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scsi: introduce requests_lock

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SCSIDevice keeps track of in-flight requests for device reset and Task
Management Functions (TMFs). The request list requires protection so
that multi-threaded SCSI emulation can be implemented in commits that
follow.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20250311132616.1049687-5-stefanha@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2025-03-11 21:26:07 +08:00 • committed by Kevin Wolf
parent 7eecba3778
commit 1cf18cc9bf
2 changed files with 88 additions and 39 deletions
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7
include/hw/scsi/scsi.h
View file

@ -49,6 +49,8 @@ struct SCSIRequest {
bool dma_started;
BlockAIOCB *aiocb;
QEMUSGList *sg;
/* Protected by SCSIDevice->requests_lock */
QTAILQ_ENTRY(SCSIRequest) next;
};
@ -77,10 +79,7 @@ struct SCSIDevice
uint8_t sense[SCSI_SENSE_BUF_SIZE];
uint32_t sense_len;
/*
* The requests list is only accessed from the AioContext that executes
* requests or from the main loop when IOThread processing is stopped.
*/
QemuMutex requests_lock; /* protects the requests list */
QTAILQ_HEAD(, SCSIRequest) requests;
uint32_t channel;