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scsi: add scatter/gather functionality

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Scatter/gather functionality uses the newly added DMA helpers.  The
device can choose between doing DMA itself, or calling scsi_req_data
as usual, which will use the newly added DMA helpers to copy piecewise
to/from the destination area(s).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-07-06 11:26:47 +02:00
parent 01e9545588
commit 3d5aba97e9
2 changed files with 29 additions and 2 deletions
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3
hw/scsi.h
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@ -49,6 +49,8 @@ struct SCSIRequest {
size_t resid;
SCSICommand cmd;
BlockDriverAIOCB *aiocb;
QEMUSGList *sg;
bool dma_started;
uint8_t sense[SCSI_SENSE_BUF_SIZE];
uint32_t sense_len;
bool enqueued;
@ -115,6 +117,7 @@ struct SCSIBusInfo {
void (*transfer_data)(SCSIRequest *req, uint32_t arg);
void (*complete)(SCSIRequest *req, uint32_t arg, size_t resid);
void (*cancel)(SCSIRequest *req);
QEMUSGList *(*get_sg_list)(SCSIRequest *req);
};
struct SCSIBus {