linux-kernel - [PATCH v9 1/4] iommu: Add dummy dev_iommu_fwspec

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Date:   Fri, 28 Oct 2022 18:32:39 +0530
From:   Prathamesh Shete <pshete@...dia.com>
To:     <joro@...tes.org>, <adrian.hunter@...el.com>,
        <ulf.hansson@...aro.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <p.zabel@...gutronix.de>,
        <linux-mmc@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <will@...nel.org>, <iommu@...ts.linux.dev>, <robin.murphy@....com>,
        <anrao@...dia.com>, <smangipudi@...dia.com>, <pshete@...dia.com>,
        <kyarlagadda@...dia.com>, Thierry Reding <treding@...dia.com>
Subject: [PATCH v9 1/4] iommu: Add dummy dev_iommu_fwspec_get() helper

This dummy implementation is useful to avoid a dependency on the
IOMMU_API Kconfig symbol in drivers that can optionally use the IOMMU
API.

In order to fully use this, also move the struct iommu_fwspec definition
out of the IOMMU_API protected region.

Signed-off-by: Thierry Reding <treding@...dia.com>
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 include/linux/iommu.h | 39 +++++++++++++++++++--------------------
 1 file changed, 19 insertions(+), 20 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index ea30f00dc145..afa829bc4356 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -173,6 +173,25 @@ enum iommu_dev_features {
 
 #define IOMMU_PASID_INVALID	(-1U)
 
+/**
+ * struct iommu_fwspec - per-device IOMMU instance data
+ * @ops: ops for this device's IOMMU
+ * @iommu_fwnode: firmware handle for this device's IOMMU
+ * @flags: IOMMU_FWSPEC_* flags
+ * @num_ids: number of associated device IDs
+ * @ids: IDs which this device may present to the IOMMU
+ */
+struct iommu_fwspec {
+	const struct iommu_ops	*ops;
+	struct fwnode_handle	*iommu_fwnode;
+	u32			flags;
+	unsigned int		num_ids;
+	u32			ids[];
+};
+
+/* ATS is supported */
+#define IOMMU_FWSPEC_PCI_RC_ATS			(1 << 0)
+
 #ifdef CONFIG_IOMMU_API
 
 /**
@@ -600,25 +619,6 @@ extern struct iommu_group *generic_device_group(struct device *dev);
 /* FSL-MC device grouping function */
 struct iommu_group *fsl_mc_device_group(struct device *dev);
 
-/**
- * struct iommu_fwspec - per-device IOMMU instance data
- * @ops: ops for this device's IOMMU
- * @iommu_fwnode: firmware handle for this device's IOMMU
- * @flags: IOMMU_FWSPEC_* flags
- * @num_ids: number of associated device IDs
- * @ids: IDs which this device may present to the IOMMU
- */
-struct iommu_fwspec {
-	const struct iommu_ops	*ops;
-	struct fwnode_handle	*iommu_fwnode;
-	u32			flags;
-	unsigned int		num_ids;
-	u32			ids[];
-};
-
-/* ATS is supported */
-#define IOMMU_FWSPEC_PCI_RC_ATS			(1 << 0)
-
 /**
  * struct iommu_sva - handle to a device-mm bond
  */
@@ -682,7 +682,6 @@ bool iommu_group_dma_owner_claimed(struct iommu_group *group);
 
 struct iommu_ops {};
 struct iommu_group {};
-struct iommu_fwspec {};
 struct iommu_device {};
 struct iommu_fault_param {};
 struct iommu_iotlb_gather {};
-- 
2.17.1