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From 31ce74359a069be69af0f6ba2f7867ed2083317a Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Tue, 8 Dec 2015 20:30:59 +0100
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Subject: [PATCH 21/27] ide-test: fix failure for test_flush
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <1449606659-23710-1-git-send-email-jsnow@redhat.com>
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Patchwork-id: 68521
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O-Subject: [RHEL-7.3 qemu-kvm PATCH v3 21/21] ide-test: fix failure for test_flush
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Bugzilla: 1272523
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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This patch is a combination of two patches:
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(1) Revert "qtest/ide-test: disable flush-test"
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(2) ide-test: fix failure for test_flush
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First, the downstream-only revert:
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This reverts commit 228e49fabffa644ab7a6a03e98205f293115dc89.
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Second, the backported fix:
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bd07684aacfb61668ae2c25b7dd00b64f3d7c7f3 added a test to ensure BSY
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flag is set when a flush request is in flight. It does this by setting
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a blkdebug breakpoint on flush_to_os before issuing a CMD_FLUSH_CACHE.
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It then resumes CMD_FLUSH_CACHE operation and checks that BSY is unset.
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The actual unsetting of BSY does not occur until ide_flush_cb gets
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called in a bh, however, so in some cases this check will race with
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the actual completion.
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Fix this by polling the ide status register until BSY flag gets unset
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before we do our final sanity checks. According to
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f68ec8379e88502b4841a110c070e9b118d3151c this is in line with how a guest
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would determine whether or not the device is still busy.
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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(cherry picked from commit 22bfa16ed3d4c9d534dcfe6f2381a654f32296b9)
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Signed-off-by: John Snow <jsnow@redhat.com>
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---
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 tests/ide-test.c | 41 +++++++++++++++++++++++++++++++++++++++++
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 1 file changed, 41 insertions(+)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 tests/ide-test.c | 41 +++++++++++++++++++++++++++++++++++++++++
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 1 file changed, 41 insertions(+)
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diff --git a/tests/ide-test.c b/tests/ide-test.c
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index 43b7fd6..92dd0e5 100644
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--- a/tests/ide-test.c
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+++ b/tests/ide-test.c
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@@ -425,6 +425,46 @@ static void test_identify(void)
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     ide_test_quit();
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 }
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+static void test_flush(void)
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+{
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+    uint8_t data;
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+
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+    ide_test_start(
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+        "-vnc none "
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+        "-drive file=blkdebug::%s,if=ide,cache=writeback",
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+        tmp_path);
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+
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+    /* Delay the completion of the flush request until we explicitly do it */
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+    qmp("{'execute':'human-monitor-command', 'arguments': { "
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+        "'command-line': 'qemu-io ide0-hd0 \"break flush_to_os A\"'} }");
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+
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+    /* FLUSH CACHE command on device 0*/
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+    outb(IDE_BASE + reg_device, 0);
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+    outb(IDE_BASE + reg_command, CMD_FLUSH_CACHE);
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+
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+    /* Check status while request is in flight*/
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+    data = inb(IDE_BASE + reg_status);
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+    assert_bit_set(data, BSY | DRDY);
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+    assert_bit_clear(data, DF | ERR | DRQ);
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+
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+    /* Complete the command */
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+    qmp("{'execute':'human-monitor-command', 'arguments': { "
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+        "'command-line': 'qemu-io ide0-hd0 \"resume A\"'} }");
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+
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+    /* Check registers */
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+    data = inb(IDE_BASE + reg_device);
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+    g_assert_cmpint(data & DEV, ==, 0);
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+
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+    do {
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+        data = inb(IDE_BASE + reg_status);
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+    } while (data & BSY);
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+
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+    assert_bit_set(data, DRDY);
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+    assert_bit_clear(data, BSY | DF | ERR | DRQ);
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+
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+    ide_test_quit();
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+}
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+
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 static void test_flush_nodev(void)
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 {
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     ide_test_start("");
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@@ -468,6 +508,7 @@ int main(int argc, char **argv)
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     qtest_add_func("/ide/bmdma/long_prdt", test_bmdma_long_prdt);
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     qtest_add_func("/ide/bmdma/teardown", test_bmdma_teardown);
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+    qtest_add_func("/ide/flush", test_flush);
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     qtest_add_func("/ide/flush_nodev", test_flush_nodev);
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     ret = g_test_run();
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-- 
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1.8.3.1
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