linux-kernel - [PATCH v3 06/15] iommu: Move iommu_fwspec to struct dev

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Date:   Fri, 20 Mar 2020 10:14:05 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, guohanjun@...wei.com,
        Sudeep Holla <sudeep.holla@....com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Joerg Roedel <jroedel@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v3 06/15] iommu: Move iommu_fwspec to struct dev_iommu

From: Joerg Roedel <jroedel@...e.de>

Move the iommu_fwspec pointer in struct device into struct dev_iommu.
This is a step in the effort to reduce the iommu related pointers in
struct device to one.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Tested-by: Will Deacon <will@...nel.org> # arm-smmu
Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/iommu.c  |  3 +++
 include/linux/device.h |  3 ---
 include/linux/iommu.h  | 12 ++++++++----
 3 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index beac2ef063dd..826a67ba247f 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2405,6 +2405,9 @@ int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 	if (fwspec)
 		return ops == fwspec->ops ? 0 : -EINVAL;
 
+	if (!dev_iommu_get(dev))
+		return -ENOMEM;
+
 	fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
 	if (!fwspec)
 		return -ENOMEM;
diff --git a/include/linux/device.h b/include/linux/device.h
index 405a8f11bec1..fc1427ab7e85 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -42,7 +42,6 @@ struct device_node;
 struct fwnode_handle;
 struct iommu_ops;
 struct iommu_group;
-struct iommu_fwspec;
 struct dev_pin_info;
 struct dev_iommu;
 
@@ -513,7 +512,6 @@ struct dev_links_info {
  * 		gone away. This should be set by the allocator of the
  * 		device (i.e. the bus driver that discovered the device).
  * @iommu_group: IOMMU group the device belongs to.
- * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
  * @iommu:	Per device generic IOMMU runtime data
  *
  * @offline_disabled: If set, the device is permanently online.
@@ -613,7 +611,6 @@ struct device {
 
 	void	(*release)(struct device *dev);
 	struct iommu_group	*iommu_group;
-	struct iommu_fwspec	*iommu_fwspec;
 	struct dev_iommu	*iommu;
 
 	bool			offline_disabled:1;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 1c9fa5c1174b..f5edc21a644d 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -368,14 +368,15 @@ struct iommu_fault_param {
  * struct dev_iommu - Collection of per-device IOMMU data
  *
  * @fault_param: IOMMU detected device fault reporting data
+ * @fwspec:	 IOMMU fwspec data
  *
  * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
  *	struct iommu_group	*iommu_group;
- *	struct iommu_fwspec	*iommu_fwspec;
  */
 struct dev_iommu {
 	struct mutex lock;
-	struct iommu_fault_param *fault_param;
+	struct iommu_fault_param	*fault_param;
+	struct iommu_fwspec		*fwspec;
 };
 
 int  iommu_device_register(struct iommu_device *iommu);
@@ -614,13 +615,16 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 
 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
 {
-	return dev->iommu_fwspec;
+	if (dev->iommu)
+		return dev->iommu->fwspec;
+	else
+		return NULL;
 }
 
 static inline void dev_iommu_fwspec_set(struct device *dev,
 					struct iommu_fwspec *fwspec)
 {
-	dev->iommu_fwspec = fwspec;
+	dev->iommu->fwspec = fwspec;
 }
 
 int iommu_probe_device(struct device *dev);
-- 
2.17.1