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hw/dma: Let dma_buf_read() / dma_buf_write() propagate MemTxResult

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Since commit 292e13142d, dma_buf_rw() returns a MemTxResult type.
Do not discard it, return it to the caller. Pass the previously
returned value (the QEMUSGList residual size, which was rarely used)
as an optional argument.

With this new API, SCSIRequest::residual might now be accessed via
a pointer. Since the size_t type does not have the same size on
32 and 64-bit host architectures, convert it to a uint64_t, which
is big enough to hold the residual size, and the type is constant
on both 32/64-bit hosts.

Update the few dma_buf_read() / dma_buf_write() callers to the new
API.

Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Peter Xu <peterx@redhat.com>
Message-Id: <20220117125130.131828-1-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2021-12-16 09:36:38 +01:00 • committed by Philippe Mathieu-Daudé
parent bfa30f3903
commit f02b664aad
7 changed files with 59 additions and 40 deletions
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2
include/hw/scsi/scsi.h
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@ -30,7 +30,7 @@ struct SCSIRequest {
int16_t status;
int16_t host_status;
void *hba_private;
size_t residual;
uint64_t residual;
SCSICommand cmd;
NotifierList cancel_notifiers;