR_OPERATION_COMPLETE_IO = 1,
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+ VSTOR_OPERATION_REMOVE_DEVICE = 2,
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+ VSTOR_OPERATION_EXECUTE_SRB = 3,
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+ VSTOR_OPERATION_RESET_LUN = 4,
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+ VSTOR_OPERATION_RESET_ADAPTER = 5,
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+ VSTOR_OPERATION_RESET_BUS = 6,
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+ VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
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+ VSTOR_OPERATION_END_INITIALIZATION = 8,
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+ VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
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+ VSTOR_OPERATION_QUERY_PROPERTIES = 10,
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+ VSTOR_OPERATION_ENUMERATE_BUS = 11,
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+ VSTOR_OPERATION_MAXIMUM = 11
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+};
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+
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+/*
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+ * Platform neutral description of a scsi request -
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+ * this remains the same across the write regardless of 32/64 bit
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+ * note: it's patterned off the SCSI_PASS_THROUGH structure
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+ */
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+#define STORVSC_MAX_CMD_LEN 0x10
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+#define STORVSC_SENSE_BUFFER_SIZE 0x12
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+#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
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+
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+struct vmscsi_request {
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+ u16 length;
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+ u8 srb_status;
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+ u8 scsi_status;
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+
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+ u8 port_number;
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+ u8 path_id;
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+ u8 target_id;
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+ u8 lun;
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+
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+ u8 cdb_length;
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+ u8 sense_info_length;
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+ u8 data_in;
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+ u8 reserved;
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+
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+ u32 data_transfer_length;
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+
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+ union {
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+ u8 cdb[STORVSC_MAX_CMD_LEN];
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+ u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
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+ u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
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+ };
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+} __attribute((packed));
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+
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+
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+/*
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+ * This structure is sent during the intialization phase to get the different
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+ * properties of the channel.
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+ */
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+struct vmstorage_channel_properties {
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+ u16 protocol_version;
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+ u8 path_id;
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+ u8 target_id;
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+
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+ /* Note: port number is only really known on the client side */
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+ u32 port_number;
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+ u32 flags;
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+ u32 max_transfer_bytes;
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+
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+ /*
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+ * This id is unique for each channel and will correspond with
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+ * vendor specific data in the inquiry data.
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+ */
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+
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+ u64 unique_id;
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+} __packed;
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+
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+/* This structure is sent during the storage protocol negotiations. */
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+struct vmstorage_protocol_version {
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+ /* Major (MSW) and minor (LSW) version numbers. */
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+ u16 major_minor;
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+
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+ /*
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+ * Revision number is auto-incremented whenever this file is changed
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+ * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
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+ * definitely indicate incompatibility--but it does indicate mismatched
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+ * builds.
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+ * This is only used on the windows side. Just set it to 0.
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+ */
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+ u16 revision;
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+} __packed;
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+
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+/* Channel Property Flags */
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+#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
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+#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
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+
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+struct vstor_packet {
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+ /* Requested operation type */
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+ enum vstor_packet_operation operation;
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+
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+ /* Flags - see below for values */
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+ u32 flags;
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+
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+ /* Status of the request returned from the server side. */
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+ u32 status;
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+
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+ /* Data payload area */
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+ union {
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+ /*
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+ * Structure used to forward SCSI commands from the
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+ * client to the server.
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+ */
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+ struct vmscsi_request vm_srb;
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+
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+ /* Structure used to query channel properties. */
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+ struct vmstorage_channel_properties storage_channel_properties;
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+
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+ /* Used during version negotiations. */
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+ struct vmstorage_protocol_version version;
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+ };
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+} __packed;
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+
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+/*
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+ * Packet Flags:
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+ *
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+ * This flag indicates that the server should send back a completion for this
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+ * packet.
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+ */
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+
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+#define REQUEST_COMPLETION_FLAG 0x1
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+
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+/* Matches Windows-end */
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+enum storvsc_request_type {
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+ WRITE_TYPE = 0,
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+ READ_TYPE,
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+ UNKNOWN_TYPE,
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+};
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+
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+/*
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+ * SRB status codes and masks; a subset of the codes used here.
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+ */
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+
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+#define SRB_STATUS_AUTOSENSE_VALID 0x80
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+#define SRB_STATUS_INVALID_LUN 0x20
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+#define SRB_STATUS_SUCCESS 0x01
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+#define SRB_STATUS_ERROR 0x04
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+
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+/*
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+ * This is the end of Protocol specific defines.
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+ */
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+
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+
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+/*
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+ * We setup a mempool to allocate request structures for this driver
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+ * on a per-lun basis. The following define specifies the number of
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+ * elements in the pool.
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+ */
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+
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+#define STORVSC_MIN_BUF_NR 64
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+static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
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+
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+module_param(storvsc_ringbuffer_size, int, S_IRUGO);
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+MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
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+
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+#define STORVSC_MAX_IO_REQUESTS 128
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+
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+/*
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+ * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
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+ * reality, the path/target is not used (ie always set to 0) so our
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+ * scsi host adapter essentially has 1 bus with 1 target that contains
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+ * up to 256 luns.
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+ */
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+#define STORVSC_MAX_LUNS_PER_TARGET 64
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+#define STORVSC_MAX_TARGETS 1
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+#define STORVSC_MAX_CHANNELS 1
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+
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+
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+
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+struct storvsc_cmd_request {
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+ struct list_head entry;
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+ struct scsi_cmnd *cmd;
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+
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+ unsigned int bounce_sgl_count;
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+ struct scatterlist *bounce_sgl;
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+
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+ struct hv_device *device;
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+
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+ /* Synchronize the request/response if needed */
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+ struct completion wait_event;
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+
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+ unsigned char *sense_buffer;
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+ struct hv_multipage_buffer data_buffer;
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+ struct vstor_packet vstor_packet;
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+};
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+
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+
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+/* A storvsc device is a device object that contains a vmbus channel */
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+struct storvsc_device {
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+ struct hv_device *device;
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+
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+ bool destroy;
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+ bool drain_notify;
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+ atomic_t num_outstanding_req;
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+ struct Scsi_Host *host;
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+
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+ wait_queue_head_t waiting_to_drain;
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+
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+ /*
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+ * Each unique Port/Path/Target represents 1 channel ie scsi
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+ * controller. In reality, the pathid, targetid is always 0
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+ * and the port is set by us
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+ */
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+ unsigned int port_number;
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+ unsigned char path_id;
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+ unsigned char target_id;
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+
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+ /* Used for vsc/vsp channel reset process */
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+ struct storvsc_cmd_request init_request;
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+ struct storvsc_cmd_request reset_request;
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+};
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+
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+struct stor_mem_pools {
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+ struct kmem_cache *request_pool;
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+ mempool_t *request_mempool;
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+};
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+
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+struct hv_host_device {
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+ struct hv_device *dev;
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+ unsigned int port;
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+ unsigned char path;
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+ unsigned char target;
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+};
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+
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+struct storvsc_scan_work {
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+ struct work_struct work;
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+ struct Scsi_Host *host;
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+ uint lun;
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+};
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+
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+static void storvsc_bus_scan(struct work_struct *work)
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+{
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+ struct storvsc_scan_work *wrk;
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+ int id, order_id;
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+
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+ wrk = container_of(work, struct storvsc_scan_work, work);
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+ for (id = 0; id < wrk->host->max_id; ++id) {
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+ if (wrk->host->reverse_ordering)
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+ order_id = wrk->host->max_id - id - 1;
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+ else
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+ order_id = id;
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+
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+ scsi_scan_target(&wrk->host->shost_gendev, 0,
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+ order_id, SCAN_WILD_CARD, 1);
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+ }
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+ kfree(wrk);
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+}
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+
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+static void storvsc_remove_lun(struct work_struct *work)
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+{
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+ struct storvsc_scan_work *wrk;
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+ struct scsi_device *sdev;
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+
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+ wrk = container_of(work, struct storvsc_scan_work, work);
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+ if (!scsi_host_get(wrk->host))
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+ goto done;
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+
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+ sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
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+
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+ if (sdev) {
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+ scsi_remove_device(sdev);
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+ scsi_device_put(sdev);
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+ }
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+ scsi_host_put(wrk->host);
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+
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+done:
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+ kfree(wrk);
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+}
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+
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+/*
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+ * Major/minor macros. Minor version is in LSB, meaning that earlier flat
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+ * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
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+ */
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+
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+static inline u16 storvsc_get_version(u8 major, u8 minor)
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+{
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+ u16 version;
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+
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+ version = ((major << 8) | minor);
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+ return version;
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+}
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+
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+/*
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+ * We can get incoming messages from the host that are not in response to
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+ * messages that we have sent out. An example of this would be messages
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+ * received by the guest to notify dynamic addition/removal of LUNs. To
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+ * deal with potential race conditions where the driver may be in the
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+ * midst of being unloaded when we might receive an unsolicited message
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+ * from the host, we have implemented a mechanism to gurantee sequential
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+ * consistency:
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+ *
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+ * 1) Once the device is marked as being destroyed, we will fail all
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+ * outgoing messages.
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+ * 2) We permit incoming messages when the device is being destroyed,
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+ * only to properly account for messages already sent out.
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+ */
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+
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+static inline struct storvsc_device *get_out_stor_device(
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+ struct hv_device *device)
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+{
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+ struct storvsc_device *stor_device;
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+
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+ stor_device = hv_get_drvdata(device);
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+
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+ if (stor_device && stor_device->destroy)
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+ stor_device = NULL;
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+
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+ return stor_device;
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+}
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+
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+
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+static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
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+{
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+ dev->drain_notify = true;
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+ wait_event(dev->waiting_to_drain,
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+ atomic_read(&dev->num_outstanding_req) == 0);
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+ dev->drain_notify = false;
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+}
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+
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+static inline struct storvsc_device *get_in_stor_device(
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+ struct hv_device *device)
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+{
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+ struct storvsc_device *stor_device;
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+
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+ stor_device = hv_get_drvdata(device);
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+
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+ if (!stor_device)
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+ goto get_in_err;
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+
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+ /*
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+ * If the device is being destroyed; allow incoming
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+ * traffic only to cleanup outstanding requests.
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+ */
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+
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+ if (stor_device->destroy &&
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+ (atomic_read(&stor_device->num_outstanding_req) == 0))
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+ stor_device = NULL;
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+
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+get_in_err:
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+ return stor_device;
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+
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+}
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+
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+static void destroy_bounce_buffer(struct scatterlist *sgl,
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+ unsigned int sg_count)
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+{
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+ int i;
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+ struct page *page_buf;
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+
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+ for (i = 0; i < sg_count; i++) {
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+ page_buf = sg_page((&sgl[i]));
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+ if (page_buf != NULL)
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+ __free_page(page_buf);
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+ }
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+
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+ kfree(sgl);
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+}
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+
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+static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
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+{
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+ int i;
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|
+
|
|
+ /* No need to check */
|
|
+ if (sg_count < 2)
|
|
+ return -1;
|
|
+
|
|
+ /* We have at least 2 sg entries */
|
|
+ for (i = 0; i < sg_count; i++) {
|
|
+ if (i == 0) {
|
|
+ /* make sure 1st one does not have hole */
|
|
+ if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
|
|
+ return i;
|
|
+ } else if (i == sg_count - 1) {
|
|
+ /* make sure last one does not have hole */
|
|
+ if (sgl[i].offset != 0)
|
|
+ return i;
|
|
+ } else {
|
|
+ /* make sure no hole in the middle */
|
|
+ if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
|
|
+ return i;
|
|
+ }
|
|
+ }
|
|
+ return -1;
|
|
+}
|
|
+
|
|
+static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
|
|
+ unsigned int sg_count,
|
|
+ unsigned int len,
|
|
+ int write)
|
|
+{
|
|
+ int i;
|
|
+ int num_pages;
|
|
+ struct scatterlist *bounce_sgl;
|
|
+ struct page *page_buf;
|
|
+ unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
|
|
+
|
|
+ num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
|
|
+
|
|
+ bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
|
|
+ if (!bounce_sgl)
|
|
+ return NULL;
|
|
+
|
|
+ for (i = 0; i < num_pages; i++) {
|
|
+ page_buf = alloc_page(GFP_ATOMIC);
|
|
+ if (!page_buf)
|
|
+ goto cleanup;
|
|
+ sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
|
|
+ }
|
|
+
|
|
+ return bounce_sgl;
|
|
+
|
|
+cleanup:
|
|
+ destroy_bounce_buffer(bounce_sgl, num_pages);
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+/* Assume the original sgl has enough room */
|
|
+static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
|
|
+ struct scatterlist *bounce_sgl,
|
|
+ unsigned int orig_sgl_count,
|
|
+ unsigned int bounce_sgl_count)
|
|
+{
|
|
+ int i;
|
|
+ int j = 0;
|
|
+ unsigned long src, dest;
|
|
+ unsigned int srclen, destlen, copylen;
|
|
+ unsigned int total_copied = 0;
|
|
+ unsigned long bounce_addr = 0;
|
|
+ unsigned long dest_addr = 0;
|
|
+ unsigned long flags;
|
|
+
|
|
+ local_irq_save(flags);
|
|
+
|
|
+ for (i = 0; i < orig_sgl_count; i++) {
|
|
+ dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
|
|
+ KM_IRQ0) + orig_sgl[i].offset;
|
|
+ dest = dest_addr;
|
|
+ destlen = orig_sgl[i].length;
|
|
+
|
|
+ if (bounce_addr == 0)
|
|
+ bounce_addr =
|
|
+ (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
|
|
+ KM_IRQ0);
|
|
+
|
|
+ while (destlen) {
|
|
+ src = bounce_addr + bounce_sgl[j].offset;
|
|
+ srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
|
|
+
|
|
+ copylen = min(srclen, destlen);
|
|
+ memcpy((void *)dest, (void *)src, copylen);
|
|
+
|
|
+ total_copied += copylen;
|
|
+ bounce_sgl[j].offset += copylen;
|
|
+ destlen -= copylen;
|
|
+ dest += copylen;
|
|
+
|
|
+ if (bounce_sgl[j].offset == bounce_sgl[j].length) {
|
|
+ /* full */
|
|
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
|
|
+ j++;
|
|
+
|
|
+ /*
|
|
+ * It is possible that the number of elements
|
|
+ * in the bounce buffer may not be equal to
|
|
+ * the number of elements in the original
|
|
+ * scatter list. Handle this correctly.
