1 files changed, 279 insertions, 0 deletions

diff --git a/arch/x86/mm/srat_32.c b/arch/x86/mm/srat_32.c
new file mode 100644
index 000000000000..1eb2973a301c
--- /dev/null
+++ b/arch/x86/mm/srat_32.c
@@ -0,0 +1,279 @@
+/*
+ * Some of the code in this file has been gleaned from the 64 bit 
+ * discontigmem support code base.
+ *
+ * Copyright (C) 2002, IBM Corp.
+ *
+ * All rights reserved.          
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to Pat Gaughen <gone@us.ibm.com>
+ */
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/mmzone.h>
+#include <linux/acpi.h>
+#include <linux/nodemask.h>
+#include <asm/srat.h>
+#include <asm/topology.h>
+#include <asm/smp.h>
+#include <asm/e820.h>
+
+/*
+ * proximity macros and definitions
+ */
+#define NODE_ARRAY_INDEX(x)     ((x) / 8)       /* 8 bits/char */
+#define NODE_ARRAY_OFFSET(x)    ((x) % 8)       /* 8 bits/char */
+#define BMAP_SET(bmap, bit)     ((bmap)[NODE_ARRAY_INDEX(bit)] |= 1 << NODE_ARRAY_OFFSET(bit))
+#define BMAP_TEST(bmap, bit)    ((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
+/* bitmap length; _PXM is at most 255 */
+#define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8) 
+static u8 __initdata pxm_bitmap[PXM_BITMAP_LEN];        /* bitmap of proximity domains */
+
+#define MAX_CHUNKS_PER_NODE     3
+#define MAXCHUNKS               (MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
+struct node_memory_chunk_s {
+        unsigned long   start_pfn;
+        unsigned long   end_pfn;
+        u8      pxm;            // proximity domain of node
+        u8      nid;            // which cnode contains this chunk?
+        u8      bank;           // which mem bank on this node
+};
+static struct node_memory_chunk_s __initdata node_memory_chunk[MAXCHUNKS];
+
+static int __initdata num_memory_chunks; /* total number of memory chunks */
+static u8 __initdata apicid_to_pxm[MAX_APICID];
+
+int numa_off __initdata;
+int acpi_numa __initdata;
+
+static __init void bad_srat(void)
+{
+        printk(KERN_ERR "SRAT: SRAT not used.\n");
+        acpi_numa = -1;
+        num_memory_chunks = 0;
+}
+
+static __init inline int srat_disabled(void)
+{
+        return numa_off || acpi_numa < 0;
+}
+
+/* Identify CPU proximity domains */
+void __init
+acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *cpu_affinity)
+{
+        if (srat_disabled())
+                return;
+        if (cpu_affinity->header.length !=
+             sizeof(struct acpi_srat_cpu_affinity)) {
+                bad_srat();
+                return;
+        }
+
+        if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
+                return;         /* empty entry */
+
+        /* mark this node as "seen" in node bitmap */
+        BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);
+
+        apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;
+
+        printk(KERN_DEBUG "CPU %02x in proximity domain %02x\n",
+                cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
+}
+
+/*
+ * Identify memory proximity domains and hot-remove capabilities.
+ * Fill node memory chunk list structure.
+ */
+void __init
+acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *memory_affinity)
+{
+        unsigned long long paddr, size;
+        unsigned long start_pfn, end_pfn;
+        u8 pxm;
+        struct node_memory_chunk_s *p, *q, *pend;
+
+        if (srat_disabled())
+                return;
+        if (memory_affinity->header.length !=
+             sizeof(struct acpi_srat_mem_affinity)) {
+                bad_srat();
+                return;
+        }
+
+        if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
+                return;         /* empty entry */
+
+        pxm = memory_affinity->proximity_domain & 0xff;
+
+        /* mark this node as "seen" in node bitmap */
+        BMAP_SET(pxm_bitmap, pxm);
+
+        /* calculate info for memory chunk structure */
+        paddr = memory_affinity->base_address;
+        size = memory_affinity->length;
+
+        start_pfn = paddr >> PAGE_SHIFT;
+        end_pfn = (paddr + size) >> PAGE_SHIFT;
+
+
+        if (num_memory_chunks >= MAXCHUNKS) {
+                printk(KERN_WARNING "Too many mem chunks in SRAT."
