diff options
Diffstat (limited to 'target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch')
| -rw-r--r-- | target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch | 160 |
1 files changed, 51 insertions, 109 deletions
diff --git a/target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch b/target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch index de2dd65b17..44d1520639 100644 --- a/target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch +++ b/target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch @@ -1,140 +1,82 @@ -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 +From 203f17906ff45705fbdaa0430dbbc71142c2640f Mon Sep 17 00:00:00 2001 +From: Hauke Mehrtens <hauke@hauke-m.de> +Date: Sat, 8 Dec 2018 21:45:53 +0100 +Subject: [PATCH 1/3] MIPS: Compile post DMA flush only when needed -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. +dma_sync_phys() is only called for some CPUs when a mapping is removed. +Add ARCH_HAS_SYNC_DMA_FOR_CPU only for the CPUs listed in +cpu_needs_post_dma_flush() which need this extra call and do not compile +this code in for other CPUs. We need this for R10000, R12000, BMIPS5000 +CPUs and CPUs supporting MAAR which was introduced in MIPS32r5. -With this patch they are compiled out to improve icache footprint -on devices that handle lots of DMA traffic (especially network routers). +This will hopefully improve the performance of the not affected devices. -Signed-off-by: Felix Fietkau <nbd@nbd.name> +Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> --- + arch/mips/Kconfig | 6 +++++- + arch/mips/mm/dma-noncoherent.c | 2 ++ + 2 files changed, 7 insertions(+), 1 deletion(-) --- 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 +@@ -1113,7 +1113,6 @@ config DMA_PERDEV_COHERENT + config DMA_NONCOHERENT bool + select ARCH_HAS_SYNC_DMA_FOR_DEVICE +- select ARCH_HAS_SYNC_DMA_FOR_CPU 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 + select DMA_NONCOHERENT_MMAP + select DMA_NONCOHERENT_CACHE_SYNC +@@ -1894,9 +1893,11 @@ config SYS_HAS_CPU_MIPS32_R3_5 config SYS_HAS_CPU_MIPS32_R5 -+ select DMA_UNMAP_POST_FLUSH bool ++ select ARCH_HAS_SYNC_DMA_FOR_CPU config SYS_HAS_CPU_MIPS32_R6 -+ select DMA_UNMAP_POST_FLUSH bool ++ select ARCH_HAS_SYNC_DMA_FOR_CPU config SYS_HAS_CPU_MIPS64_R1 -@@ -1912,6 +1920,7 @@ config SYS_HAS_CPU_MIPS64_R2 bool +@@ -1906,6 +1907,7 @@ config SYS_HAS_CPU_MIPS64_R2 config SYS_HAS_CPU_MIPS64_R6 -+ select DMA_UNMAP_POST_FLUSH bool ++ select ARCH_HAS_SYNC_DMA_FOR_CPU 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); - } + bool +@@ -1942,6 +1944,7 @@ config SYS_HAS_CPU_R8000 --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; - } + config SYS_HAS_CPU_R10000 + bool ++ select ARCH_HAS_SYNC_DMA_FOR_CPU --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 - } + config SYS_HAS_CPU_RM7000 + bool +@@ -1970,6 +1973,7 @@ config SYS_HAS_CPU_BMIPS4380 + config SYS_HAS_CPU_BMIPS5000 + bool + select SYS_HAS_CPU_BMIPS ++ select ARCH_HAS_SYNC_DMA_FOR_CPU + + config SYS_HAS_CPU_XLR + bool +--- a/arch/mips/mm/dma-noncoherent.c ++++ b/arch/mips/mm/dma-noncoherent.c +@@ -191,12 +191,14 @@ void arch_sync_dma_for_device(struct dev + dma_sync_phys(paddr, size, dir); } --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) ++#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU + void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) { 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); + dma_sync_phys(paddr, size, dir); } - --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 - }; + + void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction) |