x86-32, NUMA: Update numaq to use new NUMA init protocol

[linux-2.6/x86.git] / arch / x86 / mm / numa_32.c

/*
 * Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation
 * August 2002: added remote node KVA remap - Martin J. Bligh 
 *
 * 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.
 */

#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/mmzone.h>
#include <linux/highmem.h>
#include <linux/initrd.h>
#include <linux/nodemask.h>
#include <linux/module.h>
#include <linux/kexec.h>
#include <linux/pfn.h>
#include <linux/swap.h>
#include <linux/acpi.h>

#include <asm/e820.h>
#include <asm/setup.h>
#include <asm/mmzone.h>
#include <asm/bios_ebda.h>
#include <asm/proto.h>

struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);

/*
 * numa interface - we expect the numa architecture specific code to have
 *                  populated the following initialisation.
 *
 * 1) node_online_map  - the map of all nodes configured (online) in the system
 * 2) node_start_pfn   - the starting page frame number for a node
 * 3) node_end_pfn     - the ending page fram number for a node
 */
unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;


#ifdef CONFIG_DISCONTIGMEM
/*
 * 4) physnode_map     - the mapping between a pfn and owning node
 * physnode_map keeps track of the physical memory layout of a generic
 * numa node on a 64Mb break (each element of the array will
 * represent 64Mb of memory and will be marked by the node id.  so,
 * if the first gig is on node 0, and the second gig is on node 1
 * physnode_map will contain:
 *
 *     physnode_map[0-15] = 0;
 *     physnode_map[16-31] = 1;
 *     physnode_map[32- ] = -1;
 */
s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
EXPORT_SYMBOL(physnode_map);

void memory_present(int nid, unsigned long start, unsigned long end)
{
        unsigned long pfn;

        printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
                        nid, start, end);
        printk(KERN_DEBUG "  Setting physnode_map array to node %d for pfns:\n", nid);
        printk(KERN_DEBUG "  ");
        for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
                physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
                printk(KERN_CONT "%lx ", pfn);
        }
        printk(KERN_CONT "\n");
}

unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
                                              unsigned long end_pfn)
{
        unsigned long nr_pages = end_pfn - start_pfn;

        if (!nr_pages)
                return 0;

        return (nr_pages + 1) * sizeof(struct page);
}
#endif

extern unsigned long find_max_low_pfn(void);
extern unsigned long highend_pfn, highstart_pfn;

#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)

static void *node_remap_start_vaddr[MAX_NUMNODES];
void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);

/*
 * FLAT - support for basic PC memory model with discontig enabled, essentially
 *        a single node with all available processors in it with a flat
 *        memory map.
 */
static int __init get_memcfg_numa_flat(void)
{
        printk(KERN_DEBUG "NUMA - single node, flat memory mode\n");

        node_start_pfn[0] = 0;
        node_end_pfn[0] = max_pfn;
        memblock_x86_register_active_regions(0, 0, max_pfn);

        /* Indicate there is one node available. */
        nodes_clear(node_online_map);
        node_set_online(0);
        return 1;
}

/*
 * Find the highest page frame number we have available for the node
 */
static void __init propagate_e820_map_node(int nid)
{
        if (node_end_pfn[nid] > max_pfn)
                node_end_pfn[nid] = max_pfn;
        /*
         * if a user has given mem=XXXX, then we need to make sure 
         * that the node _starts_ before that, too, not just ends
         */
        if (node_start_pfn[nid] > max_pfn)
                node_start_pfn[nid] = max_pfn;
        BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]);
}

/* 
 * Allocate memory for the pg_data_t for this node via a crude pre-bootmem
 * method.  For node zero take this from the bottom of memory, for
 * subsequent nodes place them at node_remap_start_vaddr which contains
 * node local data in physically node local memory.  See setup_memory()
 * for details.
 */
static void __init allocate_pgdat(int nid)
{
        char buf[16];

        NODE_DATA(nid) = alloc_remap(nid, ALIGN(sizeof(pg_data_t), PAGE_SIZE));
        if (!NODE_DATA(nid)) {
                unsigned long pgdat_phys;
                pgdat_phys = memblock_find_in_range(min_low_pfn<<PAGE_SHIFT,
                                 max_pfn_mapped<<PAGE_SHIFT,
                                 sizeof(pg_data_t),
                                 PAGE_SIZE);
                NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
                memset(buf, 0, sizeof(buf));
                sprintf(buf, "NODE_DATA %d",  nid);
                memblock_x86_reserve_range(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf);
        }
        printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n",
                nid, (unsigned long)NODE_DATA(nid));
}

/*
 * Remap memory allocator
 */
static unsigned long node_remap_start_pfn[MAX_NUMNODES];
static void *node_remap_end_vaddr[MAX_NUMNODES];
static void *node_remap_alloc_vaddr[MAX_NUMNODES];

