[PATCH v2 01/17] iommu: Remove struct iommu_ops *iommu from arch_setup_dma_ops()

Jason Gunthorpe
2023-11-15T14:06:34Z

This is not being used to pass ops, it is just a way to tell if an
iommu driver was probed. These days this can be detected directly via
device_iommu_mapped(). Call device_iommu_mapped() in the two places that
need to check it and remove the iommu parameter everywhere.

Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
arch/arc/mm/dma.c | 2 +-
arch/arm/mm/dma-mapping-nommu.c | 2 +-
arch/arm/mm/dma-mapping.c | 10 +++++-----
arch/arm64/mm/dma-mapping.c | 4 ++--
arch/mips/mm/dma-noncoherent.c | 2 +-
arch/riscv/mm/dma-noncoherent.c | 2 +-
drivers/acpi/scan.c | 3 +--
drivers/hv/hv_common.c | 2 +-
drivers/of/device.c | 2 +-
include/linux/dma-map-ops.h | 4 ++--
10 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
index 2a7fbbb83b7056..197707bc765889 100644
--- a/arch/arc/mm/dma.c
+++ b/arch/arc/mm/dma.c
@@ -91,7 +91,7 @@ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
* Plug in direct dma map ops.
*/
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent)
+ bool coherent)
{
/*
* IOC hardware snoops all DMA traffic keeping the caches consistent
diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c
index cfd9c933d2f09c..b94850b579952a 100644
--- a/arch/arm/mm/dma-mapping-nommu.c
+++ b/arch/arm/mm/dma-mapping-nommu.c
@@ -34,7 +34,7 @@ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
}

void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent)
+ bool coherent)
{
if (IS_ENABLED(CONFIG_CPU_V7M)) {
/*
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 5409225b4abc06..6c359a3af8d9c7 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1713,7 +1713,7 @@ void arm_iommu_detach_device(struct device *dev)
EXPORT_SYMBOL_GPL(arm_iommu_detach_device);

static void arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent)
+ bool coherent)
{
struct dma_iommu_mapping *mapping;

@@ -1748,7 +1748,7 @@ static void arm_teardown_iommu_dma_ops(struct device *dev)
#else

static void arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent)
+ bool coherent)
{
}

@@ -1757,7 +1757,7 @@ static void arm_teardown_iommu_dma_ops(struct device *dev) { }
#endif /* CONFIG_ARM_DMA_USE_IOMMU */

void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent)
+ bool coherent)
{
/*
* Due to legacy code that sets the ->dma_coherent flag from a bus
@@ -1776,8 +1776,8 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
if (dev->dma_ops)
return;

- if (iommu)
- arm_setup_iommu_dma_ops(dev, dma_base, size, iommu, coherent);
+ if (device_iommu_mapped(dev))
+ arm_setup_iommu_dma_ops(dev, dma_base, size, coherent);

xen_setup_dma_ops(dev);
dev->archdata.dma_ops_setup = true;
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 3cb101e8cb29ba..61886e43e3a10f 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -47,7 +47,7 @@ void arch_teardown_dma_ops(struct device *dev)
#endif

void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent)
+ bool coherent)
{
int cls = cache_line_size_of_cpu();

@@ -58,7 +58,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
ARCH_DMA_MINALIGN, cls);

dev->dma_coherent = coherent;
- if (iommu)
+ if (device_iommu_mapped(dev))
iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1);

xen_setup_dma_ops(dev);
diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c
index 3c4fc97b9f394b..0f3cec663a12cd 100644
--- a/arch/mips/mm/dma-noncoherent.c
+++ b/arch/mips/mm/dma-noncoherent.c
@@ -138,7 +138,7 @@ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,

#ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent)
+ bool coherent)
{
dev->dma_coherent = coherent;
}
diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c
index 4e4e469b8dd66c..843107f834b231 100644
--- a/arch/riscv/mm/dma-noncoherent.c
+++ b/arch/riscv/mm/dma-noncoherent.c
@@ -129,7 +129,7 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
}

void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent)
+ bool coherent)
{
WARN_TAINT(!coherent && riscv_cbom_block_size > ARCH_DMA_MINALIGN,
TAINT_CPU_OUT_OF_SPEC,
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index fa5dd71a80fad9..9682291188c49c 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1636,8 +1636,7 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
if (PTR_ERR(iommu) == -EPROBE_DEFER)
return -EPROBE_DEFER;

- arch_setup_dma_ops(dev, 0, U64_MAX,
- iommu, attr == DEV_DMA_COHERENT);
+ arch_setup_dma_ops(dev, 0, U64_MAX, attr == DEV_DMA_COHERENT);

return 0;
}
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 4372f5d146ab22..0285a74363b3d1 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -488,7 +488,7 @@ void hv_setup_dma_ops(struct device *dev, bool coherent)
* Hyper-V does not offer a vIOMMU in the guest
* VM, so pass 0/NULL for the IOMMU settings
*/
- arch_setup_dma_ops(dev, 0, 0, NULL, coherent);
+ arch_setup_dma_ops(dev, 0, 0, coherent);
}
EXPORT_SYMBOL_GPL(hv_setup_dma_ops);

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 1ca42ad9dd159d..65c71be71a8d45 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -193,7 +193,7 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
dev_dbg(dev, "device is%sbehind an iommu\n",
iommu ? " " : " not ");

- arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
+ arch_setup_dma_ops(dev, dma_start, size, coherent);

if (!iommu)
of_dma_set_restricted_buffer(dev, np);
diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h
index f2fc203fb8a1a2..2cb98a12c50348 100644
--- a/include/linux/dma-map-ops.h
+++ b/include/linux/dma-map-ops.h
@@ -426,10 +426,10 @@ bool arch_dma_unmap_sg_direct(struct device *dev, struct scatterlist *sg,

#ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu, bool coherent);
+ bool coherent);
#else
static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
- u64 size, const struct iommu_ops *iommu, bool coherent)
+ u64 size, bool coherent)
{
}
#endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */