aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/apic/apic_flat_64.c
blob: 09d3b17ce0c2479ad0ba388f1b2840d6beb8972e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
/*
 * Copyright 2004 James Cleverdon, IBM.
 * Subject to the GNU Public License, v.2
 *
 * Flat APIC subarch code.
 *
 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
 * James Cleverdon.
 */
#include <linux/errno.h>
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/hardirq.h>
#include <asm/smp.h>
#include <asm/apic.h>
#include <asm/ipi.h>

#ifdef CONFIG_ACPI
#include <acpi/acpi_bus.h>
#endif

static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
	return 1;
}

static const struct cpumask *flat_target_cpus(void)
{
	return cpu_online_mask;
}

static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
{
	/* Careful. Some cpus do not strictly honor the set of cpus
	 * specified in the interrupt destination when using lowest
	 * priority interrupt delivery mode.
	 *
	 * In particular there was a hyperthreading cpu observed to
	 * deliver interrupts to the wrong hyperthread when only one
	 * hyperthread was specified in the interrupt desitination.
	 */
	cpumask_clear(retmask);
	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
}

/*
 * Set up the logical destination ID.
 *
 * Intel recommends to set DFR, LDR and TPR before enabling
 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
 * document number 292116).  So here it goes...
 */
static void flat_init_apic_ldr(void)
{
	unsigned long val;
	unsigned long num, id;

	num = smp_processor_id();
	id = 1UL << num;
	apic_write(APIC_DFR, APIC_DFR_FLAT);
	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
	val |= SET_APIC_LOGICAL_ID(id);
	apic_write(APIC_LDR, val);
}

static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
{
	unsigned long flags;

	local_irq_save(flags);
	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
	local_irq_restore(flags);
}

static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
{
	unsigned long mask = cpumask_bits(cpumask)[0];

	_flat_send_IPI_mask(mask, vector);
}

static void
 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
{
	unsigned long mask = cpumask_bits(cpumask)[0];
	int cpu = smp_processor_id();

	if (cpu < BITS_PER_LONG)
		clear_bit(cpu, &mask);

	_flat_send_IPI_mask(mask, vector);
}

static void flat_send_IPI_allbutself(int vector)
{
	int cpu = smp_processor_id();
#ifdef	CONFIG_HOTPLUG_CPU
	int hotplug = 1;
#else
	int hotplug = 0;
#endif
	if (hotplug || vector == NMI_VECTOR) {
		if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
			unsigned long mask = cpumask_bits(cpu_online_mask)[0];

			if (cpu < BITS_PER_LONG)
				clear_bit(cpu, &mask);

			_flat_send_IPI_mask(mask, vector);
		}
	} else if (num_online_cpus() > 1) {
		__default_send_IPI_shortcut(APIC_DEST_ALLBUT,
					    vector, apic->dest_logical);
	}
}

static void flat_send_IPI_all(int vector)
{
	if (vector == NMI_VECTOR) {
		flat_send_IPI_mask(cpu_online_mask, vector);
	} else {
		__default_send_IPI_shortcut(APIC_DEST_ALLINC,
					    vector, apic->dest_logical);
	}
}

static unsigned int flat_get_apic_id(unsigned long x)
{
	unsigned int id;

	id = (((x)>>24) & 0xFFu);

	return id;
}

static unsigned long set_apic_id(unsigned int id)
{
	unsigned long x;

	x = ((id & 0xFFu)<<24);
	return x;
}

static unsigned int read_xapic_id(void)
{
	unsigned int id;

	id = flat_get_apic_id(apic_read(APIC_ID));
	return id;
}

static int flat_apic_id_registered(void)
{
	return physid_isset(read_xapic_id(), phys_cpu_present_map);
}

static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
{
	return initial_apic_id >> index_msb;
}

struct apic apic_flat =  {
	.name				= "flat",
	.probe				= NULL,
	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
	.apic_id_registered		= flat_apic_id_registered,

	.irq_delivery_mode		= dest_LowestPrio,
	.irq_dest_mode			= 1, /* logical */

	.target_cpus			= flat_target_cpus,
	.disable_esr			= 0,
	.dest_logical			= APIC_DEST_LOGICAL,
	.check_apicid_used		= NULL,
	.check_apicid_present		= NULL,

	.vector_allocation_domain	= flat_vector_allocation_domain,
	.init_apic_ldr			= flat_init_apic_ldr,

	.ioapic_phys_id_map		= NULL,
	.setup_apic_routing		= NULL,
	.multi_timer_check		= NULL,
	.apicid_to_node			= NULL,
	.cpu_to_logical_apicid		= NULL,
	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
	.apicid_to_cpu_present		= NULL,
	.setup_portio_remap		= NULL,
	.check_phys_apicid_present	= default_check_phys_apicid_present,
	.enable_apic_mode		= NULL,
	.phys_pkg_id			= flat_phys_pkg_id,
	.mps_oem_check			= NULL,

	.get_apic_id			= flat_get_apic_id,
	.set_apic_id			= set_apic_id,
	.apic_id_mask			= 0xFFu << 24,

