/*
* This file is subject to the terms and conditions of the GNU General Public
* License . See the file " COPYING " in the main directory of this archive
* for more details .
*
* Copyright ( C ) 2000 , 05 by Ralf Baechle ( ralf @ linux - mips . org )
* Copyright ( C ) 2000 by Silicon Graphics , Inc .
* Copyright ( C ) 2004 by Christoph Hellwig
*
* On SGI IP27 the ARC memory configuration data is completely bogus but
* alternate easier to use mechanisms are available .
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/export.h>
#include <linux/nodemask.h>
#include <linux/swap.h>
#include <linux/pfn.h>
#include <linux/highmem.h>
#include <asm /page.h>
#include <asm /pgalloc.h>
#include <asm /sections.h>
#include <asm /sgialib.h>
#include <asm /sn/arch.h>
#include <asm /sn/agent.h>
#include <asm /sn/klconfig.h>
#include "ip27-common.h"
#define SLOT_PFNSHIFT (SLOT_SHIFT - PAGE_SHIFT)
#define PFN_NASIDSHFT (NASID_SHFT - PAGE_SHIFT)
struct node_data *__node_data[MAX_NUMNODES];
EXPORT_SYMBOL(__node_data);
static u64 gen_region_mask(void )
{
int region_shift;
u64 region_mask;
nasid_t nasid;
region_shift = get_region_shift();
region_mask = 0 ;
for_each_online_node(nasid)
region_mask |= BIT_ULL(nasid >> region_shift);
return region_mask;
}
#define rou_rflag rou_flags
static int router_distance;
static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
{
klrou_t *router;
lboard_t *brd;
int port;
if (router_a->rou_rflag == 1 )
return ;
if (depth >= router_distance)
return ;
router_a->rou_rflag = 1 ;
for (port = 1 ; port <= MAX_ROUTER_PORTS; port++) {
if (router_a->rou_port[port].port_nasid == INVALID_NASID)
continue ;
brd = (lboard_t *)NODE_OFFSET_TO_K0(
router_a->rou_port[port].port_nasid,
router_a->rou_port[port].port_offset);
if (brd->brd_type == KLTYPE_ROUTER) {
router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0 ]);
if (router == router_b) {
if (depth < router_distance)
router_distance = depth;
}
else
router_recurse(router, router_b, depth + 1 );
}
}
router_a->rou_rflag = 0 ;
}
unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
EXPORT_SYMBOL(__node_distances);
static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
{
klrou_t *router, *router_a = NULL, *router_b = NULL;
lboard_t *brd, *dest_brd;
nasid_t nasid;
int port;
/* Figure out which routers nodes in question are connected to */
for_each_online_node(nasid) {
brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
KLTYPE_ROUTER);
if (!brd)
continue ;
do {
if (brd->brd_flags & DUPLICATE_BOARD)
continue ;
router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0 ]);
router->rou_rflag = 0 ;
for (port = 1 ; port <= MAX_ROUTER_PORTS; port++) {
if (router->rou_port[port].port_nasid == INVALID_NASID)
continue ;
dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
router->rou_port[port].port_nasid,
router->rou_port[port].port_offset);
if (dest_brd->brd_type == KLTYPE_IP27) {
if (dest_brd->brd_nasid == nasid_a)
router_a = router;
if (dest_brd->brd_nasid == nasid_b)
router_b = router;
}
}
} while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
}
if (nasid_a == nasid_b)
return LOCAL_DISTANCE;
if (router_a == router_b)
return LOCAL_DISTANCE + 1 ;
if (router_a == NULL) {
pr_info("node_distance: router_a NULL\n" );
return 255 ;
}
if (router_b == NULL) {
pr_info("node_distance: router_b NULL\n" );
return 255 ;
}
router_distance = 100 ;
router_recurse(router_a, router_b, 2 );
return LOCAL_DISTANCE + router_distance;
}
static void __init init_topology_matrix(void )
{
nasid_t row, col;
for (row = 0 ; row < MAX_NUMNODES; row++)
for (col = 0 ; col < MAX_NUMNODES; col++)
__node_distances[row][col] = -1 ;
for_each_online_node(row) {
for_each_online_node(col) {
__node_distances[row][col] =
compute_node_distance(row, col);
}
}
}
static void __init dump_topology(void )
{
nasid_t nasid;
lboard_t *brd, *dest_brd;
int port;
int router_num = 0 ;
klrou_t *router;
nasid_t row, col;
pr_info("************** Topology ********************\n" );
pr_info(" " );
for_each_online_node(col)
pr_cont("%02d " , col);
pr_cont("\n" );
for_each_online_node(row) {
pr_info("%02d " , row);
for_each_online_node(col)
pr_cont("%2d " , node_distance(row, col));
pr_cont("\n" );
}
for_each_online_node(nasid) {
brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
KLTYPE_ROUTER);
if (!brd)
continue ;
do {
if (brd->brd_flags & DUPLICATE_BOARD)
continue ;
pr_cont("Router %d:" , router_num);
router_num++;
router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0 ]);
for (port = 1 ; port <= MAX_ROUTER_PORTS; port++) {
