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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/alpha/mm/numa.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/alpha/mm/numa.c')
-rw-r--r-- | kernel/arch/alpha/mm/numa.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/kernel/arch/alpha/mm/numa.c b/kernel/arch/alpha/mm/numa.c new file mode 100644 index 000000000..d543d71c2 --- /dev/null +++ b/kernel/arch/alpha/mm/numa.c @@ -0,0 +1,321 @@ +/* + * 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> +#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 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; + +#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 contiguous 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; + } + node_set_state(nid, N_NORMAL_MEMORY); + free_area_init_node(nid, zones_size, start_pfn, NULL); + } + + /* Initialize the kernel's ZERO_PGE. */ + memset((void *)ZERO_PGE, 0, PAGE_SIZE); +} |