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Subject[PATCH 101/117] Staging: hv: storvsc: Include storvsc.c in storvsc_drv.c
Date
As part of further cleanup of our storage drivers, include the content
of storvsc.c into storvsc_drv.c.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
drivers/staging/hv/Makefile | 2 +-
drivers/staging/hv/storvsc.c | 526 -------------------------------------
drivers/staging/hv/storvsc_drv.c | 527 ++++++++++++++++++++++++++++++++++++++
3 files changed, 528 insertions(+), 527 deletions(-)
delete mode 100644 drivers/staging/hv/storvsc.c
diff --git a/drivers/staging/hv/Makefile b/drivers/staging/hv/Makefile
index bb89437..bd176b1 100644
--- a/drivers/staging/hv/Makefile
+++ b/drivers/staging/hv/Makefile
@@ -7,6 +7,6 @@ obj-$(CONFIG_HYPERV_MOUSE) += hv_mouse.o
hv_vmbus-y := vmbus_drv.o \
hv.o connection.o channel.o \
channel_mgmt.o ring_buffer.o
-hv_storvsc-y := storvsc_drv.o storvsc.o
+hv_storvsc-y := storvsc_drv.o
hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
hv_utils-y := hv_util.o hv_kvp.o
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
deleted file mode 100644
index 4d13044..0000000
--- a/drivers/staging/hv/storvsc.c
+++ /dev/null
@@ -1,526 +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/sched.h>
-#include <linux/completion.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/delay.h>
-
-#include "hyperv.h"
-#include "hyperv_storage.h"
-
-
-static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)
-{
- struct storvsc_device *stor_device;
-
- stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
- if (!stor_device)
- return NULL;
-
- stor_device->ref_count = 1;
- stor_device->destroy = false;
- init_waitqueue_head(&stor_device->waiting_to_drain);
- stor_device->device = device;
- device->ext = stor_device;
-
- return stor_device;
-}
-
-static inline struct storvsc_device *get_in_stor_device(
- struct hv_device *device)
-{
- struct storvsc_device *stor_device;
- unsigned long flags;
-
- spin_lock_irqsave(&device->ext_lock, flags);
- stor_device = (struct storvsc_device *)device->ext;
- if (!stor_device)
- goto cleanup;
-
- /*
- * 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))
- goto cleanup;
- stor_device->ref_count++;
-cleanup:
- spin_unlock_irqrestore(&device->ext_lock, flags);
-
- return stor_device;
-}
-
-static int storvsc_channel_init(struct hv_device *device)
-{
- struct storvsc_device *stor_device;
- struct hv_storvsc_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 hv_storvsc_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 = VMSTOR_PROTOCOL_VERSION_CURRENT;
- FILL_VMSTOR_REVISION(vstor_packet->version.revision);
-
- 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:
- put_stor_device(device);
- return ret;
-}
-
-static void storvsc_on_io_completion(struct hv_device *device,
- struct vstor_packet *vstor_packet,
- struct hv_storvsc_request *request)
-{
- struct storvsc_device *stor_device;
- struct vstor_packet *stor_pkt;
-
- stor_device = (struct storvsc_device *)device->ext;
-
- stor_pkt = &request->vstor_packet;
-
-
- /* 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 != 1){
- DPRINT_WARN(STORVSC,
- "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 & 0x80) {
- /* autosense data available */
- DPRINT_WARN(STORVSC, "storvsc 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;
-
- request->on_io_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 hv_storvsc_request *request)
-{
- switch (vstor_packet->operation) {
- case VSTOR_OPERATION_COMPLETE_IO:
- storvsc_on_io_completion(device, vstor_packet, request);
- break;
- case VSTOR_OPERATION_REMOVE_DEVICE:
-
- 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 hv_storvsc_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 hv_storvsc_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);
-
- put_stor_device(device);
- 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));
-
- /* Open the channel */
- 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;
-}
-
-int storvsc_dev_add(struct hv_device *device,
- void *additional_info)
-{
- struct storvsc_device *stor_device;
- struct storvsc_device_info *device_info;
- int ret = 0;
-
- device_info = (struct storvsc_device_info *)additional_info;
- stor_device = alloc_stor_device(device);
- if (!stor_device)
- return -ENOMEM;
-
- /* Save the channel properties to our storvsc channel */
-
- /*
- * If we support more than 1 scsi channel, we need to set the
- * port number here to the scsi channel but how do we get the
- * scsi channel prior to the bus scan.
- *
- * The host does not support this.