|
|
+ */
|
|
+
|
|
+ if (j == bounce_sgl_count) {
|
|
+ /*
|
|
+ * We are done; cleanup and return.
|
|
+ */
|
|
+ kunmap_atomic((void *)(dest_addr -
|
|
+ orig_sgl[i].offset),
|
|
+ KM_IRQ0);
|
|
+ local_irq_restore(flags);
|
|
+ return total_copied;
|
|
+ }
|
|
+
|
|
+ /* if we need to use another bounce buffer */
|
|
+ if (destlen || i != orig_sgl_count - 1)
|
|
+ bounce_addr =
|
|
+ (unsigned long)kmap_atomic(
|
|
+ sg_page((&bounce_sgl[j])), KM_IRQ0);
|
|
+ } else if (destlen == 0 && i == orig_sgl_count - 1) {
|
|
+ /* unmap the last bounce that is < PAGE_SIZE */
|
|
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset),
|
|
+ KM_IRQ0);
|
|
+ }
|
|
+
|
|
+ local_irq_restore(flags);
|
|
+
|
|
+ return total_copied;
|
|
+}
|
|
+
|
|
+/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
|
|
+static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
|
|
+ struct scatterlist *bounce_sgl,
|
|
+ unsigned int orig_sgl_count)
|
|
+{
|
|
+ int i;
|
|
+ int j = 0;
|
|
+ unsigned long src, dest;
|
|
+ unsigned int srclen, destlen, copylen;
|
|
+ unsigned int total_copied = 0;
|
|
+ unsigned long bounce_addr = 0;
|
|
+ unsigned long src_addr = 0;
|
|
+ unsigned long flags;
|
|
+
|
|
+ local_irq_save(flags);
|
|
+
|
|
+ for (i = 0; i < orig_sgl_count; i++) {
|
|
+ src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
|
|
+ KM_IRQ0) + orig_sgl[i].offset;
|
|
+ src = src_addr;
|
|
+ srclen = orig_sgl[i].length;
|
|
+
|
|
+ if (bounce_addr == 0)
|
|
+ bounce_addr =
|
|
+ (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
|
|
+ KM_IRQ0);
|
|
+
|
|
+ while (srclen) {
|
|
+ /* assume bounce offset always == 0 */
|
|
+ dest = bounce_addr + bounce_sgl[j].length;
|
|
+ destlen = PAGE_SIZE - bounce_sgl[j].length;
|
|
+
|
|
+ copylen = min(srclen, destlen);
|
|
+ memcpy((void *)dest, (void *)src, copylen);
|
|
+
|
|
+ total_copied += copylen;
|
|
+ bounce_sgl[j].length += copylen;
|
|
+ srclen -= copylen;
|
|
+ src += copylen;
|
|
+
|
|
+ if (bounce_sgl[j].length == PAGE_SIZE) {
|
|
+ /* full..move to next entry */
|
|
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
|
|
+ j++;
|
|
+
|
|
+ /* if we need to use another bounce buffer */
|
|
+ if (srclen || i != orig_sgl_count - 1)
|
|
+ bounce_addr =
|
|
+ (unsigned long)kmap_atomic(
|
|
+ sg_page((&bounce_sgl[j])), KM_IRQ0);
|
|
+
|
|
+ } else if (srclen == 0 && i == orig_sgl_count - 1) {
|
|
+ /* unmap the last bounce that is < PAGE_SIZE */
|
|
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0);
|
|
+ }
|
|
+
|
|
+ local_irq_restore(flags);
|
|
+
|
|
+ return total_copied;
|
|
+}
|
|
+
|
|
+static int storvsc_channel_init(struct hv_device *device)
|
|
+{
|
|
+ struct storvsc_device *stor_device;
|
|
+ struct storvsc_cmd_request *request;
|
|
+ struct vstor_packet *vstor_packet;
|
|
+ int ret, t;
|
|
+
|
|
+ stor_device = get_out_stor_device(device);
|
|
+ if (!stor_device)
|
|
+ return -ENODEV;
|
|
+
|
|
+ request = &stor_device->init_request;
|
|
+ vstor_packet = &request->vstor_packet;
|
|
+
|
|
+ /*
|
|
+ * Now, initiate the vsc/vsp initialization protocol on the open
|
|
+ * channel
|
|
+ */
|
|
+ memset(request, 0, sizeof(struct storvsc_cmd_request));
|
|
+ init_completion(&request->wait_event);
|
|
+ vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
|
|
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
+
|
|
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
+ sizeof(struct vstor_packet),
|
|
+ (unsigned long)request,
|
|
+ VM_PKT_DATA_INBAND,
|
|
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
+ if (ret != 0)
|
|
+ goto cleanup;
|
|
+
|
|
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
+ if (t == 0) {
|
|
+ ret = -ETIMEDOUT;
|
|
+ goto cleanup;
|
|
+ }
|
|
+
|
|
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
+ vstor_packet->status != 0)
|
|
+ goto cleanup;
|
|
+
|
|
+
|
|
+ /* reuse the packet for version range supported */
|
|
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
|
|
+ vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
|
|
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
+
|
|
+ vstor_packet->version.major_minor =
|
|
+ storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR);
|
|
+
|
|
+ /*
|
|
+ * The revision number is only used in Windows; set it to 0.
|
|
+ */
|
|
+ vstor_packet->version.revision = 0;
|
|
+
|
|
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
+ sizeof(struct vstor_packet),
|
|
+ (unsigned long)request,
|
|
+ VM_PKT_DATA_INBAND,
|
|
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
+ if (ret != 0)
|
|
+ goto cleanup;
|
|
+
|
|
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
+ if (t == 0) {
|
|
+ ret = -ETIMEDOUT;
|
|
+ goto cleanup;
|
|
+ }
|
|
+
|
|
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
+ vstor_packet->status != 0)
|
|
+ goto cleanup;
|
|
+
|
|
+
|
|
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
|
|
+ vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
|
|
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
+ vstor_packet->storage_channel_properties.port_number =
|
|
+ stor_device->port_number;
|
|
+
|
|
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
+ sizeof(struct vstor_packet),
|
|
+ (unsigned long)request,
|
|
+ VM_PKT_DATA_INBAND,
|
|
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
+
|
|
+ if (ret != 0)
|
|
+ goto cleanup;
|
|
+
|
|
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
+ if (t == 0) {
|
|
+ ret = -ETIMEDOUT;
|
|
+ goto cleanup;
|
|
+ }
|
|
+
|
|
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
+ vstor_packet->status != 0)
|
|
+ goto cleanup;
|
|
+
|
|
+ stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
|
|
+ stor_device->target_id
|
|
+ = vstor_packet->storage_channel_properties.target_id;
|
|
+
|
|
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
|
|
+ vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
|
|
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
+
|
|
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
+ sizeof(struct vstor_packet),
|
|
+ (unsigned long)request,
|
|
+ VM_PKT_DATA_INBAND,
|
|
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
+
|
|
+ if (ret != 0)
|
|
+ goto cleanup;
|
|
+
|
|
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
+ if (t == 0) {
|
|
+ ret = -ETIMEDOUT;
|
|
+ goto cleanup;
|
|
+ }
|
|
+
|
|
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
+ vstor_packet->status != 0)
|
|
+ goto cleanup;
|
|
+
|
|
+
|
|
+cleanup:
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+
|
|
+static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
|
|
+{
|
|
+ struct scsi_cmnd *scmnd = cmd_request->cmd;
|
|
+ struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
|
|
+ void (*scsi_done_fn)(struct scsi_cmnd *);
|
|
+ struct scsi_sense_hdr sense_hdr;
|
|
+ struct vmscsi_request *vm_srb;
|
|
+ struct storvsc_scan_work *wrk;
|
|
+ struct stor_mem_pools *memp = scmnd->device->hostdata;
|
|
+
|
|
+ vm_srb = &cmd_request->vstor_packet.vm_srb;
|
|
+ if (cmd_request->bounce_sgl_count) {
|
|
+ if (vm_srb->data_in == READ_TYPE)
|
|
+ copy_from_bounce_buffer(scsi_sglist(scmnd),
|
|
+ cmd_request->bounce_sgl,
|
|
+ scsi_sg_count(scmnd),
|
|
+ cmd_request->bounce_sgl_count);
|
|
+ destroy_bounce_buffer(cmd_request->bounce_sgl,
|
|
+ cmd_request->bounce_sgl_count);
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * If there is an error; offline the device since all
|
|
+ * error recovery strategies would have already been
|
|
+ * deployed on the host side.
|
|
+ */
|
|
+ if (vm_srb->srb_status == SRB_STATUS_ERROR)
|
|
+ scmnd->result = DID_TARGET_FAILURE << 16;
|
|
+ else
|
|
+ scmnd->result = vm_srb->scsi_status;
|
|
+
|
|
+ /*
|
|
+ * If the LUN is invalid; remove the device.
|
|
+ */
|
|
+ if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) {
|
|
+ struct storvsc_device *stor_dev;
|
|
+ struct hv_device *dev = host_dev->dev;
|
|
+ struct Scsi_Host *host;
|
|
+
|
|
+ stor_dev = get_in_stor_device(dev);
|
|
+ host = stor_dev->host;
|
|
+
|
|
+ wrk = kmalloc(sizeof(struct storvsc_scan_work),
|
|
+ GFP_ATOMIC);
|
|
+ if (!wrk) {
|
|
+ scmnd->result = DID_TARGET_FAILURE << 16;
|
|
+ } else {
|
|
+ wrk->host = host;
|
|
+ wrk->lun = vm_srb->lun;
|
|
+ INIT_WORK(&wrk->work, storvsc_remove_lun);
|
|
+ schedule_work(&wrk->work);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (scmnd->result) {
|
|
+ if (scsi_normalize_sense(scmnd->sense_buffer,
|
|
+ SCSI_SENSE_BUFFERSIZE, &sense_hdr))
|
|
+ scsi_print_sense_hdr("storvsc", &sense_hdr);
|
|
+ }
|
|
+
|
|
+ scsi_set_resid(scmnd,
|
|
+ cmd_request->data_buffer.len -
|
|
+ vm_srb->data_transfer_length);
|
|
+
|
|
+ scsi_done_fn = scmnd->scsi_done;
|
|
+
|
|
+ scmnd->host_scribble = NULL;
|
|
+ scmnd->scsi_done = NULL;
|
|
+
|
|
+ scsi_done_fn(scmnd);
|
|
+
|
|
+ mempool_free(cmd_request, memp->request_mempool);
|
|
+}
|
|
+
|
|
+static void storvsc_on_io_completion(struct hv_device *device,
|
|
+ struct vstor_packet *vstor_packet,
|
|
+ struct storvsc_cmd_request *request)
|
|
+{
|
|
+ struct storvsc_device *stor_device;
|
|
+ struct vstor_packet *stor_pkt;
|
|
+
|
|
+ stor_device = hv_get_drvdata(device);
|
|
+ stor_pkt = &request->vstor_packet;
|
|
+
|
|
+ /*
|
|
+ * The current SCSI handling on the host side does
|
|
+ * not correctly handle:
|
|
+ * INQUIRY command with page code parameter set to 0x80
|
|
+ * MODE_SENSE command with cmd[2] == 0x1c
|
|
+ *
|
|
+ * Setup srb and scsi status so this won't be fatal.
|
|
+ * We do this so we can distinguish truly fatal failues
|
|
+ * (srb status == 0x4) and off-line the device in that case.
