arch/mips/sgi-ip27/ip27-klnuma.c

   1 /*
   2  * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00.
   3  * Copyright 2000 - 2001 Silicon Graphics, Inc.
   4  * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com)
   5  */
   6 #include <linux/config.h>
   7 #include <linux/init.h>
   8 #include <linux/mmzone.h>
   9 #include <linux/kernel.h>
  10 #include <linux/string.h>
  11
  12 #include <asm/page.h>
  13 #include <asm/sections.h>
  14 #include <asm/smp.h>
  15 #include <asm/sn/types.h>
  16 #include <asm/sn/arch.h>
  17 #include <asm/sn/gda.h>
  18 #include <asm/sn/hub.h>
  19 #include <asm/sn/mapped_kernel.h>
  20 #include <asm/sn/sn_private.h>
  21
  22 extern char _end;
  23 static cpumask_t ktext_repmask;
  24
  25 /*
  26  * XXX - This needs to be much smarter about where it puts copies of the
  27  * kernel.  For example, we should never put a copy on a headless node,
  28  * and we should respect the topology of the machine.
  29  */
  30 void __init setup_replication_mask(int maxnodes)
  31 {
  32         static int      numa_kernel_replication_ratio;
  33         cnodeid_t       cnode;
  34
  35         /* Set only the master cnode's bit.  The master cnode is always 0. */
  36         cpus_clear(ktext_repmask);
  37         cpu_set(0, ktext_repmask);
  38
  39         numa_kernel_replication_ratio = 0;
  40 #ifdef CONFIG_REPLICATE_KTEXT
  41 #ifndef CONFIG_MAPPED_KERNEL
  42 #error Kernel replication works with mapped kernel support. No calias support.
  43 #endif
  44         numa_kernel_replication_ratio = 1;
  45 #endif
  46
  47         for (cnode = 1; cnode < numnodes; cnode++) {
  48                 /* See if this node should get a copy of the kernel */
  49                 if (numa_kernel_replication_ratio &&
  50                     !(cnode % numa_kernel_replication_ratio)) {
  51
  52                         /* Advertise that we have a copy of the kernel */
  53                         cpu_set(cnode, ktext_repmask);
  54                 }
  55         }
  56
  57         /* Set up a GDA pointer to the replication mask. */
  58         GDA->g_ktext_repmask = &ktext_repmask;
  59 }
  60
  61
  62 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
  63 {
  64         kern_vars_t *kvp;
  65         cnodeid_t client_cnode;
  66
  67         client_cnode = NASID_TO_COMPACT_NODEID(client_nasid);
  68
  69         kvp = &(HUB_DATA(client_nasid)->kern_vars);
  70
  71         KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
  72
  73         kvp->kv_magic = KV_MAGIC;
  74         kvp->kv_ro_nasid = server_nasid;
  75         kvp->kv_rw_nasid = master_nasid;
  76         kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
  77         kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
  78         printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
  79 }
  80
  81 /* XXX - When the BTE works, we should use it instead of this. */
  82 static __init void copy_kernel(nasid_t dest_nasid)
  83 {
  84         unsigned long dest_kern_start, source_start, source_end, kern_size;
  85
  86         source_start = (unsigned long) _stext;
  87         source_end = (unsigned long) _etext;
  88         kern_size = source_end - source_start;
  89
  90         dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
  91                                             dest_nasid);
  92         memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
  93 }
  94
  95 void __init replicate_kernel_text(int maxnodes)
  96 {
  97         cnodeid_t cnode;
  98         nasid_t client_nasid;
  99         nasid_t server_nasid;
 100
 101         server_nasid = master_nasid;
 102
 103         /* Record where the master node should get its kernel text */
 104         set_ktext_source(master_nasid, master_nasid);
 105
 106         for (cnode = 1; cnode < maxnodes; cnode++) {
 107                 client_nasid = COMPACT_TO_NASID_NODEID(cnode);
 108
 109                 /* Check if this node should get a copy of the kernel */
 110                 if (cpu_isset(cnode, ktext_repmask)) {
 111                         server_nasid = client_nasid;
 112                         copy_kernel(server_nasid);
 113                 }
 114
 115                 /* Record where this node should get its kernel text */
 116                 set_ktext_source(client_nasid, server_nasid);
 117         }
 118 }
 119
 120 /*
 121  * Return pfn of first free page of memory on a node. PROM may allocate
 122  * data structures on the first couple of pages of the first slot of each
 123  * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
 124  */
 125 pfn_t node_getfirstfree(cnodeid_t cnode)
 126 {
 127         unsigned long loadbase = CKSEG0;
 128         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
 129         unsigned long offset;
 130
 131 #ifdef CONFIG_MAPPED_KERNEL
 132         loadbase = CKSSEG + 16777216;
 133 #endif
 134         offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
 135         if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask)))
 136                 return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
 137         else
 138                 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
 139                                                                 PAGE_SHIFT);
 140 }
 141