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 <linux/topology.h>
10 #include <asm/sections.h>
11 #include <asm/processor.h>
12 #include <asm/setup.h>
13 #include <asm/mpspec.h>
14 #include <asm/apicdef.h>
15 #include <asm/highmem.h>
16 #include <asm/proto.h>
17 #include <asm/cpumask.h>
19 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
20 # define DBG(x...) printk(KERN_DEBUG x)
26 * Could be inside CONFIG_HAVE_SETUP_PER_CPU_AREA with other stuff but
27 * voyager wants cpu_number too.
30 DEFINE_PER_CPU(int, cpu_number
);
31 EXPORT_PER_CPU_SYMBOL(cpu_number
);
34 #ifdef CONFIG_X86_LOCAL_APIC
35 unsigned int num_processors
;
36 unsigned disabled_cpus __cpuinitdata
;
37 /* Processor that is doing the boot up */
38 unsigned int boot_cpu_physical_apicid
= -1U;
39 EXPORT_SYMBOL(boot_cpu_physical_apicid
);
40 unsigned int max_physical_apicid
;
42 /* Bitmask of physically existing CPUs */
43 physid_mask_t phys_cpu_present_map
;
47 * Map cpu index to physical APIC ID
49 DEFINE_EARLY_PER_CPU(u16
, x86_cpu_to_apicid
, BAD_APICID
);
50 DEFINE_EARLY_PER_CPU(u16
, x86_bios_cpu_apicid
, BAD_APICID
);
51 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid
);
52 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid
);
54 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
55 #define X86_64_NUMA 1 /* (used later) */
56 DEFINE_PER_CPU(int, node_number
) = 0;
57 EXPORT_PER_CPU_SYMBOL(node_number
);
60 * Map cpu index to node index
62 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map
, NUMA_NO_NODE
);
63 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map
);
66 * Which logical CPUs are on which nodes
68 cpumask_t
*node_to_cpumask_map
;
69 EXPORT_SYMBOL(node_to_cpumask_map
);
72 * Setup node_to_cpumask_map
74 static void __init
setup_node_to_cpumask_map(void);
77 static inline void setup_node_to_cpumask_map(void) { }
81 * Define load_pda_offset() and per-cpu __pda for x86_64.
82 * load_pda_offset() is responsible for loading the offset of pda into
85 * On SMP, pda offset also duals as percpu base address and thus it
86 * should be at the start of per-cpu area. To achieve this, it's
87 * preallocated in vmlinux_64.lds.S directly instead of using
91 void __cpuinit
load_pda_offset(int cpu
)
93 /* Memory clobbers used to order pda/percpu accesses */
95 wrmsrl(MSR_GS_BASE
, cpu_pda(cpu
));
99 DEFINE_PER_CPU(struct x8664_pda
, __pda
);
101 EXPORT_PER_CPU_SYMBOL(__pda
);
102 #endif /* CONFIG_SMP && CONFIG_X86_64 */
106 /* correctly size the local cpu masks */
107 static void setup_cpu_local_masks(void)
109 alloc_bootmem_cpumask_var(&cpu_initialized_mask
);
110 alloc_bootmem_cpumask_var(&cpu_callin_mask
);
111 alloc_bootmem_cpumask_var(&cpu_callout_mask
);
112 alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask
);
115 #else /* CONFIG_X86_32 */
117 static inline void setup_cpu_local_masks(void)
121 #endif /* CONFIG_X86_32 */
123 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
125 * Copy data used in early init routines from the initial arrays to the
126 * per cpu data areas. These arrays then become expendable and the
127 * *_early_ptr's are zeroed indicating that the static arrays are gone.
