* [PATCH 2/2] dma-mapping: clearly mark DMA ops as an architecture feature
2024-08-28 6:10 clearly mark DMA_OPS support as an architecture feature v2 Christoph Hellwig
2024-08-28 6:10 ` [PATCH 1/2] vdpa_sim: don't select DMA_OPS Christoph Hellwig
@ 2024-08-28 6:10 ` Christoph Hellwig
2024-08-28 6:21 ` Andreas Larsson
2024-09-03 7:27 ` clearly mark DMA_OPS support as an architecture feature v2 Christoph Hellwig
2 siblings, 1 reply; 8+ messages in thread
From: Christoph Hellwig @ 2024-08-28 6:10 UTC (permalink / raw)
To: iommu
Cc: Marek Szyprowski, Robin Murphy, Sakari Ailus, Bingbu Cao,
Michael S . Tsirkin , Jason Wang, linux-kernel, linux-alpha,
linux-arm-kernel, linux-mips, linux-parisc, linuxppc-dev,
linux-s390, sparclinux, linux-media, virtualization, xen-devel,
Thomas Gleixner
DMA ops are a helper for architectures and not for drivers to override
the DMA implementation.
Unfortunately driver authors keep ignoring this. Make the fact more
clear by renaming the symbol to ARCH_HAS_DMA_OPS and having the two drivers
overriding their dma_ops depend on that. These drivers should probably be
marked broken, but we can give them a bit of a grace period for that.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> # for IPU6
Acked-by: Robin Murphy <robin.murphy@arm.com>
---
arch/Kconfig | 9 +++++++++
arch/alpha/Kconfig | 2 +-
arch/arm/Kconfig | 2 +-
arch/arm64/Kconfig | 1 +
arch/mips/Kconfig | 2 +-
arch/parisc/Kconfig | 2 +-
arch/powerpc/Kconfig | 2 +-
arch/s390/Kconfig | 2 +-
arch/sparc/Kconfig | 2 +-
arch/x86/Kconfig | 2 +-
drivers/macintosh/macio_asic.c | 4 ++--
drivers/media/pci/intel/ipu6/Kconfig | 7 ++++++-
drivers/vdpa/Kconfig | 7 ++++++-
drivers/xen/Kconfig | 4 ++--
include/linux/device.h | 2 +-
include/linux/dma-map-ops.h | 6 +++---
kernel/dma/Kconfig | 9 ++-------
kernel/dma/Makefile | 2 +-
18 files changed, 41 insertions(+), 26 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 975dd22a2dbd22..61c4ec04878754 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -17,6 +17,15 @@ config CPU_MITIGATIONS
def_bool y
endif
+#
+# Selected by architectures that need custom DMA operations for e.g. legacy
+# IOMMUs not handled by dma-iommu. Drivers must never select this symbol.
