linux-kernel - [PATCH v2 2/3] iommu/uapi: Use unified UAPI version

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Message-Id: <1585178227-17061-3-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Wed, 25 Mar 2020 16:17:06 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     "Yi Liu" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v2 2/3] iommu/uapi: Use unified UAPI version

Reuse UAPI version for each UAPI data structure.
This is to avoid supporting multiple version combinations, simplify
support model as we bump up the versions.

Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/intel-iommu.c | 3 ++-
 drivers/iommu/intel-svm.c   | 2 +-
 drivers/iommu/iommu.c       | 3 ++-
 include/uapi/linux/iommu.h  | 9 +++------
 4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index c1c0b0fb93c3..0304f7626a38 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5779,8 +5779,9 @@ static int intel_iommu_sva_invalidate(struct iommu_domain *domain,
 	int ret = 0;
 	u64 size = 0;
 
+	/* Support current or older UAPI versions */
 	if (!inv_info || !dmar_domain ||
-		inv_info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1)
+		inv_info->version > IOMMU_UAPI_VERSION)
 		return -EINVAL;
 
 	if (!dev || !dev_is_pci(dev))
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 47c0deb5ae56..67ac95eb5e33 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -239,7 +239,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain,
 	if (WARN_ON(!iommu) || !data)
 		return -EINVAL;
 
-	if (data->version != IOMMU_GPASID_BIND_VERSION_1 ||
+	if (data->version > IOMMU_UAPI_VERSION ||
 	    data->format != IOMMU_PASID_FORMAT_INTEL_VTD)
 		return -EINVAL;
 
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3e3528436e0b..c476b58e0ffb 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1113,7 +1113,8 @@ int iommu_page_response(struct device *dev,
 	if (!param || !param->fault_param)
 		return -EINVAL;
 
-	if (msg->version != IOMMU_PAGE_RESP_VERSION_1 ||
+	/* Support current or older UAPI versions */
+	if (msg->version > IOMMU_UAPI_VERSION ||
 	    msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID)
 		return -EINVAL;
 
diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
index 25dba9198d7f..e9532c747dbd 100644
--- a/include/uapi/linux/iommu.h
+++ b/include/uapi/linux/iommu.h
@@ -188,7 +188,7 @@ enum iommu_page_response_code {
 
 /**
  * struct iommu_page_response - Generic page response information
- * @version: API version of this structure
+ * @version: IOMMU_UAPI_VERSION
  * @flags: encodes whether the corresponding fields are valid
  *         (IOMMU_FAULT_PAGE_RESPONSE_* values)
  * @pasid: Process Address Space ID
@@ -196,7 +196,6 @@ enum iommu_page_response_code {
  * @code: response code from &enum iommu_page_response_code
  */
 struct iommu_page_response {
-#define IOMMU_PAGE_RESP_VERSION_1	1
 	__u32	version;
 #define IOMMU_PAGE_RESP_PASID_VALID	(1 << 0)
 	__u32	flags;
@@ -271,7 +270,7 @@ struct iommu_inv_pasid_info {
 /**
  * struct iommu_cache_invalidate_info - First level/stage invalidation
  *     information
- * @version: API version of this structure
+ * @version: IOMMU_UAPI_VERSION
  * @cache: bitfield that allows to select which caches to invalidate
  * @granularity: defines the lowest granularity used for the invalidation:
  *     domain > PASID > addr
@@ -299,7 +298,6 @@ struct iommu_inv_pasid_info {
  * must support the used granularity.
  */
 struct iommu_cache_invalidate_info {
-#define IOMMU_CACHE_INVALIDATE_INFO_VERSION_1 1
 	__u32	version;
 /* IOMMU paging structure cache */
 #define IOMMU_CACHE_INV_TYPE_IOTLB	(1 << 0) /* IOMMU IOTLB */
@@ -343,7 +341,7 @@ struct iommu_gpasid_bind_data_vtd {
 					 IOMMU_SVA_VTD_GPASID_PWT)
 /**
  * struct iommu_gpasid_bind_data - Information about device and guest PASID binding
- * @version:	Version of this data structure
+ * @version:	IOMMU_UAPI_VERSION
  * @format:	PASID table entry format
  * @flags:	Additional information on guest bind request
  * @gpgd:	Guest page directory base of the guest mm to bind
@@ -360,7 +358,6 @@ struct iommu_gpasid_bind_data_vtd {
  * PASID to host PASID based on this bind data.
  */
 struct iommu_gpasid_bind_data {
-#define IOMMU_GPASID_BIND_VERSION_1	1
 	__u32 version;
 #define IOMMU_PASID_FORMAT_INTEL_VTD	1
 	__u32 format;
-- 
2.7.4