1 files changed, 586 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
new file mode 100644
index 000000000000..0a44a98d7adc
--- /dev/null
+++ b/arch/mips/sgi-ip27/ip27-memory.c
@@ -0,0 +1,586 @@
+/*
+ * 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 completly bogus but
+ * alternate easier to use mechanisms are available.
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/kernel.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 <asm/page.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 PFN_UP(x)               (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
+
+#define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
+#define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)
+
+#define SLOT_IGNORED            0xffff
+
+static short __initdata slot_lastfilled_cache[MAX_COMPACT_NODES];
+static unsigned short __initdata slot_psize_cache[MAX_COMPACT_NODES][MAX_MEM_SLOTS];
+static struct bootmem_data __initdata plat_node_bdata[MAX_COMPACT_NODES];
+
+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);
+}
+
+/*
+ * Return the number of pages of memory provided by the given slot
+ * on the specified node.
+ */
+static pfn_t __init slot_getsize(cnodeid_t node, int slot)
+{
+        return (pfn_t) slot_psize_cache[node][slot];
+}
+
+/*
+ * Return highest slot filled
+ */
+static int __init node_getlastslot(cnodeid_t node)
+{
+        return (int) slot_lastfilled_cache[node];
+}
+
+/*
+ * Return the pfn of the last free page of memory on a node.
+ */
+static pfn_t __init node_getmaxclick(cnodeid_t node)
+{
+        pfn_t   slot_psize;
+        int     slot;
+
+        /*
+         * Start at the top slot. When we find a slot with memory in it,
+         * that's the winner.
+         */
+        for (slot = (MAX_MEM_SLOTS - 1); slot >= 0; slot--) {
+                if ((slot_psize = slot_getsize(node, slot))) {
+                        if (slot_psize == SLOT_IGNORED)
+                                continue;
+                        /* Return the basepfn + the slot size, minus 1. */
+                        return slot_getbasepfn(node, slot) + slot_psize - 1;
+                }
+        }
+
+        /*
+         * If there's no memory on the node, return 0. This is likely
+         * to cause problems.
+         */
+        return 0;
+}
+
+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, ignore;
+        cnodeid_t node;
+
+        num_physpages = 0;
+
+        for_each_online_node(node) {
+                ignore = 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 ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
+                                                (slot0sz << PAGE_SHIFT))
+                                ignore = 1;
+                        if (ignore && slot_psize) {
+                                printk("Ignoring slot %d onwards on node %d\n",
+                                                                slot, node);
+                                slot_psize_cache[node][slot] = SLOT_IGNORED;
+                                slot = MAX_MEM_SLOTS;
+                                continue;
+                        }
+                        num_physpages += slot_psize;
+                        slot_psize_cache[node][slot] =
+                                        (unsigned short) slot_psize;
+                        if (slot_psize)
+                                slot_lastfilled_cache[node] = slot;
+                }
+        }
+}
+
+static void __init node_mem_init(cnodeid_t node)
+{
+        pfn_t slot_firstpfn = slot_getbasepfn(node, 0);
+        pfn_t slot_lastpfn = slot_firstpfn + slot_getsize(node, 0);
+        pfn_t slot_freepfn = node_getfirstfree(node);
+        struct pglist_data *pd;
+        unsigned long bootmap_size;
+
+        /*
+         * Allocate the node data structures on the node first.
+         */
+        __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
+
+        pd = NODE_DATA(node);
+        pd->bdata = &plat_node_bdata[node];
+
+        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,
+                                        slot_firstpfn, slot_lastpfn);
+        free_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
+                        (slot_lastpfn - slot_firstpfn) << PAGE_SHIFT);
+        reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
+                ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size);
+}
+
+/*
+ * A node with nothing.  We use it to avoid any special casing in
+ * node_to_cpumask
+ */
+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;
+        }
+}
+
+unsigned long __init prom_free_prom_memory(void)
+{
+        /* We got nothing to free here ...  */
+        return 0;
+}
+
+extern void pagetable_init(void);
+extern unsigned long setup_zero_pages(void);
+
+void __init paging_init(void)
+{
+        unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+        unsigned node;
+
+        pagetable_init();
+
+        for_each_online_node(node) {
+                pfn_t start_pfn = slot_getbasepfn(node, 0);
+                pfn_t end_pfn = node_getmaxclick(node) + 1;
+
+                zones_size[ZONE_DMA] = end_pfn - start_pfn;
+                free_area_init_node(node, NODE_DATA(node),
+                                zones_size, start_pfn, NULL);
+
+                if (end_pfn > max_low_pfn)
+                        max_low_pfn = end_pfn;
+        }
+}
+
+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) {
+                unsigned slot, numslots;
+                struct page *end, *p;
+        
+                /*
+                 * This will free up the bootmem, ie, slot 0 memory.
+                 */
+                totalram_pages += free_all_bootmem_node(NODE_DATA(node));
+
+                /*
+                 * We need to manually do the other slots.
+                 */
+                numslots = node_getlastslot(node);
+                for (slot = 1; slot <= numslots; slot++) {
+                        p = NODE_DATA(node)->node_mem_map +
+                                (slot_getbasepfn(node, slot) -
+                                 slot_getbasepfn(node, 0));
+
+                        /*
+                         * Free valid memory in current slot.
+                         */
+                        for (end = p + slot_getsize(node, slot); p < end; p++) {
+                                /* if (!page_is_ram(pgnr)) continue; */
+                                /* commented out until page_is_ram works */
+                                ClearPageReserved(p);
+                                set_page_count(p, 1);
+                                __free_page(p);
+                                totalram_pages++;
+                        }
+                }
+        }
+
+        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,
+               (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
+}