|
|
+ */
|
|
+
|
|
+ if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
|
|
+ (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
|
|
+ vstor_packet->vm_srb.scsi_status = 0;
|
|
+ vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
|
|
+ }
|
|
+
|
|
+
|
|
+ /* Copy over the status...etc */
|
|
+ stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
|
|
+ stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
|
|
+ stor_pkt->vm_srb.sense_info_length =
|
|
+ vstor_packet->vm_srb.sense_info_length;
|
|
+
|
|
+ if (vstor_packet->vm_srb.scsi_status != 0 ||
|
|
+ vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
|
|
+ dev_warn(&device->device,
|
|
+ "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
|
|
+ stor_pkt->vm_srb.cdb[0],
|
|
+ vstor_packet->vm_srb.scsi_status,
|
|
+ vstor_packet->vm_srb.srb_status);
|
|
+ }
|
|
+
|
|
+ if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
|
|
+ /* CHECK_CONDITION */
|
|
+ if (vstor_packet->vm_srb.srb_status &
|
|
+ SRB_STATUS_AUTOSENSE_VALID) {
|
|
+ /* autosense data available */
|
|
+ dev_warn(&device->device,
|
|
+ "stor pkt %p autosense data valid - len %d\n",
|
|
+ request,
|
|
+ vstor_packet->vm_srb.sense_info_length);
|
|
+
|
|
+ memcpy(request->sense_buffer,
|
|
+ vstor_packet->vm_srb.sense_data,
|
|
+ vstor_packet->vm_srb.sense_info_length);
|
|
+
|
|
+ }
|
|
+ }
|
|
+
|
|
+ stor_pkt->vm_srb.data_transfer_length =
|
|
+ vstor_packet->vm_srb.data_transfer_length;
|
|
+
|
|
+ storvsc_command_completion(request);
|
|
+
|
|
+ if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
|
|
+ stor_device->drain_notify)
|
|
+ wake_up(&stor_device->waiting_to_drain);
|
|
+
|
|
+
|
|
+}
|
|
+
|
|
+static void storvsc_on_receive(struct hv_device *device,
|
|
+ struct vstor_packet *vstor_packet,
|
|
+ struct storvsc_cmd_request *request)
|
|
+{
|
|
+ struct storvsc_scan_work *work;
|
|
+ struct storvsc_device *stor_device;
|
|
+
|
|
+ switch (vstor_packet->operation) {
|
|
+ case VSTOR_OPERATION_COMPLETE_IO:
|
|
+ storvsc_on_io_completion(device, vstor_packet, request);
|
|
+ break;
|
|
+
|
|
+ case VSTOR_OPERATION_REMOVE_DEVICE:
|
|
+ case VSTOR_OPERATION_ENUMERATE_BUS:
|
|
+ stor_device = get_in_stor_device(device);
|
|
+ work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
|
|
+ if (!work)
|
|
+ return;
|
|
+
|
|
+ INIT_WORK(&work->work, storvsc_bus_scan);
|
|
+ work->host = stor_device->host;
|
|
+ schedule_work(&work->work);
|
|
+ break;
|
|
+
|
|
+ default:
|
|
+ break;
|
|
+ }
|
|
+}
|
|
+
|
|
+static void storvsc_on_channel_callback(void *context)
|
|
+{
|
|
+ struct hv_device *device = (struct hv_device *)context;
|
|
+ struct storvsc_device *stor_device;
|
|
+ u32 bytes_recvd;
|
|
+ u64 request_id;
|
|
+ unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
|
|
+ struct storvsc_cmd_request *request;
|
|
+ int ret;
|
|
+
|
|
+
|
|
+ stor_device = get_in_stor_device(device);
|
|
+ if (!stor_device)
|
|
+ return;
|
|
+
|
|
+ do {
|
|
+ ret = vmbus_recvpacket(device->channel, packet,
|
|
+ ALIGN(sizeof(struct vstor_packet), 8),
|
|
+ &bytes_recvd, &request_id);
|
|
+ if (ret == 0 && bytes_recvd > 0) {
|
|
+
|
|
+ request = (struct storvsc_cmd_request *)
|
|
+ (unsigned long)request_id;
|
|
+
|
|
+ if ((request == &stor_device->init_request) ||
|
|
+ (request == &stor_device->reset_request)) {
|
|
+
|
|
+ memcpy(&request->vstor_packet, packet,
|
|
+ sizeof(struct vstor_packet));
|
|
+ complete(&request->wait_event);
|
|
+ } else {
|
|
+ storvsc_on_receive(device,
|
|
+ (struct vstor_packet *)packet,
|
|
+ request);
|
|
+ }
|
|
+ } else {
|
|
+ break;
|
|
+ }
|
|
+ } while (1);
|
|
+
|
|
+ return;
|
|
+}
|
|
+
|
|
+static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
|
|
+{
|
|
+ struct vmstorage_channel_properties props;
|
|
+ int ret;
|
|
+
|
|
+ memset(&props, 0, sizeof(struct vmstorage_channel_properties));
|
|
+
|
|
+ ret = vmbus_open(device->channel,
|
|
+ ring_size,
|
|
+ ring_size,
|
|
+ (void *)&props,
|
|
+ sizeof(struct vmstorage_channel_properties),
|
|
+ storvsc_on_channel_callback, device);
|
|
+
|
|
+ if (ret != 0)
|
|
+ return ret;
|
|
+
|
|
+ ret = storvsc_channel_init(device);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int storvsc_dev_remove(struct hv_device *device)
|
|
+{
|
|
+ struct storvsc_device *stor_device;
|
|
+ unsigned long flags;
|
|
+
|
|
+ stor_device = hv_get_drvdata(device);
|
|
+
|
|
+ spin_lock_irqsave(&device->channel->inbound_lock, flags);
|
|
+ stor_device->destroy = true;
|
|
+ spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
|
|
+
|
|
+ /*
|
|
+ * At this point, all outbound traffic should be disable. We
|
|
+ * only allow inbound traffic (responses) to proceed so that
|
|
+ * outstanding requests can be completed.
|
|
+ */
|
|
+
|
|
+ storvsc_wait_to_drain(stor_device);
|
|
+
|
|
+ /*
|
|
+ * Since we have already drained, we don't need to busy wait
|
|
+ * as was done in final_release_stor_device()
|
|
+ * Note that we cannot set the ext pointer to NULL until
|
|
+ * we have drained - to drain the outgoing packets, we need to
|
|
+ * allow incoming packets.
|
|
+ */
|
|
+ spin_lock_irqsave(&device->channel->inbound_lock, flags);
|
|
+ hv_set_drvdata(device, NULL);
|
|
+ spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
|
|
+
|
|
+ /* Close the channel */
|
|
+ vmbus_close(device->channel);
|
|
+
|
|
+ kfree(stor_device);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int storvsc_do_io(struct hv_device *device,
|
|
+ struct storvsc_cmd_request *request)
|
|
+{
|
|
+ struct storvsc_device *stor_device;
|
|
+ struct vstor_packet *vstor_packet;
|
|
+ int ret = 0;
|
|
+
|
|
+ vstor_packet = &request->vstor_packet;
|
|
+ stor_device = get_out_stor_device(device);
|
|
+
|
|
+ if (!stor_device)
|
|
+ return -ENODEV;
|
|
+
|
|
+
|
|
+ request->device = device;
|
|
+
|
|
+
|
|
+ vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
|
|
+
|
|
+ vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
|
|
+
|
|
+
|
|
+ vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE;
|
|
+
|
|
+
|
|
+ vstor_packet->vm_srb.data_transfer_length =
|
|
+ request->data_buffer.len;
|
|
+
|
|
+ vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
|
|
+
|
|
+ if (request->data_buffer.len) {
|
|
+ ret = vmbus_sendpacket_multipagebuffer(device->channel,
|
|
+ &request->data_buffer,
|
|
+ vstor_packet,
|
|
+ sizeof(struct vstor_packet),
|
|
+ (unsigned long)request);
|
|
+ } else {
|
|
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
+ sizeof(struct vstor_packet),
|
|
+ (unsigned long)request,
|
|
+ VM_PKT_DATA_INBAND,
|
|
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
+ }
|
|
+
|
|
+ if (ret != 0)
|
|
+ return ret;
|
|
+
|
|
+ atomic_inc(&stor_device->num_outstanding_req);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int storvsc_device_alloc(struct scsi_device *sdevice)
|
|
+{
|
|
+ struct stor_mem_pools *memp;
|
|
+ int number = STORVSC_MIN_BUF_NR;
|
|
+
|
|
+ memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
|
|
+ if (!memp)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ memp->request_pool =
|
|
+ kmem_cache_create(dev_name(&sdevice->sdev_dev),
|
|
+ sizeof(struct storvsc_cmd_request), 0,
|
|
+ SLAB_HWCACHE_ALIGN, NULL);
|
|
+
|
|
+ if (!memp->request_pool)
|
|
+ goto err0;
|
|
+
|
|
+ memp->request_mempool = mempool_create(number, mempool_alloc_slab,
|
|
+ mempool_free_slab,
|
|
+ memp->request_pool);
|
|
+
|
|
+ if (!memp->request_mempool)
|
|
+ goto err1;
|
|
+
|
|
+ sdevice->hostdata = memp;
|
|
+
|
|
+ return 0;
|
|
+
|
|
+err1:
|
|
+ kmem_cache_destroy(memp->request_pool);
|
|
+
|
|
+err0:
|
|
+ kfree(memp);
|
|
+ return -ENOMEM;
|
|
+}
|
|
+
|
|
+static void storvsc_device_destroy(struct scsi_device *sdevice)
|
|
+{
|
|
+ struct stor_mem_pools *memp = sdevice->hostdata;
|
|
+
|
|
+ mempool_destroy(memp->request_mempool);
|
|
+ kmem_cache_destroy(memp->request_pool);
|
|
+ kfree(memp);
|
|
+ sdevice->hostdata = NULL;
|
|
+}
|
|
+
|
|
+static int storvsc_device_configure(struct scsi_device *sdevice)
|
|
+{
|
|
+ scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
|
|
+ STORVSC_MAX_IO_REQUESTS);
|
|
+
|
|
+ blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
|
|
+
|
|
+ blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
|
|
+ sector_t capacity, int *info)
|
|
+{
|
|
+ sector_t nsect = capacity;
|
|
+ sector_t cylinders = nsect;
|
|
+ int heads, sectors_pt;
|
|
+
|
|
+ /*
|
|
+ * We are making up these values; let us keep it simple.
|
|
+ */
|
|
+ heads = 0xff;
|
|
+ sectors_pt = 0x3f; /* Sectors per track */
|
|
+ sector_div(cylinders, heads * sectors_pt);
|
|
+ if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
|
|
+ cylinders = 0xffff;
|
|
+
|
|
+ info[0] = heads;
|
|
+ info[1] = sectors_pt;
|
|
+ info[2] = (int)cylinders;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
|
|
+{
|
|
+ struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
|
|
+ struct hv_device *device = host_dev->dev;
|
|
+
|
|
+ struct storvsc_device *stor_device;
|
|
+ struct storvsc_cmd_request *request;
|
|
+ struct vstor_packet *vstor_packet;
|
|
+ int ret, t;
|
|
+
|
|
+
|
|
+ stor_device = get_out_stor_device(device);
|
|
+ if (!stor_device)
|
|
+ return FAILED;
|
|
+
|
|
+ request = &stor_device->reset_request;
|
|
+ vstor_packet = &request->vstor_packet;
|
|
+
|
|
+ init_completion(&request->wait_event);
|
|
+
|
|
+ vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
|
|
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
+ vstor_packet->vm_srb.path_id = stor_device->path_id;
|
|
+
|
|
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
+ sizeof(struct vstor_packet),
|
|
+ (unsigned long)&stor_device->reset_request,
|
|
+ VM_PKT_DATA_INBAND,
|
|
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
+ if (ret != 0)
|
|
+ return FAILED;
|
|
+
|
|
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
+ if (t == 0)
|
|
+ return TIMEOUT_ERROR;
|
|
+
|
|
+
|
|
+ /*
|
|
+ * At this point, all outstanding requests in the adapter
|
|
+ * should have been flushed out and return to us
|
|
+ * There is a potential race here where the host may be in
|
|
+ * the process of responding when we return from here.
|
|
+ * Just wait for all in-transit packets to be accounted for
|
|
+ * before we return from here.
|
|
+ */
|
|
+ storvsc_wait_to_drain(stor_device);
|
|
+
|
|
+ return SUCCESS;
|
|
+}
|
|
+
|
|
+static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
|
|
+{
|
|
+ bool allowed = true;
|
|
+ u8 scsi_op = scmnd->cmnd[0];
|
|
+
|
|
+ switch (scsi_op) {
|
|
+ /*
|
|
+ * smartd sends this command and the host does not handle
|
|
+ * this. So, don't send it.
|
|
+ */
|
|
+ case SET_WINDOW:
|
|
+ scmnd->result = ILLEGAL_REQUEST << 16;
|
|
+ allowed = false;
|
|
+ break;
|
|
+ default:
|
|
+ break;
|
|
+ }
|
|
+ return allowed;
|
|
+}
|
|
+
|
|
+static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
|
|
+{
|
|
+ int ret;
|
|
+ struct hv_host_device *host_dev = shost_priv(host);
|
|
+ struct hv_device *dev = host_dev->dev;
|
|
+ struct storvsc_cmd_request *cmd_request;
|
|
+ unsigned int request_size = 0;
|
|
+ int i;
|
|
+ struct scatterlist *sgl;
|
|
+ unsigned int sg_count = 0;
|
|
+ struct vmscsi_request *vm_srb;
|
|
+ struct stor_mem_pools *memp = scmnd->device->hostdata;
|
|
+
|
|
+ if (!storvsc_scsi_cmd_ok(scmnd)) {
|
|
+ scmnd->scsi_done(scmnd);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ request_size = sizeof(struct storvsc_cmd_request);
|
|
+
|
|
+ cmd_request = mempool_alloc(memp->request_mempool,
|
|
+ GFP_ATOMIC);
|
|
+
|
|
+ /*
|
|
+ * We might be invoked in an interrupt context; hence
|
|
+ * mempool_alloc() can fail.
