179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* NUMA support for s390
|
|
*
|
|
* Implement NUMA core code.
|
|
*
|
|
* Copyright IBM Corp. 2015
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "numa"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/mmzone.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/node.h>
|
|
|
|
#include <asm/numa.h>
|
|
#include "numa_mode.h"
|
|
|
|
pg_data_t *node_data[MAX_NUMNODES];
|
|
EXPORT_SYMBOL(node_data);
|
|
|
|
cpumask_t node_to_cpumask_map[MAX_NUMNODES];
|
|
EXPORT_SYMBOL(node_to_cpumask_map);
|
|
|
|
static void plain_setup(void)
|
|
{
|
|
node_set(0, node_possible_map);
|
|
}
|
|
|
|
const struct numa_mode numa_mode_plain = {
|
|
.name = "plain",
|
|
.setup = plain_setup,
|
|
};
|
|
|
|
static const struct numa_mode *mode = &numa_mode_plain;
|
|
|
|
int numa_pfn_to_nid(unsigned long pfn)
|
|
{
|
|
return mode->__pfn_to_nid ? mode->__pfn_to_nid(pfn) : 0;
|
|
}
|
|
|
|
void numa_update_cpu_topology(void)
|
|
{
|
|
if (mode->update_cpu_topology)
|
|
mode->update_cpu_topology();
|
|
}
|
|
|
|
int __node_distance(int a, int b)
|
|
{
|
|
return mode->distance ? mode->distance(a, b) : 0;
|
|
}
|
|
EXPORT_SYMBOL(__node_distance);
|
|
|
|
int numa_debug_enabled;
|
|
|
|
/*
|
|
* alloc_node_data() - Allocate node data
|
|
*/
|
|
static __init pg_data_t *alloc_node_data(void)
|
|
{
|
|
pg_data_t *res;
|
|
|
|
res = (pg_data_t *) memblock_alloc(sizeof(pg_data_t), 8);
|
|
memset(res, 0, sizeof(pg_data_t));
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* numa_setup_memory() - Assign bootmem to nodes
|
|
*
|
|
* The memory is first added to memblock without any respect to nodes.
|
|
* This is fixed before remaining memblock memory is handed over to the
|
|
* buddy allocator.
|
|
* An important side effect is that large bootmem allocations might easily
|
|
* cross node boundaries, which can be needed for large allocations with
|
|
* smaller memory stripes in each node (i.e. when using NUMA emulation).
|
|
*
|
|
* Memory defines nodes:
|
|
* Therefore this routine also sets the nodes online with memory.
|
|
*/
|
|
static void __init numa_setup_memory(void)
|
|
{
|
|
unsigned long cur_base, align, end_of_dram;
|
|
int nid = 0;
|
|
|
|
end_of_dram = memblock_end_of_DRAM();
|
|
align = mode->align ? mode->align() : ULONG_MAX;
|
|
|
|
/*
|
|
* Step through all available memory and assign it to the nodes
|
|
* indicated by the mode implementation.
|
|
* All nodes which are seen here will be set online.
|
|
*/
|
|
cur_base = 0;
|
|
do {
|
|
nid = numa_pfn_to_nid(PFN_DOWN(cur_base));
|
|
node_set_online(nid);
|
|
memblock_set_node(cur_base, align, &memblock.memory, nid);
|
|
cur_base += align;
|
|
} while (cur_base < end_of_dram);
|
|
|
|
/* Allocate and fill out node_data */
|
|
for (nid = 0; nid < MAX_NUMNODES; nid++)
|
|
NODE_DATA(nid) = alloc_node_data();
|
|
|
|
for_each_online_node(nid) {
|
|
unsigned long start_pfn, end_pfn;
|
|
unsigned long t_start, t_end;
|
|
int i;
|
|
|
|
start_pfn = ULONG_MAX;
|
|
end_pfn = 0;
|
|
for_each_mem_pfn_range(i, nid, &t_start, &t_end, NULL) {
|
|
if (t_start < start_pfn)
|
|
start_pfn = t_start;
|
|
if (t_end > end_pfn)
|
|
end_pfn = t_end;
|
|
}
|
|
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
|
|
NODE_DATA(nid)->node_id = nid;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* numa_setup() - Earliest initialization
|
|
*
|
|
* Assign the mode and call the mode's setup routine.
|
|
*/
|
|
void __init numa_setup(void)
|
|
{
|
|
pr_info("NUMA mode: %s\n", mode->name);
|
|
nodes_clear(node_possible_map);
|
|
/* Initially attach all possible CPUs to node 0. */
|
|
cpumask_copy(&node_to_cpumask_map[0], cpu_possible_mask);
|
|
if (mode->setup)
|
|
mode->setup();
|
|
numa_setup_memory();
|
|
memblock_dump_all();
|
|
}
|
|
|
|
/*
|
|
* numa_init_late() - Initialization initcall
|
|
*
|
|
* Register NUMA nodes.
|
|
*/
|
|
static int __init numa_init_late(void)
|
|
{
|
|
int nid;
|
|
|
|
for_each_online_node(nid)
|
|
register_one_node(nid);
|
|
return 0;
|
|
}
|
|
arch_initcall(numa_init_late);
|
|
|
|
static int __init parse_debug(char *parm)
|
|
{
|
|
numa_debug_enabled = 1;
|
|
return 0;
|
|
}
|
|
early_param("numa_debug", parse_debug);
|
|
|
|
static int __init parse_numa(char *parm)
|
|
{
|
|
if (strcmp(parm, numa_mode_plain.name) == 0)
|
|
mode = &numa_mode_plain;
|
|
#ifdef CONFIG_NUMA_EMU
|
|
if (strcmp(parm, numa_mode_emu.name) == 0)
|
|
mode = &numa_mode_emu;
|
|
#endif
|
|
return 0;
|
|
}
|
|
early_param("numa", parse_numa);
|