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authorKirti Wankhede <kwankhede@nvidia.com>2016-11-17 02:16:25 +0530
committerAlex Williamson <alex.williamson@redhat.com>2016-11-17 08:33:20 -0700
commitb3c0a866f1692da2d1059dadd9c429ff5b364fc9 (patch)
tree84442e9b18df0a2c6900aa3395800a095eecdea8 /drivers/vfio
parentc086de818dd81c3c2f7cecff23de6585b74340c0 (diff)
downloadlinux-b3c0a866f1692da2d1059dadd9c429ff5b364fc9.tar.bz2
vfio: Introduce common function to add capabilities
Vendor driver using mediated device framework should use vfio_info_add_capability() to add capabilities. Introduced this function to reduce code duplication in vendor drivers. vfio_info_cap_shift() manipulated a data buffer to add an offset to each element in a chain. This data buffer is documented in a uapi header. Changing vfio_info_cap_shift symbol to be available to all 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.c60
1 files changed, 59 insertions, 1 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 301eed07a0ab..bb3ddb76911f 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1797,8 +1797,66 @@ void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset)
for (tmp = caps->buf; tmp->next; tmp = (void *)tmp + tmp->next - offset)
tmp->next += offset;
}
-EXPORT_SYMBOL_GPL(vfio_info_cap_shift);
+EXPORT_SYMBOL(vfio_info_cap_shift);
+static int sparse_mmap_cap(struct vfio_info_cap *caps, void *cap_type)
+{
+ struct vfio_info_cap_header *header;
+ struct vfio_region_info_cap_sparse_mmap *sparse_cap, *sparse = cap_type;
+ size_t size;
+
+ size = sizeof(*sparse) + sparse->nr_areas * sizeof(*sparse->areas);
+ header = vfio_info_cap_add(caps, size,
+ VFIO_REGION_INFO_CAP_SPARSE_MMAP, 1);
+ if (IS_ERR(header))
+ return PTR_ERR(header);
+
+ sparse_cap = container_of(header,
+ struct vfio_region_info_cap_sparse_mmap, header);
+ sparse_cap->nr_areas = sparse->nr_areas;
+ memcpy(sparse_cap->areas, sparse->areas,
+ sparse->nr_areas * sizeof(*sparse->areas));
+ return 0;
+}
+
+static int region_type_cap(struct vfio_info_cap *caps, void *cap_type)
+{
+ struct vfio_info_cap_header *header;
+ struct vfio_region_info_cap_type *type_cap, *cap = cap_type;
+
+ header = vfio_info_cap_add(caps, sizeof(*cap),
+ VFIO_REGION_INFO_CAP_TYPE, 1);
+ if (IS_ERR(header))
+ return PTR_ERR(header);
+
+ type_cap = container_of(header, struct vfio_region_info_cap_type,
+ header);
+ type_cap->type = cap->type;
+ type_cap->subtype = cap->subtype;
+ return 0;
+}
+
+int vfio_info_add_capability(struct vfio_info_cap *caps, int cap_type_id,
+ void *cap_type)
+{
+ int ret = -EINVAL;
+
+ if (!cap_type)
+ return 0;
+
+ switch (cap_type_id) {
+ case VFIO_REGION_INFO_CAP_SPARSE_MMAP:
+ ret = sparse_mmap_cap(caps, cap_type);
+ break;
+
+ case VFIO_REGION_INFO_CAP_TYPE:
+ ret = region_type_cap(caps, cap_type);
+ break;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(vfio_info_add_capability);
/*
* Pin a set of guest PFNs and return their associated host PFNs for local