|
|
+ */
|
|
+ if (!cmd_request)
|
|
+ return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
+
|
|
+ memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
|
|
+
|
|
+ /* Setup the cmd request */
|
|
+ cmd_request->cmd = scmnd;
|
|
+
|
|
+ scmnd->host_scribble = (unsigned char *)cmd_request;
|
|
+
|
|
+ vm_srb = &cmd_request->vstor_packet.vm_srb;
|
|
+
|
|
+
|
|
+ /* Build the SRB */
|
|
+ switch (scmnd->sc_data_direction) {
|
|
+ case DMA_TO_DEVICE:
|
|
+ vm_srb->data_in = WRITE_TYPE;
|
|
+ break;
|
|
+ case DMA_FROM_DEVICE:
|
|
+ vm_srb->data_in = READ_TYPE;
|
|
+ break;
|
|
+ default:
|
|
+ vm_srb->data_in = UNKNOWN_TYPE;
|
|
+ break;
|
|
+ }
|
|
+
|
|
+
|
|
+ vm_srb->port_number = host_dev->port;
|
|
+ vm_srb->path_id = scmnd->device->channel;
|
|
+ vm_srb->target_id = scmnd->device->id;
|
|
+ vm_srb->lun = scmnd->device->lun;
|
|
+
|
|
+ vm_srb->cdb_length = scmnd->cmd_len;
|
|
+
|
|
+ memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
|
|
+
|
|
+ cmd_request->sense_buffer = scmnd->sense_buffer;
|
|
+
|
|
+
|
|
+ cmd_request->data_buffer.len = scsi_bufflen(scmnd);
|
|
+ if (scsi_sg_count(scmnd)) {
|
|
+ sgl = (struct scatterlist *)scsi_sglist(scmnd);
|
|
+ sg_count = scsi_sg_count(scmnd);
|
|
+
|
|
+ /* check if we need to bounce the sgl */
|
|
+ if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
|
|
+ cmd_request->bounce_sgl =
|
|
+ create_bounce_buffer(sgl, scsi_sg_count(scmnd),
|
|
+ scsi_bufflen(scmnd),
|
|
+ vm_srb->data_in);
|
|
+ if (!cmd_request->bounce_sgl) {
|
|
+ ret = SCSI_MLQUEUE_HOST_BUSY;
|
|
+ goto queue_error;
|
|
+ }
|
|
+
|
|
+ cmd_request->bounce_sgl_count =
|
|
+ ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
|
|
+ PAGE_SHIFT;
|
|
+
|
|
+ if (vm_srb->data_in == WRITE_TYPE)
|
|
+ copy_to_bounce_buffer(sgl,
|
|
+ cmd_request->bounce_sgl,
|
|
+ scsi_sg_count(scmnd));
|
|
+
|
|
+ sgl = cmd_request->bounce_sgl;
|
|
+ sg_count = cmd_request->bounce_sgl_count;
|
|
+ }
|
|
+
|
|
+ cmd_request->data_buffer.offset = sgl[0].offset;
|
|
+
|
|
+ for (i = 0; i < sg_count; i++)
|
|
+ cmd_request->data_buffer.pfn_array[i] =
|
|
+ page_to_pfn(sg_page((&sgl[i])));
|
|
+
|
|
+ } else if (scsi_sglist(scmnd)) {
|
|
+ cmd_request->data_buffer.offset =
|
|
+ virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
|
|
+ cmd_request->data_buffer.pfn_array[0] =
|
|
+ virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
|
|
+ }
|
|
+
|
|
+ /* Invokes the vsc to start an IO */
|
|
+ ret = storvsc_do_io(dev, cmd_request);
|
|
+
|
|
+ if (ret == -EAGAIN) {
|
|
+ /* no more space */
|
|
+
|
|
+ if (cmd_request->bounce_sgl_count) {
|
|
+ destroy_bounce_buffer(cmd_request->bounce_sgl,
|
|
+ cmd_request->bounce_sgl_count);
|
|
+
|
|
+ ret = SCSI_MLQUEUE_DEVICE_BUSY;
|
|
+ goto queue_error;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+
|
|
+queue_error:
|
|
+ mempool_free(cmd_request, memp->request_mempool);
|
|
+ scmnd->host_scribble = NULL;
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static struct scsi_host_template scsi_driver = {
|
|
+ .module = THIS_MODULE,
|
|
+ .name = "storvsc_host_t",
|
|
+ .bios_param = storvsc_get_chs,
|
|
+ .queuecommand = storvsc_queuecommand,
|
|
+ .eh_host_reset_handler = storvsc_host_reset_handler,
|
|
+ .slave_alloc = storvsc_device_alloc,
|
|
+ .slave_destroy = storvsc_device_destroy,
|
|
+ .slave_configure = storvsc_device_configure,
|
|
+ .cmd_per_lun = 1,
|
|
+ /* 64 max_queue * 1 target */
|
|
+ .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
|
|
+ .this_id = -1,
|
|
+ /* no use setting to 0 since ll_blk_rw reset it to 1 */
|
|
+ /* currently 32 */
|
|
+ .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
|
|
+ .use_clustering = DISABLE_CLUSTERING,
|
|
+ /* Make sure we dont get a sg segment crosses a page boundary */
|
|
+ .dma_boundary = PAGE_SIZE-1,
|
|
+};
|
|
+
|
|
+enum {
|
|
+ SCSI_GUID,
|
|
+ IDE_GUID,
|
|
+};
|
|
+
|
|
+static const struct hv_vmbus_device_id id_table[] = {
|
|
+ /* SCSI guid */
|
|
+ { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
|
|
+ 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
|
|
+ .driver_data = SCSI_GUID },
|
|
+ /* IDE guid */
|
|
+ { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
|
|
+ 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
|
|
+ .driver_data = IDE_GUID },
|
|
+ { },
|
|
+};
|
|
+
|
|
+MODULE_DEVICE_TABLE(vmbus, id_table);
|
|
+
|
|
+static int storvsc_probe(struct hv_device *device,
|
|
+ const struct hv_vmbus_device_id *dev_id)
|
|
+{
|
|
+ int ret;
|
|
+ struct Scsi_Host *host;
|
|
+ struct hv_host_device *host_dev;
|
|
+ bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
|
|
+ int target = 0;
|
|
+ struct storvsc_device *stor_device;
|
|
+
|
|
+ host = scsi_host_alloc(&scsi_driver,
|
|
+ sizeof(struct hv_host_device));
|
|
+ if (!host)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ host_dev = shost_priv(host);
|
|
+ memset(host_dev, 0, sizeof(struct hv_host_device));
|
|
+
|
|
+ host_dev->port = host->host_no;
|
|
+ host_dev->dev = device;
|
|
+
|
|
+
|
|
+ stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
|
|
+ if (!stor_device) {
|
|
+ ret = -ENOMEM;
|
|
+ goto err_out0;
|
|
+ }
|
|
+
|
|
+ stor_device->destroy = false;
|
|
+ init_waitqueue_head(&stor_device->waiting_to_drain);
|
|
+ stor_device->device = device;
|
|
+ stor_device->host = host;
|
|
+ hv_set_drvdata(device, stor_device);
|
|
+
|
|
+ stor_device->port_number = host->host_no;
|
|
+ ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
|
|
+ if (ret)
|
|
+ goto err_out1;
|
|
+
|
|
+ host_dev->path = stor_device->path_id;
|
|
+ host_dev->target = stor_device->target_id;
|
|
+
|
|
+ /* max # of devices per target */
|
|
+ host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
|
|
+ /* max # of targets per channel */
|
|
+ host->max_id = STORVSC_MAX_TARGETS;
|
|
+ /* max # of channels */
|
|
+ host->max_channel = STORVSC_MAX_CHANNELS - 1;
|
|
+ /* max cmd length */
|
|
+ host->max_cmd_len = STORVSC_MAX_CMD_LEN;
|
|
+
|
|
+ /* Register the HBA and start the scsi bus scan */
|
|
+ ret = scsi_add_host(host, &device->device);
|
|
+ if (ret != 0)
|
|
+ goto err_out2;
|
|
+
|
|
+ if (!dev_is_ide) {
|
|
+ scsi_scan_host(host);
|
|
+ } else {
|
|
+ target = (device->dev_instance.b[5] << 8 |
|
|
+ device->dev_instance.b[4]);
|
|
+ ret = scsi_add_device(host, 0, target, 0);
|
|
+ if (ret) {
|
|
+ scsi_remove_host(host);
|
|
+ goto err_out2;
|
|
+ }
|
|
+ }
|
|
+ return 0;
|
|
+
|
|
+err_out2:
|
|
+ /*
|
|
+ * Once we have connected with the host, we would need to
|
|
+ * to invoke storvsc_dev_remove() to rollback this state and
|
|
+ * this call also frees up the stor_device; hence the jump around
|
|
+ * err_out1 label.
|
|
+ */
|
|
+ storvsc_dev_remove(device);
|
|
+ goto err_out0;
|
|
+
|
|
+err_out1:
|
|
+ kfree(stor_device);
|
|
+
|
|
+err_out0:
|
|
+ scsi_host_put(host);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int storvsc_remove(struct hv_device *dev)
|
|
+{
|
|
+ struct storvsc_device *stor_device = hv_get_drvdata(dev);
|
|
+ struct Scsi_Host *host = stor_device->host;
|
|
+
|
|
+ scsi_remove_host(host);
|
|
+ storvsc_dev_remove(dev);
|
|
+ scsi_host_put(host);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct hv_driver storvsc_drv = {
|
|
+ .name = KBUILD_MODNAME,
|
|
+ .id_table = id_table,
|
|
+ .probe = storvsc_probe,
|
|
+ .remove = storvsc_remove,
|
|
+};
|
|
+
|
|
+static int __init storvsc_drv_init(void)
|
|
+{
|
|
+ u32 max_outstanding_req_per_channel;
|
|
+
|
|
+ /*
|
|
+ * 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_multipage_buffer + struct vstor_packet + u64)
|
|
+ */
|
|
+ max_outstanding_req_per_channel =
|
|
+ ((storvsc_ringbuffer_size - PAGE_SIZE) /
|
|
+ ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
|
|
+ sizeof(struct vstor_packet) + sizeof(u64),
|
|
+ sizeof(u64)));
|
|
+
|
|
+ if (max_outstanding_req_per_channel <
|
|
+ STORVSC_MAX_IO_REQUESTS)
|
|
+ return -EINVAL;
|
|
+
|
|
+ return vmbus_driver_register(&storvsc_drv);
|
|
+}
|
|
+
|
|
+static void __exit storvsc_drv_exit(void)
|
|
+{
|
|
+ vmbus_driver_unregister(&storvsc_drv);
|
|
+}
|
|
+
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_VERSION(HV_DRV_VERSION);
|
|
+MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
|
|
+module_init(storvsc_drv_init);
|
|
+module_exit(storvsc_drv_exit);
|
|
--- a/drivers/staging/Kconfig
|
|
+++ b/drivers/staging/Kconfig
|
|
@@ -80,8 +80,6 @@ source "drivers/staging/vt6655/Kconfig"
|
|
|
|
source "drivers/staging/vt6656/Kconfig"
|
|
|
|
-source "drivers/staging/hv/Kconfig"
|
|
-
|
|
source "drivers/staging/vme/Kconfig"
|
|
|
|
source "drivers/staging/sep/Kconfig"
|
|
--- a/drivers/staging/Makefile
|
|
+++ b/drivers/staging/Makefile
|
|
@@ -31,7 +31,6 @@ obj-$(CONFIG_USB_SERIAL_QUATECH_USB2) +=
|
|
obj-$(CONFIG_OCTEON_ETHERNET) += octeon/
|
|
obj-$(CONFIG_VT6655) += vt6655/
|
|
obj-$(CONFIG_VT6656) += vt6656/
|
|
-obj-$(CONFIG_HYPERV) += hv/
|
|
obj-$(CONFIG_VME_BUS) += vme/
|
|
obj-$(CONFIG_DX_SEP) += sep/
|
|
obj-$(CONFIG_IIO) += iio/
|
|
--- a/drivers/staging/hv/Kconfig
|
|
+++ /dev/null
|
|
@@ -1,5 +0,0 @@
|
|
-config HYPERV_STORAGE
|
|
- tristate "Microsoft Hyper-V virtual storage driver"
|
|
- depends on HYPERV && SCSI
|
|
- help
|
|
- Select this option to enable the Hyper-V virtual storage driver.
|
|
--- a/drivers/staging/hv/Makefile
|
|
+++ /dev/null
|
|
@@ -1,3 +0,0 @@
|
|
-obj-$(CONFIG_HYPERV_STORAGE) += hv_storvsc.o
|
|
-
|
|
-hv_storvsc-y := storvsc_drv.o
|
|
--- a/drivers/staging/hv/TODO
|
|
+++ /dev/null
|
|
@@ -1,5 +0,0 @@
|
|
-TODO:
|
|
- - audit the scsi driver
|
|
-
|
|
-Please send patches for this code to Greg Kroah-Hartman <gregkh@suse.de>,
|
|
-Haiyang Zhang <haiyangz@microsoft.com>, and K. Y. Srinivasan <kys@microsoft.com>
|
|
--- a/drivers/staging/hv/storvsc_drv.c
|
|
+++ /dev/null
|
|
@@ -1,1553 +0,0 @@
|
|
-/*
|
|
- * 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>
|
|
- * K. Y. Srinivasan <kys@microsoft.com>
|
|
- */
|
|
-
|
|
-#include <linux/kernel.h>
|
|
-#include <linux/wait.h>
|
|
-#include <linux/sched.h>
|
|
-#include <linux/completion.h>
|
|
-#include <linux/string.h>
|
|
-#include <linux/mm.h>
|
|
-#include <linux/delay.h>
|
|
-#include <linux/init.h>
|
|
-#include <linux/slab.h>
|
|
-#include <linux/module.h>
|
|
-#include <linux/device.h>
|
|
-#include <linux/hyperv.h>
|
|
-#include <linux/mempool.h>
|
|
-#include <scsi/scsi.h>
|
|
-#include <scsi/scsi_cmnd.h>
|
|
-#include <scsi/scsi_host.h>
|
|
-#include <scsi/scsi_device.h>
|
|
-#include <scsi/scsi_tcq.h>
|
|
-#include <scsi/scsi_eh.h>
|
|
-#include <scsi/scsi_devinfo.h>
|
|
-#include <scsi/scsi_dbg.h>
|
|
-
|
|
-/*
|
|
- * All wire protocol details (storage protocol between the guest and the host)
|
|
- * are consolidated here.
