On Fri, Nov 15, 2019 at 8:55 PM Vignesh Raghavendra <vigne...@ti.com> wrote:
>
> Subsystems such as USB expect dma_map_single() and dma_unmap_single() to
> do dcache flush/invalidate operations as required. For example, see
> drivers/usb/gadget/udc/udc-core.c::usb_gadget_map_request().
> Currently drivers do this locally, (see drivers/usb/dwc3/ep0.c,
> drivers/mtd/nand/raw/denali.c etc..)
> Update arch specific dma_map_single() and dma_unmap_single() APIs to do
> cache flush/invalidate operations, so that drivers need not implement
> them locally.
>
> Signed-off-by: Vignesh Raghavendra <vigne...@ti.com>
Reviewed-by: Masahiro Yamada <yamada.masah...@socionext.com>
> ---
> arch/arm/include/asm/dma-mapping.h | 22 ++++++++++++++++++++--
> arch/nds32/include/asm/dma-mapping.h | 22 ++++++++++++++++++++--
> arch/riscv/include/asm/dma-mapping.h | 22 ++++++++++++++++++++--
> arch/x86/include/asm/dma-mapping.h | 22 ++++++++++++++++++++--
> 4 files changed, 80 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arm/include/asm/dma-mapping.h
> b/arch/arm/include/asm/dma-mapping.h
> index fc5b8f634d54..4b02320dfbd3 100644
> --- a/arch/arm/include/asm/dma-mapping.h
> +++ b/arch/arm/include/asm/dma-mapping.h
> @@ -7,7 +7,10 @@
> #ifndef __ASM_ARM_DMA_MAPPING_H
> #define __ASM_ARM_DMA_MAPPING_H
>
> +#include <common.h>
> +#include <asm/cache.h>
> #include <linux/dma-direction.h>
> +#include <malloc.h>
>
> #define dma_mapping_error(x, y) 0
>
> @@ -25,12 +28,27 @@ static inline void dma_free_coherent(void *addr)
> static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
> enum dma_data_direction dir)
> {
> - return (unsigned long)vaddr;
> + unsigned long addr = (unsigned long)vaddr;
> +
> + len = ALIGN(len, ARCH_DMA_MINALIGN);
> +
> + if (dir == DMA_FROM_DEVICE)
> + invalidate_dcache_range(addr, addr + len);
> + else
> + flush_dcache_range(addr, addr + len);
> +
> + return addr;
> }
>
> static inline void dma_unmap_single(volatile void *vaddr, size_t len,
> - unsigned long paddr)
> + enum dma_data_direction dir)
> {
> + unsigned long addr = (unsigned long)vaddr;
> +
> + len = ALIGN(len, ARCH_DMA_MINALIGN);
> +
> + if (dir != DMA_TO_DEVICE)
> + invalidate_dcache_range(addr, addr + len);
> }
>
> #endif /* __ASM_ARM_DMA_MAPPING_H */
> diff --git a/arch/nds32/include/asm/dma-mapping.h
> b/arch/nds32/include/asm/dma-mapping.h
> index e6808dc84089..33c4582f4614 100644
> --- a/arch/nds32/include/asm/dma-mapping.h
> +++ b/arch/nds32/include/asm/dma-mapping.h
> @@ -6,7 +6,10 @@
> #ifndef __ASM_NDS_DMA_MAPPING_H
> #define __ASM_NDS_DMA_MAPPING_H
>
> +#include <common.h>
> +#include <asm/cache.h>
> #include <linux/dma-direction.h>
> +#include <malloc.h>
>
> static void *dma_alloc_coherent(size_t len, unsigned long *handle)
> {
> @@ -17,12 +20,27 @@ static void *dma_alloc_coherent(size_t len, unsigned long
> *handle)
> static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
> enum dma_data_direction dir)
> {
> - return (unsigned long)vaddr;
> + unsigned long addr = (unsigned long)vaddr;
> +
> + len = ALIGN(len, ARCH_DMA_MINALIGN);
> +
> + if (dir == DMA_FROM_DEVICE)
> + invalidate_dcache_range(addr, addr + len);
