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Commit c747f08a authored by Kirti Wankhede's avatar Kirti Wankhede Committed by Alex Williamson
Browse files

vfio: Introduce vfio_set_irqs_validate_and_prepare() 



Vendor driver using mediated device framework would use same mechnism to
validate and prepare IRQs. Introducing this function to reduce code
replication in multiple drivers.

Signed-off-by: default avatarKirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: default avatarNeo Jia <cjia@nvidia.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent c535d345

drivers/vfio/vfio.c

+48 −0
Original line number Diff line number Diff line
@@ -1858,6 +1858,54 @@ int vfio_info_add_capability(struct vfio_info_cap *caps, int cap_type_id, 
}

EXPORT_SYMBOL(vfio_info_add_capability);



int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr, int num_irqs,

				       int max_irq_type, size_t *data_size)

{

	unsigned long minsz;

	size_t size;



	minsz = offsetofend(struct vfio_irq_set, count);



	if ((hdr->argsz < minsz) || (hdr->index >= max_irq_type) ||

	    (hdr->count >= (U32_MAX - hdr->start)) ||

	    (hdr->flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |

				VFIO_IRQ_SET_ACTION_TYPE_MASK)))

		return -EINVAL;



	if (data_size)

		*data_size = 0;



	if (hdr->start >= num_irqs || hdr->start + hdr->count > num_irqs)

		return -EINVAL;



	switch (hdr->flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {

	case VFIO_IRQ_SET_DATA_NONE:

		size = 0;

		break;

	case VFIO_IRQ_SET_DATA_BOOL:

		size = sizeof(uint8_t);

		break;

	case VFIO_IRQ_SET_DATA_EVENTFD:

		size = sizeof(int32_t);

		break;

	default:

		return -EINVAL;

	}



	if (size) {

		if (hdr->argsz - minsz < hdr->count * size)

			return -EINVAL;



		if (!data_size)

			return -EINVAL;



		*data_size = hdr->count * size;

	}



	return 0;

}

EXPORT_SYMBOL(vfio_set_irqs_validate_and_prepare);



/*

 * Pin a set of guest PFNs and return their associated host PFNs for local

 * domain only.

include/linux/vfio.h

+4 −0
Original line number Diff line number Diff line
@@ -129,6 +129,10 @@ extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset); 
extern int vfio_info_add_capability(struct vfio_info_cap *caps,

				    int cap_type_id, void *cap_type);



extern int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,

					      int num_irqs, int max_irq_type,

					      size_t *data_size);



struct pci_dev;

#ifdef CONFIG_EEH

extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);