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iommu/uapi: Add argsz for user filled data 

As IOMMU UAPI gets extended, user data size may increase. To support
backward compatibiliy, this patch introduces a size field to each UAPI
data structures. It is *always* the responsibility for the user to fill in
the correct size. Padding fields are adjusted to ensure 8 byte alignment.

Specific scenarios for user data handling are documented in:
Documentation/userspace-api/iommu.rst

As there is no current users of the API, struct version is not
incremented.

Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/1601051567-54787-3-git-send-email-jacob.jun.pan@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jacob Pan 2020-09-25 09:32:43 -07:00 committed by Joerg Roedel
parent d0023e3ee2
commit 1e6aaae93e
1 changed files with 9 additions and 3 deletions
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12
include/uapi/linux/iommu.h
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@ -139,6 +139,7 @@ enum iommu_page_response_code {
/**
* struct iommu_page_response - Generic page response information
* @argsz: User filled size of this data
* @version: API version of this structure
* @flags: encodes whether the corresponding fields are valid
* (IOMMU_FAULT_PAGE_RESPONSE_* values)
@ -147,6 +148,7 @@ enum iommu_page_response_code {
* @code: response code from &enum iommu_page_response_code
*/
struct iommu_page_response {
__u32 argsz;
#define IOMMU_PAGE_RESP_VERSION_1 1
__u32 version;
#define IOMMU_PAGE_RESP_PASID_VALID (1 << 0)
@ -222,6 +224,7 @@ struct iommu_inv_pasid_info {
/**
* struct iommu_cache_invalidate_info - First level/stage invalidation
* information
* @argsz: User filled size of this data
* @version: API version of this structure
* @cache: bitfield that allows to select which caches to invalidate
* @granularity: defines the lowest granularity used for the invalidation:
@ -250,6 +253,7 @@ struct iommu_inv_pasid_info {
* must support the used granularity.
*/
struct iommu_cache_invalidate_info {
__u32 argsz;
#define IOMMU_CACHE_INVALIDATE_INFO_VERSION_1 1
__u32 version;
/* IOMMU paging structure cache */
@ -259,7 +263,7 @@ struct iommu_cache_invalidate_info {
#define IOMMU_CACHE_INV_TYPE_NR (3)
__u8 cache;
__u8 granularity;
__u8 padding[2];
__u8 padding[6];
union {
struct iommu_inv_pasid_info pasid_info;
struct iommu_inv_addr_info addr_info;
@ -296,6 +300,7 @@ struct iommu_gpasid_bind_data_vtd {
/**
* struct iommu_gpasid_bind_data - Information about device and guest PASID binding
* @argsz: User filled size of this data
* @version: Version of this data structure
* @format: PASID table entry format
* @flags: Additional information on guest bind request
@ -313,17 +318,18 @@ struct iommu_gpasid_bind_data_vtd {
* PASID to host PASID based on this bind data.
*/
struct iommu_gpasid_bind_data {
__u32 argsz;
#define IOMMU_GPASID_BIND_VERSION_1 1
__u32 version;
#define IOMMU_PASID_FORMAT_INTEL_VTD 1
__u32 format;
__u32 addr_width;
#define IOMMU_SVA_GPASID_VAL (1 << 0) /* guest PASID valid */
__u64 flags;
__u64 gpgd;
__u64 hpasid;
__u64 gpasid;
__u32 addr_width;
__u8 padding[12];
__u8 padding[8];
/* Vendor specific data */
union {
struct iommu_gpasid_bind_data_vtd vtd;