@@ -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_DMA_OPS
+ depends on HAS_DMA
+ select DMA_OPS_HELPERS
+ bool
+
menu "General architecture-dependent options"
config ARCH_HAS_SUBPAGE_FAULTS
@@ -3,13 +3,13 @@ config ALPHA
bool
default y
select ARCH_32BIT_USTAT_F_TINODE
+ select ARCH_DMA_OPS if PCI
select ARCH_HAS_CURRENT_STACK_POINTER
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
@@ -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_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
@@ -15,6 +15,7 @@ config ARM64
select ARCH_BINFMT_ELF_EXTRA_PHDRS
select ARCH_BINFMT_ELF_STATE
select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
+ select ARCH_DMA_OPS if XEN
select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
select ARCH_ENABLE_MEMORY_HOTPLUG
select ARCH_ENABLE_MEMORY_HOTREMOVE
@@ -391,9 +391,9 @@ config MACH_JAZZ
bool "Jazz family of machines"
select ARC_MEMORY
select ARC_PROMLIB
+ select ARCH_DMA_OPS
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
@@ -3,6 +3,7 @@ config PARISC
def_bool y
select ALTERNATE_USER_ADDRESS_SPACE
select ARCH_32BIT_OFF_T if !64BIT
+ select ARCH_DMA_OPS
select ARCH_MIGHT_HAVE_PC_PARPORT
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
@@ -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
@@ -124,6 +124,7 @@ config PPC
select ARCH_32BIT_OFF_T if PPC32
select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
select ARCH_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
+ select ARCH_DMA_OPS if PPC64
select ARCH_ENABLE_MEMORY_HOTPLUG
select ARCH_ENABLE_MEMORY_HOTREMOVE
select ARCH_HAS_COPY_MC if PPC64
@@ -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
@@ -62,6 +62,7 @@ config S390
select ARCH_32BIT_USTAT_F_TINODE
select ARCH_BINFMT_ELF_STATE
select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
+ select ARCH_DMA_OPS if PCI
select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
select ARCH_ENABLE_MEMORY_HOTREMOVE
select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
@@ -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
@@ -13,10 +13,10 @@ config 64BIT
config SPARC
bool
default y
+ select ARCH_DMA_OPS
select ARCH_HAS_CPU_CACHE_ALIASING
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
@@ -65,6 +65,7 @@ config X86
select ARCH_CLOCKSOURCE_INIT
select ARCH_CONFIGURES_CPU_MITIGATIONS
select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
+ select ARCH_DMA_OPS if GART_IOMMU || XEN
select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRATION
select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64
select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG
@@ -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
@@ -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_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_DMA_OPS */
#ifdef DEBUG
printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
@@ -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_DMA_OPS
select AUXILIARY_BUS
- select DMA_OPS
select IOMMU_IOVA
select VIDEO_V4L2_SUBDEV_API
select MEDIA_CONTROLLER
@@ -12,7 +12,12 @@ if VDPA
config VDPA_SIM
tristate "vDPA device simulator core"
depends on RUNTIME_TESTING_MENU && 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_DMA_OPS
select VHOST_RING
select IOMMU_IOVA
help
@@ -36,7 +41,12 @@ 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_DMA_OPS
select VHOST_IOTLB
select IOMMU_IOVA
help
@@ -178,7 +178,7 @@ config XEN_GRANT_DMA_ALLOC
config SWIOTLB_XEN
def_bool y
depends on XEN_PV || ARM || ARM64
- select DMA_OPS
+ depends on ARCH_DMA_OPS
select SWIOTLB
config XEN_PCI_STUB
@@ -348,11 +348,11 @@ config XEN_GRANT_DMA_IOMMU
config XEN_GRANT_DMA_OPS
bool
- select DMA_OPS
config XEN_VIRTIO
bool "Xen virtio support"
depends on VIRTIO
+ depends on ARCH_DMA_OPS
select XEN_GRANT_DMA_OPS
select XEN_GRANT_DMA_IOMMU if OF
help
@@ -750,7 +750,7 @@ struct device {
struct dev_pin_info *pins;
#endif
struct dev_msi_info msi;
-#ifdef CONFIG_DMA_OPS
+#ifdef CONFIG_ARCH_DMA_OPS
const struct dma_map_ops *dma_ops;
#endif
u64 *dma_mask; /* dma mask (if dma'able device) */
@@ -75,7 +75,7 @@ struct dma_map_ops {
unsigned long (*get_merge_boundary)(struct device *dev);
};
-#ifdef CONFIG_DMA_OPS
+#ifdef CONFIG_ARCH_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_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_DMA_OPS */
#ifdef CONFIG_DMA_CMA
extern struct cma *dma_contiguous_default_area;
@@ -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_DMA_OPS || SWIOTLB
config DMA_RESTRICTED_POOL
bool "DMA Restricted Pool"
@@ -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_DMA_OPS) += dummy.o
obj-$(CONFIG_DMA_CMA) += contiguous.o
obj-$(CONFIG_DMA_DECLARE_COHERENT) += coherent.o
obj-$(CONFIG_DMA_API_DEBUG) += debug.o
DMA ops are a helper for architectures and not for drivers to override the DMA implementation. Unfortunately driver authors keep ignoring this. Make this more clear by renaming the symbol to ARCH_DMA_OPS, have the three drivers overriding it depend on that. They should probably also be marked broken, but we can give them a bit of a grace period for that. Signed-off-by: Christoph Hellwig <hch@lst.de> --- 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 | 14 ++++++++++++-- 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, 47 insertions(+), 27 deletions(-)