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libqos/ahci: set the NCQ tag on command_commit 

NCQ commands have the concept of a "TAG" that they need to set,
but in the AHCI world, it is mandated that the TAG always match
the command slot that you executed the NCQ from.

See AHCI 9.3.1.1.5.2 "Native Queued Commands".

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1435016308-6150-14-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2015-07-04 02:06:04 -04:00
parent 359790c254
commit a8973ff50a
1 changed files with 5 additions and 0 deletions
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5
tests/libqos/ahci.c
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@ -857,6 +857,11 @@ void ahci_command_commit(AHCIQState *ahci, AHCICommand *cmd, uint8_t port)
cmd->port = port;
cmd->slot = ahci_pick_cmd(ahci, port);
if (cmd->props->ncq) {
NCQFIS *nfis = (NCQFIS *)&cmd->fis;
nfis->tag = (cmd->slot << 3) & 0xFC;
}
/* Create a buffer for the command table */
prdtl = size_to_prdtl(cmd->xbytes, cmd->prd_size);
table_size = CMD_TBL_SIZ(prdtl);