/* * linux/arch/alpha/mm/numa.c * * DISCONTIGMEM NUMA alpha support. * * Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE */ #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 <linux/pfn.h> #include <linux/module.h> #include <asm/hwrpb.h> #include <asm/pgalloc.h> pg_data_t node_data[MAX_NUMNODES]; EXPORT_SYMBOL(node_data); #undef DEBUG_DISCONTIG #ifdef DEBUG_DISCONTIG #define DBGDCONT(args...) printk(args) #else #define DBGDCONT(args...) #endif #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 = &bootmem_node_data[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, BOOTMEM_DEFAULT); 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, BOOTMEM_DEFAULT); } } #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) { bootmem_data_t *bdata = &bootmem_node_data[nid]; unsigned long start_pfn = bdata->node_min_pfn; unsigned long end_pfn = bdata->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, 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; 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)); pfn = NODE_DATA(nid)->node_start_pfn; for (i = 0; i < node_spanned_pages(nid); i++, pfn++) if (page_is_ram(pfn) && PageReserved(nid_page_nr(nid, 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 }