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scsi: move SCSIRequest management to common code. 

Create generic functions to allocate, find and release SCSIRequest
structs.  Make scsi-disk and scsi-generic use them.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Gerd Hoffmann 2009-11-26 15:33:50 +01:00 committed by Anthony Liguori
parent 9af99d980e
commit 89b08ae154
4 changed files with 52 additions and 40 deletions
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31
hw/scsi-bus.c
View File

@ -111,3 +111,34 @@ void scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
scsi_bus_legacy_add_drive(bus, dinfo, unit);
}
}
SCSIRequest *scsi_req_alloc(size_t size, SCSIDevice *d, uint32_t tag, uint32_t lun)
{
SCSIRequest *req;
req = qemu_mallocz(size);
req->bus = scsi_bus_from_device(d);
req->dev = d;
req->tag = tag;
req->lun = lun;
QTAILQ_INSERT_TAIL(&d->requests, req, next);
return req;
}
SCSIRequest *scsi_req_find(SCSIDevice *d, uint32_t tag)
{
SCSIRequest *req;
QTAILQ_FOREACH(req, &d->requests, next) {
if (req->tag == tag) {
return req;
}
}
return NULL;
}
void scsi_req_free(SCSIRequest *req)
{
QTAILQ_REMOVE(&req->dev->requests, req, next);
qemu_free(req);
}

27
hw/scsi-disk.c
View File

@ -71,37 +71,26 @@ struct SCSIDiskState
QEMUBH *bh;
};
static SCSIDiskReq *scsi_new_request(SCSIDevice *d, uint32_t tag)
static SCSIDiskReq *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun)
{
SCSIRequest *req;
SCSIDiskReq *r;
r = qemu_mallocz(sizeof(SCSIDiskReq));
req = scsi_req_alloc(sizeof(SCSIDiskReq), d, tag, lun);
r = DO_UPCAST(SCSIDiskReq, req, req);
r->iov.iov_base = qemu_memalign(512, SCSI_DMA_BUF_SIZE);
r->req.bus = scsi_bus_from_device(d);
r->req.dev = d;
r->req.tag = tag;
QTAILQ_INSERT_TAIL(&d->requests, &r->req, next);
return r;
}
static void scsi_remove_request(SCSIDiskReq *r)
{
qemu_free(r->iov.iov_base);
QTAILQ_REMOVE(&r->req.dev->requests, &r->req, next);
qemu_free(r);
scsi_req_free(&r->req);
}
static SCSIDiskReq *scsi_find_request(SCSIDiskState *s, uint32_t tag)
{
SCSIRequest *req;
QTAILQ_FOREACH(req, &s->qdev.requests, next) {
if (req->tag == tag) {
return DO_UPCAST(SCSIDiskReq, req, req);
}
}
return NULL;
return DO_UPCAST(SCSIDiskReq, req, scsi_req_find(&s->qdev, tag));
}
/* Helper function for command completion. */
@ -113,8 +102,8 @@ static void scsi_command_complete(SCSIDiskReq *r, int status, int sense)
r->req.tag, status, sense);
s->sense = sense;
tag = r->req.tag;
scsi_remove_request(r);
r->req.bus->complete(r->req.bus, SCSI_REASON_DONE, tag, status);
scsi_remove_request(r);
}
/* Cancel a pending data transfer. */
@ -349,7 +338,7 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
}
/* ??? Tags are not unique for different luns. We only implement a
single lun, so this should not matter. */
r = scsi_new_request(d, tag);
r = scsi_new_request(d, tag, lun);
outbuf = (uint8_t *)r->iov.iov_base;
is_write = 0;
DPRINTF("Command: lun=%d tag=0x%x data=0x%02x", lun, tag, buf[0]);

29
hw/scsi-generic.c
View File

@ -76,36 +76,23 @@ struct SCSIGenericState
uint8_t senselen;
};
static SCSIGenericReq *scsi_new_request(SCSIDevice *d, uint32_t tag)
static SCSIGenericReq *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun)
{
SCSIGenericReq *r;
SCSIRequest *req;
r = qemu_mallocz(sizeof(SCSIGenericReq));
r->req.bus = scsi_bus_from_device(d);
r->req.dev = d;
r->req.tag = tag;
QTAILQ_INSERT_TAIL(&d->requests, &r->req, next);
return r;
req = scsi_req_alloc(sizeof(SCSIGenericReq), d, tag, lun);
return DO_UPCAST(SCSIGenericReq, req, req);
}
static void scsi_remove_request(SCSIGenericReq *r)
{
qemu_free(r->buf);
QTAILQ_REMOVE(&r->req.dev->requests, &r->req, next);
qemu_free(r);
scsi_req_free(&r->req);
}
static SCSIGenericReq *scsi_find_request(SCSIGenericState *s, uint32_t tag)
{
SCSIRequest *req;
QTAILQ_FOREACH(req, &s->qdev.requests, next) {
if (req->tag == tag) {
return DO_UPCAST(SCSIGenericReq, req, req);
}
}
return NULL;
return DO_UPCAST(SCSIGenericReq, req, scsi_req_find(&s->qdev, tag));
}
/* Helper function for command completion. */
@ -136,8 +123,8 @@ static void scsi_command_complete(void *opaque, int ret)
DPRINTF("Command complete 0x%p tag=0x%x status=%d\n",
r, r->req.tag, status);
tag = r->req.tag;
scsi_remove_request(r);
r->req.bus->complete(r->req.bus, SCSI_REASON_DONE, tag, status);
scsi_remove_request(r);
}
/* Cancel a pending data transfer. */
@ -520,7 +507,7 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
BADF("Tag 0x%x already in use %p\n", tag, r);
scsi_cancel_io(d, tag);
}
r = scsi_new_request(d, tag);
r = scsi_new_request(d, tag, lun);
memcpy(r->cmd, cmd, cmdlen);
r->cmdlen = cmdlen;

5
hw/scsi.h
View File

@ -20,6 +20,7 @@ typedef struct SCSIRequest {
SCSIBus *bus;
SCSIDevice *dev;
uint32_t tag;
uint32_t lun;
BlockDriverAIOCB *aiocb;
QTAILQ_ENTRY(SCSIRequest) next;
} SCSIRequest;
@ -74,4 +75,8 @@ static inline SCSIBus *scsi_bus_from_device(SCSIDevice *d)
SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, DriveInfo *dinfo, int unit);
void scsi_bus_legacy_handle_cmdline(SCSIBus *bus);
SCSIRequest *scsi_req_alloc(size_t size, SCSIDevice *d, uint32_t tag, uint32_t lun);
SCSIRequest *scsi_req_find(SCSIDevice *d, uint32_t tag);
void scsi_req_free(SCSIRequest *req);
#endif