vfio/platform: Use the new device life cycle helpers

Move vfio_device_ops from platform core to platform drivers so device
specific init/cleanup can be added.

Introduce two new helpers vfio_platform_init/release_common() for the
use in driver @init/@release.

vfio_platform_probe/remove_common() will be deprecated.

Signed-off-by: Kevin Tian <[e-mail]>
Reviewed-by: Jason Gunthorpe <[e-mail]>
Reviewed-by: Eric Auger <[e-mail]>
Tested-by: Eric Auger <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alex Williamson <[e-mail]>

drivers/vfio/platform/vfio_platform.c

···
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/vfio.h>
+#include <linux/pm_runtime.h>
 #include <linux/platform_device.h>
 
 #include "vfio_platform_private.h"
···
 	return platform_get_irq_optional(pdev, i);
 }
 
-static int vfio_platform_probe(struct platform_device *pdev)
+static int vfio_platform_init_dev(struct vfio_device *core_vdev)
 {
-	struct vfio_platform_device *vdev;
-	int ret;
-
-	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
-	if (!vdev)
-		return -ENOMEM;
+	struct vfio_platform_device *vdev =
+		container_of(core_vdev, struct vfio_platform_device, vdev);
+	struct platform_device *pdev = to_platform_device(core_vdev->dev);
 
 	vdev->opaque = (void *) pdev;
 	vdev->name = pdev->name;
···
 	vdev->get_irq = get_platform_irq;
 	vdev->reset_required = reset_required;
 
-	ret = vfio_platform_probe_common(vdev, &pdev->dev);
-	if (ret) {
-		kfree(vdev);
-		return ret;
-	}
+	return vfio_platform_init_common(vdev);
+}
+
+static const struct vfio_device_ops vfio_platform_ops;
+static int vfio_platform_probe(struct platform_device *pdev)
+{
+	struct vfio_platform_device *vdev;
+	int ret;
+
+	vdev = vfio_alloc_device(vfio_platform_device, vdev, &pdev->dev,
+				 &vfio_platform_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(&pdev->dev);
 	dev_set_drvdata(&pdev->dev, vdev);
 	return 0;
+
+out_put_vdev:
+	vfio_put_device(&vdev->vdev);
+	return ret;
+}
+
+static void vfio_platform_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);
+	vfio_free_device(core_vdev);
 }
 
 static int vfio_platform_remove(struct platform_device *pdev)
 {
 	struct vfio_platform_device *vdev = dev_get_drvdata(&pdev->dev);
 
-	vfio_platform_remove_common(vdev);
-	kfree(vdev);
+	vfio_unregister_group_dev(&vdev->vdev);
+	pm_runtime_disable(vdev->device);
+	vfio_put_device(&vdev->vdev);
 	return 0;
 }
+
+static const struct vfio_device_ops vfio_platform_ops = {
+	.name		= "vfio-platform",
+	.init		= vfio_platform_init_dev,
+	.release	= vfio_platform_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 struct platform_driver vfio_platform_driver = {
 	.probe		= vfio_platform_probe,

drivers/vfio/platform/vfio_platform_common.c

···
 	return -EINVAL;
 }
 
-static void vfio_platform_close_device(struct vfio_device *core_vdev)
+void vfio_platform_close_device(struct vfio_device *core_vdev)
 {
 	struct vfio_platform_device *vdev =
 		container_of(core_vdev, struct vfio_platform_device, vdev);
···
 	vfio_platform_regions_cleanup(vdev);
 	vfio_platform_irq_cleanup(vdev);
 }
+EXPORT_SYMBOL_GPL(vfio_platform_close_device);
 
-static int vfio_platform_open_device(struct vfio_device *core_vdev)
+int vfio_platform_open_device(struct vfio_device *core_vdev)
 {
 	struct vfio_platform_device *vdev =
 		container_of(core_vdev, struct vfio_platform_device, vdev);
···
 	vfio_platform_regions_cleanup(vdev);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(vfio_platform_open_device);
 
