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Diffstat (limited to 'arch/alpha/mm/numa.c')
| -rw-r--r-- | arch/alpha/mm/numa.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/arch/alpha/mm/numa.c b/arch/alpha/mm/numa.c new file mode 100644 index 000000000..0636e254a --- /dev/null +++ b/arch/alpha/mm/numa.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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/memblock.h> +#include <linux/swap.h> +#include <linux/initrd.h> +#include <linux/pfn.h> +#include <linux/module.h> + +#include <asm/hwrpb.h> +#include <asm/sections.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 start, end; + unsigned long node_pfn_start, node_pfn_end; + unsigned long node_min_pfn, node_max_pfn; + int i; + 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; + +#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 + 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)); + + /* Find the bounds of kernel memory. */ + start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS); + end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end)); + + if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn)) + panic("kernel loaded out of ram"); + + memblock_add_node(PFN_PHYS(node_min_pfn), + (node_max_pfn - node_min_pfn) << PAGE_SHIFT, nid); + + /* 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); + + NODE_DATA(nid)->node_start_pfn = node_min_pfn; + NODE_DATA(nid)->node_present_pages = node_max_pfn - node_min_pfn; + + node_set_online(nid); +} + +void __init +setup_memory(void *kernel_end) +{ + unsigned long kernel_size; + 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); + + kernel_size = virt_to_phys(kernel_end) - KERNEL_START_PHYS; + memblock_reserve(KERNEL_START_PHYS, kernel_size); + +#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); + memblock_reserve(virt_to_phys((void *)initrd_start), + INITRD_SIZE); + } + } +#endif /* CONFIG_BLK_DEV_INITRD */ +} + +void __init paging_init(void) +{ + unsigned long max_zone_pfn[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; + + max_zone_pfn[ZONE_DMA] = dma_local_pfn; + max_zone_pfn[ZONE_NORMAL] = max_pfn; + + free_area_init(max_zone_pfn); + + /* Initialize the kernel's ZERO_PGE. */ + memset((void *)ZERO_PGE, 0, PAGE_SIZE); +} |