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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: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Neo Jia <cjia@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2016-11-17 02:16:27 +05:30 committed by Alex Williamson
parent c535d34569
commit c747f08aea
2 changed files with 52 additions and 0 deletions
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48
drivers/vfio/vfio.c
View File

@ -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.

4
include/linux/vfio.h
View File

@ -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);