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[Qemu-devel] [PATCH 13/16] libqos/ahci: set the NCQ tag on command_commi


From: John Snow
Subject: [Qemu-devel] [PATCH 13/16] libqos/ahci: set the NCQ tag on command_commit
Date: Fri, 19 Jun 2015 21:50:44 -0400

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 <address@hidden>
---
 tests/libqos/ahci.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/libqos/ahci.c b/tests/libqos/ahci.c
index 953a320..7cf667a 100644
--- a/tests/libqos/ahci.c
+++ b/tests/libqos/ahci.c
@@ -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);
-- 
2.1.0




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