|
|
- *
|
|
- * Begin protocol definitions.
|
|
- */
|
|
-
|
|
-/*
|
|
- * Version history:
|
|
- * V1 Beta: 0.1
|
|
- * V1 RC < 2008/1/31: 1.0
|
|
- * V1 RC > 2008/1/31: 2.0
|
|
- * Win7: 4.2
|
|
- */
|
|
-
|
|
-#define VMSTOR_CURRENT_MAJOR 4
|
|
-#define VMSTOR_CURRENT_MINOR 2
|
|
-
|
|
-
|
|
-/* Packet structure describing virtual storage requests. */
|
|
-enum vstor_packet_operation {
|
|
- VSTOR_OPERATION_COMPLETE_IO = 1,
|
|
- VSTOR_OPERATION_REMOVE_DEVICE = 2,
|
|
- VSTOR_OPERATION_EXECUTE_SRB = 3,
|
|
- VSTOR_OPERATION_RESET_LUN = 4,
|
|
- VSTOR_OPERATION_RESET_ADAPTER = 5,
|
|
- VSTOR_OPERATION_RESET_BUS = 6,
|
|
- VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
|
|
- VSTOR_OPERATION_END_INITIALIZATION = 8,
|
|
- VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
|
|
- VSTOR_OPERATION_QUERY_PROPERTIES = 10,
|
|
- VSTOR_OPERATION_ENUMERATE_BUS = 11,
|
|
- VSTOR_OPERATION_MAXIMUM = 11
|
|
-};
|
|
-
|
|
-/*
|
|
- * Platform neutral description of a scsi request -
|
|
- * this remains the same across the write regardless of 32/64 bit
|
|
- * note: it's patterned off the SCSI_PASS_THROUGH structure
|
|
- */
|
|
-#define STORVSC_MAX_CMD_LEN 0x10
|
|
-#define STORVSC_SENSE_BUFFER_SIZE 0x12
|
|
-#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
|
|
-
|
|
-struct vmscsi_request {
|
|
- u16 length;
|
|
- u8 srb_status;
|
|
- u8 scsi_status;
|
|
-
|
|
- u8 port_number;
|
|
- u8 path_id;
|
|
- u8 target_id;
|
|
- u8 lun;
|
|
-
|
|
- u8 cdb_length;
|
|
- u8 sense_info_length;
|
|
- u8 data_in;
|
|
- u8 reserved;
|
|
-
|
|
- u32 data_transfer_length;
|
|
-
|
|
- union {
|
|
- u8 cdb[STORVSC_MAX_CMD_LEN];
|
|
- u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
|
|
- u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
|
|
- };
|
|
-} __attribute((packed));
|
|
-
|
|
-
|
|
-/*
|
|
- * This structure is sent during the intialization phase to get the different
|
|
- * properties of the channel.
|
|
- */
|
|
-struct vmstorage_channel_properties {
|
|
- u16 protocol_version;
|
|
- u8 path_id;
|
|
- u8 target_id;
|
|
-
|
|
- /* Note: port number is only really known on the client side */
|
|
- u32 port_number;
|
|
- u32 flags;
|
|
- u32 max_transfer_bytes;
|
|
-
|
|
- /*
|
|
- * This id is unique for each channel and will correspond with
|
|
- * vendor specific data in the inquiry data.
|
|
- */
|
|
-
|
|
- u64 unique_id;
|
|
-} __packed;
|
|
-
|
|
-/* This structure is sent during the storage protocol negotiations. */
|
|
-struct vmstorage_protocol_version {
|
|
- /* Major (MSW) and minor (LSW) version numbers. */
|
|
- u16 major_minor;
|
|
-
|
|
- /*
|
|
- * Revision number is auto-incremented whenever this file is changed
|
|
- * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
|
|
- * definitely indicate incompatibility--but it does indicate mismatched
|
|
- * builds.
|
|
- * This is only used on the windows side. Just set it to 0.
|
|
- */
|
|
- u16 revision;
|
|
-} __packed;
|
|
-
|
|
-/* Channel Property Flags */
|
|
-#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
|
|
-#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
|
|
-
|
|
-struct vstor_packet {
|
|
- /* Requested operation type */
|
|
- enum vstor_packet_operation operation;
|
|
-
|
|
- /* Flags - see below for values */
|
|
- u32 flags;
|
|
-
|
|
- /* Status of the request returned from the server side. */
|
|
- u32 status;
|
|
-
|
|
- /* Data payload area */
|
|
- union {
|
|
- /*
|
|
- * Structure used to forward SCSI commands from the
|
|
- * client to the server.
|
|
- */
|
|
- struct vmscsi_request vm_srb;
|
|
-
|
|
- /* Structure used to query channel properties. */
|
|
- struct vmstorage_channel_properties storage_channel_properties;
|
|
-
|
|
- /* Used during version negotiations. */
|
|
- struct vmstorage_protocol_version version;
|
|
- };
|
|
-} __packed;
|
|
-
|
|
-/*
|
|
- * Packet Flags:
|
|
- *
|
|
- * This flag indicates that the server should send back a completion for this
|
|
- * packet.
|
|
- */
|
|
-
|
|
-#define REQUEST_COMPLETION_FLAG 0x1
|
|
-
|
|
-/* Matches Windows-end */
|
|
-enum storvsc_request_type {
|
|
- WRITE_TYPE = 0,
|
|
- READ_TYPE,
|
|
- UNKNOWN_TYPE,
|
|
-};
|
|
-
|
|
-/*
|
|
- * SRB status codes and masks; a subset of the codes used here.
|
|
- */
|
|
-
|
|
-#define SRB_STATUS_AUTOSENSE_VALID 0x80
|
|
-#define SRB_STATUS_INVALID_LUN 0x20
|
|
-#define SRB_STATUS_SUCCESS 0x01
|
|
-#define SRB_STATUS_ERROR 0x04
|
|
-
|
|
-/*
|
|
- * This is the end of Protocol specific defines.
|
|
- */
|
|
-
|
|
-
|
|
-/*
|
|
- * We setup a mempool to allocate request structures for this driver
|
|
- * on a per-lun basis. The following define specifies the number of
|
|
- * elements in the pool.
|
|
- */
|
|
-
|
|
-#define STORVSC_MIN_BUF_NR 64
|
|
-static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
|
|
-
|
|
-module_param(storvsc_ringbuffer_size, int, S_IRUGO);
|
|
-MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
|
|
-
|
|
-#define STORVSC_MAX_IO_REQUESTS 128
|
|
-
|
|
-/*
|
|
- * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
|
|
- * reality, the path/target is not used (ie always set to 0) so our
|
|
- * scsi host adapter essentially has 1 bus with 1 target that contains
|
|
- * up to 256 luns.
|
|
- */
|
|
-#define STORVSC_MAX_LUNS_PER_TARGET 64
|
|
-#define STORVSC_MAX_TARGETS 1
|
|
-#define STORVSC_MAX_CHANNELS 1
|
|
-
|
|
-
|
|
-
|
|
-struct storvsc_cmd_request {
|
|
- struct list_head entry;
|
|
- struct scsi_cmnd *cmd;
|
|
-
|
|
- unsigned int bounce_sgl_count;
|
|
- struct scatterlist *bounce_sgl;
|
|
-
|
|
- struct hv_device *device;
|
|
-
|
|
- /* Synchronize the request/response if needed */
|
|
- struct completion wait_event;
|
|
-
|
|
- unsigned char *sense_buffer;
|
|
- struct hv_multipage_buffer data_buffer;
|
|
- struct vstor_packet vstor_packet;
|
|
-};
|
|
-
|
|
-
|
|
-/* A storvsc device is a device object that contains a vmbus channel */
|
|
-struct storvsc_device {
|
|
- struct hv_device *device;
|
|
-
|
|
- bool destroy;
|
|
- bool drain_notify;
|
|
- atomic_t num_outstanding_req;
|
|
- struct Scsi_Host *host;
|
|
-
|
|
- wait_queue_head_t waiting_to_drain;
|
|
-
|
|
- /*
|
|
- * Each unique Port/Path/Target represents 1 channel ie scsi
|
|
- * controller. In reality, the pathid, targetid is always 0
|
|
- * and the port is set by us
|
|
- */
|
|
- unsigned int port_number;
|
|
- unsigned char path_id;
|
|
- unsigned char target_id;
|
|
-
|
|
- /* Used for vsc/vsp channel reset process */
|
|
- struct storvsc_cmd_request init_request;
|
|
- struct storvsc_cmd_request reset_request;
|
|
-};
|
|
-
|
|
-struct stor_mem_pools {
|
|
- struct kmem_cache *request_pool;
|
|
- mempool_t *request_mempool;
|
|
-};
|
|
-
|
|
-struct hv_host_device {
|
|
- struct hv_device *dev;
|
|
- unsigned int port;
|
|
- unsigned char path;
|
|
- unsigned char target;
|
|
-};
|
|
-
|
|
-struct storvsc_scan_work {
|
|
- struct work_struct work;
|
|
- struct Scsi_Host *host;
|
|
- uint lun;
|
|
-};
|
|
-
|
|
-static void storvsc_bus_scan(struct work_struct *work)
|
|
-{
|
|
- struct storvsc_scan_work *wrk;
|
|
- int id, order_id;
|
|
-
|
|
- wrk = container_of(work, struct storvsc_scan_work, work);
|
|
- for (id = 0; id < wrk->host->max_id; ++id) {
|
|
- if (wrk->host->reverse_ordering)
|
|
- order_id = wrk->host->max_id - id - 1;
|
|
- else
|
|
- order_id = id;
|
|
-
|
|
- scsi_scan_target(&wrk->host->shost_gendev, 0,
|
|
- order_id, SCAN_WILD_CARD, 1);
|
|
- }
|
|
- kfree(wrk);
|
|
-}
|
|
-
|
|
-static void storvsc_remove_lun(struct work_struct *work)
|
|
-{
|
|
- struct storvsc_scan_work *wrk;
|
|
- struct scsi_device *sdev;
|
|
-
|
|
- wrk = container_of(work, struct storvsc_scan_work, work);
|
|
- if (!scsi_host_get(wrk->host))
|
|
- goto done;
|
|
-
|
|
- sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
|
|
-
|
|
- if (sdev) {
|
|
- scsi_remove_device(sdev);
|
|
- scsi_device_put(sdev);
|
|
- }
|
|
- scsi_host_put(wrk->host);
|
|
-
|
|
-done:
|
|
- kfree(wrk);
|
|
-}
|
|
-
|
|
-/*
|
|
- * Major/minor macros. Minor version is in LSB, meaning that earlier flat
|
|
- * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
|
|
- */
|
|
-
|
|
-static inline u16 storvsc_get_version(u8 major, u8 minor)
|
|
-{
|
|
- u16 version;
|
|
-
|
|
- version = ((major << 8) | minor);
|
|
- return version;
|
|
-}
|
|
-
|
|
-/*
|
|
- * We can get incoming messages from the host that are not in response to
|
|
- * messages that we have sent out. An example of this would be messages
|
|
- * received by the guest to notify dynamic addition/removal of LUNs. To
|
|
- * deal with potential race conditions where the driver may be in the
|
|
- * midst of being unloaded when we might receive an unsolicited message
|
|
- * from the host, we have implemented a mechanism to gurantee sequential
|
|
- * consistency:
|
|
- *
|
|
- * 1) Once the device is marked as being destroyed, we will fail all
|
|
- * outgoing messages.
|
|
- * 2) We permit incoming messages when the device is being destroyed,
|
|
- * only to properly account for messages already sent out.
|
|
- */
|
|
-
|
|
-static inline struct storvsc_device *get_out_stor_device(
|
|
- struct hv_device *device)
|
|
-{
|
|
- struct storvsc_device *stor_device;
|
|
-
|
|
- stor_device = hv_get_drvdata(device);
|
|
-
|
|
- if (stor_device && stor_device->destroy)
|
|
- stor_device = NULL;
|
|
-
|
|
- return stor_device;
|
|
-}
|
|
-
|
|
-
|
|
-static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
|
|
-{
|
|
- dev->drain_notify = true;
|
|
- wait_event(dev->waiting_to_drain,
|
|
- atomic_read(&dev->num_outstanding_req) == 0);
|
|
- dev->drain_notify = false;
|
|
-}
|
|
-
|
|
-static inline struct storvsc_device *get_in_stor_device(
|
|
- struct hv_device *device)
|
|
-{
|
|
- struct storvsc_device *stor_device;
|
|
-
|
|
- stor_device = hv_get_drvdata(device);
|
|
-
|
|
- if (!stor_device)
|
|
- goto get_in_err;
|
|
-
|
|
- /*
|
|
- * If the device is being destroyed; allow incoming
|
|
- * traffic only to cleanup outstanding requests.