+#
+config ARCH_HAS_DMA_OPS
+ depends on HAS_DMA
+ select DMA_OPS_HELPERS
+ bool
+
menu "General architecture-dependent options"
config ARCH_HAS_SUBPAGE_FAULTS
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 50ff06d5b799c9..109a4cddcd1389 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -4,12 +4,12 @@ config ALPHA
default y
select ARCH_32BIT_USTAT_F_TINODE
select ARCH_HAS_CURRENT_STACK_POINTER
+ select ARCH_HAS_DMA_OPS if PCI
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
select ARCH_NO_PREEMPT
select ARCH_NO_SG_CHAIN
select ARCH_USE_CMPXCHG_LOCKREF
- select DMA_OPS if PCI
select FORCE_PCI
select PCI_DOMAINS if PCI
select PCI_SYSCALL if PCI
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 54b2bb817a7fc0..f5f7995a2f8f59 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -10,6 +10,7 @@ config ARM
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DEBUG_VIRTUAL if MMU
select ARCH_HAS_DMA_ALLOC if MMU
+ select ARCH_HAS_DMA_OPS
select ARCH_HAS_DMA_WRITE_COMBINE if !ARM_DMA_MEM_BUFFERABLE
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FORTIFY_SOURCE
@@ -54,7 +55,6 @@ config ARM
select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
select DMA_DECLARE_COHERENT
select DMA_GLOBAL_POOL if !MMU
- select DMA_OPS
select DMA_NONCOHERENT_MMAP if MMU
select EDAC_SUPPORT
select EDAC_ATOMIC_SCRUB
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a2f8ff354ca670..40940cbde435a3 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -24,6 +24,7 @@ config ARM64
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEBUG_VM_PGTABLE
+ select ARCH_HAS_DMA_OPS if XEN
select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_FAST_MULTIPLIER
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 60077e57693563..023ad33a7e945d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -8,6 +8,7 @@ config MIPS
select ARCH_HAS_CPU_FINALIZE_INIT
select ARCH_HAS_CURRENT_STACK_POINTER if !CC_IS_CLANG || CLANG_VERSION >= 140000
select ARCH_HAS_DEBUG_VIRTUAL if !64BIT
+ select ARCH_HAS_DMA_OPS if MACH_JAZZ
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_KCOV
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE if !EVA
@@ -393,7 +394,6 @@ config MACH_JAZZ
select ARC_PROMLIB
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
- select DMA_OPS
select FW_ARC
select FW_ARC32
select ARCH_MAY_HAVE_PC_FDC
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index b0a2ac3ba91610..859835a0692c24 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -10,6 +10,7 @@ config PARISC
select ARCH_WANT_FRAME_POINTERS
select ARCH_HAS_CPU_CACHE_ALIASING
select ARCH_HAS_DMA_ALLOC if PA11
+ select ARCH_HAS_DMA_OPS
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_STRICT_MODULE_RWX
@@ -23,7 +24,6 @@ config PARISC
select ARCH_HAS_CACHE_LINE_SIZE
select ARCH_HAS_DEBUG_VM_PGTABLE
select HAVE_RELIABLE_STACKTRACE
- select DMA_OPS
select RTC_CLASS
select RTC_DRV_GENERIC
select INIT_ALL_POSSIBLE
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d7b09b064a8ac5..f87fc0375a92b3 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -133,6 +133,7 @@ config PPC
select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
+ select ARCH_HAS_DMA_OPS if PPC64
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_KCOV
@@ -185,7 +186,6 @@ config PPC
select CPUMASK_OFFSTACK if NR_CPUS >= 8192
select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
select DMA_OPS_BYPASS if PPC64
- select DMA_OPS if PPC64
select DYNAMIC_FTRACE if FUNCTION_TRACER
select EDAC_ATOMIC_SCRUB
select EDAC_SUPPORT