129 static void __init
setup_per_cpu_maps(void)
133 for_each_possible_cpu(cpu
) {
134 per_cpu(x86_cpu_to_apicid
, cpu
) =
135 early_per_cpu_map(x86_cpu_to_apicid
, cpu
);
136 per_cpu(x86_bios_cpu_apicid
, cpu
) =
137 early_per_cpu_map(x86_bios_cpu_apicid
, cpu
);
139 per_cpu(x86_cpu_to_node_map
, cpu
) =
140 early_per_cpu_map(x86_cpu_to_node_map
, cpu
);
144 /* indicate the early static arrays will soon be gone */
145 early_per_cpu_ptr(x86_cpu_to_apicid
) = NULL
;
146 early_per_cpu_ptr(x86_bios_cpu_apicid
) = NULL
;
148 early_per_cpu_ptr(x86_cpu_to_node_map
) = NULL
;
153 unsigned long __per_cpu_offset
[NR_CPUS
] __read_mostly
= {
154 [0] = (unsigned long)__per_cpu_load
,
157 unsigned long __per_cpu_offset
[NR_CPUS
] __read_mostly
;
159 EXPORT_SYMBOL(__per_cpu_offset
);
163 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
164 * Always point %gs to its beginning
166 void __init
setup_per_cpu_areas(void)
168 ssize_t size
, old_size
;
171 unsigned long align
= 1;
173 /* Copy section for each CPU (we discard the original) */
174 old_size
= PERCPU_ENOUGH_ROOM
;
175 align
= max_t(unsigned long, PAGE_SIZE
, align
);
176 size
= roundup(old_size
, align
);
178 pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
179 NR_CPUS
, nr_cpumask_bits
, nr_cpu_ids
, nr_node_ids
);
181 pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size
);
183 for_each_possible_cpu(cpu
) {
184 #ifndef CONFIG_NEED_MULTIPLE_NODES
185 ptr
= __alloc_bootmem(size
, align
,
186 __pa(MAX_DMA_ADDRESS
));
188 int node
= early_cpu_to_node(cpu
);
189 if (!node_online(node
) || !NODE_DATA(node
)) {
190 ptr
= __alloc_bootmem(size
, align
,
191 __pa(MAX_DMA_ADDRESS
));
192 pr_info("cpu %d has no node %d or node-local memory\n",
194 pr_debug("per cpu data for cpu%d at %016lx\n",
197 ptr
= __alloc_bootmem_node(NODE_DATA(node
), size
, align
,
198 __pa(MAX_DMA_ADDRESS
));
199 pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
200 cpu
, node
, __pa(ptr
));
204 memcpy(ptr
, __per_cpu_load
, __per_cpu_end
- __per_cpu_start
);
205 per_cpu_offset(cpu
) = ptr
- __per_cpu_start
;
206 per_cpu(this_cpu_off
, cpu
) = per_cpu_offset(cpu
);
207 per_cpu(cpu_number
, cpu
) = cpu
;
209 per_cpu(irq_stack_ptr
, cpu
) =
210 (char *)per_cpu(irq_stack
, cpu
) + IRQ_STACK_SIZE
- 64;
212 * CPU0 modified pda in the init data area, reload pda
213 * offset for CPU0 and clear the area for others.
218 memset(cpu_pda(cpu
), 0, sizeof(*cpu_pda(cpu
)));
221 DBG("PERCPU: cpu %4d %p\n", cpu
, ptr
);
224 /* Setup percpu data maps */
225 setup_per_cpu_maps();
227 /* Setup node to cpumask map */
228 setup_node_to_cpumask_map();
230 /* Setup cpu initialized, callin, callout masks */
231 setup_cpu_local_masks();
239 * Allocate node_to_cpumask_map based on number of available nodes
240 * Requires node_possible_map to be valid.
242 * Note: node_to_cpumask() is not valid until after this is done.
