ip27-memory.c

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/*
 * 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 ([email protected])
 * Copyright (C) 2000 by Silicon Graphics, Inc.
 * Copyright (C) 2004 by Christoph Hellwig
 *
 * On SGI IP27 the ARC memory configuration data is completly 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/module.h>
#include <linux/nodemask.h>
#include <linux/swap.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>
#include <linux/highmem.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>

#include <asm/sn/arch.h>
#include <asm/sn/hub.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/sn_private.h>


#define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
#define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)

struct node_data *__node_data[MAX_COMPACT_NODES];

EXPORT_SYMBOL(__node_data);

static int fine_mode;

static int is_fine_dirmode(void)
{
    return (((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK)
            >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE);
}

static hubreg_t get_region(cnodeid_t cnode)
{
    if (fine_mode)
        return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
    else
        return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
}

static hubreg_t region_mask;

static void gen_region_mask(hubreg_t *region_mask)
{
    cnodeid_t cnode;

    (*region_mask) = 0;
    for_each_online_node(cnode) {
        (*region_mask) |= 1ULL << get_region(cnode);
    }
}

#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_COMPACT_NODES][MAX_COMPACT_NODES];

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;
    cnodeid_t cnode;
    nasid_t nasid;
    int port;

    /* Figure out which routers nodes in question are connected to */
    for_each_online_node(cnode) {
        nasid = COMPACT_TO_NASID_NODEID(cnode);

        if (nasid == -1) continue;

        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 (router_a == NULL) {
        printk("node_distance: router_a NULL\n");
        return -1;
    }
    if (router_b == NULL) {
        printk("node_distance: router_b NULL\n");
        return -1;
    }

    if (nasid_a == nasid_b)
        return 0;

    if (router_a == router_b)
        return 1;

    router_distance = 100;
    router_recurse(router_a, router_b, 2);

    return router_distance;
}

static void __init init_topology_matrix(void)
{
    nasid_t nasid, nasid2;
    cnodeid_t row, col;

    for (row = 0; row < MAX_COMPACT_NODES; row++)
        for (col = 0; col < MAX_COMPACT_NODES; col++)
            __node_distances[row][col] = -1;

    for_each_online_node(row) {
        nasid = COMPACT_TO_NASID_NODEID(row);
        for_each_online_node(col) {
            nasid2 = COMPACT_TO_NASID_NODEID(col);
            __node_distances[row][col] =
                compute_node_distance(nasid, nasid2);
        }
    }
}

static void __init dump_topology(void)
{
    nasid_t nasid;
    cnodeid_t cnode;
    lboard_t *brd, *dest_brd;
    int port;
    int router_num = 0;
    klrou_t *router;
    cnodeid_t row, col;

    printk("************** Topology ********************\n");

    printk("    ");
    for_each_online_node(col)
        printk("%02d ", col);
    printk("\n");
    for_each_online_node(row) {
        printk("%02d  ", row);
        for_each_online_node(col)
            printk("%2d ", node_distance(row, col));
        printk("\n");
    }

    for_each_online_node(cnode) {
        nasid = COMPACT_TO_NASID_NODEID(cnode);

        if (nasid == -1) continue;

        brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
                    KLTYPE_ROUTER);

        if (!brd)
            continue;

        do {
            if (brd->brd_flags & DUPLICATE_BOARD)
                continue;
            printk("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)
                    printk(" %d", dest_brd->brd_nasid);
                if (dest_brd->brd_type == KLTYPE_ROUTER)
                    printk(" r");
            }
            printk("\n");

        } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
    }
}

static pfn_t __init slot_getbasepfn(cnodeid_t cnode, int slot)
{
    nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);

    return ((pfn_t)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
}

static pfn_t __init slot_psize_compute(cnodeid_t node, int slot)
{
    nasid_t nasid;
    lboard_t *brd;
    klmembnk_t *banks;
    unsigned long size;

    nasid = COMPACT_TO_NASID_NODEID(node);
    /* 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)
{
    int i;

    master_nasid = get_nasid();
    fine_mode = is_fine_dirmode();

    /*
     * 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();

    gen_region_mask(&region_mask);

    setup_replication_mask();

    /*
     * Set all nodes' calias sizes to 8k
     */
    for_each_online_node(i) {
        nasid_t nasid;

        nasid = COMPACT_TO_NASID_NODEID(i);

        /*
         * 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));
#ifdef CONFIG_REPLICATE_EXHANDLERS
        REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
#else
        REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
#endif

#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)
{
    pfn_t slot_psize, slot0sz = 0, nodebytes;   /* Hack to detect problem configs */
    int slot;
    cnodeid_t node;

    num_physpages = 0;

    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 += (1LL << SLOT_SHIFT);

            if (!slot_psize)
                continue;

            if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
                        (slot0sz << PAGE_SHIFT)) {
                printk("Ignoring slot %d onwards on node %d\n",
                                slot, node);
                slot = MAX_MEM_SLOTS;
                continue;
            }
            num_physpages += slot_psize;
            memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
                      PFN_PHYS(slot_psize), node);
        }
    }
}

static void __init node_mem_init(cnodeid_t node)
{
    pfn_t slot_firstpfn = slot_getbasepfn(node, 0);
    pfn_t slot_freepfn = node_getfirstfree(node);
    unsigned long bootmap_size;
    pfn_t 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)->bdata = &bootmem_node_data[node];
    NODE_DATA(node)->node_start_pfn = start_pfn;
    NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;

    cpus_clear(hub_data(node)->h_cpus);

    slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
                   sizeof(struct hub_data));

    bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
                    start_pfn, end_pfn);
    free_bootmem_with_active_regions(node, end_pfn);
    reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
        ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size,
        BOOTMEM_DEFAULT);
    sparse_memory_present_with_active_regions(node);
}

/*
 * 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)
{
    cnodeid_t node;

    mlreset();
    szmem();

    for (node = 0; node < MAX_COMPACT_NODES; node++) {
        if (node_online(node)) {
            node_mem_init(node);
            continue;
        }
        __node_data[node] = &null_node;
    }
}

void __init prom_free_prom_memory(void)
{
    /* We got nothing to free here ...  */
}

extern unsigned long setup_zero_pages(void);

void __init paging_init(void)
{
    unsigned long zones_size[MAX_NR_ZONES] = {0, };
    unsigned node;

    pagetable_init();

    for_each_online_node(node) {
        pfn_t start_pfn, end_pfn;

        get_pfn_range_for_nid(node, &start_pfn, &end_pfn);

        if (end_pfn > max_low_pfn)
            max_low_pfn = end_pfn;
    }
    zones_size[ZONE_NORMAL] = max_low_pfn;
    free_area_init_nodes(zones_size);
}

void __init mem_init(void)
{
    unsigned long codesize, datasize, initsize, tmp;
    unsigned node;

    high_memory = (void *) __va(num_physpages << PAGE_SHIFT);

    for_each_online_node(node) {
        /*
         * This will free up the bootmem, ie, slot 0 memory.
         */
        totalram_pages += free_all_bootmem_node(NODE_DATA(node));
    }

    totalram_pages -= setup_zero_pages();   /* This comes from node 0 */

    codesize =  (unsigned long) &_etext - (unsigned long) &_text;
    datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
    initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;

    tmp = nr_free_pages();
    printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
           "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
           tmp << (PAGE_SHIFT-10),
           num_physpages << (PAGE_SHIFT-10),
           codesize >> 10,
           (num_physpages - tmp) << (PAGE_SHIFT-10),
           datasize >> 10,
           initsize >> 10,
           totalhigh_pages << (PAGE_SHIFT-10));
}