vfio/pci: Introduce a vfio pci hot reset interface

Legacy vfio pci and iommufd cdev have different process to hot reset
vfio device, expand current code to abstract out pci_hot_reset callback
for legacy vfio, this same interface will also be used by iommufd
cdev vfio device.

Rename vfio_pci_hot_reset to vfio_legacy_pci_hot_reset and move it
into container.c.

vfio_pci_[pre/post]_reset and vfio_pci_host_match are exported so
they could be called in legacy and iommufd pci_hot_reset callback.

Suggested-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

1 files changed, 6 insertions, 162 deletions

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index eb55e8ae88..d00c3472c7 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2374,7 +2374,7 @@ static int vfio_add_capabilities(VFIOPCIDevice *vdev, Error **errp)
     return 0;
 }
 
-static void vfio_pci_pre_reset(VFIOPCIDevice *vdev)
+void vfio_pci_pre_reset(VFIOPCIDevice *vdev)
 {
     PCIDevice *pdev = &vdev->pdev;
     uint16_t cmd;
@@ -2411,7 +2411,7 @@ static void vfio_pci_pre_reset(VFIOPCIDevice *vdev)
     vfio_pci_write_config(pdev, PCI_COMMAND, cmd, 2);
 }
 
-static void vfio_pci_post_reset(VFIOPCIDevice *vdev)
+void vfio_pci_post_reset(VFIOPCIDevice *vdev)
 {
     Error *err = NULL;
     int nr;
@@ -2435,7 +2435,7 @@ static void vfio_pci_post_reset(VFIOPCIDevice *vdev)
     vfio_quirk_reset(vdev);
 }
 
-static bool vfio_pci_host_match(PCIHostDeviceAddress *addr, const char *name)
+bool vfio_pci_host_match(PCIHostDeviceAddress *addr, const char *name)
 {
     char tmp[13];
 
@@ -2485,166 +2485,10 @@ int vfio_pci_get_pci_hot_reset_info(VFIOPCIDevice *vdev,
 
 static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single)
 {
-    VFIOGroup *group;
-    struct vfio_pci_hot_reset_info *info = NULL;
-    struct vfio_pci_dependent_device *devices;
-    struct vfio_pci_hot_reset *reset;
-    int32_t *fds;
-    int ret, i, count;
-    bool multi = false;
-
-    trace_vfio_pci_hot_reset(vdev->vbasedev.name, single ? "one" : "multi");
-
-    if (!single) {
-        vfio_pci_pre_reset(vdev);
-    }
-    vdev->vbasedev.needs_reset = false;
-
-    ret = vfio_pci_get_pci_hot_reset_info(vdev, &info);
-
-    if (ret) {
-        goto out_single;
-    }
-    devices = &info->devices[0];
-
-    trace_vfio_pci_hot_reset_has_dep_devices(vdev->vbasedev.name);
-
-    /* Verify that we have all the groups required */
-    for (i = 0; i < info->count; i++) {
-        PCIHostDeviceAddress host;
-        VFIOPCIDevice *tmp;
-        VFIODevice *vbasedev_iter;
-
-        host.domain = devices[i].segment;
-        host.bus = devices[i].bus;
-        host.slot = PCI_SLOT(devices[i].devfn);
-        host.function = PCI_FUNC(devices[i].devfn);
-
-        trace_vfio_pci_hot_reset_dep_devices(host.domain,
-                host.bus, host.slot, host.function, devices[i].group_id);
-
-        if (vfio_pci_host_match(&host, vdev->vbasedev.name)) {
-            continue;
-        }
-
-        QLIST_FOREACH(group, &vfio_group_list, next) {
-            if (group->groupid == devices[i].group_id) {
-                break;
-            }
-        }
-
-        if (!group) {
-            if (!vdev->has_pm_reset) {
-                error_report("vfio: Cannot reset device %s, "
-                             "depends on group %d which is not owned.",
-                             vdev->vbasedev.name, devices[i].group_id);
-            }
-            ret = -EPERM;
-            goto out;
-        }
-
-        /* Prep dependent devices for reset and clear our marker. */
-        QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
-            if (!vbasedev_iter->dev->realized ||
-                vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) {
-                continue;
-            }
-            tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev);
-            if (vfio_pci_host_match(&host, tmp->vbasedev.name)) {
-                if (single) {
-                    ret = -EINVAL;
-                    goto out_single;
-                }
-                vfio_pci_pre_reset(tmp);
-                tmp->vbasedev.needs_reset = false;
-                multi = true;
-                break;
-            }
-        }
-    }
-
-    if (!single && !multi) {
-        ret = -EINVAL;
-        goto out_single;
-    }
-
-    /* Determine how many group fds need to be passed */
-    count = 0;
-    QLIST_FOREACH(group, &vfio_group_list, next) {
-        for (i = 0; i < info->count; i++) {
-            if (group->groupid == devices[i].group_id) {
-                count++;
-                break;
-            }
-        }
-    }
-
-    reset = g_malloc0(sizeof(*reset) + (count * sizeof(*fds)));
-    reset->argsz = sizeof(*reset) + (count * sizeof(*fds));
-    fds = &reset->group_fds[0];
-
-    /* Fill in group fds */
-    QLIST_FOREACH(group, &vfio_group_list, next) {
-        for (i = 0; i < info->count; i++) {
-            if (group->groupid == devices[i].group_id) {
-                fds[reset->count++] = group->fd;
-                break;
-            }
-        }
-    }
-
-    /* Bus reset! */
-    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_PCI_HOT_RESET, reset);
-    g_free(reset);
-
-    trace_vfio_pci_hot_reset_result(vdev->vbasedev.name,
-                                    ret ? strerror(errno) : "Success");
-
-out:
-    /* Re-enable INTx on affected devices */
-    for (i = 0; i < info->count; i++) {
-        PCIHostDeviceAddress host;
-        VFIOPCIDevice *tmp;
-        VFIODevice *vbasedev_iter;
-
-        host.domain = devices[i].segment;
-        host.bus = devices[i].bus;
-        host.slot = PCI_SLOT(devices[i].devfn);
-        host.function = PCI_FUNC(devices[i].devfn);
-
-        if (vfio_pci_host_match(&host, vdev->vbasedev.name)) {
-            continue;
-        }
-
-        QLIST_FOREACH(group, &vfio_group_list, next) {
-            if (group->groupid == devices[i].group_id) {
-                break;
-            }
-        }
-
-        if (!group) {
-            break;
-        }
-
-        QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
-            if (!vbasedev_iter->dev->realized ||
-                vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) {
-                continue;
-            }
-            tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev);
-            if (vfio_pci_host_match(&host, tmp->vbasedev.name)) {
-                vfio_pci_post_reset(tmp);
-                break;
-            }
-        }
-    }
-out_single:
-    if (!single) {
-        vfio_pci_post_reset(vdev);
-    }
-    g_free(info);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+    const VFIOIOMMUOps *ops = vbasedev->bcontainer->ops;
 
-    return ret;
+    return ops->pci_hot_reset(vbasedev, single);
 }
 
 /*