1 files changed, 395 insertions, 0 deletions

diff --git a/arch/alpha/mm/numa.c b/arch/alpha/mm/numa.c
new file mode 100644
index 000000000000..ba81c4422aaf
--- /dev/null
+++ b/arch/alpha/mm/numa.c
@@ -0,0 +1,395 @@
+/*
+ *  linux/arch/alpha/mm/numa.c
+ *
+ *  DISCONTIGMEM NUMA alpha support.
+ *
+ *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/swap.h>
+#include <linux/initrd.h>
+
+#include <asm/hwrpb.h>
+#include <asm/pgalloc.h>
+
+pg_data_t node_data[MAX_NUMNODES];
+bootmem_data_t node_bdata[MAX_NUMNODES];
+
+#undef DEBUG_DISCONTIG
+#ifdef DEBUG_DISCONTIG
+#define DBGDCONT(args...) printk(args)
+#else
+#define DBGDCONT(args...)
+#endif
+
+#define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
+#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
+#define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
+#define for_each_mem_cluster(memdesc, cluster, i)               \
+        for ((cluster) = (memdesc)->cluster, (i) = 0;           \
+             (i) < (memdesc)->numclusters; (i)++, (cluster)++)
+
+static void __init show_mem_layout(void)
+{
+        struct memclust_struct * cluster;
+        struct memdesc_struct * memdesc;
+        int i;
+
+        /* Find free clusters, and init and free the bootmem accordingly.  */
+        memdesc = (struct memdesc_struct *)
+          (hwrpb->mddt_offset + (unsigned long) hwrpb);
+
+        printk("Raw memory layout:\n");
+        for_each_mem_cluster(memdesc, cluster, i) {
+                printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
+                       i, cluster->usage, cluster->start_pfn,
+                       cluster->start_pfn + cluster->numpages);
+        }
+}
+
+static void __init
+setup_memory_node(int nid, void *kernel_end)
+{
+        extern unsigned long mem_size_limit;
+        struct memclust_struct * cluster;
+        struct memdesc_struct * memdesc;
+        unsigned long start_kernel_pfn, end_kernel_pfn;
+        unsigned long bootmap_size, bootmap_pages, bootmap_start;
+        unsigned long start, end;
+        unsigned long node_pfn_start, node_pfn_end;
+        unsigned long node_min_pfn, node_max_pfn;
+        int i;
+        unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
+        int show_init = 0;
+
+        /* Find the bounds of current node */
+        node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
+        node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
+        
+        /* Find free clusters, and init and free the bootmem accordingly.  */
+        memdesc = (struct memdesc_struct *)
+          (hwrpb->mddt_offset + (unsigned long) hwrpb);
+
+        /* find the bounds of this node (node_min_pfn/node_max_pfn) */
+        node_min_pfn = ~0UL;
+        node_max_pfn = 0UL;
+        for_each_mem_cluster(memdesc, cluster, i) {
+                /* Bit 0 is console/PALcode reserved.  Bit 1 is
+                   non-volatile memory -- we might want to mark
+                   this for later.  */
+                if (cluster->usage & 3)
+                        continue;
+
+                start = cluster->start_pfn;
+                end = start + cluster->numpages;
+
+                if (start >= node_pfn_end || end <= node_pfn_start)
+                        continue;
+
+                if (!show_init) {
+                        show_init = 1;
+                        printk("Initializing bootmem allocator on Node ID %d\n", nid);
+                }
+                printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
+                       i, cluster->usage, cluster->start_pfn,
+                       cluster->start_pfn + cluster->numpages);
+
+                if (start < node_pfn_start)
+                        start = node_pfn_start;
+                if (end > node_pfn_end)
+                        end = node_pfn_end;
+
+                if (start < node_min_pfn)
+                        node_min_pfn = start;
+                if (end > node_max_pfn)
+                        node_max_pfn = end;
+        }
+
+        if (mem_size_limit && node_max_pfn > mem_size_limit) {
+                static int msg_shown = 0;
+                if (!msg_shown) {
+                        msg_shown = 1;
+                        printk("setup: forcing memory size to %ldK (from %ldK).\n",
+                               mem_size_limit << (PAGE_SHIFT - 10),
+                               node_max_pfn    << (PAGE_SHIFT - 10));
+                }
+                node_max_pfn = mem_size_limit;
+        }
+
+        if (node_min_pfn >= node_max_pfn)
+                return;
+
+        /* Update global {min,max}_low_pfn from node information. */
+        if (node_min_pfn < min_low_pfn)
+                min_low_pfn = node_min_pfn;
+        if (node_max_pfn > max_low_pfn)
+                max_pfn = max_low_pfn = node_max_pfn;
+
+        num_physpages += node_max_pfn - node_min_pfn;
+
+#if 0 /* we'll try this one again in a little while */
+        /* Cute trick to make sure our local node data is on local memory */
+        node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
+#endif
+        /* Quasi-mark the pg_data_t as in-use */
+        node_min_pfn += node_datasz;
+        if (node_min_pfn >= node_max_pfn) {
+                printk(" not enough mem to reserve NODE_DATA");
+                return;
+        }
+        NODE_DATA(nid)->bdata = &node_bdata[nid];
+
+        printk(" Detected node memory:   start %8lu, end %8lu\n",
+               node_min_pfn, node_max_pfn);
+
+        DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
+        DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
+
+        /* Find the bounds of kernel memory.  */
+        start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
+        end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
+        bootmap_start = -1;
+