> + else
> + flush_dcache_range(addr, addr + len);
> +
> + return addr;
> }
>
> static inline void dma_unmap_single(volatile void *vaddr, size_t len,
> - unsigned long paddr)
> + enum dma_data_direction dir)
> {
> + unsigned long addr = (unsigned long)vaddr;
> +
> + len = ALIGN(len, ARCH_DMA_MINALIGN);
> +
> + if (dir != DMA_TO_DEVICE)
> + invalidate_dcache_range(addr, addr + len);
> }
>
> #endif /* __ASM_NDS_DMA_MAPPING_H */
> diff --git a/arch/riscv/include/asm/dma-mapping.h
> b/arch/riscv/include/asm/dma-mapping.h
> index 3d930c90eceb..01f8a9219a38 100644
> --- a/arch/riscv/include/asm/dma-mapping.h
> +++ b/arch/riscv/include/asm/dma-mapping.h
> @@ -9,7 +9,10 @@
> #ifndef __ASM_RISCV_DMA_MAPPING_H
> #define __ASM_RISCV_DMA_MAPPING_H
>
> +#include <common.h>
> +#include <asm/cache.h>
> #include <linux/dma-direction.h>
> +#include <malloc.h>
>
> #define dma_mapping_error(x, y) 0
>
> @@ -27,12 +30,27 @@ static inline void dma_free_coherent(void *addr)
> static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
> enum dma_data_direction dir)
> {
> - return (unsigned long)vaddr;
> + unsigned long addr = (unsigned long)vaddr;
> +
> + len = ALIGN(len, ARCH_DMA_MINALIGN);
> +
> + if (dir == DMA_FROM_DEVICE)
> + invalidate_dcache_range(addr, addr + len);
> + else
> + flush_dcache_range(addr, addr + len);
> +
> + return addr;
> }
>
> static inline void dma_unmap_single(volatile void *vaddr, size_t len,
> - unsigned long paddr)
> + enum dma_data_direction dir)
> {
> + unsigned long addr = (unsigned long)vaddr;
> +
> + len = ALIGN(len, ARCH_DMA_MINALIGN);
> +
> + if (dir != DMA_TO_DEVICE)
> + invalidate_dcache_range(addr, addr + len);
> }
>
> #endif /* __ASM_RISCV_DMA_MAPPING_H */
> diff --git a/arch/x86/include/asm/dma-mapping.h
> b/arch/x86/include/asm/dma-mapping.h
> index b353ff0bef59..c228f684665f 100644
> --- a/arch/x86/include/asm/dma-mapping.h
> +++ b/arch/x86/include/asm/dma-mapping.h
> @@ -7,7 +7,10 @@
> #ifndef __ASM_X86_DMA_MAPPING_H
> #define __ASM_X86_DMA_MAPPING_H
>
> +#include <common.h>
> +#include <asm/cache.h>
> #include <linux/dma-direction.h>
> +#include <malloc.h>
>
> #define dma_mapping_error(x, y) 0
>
> @@ -25,12 +28,27 @@ static inline void dma_free_coherent(void *addr)
> static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
> enum dma_data_direction dir)
> {
> - return (unsigned long)vaddr;
> + unsigned long addr = (unsigned long)vaddr;
> +
> + len = ALIGN(len, ARCH_DMA_MINALIGN);
> +
> + if (dir == DMA_FROM_DEVICE)
> + invalidate_dcache_range(addr, addr + len);
> + else
> + flush_dcache_range(addr, addr + len);
> +
> + return addr;
> }
>
> static inline void dma_unmap_single(volatile void *vaddr, size_t len,
> - unsigned long paddr)
> + enum dma_data_direction dir)
> {
> + unsigned long addr = (unsigned long)vaddr;
> +
> + len = ALIGN(len, ARCH_DMA_MINALIGN);
> +
> + if (dir != DMA_TO_DEVICE)
> + invalidate_dcache_range(addr, addr + len);
> }
>
> #endif /* __ASM_X86_DMA_MAPPING_H */
> --
> 2.24.0
>
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--
Best Regards
Masahiro Yamada
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