+                        " Ignoring %lld MBytes at %llx\n",
+                        size/(1024*1024), paddr);
+                return;
+        }
+
+        /* Insertion sort based on base address */
+        pend = &node_memory_chunk[num_memory_chunks];
+        for (p = &node_memory_chunk[0]; p < pend; p++) {
+                if (start_pfn < p->start_pfn)
+                        break;
+        }
+        if (p < pend) {
+                for (q = pend; q >= p; q--)
+                        *(q + 1) = *q;
+        }
+        p->start_pfn = start_pfn;
+        p->end_pfn = end_pfn;
+        p->pxm = pxm;
+
+        num_memory_chunks++;
+
+        printk(KERN_DEBUG "Memory range %08lx to %08lx"
+                          " in proximity domain %02x %s\n",
+                start_pfn, end_pfn,
+                pxm,
+                ((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
+                 "enabled and removable" : "enabled" ) );
+}
+
+/* Callback for SLIT parsing */
+void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
+{
+}
+
+void acpi_numa_arch_fixup(void)
+{
+}
+/*
+ * The SRAT table always lists ascending addresses, so can always
+ * assume that the first "start" address that you see is the real
+ * start of the node, and that the current "end" address is after
+ * the previous one.
+ */
+static __init void node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
+{
+        /*
+         * Only add present memory as told by the e820.
+         * There is no guarantee from the SRAT that the memory it
+         * enumerates is present at boot time because it represents
+         * *possible* memory hotplug areas the same as normal RAM.
+         */
+        if (memory_chunk->start_pfn >= max_pfn) {
+                printk(KERN_INFO "Ignoring SRAT pfns: %08lx - %08lx\n",
+                        memory_chunk->start_pfn, memory_chunk->end_pfn);
+                return;
+        }
+        if (memory_chunk->nid != nid)
+                return;
+
+        if (!node_has_online_mem(nid))
+                node_start_pfn[nid] = memory_chunk->start_pfn;
+
+        if (node_start_pfn[nid] > memory_chunk->start_pfn)
+                node_start_pfn[nid] = memory_chunk->start_pfn;
+
+        if (node_end_pfn[nid] < memory_chunk->end_pfn)
+                node_end_pfn[nid] = memory_chunk->end_pfn;
+}
+
+int __init get_memcfg_from_srat(void)
+{
+        int i, j, nid;
+
+
+        if (srat_disabled())
+                goto out_fail;
+
+        if (num_memory_chunks == 0) {
+                printk(KERN_WARNING
+                         "could not finy any ACPI SRAT memory areas.\n");
+                goto out_fail;
+        }
+
+        /* Calculate total number of nodes in system from PXM bitmap and create
+         * a set of sequential node IDs starting at zero.  (ACPI doesn't seem
+         * to specify the range of _PXM values.)
+         */
+        /*
+         * MCD - we no longer HAVE to number nodes sequentially.  PXM domain
+         * numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
+         * 32, so we will continue numbering them in this manner until MAX_NUMNODES
+         * approaches MAX_PXM_DOMAINS for i386.
+         */
+        nodes_clear(node_online_map);
+        for (i = 0; i < MAX_PXM_DOMAINS; i++) {
+                if (BMAP_TEST(pxm_bitmap, i)) {
+                        int nid = acpi_map_pxm_to_node(i);
+                        node_set_online(nid);
+                }
+        }
+        BUG_ON(num_online_nodes() == 0);
+
+        /* set cnode id in memory chunk structure */
+        for (i = 0; i < num_memory_chunks; i++)
+                node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);
+
+        printk(KERN_DEBUG "pxm bitmap: ");
+        for (i = 0; i < sizeof(pxm_bitmap); i++) {
+                printk(KERN_CONT "%02x ", pxm_bitmap[i]);
+        }
+        printk(KERN_CONT "\n");
+        printk(KERN_DEBUG "Number of logical nodes in system = %d\n",
+                         num_online_nodes());
+        printk(KERN_DEBUG "Number of memory chunks in system = %d\n",
+                         num_memory_chunks);
+
+        for (i = 0; i < MAX_APICID; i++)
+                apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);
+
+        for (j = 0; j < num_memory_chunks; j++){
+                struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
+                printk(KERN_DEBUG
+                        "chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
+                       j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
+                node_read_chunk(chunk->nid, chunk);
+                e820_register_active_regions(chunk->nid, chunk->start_pfn,
+                                             min(chunk->end_pfn, max_pfn));
+        }
+
+        for_each_online_node(nid) {
+                unsigned long start = node_start_pfn[nid];
+                unsigned long end = min(node_end_pfn[nid], max_pfn);
+
+                memory_present(nid, start, end);
+                node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
+        }
+        return 1;
+out_fail:
+        printk(KERN_ERR "failed to get NUMA memory information from SRAT"
+                        " table\n");
+        return 0;
+}