Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
new file mode 100644
index 0000000..0a44a98
--- /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(®ion_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)));
+}