[Qemu-devel] [PATCH 10/15] qtest/ahci: Add port_check_nonbusy helper

[John Snow <jsnow@redhat.com>]

A simple helper that asserts a given port is
not busy processing any commands via the
TFD, Command Issue and SACT registers.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 tests/ahci-test.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tests/ahci-test.c b/tests/ahci-test.c
index 315e6e9..b7bfd86 100644
--- a/tests/ahci-test.c
+++ b/tests/ahci-test.c
@@ -1328,6 +1328,24 @@ static void port_check_interrupts(AHCIState *ahci, uint8_t px,
     g_assert_cmphex(PX_RREG(px, AHCI_PX_IS), ==, 0);
 }
 
+static void port_check_nonbusy(AHCIState *ahci, uint8_t px, uint8_t cx)
+{
+    uint32_t reg;
+
+    /* Assert that the command slot is no longer busy (NCQ) */
+    reg = PX_RREG(px, AHCI_PX_SACT);
+    ASSERT_BIT_CLEAR(reg, (1 << cx));
+
+    /* Non-NCQ */
+    reg = PX_RREG(px, AHCI_PX_CI);
+    ASSERT_BIT_CLEAR(reg, (1 << cx));
+
+    /* And assert that we are generally not busy. */
+    reg = PX_RREG(px, AHCI_PX_TFD);
+    ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_BSY);
+    ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_DRQ);
+}
+
 /* Get the #cx'th command of port #px. */
 static void get_command_header(AHCIState *ahci, uint8_t px,
                                uint8_t cx, AHCICommand *cmd)
@@ -1580,6 +1598,7 @@ static void ahci_test_identify(AHCIState *ahci)
     port_check_error(ahci, i);
     /* BUG: we expect AHCI_PX_IS_DPS to be set. */
     port_check_interrupts(ahci, i, AHCI_PX_IS_DHRS | AHCI_PX_IS_PSS);
+    port_check_nonbusy(ahci, i, cx);
 
     /* Investigate the CMD, assert that we read 512 bytes */
     get_command_header(ahci, i, cx, &cmd);
-- 
1.9.3