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index a822f952f64a9c..f31f6b85c25ccc 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -70,6 +70,7 @@ config S390
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DEBUG_WX
select ARCH_HAS_DEVMEM_IS_ALLOWED
+ select ARCH_HAS_DMA_OPS if PCI
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FORCE_DMA_UNENCRYPTED
select ARCH_HAS_FORTIFY_SOURCE
@@ -137,7 +138,6 @@ config S390
select BUILDTIME_TABLE_SORT
select CLONE_BACKWARDS2
select DCACHE_WORD_ACCESS if !KMSAN
- select DMA_OPS if PCI
select DYNAMIC_FTRACE if FUNCTION_TRACER
select FUNCTION_ALIGNMENT_8B if CC_IS_GCC
select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 11bf9d312318c6..dcfdb7f1dae976 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -14,9 +14,9 @@ config SPARC
bool
default y
select ARCH_HAS_CPU_CACHE_ALIASING
+ select ARCH_HAS_DMA_OPS
select ARCH_MIGHT_HAVE_PC_PARPORT if SPARC64 && PCI
select ARCH_MIGHT_HAVE_PC_SERIO
- select DMA_OPS
select OF
select OF_PROMTREE
select HAVE_ASM_MODVERSIONS
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 007bab9f2a0e39..9e2e7d361019fe 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -79,6 +79,7 @@ config X86
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEBUG_VM_PGTABLE if !X86_PAE
select ARCH_HAS_DEVMEM_IS_ALLOWED
+ select ARCH_HAS_DMA_OPS if GART_IOMMU || XEN
select ARCH_HAS_EARLY_DEBUG if KGDB
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FAST_MULTIPLIER
@@ -943,7 +944,6 @@ config DMI
config GART_IOMMU
bool "Old AMD GART IOMMU support"
- select DMA_OPS
select IOMMU_HELPER
select SWIOTLB
depends on X86_64 && PCI && AMD_NB
diff --git a/drivers/macintosh/macio_asic.c b/drivers/macintosh/macio_asic.c
index 13626205530d36..bede200e32e8ff 100644
--- a/drivers/macintosh/macio_asic.c
+++ b/drivers/macintosh/macio_asic.c
@@ -387,7 +387,7 @@ static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
dma_set_max_seg_size(&dev->ofdev.dev, 65536);
dma_set_seg_boundary(&dev->ofdev.dev, 0xffffffff);
-#if defined(CONFIG_PCI) && defined(CONFIG_DMA_OPS)
+#if defined(CONFIG_PCI) && defined(CONFIG_ARCH_HAS_DMA_OPS)
/* Set the DMA ops to the ones from the PCI device, this could be
* fishy if we didn't know that on PowerMac it's always direct ops
* or iommu ops that will work fine
@@ -396,7 +396,7 @@ static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
*/
dev->ofdev.dev.archdata = chip->lbus.pdev->dev.archdata;
dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops;
-#endif /* CONFIG_PCI && CONFIG_DMA_OPS */
+#endif /* CONFIG_PCI && CONFIG_ARCH_HAS_DMA_OPS */
#ifdef DEBUG
printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
diff --git a/drivers/media/pci/intel/ipu6/Kconfig b/drivers/media/pci/intel/ipu6/Kconfig
index 40e20f0aa5ae5d..49e4fb696573f6 100644
--- a/drivers/media/pci/intel/ipu6/Kconfig
+++ b/drivers/media/pci/intel/ipu6/Kconfig
@@ -4,8 +4,13 @@ config VIDEO_INTEL_IPU6
depends on VIDEO_DEV
depends on X86 && X86_64 && HAS_DMA
depends on IPU_BRIDGE || !IPU_BRIDGE
+ #
+ # This driver incorrectly tries to override the dma_ops. It should
+ # never have done that, but for now keep it working on architectures
+ # that use dma ops
+ #
+ depends on ARCH_HAS_DMA_OPS
select AUXILIARY_BUS
- select DMA_OPS
select IOMMU_IOVA
select VIDEO_V4L2_SUBDEV_API
select MEDIA_CONTROLLER
diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
index b08de3b7706109..559fb9d3271fcc 100644
--- a/drivers/vdpa/Kconfig
+++ b/drivers/vdpa/Kconfig
@@ -35,7 +35,12 @@ config VDPA_SIM_BLOCK
config VDPA_USER