if (router->rou_port[port].port_nasid == INVALID_NASID)
continue ;
dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
router->rou_port[port].port_nasid,
router->rou_port[port].port_offset);
if (dest_brd->brd_type == KLTYPE_IP27)
pr_cont(" %d" , dest_brd->brd_nasid);
if (dest_brd->brd_type == KLTYPE_ROUTER)
pr_cont(" r" );
}
pr_cont("\n" );
} while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
}
}
static unsigned long __init slot_getbasepfn(nasid_t nasid, int slot)
{
return ((unsigned long )nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
}
static unsigned long __init slot_psize_compute(nasid_t nasid, int slot)
{
lboard_t *brd;
klmembnk_t *banks;
unsigned long size;
/* Find the node board */
brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
if (!brd)
return 0 ;
/* Get the memory bank structure */
banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
if (!banks)
return 0 ;
/* Size in _Megabytes_ */
size = (unsigned long )banks->membnk_bnksz[slot/4 ];
/* hack for 128 dimm banks */
if (size <= 128 ) {
if (slot % 4 == 0 ) {
size <<= 20 ; /* size in bytes */
return size >> PAGE_SHIFT;
} else
return 0 ;
} else {
size /= 4 ;
size <<= 20 ;
return size >> PAGE_SHIFT;
}
}
static void __init mlreset(void )
{
u64 region_mask;
nasid_t nasid;
master_nasid = get_nasid();
/*
* Probe for all CPUs - this creates the cpumask and sets up the
* mapping tables . We need to do this as early as possible .
*/
#ifdef CONFIG_SMP
cpu_node_probe();
#endif
init_topology_matrix();
dump_topology();
region_mask = gen_region_mask();
setup_replication_mask();
/*
* Set all nodes ' calias sizes to 8 k
*/
for_each_online_node(nasid) {
/*
* Always have node 0 in the region mask , otherwise
* CALIAS accesses get exceptions since the hub
* thinks it is a node 0 address .
*/
REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1 ));
REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
#ifdef LATER
/*
* Set up all hubs to have a big window pointing at
* widget 0 . Memory mode , widget 0 , offset 0
*/
REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
(0 << IIO_ITTE_WIDGET_SHIFT)));
#endif
}
}
static void __init szmem(void )
{
unsigned long slot_psize, slot0sz = 0 , nodebytes; /* Hack to detect problem configs */
int slot;
nasid_t node;
for_each_online_node(node) {
nodebytes = 0 ;
for (slot = 0 ; slot < MAX_MEM_SLOTS; slot++) {
slot_psize = slot_psize_compute(node, slot);
if (slot == 0 )
slot0sz = slot_psize;
/*
* We need to refine the hack when we have replicated
* kernel text .
*/
nodebytes += (1 LL << SLOT_SHIFT);
if (!slot_psize)
continue ;
if ((nodebytes >> PAGE_SHIFT) * (sizeof (struct page)) >
(slot0sz << PAGE_SHIFT)) {
pr_info("Ignoring slot %d onwards on node %d\n" ,
slot, node);
slot = MAX_MEM_SLOTS;
continue ;
}
memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
PFN_PHYS(slot_psize), node,
MEMBLOCK_NONE);
}
}
}
static void __init node_mem_init(nasid_t node)
{
unsigned long slot_firstpfn = slot_getbasepfn(node, 0 );
unsigned long slot_freepfn = node_getfirstfree(node);
unsigned long start_pfn, end_pfn;
get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
/*
* Allocate the node data structures on the node first .
*/
__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
memset(__node_data[node], 0 , PAGE_SIZE);
node_data[node] = &__node_data[node]->pglist;
NODE_DATA(node)->node_start_pfn = start_pfn;
NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
cpumask_clear(&hub_data(node)->h_cpus);
slot_freepfn += PFN_UP(sizeof (struct pglist_data) +
sizeof (struct hub_data));
memblock_reserve(slot_firstpfn << PAGE_SHIFT,
((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
}
/*
* A node with nothing . We use it to avoid any special casing in
* cpumask_of_node
*/
static struct node_data null_node = {
.hub = {
.h_cpus = CPU_MASK_NONE
}
};
/*
* Currently , the intranode memory hole support assumes that each slot
* contains at least 32 MBytes of memory . We assume all bootmem data
* fits on the first slot .
*/
void __init prom_meminit(void )
{
nasid_t node;
mlreset();
szmem();
max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
for (node = 0 ; node < MAX_NUMNODES; node++) {
if (node_online(node)) {
node_mem_init(node);
continue ;
}
__node_data[node] = &null_node;
}
}
void __init paging_init(void )
{
unsigned long zones_size[MAX_NR_ZONES] = {0 , };
pagetable_init();
zones_size[ZONE_NORMAL] = max_low_pfn;
free_area_init(zones_size);
}
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(vorverarbeitet am 2026-09-27)
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