+        if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
+                panic("kernel loaded out of ram");
+
+        /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
+           Note that we round this down, not up - node memory
+           has much larger alignment than 8Mb, so it's safe. */
+        node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
+
+        /* We need to know how many physically contiguous pages
+           we'll need for the bootmap.  */
+        bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
+
+        /* Now find a good region where to allocate the bootmap.  */
+        for_each_mem_cluster(memdesc, cluster, i) {
+                if (cluster->usage & 3)
+                        continue;
+
+                start = cluster->start_pfn;
+                end = start + cluster->numpages;
+
+                if (start >= node_max_pfn || end <= node_min_pfn)
+                        continue;
+
+                if (end > node_max_pfn)
+                        end = node_max_pfn;
+                if (start < node_min_pfn)
+                        start = node_min_pfn;
+
+                if (start < start_kernel_pfn) {
+                        if (end > end_kernel_pfn
+                            && end - end_kernel_pfn >= bootmap_pages) {
+                                bootmap_start = end_kernel_pfn;
+                                break;
+                        } else if (end > start_kernel_pfn)
+                                end = start_kernel_pfn;
+                } else if (start < end_kernel_pfn)
+                        start = end_kernel_pfn;
+                if (end - start >= bootmap_pages) {
+                        bootmap_start = start;
+                        break;
+                }
+        }
+
+        if (bootmap_start == -1)
+                panic("couldn't find a contigous place for the bootmap");
+
+        /* Allocate the bootmap and mark the whole MM as reserved.  */
+        bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
+                                         node_min_pfn, node_max_pfn);
+        DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
+                 bootmap_start, bootmap_size, bootmap_pages);
+
+        /* Mark the free regions.  */
+        for_each_mem_cluster(memdesc, cluster, i) {
+                if (cluster->usage & 3)
+                        continue;
+
+                start = cluster->start_pfn;
+                end = cluster->start_pfn + cluster->numpages;
+
+                if (start >= node_max_pfn || end <= node_min_pfn)
+                        continue;
+
+                if (end > node_max_pfn)
+                        end = node_max_pfn;
+                if (start < node_min_pfn)
+                        start = node_min_pfn;
+
+                if (start < start_kernel_pfn) {
+                        if (end > end_kernel_pfn) {
+                                free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
+                                             (PFN_PHYS(start_kernel_pfn)
+                                              - PFN_PHYS(start)));
+                                printk(" freeing pages %ld:%ld\n",
+                                       start, start_kernel_pfn);
+                                start = end_kernel_pfn;
+                        } else if (end > start_kernel_pfn)
+                                end = start_kernel_pfn;
+                } else if (start < end_kernel_pfn)
+                        start = end_kernel_pfn;
+                if (start >= end)
+                        continue;
+
+                free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
+                printk(" freeing pages %ld:%ld\n", start, end);
+        }
+
+        /* Reserve the bootmap memory.  */
+        reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start), bootmap_size);
+        printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
+
+        node_set_online(nid);
+}
+
+void __init
+setup_memory(void *kernel_end)
+{
+        int nid;
+
+        show_mem_layout();
+
+        nodes_clear(node_online_map);
+
+        min_low_pfn = ~0UL;
+        max_low_pfn = 0UL;
+        for (nid = 0; nid < MAX_NUMNODES; nid++)
+                setup_memory_node(nid, kernel_end);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+        initrd_start = INITRD_START;
+        if (initrd_start) {
+                extern void *move_initrd(unsigned long);
+
+                initrd_end = initrd_start+INITRD_SIZE;
+                printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
+                       (void *) initrd_start, INITRD_SIZE);
+
+                if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
+                        if (!move_initrd(PFN_PHYS(max_low_pfn)))
+                                printk("initrd extends beyond end of memory "
+                                       "(0x%08lx > 0x%p)\ndisabling initrd\n",
+                                       initrd_end,
+                                       phys_to_virt(PFN_PHYS(max_low_pfn)));
+                } else {
+                        nid = kvaddr_to_nid(initrd_start);
+                        reserve_bootmem_node(NODE_DATA(nid),
+                                             virt_to_phys((void *)initrd_start),
+                                             INITRD_SIZE);
+                }
+        }
+#endif /* CONFIG_BLK_DEV_INITRD */
+}
+
+void __init paging_init(void)
+{
+        unsigned int    nid;
+        unsigned long   zones_size[MAX_NR_ZONES] = {0, };
+        unsigned long   dma_local_pfn;
+
+        /*
+         * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
+         * in the NUMA model, for now we convert it to a pfn and
+         * we interpret this pfn as a local per-node information.
