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Message-Id: <20130125164036.26cb32f0.akpm@linux-foundation.org>
Date: Fri, 25 Jan 2013 16:40:36 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Tang Chen <tangchen@...fujitsu.com>
Cc: jiang.liu@...wei.com, wujianguo@...wei.com, hpa@...or.com,
wency@...fujitsu.com, laijs@...fujitsu.com, linfeng@...fujitsu.com,
yinghai@...nel.org, isimatu.yasuaki@...fujitsu.com,
rob@...dley.net, kosaki.motohiro@...fujitsu.com,
minchan.kim@...il.com, mgorman@...e.de, rientjes@...gle.com,
guz.fnst@...fujitsu.com, rusty@...tcorp.com.au, lliubbo@...il.com,
jaegeuk.hanse@...il.com, tony.luck@...el.com,
glommer@...allels.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: Re: [PATCH 3/3] acpi, memory-hotplug: Support getting hotplug info
from SRAT.
On Fri, 25 Jan 2013 17:42:09 +0800
Tang Chen <tangchen@...fujitsu.com> wrote:
> We now provide an option for users who don't want to specify physical
> memory address in kernel commandline.
>
> /*
> * For movablemem_map=acpi:
> *
> * SRAT: |_____| |_____| |_________| |_________| ......
> * node id: 0 1 1 2
> * hotpluggable: n y y n
> * movablemem_map: |_____| |_________|
> *
> * Using movablemem_map, we can prevent memblock from allocating memory
> * on ZONE_MOVABLE at boot time.
> */
>
> So user just specify movablemem_map=acpi, and the kernel will use hotpluggable
> info in SRAT to determine which memory ranges should be set as ZONE_MOVABLE.
Well, as a reult of my previous hackery, arch/x86/mm/srat.c now looks
rather different. Please check it carefully and runtime test this code
when it appears in linux-next?
/*
* ACPI 3.0 based NUMA setup
* Copyright 2004 Andi Kleen, SuSE Labs.
*
* Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
*
* Called from acpi_numa_init while reading the SRAT and SLIT tables.
* Assumes all memory regions belonging to a single proximity domain
* are in one chunk. Holes between them will be included in the node.
*/
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/mmzone.h>
#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/topology.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <asm/proto.h>
#include <asm/numa.h>
#include <asm/e820.h>
#include <asm/apic.h>
#include <asm/uv/uv.h>
int acpi_numa __initdata;
static __init int setup_node(int pxm)
{
return acpi_map_pxm_to_node(pxm);
}
static __init void bad_srat(void)
{
printk(KERN_ERR "SRAT: SRAT not used.\n");
acpi_numa = -1;
}
static __init inline int srat_disabled(void)
{
return acpi_numa < 0;
}
/* Callback for SLIT parsing */
void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
{
int i, j;
for (i = 0; i < slit->locality_count; i++)
for (j = 0; j < slit->locality_count; j++)
numa_set_distance(pxm_to_node(i), pxm_to_node(j),
slit->entry[slit->locality_count * i + j]);
}
/* Callback for Proximity Domain -> x2APIC mapping */
void __init
acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
{
int pxm, node;
int apic_id;
if (srat_disabled())
return;
if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
bad_srat();
return;
}
if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
return;
pxm = pa->proximity_domain;
apic_id = pa->apic_id;
if (!apic->apic_id_valid(apic_id)) {
printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
pxm, apic_id);
return;
}
node = setup_node(pxm);
if (node < 0) {
printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
bad_srat();
return;
}
if (apic_id >= MAX_LOCAL_APIC) {
printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
return;
}
set_apicid_to_node(apic_id, node);
node_set(node, numa_nodes_parsed);
acpi_numa = 1;
printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
pxm, apic_id, node);
}
/* Callback for Proximity Domain -> LAPIC mapping */
void __init
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
{
int pxm, node;
int apic_id;
if (srat_disabled())
return;
if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
bad_srat();
return;
}
if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
return;
pxm = pa->proximity_domain_lo;
if (acpi_srat_revision >= 2)
pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
node = setup_node(pxm);
if (node < 0) {
printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
bad_srat();
return;
}
if (get_uv_system_type() >= UV_X2APIC)
apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
else
apic_id = pa->apic_id;
if (apic_id >= MAX_LOCAL_APIC) {
printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
return;
}
set_apicid_to_node(apic_id, node);
node_set(node, numa_nodes_parsed);
acpi_numa = 1;
printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
pxm, apic_id, node);
}
#ifdef CONFIG_MEMORY_HOTPLUG
static inline int save_add_info(void) {return 1;}
#else
static inline int save_add_info(void) {return 0;}
#endif
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
static void __init
handle_movablemem(int node, u64 start, u64 end, u32 hotpluggable)
{
int overlap;
unsigned long start_pfn, end_pfn;
start_pfn = PFN_DOWN(start);
end_pfn = PFN_UP(end);
/*
* For movablemem_map=acpi:
*
* SRAT: |_____| |_____| |_________| |_________| ......