	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,

	.send_IPI_mask			= flat_send_IPI_mask,
	.send_IPI_mask_allbutself	= flat_send_IPI_mask_allbutself,
	.send_IPI_allbutself		= flat_send_IPI_allbutself,
	.send_IPI_all			= flat_send_IPI_all,
	.send_IPI_self			= apic_send_IPI_self,

	.trampoline_phys_low		= DEFAULT_TRAMPOLINE_PHYS_LOW,
	.trampoline_phys_high		= DEFAULT_TRAMPOLINE_PHYS_HIGH,
	.wait_for_init_deassert		= NULL,
	.smp_callin_clear_local_apic	= NULL,
	.inquire_remote_apic		= default_inquire_remote_apic,

	.read				= native_apic_mem_read,
	.write				= native_apic_mem_write,
	.icr_read			= native_apic_icr_read,
	.icr_write			= native_apic_icr_write,
	.wait_icr_idle			= native_apic_wait_icr_idle,
	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
};

/*
 * Physflat mode is used when there are more than 8 CPUs on a system.
 * We cannot use logical delivery in this case because the mask
 * overflows, so use physical mode.
 */
static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
#ifdef CONFIG_ACPI
	/*
	 * Quirk: some x86_64 machines can only use physical APIC mode
	 * regardless of how many processors are present (x86_64 ES7000
	 * is an example).
	 */
	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
		printk(KERN_DEBUG "system APIC only can use physical flat");
		return 1;
	}

	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
		printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
		return 1;
	}
#endif

	return 0;
}

static const struct cpumask *physflat_target_cpus(void)
{
	return cpu_online_mask;
}

static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
{
	cpumask_clear(retmask);
	cpumask_set_cpu(cpu, retmask);
}

static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
{
	default_send_IPI_mask_sequence_phys(cpumask, vector);
}

static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
					      int vector)
{
	default_send_IPI_mask_allbutself_phys(cpumask, vector);
}

static void physflat_send_IPI_allbutself(int vector)
{
	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
}

static void physflat_send_IPI_all(int vector)
{
	physflat_send_IPI_mask(cpu_online_mask, vector);
}

static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
{
	int cpu;

	/*
	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
	 * May as well be the first.
	 */
	cpu = cpumask_first(cpumask);
	if ((unsigned)cpu < nr_cpu_ids)
		return per_cpu(x86_cpu_to_apicid, cpu);
	else
		return BAD_APICID;
}

static unsigned int
physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
				const struct cpumask *andmask)
{
	int cpu;

	/*
	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
	 * May as well be the first.
	 */
	for_each_cpu_and(cpu, cpumask, andmask) {
		if (cpumask_test_cpu(cpu, cpu_online_mask))
			break;
	}
	return per_cpu(x86_cpu_to_apicid, cpu);
}

struct apic apic_physflat =  {

	.name				= "physical flat",
	.probe				= NULL,
	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
	.apic_id_registered		= flat_apic_id_registered,

	.irq_delivery_mode		= dest_Fixed,
	.irq_dest_mode			= 0, /* physical */

	.target_cpus			= physflat_target_cpus,
	.disable_esr			= 0,
	.dest_logical			= 0,
	.check_apicid_used		= NULL,
	.check_apicid_present		= NULL,

	.vector_allocation_domain	= physflat_vector_allocation_domain,
	/* not needed, but shouldn't hurt: */
	.init_apic_ldr			= flat_init_apic_ldr,

	.ioapic_phys_id_map		= NULL,
	.setup_apic_routing		= NULL,
	.multi_timer_check		= NULL,
	.apicid_to_node			= NULL,
	.cpu_to_logical_apicid		= NULL,
	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
	.apicid_to_cpu_present		= NULL,
	.setup_portio_remap		= NULL,
	.check_phys_apicid_present	= default_check_phys_apicid_present,
	.enable_apic_mode		= NULL,
	.phys_pkg_id			= flat_phys_pkg_id,
	.mps_oem_check			= NULL,

	.get_apic_id			= flat_get_apic_id,
	.set_apic_id			= set_apic_id,
	.apic_id_mask			= 0xFFu << 24,

	.cpu_mask_to_apicid		= physflat_cpu_mask_to_apicid,
	.cpu_mask_to_apicid_and		= physflat_cpu_mask_to_apicid_and,

	.send_IPI_mask			= physflat_send_IPI_mask,
	.send_IPI_mask_allbutself	= physflat_send_IPI_mask_allbutself,
	.send_IPI_allbutself		= physflat_send_IPI_allbutself,
	.send_IPI_all			= physflat_send_IPI_all,
	.send_IPI_self			= apic_send_IPI_self,

	.trampoline_phys_low		= DEFAULT_TRAMPOLINE_PHYS_LOW,
	.trampoline_phys_high		= DEFAULT_TRAMPOLINE_PHYS_HIGH,
	.wait_for_init_deassert		= NULL,
	.smp_callin_clear_local_apic	= NULL,
	.inquire_remote_apic		= default_inquire_remote_apic,

	.read				= native_apic_mem_read,
	.write				= native_apic_mem_write,
	.icr_read			= native_apic_icr_read,
	.icr_write			= native_apic_icr_write,
	.wait_icr_idle			= native_apic_wait_icr_idle,
	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
};