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Commit 3eeb0d51 authored by Eric Auger's avatar Eric Auger Committed by Alex Williamson
Browse files

VFIO: platform: populate the reset function on probe 



The reset function lookup happens on vfio-platform probe. The reset
module load is requested  and a reference to the function symbol is
hold. The reference is released on vfio-platform remove.

Signed-off-by: default avatarEric Auger <eric.auger@linaro.org>
Acked-by: default avatarBaptiste Reynal <b.reynal@virtualopensystems.com>
Tested-by: default avatarBaptiste Reynal <b.reynal@virtualopensystems.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 813ae660

drivers/vfio/platform/vfio_platform_common.c

+36 −1
Original line number Diff line number Diff line
@@ -28,6 +28,36 @@ static DEFINE_MUTEX(driver_lock); 
static const struct vfio_platform_reset_combo reset_lookup_table[] = {

};



static void vfio_platform_get_reset(struct vfio_platform_device *vdev,

				    struct device *dev)

{

	const char *compat;

	int (*reset)(struct vfio_platform_device *);

	int ret, i;



	ret = device_property_read_string(dev, "compatible", &compat);

	if (ret)

		return;



	for (i = 0 ; i < ARRAY_SIZE(reset_lookup_table); i++) {

		if (!strcmp(reset_lookup_table[i].compat, compat)) {

			request_module(reset_lookup_table[i].module_name);

			reset = __symbol_get(

				reset_lookup_table[i].reset_function_name);

			if (reset) {

				vdev->reset = reset;

				return;

			}

		}

	}

}



static void vfio_platform_put_reset(struct vfio_platform_device *vdev)

{

	if (vdev->reset)

		symbol_put_addr(vdev->reset);

}



static int vfio_platform_regions_init(struct vfio_platform_device *vdev)

{

	int cnt = 0, i;
@@ -516,6 +546,8 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev, 
		return ret;

	}



	vfio_platform_get_reset(vdev, dev);



	mutex_init(&vdev->igate);



	return 0;
@@ -527,8 +559,11 @@ struct vfio_platform_device *vfio_platform_remove_common(struct device *dev) 
	struct vfio_platform_device *vdev;



	vdev = vfio_del_group_dev(dev);

	if (vdev)



	if (vdev) {

		vfio_platform_put_reset(vdev);

		iommu_group_put(dev->iommu_group);

	}



	return vdev;

}