[PATCH v4 11/15] vfio/platform: Use the new device life cycle helpers

From: Kevin Tian
Date: Tue Sep 20 2022 - 23:28:53 EST

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 <kevin.tian@xxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Tested-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
drivers/vfio/platform/vfio_platform.c | 66 +++++++++++++++----
drivers/vfio/platform/vfio_platform_common.c | 53 ++++++++++++---
drivers/vfio/platform/vfio_platform_private.h | 15 +++++
3 files changed, 111 insertions(+), 23 deletions(-)

diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index 04f40c5acfd6..82cedcebfd90 100644
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -7,6 +7,7 @@
#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"
@@ -36,14 +37,11 @@ static int get_platform_irq(struct vfio_platform_device *vdev, int i)
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;
@@ -52,24 +50,64 @@ static int vfio_platform_probe(struct platform_device *pdev)
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,
.remove = vfio_platform_remove,
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 256f55b84e70..4c01bf0adebb 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -218,7 +218,7 @@ static int vfio_platform_call_reset(struct vfio_platform_device *vdev,
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);
@@ -236,8 +236,9 @@ static void vfio_platform_close_device(struct vfio_device *core_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);
@@ -273,9 +274,10 @@ static int vfio_platform_open_device(struct vfio_device *core_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);
@@ -382,6 +384,7 @@ static long vfio_platform_ioctl(struct vfio_device *core_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,
@@ -438,8 +441,8 @@ static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
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);
@@ -460,6 +463,7 @@ static ssize_t vfio_platform_read(struct vfio_device *core_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,
@@ -515,8 +519,8 @@ static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
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);
@@ -537,6 +541,7 @@ static ssize_t vfio_platform_write(struct vfio_device *core_vdev, const char __u

return -EINVAL;
}
+EXPORT_SYMBOL_GPL(vfio_platform_write);

static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
struct vm_area_struct *vma)
@@ -558,7 +563,7 @@ static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
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);
@@ -598,6 +603,7 @@ static int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_stru

return -EINVAL;
}
+EXPORT_SYMBOL_GPL(vfio_platform_mmap);

static const struct vfio_device_ops vfio_platform_ops = {
.name = "vfio-platform",
@@ -639,6 +645,35 @@ static int vfio_platform_of_probe(struct vfio_platform_device *vdev,
* 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)
{
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index 691b43f4b2b2..a769d649fb97 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -81,6 +81,21 @@ struct vfio_platform_reset_node {
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);
--
2.21.3