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

Kevin Tian
2022-09-01T07:22:12Z

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);

--
2.21.3