Re: [PATCH v2 12/15] vfio/amba: Use the new device life cycle helpers

Eric Auger
2022-09-07T19:32:16Z

Hi Kevin,

On 9/1/22 16:37, Kevin Tian wrote:
> 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>
> ---
> drivers/vfio/platform/vfio_amba.c | 72 ++++++++++++++-----
> drivers/vfio/platform/vfio_platform_common.c | 60 ----------------
> drivers/vfio/platform/vfio_platform_private.h | 3 -
> 3 files changed, 55 insertions(+), 80 deletions(-)
>
> diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
> index 1aaa4f721bd2..6cdcc8905198 100644
> --- a/drivers/vfio/platform/vfio_amba.c
> +++ b/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) {
> - kfree(vdev);
> + if (!vdev->name)
> 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);
> - if (ret) {
> + ret = vfio_platform_init_common(vdev);
> + if (ret)
> kfree(vdev->name);
> - kfree(vdev);
> - return ret;
> - }
> + 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);
> - kfree(vdev->name);
> - kfree(vdev);
> + vfio_unregister_group_dev(&vdev->vdev);
> + pm_runtime_disable(vdev->device);
> + 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 },
> };
> diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
> index 4c01bf0adebb..55dc4f43c31e 100644
> --- a/drivers/vfio/platform/vfio_platform_common.c
> +++ b/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);
> diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
> index a769d649fb97..8d8fab516849 100644
> --- a/drivers/vfio/platform/vfio_platform_private.h
> +++ b/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);
>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric