Use _DMA defined in ACPI spec for translation between DMA address and CPU address, and implement acpi_arch_dma_setup for initializing dev->dma_range_map, where acpi_dma_get_range is called for parsing _DMA. e.g. If we have two dma ranges: cpu address dma address size offset 0x200080000000 0x2080000000 0x400000000 0x1fe000000000 0x400080000000 0x4080000000 0x400000000 0x3fc000000000 _DMA for pci devices should be declared in host bridge as flowing: Name (_DMA, ResourceTemplate() { QWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, NonCacheable, ReadWrite, 0x0, 0x4080000000, 0x447fffffff, 0x3fc000000000, 0x400000000, , , ) QWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, NonCacheable, ReadWrite, 0x0, 0x2080000000, 0x247fffffff, 0x1fe000000000, 0x400000000, , , ) }) Acked-by: Huacai Chen <chenhuacai@xxxxxxxxxxx> Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx> --- arch/loongarch/Kconfig | 1 - arch/loongarch/kernel/dma.c | 52 ++++++++++++++--------------------- arch/loongarch/kernel/setup.c | 2 +- include/linux/acpi.h | 9 ++++-- 4 files changed, 28 insertions(+), 36 deletions(-) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index c7dd6ad779af..551dd99e98b8 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -10,7 +10,6 @@ config LOONGARCH select ARCH_ENABLE_MEMORY_HOTPLUG select ARCH_ENABLE_MEMORY_HOTREMOVE select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI - select ARCH_HAS_PHYS_TO_DMA select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_INLINE_READ_LOCK if !PREEMPTION diff --git a/arch/loongarch/kernel/dma.c b/arch/loongarch/kernel/dma.c index 8c9b5314a13e..7a9c6a9dd2d0 100644 --- a/arch/loongarch/kernel/dma.c +++ b/arch/loongarch/kernel/dma.c @@ -2,39 +2,29 @@ /* * Copyright (C) 2020-2022 Loongson Technology Corporation Limited */ -#include <linux/init.h> +#include <linux/acpi.h> #include <linux/dma-direct.h> -#include <linux/dma-mapping.h> -#include <linux/dma-map-ops.h> -#include <linux/swiotlb.h> -#include <asm/bootinfo.h> -#include <asm/dma.h> -#include <asm/loongson.h> - -/* - * We extract 4bit node id (bit 44~47) from Loongson-3's - * 48bit physical address space and embed it into 40bit. - */ - -static int node_id_offset; - -dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) -{ - long nid = (paddr >> 44) & 0xf; - - return ((nid << 44) ^ paddr) | (nid << node_id_offset); -} - -phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) +void acpi_arch_dma_setup(struct device *dev) { - long nid = (daddr >> node_id_offset) & 0xf; + int ret; + u64 mask, end = 0; + const struct bus_dma_region *map = NULL; + + ret = acpi_dma_get_range(dev, &map); + if (!ret && map) { + const struct bus_dma_region *r = map; + + for (end = 0; r->size; r++) { + if (r->dma_start + r->size - 1 > end) + end = r->dma_start + r->size - 1; + } + + mask = DMA_BIT_MASK(ilog2(end) + 1); + dev->bus_dma_limit = end; + dev->dma_range_map = map; + dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); + *dev->dma_mask = min(*dev->dma_mask, mask); + } - return ((nid << node_id_offset) ^ daddr) | (nid << 44); -} - -void __init plat_swiotlb_setup(void) -{ - swiotlb_init(true, SWIOTLB_VERBOSE); - node_id_offset = ((readl(LS7A_DMA_CFG) & LS7A_DMA_NODE_MASK) >> LS7A_DMA_NODE_SHF) + 36; } diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c index 8f5c2f9a1a83..d97c69dbe553 100644 --- a/arch/loongarch/kernel/setup.c +++ b/arch/loongarch/kernel/setup.c @@ -247,7 +247,7 @@ static void __init arch_mem_init(char **cmdline_p) sparse_init(); memblock_set_bottom_up(true); - plat_swiotlb_setup(); + swiotlb_init(true, SWIOTLB_VERBOSE); dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index bb41623dab77..a71d73a0d43e 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -279,14 +279,17 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) { } void acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa); +#if defined(CONFIG_ARM64) || defined(CONFIG_LOONGARCH) +void acpi_arch_dma_setup(struct device *dev); +#else +static inline void acpi_arch_dma_setup(struct device *dev) { } +#endif + #ifdef CONFIG_ARM64 void acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa); -void acpi_arch_dma_setup(struct device *dev); #else static inline void acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa) { } -static inline void -acpi_arch_dma_setup(struct device *dev) { } #endif int acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma); -- 2.31.1