- */
-
- stor_device->port_number = device_info->port_number;
- /* Send it back up */
- ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size);
- if (ret) {
- kfree(stor_device);
- return ret;
- }
- device_info->path_id = stor_device->path_id;
- device_info->target_id = stor_device->target_id;
-
- return ret;
-}
-
-int storvsc_dev_remove(struct hv_device *device)
-{
- struct storvsc_device *stor_device;
- unsigned long flags;
-
- /*
- * Since we currently hold a reference on the stor
- * device, it is safe to dereference the ext
- * pointer.
- */
- stor_device = (struct storvsc_device *)device->ext;
-
- stor_device->destroy = true;
-
- /*
- * 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);
-
- spin_lock_irqsave(&device->ext_lock, flags);
- stor_device->ref_count = 0;
- device->ext = NULL;
- spin_unlock_irqrestore(&device->ext_lock, flags);
-
- /* Close the channel */
- vmbus_close(device->channel);
-
- kfree(stor_device);
- return 0;
-}
-
-int storvsc_do_io(struct hv_device *device,
- struct hv_storvsc_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 = 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);
-
- put_stor_device(device);
- return ret;
-}
-
-/*
- * The channel properties uniquely specify how the device is to be
- * presented to the guest. Map this information for use by the block
- * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest
- * (storvsc_drv) and so scsi devices in the guest are handled by
- * native upper level Linux drivers. Consequently, Hyper-V
- * block driver, while being a generic block driver, presently does not
- * deal with anything other than devices that would need to be presented
- * to the guest as an IDE disk.
- *
- * This function maps the channel properties as embedded in the input
- * parameter device_info onto information necessary to register the
- * corresponding block device.
- *
- * Currently, there is no way to stop the emulation of the block device
- * on the host side. And so, to prevent the native IDE drivers in Linux
- * from taking over these devices (to be managedby Hyper-V block
- * driver), we will take over if need be the major of the IDE controllers.
- *
- */
-
-int storvsc_get_major_info(struct storvsc_device_info *device_info,
- struct storvsc_major_info *major_info)
-{
- static bool ide0_registered;
- static bool ide1_registered;
-
- /*
- * For now we only support IDE disks.
- */
- major_info->devname = "ide";
- major_info->diskname = "hd";
-
- if (device_info->path_id) {
- major_info->major = 22;
- if (!ide1_registered) {
- major_info->do_register = true;
- ide1_registered = true;
- } else
- major_info->do_register = false;
-
- if (device_info->target_id)
- major_info->index = 3;
- else
- major_info->index = 2;
-
- return 0;
- } else {
- major_info->major = 3;
- if (!ide0_registered) {
- major_info->do_register = true;
- ide0_registered = true;
- } else
- major_info->do_register = false;
-
- if (device_info->target_id)
- major_info->index = 1;
- else
- major_info->index = 0;
-
- return 0;
- }
-
- return -ENODEV;
-}
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 6e4725f..3ce43a3 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -36,6 +36,533 @@
#include "hyperv.h"
#include "hyperv_storage.h"

+
+/*
+ * 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/sched.h>
+#include <linux/completion.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+
+#include "hyperv.h"
+#include "hyperv_storage.h"
+
+
+static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+
+ stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
+ if (!stor_device)
+ return NULL;
+
+ stor_device->ref_count = 1;
+ stor_device->destroy = false;
+ init_waitqueue_head(&stor_device->waiting_to_drain);
+ stor_device->device = device;
+ device->ext = stor_device;
+
+ return stor_device;
+}
+
+static inline struct storvsc_device *get_in_stor_device(
+ struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ unsigned long flags;
+
+ spin_lock_irqsave(&device->ext_lock, flags);
+ stor_device = (struct storvsc_device *)device->ext;
+ if (!stor_device)
+ goto cleanup;
+
+ /*
+ * 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))
+ goto cleanup;
+ stor_device->ref_count++;
+cleanup:
+ spin_unlock_irqrestore(&device->ext_lock, flags);
+
+ return stor_device;
+}
+
+static int storvsc_channel_init(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ struct hv_storvsc_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 hv_storvsc_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 = VMSTOR_PROTOCOL_VERSION_CURRENT;
+ FILL_VMSTOR_REVISION(vstor_packet->version.revision);
+
+ 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:
+ put_stor_device(device);
+ return ret;
+}
+
+static void storvsc_on_io_completion(struct hv_device *device,
+ struct vstor_packet *vstor_packet,
+ struct hv_storvsc_request *request)
+{
+ struct storvsc_device *stor_device;