-static long vfio_platform_ioctl(struct vfio_device *core_vdev,
-				unsigned int cmd, unsigned long arg)
+long vfio_platform_ioctl(struct vfio_device *core_vdev,
+			 unsigned int cmd, unsigned long arg)
 {
 	struct vfio_platform_device *vdev =
 		container_of(core_vdev, struct vfio_platform_device, vdev);
···
 
 	return -ENOTTY;
 }
+EXPORT_SYMBOL_GPL(vfio_platform_ioctl);
 
 static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
 				       char __user *buf, size_t count,
···
 	return -EFAULT;
 }
 
-static ssize_t vfio_platform_read(struct vfio_device *core_vdev,
-				  char __user *buf, size_t count, loff_t *ppos)
+ssize_t vfio_platform_read(struct vfio_device *core_vdev,
+			   char __user *buf, size_t count, loff_t *ppos)
 {
 	struct vfio_platform_device *vdev =
 		container_of(core_vdev, struct vfio_platform_device, vdev);
···
 
 	return -EINVAL;
 }
+EXPORT_SYMBOL_GPL(vfio_platform_read);
 
 static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
 					const char __user *buf, size_t count,
···
 	return -EFAULT;
 }
 
-static ssize_t vfio_platform_write(struct vfio_device *core_vdev, const char __user *buf,
-				   size_t count, loff_t *ppos)
+ssize_t vfio_platform_write(struct vfio_device *core_vdev, const char __user *buf,
+			    size_t count, loff_t *ppos)
 {
 	struct vfio_platform_device *vdev =
 		container_of(core_vdev, struct vfio_platform_device, vdev);
···
 
 	return -EINVAL;
 }
+EXPORT_SYMBOL_GPL(vfio_platform_write);
 
 static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
 				   struct vm_area_struct *vma)
···
 			       req_len, vma->vm_page_prot);
 }
 
-static int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
+int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
 {
 	struct vfio_platform_device *vdev =
 		container_of(core_vdev, struct vfio_platform_device, vdev);
···
 
 	return -EINVAL;
 }
+EXPORT_SYMBOL_GPL(vfio_platform_mmap);
 
 static const struct vfio_device_ops vfio_platform_ops = {
 	.name		= "vfio-platform",
···
  * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are
  * valid checks. We cannot claim that this system is DT.
  */
+int vfio_platform_init_common(struct vfio_platform_device *vdev)
+{
+	int ret;
+	struct device *dev = vdev->vdev.dev;
+
+	ret = vfio_platform_acpi_probe(vdev, dev);
+	if (ret)
+		ret = vfio_platform_of_probe(vdev, dev);
+
+	if (ret)
+		return ret;
+
+	vdev->device = dev;
+	mutex_init(&vdev->igate);
+
+	ret = vfio_platform_get_reset(vdev);
+	if (ret && vdev->reset_required)
+		dev_err(dev, "No reset function found for device %s\n",
+			vdev->name);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(vfio_platform_init_common);
+
+void vfio_platform_release_common(struct vfio_platform_device *vdev)
+{
+	vfio_platform_put_reset(vdev);
+}
+EXPORT_SYMBOL_GPL(vfio_platform_release_common);
+
 int vfio_platform_probe_common(struct vfio_platform_device *vdev,
 			       struct device *dev)
 {

drivers/vfio/platform/vfio_platform_private.h

···
 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);
+
+int vfio_platform_open_device(struct vfio_device *core_vdev);
+void vfio_platform_close_device(struct vfio_device *core_vdev);
+long vfio_platform_ioctl(struct vfio_device *core_vdev,
+			 unsigned int cmd, unsigned long arg);
+ssize_t vfio_platform_read(struct vfio_device *core_vdev,
+			   char __user *buf, size_t count,
+			   loff_t *ppos);
+ssize_t vfio_platform_write(struct vfio_device *core_vdev,
+			    const char __user *buf,
+			    size_t count, loff_t *ppos);
+int vfio_platform_mmap(struct vfio_device *core_vdev,
+		       struct vm_area_struct *vma);
 
 int vfio_platform_irq_init(struct vfio_platform_device *vdev);
 void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);