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hw/ide/ahci: fix ahci_write_fis_sdb()

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When there is an error, we need to raise a TFES error irq, see AHCI 1.3.1,
5.3.13.1 SDB:Entry.

If ERR_STAT is set, we jump to state ERR:FatalTaskfile, which will raise
a TFES IRQ unconditionally, regardless if the I bit is set in the FIS or
not.

Thus, we should never raise a normal IRQ after having sent an error IRQ.

It is valid to signal successfully completed commands as finished in the
same SDB FIS that generates the error IRQ. The important thing is that
commands that did not complete successfully (e.g. commands that were
aborted, do not get the finished bit set).

Before this commit, there was never a TFES IRQ raised on NCQ error.

Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20230609140844.202795-8-nks@flawful.org
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Niklas Cassel 2023-06-09 16:08:43 +02:00 committed by John Snow
parent 1a16ce64fd
commit 7e85cb0db4
1 changed files with 8 additions and 2 deletions
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10
hw/ide/ahci.c
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@ -806,8 +806,14 @@ static void ahci_write_fis_sdb(AHCIState *s, NCQTransferState *ncq_tfs)
pr->scr_act &= ~ad->finished;
ad->finished = 0;
/* Trigger IRQ if interrupt bit is set (which currently, it always is) */
if (sdb_fis->flags & 0x40) {
/*
* TFES IRQ is always raised if ERR_STAT is set, regardless of I bit.
* If ERR_STAT is not set, trigger SDBS IRQ if interrupt bit is set
* (which currently, it always is).
*/
if (sdb_fis->status & ERR_STAT) {
ahci_trigger_irq(s, ad, AHCI_PORT_IRQ_BIT_TFES);
} else if (sdb_fis->flags & 0x40) {
ahci_trigger_irq(s, ad, AHCI_PORT_IRQ_BIT_SDBS);
}
}