[Qemu-devel] [PATCH v3 13/16] vfio/pci: Conversion to realize

[Eric Auger <eric.auger@redhat.com>]

This patch converts VFIO PCI to realize function.

Also original initfn errors now are propagated using QEMU
error objects. All errors are formatted with the same pattern:
"vfio: %s: the error description"

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v2 -> v3:
- use errp directly in all cases

v1 -> v2:
- correct error_setg_errno with positive error values
---
 hw/vfio/pci.c        | 68 ++++++++++++++++++++++------------------------------
 hw/vfio/trace-events |  2 +-
 2 files changed, 29 insertions(+), 41 deletions(-)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 40ff4a7..b316e13 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2513,13 +2513,12 @@ static void vfio_unregister_req_notifier(VFIOPCIDevice *vdev)
     vdev->req_enabled = false;
 }
 
-static int vfio_initfn(PCIDevice *pdev)
+static void vfio_realize(PCIDevice *pdev, Error **errp)
 {
     VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
     VFIODevice *vbasedev_iter;
     VFIOGroup *group;
     char *tmp, group_path[PATH_MAX], *group_name;
-    Error *err = NULL;
     ssize_t len;
     struct stat st;
     int groupid;
@@ -2533,9 +2532,9 @@ static int vfio_initfn(PCIDevice *pdev)
     }
 
     if (stat(vdev->vbasedev.sysfsdev, &st) < 0) {
-        error_setg_errno(&err, errno, "no such host device");
-        ret = -errno;
-        goto error;
+        error_setg_errno(errp, errno, "no such host device");
+        error_prepend(errp, ERR_PREFIX, vdev->vbasedev.sysfsdev);
+        return;
     }
 
     vdev->vbasedev.name = g_strdup(basename(vdev->vbasedev.sysfsdev));
@@ -2547,8 +2546,8 @@ static int vfio_initfn(PCIDevice *pdev)
     g_free(tmp);
 
     if (len <= 0 || len >= sizeof(group_path)) {
-        ret = len < 0 ? -errno : -ENAMETOOLONG;
-        error_setg_errno(&err, -ret, "no iommu_group found");
+        error_setg_errno(errp, len < 0 ? errno : ENAMETOOLONG,
+                         "no iommu_group found");
         goto error;
     }
 
@@ -2556,36 +2555,33 @@ static int vfio_initfn(PCIDevice *pdev)
 
     group_name = basename(group_path);
     if (sscanf(group_name, "%d", &groupid) != 1) {
-        error_setg_errno(&err, errno, "failed to read %s", group_path);
-        ret = -errno;
+        error_setg_errno(errp, errno, "failed to read %s", group_path);
         goto error;
     }
 
-    trace_vfio_initfn(vdev->vbasedev.name, groupid);
+    trace_vfio_realize(vdev->vbasedev.name, groupid);
 
-    group = vfio_get_group(groupid, pci_device_iommu_address_space(pdev), &err);
+    group = vfio_get_group(groupid, pci_device_iommu_address_space(pdev), errp);
     if (!group) {
-        ret = -ENOENT;
         goto error;
     }
 
     QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
         if (strcmp(vbasedev_iter->name, vdev->vbasedev.name) == 0) {
-            error_setg(&err, "device is already attached");
+            error_setg(errp, "device is already attached");
             vfio_put_group(group);
-            ret = -EBUSY;
             goto error;
         }
     }
 
-    ret = vfio_get_device(group, vdev->vbasedev.name, &vdev->vbasedev, &err);
+    ret = vfio_get_device(group, vdev->vbasedev.name, &vdev->vbasedev, errp);
     if (ret) {
         vfio_put_group(group);
         goto error;
     }
 
-    ret = vfio_populate_device(vdev, &err);
-    if (err) {
+    ret = vfio_populate_device(vdev, errp);
+    if (ret) {
         goto error;
     }
 
@@ -2595,7 +2591,7 @@ static int vfio_initfn(PCIDevice *pdev)
                 vdev->config_offset);
     if (ret < (int)MIN(pci_config_size(&vdev->pdev), vdev->config_size)) {
         ret = ret < 0 ? -errno : -EFAULT;
-        error_setg_errno(&err, -ret, "failed to read device config space");
+        error_setg_errno(errp, -ret, "failed to read device config space");
         goto error;
     }
 
@@ -2612,8 +2608,7 @@ static int vfio_initfn(PCIDevice *pdev)
      */
     if (vdev->vendor_id != PCI_ANY_ID) {
         if (vdev->vendor_id >= 0xffff) {
-            error_setg(&err, "invalid PCI vendor ID provided");
-            ret = -EINVAL;
+            error_setg(errp, "invalid PCI vendor ID provided");
             goto error;
         }
         vfio_add_emulated_word(vdev, PCI_VENDOR_ID, vdev->vendor_id, ~0);
@@ -2624,8 +2619,7 @@ static int vfio_initfn(PCIDevice *pdev)
 
     if (vdev->device_id != PCI_ANY_ID) {
         if (vdev->device_id > 0xffff) {
-            error_setg(&err, "invalid PCI device ID provided");
-            ret = -EINVAL;
+            error_setg(errp, "invalid PCI device ID provided");
             goto error;
         }
         vfio_add_emulated_word(vdev, PCI_DEVICE_ID, vdev->device_id, ~0);
@@ -2636,8 +2630,7 @@ static int vfio_initfn(PCIDevice *pdev)
 
