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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 v3 2/5] iommu/uapi: Add argsz for user filled data
Date: Tue, 23 Jun 2020 10:03:54 -0700	[thread overview]
Message-ID: <1592931837-58223-3-git-send-email-jacob.jun.pan@linux.intel.com> (raw)
In-Reply-To: <1592931837-58223-1-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.

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 | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
index e907b7091a46..303f148a5cd7 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 */
@@ -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
@@ -309,6 +314,7 @@ 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
-- 
2.7.4

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  parent reply	other threads:[~2020-06-23 16:57 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-23 17:03 [PATCH v3 0/5] IOMMU user API enhancement Jacob Pan
2020-06-23 17:03 ` [PATCH v3 1/5] docs: IOMMU user API Jacob Pan
2020-06-26 22:19   ` Alex Williamson
2020-06-29 23:05     ` Jacob Pan
2020-06-30  2:52       ` Tian, Kevin
2020-06-30 17:39         ` Jacob Pan
2020-07-07 21:40       ` Alex Williamson
2020-07-08 15:21         ` Jacob Pan
2020-06-23 17:03 ` Jacob Pan [this message]
2020-06-23 17:03 ` [PATCH v3 3/5] iommu/uapi: Use named union for user data Jacob Pan
2020-06-24  6:29   ` Lu Baolu
2020-06-24 15:48     ` Jacob Pan
2020-06-23 17:03 ` [PATCH v3 4/5] iommu/uapi: Handle data and argsz filled by users Jacob Pan
2020-06-24  6:54   ` Lu Baolu
2020-06-24 17:07     ` Jacob Pan
2020-06-25  7:07       ` Lu Baolu
2020-06-23 17:03 ` [PATCH v3 5/5] iommu/uapi: Support both kernel and user unbind guest PASID Jacob Pan
2020-06-24  7:55   ` Lu Baolu
2020-06-25 12:59   ` Lu Baolu

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