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vfio: platform: introduce vfio-platform-base module 

To prepare for vfio platform reset rework let's build
vfio_platform_common.c and vfio_platform_irq.c in a separate
module from vfio-platform and vfio-amba. This makes possible
to have separate module inits and works around a race between
platform driver init and vfio reset module init: that way we
make sure symbols exported by base are available when vfio-platform
driver gets probed.

The open/release being implemented in the base module, the ref
count is applied to the parent module instead.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Auger 2015-11-03 18:12:12 +00:00 committed by Alex Williamson
parent 1b4bb2eaa9
commit 32a2d71c4e
5 changed files with 18 additions and 4 deletions
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6
drivers/vfio/platform/Makefile
View File

@ -1,10 +1,12 @@
vfio-platform-y := vfio_platform.o vfio_platform_common.o vfio_platform_irq.o
vfio-platform-base-y := vfio_platform_common.o vfio_platform_irq.o
vfio-platform-y := vfio_platform.o
obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform-base.o
obj-$(CONFIG_VFIO_PLATFORM) += reset/
vfio-amba-y := vfio_amba.o
obj-$(CONFIG_VFIO_AMBA) += vfio-amba.o
obj-$(CONFIG_VFIO_AMBA) += vfio-platform-base.o
obj-$(CONFIG_VFIO_AMBA) += reset/

1
drivers/vfio/platform/vfio_amba.c
View File

@ -67,6 +67,7 @@ static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
vdev->get_resource = get_amba_resource;
vdev->get_irq = get_amba_irq;
vdev->parent_module = THIS_MODULE;
ret = vfio_platform_probe_common(vdev, &adev->dev);
if (ret) {

1
drivers/vfio/platform/vfio_platform.c
View File

@ -65,6 +65,7 @@ static int vfio_platform_probe(struct platform_device *pdev)
vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
vdev->get_resource = get_platform_resource;
vdev->get_irq = get_platform_irq;
vdev->parent_module = THIS_MODULE;
ret = vfio_platform_probe_common(vdev, &pdev->dev);
if (ret)

13
drivers/vfio/platform/vfio_platform_common.c
View File

@ -23,6 +23,10 @@
#include "vfio_platform_private.h"
#define DRIVER_VERSION "0.10"
#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
#define DRIVER_DESC "VFIO platform base module"
static DEFINE_MUTEX(driver_lock);
static const struct vfio_platform_reset_combo reset_lookup_table[] = {
@ -146,7 +150,7 @@ static void vfio_platform_release(void *device_data)
mutex_unlock(&driver_lock);
module_put(THIS_MODULE);
module_put(vdev->parent_module);
}
static int vfio_platform_open(void *device_data)
@ -154,7 +158,7 @@ static int vfio_platform_open(void *device_data)
struct vfio_platform_device *vdev = device_data;
int ret;
if (!try_module_get(THIS_MODULE))
if (!try_module_get(vdev->parent_module))
return -ENODEV;
mutex_lock(&driver_lock);
@ -573,3 +577,8 @@ struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
return vdev;
}
EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);

1
drivers/vfio/platform/vfio_platform_private.h
View File

@ -56,6 +56,7 @@ struct vfio_platform_device {
u32 num_irqs;
int refcnt;
struct mutex igate;
struct module *parent_module;
/*
* These fields should be filled by the bus specific binder