tests: Functions bus_foreach and device_find from libqos virtio API

Virtio header has been changed to compile and work with a real device.
Functions bus_foreach and device_find have been implemented for PCI.
Virtio-blk test case now opens a fake device.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Marc Marí <marc.mari.barcelo@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

tests/Makefile

@@ -299,6 +299,7 @@ libqos-obj-y += tests/libqos/i2c.o
 libqos-pc-obj-y = $(libqos-obj-y) tests/libqos/pci-pc.o
 libqos-pc-obj-y += tests/libqos/malloc-pc.o
 libqos-omap-obj-y = $(libqos-obj-y) tests/libqos/i2c-omap.o
+libqos-virtio-obj-y = $(libqos-obj-y) $(libqos-pc-obj-y) tests/libqos/virtio-pci.o
 
 tests/rtc-test$(EXESUF): tests/rtc-test.o
 tests/m48t59-test$(EXESUF): tests/m48t59-test.o
@@ -320,7 +321,7 @@ tests/vmxnet3-test$(EXESUF): tests/vmxnet3-test.o
 tests/ne2000-test$(EXESUF): tests/ne2000-test.o
 tests/wdt_ib700-test$(EXESUF): tests/wdt_ib700-test.o
 tests/virtio-balloon-test$(EXESUF): tests/virtio-balloon-test.o
-tests/virtio-blk-test$(EXESUF): tests/virtio-blk-test.o
+tests/virtio-blk-test$(EXESUF): tests/virtio-blk-test.o $(libqos-virtio-obj-y)
 tests/virtio-net-test$(EXESUF): tests/virtio-net-test.o
 tests/virtio-rng-test$(EXESUF): tests/virtio-rng-test.o
 tests/virtio-scsi-test$(EXESUF): tests/virtio-scsi-test.o

tests/libqos/virtio-pci.c

@@ -0,0 +1,75 @@
+/*
+ * libqos virtio PCI driver
+ *
+ * Copyright (c) 2014 Marc Marí
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <glib.h>
+#include "libqtest.h"
+#include "libqos/virtio.h"
+#include "libqos/virtio-pci.h"
+#include "libqos/pci.h"
+#include "libqos/pci-pc.h"
+
+#include "hw/pci/pci_regs.h"
+
+typedef struct QVirtioPCIForeachData {
+    void (*func)(QVirtioDevice *d, void *data);
+    uint16_t device_type;
+    void *user_data;
+} QVirtioPCIForeachData;
+
+static QVirtioPCIDevice *qpcidevice_to_qvirtiodevice(QPCIDevice *pdev)
+{
+    QVirtioPCIDevice *vpcidev;
+    vpcidev = g_malloc0(sizeof(*vpcidev));
+
+    if (pdev) {
+        vpcidev->pdev = pdev;
+        vpcidev->vdev.device_type =
+                            qpci_config_readw(vpcidev->pdev, PCI_SUBSYSTEM_ID);
+    }
+
+    return vpcidev;
+}
+
+static void qvirtio_pci_foreach_callback(
+                        QPCIDevice *dev, int devfn, void *data)
+{
+    QVirtioPCIForeachData *d = data;
+    QVirtioPCIDevice *vpcidev = qpcidevice_to_qvirtiodevice(dev);
+
+    if (vpcidev->vdev.device_type == d->device_type) {
+        d->func(&vpcidev->vdev, d->user_data);
+    } else {
+        g_free(vpcidev);
+    }
+}
+
+static void qvirtio_pci_assign_device(QVirtioDevice *d, void *data)
+{
+    QVirtioPCIDevice **vpcidev = data;
+    *vpcidev = (QVirtioPCIDevice *)d;
+}
+
+void qvirtio_pci_foreach(QPCIBus *bus, uint16_t device_type,
+                void (*func)(QVirtioDevice *d, void *data), void *data)
+{
+    QVirtioPCIForeachData d = { .func = func,
+                                .device_type = device_type,
+                                .user_data = data };
+
+    qpci_device_foreach(bus, QVIRTIO_VENDOR_ID, -1,
+                                qvirtio_pci_foreach_callback, &d);
+}
+
+QVirtioPCIDevice *qvirtio_pci_device_find(QPCIBus *bus, uint16_t device_type)
+{
+    QVirtioPCIDevice *dev = NULL;
+    qvirtio_pci_foreach(bus, device_type, qvirtio_pci_assign_device, &dev);
+
+    return dev;
+}

