1/*
2 * Copyright 2004 James Cleverdon, IBM.
3 * Subject to the GNU Public License, v.2
4 *
5 * Flat APIC subarch code.
6 *
7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
9 * James Cleverdon.
10 */
11#include <linux/errno.h>
12#include <linux/threads.h>
13#include <linux/cpumask.h>
14#include <linux/string.h>
15#include <linux/kernel.h>
16#include <linux/ctype.h>
17#include <linux/hardirq.h>
18#include <linux/module.h>
19#include <asm/smp.h>
20#include <asm/apic.h>
21#include <asm/ipi.h>
22
23#include <linux/acpi.h>
24
25static struct apic apic_physflat;
26static struct apic apic_flat;
27
28struct apic __read_mostly *apic = &apic_flat;
29EXPORT_SYMBOL_GPL(apic);
30
31static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
32{
33	return 1;
34}
35
36/*
37 * Set up the logical destination ID.
38 *
39 * Intel recommends to set DFR, LDR and TPR before enabling
40 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
41 * document number 292116).  So here it goes...
42 */
43void flat_init_apic_ldr(void)
44{
45	unsigned long val;
46	unsigned long num, id;
47
48	num = smp_processor_id();
49	id = 1UL << num;
50	apic_write(APIC_DFR, APIC_DFR_FLAT);
51	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
52	val |= SET_APIC_LOGICAL_ID(id);
53	apic_write(APIC_LDR, val);
54}
55
56static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
57{
58	unsigned long flags;
59
60	local_irq_save(flags);
61	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
62	local_irq_restore(flags);
63}
64
65static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
66{
67	unsigned long mask = cpumask_bits(cpumask)[0];
68
69	_flat_send_IPI_mask(mask, vector);
70}
71
72static void
73flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
74{
75	unsigned long mask = cpumask_bits(cpumask)[0];
76	int cpu = smp_processor_id();
77
78	if (cpu < BITS_PER_LONG)
79		clear_bit(cpu, &mask);
80
81	_flat_send_IPI_mask(mask, vector);
82}
83
84static void flat_send_IPI_allbutself(int vector)
85{
86	int cpu = smp_processor_id();
87#ifdef	CONFIG_HOTPLUG_CPU
88	int hotplug = 1;
89#else
90	int hotplug = 0;
91#endif
92	if (hotplug || vector == NMI_VECTOR) {
93		if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
94			unsigned long mask = cpumask_bits(cpu_online_mask)[0];
95
96			if (cpu < BITS_PER_LONG)
97				clear_bit(cpu, &mask);
98
99			_flat_send_IPI_mask(mask, vector);
100		}
101	} else if (num_online_cpus() > 1) {
102		__default_send_IPI_shortcut(APIC_DEST_ALLBUT,
103					    vector, apic->dest_logical);
104	}
105}
106
107static void flat_send_IPI_all(int vector)
108{
109	if (vector == NMI_VECTOR) {
110		flat_send_IPI_mask(cpu_online_mask, vector);
111	} else {
112		__default_send_IPI_shortcut(APIC_DEST_ALLINC,
113					    vector, apic->dest_logical);
114	}
115}
116
117static unsigned int flat_get_apic_id(unsigned long x)
118{
119	unsigned int id;
120
121	id = (((x)>>24) & 0xFFu);
122
123	return id;
124}
125
126static unsigned long set_apic_id(unsigned int id)
127{
128	unsigned long x;
129
130	x = ((id & 0xFFu)<<24);
131	return x;
132}
133
134static unsigned int read_xapic_id(void)
135{
136	unsigned int id;
137
138	id = flat_get_apic_id(apic_read(APIC_ID));
139	return id;
140}
141
142static int flat_apic_id_registered(void)
143{
144	return physid_isset(read_xapic_id(), phys_cpu_present_map);
145}
146
147static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
148{
149	return initial_apic_id >> index_msb;
150}
151
152static int flat_probe(void)
153{
154	return 1;
155}
156
157static struct apic apic_flat =  {
158	.name				= "flat",
159	.probe				= flat_probe,
160	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
161	.apic_id_valid			= default_apic_id_valid,
162	.apic_id_registered		= flat_apic_id_registered,
163
164	.irq_delivery_mode		= dest_LowestPrio,
165	.irq_dest_mode			= 1, /* logical */
166
167	.target_cpus			= online_target_cpus,
168	.disable_esr			= 0,
169	.dest_logical			= APIC_DEST_LOGICAL,
170	.check_apicid_used		= NULL,
171
172	.vector_allocation_domain	= flat_vector_allocation_domain,
173	.init_apic_ldr			= flat_init_apic_ldr,
174
175	.ioapic_phys_id_map		= NULL,
176	.setup_apic_routing		= NULL,
177	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
178	.apicid_to_cpu_present		= NULL,
179	.check_phys_apicid_present	= default_check_phys_apicid_present,
180	.phys_pkg_id			= flat_phys_pkg_id,
181
182	.get_apic_id			= flat_get_apic_id,
183	.set_apic_id			= set_apic_id,
184	.apic_id_mask			= 0xFFu << 24,
185
186	.cpu_mask_to_apicid_and		= flat_cpu_mask_to_apicid_and,
187
188	.send_IPI_mask			= flat_send_IPI_mask,
189	.send_IPI_mask_allbutself	= flat_send_IPI_mask_allbutself,
190	.send_IPI_allbutself		= flat_send_IPI_allbutself,
191	.send_IPI_all			= flat_send_IPI_all,
192	.send_IPI_self			= apic_send_IPI_self,
193
194	.inquire_remote_apic		= default_inquire_remote_apic,
195
196	.read				= native_apic_mem_read,
197	.write				= native_apic_mem_write,
198	.eoi_write			= native_apic_mem_write,
199	.icr_read			= native_apic_icr_read,
200	.icr_write			= native_apic_icr_write,
201	.wait_icr_idle			= native_apic_wait_icr_idle,
202	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
203};
204
205/*
206 * Physflat mode is used when there are more than 8 CPUs on a system.