/**
 * alloc_remap - Allocate remapped memory
 * @nid: NUMA node to allocate memory from
 * @size: The size of allocation
 *
 * Allocate @size bytes from the remap area of NUMA node @nid.  The
 * size of the remap area is predetermined by init_alloc_remap() and
 * only the callers considered there should call this function.  For
 * more info, please read the comment on top of init_alloc_remap().
 *
 * The caller must be ready to handle allocation failure from this
 * function and fall back to regular memory allocator in such cases.
 *
 * CONTEXT:
 * Single CPU early boot context.
 *
 * RETURNS:
 * Pointer to the allocated memory on success, %NULL on failure.
 */
void *alloc_remap(int nid, unsigned long size)
{
        void *allocation = node_remap_alloc_vaddr[nid];

        size = ALIGN(size, L1_CACHE_BYTES);

        if (!allocation || (allocation + size) > node_remap_end_vaddr[nid])
                return NULL;

        node_remap_alloc_vaddr[nid] += size;
        memset(allocation, 0, size);

        return allocation;
}

#ifdef CONFIG_HIBERNATION
/**
 * resume_map_numa_kva - add KVA mapping to the temporary page tables created
 *                       during resume from hibernation
 * @pgd_base - temporary resume page directory
 */
void resume_map_numa_kva(pgd_t *pgd_base)
{
        int node;

        for_each_online_node(node) {
                unsigned long start_va, start_pfn, nr_pages, pfn;

                start_va = (unsigned long)node_remap_start_vaddr[node];
                start_pfn = node_remap_start_pfn[node];
                nr_pages = (node_remap_end_vaddr[node] -
                            node_remap_start_vaddr[node]) >> PAGE_SHIFT;

                printk(KERN_DEBUG "%s: node %d\n", __func__, node);

                for (pfn = 0; pfn < nr_pages; pfn += PTRS_PER_PTE) {
                        unsigned long vaddr = start_va + (pfn << PAGE_SHIFT);
                        pgd_t *pgd = pgd_base + pgd_index(vaddr);
                        pud_t *pud = pud_offset(pgd, vaddr);
                        pmd_t *pmd = pmd_offset(pud, vaddr);

                        set_pmd(pmd, pfn_pmd(start_pfn + pfn,
                                                PAGE_KERNEL_LARGE_EXEC));

                        printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n",
                                __func__, vaddr, start_pfn + pfn);
                }
        }
}
#endif

/**
 * init_alloc_remap - Initialize remap allocator for a NUMA node
 * @nid: NUMA node to initizlie remap allocator for
 *
 * NUMA nodes may end up without any lowmem.  As allocating pgdat and
 * memmap on a different node with lowmem is inefficient, a special
 * remap allocator is implemented which can be used by alloc_remap().
 *
 * For each node, the amount of memory which will be necessary for
 * pgdat and memmap is calculated and two memory areas of the size are
 * allocated - one in the node and the other in lowmem; then, the area
 * in the node is remapped to the lowmem area.
 *
 * As pgdat and memmap must be allocated in lowmem anyway, this
 * doesn't waste lowmem address space; however, the actual lowmem
 * which gets remapped over is wasted.  The amount shouldn't be
 * problematic on machines this feature will be used.
 *
 * Initialization failure isn't fatal.  alloc_remap() is used
 * opportunistically and the callers will fall back to other memory
 * allocation mechanisms on failure.
 */
static __init void init_alloc_remap(int nid)
{
        unsigned long size, pfn;
        u64 node_pa, remap_pa;
        void *remap_va;

        /*
         * The acpi/srat node info can show hot-add memroy zones where
         * memory could be added but not currently present.
         */
        printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n",
               nid, node_start_pfn[nid], node_end_pfn[nid]);
        if (node_start_pfn[nid] > max_pfn)
                return;
        if (!node_end_pfn[nid])
                return;
        if (node_end_pfn[nid] > max_pfn)
                node_end_pfn[nid] = max_pfn;

        /* calculate the necessary space aligned to large page size */
        size = node_memmap_size_bytes(nid, node_start_pfn[nid],
                                      min(node_end_pfn[nid], max_pfn));
        size += ALIGN(sizeof(pg_data_t), PAGE_SIZE);
        size = ALIGN(size, LARGE_PAGE_BYTES);

        /* allocate node memory and the lowmem remap area */
        node_pa = memblock_find_in_range(node_start_pfn[nid] << PAGE_SHIFT,
                                         (u64)node_end_pfn[nid] << PAGE_SHIFT,
                                         size, LARGE_PAGE_BYTES);
        if (node_pa == MEMBLOCK_ERROR) {
                pr_warning("remap_alloc: failed to allocate %lu bytes for node %d\n",
                           size, nid);
                return;
        }
        memblock_x86_reserve_range(node_pa, node_pa + size, "KVA RAM");

        remap_pa = memblock_find_in_range(min_low_pfn << PAGE_SHIFT,
                                          max_low_pfn << PAGE_SHIFT,
                                          size, LARGE_PAGE_BYTES);
        if (remap_pa == MEMBLOCK_ERROR) {
                pr_warning("remap_alloc: failed to allocate %lu bytes remap area for node %d\n",
                           size, nid);
                memblock_x86_free_range(node_pa, node_pa + size);
                return;
        }
        memblock_x86_reserve_range(remap_pa, remap_pa + size, "KVA PG");
        remap_va = phys_to_virt(remap_pa);

