diff options
Diffstat (limited to 'target/linux/generic/pending-4.14/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch')
| -rw-r--r-- | target/linux/generic/pending-4.14/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/target/linux/generic/pending-4.14/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch b/target/linux/generic/pending-4.14/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch deleted file mode 100644 index 6f5f11350a..0000000000 --- a/target/linux/generic/pending-4.14/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch +++ /dev/null @@ -1,140 +0,0 @@ -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 -@@ -1129,6 +1131,9 @@ config DMA_NONCOHERENT - bool - select NEED_DMA_MAP_STATE - -+config DMA_UNMAP_POST_FLUSH -+ bool -+ - config NEED_DMA_MAP_STATE - bool - -@@ -1653,6 +1658,7 @@ 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. - -@@ -1901,9 +1907,11 @@ 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 -@@ -1913,6 +1921,7 @@ 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 - }; |