* node id: 0 1 1 2
* hotpluggable: n y y n
* movablemem_map: |_____| |_________|
*
* Using movablemem_map, we can prevent memblock from allocating memory
* on ZONE_MOVABLE at boot time.
*/
if (hotpluggable && movablemem_map.acpi) {
insert_movablemem_map(start_pfn, end_pfn);
goto out;
}
/*
* For movablemem_map=nn[KMG]@ss[KMG]:
*
* SRAT: |_____| |_____| |_________| |_________| ......
* node id: 0 1 1 2
* user specified: |__| |___|
* movablemem_map: |___| |_________| |______| ......
*
* Using movablemem_map, we can prevent memblock from allocating memory
* on ZONE_MOVABLE at boot time.
*
* NOTE: In this case, SRAT info will be ingored.
*/
overlap = movablemem_map_overlap(start_pfn, end_pfn);
if (overlap >= 0) {
/*
* If part of this range is in movablemem_map, we need to
* add the range after it to extend the range to the end
* of the node, because from the min address specified to
* the end of the node will be ZONE_MOVABLE.
*/
start_pfn = max(start_pfn,
movablemem_map.map[overlap].start_pfn);
insert_movablemem_map(start_pfn, end_pfn);
/*
* Set the nodemask, so that if the address range on one node
* is not continuse, we can add the subsequent ranges on the
* same node into movablemem_map.
*/
node_set(node, movablemem_map.numa_nodes_hotplug);
} else {
if (node_isset(node, movablemem_map.numa_nodes_hotplug))
/*
* Insert the range if we already have movable ranges
* on the same node.
*/
insert_movablemem_map(start_pfn, end_pfn);
}
out:
return;
}
#else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static inline void
handle_movablemem(int node, u64 start, u64 end, u32 hotpluggable)
{
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
int __init
acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
{
u64 start, end;
u32 hotpluggable;
int node, pxm;
if (srat_disabled())
goto out_err;
if (ma->header.length != sizeof(struct acpi_srat_mem_affinity))
goto out_err_bad_srat;
if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
goto out_err;
hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
if (hotpluggable && !save_add_info())
goto out_err;
start = ma->base_address;
end = start + ma->length;
pxm = ma->proximity_domain;
if (acpi_srat_revision <= 1)
pxm &= 0xff;
node = setup_node(pxm);
if (node < 0) {
printk(KERN_ERR "SRAT: Too many proximity domains.\n");
goto out_err_bad_srat;
}
if (numa_add_memblk(node, start, end) < 0)
goto out_err_bad_srat;
node_set(node, numa_nodes_parsed);
printk(KERN_INFO "SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx] %s\n",
node, pxm,
(unsigned long long) start, (unsigned long long) end - 1,
hotpluggable ? "Hot Pluggable": "");
handle_movablemem(node, start, end, hotpluggable);
return 0;
out_err_bad_srat:
bad_srat();
out_err:
return -1;
}
void __init acpi_numa_arch_fixup(void) {}
int __init x86_acpi_numa_init(void)
{
int ret;
ret = acpi_numa_init();
if (ret < 0)
return ret;
return srat_disabled() ? -EINVAL : 0;
}
--
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