From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: iommu@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
Joerg Roedel <joro@8bytes.org>,
Alex Williamson <alex.williamson@redhat.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
Raj Ashok <ashok.raj@intel.com>, Jonathan Corbet <corbet@lwn.net>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
Christoph Hellwig <hch@infradead.org>,
David Woodhouse <dwmw2@infradead.org>
Subject: [PATCH v7 2/7] iommu/uapi: Add argsz for user filled data
Date: Wed, 29 Jul 2020 17:21:02 -0700 [thread overview]
Message-ID: <1596068467-49322-3-git-send-email-jacob.jun.pan@linux.intel.com> (raw)
In-Reply-To: <1596068467-49322-1-git-send-email-jacob.jun.pan@linux.intel.com>
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
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
include/uapi/linux/iommu.h | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
index e907b7091a46..d5e9014f690e 100644
--- a/include/uapi/linux/iommu.h
+++ b/include/uapi/linux/iommu.h
@@ -135,6 +135,7 @@ 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)
@@ -143,6 +144,7 @@ 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)
@@ -218,6 +220,7 @@ 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:
@@ -246,6 +249,7 @@ 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 */
@@ -255,7 +259,7 @@ 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;
@@ -292,6 +296,7 @@ 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
@@ -309,17 +314,18 @@ 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;
--
2.7.4
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-07-30 0:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-30 0:21 [PATCH v7 0/7] IOMMU user API enhancement Jacob Pan
2020-07-30 0:21 ` [PATCH v7 1/7] docs: IOMMU user API Jacob Pan
2020-08-12 16:38 ` Auger Eric
2020-08-17 22:07 ` Jacob Pan
2020-07-30 0:21 ` Jacob Pan [this message]
2020-08-12 16:59 ` [PATCH v7 2/7] iommu/uapi: Add argsz for user filled data Auger Eric
2020-08-17 22:48 ` Jacob Pan
2020-07-30 0:21 ` [PATCH v7 3/7] iommu/uapi: Introduce enum type for PASID data format Jacob Pan
2020-08-13 9:29 ` Auger Eric
2020-07-30 0:21 ` [PATCH v7 4/7] iommu/uapi: Use named union for user data Jacob Pan
2020-07-30 0:21 ` [PATCH v7 5/7] iommu/uapi: Rename uapi functions Jacob Pan
2020-08-13 8:58 ` Auger Eric
2020-08-17 23:16 ` Jacob Pan
2020-07-30 0:21 ` [PATCH v7 6/7] iommu/uapi: Handle data and argsz filled by users Jacob Pan
2020-08-13 9:11 ` Auger Eric
2020-08-13 9:25 ` Liu, Yi L
2020-08-13 9:30 ` Auger Eric
2020-08-13 9:38 ` Liu, Yi L
2020-08-13 10:03 ` Auger Eric
2020-07-30 0:21 ` [PATCH v7 7/7] iommu/vt-d: Check UAPI data processed by IOMMU core Jacob Pan
2020-08-13 9:19 ` Auger Eric
2020-08-31 17:52 ` Jacob Pan
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