Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ip27-klnuma.c
Go to the documentation of this file.
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 ([email protected])
5  */
6 #include <linux/init.h>
7 #include <linux/mm.h>
8 #include <linux/mmzone.h>
9 #include <linux/kernel.h>
10 #include <linux/nodemask.h>
11 #include <linux/string.h>
12 
13 #include <asm/page.h>
14 #include <asm/sections.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 static cpumask_t ktext_repmask;
23 
24 /*
25  * XXX - This needs to be much smarter about where it puts copies of the
26  * kernel. For example, we should never put a copy on a headless node,
27  * and we should respect the topology of the machine.
28  */
30 {
31  /* Set only the master cnode's bit. The master cnode is always 0. */
32  cpus_clear(ktext_repmask);
33  cpu_set(0, ktext_repmask);
34 
35 #ifdef CONFIG_REPLICATE_KTEXT
36 #ifndef CONFIG_MAPPED_KERNEL
37 #error Kernel replication works with mapped kernel support. No calias support.
38 #endif
39  {
40  cnodeid_t cnode;
41 
42  for_each_online_node(cnode) {
43  if (cnode == 0)
44  continue;
45  /* Advertise that we have a copy of the kernel */
46  cpu_set(cnode, ktext_repmask);
47  }
48  }
49 #endif
50  /* Set up a GDA pointer to the replication mask. */
51  GDA->g_ktext_repmask = &ktext_repmask;
52 }
53 
54 
55 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
56 {
57  kern_vars_t *kvp;
58 
59  kvp = &hub_data(client_nasid)->kern_vars;
60 
61  KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
62 
63  kvp->kv_magic = KV_MAGIC;
64  kvp->kv_ro_nasid = server_nasid;
66  kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
68  printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
69 }
70 
71 /* XXX - When the BTE works, we should use it instead of this. */
72 static __init void copy_kernel(nasid_t dest_nasid)
73 {
74  unsigned long dest_kern_start, source_start, source_end, kern_size;
75 
76  source_start = (unsigned long) _stext;
77  source_end = (unsigned long) _etext;
78  kern_size = source_end - source_start;
79 
80  dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
81  dest_nasid);
82  memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
83 }
84 
86 {
87  cnodeid_t cnode;
88  nasid_t client_nasid;
89  nasid_t server_nasid;
90 
91  server_nasid = master_nasid;
92 
93  /* Record where the master node should get its kernel text */
94  set_ktext_source(master_nasid, master_nasid);
95 
96  for_each_online_node(cnode) {
97  if (cnode == 0)
98  continue;
99  client_nasid = COMPACT_TO_NASID_NODEID(cnode);
100 
101  /* Check if this node should get a copy of the kernel */
102  if (cpu_isset(cnode, ktext_repmask)) {
103  server_nasid = client_nasid;
104  copy_kernel(server_nasid);
105  }
106 
107  /* Record where this node should get its kernel text */
108  set_ktext_source(client_nasid, server_nasid);
109  }
110 }
111 
112 /*
113  * Return pfn of first free page of memory on a node. PROM may allocate
114  * data structures on the first couple of pages of the first slot of each
115  * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
116  */
118 {
119  unsigned long loadbase = REP_BASE;
120  nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
121  unsigned long offset;
122 
123 #ifdef CONFIG_MAPPED_KERNEL
124  loadbase += 16777216;
125 #endif
126  offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
127  if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask)))
128  return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
129  else
130  return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
131  PAGE_SHIFT);
132 }