From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: iommu@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
"Lu Baolu" <baolu.lu@linux.intel.com>,
Joerg Roedel <joro@8bytes.org>,
David Woodhouse <dwmw2@infradead.org>
Cc: "Yi Liu" <yi.l.liu@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
Raj Ashok <ashok.raj@intel.com>,
Alex Williamson <alex.williamson@redhat.com>,
"Christoph Hellwig" <hch@infradead.org>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
Jonathan Cameron <jic23@kernel.org>,
Eric Auger <eric.auger@redhat.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH 3/3] iommu/uapi: Add helper function for size lookup
Date: Tue, 28 Jan 2020 22:02:04 -0800 [thread overview]
Message-ID: <1580277724-66994-4-git-send-email-jacob.jun.pan@linux.intel.com> (raw)
In-Reply-To: <1580277724-66994-1-git-send-email-jacob.jun.pan@linux.intel.com>
IOMMU UAPI can be extended in the future by adding new
fields at the end of each user data structure. Since we use
a unified UAPI version for compatibility checking, a lookup
function is needed to find the correct user data size to copy
from user.
This patch adds a helper function based on a 2D lookup with
version and type as input arguments.
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
drivers/iommu/iommu.c | 22 ++++++++++++++++++++++
include/linux/iommu.h | 6 ++++++
2 files changed, 28 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 7dd51c5d2ba1..9e5de9abebdf 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1696,6 +1696,28 @@ int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev,
}
EXPORT_SYMBOL_GPL(iommu_sva_unbind_gpasid);
+
+/**
+ * Maintain a UAPI version to user data structure size lookup for each
+ * API function types we support. e.g. bind guest pasid, cache invalidation.
+ * As data structures being extended with new members, the offsetofend()
+ * will identify the new sizes.
+ */
+const static int iommu_uapi_data_size[NR_IOMMU_UAPI_TYPE][IOMMU_UAPI_VERSION] = {
+ /* IOMMU_UAPI_BIND_GPASID */
+ {offsetofend(struct iommu_gpasid_bind_data, vtd)},
+ /* IOMMU_UAPI_CACHE_INVAL */
+ {offsetofend(struct iommu_cache_invalidate_info, addr_info)},
+ /* IOMMU_UAPI_PAGE_RESP */
+ {offsetofend(struct iommu_page_response, code)},
+};
+
+int iommu_uapi_get_data_size(int type, int version)
+{
+ return iommu_uapi_data_size[type][version - 1];
+}
+EXPORT_SYMBOL_GPL(iommu_uapi_get_data_size);
+
static void __iommu_detach_device(struct iommu_domain *domain,
struct device *dev)
{
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 9718c109ea0a..416fe02160ba 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -500,6 +500,7 @@ extern int iommu_report_device_fault(struct device *dev,
struct iommu_fault_event *evt);
extern int iommu_page_response(struct device *dev,
struct iommu_page_response *msg);
+extern int iommu_uapi_get_data_size(int type, int version);
extern int iommu_group_id(struct iommu_group *group);
extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
@@ -885,6 +886,11 @@ static inline int iommu_page_response(struct device *dev,
return -ENODEV;
}
+static int iommu_uapi_get_data_size(int type, int version)
+{
+ return -ENODEV;
+}
+
static inline int iommu_group_id(struct iommu_group *group)
{
return -ENODEV;
--
2.7.4
next prev parent reply other threads:[~2020-01-29 5:57 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-29 6:02 [PATCH 0/3] IOMMU user API enhancement Jacob Pan
2020-01-29 6:02 ` [PATCH 1/3] iommu/uapi: Define uapi version and capabilities Jacob Pan
2020-02-06 10:14 ` Auger Eric
2020-02-06 18:22 ` Jacob Pan
2020-01-29 6:02 ` [PATCH 2/3] iommu/uapi: Use unified UAPI version Jacob Pan
2020-01-29 6:02 ` Jacob Pan [this message]
2020-01-29 21:40 ` [PATCH 3/3] iommu/uapi: Add helper function for size lookup Alex Williamson
2020-01-29 22:19 ` Alex Williamson
2020-01-31 19:51 ` Jacob Pan
2020-01-31 23:51 ` Jacob Pan
2020-02-03 18:27 ` Alex Williamson
2020-02-03 20:41 ` Jacob Pan
2020-02-03 21:12 ` Alex Williamson
2020-02-03 22:41 ` Jacob Pan
2020-02-06 10:14 ` Auger Eric
2020-02-07 8:47 ` Jean-Philippe Brucker
2020-01-31 17:56 ` Jacob Pan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1580277724-66994-4-git-send-email-jacob.jun.pan@linux.intel.com \
--to=jacob.jun.pan@linux.intel.com \
--cc=alex.williamson@redhat.com \
--cc=ashok.raj@intel.com \
--cc=baolu.lu@linux.intel.com \
--cc=dwmw2@infradead.org \
--cc=eric.auger@redhat.com \
--cc=hch@infradead.org \
--cc=iommu@lists.linux-foundation.org \
--cc=jean-philippe@linaro.com \
--cc=jic23@kernel.org \
--cc=joro@8bytes.org \
--cc=kevin.tian@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=yi.l.liu@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).