1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/init.h>
4 #include <linux/bootmem.h>
5 #include <linux/percpu.h>
6 #include <linux/kexec.h>
7 #include <linux/crash_dump.h>
9 #include <asm/percpu.h>
10 #include <asm/sections.h>
11 #include <asm/processor.h>
12 #include <asm/setup.h>
13 #include <asm/topology.h>
14 #include <asm/mpspec.h>
15 #include <asm/apicdef.h>
16 #include <asm/highmem.h>
18 #ifdef CONFIG_X86_LOCAL_APIC
19 unsigned int num_processors
;
20 unsigned disabled_cpus __cpuinitdata
;
21 /* Processor that is doing the boot up */
22 unsigned int boot_cpu_physical_apicid
= -1U;
23 unsigned int max_physical_apicid
;
24 EXPORT_SYMBOL(boot_cpu_physical_apicid
);
26 /* Bitmask of physically existing CPUs */
27 physid_mask_t phys_cpu_present_map
;
30 /* map cpu index to physical APIC ID */
31 DEFINE_EARLY_PER_CPU(u16
, x86_cpu_to_apicid
, BAD_APICID
);
32 DEFINE_EARLY_PER_CPU(u16
, x86_bios_cpu_apicid
, BAD_APICID
);
33 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid
);
34 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid
);
36 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
39 /* map cpu index to node index */
40 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map
, NUMA_NO_NODE
);
41 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map
);
43 /* which logical CPUs are on which nodes */
44 cpumask_t
*node_to_cpumask_map
;
45 EXPORT_SYMBOL(node_to_cpumask_map
);
47 /* setup node_to_cpumask_map */
48 static void __init
setup_node_to_cpumask_map(void);
51 static inline void setup_node_to_cpumask_map(void) { }
54 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
56 * Copy data used in early init routines from the initial arrays to the
57 * per cpu data areas. These arrays then become expendable and the
58 * *_early_ptr's are zeroed indicating that the static arrays are gone.
60 static void __init
setup_per_cpu_maps(void)
64 for_each_possible_cpu(cpu
) {
65 per_cpu(x86_cpu_to_apicid
, cpu
) =
66 early_per_cpu_map(x86_cpu_to_apicid
, cpu
);
67 per_cpu(x86_bios_cpu_apicid
, cpu
) =
68 early_per_cpu_map(x86_bios_cpu_apicid
, cpu
);
70 per_cpu(x86_cpu_to_node_map
, cpu
) =
71 early_per_cpu_map(x86_cpu_to_node_map
, cpu
);
75 /* indicate the early static arrays will soon be gone */
76 early_per_cpu_ptr(x86_cpu_to_apicid
) = NULL
;
77 early_per_cpu_ptr(x86_bios_cpu_apicid
) = NULL
;
79 early_per_cpu_ptr(x86_cpu_to_node_map
) = NULL
;
85 * Great future not-so-futuristic plan: make i386 and x86_64 do it
88 unsigned long __per_cpu_offset
[NR_CPUS
] __read_mostly
;
89 EXPORT_SYMBOL(__per_cpu_offset
);
90 static inline void setup_cpu_pda_map(void) { }
92 #elif !defined(CONFIG_SMP)
93 static inline void setup_cpu_pda_map(void) { }
95 #else /* CONFIG_SMP && CONFIG_X86_64 */
98 * Allocate cpu_pda pointer table and array via alloc_bootmem.
100 static void __init
setup_cpu_pda_map(void)
103 struct x8664_pda
**new_cpu_pda
;
107 size
= roundup(sizeof(struct x8664_pda
), cache_line_size());
109 /* allocate cpu_pda array and pointer table */
111 unsigned long tsize
= nr_cpu_ids
* sizeof(void *);
112 unsigned long asize
= size
* (nr_cpu_ids
- 1);
114 tsize
= roundup(tsize
, cache_line_size());
115 new_cpu_pda
= alloc_bootmem(tsize
+ asize
);
116 pda
= (char *)new_cpu_pda
+ tsize
;
119 /* initialize pointer table to static pda's */
120 for_each_possible_cpu(cpu
) {
122 /* leave boot cpu pda in place */
123 new_cpu_pda
[0] = cpu_pda(0);
126 new_cpu_pda
[cpu
] = (struct x8664_pda
*)pda
;
127 new_cpu_pda
[cpu
]->in_bootmem
= 1;
131 /* point to new pointer table */
132 _cpu_pda
= new_cpu_pda
;
138 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
139 * Always point %gs to its beginning
141 void __init
setup_per_cpu_areas(void)
143 ssize_t size
, old_size
;
146 unsigned long align
= 1;
148 /* Setup cpu_pda map */
151 /* Copy section for each CPU (we discard the original) */
152 old_size
= PERCPU_ENOUGH_ROOM
;
153 align
= max_t(unsigned long, PAGE_SIZE
, align
);
154 size
= roundup(old_size
, align
);
156 pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
157 NR_CPUS
, nr_cpumask_bits
, nr_cpu_ids
, nr_node_ids
);
159 pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size
);
161 for_each_possible_cpu(cpu
) {
162 #ifndef CONFIG_NEED_MULTIPLE_NODES
163 ptr
= __alloc_bootmem(size
, align
,
164 __pa(MAX_DMA_ADDRESS
));
166 int node
= early_cpu_to_node(cpu
);
167 if (!node_online(node
) || !NODE_DATA(node
)) {
168 ptr
= __alloc_bootmem(size
, align
,
169 __pa(MAX_DMA_ADDRESS
));
170 pr_info("cpu %d has no node %d or node-local memory\n",
172 pr_debug("per cpu data for cpu%d at %016lx\n",
175 ptr
= __alloc_bootmem_node(NODE_DATA(node
), size
, align
,
176 __pa(MAX_DMA_ADDRESS
));
177 pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
178 cpu
, node
, __pa(ptr
));
181 per_cpu_offset(cpu
) = ptr
- __per_cpu_start
;
182 memcpy(ptr
, __per_cpu_start
, __per_cpu_end
- __per_cpu_start
);
185 /* Setup percpu data maps */
186 setup_per_cpu_maps();
188 /* Setup node to cpumask map */
189 setup_node_to_cpumask_map();
197 * Allocate node_to_cpumask_map based on number of available nodes
198 * Requires node_possible_map to be valid.