|
|
- */
|
|
-
|
|
- if (stor_device->destroy &&
|
|
- (atomic_read(&stor_device->num_outstanding_req) == 0))
|
|
- stor_device = NULL;
|
|
-
|
|
-get_in_err:
|
|
- return stor_device;
|
|
-
|
|
-}
|
|
-
|
|
-static void destroy_bounce_buffer(struct scatterlist *sgl,
|
|
- unsigned int sg_count)
|
|
-{
|
|
- int i;
|
|
- struct page *page_buf;
|
|
-
|
|
- for (i = 0; i < sg_count; i++) {
|
|
- page_buf = sg_page((&sgl[i]));
|
|
- if (page_buf != NULL)
|
|
- __free_page(page_buf);
|
|
- }
|
|
-
|
|
- kfree(sgl);
|
|
-}
|
|
-
|
|
-static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
|
|
-{
|
|
- int i;
|
|
-
|
|
- /* No need to check */
|
|
- if (sg_count < 2)
|
|
- return -1;
|
|
-
|
|
- /* We have at least 2 sg entries */
|
|
- for (i = 0; i < sg_count; i++) {
|
|
- if (i == 0) {
|
|
- /* make sure 1st one does not have hole */
|
|
- if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
|
|
- return i;
|
|
- } else if (i == sg_count - 1) {
|
|
- /* make sure last one does not have hole */
|
|
- if (sgl[i].offset != 0)
|
|
- return i;
|
|
- } else {
|
|
- /* make sure no hole in the middle */
|
|
- if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
|
|
- return i;
|
|
- }
|
|
- }
|
|
- return -1;
|
|
-}
|
|
-
|
|
-static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
|
|
- unsigned int sg_count,
|
|
- unsigned int len,
|
|
- int write)
|
|
-{
|
|
- int i;
|
|
- int num_pages;
|
|
- struct scatterlist *bounce_sgl;
|
|
- struct page *page_buf;
|
|
- unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
|
|
-
|
|
- num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
|
|
-
|
|
- bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
|
|
- if (!bounce_sgl)
|
|
- return NULL;
|
|
-
|
|
- for (i = 0; i < num_pages; i++) {
|
|
- page_buf = alloc_page(GFP_ATOMIC);
|
|
- if (!page_buf)
|
|
- goto cleanup;
|
|
- sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
|
|
- }
|
|
-
|
|
- return bounce_sgl;
|
|
-
|
|
-cleanup:
|
|
- destroy_bounce_buffer(bounce_sgl, num_pages);
|
|
- return NULL;
|
|
-}
|
|
-
|
|
-/* Assume the original sgl has enough room */
|
|
-static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
|
|
- struct scatterlist *bounce_sgl,
|
|
- unsigned int orig_sgl_count,
|
|
- unsigned int bounce_sgl_count)
|
|
-{
|
|
- int i;
|
|
- int j = 0;
|
|
- unsigned long src, dest;
|
|
- unsigned int srclen, destlen, copylen;
|
|
- unsigned int total_copied = 0;
|
|
- unsigned long bounce_addr = 0;
|
|
- unsigned long dest_addr = 0;
|
|
- unsigned long flags;
|
|
-
|
|
- local_irq_save(flags);
|
|
-
|
|
- for (i = 0; i < orig_sgl_count; i++) {
|
|
- dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
|
|
- KM_IRQ0) + orig_sgl[i].offset;
|
|
- dest = dest_addr;
|
|
- destlen = orig_sgl[i].length;
|
|
-
|
|
- if (bounce_addr == 0)
|
|
- bounce_addr =
|
|
- (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
|
|
- KM_IRQ0);
|
|
-
|
|
- while (destlen) {
|
|
- src = bounce_addr + bounce_sgl[j].offset;
|
|
- srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
|
|
-
|
|
- copylen = min(srclen, destlen);
|
|
- memcpy((void *)dest, (void *)src, copylen);
|
|
-
|
|
- total_copied += copylen;
|
|
- bounce_sgl[j].offset += copylen;
|
|
- destlen -= copylen;
|
|
- dest += copylen;
|
|
-
|
|
- if (bounce_sgl[j].offset == bounce_sgl[j].length) {
|
|
- /* full */
|
|
- kunmap_atomic((void *)bounce_addr, KM_IRQ0);
|
|
- j++;
|
|
-
|
|
- /*
|
|
- * It is possible that the number of elements
|
|
- * in the bounce buffer may not be equal to
|
|
- * the number of elements in the original
|
|
- * scatter list. Handle this correctly.
|
|
- */
|
|
-
|
|
- if (j == bounce_sgl_count) {
|
|
- /*
|
|
- * We are done; cleanup and return.
|
|
- */
|
|
- kunmap_atomic((void *)(dest_addr -
|
|
- orig_sgl[i].offset),
|
|
- KM_IRQ0);
|
|
- local_irq_restore(flags);
|
|
- return total_copied;
|
|
- }
|
|
-
|
|
- /* if we need to use another bounce buffer */
|
|
- if (destlen || i != orig_sgl_count - 1)
|
|
- bounce_addr =
|
|
- (unsigned long)kmap_atomic(
|
|
- sg_page((&bounce_sgl[j])), KM_IRQ0);
|
|
- } else if (destlen == 0 && i == orig_sgl_count - 1) {
|
|
- /* unmap the last bounce that is < PAGE_SIZE */
|
|
- kunmap_atomic((void *)bounce_addr, KM_IRQ0);
|
|
- }
|
|
- }
|
|
-
|
|
- kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset),
|
|
- KM_IRQ0);
|
|
- }
|
|
-
|
|
- local_irq_restore(flags);
|
|
-
|
|
- return total_copied;
|
|
-}
|
|
-
|
|
-/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
|
|
-static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
|
|
- struct scatterlist *bounce_sgl,
|
|
- unsigned int orig_sgl_count)
|
|
-{
|
|
- int i;
|
|
- int j = 0;
|
|
- unsigned long src, dest;
|
|
- unsigned int srclen, destlen, copylen;
|
|
- unsigned int total_copied = 0;
|
|
- unsigned long bounce_addr = 0;
|
|
- unsigned long src_addr = 0;
|
|
- unsigned long flags;
|
|
-
|
|
- local_irq_save(flags);
|
|
-
|
|
- for (i = 0; i < orig_sgl_count; i++) {
|
|
- src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
|
|
- KM_IRQ0) + orig_sgl[i].offset;
|
|
- src = src_addr;
|
|
- srclen = orig_sgl[i].length;
|
|
-
|
|
- if (bounce_addr == 0)
|
|
- bounce_addr =
|
|
- (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
|
|
- KM_IRQ0);
|
|
-
|
|
- while (srclen) {
|
|
- /* assume bounce offset always == 0 */
|
|
- dest = bounce_addr + bounce_sgl[j].length;
|
|
- destlen = PAGE_SIZE - bounce_sgl[j].length;
|
|
-
|
|
- copylen = min(srclen, destlen);
|
|
- memcpy((void *)dest, (void *)src, copylen);
|
|
-
|
|
- total_copied += copylen;
|
|
- bounce_sgl[j].length += copylen;
|
|
- srclen -= copylen;
|
|
- src += copylen;
|
|
-
|
|
- if (bounce_sgl[j].length == PAGE_SIZE) {
|
|
- /* full..move to next entry */
|
|
- kunmap_atomic((void *)bounce_addr, KM_IRQ0);
|
|
- j++;
|
|
-
|
|
- /* if we need to use another bounce buffer */
|
|
- if (srclen || i != orig_sgl_count - 1)
|
|
- bounce_addr =
|
|
- (unsigned long)kmap_atomic(
|
|
- sg_page((&bounce_sgl[j])), KM_IRQ0);
|
|
-
|
|
- } else if (srclen == 0 && i == orig_sgl_count - 1) {
|
|
- /* unmap the last bounce that is < PAGE_SIZE */
|
|
- kunmap_atomic((void *)bounce_addr, KM_IRQ0);
|
|
- }
|
|
- }
|
|
-
|
|
- kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0);
|
|
- }
|
|
-
|
|
- local_irq_restore(flags);
|
|
-
|
|
- return total_copied;
|
|
-}
|
|
-
|
|
-static int storvsc_channel_init(struct hv_device *device)
|
|
-{
|
|
- struct storvsc_device *stor_device;
|
|
- struct storvsc_cmd_request *request;
|
|
- struct vstor_packet *vstor_packet;
|
|
- int ret, t;
|
|
-
|
|
- stor_device = get_out_stor_device(device);
|
|
- if (!stor_device)
|
|
- return -ENODEV;
|
|
-
|
|
- request = &stor_device->init_request;
|
|
- vstor_packet = &request->vstor_packet;
|
|
-
|
|
- /*
|
|
- * Now, initiate the vsc/vsp initialization protocol on the open
|
|
- * channel
|
|
- */
|
|
- memset(request, 0, sizeof(struct storvsc_cmd_request));
|
|
- init_completion(&request->wait_event);
|
|
- vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
|
|
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
-
|
|
- ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
- sizeof(struct vstor_packet),
|
|
- (unsigned long)request,
|
|
- VM_PKT_DATA_INBAND,
|
|
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
- if (ret != 0)
|
|
- goto cleanup;
|
|
-
|
|
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
- if (t == 0) {
|
|
- ret = -ETIMEDOUT;
|
|
- goto cleanup;
|
|
- }
|
|
-
|
|
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
- vstor_packet->status != 0)
|
|
- goto cleanup;
|
|
-
|
|
-
|
|
- /* reuse the packet for version range supported */
|
|
- memset(vstor_packet, 0, sizeof(struct vstor_packet));
|
|
- vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
|
|
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
-
|
|
- vstor_packet->version.major_minor =
|
|
- storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR);
|
|
-
|
|
- /*
|
|
- * The revision number is only used in Windows; set it to 0.
|
|
- */
|
|
- vstor_packet->version.revision = 0;
|
|
-
|
|
- ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
- sizeof(struct vstor_packet),
|
|
- (unsigned long)request,
|
|
- VM_PKT_DATA_INBAND,
|
|
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
- if (ret != 0)
|
|
- goto cleanup;
|
|
-
|
|
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
- if (t == 0) {
|
|
- ret = -ETIMEDOUT;
|
|
- goto cleanup;
|
|
- }
|
|
-
|
|
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
- vstor_packet->status != 0)
|
|
- goto cleanup;
|
|
-
|
|
-
|
|
- memset(vstor_packet, 0, sizeof(struct vstor_packet));
|
|
- vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
|
|
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
- vstor_packet->storage_channel_properties.port_number =
|
|
- stor_device->port_number;
|
|
-
|
|
- ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
- sizeof(struct vstor_packet),
|
|
- (unsigned long)request,
|
|
- VM_PKT_DATA_INBAND,
|
|
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
-
|
|
- if (ret != 0)
|
|
- goto cleanup;
|
|
-
|
|
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
- if (t == 0) {
|
|
- ret = -ETIMEDOUT;
|
|
- goto cleanup;
|
|
- }
|
|
-
|
|
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
- vstor_packet->status != 0)
|
|
- goto cleanup;
|
|
-
|
|
- stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
|
|
- stor_device->target_id
|
|
- = vstor_packet->storage_channel_properties.target_id;
|
|
-
|
|
- memset(vstor_packet, 0, sizeof(struct vstor_packet));
|
|
- vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
|
|
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
-
|
|
- ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
- sizeof(struct vstor_packet),
|
|
- (unsigned long)request,
|
|
- VM_PKT_DATA_INBAND,
|
|
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
-
|
|
- if (ret != 0)
|
|
- goto cleanup;
|
|
-
|
|
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
- if (t == 0) {
|
|
- ret = -ETIMEDOUT;
|
|
- goto cleanup;
|
|
- }
|
|
-
|
|
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
- vstor_packet->status != 0)
|
|
- goto cleanup;
|
|
-
|
|
-
|
|
-cleanup:
|
|
- return ret;
|
|
-}
|
|
-
|
|
-
|
|
-static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
|
|
-{
|
|
- struct scsi_cmnd *scmnd = cmd_request->cmd;
|
|
- struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
|
|
- void (*scsi_done_fn)(struct scsi_cmnd *);
|
|
- struct scsi_sense_hdr sense_hdr;
|
|
- struct vmscsi_request *vm_srb;
|
|
- struct storvsc_scan_work *wrk;
|
|
- struct stor_mem_pools *memp = scmnd->device->hostdata;
|
|
-
|
|
- vm_srb = &cmd_request->vstor_packet.vm_srb;
|
|
- if (cmd_request->bounce_sgl_count) {
|
|
- if (vm_srb->data_in == READ_TYPE)
|
|
- copy_from_bounce_buffer(scsi_sglist(scmnd),
|
|
- cmd_request->bounce_sgl,
|
|
- scsi_sg_count(scmnd),
|
|
- cmd_request->bounce_sgl_count);
|
|
- destroy_bounce_buffer(cmd_request->bounce_sgl,
|
|
- cmd_request->bounce_sgl_count);
|
|
- }
|
|
-
|
|
- /*
|
|
- * If there is an error; offline the device since all
|
|
- * error recovery strategies would have already been
|
|
- * deployed on the host side.
|
|
- */
|
|
- if (vm_srb->srb_status == SRB_STATUS_ERROR)
|
|
- scmnd->result = DID_TARGET_FAILURE << 16;
|
|
- else
|
|
- scmnd->result = vm_srb->scsi_status;
|
|
-
|
|
- /*
|
|
- * If the LUN is invalid; remove the device.
