[RFC PATCH v4 14/24] vfio/ccw: Use vfio_[attach/detach]_device

[Zhenzhong Duan]

From: Eric Auger <eric.auger@redhat.com>

Let the vfio-ccw device use vfio_attach_device() and
vfio_detach_device(), hence hiding the details of the used
IOMMU backend.

Also now all the devices have been migrated to use the new
vfio_attach_device/vfio_detach_device API, let's turn the
legacy functions into static functions, local to container.c.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/vfio/ccw.c                 | 122 +++++++++-------------------------
 hw/vfio/container.c           |   8 +--
 include/hw/vfio/vfio-common.h |   4 --
 3 files changed, 34 insertions(+), 100 deletions(-)

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 1e2fce83b0..e19087566d 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -572,88 +572,15 @@ static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
     g_free(vcdev->io_region);
 }
 
-static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
-{
-    g_free(vcdev->vdev.name);
-    vfio_put_base_device(&vcdev->vdev);
-}
-
-static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
-                                Error **errp)
-{
-    S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev);
-    char *name = g_strdup_printf("%x.%x.%04x", cdev->hostid.cssid,
-                                 cdev->hostid.ssid,
-                                 cdev->hostid.devid);
-    VFIODevice *vbasedev;
-
-    QLIST_FOREACH(vbasedev, &group->device_list, next) {
-        if (strcmp(vbasedev->name, name) == 0) {
-            error_setg(errp, "vfio: subchannel %s has already been attached",
-                       name);
-            goto out_err;
-        }
-    }
-
-    /*
-     * All vfio-ccw devices are believed to operate in a way compatible with
-     * discarding of memory in RAM blocks, ie. pages pinned in the host are
-     * in the current working set of the guest driver and therefore never
-     * overlap e.g., with pages available to the guest balloon driver.  This
-     * needs to be set before vfio_get_device() for vfio common to handle
-     * ram_block_discard_disable().
-     */
-    vcdev->vdev.ram_block_discard_allowed = true;
-
-    if (vfio_get_device(group, cdev->mdevid, &vcdev->vdev, errp)) {
-        goto out_err;
-    }
-
-    vcdev->vdev.ops = &vfio_ccw_ops;
-    vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
-    vcdev->vdev.name = name;
-    vcdev->vdev.dev = DEVICE(vcdev);
-
-    return;
-
-out_err:
-    g_free(name);
-}
-
-static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
-{
-    char *tmp, group_path[PATH_MAX];
-    ssize_t len;
-    int groupid;
-
-    tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group",
-                          cdev->hostid.cssid, cdev->hostid.ssid,
-                          cdev->hostid.devid, cdev->mdevid);
-    len = readlink(tmp, group_path, sizeof(group_path));
-    g_free(tmp);
-
-    if (len <= 0 || len >= sizeof(group_path)) {
-        error_setg(errp, "vfio: no iommu_group found");
-        return NULL;
-    }
-
-    group_path[len] = 0;
-
-    if (sscanf(basename(group_path), "%d", &groupid) != 1) {
-        error_setg(errp, "vfio: failed to read %s", group_path);
-        return NULL;
-    }
-
-    return vfio_get_group(groupid, &address_space_memory, errp);
-}
-
 static void vfio_ccw_realize(DeviceState *dev, Error **errp)
 {
-    VFIOGroup *group;
-    S390CCWDevice *cdev = S390_CCW_DEVICE(dev);
-    VFIOCCWDevice *vcdev = VFIO_CCW(cdev);
+    CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
+    S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
+    VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
+    VFIODevice *vbasedev = &vcdev->vdev;
     Error *err = NULL;
+    int ret;
 
     /* Call the class init function for subchannel. */
     if (cdc->realize) {
@@ -662,15 +589,30 @@ static void vfio_ccw_realize(DeviceState *dev, Error 
**errp)
             goto out_err_propagate;
         }
     }
+    vbasedev->sysfsdev = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s",
+                                         vcdev->cdev.hostid.cssid,
+                                         vcdev->cdev.hostid.ssid,
+                                         vcdev->cdev.hostid.devid,
+                                         cdev->mdevid);
+    vbasedev->ops = &vfio_ccw_ops;
+    vbasedev->type = VFIO_DEVICE_TYPE_CCW;
+    vbasedev->name = g_strdup(cdev->mdevid);
+    vbasedev->dev = &vcdev->cdev.parent_obj.parent_obj;
 