243 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
245 static void __init
setup_node_to_cpumask_map(void)
247 unsigned int node
, num
= 0;
250 /* setup nr_node_ids if not done yet */
251 if (nr_node_ids
== MAX_NUMNODES
) {
252 for_each_node_mask(node
, node_possible_map
)
254 nr_node_ids
= num
+ 1;
257 /* allocate the map */
258 map
= alloc_bootmem_low(nr_node_ids
* sizeof(cpumask_t
));
259 DBG("node_to_cpumask_map at %p for %d nodes\n", map
, nr_node_ids
);
261 pr_debug("Node to cpumask map at %p for %d nodes\n",
264 /* node_to_cpumask() will now work */
265 node_to_cpumask_map
= map
;
268 void __cpuinit
numa_set_node(int cpu
, int node
)
270 int *cpu_to_node_map
= early_per_cpu_ptr(x86_cpu_to_node_map
);
272 /* early setting, no percpu area yet */
273 if (cpu_to_node_map
) {
274 cpu_to_node_map
[cpu
] = node
;
278 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
279 if (cpu
>= nr_cpu_ids
|| !per_cpu_offset(cpu
)) {
280 printk(KERN_ERR
"numa_set_node: invalid cpu# (%d)\n", cpu
);
285 per_cpu(x86_cpu_to_node_map
, cpu
) = node
;
287 if (node
!= NUMA_NO_NODE
)
288 per_cpu(node_number
, cpu
) = node
;
291 void __cpuinit
numa_clear_node(int cpu
)
293 numa_set_node(cpu
, NUMA_NO_NODE
);
296 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
298 void __cpuinit
numa_add_cpu(int cpu
)
300 cpu_set(cpu
, node_to_cpumask_map
[early_cpu_to_node(cpu
)]);
303 void __cpuinit
numa_remove_cpu(int cpu
)
305 cpu_clear(cpu
, node_to_cpumask_map
[early_cpu_to_node(cpu
)]);
308 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
311 * --------- debug versions of the numa functions ---------
313 static void __cpuinit
numa_set_cpumask(int cpu
, int enable
)
315 int node
= early_cpu_to_node(cpu
);
319 if (node_to_cpumask_map
== NULL
) {
320 printk(KERN_ERR
"node_to_cpumask_map NULL\n");
325 mask
= &node_to_cpumask_map
[node
];
329 cpu_clear(cpu
, *mask
);
331 cpulist_scnprintf(buf
, sizeof(buf
), mask
);
332 printk(KERN_DEBUG
"%s cpu %d node %d: mask now %s\n",
333 enable
? "numa_add_cpu" : "numa_remove_cpu", cpu
, node
, buf
);
336 void __cpuinit
numa_add_cpu(int cpu
)
338 numa_set_cpumask(cpu
, 1);
341 void __cpuinit
numa_remove_cpu(int cpu
)
343 numa_set_cpumask(cpu
, 0);
346 int cpu_to_node(int cpu
)
348 if (early_per_cpu_ptr(x86_cpu_to_node_map
)) {
350 "cpu_to_node(%d): usage too early!\n", cpu
);
352 return early_per_cpu_ptr(x86_cpu_to_node_map
)[cpu
];
354 return per_cpu(x86_cpu_to_node_map
, cpu
);
356 EXPORT_SYMBOL(cpu_to_node
);
359 * Same function as cpu_to_node() but used if called before the
360 * per_cpu areas are setup.
362 int early_cpu_to_node(int cpu
)
364 if (early_per_cpu_ptr(x86_cpu_to_node_map
))
365 return early_per_cpu_ptr(x86_cpu_to_node_map
)[cpu
];
367 if (!per_cpu_offset(cpu
)) {
369 "early_cpu_to_node(%d): no per_cpu area!\n", cpu
);
373 return per_cpu(x86_cpu_to_node_map
, cpu
);
378 static const cpumask_t cpu_mask_none
;
381 * Returns a pointer to the bitmask of CPUs on Node 'node'.
383 const cpumask_t
*cpumask_of_node(int node
)
385 if (node_to_cpumask_map
== NULL
) {
387 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
390 return (const cpumask_t
*)&cpu_online_map
;
392 if (node
>= nr_node_ids
) {
394 "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
397 return &cpu_mask_none
;
399 return &node_to_cpumask_map
[node
];
401 EXPORT_SYMBOL(cpumask_of_node
);
404 * Returns a bitmask of CPUs on Node 'node'.
406 * Side note: this function creates the returned cpumask on the stack
407 * so with a high NR_CPUS count, excessive stack space is used. The
408 * node_to_cpumask_ptr function should be used whenever possible.
410 cpumask_t
node_to_cpumask(int node
)
412 if (node_to_cpumask_map
== NULL
) {
414 "node_to_cpumask(%d): no node_to_cpumask_map!\n", node
);
416 return cpu_online_map
;
418 if (node
>= nr_node_ids
) {
420 "node_to_cpumask(%d): node > nr_node_ids(%d)\n",
423 return cpu_mask_none
;
425 return node_to_cpumask_map
[node
];
427 EXPORT_SYMBOL(node_to_cpumask
);
430 * --------- end of debug versions of the numa functions ---------
433 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
435 #endif /* X86_64_NUMA */