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Subject[PATCH v9 07/12] vfio: Introduce vfio_set_irqs_validate_and_prepare()
Date
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>
Change-Id: Ie201f269dda0713ca18a07dc4852500bd8b48309
---
drivers/vfio/vfio.c | 39 +++++++++++++++++++++++++++++++++++++++
include/linux/vfio.h | 4 ++++
2 files changed, 43 insertions(+)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index e96cb3f7a23c..10ef1c5fa762 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1877,6 +1877,45 @@ int vfio_info_add_capability(struct vfio_region_info *info,
}
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;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if ((hdr->argsz < minsz) || (hdr->index >= max_irq_type) ||
+ (hdr->flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
+ VFIO_IRQ_SET_ACTION_TYPE_MASK)))
+ return -EINVAL;
+
+ if (data_size)
+ *data_size = 0;
+
+ if (!(hdr->flags & VFIO_IRQ_SET_DATA_NONE)) {
+ size_t size;
+
+ if (hdr->flags & VFIO_IRQ_SET_DATA_BOOL)
+ size = sizeof(uint8_t);
+ else if (hdr->flags & VFIO_IRQ_SET_DATA_EVENTFD)
+ size = sizeof(int32_t);
+ else
+ return -EINVAL;
+
+ if ((hdr->argsz - minsz < hdr->count * size) ||
+ (hdr->start >= num_irqs) ||
+ (hdr->start + hdr->count > num_irqs))
+ 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
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 854a4b40be02..31d059f1649b 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -112,6 +112,10 @@ extern int vfio_info_add_capability(struct vfio_region_info *info,
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);
--
2.7.0
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