| /* |
| * |
| * 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> |
| * |
| */ |
| |
| |
| #ifndef _STORVSC_API_H_ |
| #define _STORVSC_API_H_ |
| |
| #include <linux/kernel.h> |
| #include <linux/wait.h> |
| #include "vstorage.h" |
| #include "vmbus_api.h" |
| #include "vmbus.h" |
| |
| /* Defines */ |
| #define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) |
| #define BLKVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) |
| |
| #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 hv_storvsc_request; |
| |
| /* Matches Windows-end */ |
| enum storvsc_request_type{ |
| WRITE_TYPE, |
| READ_TYPE, |
| UNKNOWN_TYPE, |
| }; |
| |
| |
| struct hv_storvsc_request { |
| struct hv_storvsc_request *request; |
| struct hv_device *device; |
| |
| /* Synchronize the request/response if needed */ |
| struct completion wait_event; |
| |
| unsigned char *sense_buffer; |
| void *context; |
| void (*on_io_completion)(struct hv_storvsc_request *request); |
| struct hv_multipage_buffer data_buffer; |
| |
| struct vstor_packet vstor_packet; |
| }; |
| |
| |
| /* Represents the block vsc driver */ |
| struct storvsc_driver { |
| struct hv_driver base; |
| |
| /* Set by caller (in bytes) */ |
| u32 ring_buffer_size; |
| }; |
| |
| struct storvsc_device_info { |
| u32 ring_buffer_size; |
| unsigned int port_number; |
| unsigned char path_id; |
| unsigned char target_id; |
| }; |
| |
| struct storvsc_major_info { |
| int major; |
| int index; |
| bool do_register; |
| char *devname; |
| char *diskname; |
| }; |
| |
| /* A storvsc device is a device object that contains a vmbus channel */ |
| struct storvsc_device { |
| struct hv_device *device; |
| |
| /* 0 indicates the device is being destroyed */ |
| atomic_t ref_count; |
| |
| bool drain_notify; |
| atomic_t num_outstanding_req; |
| |
| 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 hv_storvsc_request init_request; |
| struct hv_storvsc_request reset_request; |
| }; |
| |
| |
| /* Get the stordevice object iff exists and its refcount > 1 */ |
| static inline struct storvsc_device *get_stor_device(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = (struct storvsc_device *)device->ext; |
| if (stor_device && atomic_read(&stor_device->ref_count) > 1) |
| atomic_inc(&stor_device->ref_count); |
| else |
| stor_device = NULL; |
| |
| return stor_device; |
| } |
| |
| |
| static inline void put_stor_device(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = (struct storvsc_device *)device->ext; |
| |
| atomic_dec(&stor_device->ref_count); |
| } |
| |
| static inline struct storvsc_driver *hvdr_to_stordr(struct hv_driver *d) |
| { |
| return container_of(d, struct storvsc_driver, base); |
| } |
| |
| static inline |
| struct storvsc_driver *drv_to_stordrv(struct device_driver *d) |
| { |
| struct hv_driver *hvdrv = drv_to_hv_drv(d); |
| return hvdr_to_stordr(hvdrv); |
| } |
| |
| 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; |
| } |
| |
| /* Interface */ |
| |
| int storvsc_dev_add(struct hv_device *device, |
| void *additional_info); |
| int storvsc_dev_remove(struct hv_device *device); |
| |
| int storvsc_do_io(struct hv_device *device, |
| struct hv_storvsc_request *request); |
| |
| int storvsc_get_major_info(struct storvsc_device_info *device_info, |
| struct storvsc_major_info *major_info); |
| |
| #endif /* _STORVSC_API_H_ */ |