     if (vdev->sub_vendor_id != PCI_ANY_ID) {
         if (vdev->sub_vendor_id > 0xffff) {
-            error_setg(&err, "invalid PCI subsystem vendor ID provided");
-            ret = -EINVAL;
+            error_setg(errp, "invalid PCI subsystem vendor ID provided");
             goto error;
         }
         vfio_add_emulated_word(vdev, PCI_SUBSYSTEM_VENDOR_ID,
@@ -2648,8 +2641,7 @@ static int vfio_initfn(PCIDevice *pdev)
 
     if (vdev->sub_device_id != PCI_ANY_ID) {
         if (vdev->sub_device_id > 0xffff) {
-            error_setg(&err, "invalid PCI subsystem device ID provided");
-            ret = -EINVAL;
+            error_setg(errp, "invalid PCI subsystem device ID provided");
             goto error;
         }
         vfio_add_emulated_word(vdev, PCI_SUBSYSTEM_ID, vdev->sub_device_id, ~0);
@@ -2678,14 +2670,14 @@ static int vfio_initfn(PCIDevice *pdev)
 
     vfio_pci_size_rom(vdev);
 
-    ret = vfio_msix_early_setup(vdev, &err);
-    if (err) {
+    ret = vfio_msix_early_setup(vdev, errp);
+    if (ret) {
         goto error;
     }
 
     vfio_bars_setup(vdev);
 
-    ret = vfio_add_capabilities(vdev, &err);
+    ret = vfio_add_capabilities(vdev, errp);
     if (ret) {
         goto out_teardown;
     }
@@ -2703,10 +2695,9 @@ static int vfio_initfn(PCIDevice *pdev)
         struct vfio_region_info *opregion;
 
         if (vdev->pdev.qdev.hotplugged) {
-            error_setg(&err,
+            error_setg(errp,
                        "cannot support IGD OpRegion feature on hotplugged "
                        "device");
-            ret = -EINVAL;
             goto out_teardown;
         }
 
@@ -2714,12 +2705,12 @@ static int vfio_initfn(PCIDevice *pdev)
                         VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL,
                         VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION, &opregion);
         if (ret) {
-            error_setg_errno(&err, -ret,
+            error_setg_errno(errp, -ret,
                              "does not support requested IGD OpRegion feature");
             goto out_teardown;
         }
 
-        ret = vfio_pci_igd_opregion_init(vdev, opregion, &err);
+        ret = vfio_pci_igd_opregion_init(vdev, opregion, errp);
         g_free(opregion);
         if (ret) {
             goto out_teardown;
@@ -2741,7 +2732,7 @@ static int vfio_initfn(PCIDevice *pdev)
         vdev->intx.mmap_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
                                                   vfio_intx_mmap_enable, vdev);
         pci_device_set_intx_routing_notifier(&vdev->pdev, vfio_intx_update);
-        ret = vfio_intx_enable(vdev, &err);
+        ret = vfio_intx_enable(vdev, errp);
         if (ret) {
             goto out_teardown;
         }
@@ -2751,17 +2742,14 @@ static int vfio_initfn(PCIDevice *pdev)
     vfio_register_req_notifier(vdev);
     vfio_setup_resetfn_quirk(vdev);
 
-    return 0;
+    return;
 
 out_teardown:
     pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
     vfio_teardown_msi(vdev);
     vfio_bars_exit(vdev);
 error:
-    if (err) {
-        error_reportf_err(err, ERR_PREFIX, vdev->vbasedev.name);
-    }
-    return ret;
+    error_prepend(errp, ERR_PREFIX, vdev->vbasedev.name);
 }
 
 static void vfio_instance_finalize(Object *obj)
@@ -2890,7 +2878,7 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
     dc->vmsd = &vfio_pci_vmstate;
     dc->desc = "VFIO-based PCI device assignment";
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
-    pdc->init = vfio_initfn;
+    pdc->realize = vfio_realize;
     pdc->exit = vfio_exitfn;
     pdc->config_read = vfio_pci_read_config;
     pdc->config_write = vfio_pci_write_config;
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index da13322..ef81609 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -36,7 +36,7 @@ vfio_pci_hot_reset_dep_devices(int domain, int bus, int slot, int function, int
 vfio_pci_hot_reset_result(const char *name, const char *result) "%s hot reset: %s"
 vfio_populate_device_config(const char *name, unsigned long size, unsigned long offset, unsigned long flags) "Device %s config:\n  size: 0x%lx, offset: 0x%lx, flags: 0x%lx"
 vfio_populate_device_get_irq_info_failure(void) "VFIO_DEVICE_GET_IRQ_INFO failure: %m"
-vfio_initfn(const char *name, int group_id) " (%s) group %d"
+vfio_realize(const char *name, int group_id) " (%s) group %d"
 vfio_add_ext_cap_dropped(const char *name, uint16_t cap, uint16_t offset) "%s %x@%x"
 vfio_pci_reset(const char *name) " (%s)"
 vfio_pci_reset_flr(const char *name) "%s FLR/VFIO_DEVICE_RESET"
-- 
1.9.1