[PATCH 2/3] iommu/dma: Move public interfaces to linux/iommu.h
From: Robin Murphy
Date: Tue Aug 16 2022 - 13:28:49 EST
The iommu-dma layer is now mostly encapsulated by iommu_dma_ops, with
only a couple more public interfaces left pertaining to MSI integration.
Since these depend on the main IOMMU API header anyway, move their
declarations there, taking the opportunity to update the half-baked
comments to proper kerneldoc along the way.
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
---
Note that iommu_setup_dma_ops() should also become internal in a future
phase of the great IOMMU API upheaval - for now as the last bit of true
arch code glue I consider it more "necessarily exposed" than "public".
arch/arm64/mm/dma-mapping.c | 2 +-
drivers/iommu/dma-iommu.c | 15 ++++++++++--
drivers/irqchip/irq-gic-v2m.c | 2 +-
drivers/irqchip/irq-gic-v3-its.c | 2 +-
drivers/irqchip/irq-gic-v3-mbi.c | 2 +-
drivers/irqchip/irq-ls-scfg-msi.c | 2 +-
drivers/vfio/vfio_iommu_type1.c | 1 -
include/linux/dma-iommu.h | 40 -------------------------------
include/linux/iommu.h | 36 ++++++++++++++++++++++++++++
9 files changed, 54 insertions(+), 48 deletions(-)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 599cf81f5685..7d7e9a046305 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -7,7 +7,7 @@
#include <linux/gfp.h>
#include <linux/cache.h>
#include <linux/dma-map-ops.h>
-#include <linux/dma-iommu.h>
+#include <linux/iommu.h>
#include <xen/xen.h>
#include <asm/cacheflush.h>
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 17dd683b2fce..6809b33ac9df 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -1633,6 +1633,13 @@ static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
return NULL;
}
+/**
+ * iommu_dma_prepare_msi() - Map the MSI page in the IOMMU domain
+ * @desc: MSI descriptor, will store the MSI page
+ * @msi_addr: MSI target address to be mapped
+ *
+ * Return: 0 on success or negative error code if the mapping failed.
+ */
int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
{
struct device *dev = msi_desc_to_dev(desc);
@@ -1661,8 +1668,12 @@ int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
return 0;
}
-void iommu_dma_compose_msi_msg(struct msi_desc *desc,
- struct msi_msg *msg)
+/**
+ * iommu_dma_compose_msi_msg() - Apply translation to an MSI message
+ * @desc: MSI descriptor prepared by iommu_dma_prepare_msi()
+ * @msg: MSI message containing target physical address
+ */
+void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
{
struct device *dev = msi_desc_to_dev(desc);
const struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index b249d4df899e..6e1ac330d7a6 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -13,7 +13,7 @@
#define pr_fmt(fmt) "GICv2m: " fmt
#include <linux/acpi.h>
-#include <linux/dma-iommu.h>
+#include <linux/iommu.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 5ff09de6c48f..e7d8d4208ee6 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -11,9 +11,9 @@
#include <linux/cpu.h>
#include <linux/crash_dump.h>
#include <linux/delay.h>
-#include <linux/dma-iommu.h>
#include <linux/efi.h>
#include <linux/interrupt.h>
+#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/irqdomain.h>
#include <linux/list.h>
diff --git a/drivers/irqchip/irq-gic-v3-mbi.c b/drivers/irqchip/irq-gic-v3-mbi.c
index a2163d32f17d..e1efdec9e9ac 100644
--- a/drivers/irqchip/irq-gic-v3-mbi.c
+++ b/drivers/irqchip/irq-gic-v3-mbi.c
@@ -6,7 +6,7 @@
#define pr_fmt(fmt) "GICv3: " fmt
-#include <linux/dma-iommu.h>
+#include <linux/iommu.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
diff --git a/drivers/irqchip/irq-ls-scfg-msi.c b/drivers/irqchip/irq-ls-scfg-msi.c
index b4927e425f7b..527c90e0920e 100644
--- a/drivers/irqchip/irq-ls-scfg-msi.c
+++ b/drivers/irqchip/irq-ls-scfg-msi.c
@@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/interrupt.h>
+#include <linux/iommu.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
@@ -18,7 +19,6 @@
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/spinlock.h>
-#include <linux/dma-iommu.h>
#define MSI_IRQS_PER_MSIR 32
#define MSI_MSIR_OFFSET 4
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index c766aa683110..e65861fdba7b 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -37,7 +37,6 @@
#include <linux/vfio.h>
#include <linux/workqueue.h>
#include <linux/notifier.h>
-#include <linux/dma-iommu.h>
#include <linux/irqdomain.h>
#include "vfio.h"
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 24607dc3c2ac..e83de4f1f3d6 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -15,27 +15,10 @@
/* Domain management interface for IOMMU drivers */
int iommu_get_dma_cookie(struct iommu_domain *domain);
-int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
void iommu_put_dma_cookie(struct iommu_domain *domain);
-/* Setup call for arch DMA mapping code */
-void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
int iommu_dma_init_fq(struct iommu_domain *domain);
-/* The DMA API isn't _quite_ the whole story, though... */
-/*
- * iommu_dma_prepare_msi() - Map the MSI page in the IOMMU device
- *
- * The MSI page will be stored in @desc.
- *
- * Return: 0 on success otherwise an error describing the failure.
- */
-int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
-
-/* Update the MSI message if required. */
-void iommu_dma_compose_msi_msg(struct msi_desc *desc,
- struct msi_msg *msg);
-
void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
@@ -46,15 +29,8 @@ extern bool iommu_dma_forcedac;
#else /* CONFIG_IOMMU_DMA */
struct iommu_domain;
-struct msi_desc;
-struct msi_msg;
struct device;
-static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
- u64 dma_limit)
-{
-}
-
static inline int iommu_dma_init_fq(struct iommu_domain *domain)
{
return -EINVAL;
@@ -65,26 +41,10 @@ static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
return -ENODEV;
}
-static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
-{
- return -ENODEV;
-}
-
static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
{
}
-static inline int iommu_dma_prepare_msi(struct msi_desc *desc,
- phys_addr_t msi_addr)
-{
- return 0;
-}
-
-static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc,
- struct msi_msg *msg)
-{
-}
-
static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
{
}
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 70393fbb57ed..79cb6eb560a8 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -1059,4 +1059,40 @@ void iommu_debugfs_setup(void);
static inline void iommu_debugfs_setup(void) {}
#endif
+#ifdef CONFIG_IOMMU_DMA
+#include <linux/msi.h>
+
+/* Setup call for arch DMA mapping code */
+void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
+
+int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
+
+int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
+void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg);
+
+#else /* CONFIG_IOMMU_DMA */
+
+struct msi_desc;
+struct msi_msg;
+
+static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
+{
+}
+
+static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
+{
+ return -ENODEV;
+}
+
+static inline int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
+{
+ return 0;
+}
+
+static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
+{
+}
+
+#endif /* CONFIG_IOMMU_DMA */
+
#endif /* __LINUX_IOMMU_H */
--
2.36.1.dirty