+         * This issue isn't very important since none of these machines
+         * have legacy ISA slots anyways.
+         */
+        dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+
+        for_each_online_node(nid) {
+                unsigned long start_pfn = node_bdata[nid].node_boot_start >> PAGE_SHIFT;
+                unsigned long end_pfn = node_bdata[nid].node_low_pfn;
+
+                if (dma_local_pfn >= end_pfn - start_pfn)
+                        zones_size[ZONE_DMA] = end_pfn - start_pfn;
+                else {
+                        zones_size[ZONE_DMA] = dma_local_pfn;
+                        zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
+                }
+                free_area_init_node(nid, NODE_DATA(nid), zones_size, start_pfn, NULL);
+        }
+
+        /* Initialize the kernel's ZERO_PGE. */
+        memset((void *)ZERO_PGE, 0, PAGE_SIZE);
+}
+
+void __init mem_init(void)
+{
+        unsigned long codesize, reservedpages, datasize, initsize, pfn;
+        extern int page_is_ram(unsigned long) __init;
+        extern char _text, _etext, _data, _edata;
+        extern char __init_begin, __init_end;
+        unsigned long nid, i;
+        struct page * lmem_map;
+
+        high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+
+        reservedpages = 0;
+        for_each_online_node(nid) {
+                /*
+                 * This will free up the bootmem, ie, slot 0 memory
+                 */
+                totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
+
+                lmem_map = node_mem_map(nid);
+                pfn = NODE_DATA(nid)->node_start_pfn;
+                for (i = 0; i < node_spanned_pages(nid); i++, pfn++)
+                        if (page_is_ram(pfn) && PageReserved(lmem_map+i))
+                                reservedpages++;
+        }
+
+        codesize =  (unsigned long) &_etext - (unsigned long) &_text;
+        datasize =  (unsigned long) &_edata - (unsigned long) &_data;
+        initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+        printk("Memory: %luk/%luk available (%luk kernel code, %luk reserved, "
+               "%luk data, %luk init)\n",
+               (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
+               num_physpages << (PAGE_SHIFT-10),
+               codesize >> 10,
+               reservedpages << (PAGE_SHIFT-10),
+               datasize >> 10,
+               initsize >> 10);
+#if 0
+        mem_stress();
+#endif
+}
+
+void
+show_mem(void)
+{
+        long i,free = 0,total = 0,reserved = 0;
+        long shared = 0, cached = 0;
+        int nid;
+
+        printk("\nMem-info:\n");
+        show_free_areas();
+        printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+        for_each_online_node(nid) {
+                struct page * lmem_map = node_mem_map(nid);
+                i = node_spanned_pages(nid);
+                while (i-- > 0) {
+                        total++;
+                        if (PageReserved(lmem_map+i))
+                                reserved++;
+                        else if (PageSwapCache(lmem_map+i))
+                                cached++;
+                        else if (!page_count(lmem_map+i))
+                                free++;
+                        else
+                                shared += page_count(lmem_map + i) - 1;
+                }
+        }
+        printk("%ld pages of RAM\n",total);
+        printk("%ld free pages\n",free);
+        printk("%ld reserved pages\n",reserved);
+        printk("%ld pages shared\n",shared);
+        printk("%ld pages swap cached\n",cached);
+}