|
|
- */
|
|
- if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) {
|
|
- struct storvsc_device *stor_dev;
|
|
- struct hv_device *dev = host_dev->dev;
|
|
- struct Scsi_Host *host;
|
|
-
|
|
- stor_dev = get_in_stor_device(dev);
|
|
- host = stor_dev->host;
|
|
-
|
|
- wrk = kmalloc(sizeof(struct storvsc_scan_work),
|
|
- GFP_ATOMIC);
|
|
- if (!wrk) {
|
|
- scmnd->result = DID_TARGET_FAILURE << 16;
|
|
- } else {
|
|
- wrk->host = host;
|
|
- wrk->lun = vm_srb->lun;
|
|
- INIT_WORK(&wrk->work, storvsc_remove_lun);
|
|
- schedule_work(&wrk->work);
|
|
- }
|
|
- }
|
|
-
|
|
- if (scmnd->result) {
|
|
- if (scsi_normalize_sense(scmnd->sense_buffer,
|
|
- SCSI_SENSE_BUFFERSIZE, &sense_hdr))
|
|
- scsi_print_sense_hdr("storvsc", &sense_hdr);
|
|
- }
|
|
-
|
|
- scsi_set_resid(scmnd,
|
|
- cmd_request->data_buffer.len -
|
|
- vm_srb->data_transfer_length);
|
|
-
|
|
- scsi_done_fn = scmnd->scsi_done;
|
|
-
|
|
- scmnd->host_scribble = NULL;
|
|
- scmnd->scsi_done = NULL;
|
|
-
|
|
- scsi_done_fn(scmnd);
|
|
-
|
|
- mempool_free(cmd_request, memp->request_mempool);
|
|
-}
|
|
-
|
|
-static void storvsc_on_io_completion(struct hv_device *device,
|
|
- struct vstor_packet *vstor_packet,
|
|
- struct storvsc_cmd_request *request)
|
|
-{
|
|
- struct storvsc_device *stor_device;
|
|
- struct vstor_packet *stor_pkt;
|
|
-
|
|
- stor_device = hv_get_drvdata(device);
|
|
- stor_pkt = &request->vstor_packet;
|
|
-
|
|
- /*
|
|
- * The current SCSI handling on the host side does
|
|
- * not correctly handle:
|
|
- * INQUIRY command with page code parameter set to 0x80
|
|
- * MODE_SENSE command with cmd[2] == 0x1c
|
|
- *
|
|
- * Setup srb and scsi status so this won't be fatal.
|
|
- * We do this so we can distinguish truly fatal failues
|
|
- * (srb status == 0x4) and off-line the device in that case.
|
|
- */
|
|
-
|
|
- if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
|
|
- (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
|
|
- vstor_packet->vm_srb.scsi_status = 0;
|
|
- vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
|
|
- }
|
|
-
|
|
-
|
|
- /* Copy over the status...etc */
|
|
- stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
|
|
- stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
|
|
- stor_pkt->vm_srb.sense_info_length =
|
|
- vstor_packet->vm_srb.sense_info_length;
|
|
-
|
|
- if (vstor_packet->vm_srb.scsi_status != 0 ||
|
|
- vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
|
|
- dev_warn(&device->device,
|
|
- "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
|
|
- stor_pkt->vm_srb.cdb[0],
|
|
- vstor_packet->vm_srb.scsi_status,
|
|
- vstor_packet->vm_srb.srb_status);
|
|
- }
|
|
-
|
|
- if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
|
|
- /* CHECK_CONDITION */
|
|
- if (vstor_packet->vm_srb.srb_status &
|
|
- SRB_STATUS_AUTOSENSE_VALID) {
|
|
- /* autosense data available */
|
|
- dev_warn(&device->device,
|
|
- "stor pkt %p autosense data valid - len %d\n",
|
|
- request,
|
|
- vstor_packet->vm_srb.sense_info_length);
|
|
-
|
|
- memcpy(request->sense_buffer,
|
|
- vstor_packet->vm_srb.sense_data,
|
|
- vstor_packet->vm_srb.sense_info_length);
|
|
-
|
|
- }
|
|
- }
|
|
-
|
|
- stor_pkt->vm_srb.data_transfer_length =
|
|
- vstor_packet->vm_srb.data_transfer_length;
|
|
-
|
|
- storvsc_command_completion(request);
|
|
-
|
|
- if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
|
|
- stor_device->drain_notify)
|
|
- wake_up(&stor_device->waiting_to_drain);
|
|
-
|
|
-
|
|
-}
|
|
-
|
|
-static void storvsc_on_receive(struct hv_device *device,
|
|
- struct vstor_packet *vstor_packet,
|
|
- struct storvsc_cmd_request *request)
|
|
-{
|
|
- struct storvsc_scan_work *work;
|
|
- struct storvsc_device *stor_device;
|
|
-
|
|
- switch (vstor_packet->operation) {
|
|
- case VSTOR_OPERATION_COMPLETE_IO:
|
|
- storvsc_on_io_completion(device, vstor_packet, request);
|
|
- break;
|
|
-
|
|
- case VSTOR_OPERATION_REMOVE_DEVICE:
|
|
- case VSTOR_OPERATION_ENUMERATE_BUS:
|
|
- stor_device = get_in_stor_device(device);
|
|
- work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
|
|
- if (!work)
|
|
- return;
|
|
-
|
|
- INIT_WORK(&work->work, storvsc_bus_scan);
|
|
- work->host = stor_device->host;
|
|
- schedule_work(&work->work);
|
|
- break;
|
|
-
|
|
- default:
|
|
- break;
|
|
- }
|
|
-}
|
|
-
|
|
-static void storvsc_on_channel_callback(void *context)
|
|
-{
|
|
- struct hv_device *device = (struct hv_device *)context;
|
|
- struct storvsc_device *stor_device;
|
|
- u32 bytes_recvd;
|
|
- u64 request_id;
|
|
- unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
|
|
- struct storvsc_cmd_request *request;
|
|
- int ret;
|
|
-
|
|
-
|
|
- stor_device = get_in_stor_device(device);
|
|
- if (!stor_device)
|
|
- return;
|
|
-
|
|
- do {
|
|
- ret = vmbus_recvpacket(device->channel, packet,
|
|
- ALIGN(sizeof(struct vstor_packet), 8),
|
|
- &bytes_recvd, &request_id);
|
|
- if (ret == 0 && bytes_recvd > 0) {
|
|
-
|
|
- request = (struct storvsc_cmd_request *)
|
|
- (unsigned long)request_id;
|
|
-
|
|
- if ((request == &stor_device->init_request) ||
|
|
- (request == &stor_device->reset_request)) {
|
|
-
|
|
- memcpy(&request->vstor_packet, packet,
|
|
- sizeof(struct vstor_packet));
|
|
- complete(&request->wait_event);
|
|
- } else {
|
|
- storvsc_on_receive(device,
|
|
- (struct vstor_packet *)packet,
|
|
- request);
|
|
- }
|
|
- } else {
|
|
- break;
|
|
- }
|
|
- } while (1);
|
|
-
|
|
- return;
|
|
-}
|
|
-
|
|
-static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
|
|
-{
|
|
- struct vmstorage_channel_properties props;
|
|
- int ret;
|
|
-
|
|
- memset(&props, 0, sizeof(struct vmstorage_channel_properties));
|
|
-
|
|
- ret = vmbus_open(device->channel,
|
|
- ring_size,
|
|
- ring_size,
|
|
- (void *)&props,
|
|
- sizeof(struct vmstorage_channel_properties),
|
|
- storvsc_on_channel_callback, device);
|
|
-
|
|
- if (ret != 0)
|
|
- return ret;
|
|
-
|
|
- ret = storvsc_channel_init(device);
|
|
-
|
|
- return ret;
|
|
-}
|
|
-
|
|
-static int storvsc_dev_remove(struct hv_device *device)
|
|
-{
|
|
- struct storvsc_device *stor_device;
|
|
- unsigned long flags;
|
|
-
|
|
- stor_device = hv_get_drvdata(device);
|
|
-
|
|
- spin_lock_irqsave(&device->channel->inbound_lock, flags);
|
|
- stor_device->destroy = true;
|
|
- spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
|
|
-
|
|
- /*
|
|
- * At this point, all outbound traffic should be disable. We
|
|
- * only allow inbound traffic (responses) to proceed so that
|
|
- * outstanding requests can be completed.
|
|
- */
|
|
-
|
|
- storvsc_wait_to_drain(stor_device);
|
|
-
|
|
- /*
|
|
- * Since we have already drained, we don't need to busy wait
|
|
- * as was done in final_release_stor_device()
|
|
- * Note that we cannot set the ext pointer to NULL until
|
|
- * we have drained - to drain the outgoing packets, we need to
|
|
- * allow incoming packets.
|
|
- */
|
|
- spin_lock_irqsave(&device->channel->inbound_lock, flags);
|
|
- hv_set_drvdata(device, NULL);
|
|
- spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
|
|
-
|
|
- /* Close the channel */
|
|
- vmbus_close(device->channel);
|
|
-
|
|
- kfree(stor_device);
|
|
- return 0;
|
|
-}
|
|
-
|
|
-static int storvsc_do_io(struct hv_device *device,
|
|
- struct storvsc_cmd_request *request)
|
|
-{
|
|
- struct storvsc_device *stor_device;
|
|
- struct vstor_packet *vstor_packet;
|
|
- int ret = 0;
|
|
-
|
|
- vstor_packet = &request->vstor_packet;
|
|
- stor_device = get_out_stor_device(device);
|
|
-
|
|
- if (!stor_device)
|
|
- return -ENODEV;
|
|
-
|
|
-
|
|
- request->device = device;
|
|
-
|
|
-
|
|
- vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
|
|
-
|
|
- vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
|
|
-
|
|
-
|
|
- vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE;
|
|
-
|
|
-
|
|
- vstor_packet->vm_srb.data_transfer_length =
|
|
- request->data_buffer.len;
|
|
-
|
|
- vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
|
|
-
|
|
- if (request->data_buffer.len) {
|
|
- ret = vmbus_sendpacket_multipagebuffer(device->channel,
|
|
- &request->data_buffer,
|
|
- vstor_packet,
|
|
- sizeof(struct vstor_packet),
|
|
- (unsigned long)request);
|
|
- } else {
|
|
- ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
- sizeof(struct vstor_packet),
|
|
- (unsigned long)request,
|
|
- VM_PKT_DATA_INBAND,
|
|
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
- }
|
|
-
|
|
- if (ret != 0)
|
|
- return ret;
|
|
-
|
|
- atomic_inc(&stor_device->num_outstanding_req);
|
|
-
|
|
- return ret;
|
|
-}
|
|
-
|
|
-static int storvsc_device_alloc(struct scsi_device *sdevice)
|
|
-{
|
|
- struct stor_mem_pools *memp;
|
|
- int number = STORVSC_MIN_BUF_NR;
|
|
-
|
|
- memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
|
|
- if (!memp)
|
|
- return -ENOMEM;
|
|
-
|
|
- memp->request_pool =
|
|
- kmem_cache_create(dev_name(&sdevice->sdev_dev),
|
|
- sizeof(struct storvsc_cmd_request), 0,
|
|
- SLAB_HWCACHE_ALIGN, NULL);
|
|
-
|
|
- if (!memp->request_pool)
|
|
- goto err0;
|
|
-
|
|
- memp->request_mempool = mempool_create(number, mempool_alloc_slab,
|
|
- mempool_free_slab,
|
|
- memp->request_pool);
|
|
-
|
|
- if (!memp->request_mempool)
|
|
- goto err1;
|
|
-
|
|
- sdevice->hostdata = memp;
|
|
-
|
|
- return 0;
|
|
-
|
|
-err1:
|
|
- kmem_cache_destroy(memp->request_pool);
|
|
-
|
|
-err0:
|
|
- kfree(memp);
|
|
- return -ENOMEM;
|
|
-}
|
|
-
|
|
-static void storvsc_device_destroy(struct scsi_device *sdevice)
|
|
-{
|
|
- struct stor_mem_pools *memp = sdevice->hostdata;
|
|
-
|
|
- mempool_destroy(memp->request_mempool);
|
|
- kmem_cache_destroy(memp->request_pool);
|
|
- kfree(memp);
|
|
- sdevice->hostdata = NULL;
|
|
-}
|
|
-
|
|
-static int storvsc_device_configure(struct scsi_device *sdevice)
|
|
-{
|
|
- scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
|
|
- STORVSC_MAX_IO_REQUESTS);
|
|
-
|
|
- blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
|
|
-
|
|
- blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
|
|
-
|
|
- return 0;
|
|
-}
|
|
-
|
|
-static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
|
|
- sector_t capacity, int *info)
|
|
-{
|
|
- sector_t nsect = capacity;
|
|
- sector_t cylinders = nsect;
|
|
- int heads, sectors_pt;
|
|
-
|
|
- /*
|
|
- * We are making up these values; let us keep it simple.
|
|
- */
|
|
- heads = 0xff;
|
|
- sectors_pt = 0x3f; /* Sectors per track */
|
|
- sector_div(cylinders, heads * sectors_pt);
|
|
- if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
|
|
- cylinders = 0xffff;
|
|
-
|
|
- info[0] = heads;
|
|
- info[1] = sectors_pt;
|
|
- info[2] = (int)cylinders;
|
|
-
|
|
- return 0;
|
|
-}
|
|
-
|
|
-static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
|
|
-{
|
|
- struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
|
|
- struct hv_device *device = host_dev->dev;
|
|
-
|
|
- struct storvsc_device *stor_device;
|
|
- struct storvsc_cmd_request *request;
|
|
- struct vstor_packet *vstor_packet;
|
|
- int ret, t;
|
|
-
|
|
-
|
|
- stor_device = get_out_stor_device(device);
|
|
- if (!stor_device)
|
|
- return FAILED;
|
|
-
|
|
- request = &stor_device->reset_request;
|
|
- vstor_packet = &request->vstor_packet;
|
|
-
|
|
- init_completion(&request->wait_event);
|
|
-
|
|
- vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
|
|
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
|
|
- vstor_packet->vm_srb.path_id = stor_device->path_id;
|
|
-
|
|
- ret = vmbus_sendpacket(device->channel, vstor_packet,
|
|
- sizeof(struct vstor_packet),
|
|
- (unsigned long)&stor_device->reset_request,
|
|
- VM_PKT_DATA_INBAND,
|
|
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
- if (ret != 0)
|
|
- return FAILED;
|
|
-
|
|
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
- if (t == 0)
|
|
- return TIMEOUT_ERROR;
|
|
-
|
|
-
|
|
- /*
|
|
- * At this point, all outstanding requests in the adapter
|
|
- * should have been flushed out and return to us
|
|
- * There is a potential race here where the host may be in
|
|
- * the process of responding when we return from here.
