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

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Date:   Thu, 3 Dec 2020 17:55:41 +0800
From:   Jinyang He <hejinyang@...ngson.cn>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        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



On 12/03/2020 05:27 PM, Jiaxun Yang wrote:
>
> 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

Hi, Jiaxun,

Of course. But "memmap=" could cause same problem , "mem=" could
parse many times. So it better to fix it after these parse opertion 
having done.

Thanks,
Jinyang.

>> 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)
>> {