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-rw-r--r--arch/mips/sgi-ip27/ip27-memory.c434
1 files changed, 434 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 000000000..f79c48393
--- /dev/null
+++ b/arch/mips/sgi-ip27/ip27-memory.c
@@ -0,0 +1,434 @@
+/*
+ * 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/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 8k
+ */
+ 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 += (1LL << 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_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;
+ }
+}
+
+extern void setup_zero_pages(void);
+
+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);
+}
+
+void __init mem_init(void)
+{
+ high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
+ memblock_free_all();
+ setup_zero_pages(); /* This comes from node 0 */
+}
+
+pg_data_t * __init arch_alloc_nodedata(int nid)
+{
+ return memblock_alloc(sizeof(pg_data_t), SMP_CACHE_BYTES);
+}
+
+void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
+{
+ __node_data[nid] = (struct node_data *)pgdat;
+}