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Merge tag 'dma-mapping-5.2' of git://git.infradead.org/users/hch/dma-mapping

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Pull DMA mapping updates from Christoph Hellwig:

 - remove the already broken support for NULL dev arguments to the DMA
   API calls

 - Kconfig tidyups

* tag 'dma-mapping-5.2' of git://git.infradead.org/users/hch/dma-mapping:
  dma-mapping: add a Kconfig symbol to indicate arch_dma_prep_coherent presence
  dma-mapping: remove an unnecessary NULL check
  x86/dma: Remove the x86_dma_fallback_dev hack
  dma-mapping: remove leftover NULL device support
  arm: use a dummy struct device for ISA DMA use of the DMA API
  pxa3xx-gcu: pass struct device to dma_mmap_coherent
  gbefb: switch to managed version of the DMA allocator
  da8xx-fb: pass struct device to DMA API functions
  parport_ip32: pass struct device to DMA API functions
  dma: select GENERIC_ALLOCATOR for DMA_REMAP
This commit is contained in:
Linus Torvalds
2019-05-09 08:40:55 -07:00
parent e57ccca1ba 13bf5ced93
commit ddab5337b2
17 changed files with 65 additions and 88 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm/kernel/dma-isa.c
View File

@@ -55,6 +55,12 @@ static int isa_get_dma_residue(unsigned int chan, dma_t *dma)
return chan < 4 ? count : (count << 1);
}
static struct device isa_dma_dev = {
.init_name = "fallback device",
.coherent_dma_mask = ~(dma_addr_t)0,
.dma_mask = &isa_dma_dev.coherent_dma_mask,
};
static void isa_enable_dma(unsigned int chan, dma_t *dma)
{
if (dma->invalid) {
@@ -89,7 +95,7 @@ static void isa_enable_dma(unsigned int chan, dma_t *dma)
dma->sg = &dma->buf;
dma->sgcount = 1;
dma->buf.length = dma->count;
dma->buf.dma_address = dma_map_single(NULL,
dma->buf.dma_address = dma_map_single(&isa_dma_dev,
dma->addr, dma->count,
direction);
}

8
arch/arm/mach-rpc/dma.c
View File

@@ -151,6 +151,12 @@ static void iomd_free_dma(unsigned int chan, dma_t *dma)
free_irq(idma->irq, idma);
}
static struct device isa_dma_dev = {
.init_name = "fallback device",
.coherent_dma_mask = ~(dma_addr_t)0,
.dma_mask = &isa_dma_dev.coherent_dma_mask,
};
static void iomd_enable_dma(unsigned int chan, dma_t *dma)
{
struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
@@ -168,7 +174,7 @@ static void iomd_enable_dma(unsigned int chan, dma_t *dma)
idma->dma.sg = &idma->dma.buf;
idma->dma.sgcount = 1;
idma->dma.buf.length = idma->dma.count;
idma->dma.buf.dma_address = dma_map_single(NULL,
idma->dma.buf.dma_address = dma_map_single(&isa_dma_dev,
idma->dma.addr, idma->dma.count,
idma->dma.dma_mode == DMA_MODE_READ ?
DMA_FROM_DEVICE : DMA_TO_DEVICE);

1
arch/arm64/Kconfig
View File

@@ -13,6 +13,7 @@ config ARM64
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_DMA_COHERENT_TO_PFN
select ARCH_HAS_DMA_MMAP_PGPROT
select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FAST_MULTIPLIER

1
arch/csky/Kconfig
View File

@@ -1,6 +1,7 @@
config CSKY
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_USE_BUILTIN_BSWAP

10
arch/x86/include/asm/dma-mapping.h
View File

@@ -13,14 +13,7 @@
#include <asm/swiotlb.h>
#include <linux/dma-contiguous.h>
#ifdef CONFIG_ISA
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
#else
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
#endif
extern int iommu_merge;
extern struct device x86_dma_fallback_dev;
extern int panic_on_overflow;
extern const struct dma_map_ops *dma_ops;
@@ -30,7 +23,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return dma_ops;
}
bool arch_dma_alloc_attrs(struct device **dev);
#define arch_dma_alloc_attrs arch_dma_alloc_attrs
#endif

6
arch/x86/kernel/amd_gart_64.c
View File

@@ -233,9 +233,6 @@ static dma_addr_t gart_map_page(struct device *dev, struct page *page,
unsigned long bus;
phys_addr_t paddr = page_to_phys(page) + offset;
if (!dev)
dev = &x86_dma_fallback_dev;
if (!need_iommu(dev, paddr, size))
return paddr;
@@ -392,9 +389,6 @@ static int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents,
if (nents == 0)
return 0;
if (!dev)
dev = &x86_dma_fallback_dev;
out = 0;
start = 0;
start_sg = sg;

20
arch/x86/kernel/pci-dma.c
View File

@@ -51,14 +51,6 @@ int iommu_pass_through __read_mostly;
extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
/* Dummy device used for NULL arguments (normally ISA). */
struct device x86_dma_fallback_dev = {
.init_name = "fallback device",
.coherent_dma_mask = ISA_DMA_BIT_MASK,
.dma_mask = &x86_dma_fallback_dev.coherent_dma_mask,
};
EXPORT_SYMBOL(x86_dma_fallback_dev);
void __init pci_iommu_alloc(void)
{
struct iommu_table_entry *p;
@@ -77,18 +69,6 @@ void __init pci_iommu_alloc(void)
}
}
bool arch_dma_alloc_attrs(struct device **dev)
{
if (!*dev)
*dev = &x86_dma_fallback_dev;
if (!is_device_dma_capable(*dev))
return false;
return true;
}
EXPORT_SYMBOL(arch_dma_alloc_attrs);
/*
* See <Documentation/x86/x86_64/boot-options.txt> for the iommu kernel
* parameter documentation.