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scsi: introduce SCSIBusOps

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There are more operations than a SCSI bus can handle, besides completing
commands.  One example, which this series will introduce, is cleaning up
after a request is cancelled.

More long term, a "SCSI bus" can represent the LUNs attached to a
target; in this case, while all commands will ultimately reach a logical
unit, it is the target who is in charge of answering REPORT LUNs.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Paolo Bonzini 2011-04-18 17:11:14 +02:00
parent ab9adc88c8
commit cfdc1bb06e
7 changed files with 34 additions and 17 deletions
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13
hw/scsi.h
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@ -16,10 +16,9 @@ enum scsi_reason {
};
typedef struct SCSIBus SCSIBus;
typedef struct SCSIBusOps SCSIBusOps;
typedef struct SCSIDevice SCSIDevice;
typedef struct SCSIDeviceInfo SCSIDeviceInfo;
typedef void (*scsi_completionfn)(SCSIBus *bus, int reason, uint32_t tag,
uint32_t arg);
enum SCSIXferMode {
SCSI_XFER_NONE, /* TEST_UNIT_READY, ... */
@ -74,20 +73,22 @@ struct SCSIDeviceInfo {
uint8_t *(*get_buf)(SCSIDevice *s, uint32_t tag);
};
typedef void (*SCSIAttachFn)(DeviceState *host, BlockDriverState *bdrv,
int unit);
struct SCSIBusOps {
void (*complete)(SCSIBus *bus, int reason, uint32_t tag, uint32_t arg);
};
struct SCSIBus {
BusState qbus;
int busnr;
int tcq, ndev;
scsi_completionfn complete;
const SCSIBusOps *ops;
SCSIDevice *devs[MAX_SCSI_DEVS];
};
void scsi_bus_new(SCSIBus *bus, DeviceState *host, int tcq, int ndev,
scsi_completionfn complete);
const SCSIBusOps *ops);
void scsi_qdev_register(SCSIDeviceInfo *info);
static inline SCSIBus *scsi_bus_from_device(SCSIDevice *d)