200 * Note: node_to_cpumask() is not valid until after this is done.
202 static void __init
setup_node_to_cpumask_map(void)
204 unsigned int node
, num
= 0;
207 /* setup nr_node_ids if not done yet */
208 if (nr_node_ids
== MAX_NUMNODES
) {
209 for_each_node_mask(node
, node_possible_map
)
211 nr_node_ids
= num
+ 1;
214 /* allocate the map */
215 map
= alloc_bootmem_low(nr_node_ids
* sizeof(cpumask_t
));
217 pr_debug("Node to cpumask map at %p for %d nodes\n",
220 /* node_to_cpumask() will now work */
221 node_to_cpumask_map
= map
;
224 void __cpuinit
numa_set_node(int cpu
, int node
)
226 int *cpu_to_node_map
= early_per_cpu_ptr(x86_cpu_to_node_map
);
228 if (cpu_pda(cpu
) && node
!= NUMA_NO_NODE
)
229 cpu_pda(cpu
)->nodenumber
= node
;
232 cpu_to_node_map
[cpu
] = node
;
234 else if (per_cpu_offset(cpu
))
235 per_cpu(x86_cpu_to_node_map
, cpu
) = node
;
238 pr_debug("Setting node for non-present cpu %d\n", cpu
);
241 void __cpuinit
numa_clear_node(int cpu
)
243 numa_set_node(cpu
, NUMA_NO_NODE
);
246 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
248 void __cpuinit
numa_add_cpu(int cpu
)
250 cpu_set(cpu
, node_to_cpumask_map
[early_cpu_to_node(cpu
)]);
253 void __cpuinit
numa_remove_cpu(int cpu
)
255 cpu_clear(cpu
, node_to_cpumask_map
[cpu_to_node(cpu
)]);
258 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
261 * --------- debug versions of the numa functions ---------
263 static void __cpuinit
numa_set_cpumask(int cpu
, int enable
)
265 int node
= cpu_to_node(cpu
);
269 if (node_to_cpumask_map
== NULL
) {
270 printk(KERN_ERR
"node_to_cpumask_map NULL\n");
275 mask
= &node_to_cpumask_map
[node
];
279 cpu_clear(cpu
, *mask
);
281 cpulist_scnprintf(buf
, sizeof(buf
), mask
);
282 printk(KERN_DEBUG
"%s cpu %d node %d: mask now %s\n",
283 enable
? "numa_add_cpu":"numa_remove_cpu", cpu
, node
, buf
);
286 void __cpuinit
numa_add_cpu(int cpu
)
288 numa_set_cpumask(cpu
, 1);
291 void __cpuinit
numa_remove_cpu(int cpu
)
293 numa_set_cpumask(cpu
, 0);
296 int cpu_to_node(int cpu
)
298 if (early_per_cpu_ptr(x86_cpu_to_node_map
)) {
300 "cpu_to_node(%d): usage too early!\n", cpu
);
302 return early_per_cpu_ptr(x86_cpu_to_node_map
)[cpu
];
304 return per_cpu(x86_cpu_to_node_map
, cpu
);
306 EXPORT_SYMBOL(cpu_to_node
);
309 * Same function as cpu_to_node() but used if called before the
310 * per_cpu areas are setup.
312 int early_cpu_to_node(int cpu
)
314 if (early_per_cpu_ptr(x86_cpu_to_node_map
))
315 return early_per_cpu_ptr(x86_cpu_to_node_map
)[cpu
];
317 if (!per_cpu_offset(cpu
)) {
319 "early_cpu_to_node(%d): no per_cpu area!\n", cpu
);
323 return per_cpu(x86_cpu_to_node_map
, cpu
);
328 static const cpumask_t cpu_mask_none
;
331 * Returns a pointer to the bitmask of CPUs on Node 'node'.
333 const cpumask_t
*cpumask_of_node(int node
)
335 if (node_to_cpumask_map
== NULL
) {
337 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
340 return (const cpumask_t
*)&cpu_online_map
;
342 if (node
>= nr_node_ids
) {
344 "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
347 return &cpu_mask_none
;
349 return &node_to_cpumask_map
[node
];
351 EXPORT_SYMBOL(cpumask_of_node
);
354 * Returns a bitmask of CPUs on Node 'node'.
356 * Side note: this function creates the returned cpumask on the stack
357 * so with a high NR_CPUS count, excessive stack space is used. The
358 * node_to_cpumask_ptr function should be used whenever possible.
360 cpumask_t
node_to_cpumask(int node
)
362 if (node_to_cpumask_map
== NULL
) {
364 "node_to_cpumask(%d): no node_to_cpumask_map!\n", node
);
366 return cpu_online_map
;
368 if (node
>= nr_node_ids
) {
370 "node_to_cpumask(%d): node > nr_node_ids(%d)\n",
373 return cpu_mask_none
;
375 return node_to_cpumask_map
[node
];
377 EXPORT_SYMBOL(node_to_cpumask
);
380 * --------- end of debug versions of the numa functions ---------
383 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
385 #endif /* X86_64_NUMA */