        /* perform actual remap */
        for (pfn = 0; pfn < size >> PAGE_SHIFT; pfn += PTRS_PER_PTE)
                set_pmd_pfn((unsigned long)remap_va + (pfn << PAGE_SHIFT),
                            (node_pa >> PAGE_SHIFT) + pfn,
                            PAGE_KERNEL_LARGE);

        /* initialize remap allocator parameters */
        node_remap_start_pfn[nid] = node_pa >> PAGE_SHIFT;
        node_remap_start_vaddr[nid] = remap_va;
        node_remap_end_vaddr[nid] = remap_va + size;
        node_remap_alloc_vaddr[nid] = remap_va;

        printk(KERN_DEBUG "remap_alloc: node %d [%08llx-%08llx) -> [%p-%p)\n",
               nid, node_pa, node_pa + size, remap_va, remap_va + size);
}

static int get_memcfg_numaq(void)
{
#ifdef CONFIG_X86_NUMAQ
        int nid;

        if (numa_off)
                return 0;

        if (numaq_numa_init() < 0) {
                nodes_clear(numa_nodes_parsed);
                remove_all_active_ranges();
                return 0;
        }

        for_each_node_mask(nid, numa_nodes_parsed)
                node_set_online(nid);
        sort_node_map();
        return 1;
#else
        return 0;
#endif
}

static int get_memcfg_from_srat(void)
{
#ifdef CONFIG_ACPI_NUMA
        int nid;

        if (numa_off)
                return 0;

        if (x86_acpi_numa_init() < 0) {
                nodes_clear(numa_nodes_parsed);
                remove_all_active_ranges();
                return 0;
        }

        for_each_node_mask(nid, numa_nodes_parsed)
                node_set_online(nid);
        sort_node_map();
        return 1;
#else
        return 0;
#endif
}

static void get_memcfg_numa(void)
{
        if (get_memcfg_numaq())
                return;
        if (get_memcfg_from_srat())
                return;
        get_memcfg_numa_flat();
}

void __init initmem_init(void)
{
        int nid;

        get_memcfg_numa();
        numa_init_array();

        for_each_online_node(nid)
                init_alloc_remap(nid);

#ifdef CONFIG_HIGHMEM
        highstart_pfn = highend_pfn = max_pfn;
        if (max_pfn > max_low_pfn)
                highstart_pfn = max_low_pfn;
        printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
               pages_to_mb(highend_pfn - highstart_pfn));
        num_physpages = highend_pfn;
        high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
        num_physpages = max_low_pfn;
        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
        printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
                        pages_to_mb(max_low_pfn));
        printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
                        max_low_pfn, highstart_pfn);

        printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n",
                        (ulong) pfn_to_kaddr(max_low_pfn));
        for_each_online_node(nid)
                allocate_pgdat(nid);

        printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
                        (ulong) pfn_to_kaddr(highstart_pfn));
        for_each_online_node(nid)
                propagate_e820_map_node(nid);

        for_each_online_node(nid) {
                memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
                NODE_DATA(nid)->node_id = nid;
        }

        setup_bootmem_allocator();
}

#ifdef CONFIG_MEMORY_HOTPLUG
static int paddr_to_nid(u64 addr)
{
        int nid;
        unsigned long pfn = PFN_DOWN(addr);

        for_each_node(nid)
                if (node_start_pfn[nid] <= pfn &&
                    pfn < node_end_pfn[nid])
                        return nid;

        return -1;
}

/*
 * This function is used to ask node id BEFORE memmap and mem_section's
 * initialization (pfn_to_nid() can't be used yet).
 * If _PXM is not defined on ACPI's DSDT, node id must be found by this.
 */
int memory_add_physaddr_to_nid(u64 addr)
{
        int nid = paddr_to_nid(addr);
        return (nid >= 0) ? nid : 0;
}

EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif

/* temporary shim, will go away soon */
int __init numa_add_memblk(int nid, u64 start, u64 end)
{
        unsigned long start_pfn = start >> PAGE_SHIFT;
        unsigned long end_pfn = end >> PAGE_SHIFT;

        printk(KERN_DEBUG "nid %d start_pfn %08lx end_pfn %08lx\n",
               nid, start_pfn, end_pfn);

        if (start >= (u64)max_pfn << PAGE_SHIFT) {
                printk(KERN_INFO "Ignoring SRAT pfns: %08lx - %08lx\n",
                       start_pfn, end_pfn);
                return 0;
        }

        node_set_online(nid);
        memblock_x86_register_active_regions(nid, start_pfn,
                                             min(end_pfn, max_pfn));

        if (!node_has_online_mem(nid)) {
                node_start_pfn[nid] = start_pfn;
                node_end_pfn[nid] = end_pfn;
        } else {
                node_start_pfn[nid] = min(node_start_pfn[nid], start_pfn);
                node_end_pfn[nid] = max(node_end_pfn[nid], end_pfn);
        }
        return 0;
}

/* temporary shim, will go away soon */
void __init numa_set_distance(int from, int to, int distance)
{
        /* nada */
}