+ struct vstor_packet *stor_pkt;
+
+ stor_device = (struct storvsc_device *)device->ext;
+
+ stor_pkt = &request->vstor_packet;
+
+
+ /* 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 != 1){
+ DPRINT_WARN(STORVSC,
+ "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 & 0x80) {
+ /* autosense data available */
+ DPRINT_WARN(STORVSC, "storvsc 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;
+
+ request->on_io_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 hv_storvsc_request *request)
+{
+ switch (vstor_packet->operation) {
+ case VSTOR_OPERATION_COMPLETE_IO:
+ storvsc_on_io_completion(device, vstor_packet, request);
+ break;
+ case VSTOR_OPERATION_REMOVE_DEVICE:
+
+ 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 hv_storvsc_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 hv_storvsc_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);
+
+ put_stor_device(device);
+ 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));
+
+ /* Open the channel */
+ 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;
+}
+
+int storvsc_dev_add(struct hv_device *device,
+ void *additional_info)
+{
+ struct storvsc_device *stor_device;
+ struct storvsc_device_info *device_info;
+ int ret = 0;
+
+ device_info = (struct storvsc_device_info *)additional_info;
+ stor_device = alloc_stor_device(device);
+ if (!stor_device)
+ return -ENOMEM;
+
+ /* Save the channel properties to our storvsc channel */
+
+ /*
+ * If we support more than 1 scsi channel, we need to set the
+ * port number here to the scsi channel but how do we get the
+ * scsi channel prior to the bus scan.
+ *
+ * The host does not support this.
+ */
+
+ stor_device->port_number = device_info->port_number;
+ /* Send it back up */
+ ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size);
+ if (ret) {
+ kfree(stor_device);
+ return ret;
+ }
+ device_info->path_id = stor_device->path_id;
+ device_info->target_id = stor_device->target_id;
+
+ return ret;
+}
+
+int storvsc_dev_remove(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ unsigned long flags;
+
+ /*
+ * Since we currently hold a reference on the stor
+ * device, it is safe to dereference the ext
+ * pointer.
+ */
+ stor_device = (struct storvsc_device *)device->ext;
+
+ stor_device->destroy = true;
+
+ /*
+ * 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);
+
+ spin_lock_irqsave(&device->ext_lock, flags);
+ stor_device->ref_count = 0;
+ device->ext = NULL;
+ spin_unlock_irqrestore(&device->ext_lock, flags);
+
+ /* Close the channel */
+ vmbus_close(device->channel);
+
+ kfree(stor_device);
+ return 0;
+}
+
+int storvsc_do_io(struct hv_device *device,
+ struct hv_storvsc_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 = 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);
+
+ put_stor_device(device);
+ return ret;
+}
+
+/*
+ * The channel properties uniquely specify how the device is to be
+ * presented to the guest. Map this information for use by the block
+ * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest
+ * (storvsc_drv) and so scsi devices in the guest are handled by
+ * native upper level Linux drivers. Consequently, Hyper-V
+ * block driver, while being a generic block driver, presently does not
+ * deal with anything other than devices that would need to be presented
+ * to the guest as an IDE disk.
+ *
+ * This function maps the channel properties as embedded in the input
+ * parameter device_info onto information necessary to register the
+ * corresponding block device.
+ *
+ * Currently, there is no way to stop the emulation of the block device
+ * on the host side. And so, to prevent the native IDE drivers in Linux
+ * from taking over these devices (to be managedby Hyper-V block
+ * driver), we will take over if need be the major of the IDE controllers.
+ *
+ */
+
+int storvsc_get_major_info(struct storvsc_device_info *device_info,
+ struct storvsc_major_info *major_info)
+{
+ static bool ide0_registered;
+ static bool ide1_registered;
+
+ /*
+ * For now we only support IDE disks.
+ */
+ major_info->devname = "ide";
+ major_info->diskname = "hd";
+
+ if (device_info->path_id) {
+ major_info->major = 22;
+ if (!ide1_registered) {
+ major_info->do_register = true;
+ ide1_registered = true;
+ } else
+ major_info->do_register = false;
+
+ if (device_info->target_id)
+ major_info->index = 3;
+ else
+ major_info->index = 2;
+
+ return 0;
+ } else {
+ major_info->major = 3;
+ if (!ide0_registered) {
+ major_info->do_register = true;
+ ide0_registered = true;
+ } else
+ major_info->do_register = false;
+
+ if (device_info->target_id)
+ major_info->index = 1;
+ else
+ major_info->index = 0;
+
+ return 0;
+ }
+
+ return -ENODEV;
+}
static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;

module_param(storvsc_ringbuffer_size, int, S_IRUGO);
--
1.7.4.1


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