linux-kernel - Re: Panic on 8-node system in memblock_virt_alloc_try

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Message-ID: <52E21C3B.50107@ti.com>
Date:	Fri, 24 Jan 2014 02:54:35 -0500
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Dave Hansen <dave.hansen@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Panic on 8-node system in memblock_virt_alloc_try_nid()

On Friday 24 January 2014 02:46 AM, Yinghai Lu wrote:
>> OK. So we need '__alloc_bootmem_low()' equivalent memblock API. We will try
>> > to come up with a patch for the same. Thanks for inputs.
> Yes,
> 
> Andrew, can you try attached two patches in your setup?
> 
> Assume your system does not have intel iommu support?
> 
You are fast.. I was cooking up very similar patch as yours.
Thanks for help. Its should mostly fix the issue on Andrew's
box after the revert of commit 5b6e529521
 
> 
> ---
>  arch/arm/kernel/setup.c |    2 +-
>  include/linux/bootmem.h |   37 +++++++++++++++++++++++++++++++++++++
>  lib/swiotlb.c           |    4 ++--
>  3 files changed, 40 insertions(+), 3 deletions(-)
> 
> Index: linux-2.6/include/linux/bootmem.h
> ===================================================================
> --- linux-2.6.orig/include/linux/bootmem.h
> +++ linux-2.6/include/linux/bootmem.h
> @@ -175,6 +175,27 @@ static inline void * __init memblock_vir
>  						    NUMA_NO_NODE);
>  }
>  
> +#ifndef ARCH_LOW_ADDRESS_LIMIT
> +#define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
> +#endif
> +
> +static inline void * __init memblock_virt_alloc_low(
> +                                        phys_addr_t size, phys_addr_t align)
> +{
> +        return memblock_virt_alloc_try_nid(size, align,
> +						   BOOTMEM_LOW_LIMIT,
> +						   ARCH_LOW_ADDRESS_LIMIT,
> +						   NUMA_NO_NODE);
> +}
> +static inline void * __init memblock_virt_alloc_low_nopanic(
> +                                        phys_addr_t size, phys_addr_t align)
> +{
> +        return memblock_virt_alloc_try_nid_nopanic(size, align,
> +						   BOOTMEM_LOW_LIMIT,
> +						   ARCH_LOW_ADDRESS_LIMIT,
> +						   NUMA_NO_NODE);
> +}
> +
>  static inline void * __init memblock_virt_alloc_from_nopanic(
>  		phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
>  {
> @@ -238,6 +259,22 @@ static inline void * __init memblock_vir
>  	return __alloc_bootmem_nopanic(size, align, BOOTMEM_LOW_LIMIT);
>  }
>  
> +static inline void * __init memblock_virt_alloc_low(
> +                                        phys_addr_t size, phys_addr_t align)
> +{
> +	if (!align)
> +		align = SMP_CACHE_BYTES;
> +	return __alloc_bootmem_low(size, align, BOOTMEM_LOW_LIMIT);
> +}
> +
> +static inline void * __init memblock_virt_alloc_low_nopanic(
> +                                        phys_addr_t size, phys_addr_t align)
> +{
> +	if (!align)
> +		align = SMP_CACHE_BYTES;
> +	return __alloc_bootmem_low_nopanic(size, align, BOOTMEM_LOW_LIMIT);
> +}
> +
>  static inline void * __init memblock_virt_alloc_from_nopanic(
>  		phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
>  {
> Index: linux-2.6/lib/swiotlb.c
> ===================================================================
> --- linux-2.6.orig/lib/swiotlb.c
> +++ linux-2.6/lib/swiotlb.c
> @@ -172,7 +172,7 @@ int __init swiotlb_init_with_tbl(char *t
>  	/*
>  	 * Get the overflow emergency buffer
>  	 */
> -	v_overflow_buffer = memblock_virt_alloc_nopanic(
> +	v_overflow_buffer = memblock_virt_alloc_low_nopanic(
>  						PAGE_ALIGN(io_tlb_overflow),
>  						PAGE_SIZE);
>  	if (!v_overflow_buffer)
> @@ -220,7 +220,7 @@ swiotlb_init(int verbose)
>  	bytes = io_tlb_nslabs << IO_TLB_SHIFT;
>  
>  	/* Get IO TLB memory from the low pages */
> -	vstart = memblock_virt_alloc_nopanic(PAGE_ALIGN(bytes), PAGE_SIZE);
> +	vstart = memblock_virt_alloc_low_nopanic(PAGE_ALIGN(bytes), PAGE_SIZE);
>  	if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose))
>  		return;
>  
> Index: linux-2.6/arch/arm/kernel/setup.c
> ===================================================================
> --- linux-2.6.orig/arch/arm/kernel/setup.c
> +++ linux-2.6/arch/arm/kernel/setup.c
> @@ -717,7 +717,7 @@ static void __init request_standard_reso
>  	kernel_data.end     = virt_to_phys(_end - 1);
>  
>  	for_each_memblock(memory, region) {
> -		res = memblock_virt_alloc(sizeof(*res), 0);
> +		res = memblock_virt_alloc_low(sizeof(*res), 0);
>  		res->name  = "System RAM";
>  		res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
>  		res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;

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