Messages in this thread Patch in this message | | | From | Tiezhu Yang <> | Subject | [PATCH] MIPS: Scan the DMI system information | Date | Thu, 7 Nov 2019 00:05:41 +0800 |
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Enable DMI scanning on the MIPS architecture, this setups DMI identifiers (dmi_system_id) for printing it out on task dumps and prepares DIMM entry information (dmi_memdev_info) from the SMBIOS table. With this patch, the driver can easily match various of mainboards.
In the SMBIOS reference specification, the table anchor string "_SM_" is present in the address range 0xF0000 to 0xFFFFF on a 16-byte boundary, but there exists a special case for loongson platform, when call function dmi_early_remap, it should specify the start address to 0xFFFE000 due to it is reserved for SMBIOS and can be normally access in the BIOS.
Co-developed-by: Yinglu Yang <yangyinglu@loongson.cn> Signed-off-by: Yinglu Yang <yangyinglu@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> --- arch/mips/Kconfig | 12 ++++++++++++ arch/mips/include/asm/dmi.h | 43 +++++++++++++++++++++++++++++++++++++++++++ arch/mips/kernel/setup.c | 2 ++ 3 files changed, 57 insertions(+) create mode 100644 arch/mips/include/asm/dmi.h
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 7cb8947..0a67b18 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2757,6 +2757,18 @@ config HW_PERF_EVENTS Enable hardware performance counter support for perf events. If disabled, perf events will use software events only. +# Mark as expert because too many people got it wrong. +# The code disables itself when not needed. +config DMI + default y + select DMI_SCAN_MACHINE_NON_EFI_FALLBACK + bool "Enable DMI scanning" if EXPERT + help + Enabled scanning of DMI to identify machine quirks. Say Y + here unless you have verified that your setup is not + affected by entries in the DMI blacklist. Required by PNP + BIOS code. + config SMP bool "Multi-Processing support" depends on SYS_SUPPORTS_SMP diff --git a/arch/mips/include/asm/dmi.h b/arch/mips/include/asm/dmi.h new file mode 100644 index 0000000..1f3da37 --- /dev/null +++ b/arch/mips/include/asm/dmi.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_MIPS_DMI_H +#define _ASM_MIPS_DMI_H + +#define dmi_early_remap mips_early_memremap +#define dmi_early_unmap mips_early_memunmap +#define dmi_remap(_x, _l) mips_memremap(_x, _l, MEMREMAP_WB) +#define dmi_unmap(_x) mips_memunmap(_x) + +#define dmi_alloc(l) memblock_alloc_low(l, PAGE_SIZE) + +void __init *mips_early_memremap(resource_size_t phys_addr, unsigned long size) +{ +#if defined(CONFIG_MACH_LOONGSON64) + if (phys_addr == 0xF0000) + phys_addr = 0xFFFE000; + + return (void *)TO_CAC(phys_addr); +#else + return NULL; +#endif +} + +void __init mips_early_memunmap(void *addr, unsigned long size) +{ + +} + +void *mips_memremap(resource_size_t offset, size_t size, unsigned long flags) +{ +#if defined(CONFIG_MACH_LOONGSON64) + return (void *)TO_CAC(offset); +#else + return NULL; +#endif +} + +void mips_memunmap(void *addr) +{ + +} + +#endif /* _ASM_MIPS_DMI_H */ diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index c3d4212..da7d312 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -28,6 +28,7 @@ #include <linux/decompress/generic.h> #include <linux/of_fdt.h> #include <linux/of_reserved_mem.h> +#include <linux/dmi.h> #include <asm/addrspace.h> #include <asm/bootinfo.h> @@ -802,6 +803,7 @@ void __init setup_arch(char **cmdline_p) #endif arch_mem_init(cmdline_p); + dmi_setup(); resource_init(); plat_smp_setup(); -- 2.1.0
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