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!

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)));
+}