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| author | Kirti Wankhede <kwankhede@nvidia.com> | 2016-11-17 02:16:27 +0530 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2016-11-17 08:33:20 -0700 |
| commit | c747f08aea847c8c0704acf9375ca83c4800f6c1 (patch) | |
| tree | e5b811277ddd8b6faf1370ccb32a9af402b32819 /drivers/vfio | |
| parent | c535d34569bbc61ebf25a5505ab9eafba057345f (diff) | |
| download | linux-c747f08aea847c8c0704acf9375ca83c4800f6c1.tar.gz linux-c747f08aea847c8c0704acf9375ca83c4800f6c1.tar.bz2 linux-c747f08aea847c8c0704acf9375ca83c4800f6c1.zip | |
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>
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index bb3ddb76911f..c8150674787c 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -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. |