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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>
This commit is contained in:
Kirti Wankhede 2016-11-17 02:16:25 +05:30 committed by Alex Williamson
parent c086de818d
commit b3c0a866f1
2 changed files with 62 additions and 1 deletions
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60
drivers/vfio/vfio.c
View File

@ -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

3
include/linux/vfio.h
View File

@ -126,6 +126,9 @@ extern struct vfio_info_cap_header *vfio_info_cap_add(
struct vfio_info_cap *caps, size_t size, u16 id, u16 version);
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);
struct pci_dev;
#ifdef CONFIG_EEH
extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);