tests/libqos/virtio-pci.h

@@ -0,0 +1,24 @@
+/*
+ * libqos virtio PCI definitions
+ *
+ * Copyright (c) 2014 Marc Marí
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef LIBQOS_VIRTIO_PCI_H
+#define LIBQOS_VIRTIO_PCI_H
+
+#include "libqos/virtio.h"
+#include "libqos/pci.h"
+
+typedef struct QVirtioPCIDevice {
+    QVirtioDevice vdev;
+    QPCIDevice *pdev;
+} QVirtioPCIDevice;
+
+void qvirtio_pci_foreach(QPCIBus *bus, uint16_t device_type,
+                void (*func)(QVirtioDevice *d, void *data), void *data);
+QVirtioPCIDevice *qvirtio_pci_device_find(QPCIBus *bus, uint16_t device_type);
+#endif

tests/libqos/virtio.h

@@ -0,0 +1,23 @@
+/*
+ * libqos virtio definitions
+ *
+ * Copyright (c) 2014 Marc Marí
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef LIBQOS_VIRTIO_H
+#define LIBQOS_VIRTIO_H
+
+#define QVIRTIO_VENDOR_ID       0x1AF4
+
+#define QVIRTIO_NET_DEVICE_ID   0x1
+#define QVIRTIO_BLK_DEVICE_ID   0x2
+
+typedef struct QVirtioDevice {
+    /* Device type */
+    uint16_t device_type;
+} QVirtioDevice;
+
+#endif

tests/virtio-blk-test.c

@@ -2,6 +2,7 @@
  * QTest testcase for VirtIO Block Device
  *
  * Copyright (c) 2014 SUSE LINUX Products GmbH
+ * Copyright (c) 2014 Marc Marí
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
@@ -9,12 +10,59 @@
 
 #include <glib.h>
 #include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
 #include "libqtest.h"
-#include "qemu/osdep.h"
+#include "libqos/virtio.h"
+#include "libqos/virtio-pci.h"
+#include "libqos/pci-pc.h"
 
-/* Tests only initialization so far. TODO: Replace with functional tests */
-static void pci_nop(void)
+#define TEST_IMAGE_SIZE (64 * 1024 * 1024)
+#define PCI_SLOT    0x04
+#define PCI_FN      0x00
+
+static QPCIBus *test_start(void)
 {
+    char cmdline[100];
+    char tmp_path[] = "/tmp/qtest.XXXXXX";
+    int fd, ret;
+
+    /* Create a temporary raw image */
+    fd = mkstemp(tmp_path);
+    g_assert_cmpint(fd, >=, 0);
+    ret = ftruncate(fd, TEST_IMAGE_SIZE);
+    g_assert_cmpint(ret, ==, 0);
+    close(fd);
+
+    snprintf(cmdline, 100, "-drive if=none,id=drive0,file=%s "
+                            "-device virtio-blk-pci,drive=drive0,addr=%x.%x",
+                            tmp_path, PCI_SLOT, PCI_FN);
+    qtest_start(cmdline);
+    unlink(tmp_path);
+
+    return qpci_init_pc();
+}
+
+static void test_end(void)
+{
+    qtest_end();
+}
+
+static void pci_basic(void)
+{
+    QVirtioPCIDevice *dev;
+    QPCIBus *bus;
+
+    bus = test_start();
+
+    dev = qvirtio_pci_device_find(bus, QVIRTIO_BLK_DEVICE_ID);
+    g_assert(dev != NULL);
+    g_assert_cmphex(dev->vdev.device_type, ==, QVIRTIO_BLK_DEVICE_ID);
+    g_assert_cmphex(dev->pdev->devfn, ==, ((PCI_SLOT << 3) | PCI_FN));
+
+    g_free(dev);
+    test_end();
 }
 
 int main(int argc, char **argv)
@@ -22,13 +70,10 @@ int main(int argc, char **argv)
     int ret;
 
     g_test_init(&argc, &argv, NULL);
-    qtest_add_func("/virtio/blk/pci/nop", pci_nop);
 
-    qtest_start("-drive id=drv0,if=none,file=/dev/null "
-                "-device virtio-blk-pci,drive=drv0");
+    g_test_add_func("/virtio/blk/pci/basic", pci_basic);
+
     ret = g_test_run();
 
-    qtest_end();
-
     return ret;
 }