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x86: make NUMA work on 32-bit

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The DISCONTIG memory model on x86 32 bit uses a remap allocator early
in boot. The objective is that portions of every node are mapped in to
the kernel virtual area (KVA) in place of ZONE_NORMAL so that node-local
allocations can be made for pgdat and mem_map structures.

With SPARSEMEM, the amount that is set aside is insufficient for all the
mem_maps to be allocated. During the boot process, it falls back to using
the bootmem allocator. This breaks assumptions that SPARSEMEM makes about
the layout of the mem_map in memory and results in a VM_BUG_ON triggering
due to pfn_to_page() returning garbage values.

This patch only enables the remap allocator for use with DISCONTIG.

Without SRAT support, a compile-error occurs because ACPI table parsing
functions are only available in x86-64. This patch also adds no-op stubs
and prints a warning message. What likely needs to be done is sharing
the table parsing functions between 32 and 64 bit if they are
compatible.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Mel Gorman 2008-01-30 13:33:25 +01:00 committed by Ingo Molnar
parent a5ff677c2f
commit 1b000a5dbe
1 changed files with 78 additions and 15 deletions
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93
arch/x86/mm/discontig_32.c
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@ -32,6 +32,7 @@
#include <linux/kexec.h>
#include <linux/pfn.h>
#include <linux/swap.h>
#include <linux/acpi.h>
#include <asm/e820.h>
#include <asm/setup.h>
@ -103,14 +104,10 @@ extern unsigned long highend_pfn, highstart_pfn;
#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
static unsigned long node_remap_start_pfn[MAX_NUMNODES];
unsigned long node_remap_size[MAX_NUMNODES];
static unsigned long node_remap_offset[MAX_NUMNODES];
static void *node_remap_start_vaddr[MAX_NUMNODES];
void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
static void *node_remap_end_vaddr[MAX_NUMNODES];
static void *node_remap_alloc_vaddr[MAX_NUMNODES];
static unsigned long kva_start_pfn;
static unsigned long kva_pages;
/*
@ -167,6 +164,22 @@ static void __init allocate_pgdat(int nid)
}
}
#ifdef CONFIG_DISCONTIGMEM
/*
* In the discontig memory model, a portion of the kernel virtual area (KVA)
* is reserved and portions of nodes are mapped using it. This is to allow
* node-local memory to be allocated for structures that would normally require
* ZONE_NORMAL. The memory is allocated with alloc_remap() and callers
* should be prepared to allocate from the bootmem allocator instead. This KVA
* mechanism is incompatible with SPARSEMEM as it makes assumptions about the
* layout of memory that are broken if alloc_remap() succeeds for some of the
* map and fails for others
*/
static unsigned long node_remap_start_pfn[MAX_NUMNODES];
static void *node_remap_end_vaddr[MAX_NUMNODES];
static void *node_remap_alloc_vaddr[MAX_NUMNODES];
static unsigned long node_remap_offset[MAX_NUMNODES];
void *alloc_remap(int nid, unsigned long size)
{
void *allocation = node_remap_alloc_vaddr[nid];
@ -263,6 +276,40 @@ static unsigned long calculate_numa_remap_pages(void)
return reserve_pages;
}
static void init_remap_allocator(int nid)
{
node_remap_start_vaddr[nid] = pfn_to_kaddr(
kva_start_pfn + node_remap_offset[nid]);
node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
(node_remap_size[nid] * PAGE_SIZE);
node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
ALIGN(sizeof(pg_data_t), PAGE_SIZE);
printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
(ulong) node_remap_start_vaddr[nid],
(ulong) pfn_to_kaddr(highstart_pfn
+ node_remap_offset[nid] + node_remap_size[nid]));
}
#else
void *alloc_remap(int nid, unsigned long size)
{
return NULL;
}
static unsigned long calculate_numa_remap_pages(void)
{
return 0;
}
static void init_remap_allocator(int nid)
{
}
void __init remap_numa_kva(void)
{
}
#endif /* CONFIG_DISCONTIGMEM */
extern void setup_bootmem_allocator(void);
unsigned long __init setup_memory(void)
{
@ -326,19 +373,9 @@ unsigned long __init setup_memory(void)
printk("Low memory ends at vaddr %08lx\n",
(ulong) pfn_to_kaddr(max_low_pfn));
for_each_online_node(nid) {
node_remap_start_vaddr[nid] = pfn_to_kaddr(
kva_start_pfn + node_remap_offset[nid]);
/* Init the node remap allocator */
node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
(node_remap_size[nid] * PAGE_SIZE);
node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
ALIGN(sizeof(pg_data_t), PAGE_SIZE);
init_remap_allocator(nid);
allocate_pgdat(nid);
printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
(ulong) node_remap_start_vaddr[nid],
(ulong) pfn_to_kaddr(highstart_pfn
+ node_remap_offset[nid] + node_remap_size[nid]));
}
printk("High memory starts at vaddr %08lx\n",
(ulong) pfn_to_kaddr(highstart_pfn));
@ -439,3 +476,29 @@ int memory_add_physaddr_to_nid(u64 addr)
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
#ifndef CONFIG_HAVE_ARCH_PARSE_SRAT
/*
* XXX FIXME: Make SLIT table parsing available to 32-bit NUMA
*
* These stub functions are needed to compile 32-bit NUMA when SRAT is
* not set. There are functions in srat_64.c for parsing this table
* and it may be possible to make them common functions.
*/
void acpi_numa_slit_init (struct acpi_table_slit *slit)
{
printk(KERN_INFO "ACPI: No support for parsing SLIT table\n");
}
void acpi_numa_processor_affinity_init (struct acpi_srat_cpu_affinity *pa)
{
}
void acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma)
{
}
void acpi_numa_arch_fixup(void)
{
}
#endif /* CONFIG_HAVE_ARCH_PARSE_SRAT */