c764b2b531
Refreshed all patches. Compile-tested on: ar71xx, cns3xxx, imx6, x86_64 Runtime-tested on: ar71xx, cns3xxx, imx6, x86_64 Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
140 lines
4.3 KiB
Diff
140 lines
4.3 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
|
|
Date: Tue, 5 Dec 2017 12:46:01 +0100
|
|
Subject: [PATCH] MIPS: mm: remove no-op dma_map_ops where possible
|
|
|
|
If no post-DMA flush is required, and the platform does not provide
|
|
plat_unmap_dma_mem(), there is no need to include unmap or sync_for_cpu
|
|
ops.
|
|
|
|
With this patch they are compiled out to improve icache footprint
|
|
on devices that handle lots of DMA traffic (especially network routers).
|
|
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
|
|
--- a/arch/mips/Kconfig
|
|
+++ b/arch/mips/Kconfig
|
|
@@ -221,6 +221,7 @@ config BMIPS_GENERIC
|
|
select BRCMSTB_L2_IRQ
|
|
select IRQ_MIPS_CPU
|
|
select DMA_NONCOHERENT
|
|
+ select DMA_UNMAP_POST_FLUSH
|
|
select SYS_SUPPORTS_32BIT_KERNEL
|
|
select SYS_SUPPORTS_LITTLE_ENDIAN
|
|
select SYS_SUPPORTS_BIG_ENDIAN
|
|
@@ -346,6 +347,7 @@ config MACH_JAZZ
|
|
select CSRC_R4K
|
|
select DEFAULT_SGI_PARTITION if CPU_BIG_ENDIAN
|
|
select GENERIC_ISA_DMA
|
|
+ select DMA_UNMAP_POST_FLUSH
|
|
select HAVE_PCSPKR_PLATFORM
|
|
select IRQ_MIPS_CPU
|
|
select I8253
|
|
@@ -1128,6 +1130,9 @@ config DMA_NONCOHERENT
|
|
bool
|
|
select NEED_DMA_MAP_STATE
|
|
|
|
+config DMA_UNMAP_POST_FLUSH
|
|
+ bool
|
|
+
|
|
config NEED_DMA_MAP_STATE
|
|
bool
|
|
|
|
@@ -1652,6 +1657,7 @@ config CPU_R10000
|
|
select CPU_SUPPORTS_64BIT_KERNEL
|
|
select CPU_SUPPORTS_HIGHMEM
|
|
select CPU_SUPPORTS_HUGEPAGES
|
|
+ select DMA_UNMAP_POST_FLUSH
|
|
help
|
|
MIPS Technologies R10000-series processors.
|
|
|
|
@@ -1900,9 +1906,11 @@ config SYS_HAS_CPU_MIPS32_R3_5
|
|
bool
|
|
|
|
config SYS_HAS_CPU_MIPS32_R5
|
|
+ select DMA_UNMAP_POST_FLUSH
|
|
bool
|
|
|
|
config SYS_HAS_CPU_MIPS32_R6
|
|
+ select DMA_UNMAP_POST_FLUSH
|
|
bool
|
|
|
|
config SYS_HAS_CPU_MIPS64_R1
|
|
@@ -1912,6 +1920,7 @@ config SYS_HAS_CPU_MIPS64_R2
|
|
bool
|
|
|
|
config SYS_HAS_CPU_MIPS64_R6
|
|
+ select DMA_UNMAP_POST_FLUSH
|
|
bool
|
|
|
|
config SYS_HAS_CPU_R3000
|
|
--- a/arch/mips/mm/dma-default.c
|
|
+++ b/arch/mips/mm/dma-default.c
|
|
@@ -267,8 +267,9 @@ static inline void __dma_sync(struct pag
|
|
} while (left);
|
|
}
|
|
|
|
-static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
|
|
- size_t size, enum dma_data_direction direction, unsigned long attrs)
|
|
+static void __maybe_unused
|
|
+mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
|
|
+ enum dma_data_direction direction, unsigned long attrs)
|
|
{
|
|
if (cpu_needs_post_dma_flush(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
__dma_sync(dma_addr_to_page(dev, dma_addr),
|
|
@@ -308,9 +309,10 @@ static dma_addr_t mips_dma_map_page(stru
|
|
return plat_map_dma_mem_page(dev, page) + offset;
|
|
}
|
|
|
|
-static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|
- int nhwentries, enum dma_data_direction direction,
|
|
- unsigned long attrs)
|
|
+static void __maybe_unused
|
|
+mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|
+ int nhwentries, enum dma_data_direction direction,
|
|
+ unsigned long attrs)
|
|
{
|
|
int i;
|
|
struct scatterlist *sg;
|
|
@@ -325,8 +327,9 @@ static void mips_dma_unmap_sg(struct dev
|
|
}
|
|
}
|
|
|
|
-static void mips_dma_sync_single_for_cpu(struct device *dev,
|
|
- dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
|
|
+static void __maybe_unused
|
|
+mips_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
|
|
+ size_t size, enum dma_data_direction direction)
|
|
{
|
|
if (cpu_needs_post_dma_flush(dev))
|
|
__dma_sync(dma_addr_to_page(dev, dma_handle),
|
|
@@ -342,9 +345,9 @@ static void mips_dma_sync_single_for_dev
|
|
dma_handle & ~PAGE_MASK, size, direction);
|
|
}
|
|
|
|
-static void mips_dma_sync_sg_for_cpu(struct device *dev,
|
|
- struct scatterlist *sglist, int nelems,
|
|
- enum dma_data_direction direction)
|
|
+static void __maybe_unused
|
|
+mips_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist,
|
|
+ int nelems, enum dma_data_direction direction)
|
|
{
|
|
int i;
|
|
struct scatterlist *sg;
|
|
@@ -394,12 +397,14 @@ static const struct dma_map_ops mips_def
|
|
.free = mips_dma_free_coherent,
|
|
.mmap = mips_dma_mmap,
|
|
.map_page = mips_dma_map_page,
|
|
- .unmap_page = mips_dma_unmap_page,
|
|
.map_sg = mips_dma_map_sg,
|
|
+#ifdef CONFIG_DMA_UNMAP_POST_FLUSH
|
|
+ .unmap_page = mips_dma_unmap_page,
|
|
.unmap_sg = mips_dma_unmap_sg,
|
|
.sync_single_for_cpu = mips_dma_sync_single_for_cpu,
|
|
- .sync_single_for_device = mips_dma_sync_single_for_device,
|
|
.sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
|
|
+#endif
|
|
+ .sync_single_for_device = mips_dma_sync_single_for_device,
|
|
.sync_sg_for_device = mips_dma_sync_sg_for_device,
|
|
.dma_supported = mips_dma_supported
|
|
};
|