linux-kernel - Re: [PATCH 2/2] MIPS: Add fix_range_node after parse "mem=" parameter

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Date:   Thu, 03 Dec 2020 17:27:45 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Jinyang He <hejinyang@...ngson.cn>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>
CC:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] MIPS: Add fix_range_node after parse "mem=" parameter



于 2020年12月3日 GMT+08:00 下午4:57:47, Jinyang He <hejinyang@...ngson.cn> 写到:
>This problem may only occur on NUMA platforms. When machine start
>with the "mem=" parameter on Loongson64, it cannot boot. When parsing the
>"mem=" parameter, first all the RAM was removed, and then the memory was
>not added by memblock_add_node(), which caused the newly added memory to
>be on MAX_NUMNODES. The key to solve this problem is to fix these memory
>nodes through memblock_set_node() before bootmem_init() or earlier. So
>it would be better to fix it before check_kernel_sections_mem().
>The check_kernel_sections_mem() will check whether the current RAM can be
>used by the kernel. If this fix is added after that, it will do a redundant
>memblock_add operation. Adding the fixup_region_node() function can also
>provide a reference for future platforms using NUMA when encountering
>such problems.

Hi Jingyang,

Is it possible to do it when parsing cmdline to avoid this kind of fixup?

Thanks.

- Jiaxun

>
>Signed-off-by: Jinyang He <hejinyang@...ngson.cn>
>---
> arch/mips/include/asm/bootinfo.h |  1 +
> arch/mips/kernel/setup.c         |  6 +++++-
> arch/mips/loongson64/numa.c      | 11 +++++++++++
> 3 files changed, 17 insertions(+), 1 deletion(-)
>
>diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h
>index aa03b12..ddc17b1 100644
>--- a/arch/mips/include/asm/bootinfo.h
>+++ b/arch/mips/include/asm/bootinfo.h
>@@ -91,6 +91,7 @@ const char *get_system_type(void);
> extern unsigned long mips_machtype;
> 
> extern void detect_memory_region(phys_addr_t start, phys_addr_t sz_min,  phys_addr_t sz_max);
>+extern void fixup_region_node(void);
> 
> extern void prom_init(void);
> extern void prom_free_prom_memory(void);
>diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
>index b3a711e..fe93882 100644
>--- a/arch/mips/kernel/setup.c
>+++ b/arch/mips/kernel/setup.c
>@@ -110,6 +110,8 @@ void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_add
> 	memblock_add(start, size);
> }
> 
>+void __weak fixup_region_node(void) {}
>+
> /*
>  * Manage initrd
>  */
>@@ -631,8 +633,10 @@ static void __init arch_mem_init(char **cmdline_p)
> 
> 	parse_early_param();
> 
>-	if (usermem)
>+	if (usermem) {
> 		pr_info("User-defined physical RAM map overwrite\n");
>+		fixup_region_node();
>+	}
> 
> 	check_kernel_sections_mem();
> 
>diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c
>index c6f0c48..d8661cc 100644
>--- a/arch/mips/loongson64/numa.c
>+++ b/arch/mips/loongson64/numa.c
>@@ -220,6 +220,17 @@ void __init mem_init(void)
> 	mem_init_print_info(NULL);
> }
> 
>+void __init fixup_region_node(void)
>+{
>+	phys_addr_t start, end;
>+	u64 i;
>+
>+	for_each_mem_range(i, &start, &end) {
>+		memblock_set_node(start, end - start,
>+				  &memblock.memory, pa_to_nid(start));
>+	}
>+}
>+
> /* All PCI device belongs to logical Node-0 */
> int pcibus_to_node(struct pci_bus *bus)
> {