-    group = vfio_ccw_get_group(cdev, &err);
-    if (!group) {
-        goto out_group_err;
-    }
+    /*
+     * All vfio-ccw devices are believed to operate in a way compatible with
+     * discarding of memory in RAM blocks, ie. pages pinned in the host are
+     * in the current working set of the guest driver and therefore never
+     * overlap e.g., with pages available to the guest balloon driver.  This
+     * needs to be set before vfio_get_device() for vfio common to handle
+     * ram_block_discard_disable().
+     */
+    vbasedev->ram_block_discard_allowed = true;
 
-    vfio_ccw_get_device(group, vcdev, &err);
-    if (err) {
-        goto out_device_err;
+    ret = vfio_attach_device(vbasedev->name, vbasedev,
+                             &address_space_memory, errp);
+    if (ret) {
+        goto out_get_dev_err;
     }
 
     vfio_ccw_get_region(vcdev, &err);
@@ -708,10 +650,8 @@ out_irq_notifier_err:
 out_io_notifier_err:
     vfio_ccw_put_region(vcdev);
 out_region_err:
-    vfio_ccw_put_device(vcdev);
-out_device_err:
-    vfio_put_group(group);
-out_group_err:
+    vfio_detach_device(vbasedev);
+out_get_dev_err:
     if (cdc->unrealize) {
         cdc->unrealize(cdev);
     }
@@ -724,14 +664,12 @@ static void vfio_ccw_unrealize(DeviceState *dev)
     S390CCWDevice *cdev = S390_CCW_DEVICE(dev);
     VFIOCCWDevice *vcdev = VFIO_CCW(cdev);
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
-    VFIOGroup *group = vcdev->vdev.group;
 
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
     vfio_ccw_put_region(vcdev);
-    vfio_ccw_put_device(vcdev);
-    vfio_put_group(group);
+    vfio_detach_device(&vcdev->vdev);
 
     if (cdc->unrealize) {
         cdc->unrealize(cdev);
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 23b9d5a901..0dc2511d71 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -865,7 +865,7 @@ static void vfio_disconnect_container(VFIOGroup *group)
     }
 }
 
-VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
+static VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
 {
     VFIOGroup *group;
     VFIOContainer *bcontainer;
@@ -930,7 +930,7 @@ free_group_exit:
     return NULL;
 }
 
-void vfio_put_group(VFIOGroup *group)
+static void vfio_put_group(VFIOGroup *group)
 {
     if (!group || !QLIST_EMPTY(&group->device_list)) {
         return;
@@ -947,8 +947,8 @@ void vfio_put_group(VFIOGroup *group)
     g_free(group);
 }
 
-int vfio_get_device(VFIOGroup *group, const char *name,
-                    VFIODevice *vbasedev, Error **errp)
+static int vfio_get_device(VFIOGroup *group, const char *name,
+                           VFIODevice *vbasedev, Error **errp)
 {
     g_autofree struct vfio_device_info *info = NULL;
     int fd;
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index f42aef2515..96bb27ceea 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -182,11 +182,7 @@ void vfio_region_unmap(VFIORegion *region);
 void vfio_region_exit(VFIORegion *region);
 void vfio_region_finalize(VFIORegion *region);
 void vfio_reset_handler(void *opaque);
-VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp);
-void vfio_put_group(VFIOGroup *group);
 struct vfio_device_info *vfio_get_device_info(int fd);
-int vfio_get_device(VFIOGroup *group, const char *name,
-                    VFIODevice *vbasedev, Error **errp);
 int vfio_attach_device(char *name, VFIODevice *vbasedev,
                        AddressSpace *as, Error **errp);
 void vfio_detach_device(VFIODevice *vbasedev);
-- 
2.34.1