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ide: Add silent DRQ cancellation 

Split apart the ide_transfer_stop function into two versions: one that
interrupts and one that doesn't. The one that doesn't can be used to
halt any PIO transfers that are in the DRQ phase. It will not halt
any PIO transfers that are currently in the process of buffering data
for the guest to read.

Signed-off-by: John Snow <jsnow@redhat.com>
Reported-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
[Renamed 'etf' to 'end_transfer_func' --js]
Message-id: 1453225191-11871-6-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2016-02-10 13:29:39 -05:00
parent 51f7b5b883
commit e3044e2383
1 changed files with 18 additions and 3 deletions
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21
hw/ide/core.c
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@ -487,13 +487,28 @@ static void ide_cmd_done(IDEState *s)
}
}
void ide_transfer_stop(IDEState *s)
static void ide_transfer_halt(IDEState *s,
void(*end_transfer_func)(IDEState *),
bool notify)
{
s->end_transfer_func = ide_transfer_stop;
s->end_transfer_func = end_transfer_func;
s->data_ptr = s->io_buffer;
s->data_end = s->io_buffer;
s->status &= ~DRQ_STAT;
ide_cmd_done(s);
if (notify) {
ide_cmd_done(s);
}
}
void ide_transfer_stop(IDEState *s)
{
ide_transfer_halt(s, ide_transfer_stop, true);
}
__attribute__((__unused__))
static void ide_transfer_cancel(IDEState *s)
{
ide_transfer_halt(s, ide_transfer_cancel, false);
}
int64_t ide_get_sector(IDEState *s)