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authorKirti Wankhede <kwankhede@nvidia.com>2016-11-16 23:46:27 +0300
committerAlex Williamson <alex.williamson@redhat.com>2016-11-17 18:33:20 +0300
commitc747f08aea847c8c0704acf9375ca83c4800f6c1 (patch)
treee5b811277ddd8b6faf1370ccb32a9af402b32819 /drivers/vfio
parentc535d34569bbc61ebf25a5505ab9eafba057345f (diff)
downloadlinux-c747f08aea847c8c0704acf9375ca83c4800f6c1.tar.xz
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.c48
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.