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/*
* 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_var_t node_to_cpumask_map[MAX_NUMNODES];
EXPORT_SYMBOL(node_to_cpumask_map);
const struct numa_mode numa_mode_plain = {
.name = "plain",
};
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;
}
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), 1);
if (!res)
panic("Could not allocate memory for node data!\n");
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);
if (mode->setup)
mode->setup();
numa_setup_memory();
memblock_dump_all();
}
/*
* numa_init_early() - Initialization initcall
*
* This runs when only one CPU is online and before the first
* topology update is called for by the scheduler.
*/
static int __init numa_init_early(void)
{
/* Attach all possible CPUs to node 0 for now. */
cpumask_copy(node_to_cpumask_map[0], cpu_possible_mask);
return 0;
}
early_initcall(numa_init_early);
/*
* 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;
}
device_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;
return 0;
}
early_param("numa", parse_numa);
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