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Message-ID: <CAAhV-H4P=MsH2B29U+x4TWJpN4s_2ZYLsX5_rfaapPxx9+UmPQ@mail.gmail.com>
Date: Mon, 5 Sep 2022 22:42:09 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Jianmin Lv <lvjianmin@...ngson.cn>
Cc: lpieralisi@...nel.org, Robin Murphy <robin.murphy@....com>,
Huacai Chen <chenhuacai@...ngson.cn>,
Hanjun Guo <guohanjun@...wei.com>,
Sudeep Holla <sudeep.holla@....com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>,
Robert Moore <robert.moore@...el.com>,
LKML <linux-kernel@...r.kernel.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
loongarch@...ts.linux.dev
Subject: Re: [PATCH V3 2/2] LoongArch: Remove ARCH_HAS_PHYS_TO_DMA
Hi, Jianmin,
The title can be "LoongArch: Use acpi_arch_dma_setup() and remove
ARCH_HAS_PHYS_TO_DMA", and please use resource_size() as arm64.
Acked-by: Huacai Chen <chenhuacai@...ngson.cn>
Huacai
On Tue, Aug 30, 2022 at 11:01 AM Jianmin Lv <lvjianmin@...ngson.cn> wrote:
>
> 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,
> ,
> ,
> )
> })
>
> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
> ---
> 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 b57daee..9dedcf9 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -7,7 +7,6 @@ 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 8c9b531..7a9c6a9 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 c74860b..974f085 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 34e0545..33977b87 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -278,14 +278,17 @@ int acpi_table_parse_madt(enum acpi_madt_type id,
>
> 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);
> --
> 1.8.3.1
>
>
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