vfio/amba: Use the new device life cycle helpers

Implement amba's own vfio_device_ops.

Remove vfio_platform_probe/remove_common() given no user now.

Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20220921104401.38898-13-kevin.tian@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/platform/vfio_amba.c

@@ -7,6 +7,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/vfio.h>
+#include <linux/pm_runtime.h>
 #include <linux/amba/bus.h>
 
 #include "vfio_platform_private.h"
@@ -40,20 +41,16 @@ static int get_amba_irq(struct vfio_platform_device *vdev, int i)
 	return ret ? ret : -ENXIO;
 }
 
-static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
+static int vfio_amba_init_dev(struct vfio_device *core_vdev)
 {
-	struct vfio_platform_device *vdev;
+	struct vfio_platform_device *vdev =
+		container_of(core_vdev, struct vfio_platform_device, vdev);
+	struct amba_device *adev = to_amba_device(core_vdev->dev);
 	int ret;
 
-	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
-	if (!vdev)
-		return -ENOMEM;
-
 	vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
-	if (!vdev->name) {
+	if (!vdev->name)
-		kfree(vdev);
 		return -ENOMEM;
-	}
 
 	vdev->opaque = (void *) adev;
 	vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
@@ -61,26 +58,67 @@ static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
 	vdev->get_irq = get_amba_irq;
 	vdev->reset_required = false;
 
-	ret = vfio_platform_probe_common(vdev, &adev->dev);
+	ret = vfio_platform_init_common(vdev);
-	if (ret) {
+	if (ret)
 		kfree(vdev->name);
-		kfree(vdev);
 	return ret;
 }
 
+static const struct vfio_device_ops vfio_amba_ops;
+static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
+{
+	struct vfio_platform_device *vdev;
+	int ret;
+
+	vdev = vfio_alloc_device(vfio_platform_device, vdev, &adev->dev,
+				 &vfio_amba_ops);
+	if (IS_ERR(vdev))
+		return PTR_ERR(vdev);
+
+	ret = vfio_register_group_dev(&vdev->vdev);
+	if (ret)
+		goto out_put_vdev;
+
+	pm_runtime_enable(&adev->dev);
 	dev_set_drvdata(&adev->dev, vdev);
 	return 0;
+
+out_put_vdev:
+	vfio_put_device(&vdev->vdev);
+	return ret;
+}
+
+static void vfio_amba_release_dev(struct vfio_device *core_vdev)
+{
+	struct vfio_platform_device *vdev =
+		container_of(core_vdev, struct vfio_platform_device, vdev);
+
+	vfio_platform_release_common(vdev);
+	kfree(vdev->name);
+	vfio_free_device(core_vdev);
 }
 
 static void vfio_amba_remove(struct amba_device *adev)
 {
 	struct vfio_platform_device *vdev = dev_get_drvdata(&adev->dev);
 
-	vfio_platform_remove_common(vdev);
+	vfio_unregister_group_dev(&vdev->vdev);
-	kfree(vdev->name);
+	pm_runtime_disable(vdev->device);
-	kfree(vdev);
+	vfio_put_device(&vdev->vdev);
 }
 
+static const struct vfio_device_ops vfio_amba_ops = {
+	.name		= "vfio-amba",
+	.init		= vfio_amba_init_dev,
+	.release	= vfio_amba_release_dev,
+	.open_device	= vfio_platform_open_device,
+	.close_device	= vfio_platform_close_device,
+	.ioctl		= vfio_platform_ioctl,
+	.read		= vfio_platform_read,
+	.write		= vfio_platform_write,
+	.mmap		= vfio_platform_mmap,
+};
+
 static const struct amba_id pl330_ids[] = {
 	{ 0, 0 },
 };

drivers/vfio/platform/vfio_platform_common.c

@@ -605,16 +605,6 @@ int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma
 }
 EXPORT_SYMBOL_GPL(vfio_platform_mmap);
 
-static const struct vfio_device_ops vfio_platform_ops = {
-	.name		= "vfio-platform",
-	.open_device	= vfio_platform_open_device,
-	.close_device	= vfio_platform_close_device,
-	.ioctl		= vfio_platform_ioctl,
-	.read		= vfio_platform_read,
-	.write		= vfio_platform_write,
-	.mmap		= vfio_platform_mmap,
-};
-
 static int vfio_platform_of_probe(struct vfio_platform_device *vdev,
 			   struct device *dev)
 {
@@ -674,56 +664,6 @@ void vfio_platform_release_common(struct vfio_platform_device *vdev)
 }
 EXPORT_SYMBOL_GPL(vfio_platform_release_common);
 
-int vfio_platform_probe_common(struct vfio_platform_device *vdev,
-			       struct device *dev)
-{
-	int ret;
-
-	vfio_init_group_dev(&vdev->vdev, dev, &vfio_platform_ops);
-
-	ret = vfio_platform_acpi_probe(vdev, dev);
-	if (ret)
-		ret = vfio_platform_of_probe(vdev, dev);
-
-	if (ret)
-		goto out_uninit;
-
-	vdev->device = dev;
-
-	ret = vfio_platform_get_reset(vdev);
-	if (ret && vdev->reset_required) {
-		dev_err(dev, "No reset function found for device %s\n",
-			vdev->name);
-		goto out_uninit;
-	}
-
-	ret = vfio_register_group_dev(&vdev->vdev);
-	if (ret)
-		goto put_reset;
-
-	mutex_init(&vdev->igate);
-
-	pm_runtime_enable(dev);
-	return 0;
-
-put_reset:
-	vfio_platform_put_reset(vdev);
-out_uninit:
-	vfio_uninit_group_dev(&vdev->vdev);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
-
-void vfio_platform_remove_common(struct vfio_platform_device *vdev)
-{
-	vfio_unregister_group_dev(&vdev->vdev);
-
-	pm_runtime_disable(vdev->device);
-	vfio_platform_put_reset(vdev);
-	vfio_uninit_group_dev(&vdev->vdev);
-}
-EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
-
 void __vfio_platform_register_reset(struct vfio_platform_reset_node *node)
 {
 	mutex_lock(&driver_lock);

drivers/vfio/platform/vfio_platform_private.h

@@ -78,9 +78,6 @@ struct vfio_platform_reset_node {
 	vfio_platform_reset_fn_t of_reset;
 };
 
-int vfio_platform_probe_common(struct vfio_platform_device *vdev,
-			       struct device *dev);
-void vfio_platform_remove_common(struct vfio_platform_device *vdev);
 int vfio_platform_init_common(struct vfio_platform_device *vdev);
 void vfio_platform_release_common(struct vfio_platform_device *vdev);