tristate "VDUSE (vDPA Device in Userspace) support"
depends on EVENTFD && MMU && HAS_DMA
- select DMA_OPS
+ #
+ # This driver incorrectly tries to override the dma_ops. It should
+ # never have done that, but for now keep it working on architectures
+ # that use dma ops
+ #
+ depends on ARCH_HAS_DMA_OPS
select VHOST_IOTLB
select IOMMU_IOVA
help
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index d5989871dd5de3..27f288b5f30c37 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -177,8 +177,8 @@ config XEN_GRANT_DMA_ALLOC
config SWIOTLB_XEN
def_bool y
+ depends on ARCH_DMA_OPS
depends on XEN_PV || ARM || ARM64
- select DMA_OPS
select SWIOTLB
config XEN_PCI_STUB
@@ -348,10 +348,10 @@ config XEN_GRANT_DMA_IOMMU
config XEN_GRANT_DMA_OPS
bool
- select DMA_OPS
config XEN_VIRTIO
bool "Xen virtio support"
+ depends on ARCH_DMA_OPS
depends on VIRTIO
select XEN_GRANT_DMA_OPS
select XEN_GRANT_DMA_IOMMU if OF
diff --git a/include/linux/device.h b/include/linux/device.h
index 1c5280d28bc389..b4bde8d226979b 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -750,7 +750,7 @@ struct device {
struct dev_pin_info *pins;
#endif
struct dev_msi_info msi;
-#ifdef CONFIG_DMA_OPS
+#ifdef CONFIG_ARCH_HAS_DMA_OPS
const struct dma_map_ops *dma_ops;
#endif
u64 *dma_mask; /* dma mask (if dma'able device) */
diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h
index 077b15c93bb8ff..9668ddf3696e71 100644
--- a/include/linux/dma-map-ops.h
+++ b/include/linux/dma-map-ops.h
@@ -75,7 +75,7 @@ struct dma_map_ops {
unsigned long (*get_merge_boundary)(struct device *dev);
};
-#ifdef CONFIG_DMA_OPS
+#ifdef CONFIG_ARCH_HAS_DMA_OPS
#include <asm/dma-mapping.h>
static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
@@ -90,7 +90,7 @@ static inline void set_dma_ops(struct device *dev,
{
dev->dma_ops = dma_ops;
}
-#else /* CONFIG_DMA_OPS */
+#else /* CONFIG_ARCH_HAS_DMA_OPS */
static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
{
return NULL;
@@ -99,7 +99,7 @@ static inline void set_dma_ops(struct device *dev,
const struct dma_map_ops *dma_ops)
{
}
-#endif /* CONFIG_DMA_OPS */
+#endif /* CONFIG_ARCH_HAS_DMA_OPS */
#ifdef CONFIG_DMA_CMA
extern struct cma *dma_contiguous_default_area;
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 21bae17008368a..4c0dcd90912167 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -11,11 +11,6 @@ config HAS_DMA
config DMA_OPS_HELPERS
bool
-config DMA_OPS
- depends on HAS_DMA
- select DMA_OPS_HELPERS
- bool
-
#
# IOMMU drivers that can bypass the IOMMU code and optionally use the direct
# mapping fast path should select this option and set the dma_ops_bypass
@@ -113,8 +108,8 @@ config DMA_BOUNCE_UNALIGNED_KMALLOC
config DMA_NEED_SYNC
def_bool ARCH_HAS_SYNC_DMA_FOR_DEVICE || ARCH_HAS_SYNC_DMA_FOR_CPU || \
- ARCH_HAS_SYNC_DMA_FOR_CPU_ALL || DMA_API_DEBUG || DMA_OPS || \
- SWIOTLB
+ ARCH_HAS_SYNC_DMA_FOR_CPU_ALL || DMA_API_DEBUG || \
+ ARCH_HAS_DMA_OPS || SWIOTLB
config DMA_RESTRICTED_POOL
bool "DMA Restricted Pool"
diff --git a/kernel/dma/Makefile b/kernel/dma/Makefile
index 2e6e933cf7f3fb..6977033444a375 100644
--- a/kernel/dma/Makefile
+++ b/kernel/dma/Makefile
@@ -2,7 +2,7 @@
obj-$(CONFIG_HAS_DMA) += mapping.o direct.o
obj-$(CONFIG_DMA_OPS_HELPERS) += ops_helpers.o
-obj-$(CONFIG_DMA_OPS) += dummy.o
+obj-$(CONFIG_ARCH_HAS_DMA_OPS) += dummy.o
obj-$(CONFIG_DMA_CMA) += contiguous.o
obj-$(CONFIG_DMA_DECLARE_COHERENT) += coherent.o
obj-$(CONFIG_DMA_API_DEBUG) += debug.o
--
2.43.0
^ permalink raw reply related [flat|nested] 8+ messages in thread