207 * We cannot use logical delivery in this case because the mask
208 * overflows, so use physical mode.
209 */
210static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
211{
212#ifdef CONFIG_ACPI
213	/*
214	 * Quirk: some x86_64 machines can only use physical APIC mode
215	 * regardless of how many processors are present (x86_64 ES7000
216	 * is an example).
217	 */
218	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
219		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
220		printk(KERN_DEBUG "system APIC only can use physical flat");
221		return 1;
222	}
223
224	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
225		printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
226		return 1;
227	}
228#endif
229
230	return 0;
231}
232
233static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
234{
235	default_send_IPI_mask_sequence_phys(cpumask, vector);
236}
237
238static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
239					      int vector)
240{
241	default_send_IPI_mask_allbutself_phys(cpumask, vector);
242}
243
244static void physflat_send_IPI_allbutself(int vector)
245{
246	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
247}
248
249static void physflat_send_IPI_all(int vector)
250{
251	physflat_send_IPI_mask(cpu_online_mask, vector);
252}
253
254static int physflat_probe(void)
255{
256	if (apic == &apic_physflat || num_possible_cpus() > 8)
257		return 1;
258
259	return 0;
260}
261
262static struct apic apic_physflat =  {
263
264	.name				= "physical flat",
265	.probe				= physflat_probe,
266	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
267	.apic_id_valid			= default_apic_id_valid,
268	.apic_id_registered		= flat_apic_id_registered,
269
270	.irq_delivery_mode		= dest_Fixed,
271	.irq_dest_mode			= 0, /* physical */
272
273	.target_cpus			= online_target_cpus,
274	.disable_esr			= 0,
275	.dest_logical			= 0,
276	.check_apicid_used		= NULL,
277
278	.vector_allocation_domain	= default_vector_allocation_domain,
279	/* not needed, but shouldn't hurt: */
280	.init_apic_ldr			= flat_init_apic_ldr,
281
282	.ioapic_phys_id_map		= NULL,
283	.setup_apic_routing		= NULL,
284	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
285	.apicid_to_cpu_present		= NULL,
286	.check_phys_apicid_present	= default_check_phys_apicid_present,
287	.phys_pkg_id			= flat_phys_pkg_id,
288
289	.get_apic_id			= flat_get_apic_id,
290	.set_apic_id			= set_apic_id,
291	.apic_id_mask			= 0xFFu << 24,
292
293	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
294
295	.send_IPI_mask			= physflat_send_IPI_mask,
296	.send_IPI_mask_allbutself	= physflat_send_IPI_mask_allbutself,
297	.send_IPI_allbutself		= physflat_send_IPI_allbutself,
298	.send_IPI_all			= physflat_send_IPI_all,
299	.send_IPI_self			= apic_send_IPI_self,
300
301	.inquire_remote_apic		= default_inquire_remote_apic,
302
303	.read				= native_apic_mem_read,
304	.write				= native_apic_mem_write,
305	.eoi_write			= native_apic_mem_write,
306	.icr_read			= native_apic_icr_read,
307	.icr_write			= native_apic_icr_write,
308	.wait_icr_idle			= native_apic_wait_icr_idle,
309	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
310};
311
312/*
313 * We need to check for physflat first, so this order is important.
314 */
315apic_drivers(apic_physflat, apic_flat);
316