|
|
- * Just wait for all in-transit packets to be accounted for
|
|
- * before we return from here.
|
|
- */
|
|
- storvsc_wait_to_drain(stor_device);
|
|
-
|
|
- return SUCCESS;
|
|
-}
|
|
-
|
|
-static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
|
|
-{
|
|
- bool allowed = true;
|
|
- u8 scsi_op = scmnd->cmnd[0];
|
|
-
|
|
- switch (scsi_op) {
|
|
- /*
|
|
- * smartd sends this command and the host does not handle
|
|
- * this. So, don't send it.
|
|
- */
|
|
- case SET_WINDOW:
|
|
- scmnd->result = ILLEGAL_REQUEST << 16;
|
|
- allowed = false;
|
|
- break;
|
|
- default:
|
|
- break;
|
|
- }
|
|
- return allowed;
|
|
-}
|
|
-
|
|
-static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
|
|
-{
|
|
- int ret;
|
|
- struct hv_host_device *host_dev = shost_priv(host);
|
|
- struct hv_device *dev = host_dev->dev;
|
|
- struct storvsc_cmd_request *cmd_request;
|
|
- unsigned int request_size = 0;
|
|
- int i;
|
|
- struct scatterlist *sgl;
|
|
- unsigned int sg_count = 0;
|
|
- struct vmscsi_request *vm_srb;
|
|
- struct stor_mem_pools *memp = scmnd->device->hostdata;
|
|
-
|
|
- if (!storvsc_scsi_cmd_ok(scmnd)) {
|
|
- scmnd->scsi_done(scmnd);
|
|
- return 0;
|
|
- }
|
|
-
|
|
- request_size = sizeof(struct storvsc_cmd_request);
|
|
-
|
|
- cmd_request = mempool_alloc(memp->request_mempool,
|
|
- GFP_ATOMIC);
|
|
-
|
|
- /*
|
|
- * We might be invoked in an interrupt context; hence
|
|
- * mempool_alloc() can fail.
|
|
- */
|
|
- if (!cmd_request)
|
|
- return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
-
|
|
- memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
|
|
-
|
|
- /* Setup the cmd request */
|
|
- cmd_request->cmd = scmnd;
|
|
-
|
|
- scmnd->host_scribble = (unsigned char *)cmd_request;
|
|
-
|
|
- vm_srb = &cmd_request->vstor_packet.vm_srb;
|
|
-
|
|
-
|
|
- /* Build the SRB */
|
|
- switch (scmnd->sc_data_direction) {
|
|
- case DMA_TO_DEVICE:
|
|
- vm_srb->data_in = WRITE_TYPE;
|
|
- break;
|
|
- case DMA_FROM_DEVICE:
|
|
- vm_srb->data_in = READ_TYPE;
|
|
- break;
|
|
- default:
|
|
- vm_srb->data_in = UNKNOWN_TYPE;
|
|
- break;
|
|
- }
|
|
-
|
|
-
|
|
- vm_srb->port_number = host_dev->port;
|
|
- vm_srb->path_id = scmnd->device->channel;
|
|
- vm_srb->target_id = scmnd->device->id;
|
|
- vm_srb->lun = scmnd->device->lun;
|
|
-
|
|
- vm_srb->cdb_length = scmnd->cmd_len;
|
|
-
|
|
- memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
|
|
-
|
|
- cmd_request->sense_buffer = scmnd->sense_buffer;
|
|
-
|
|
-
|
|
- cmd_request->data_buffer.len = scsi_bufflen(scmnd);
|
|
- if (scsi_sg_count(scmnd)) {
|
|
- sgl = (struct scatterlist *)scsi_sglist(scmnd);
|
|
- sg_count = scsi_sg_count(scmnd);
|
|
-
|
|
- /* check if we need to bounce the sgl */
|
|
- if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
|
|
- cmd_request->bounce_sgl =
|
|
- create_bounce_buffer(sgl, scsi_sg_count(scmnd),
|
|
- scsi_bufflen(scmnd),
|
|
- vm_srb->data_in);
|
|
- if (!cmd_request->bounce_sgl) {
|
|
- ret = SCSI_MLQUEUE_HOST_BUSY;
|
|
- goto queue_error;
|
|
- }
|
|
-
|
|
- cmd_request->bounce_sgl_count =
|
|
- ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
|
|
- PAGE_SHIFT;
|
|
-
|
|
- if (vm_srb->data_in == WRITE_TYPE)
|
|
- copy_to_bounce_buffer(sgl,
|
|
- cmd_request->bounce_sgl,
|
|
- scsi_sg_count(scmnd));
|
|
-
|
|
- sgl = cmd_request->bounce_sgl;
|
|
- sg_count = cmd_request->bounce_sgl_count;
|
|
- }
|
|
-
|
|
- cmd_request->data_buffer.offset = sgl[0].offset;
|
|
-
|
|
- for (i = 0; i < sg_count; i++)
|
|
- cmd_request->data_buffer.pfn_array[i] =
|
|
- page_to_pfn(sg_page((&sgl[i])));
|
|
-
|
|
- } else if (scsi_sglist(scmnd)) {
|
|
- cmd_request->data_buffer.offset =
|
|
- virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
|
|
- cmd_request->data_buffer.pfn_array[0] =
|
|
- virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
|
|
- }
|
|
-
|
|
- /* Invokes the vsc to start an IO */
|
|
- ret = storvsc_do_io(dev, cmd_request);
|
|
-
|
|
- if (ret == -EAGAIN) {
|
|
- /* no more space */
|
|
-
|
|
- if (cmd_request->bounce_sgl_count) {
|
|
- destroy_bounce_buffer(cmd_request->bounce_sgl,
|
|
- cmd_request->bounce_sgl_count);
|
|
-
|
|
- ret = SCSI_MLQUEUE_DEVICE_BUSY;
|
|
- goto queue_error;
|
|
- }
|
|
- }
|
|
-
|
|
- return 0;
|
|
-
|
|
-queue_error:
|
|
- mempool_free(cmd_request, memp->request_mempool);
|
|
- scmnd->host_scribble = NULL;
|
|
- return ret;
|
|
-}
|
|
-
|
|
-static struct scsi_host_template scsi_driver = {
|
|
- .module = THIS_MODULE,
|
|
- .name = "storvsc_host_t",
|
|
- .bios_param = storvsc_get_chs,
|
|
- .queuecommand = storvsc_queuecommand,
|
|
- .eh_host_reset_handler = storvsc_host_reset_handler,
|
|
- .slave_alloc = storvsc_device_alloc,
|
|
- .slave_destroy = storvsc_device_destroy,
|
|
- .slave_configure = storvsc_device_configure,
|
|
- .cmd_per_lun = 1,
|
|
- /* 64 max_queue * 1 target */
|
|
- .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
|
|
- .this_id = -1,
|
|
- /* no use setting to 0 since ll_blk_rw reset it to 1 */
|
|
- /* currently 32 */
|
|
- .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
|
|
- .use_clustering = DISABLE_CLUSTERING,
|
|
- /* Make sure we dont get a sg segment crosses a page boundary */
|
|
- .dma_boundary = PAGE_SIZE-1,
|
|
-};
|
|
-
|
|
-enum {
|
|
- SCSI_GUID,
|
|
- IDE_GUID,
|
|
-};
|
|
-
|
|
-static const struct hv_vmbus_device_id id_table[] = {
|
|
- /* SCSI guid */
|
|
- { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
|
|
- 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
|
|
- .driver_data = SCSI_GUID },
|
|
- /* IDE guid */
|
|
- { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
|
|
- 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
|
|
- .driver_data = IDE_GUID },
|
|
- { },
|
|
-};
|
|
-
|
|
-MODULE_DEVICE_TABLE(vmbus, id_table);
|
|
-
|
|
-static int storvsc_probe(struct hv_device *device,
|
|
- const struct hv_vmbus_device_id *dev_id)
|
|
-{
|
|
- int ret;
|
|
- struct Scsi_Host *host;
|
|
- struct hv_host_device *host_dev;
|
|
- bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
|
|
- int target = 0;
|
|
- struct storvsc_device *stor_device;
|
|
-
|
|
- host = scsi_host_alloc(&scsi_driver,
|
|
- sizeof(struct hv_host_device));
|
|
- if (!host)
|
|
- return -ENOMEM;
|
|
-
|
|
- host_dev = shost_priv(host);
|
|
- memset(host_dev, 0, sizeof(struct hv_host_device));
|
|
-
|
|
- host_dev->port = host->host_no;
|
|
- host_dev->dev = device;
|
|
-
|
|
-
|
|
- stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
|
|
- if (!stor_device) {
|
|
- ret = -ENOMEM;
|
|
- goto err_out0;
|
|
- }
|
|
-
|
|
- stor_device->destroy = false;
|
|
- init_waitqueue_head(&stor_device->waiting_to_drain);
|
|
- stor_device->device = device;
|
|
- stor_device->host = host;
|
|
- hv_set_drvdata(device, stor_device);
|
|
-
|
|
- stor_device->port_number = host->host_no;
|
|
- ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
|
|
- if (ret)
|
|
- goto err_out1;
|
|
-
|
|
- host_dev->path = stor_device->path_id;
|
|
- host_dev->target = stor_device->target_id;
|
|
-
|
|
- /* max # of devices per target */
|
|
- host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
|
|
- /* max # of targets per channel */
|
|
- host->max_id = STORVSC_MAX_TARGETS;
|
|
- /* max # of channels */
|
|
- host->max_channel = STORVSC_MAX_CHANNELS - 1;
|
|
- /* max cmd length */
|
|
- host->max_cmd_len = STORVSC_MAX_CMD_LEN;
|
|
-
|
|
- /* Register the HBA and start the scsi bus scan */
|
|
- ret = scsi_add_host(host, &device->device);
|
|
- if (ret != 0)
|
|
- goto err_out2;
|
|
-
|
|
- if (!dev_is_ide) {
|
|
- scsi_scan_host(host);
|
|
- } else {
|
|
- target = (device->dev_instance.b[5] << 8 |
|
|
- device->dev_instance.b[4]);
|
|
- ret = scsi_add_device(host, 0, target, 0);
|
|
- if (ret) {
|
|
- scsi_remove_host(host);
|
|
- goto err_out2;
|
|
- }
|
|
- }
|
|
- return 0;
|
|
-
|
|
-err_out2:
|
|
- /*
|
|
- * Once we have connected with the host, we would need to
|
|
- * to invoke storvsc_dev_remove() to rollback this state and
|
|
- * this call also frees up the stor_device; hence the jump around
|
|
- * err_out1 label.
|
|
- */
|
|
- storvsc_dev_remove(device);
|
|
- goto err_out0;
|
|
-
|
|
-err_out1:
|
|
- kfree(stor_device);
|
|
-
|
|
-err_out0:
|
|
- scsi_host_put(host);
|
|
- return ret;
|
|
-}
|
|
-
|
|
-static int storvsc_remove(struct hv_device *dev)
|
|
-{
|
|
- struct storvsc_device *stor_device = hv_get_drvdata(dev);
|
|
- struct Scsi_Host *host = stor_device->host;
|
|
-
|
|
- scsi_remove_host(host);
|
|
- storvsc_dev_remove(dev);
|
|
- scsi_host_put(host);
|
|
-
|
|
- return 0;
|
|
-}
|
|
-
|
|
-static struct hv_driver storvsc_drv = {
|
|
- .name = KBUILD_MODNAME,
|
|
- .id_table = id_table,
|
|
- .probe = storvsc_probe,
|
|
- .remove = storvsc_remove,
|
|
-};
|
|
-
|
|
-static int __init storvsc_drv_init(void)
|
|
-{
|
|
- u32 max_outstanding_req_per_channel;
|
|
-
|
|
- /*
|
|
- * 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_multipage_buffer + struct vstor_packet + u64)
|
|
- */
|
|
- max_outstanding_req_per_channel =
|
|
- ((storvsc_ringbuffer_size - PAGE_SIZE) /
|
|
- ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
|
|
- sizeof(struct vstor_packet) + sizeof(u64),
|
|
- sizeof(u64)));
|
|
-
|
|
- if (max_outstanding_req_per_channel <
|
|
- STORVSC_MAX_IO_REQUESTS)
|
|
- return -EINVAL;
|
|
-
|
|
- return vmbus_driver_register(&storvsc_drv);
|
|
-}
|
|
-
|
|
-static void __exit storvsc_drv_exit(void)
|
|
-{
|
|
- vmbus_driver_unregister(&storvsc_drv);
|
|
-}
|
|
-
|
|
-MODULE_LICENSE("GPL");
|
|
-MODULE_VERSION(HV_DRV_VERSION);
|
|
-MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
|
|
-module_init(storvsc_drv_init);
|
|
-module_exit(storvsc_drv_exit);
|