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	.wait_for_init_deassert		= false,
195	.inquire_remote_apic		= default_inquire_remote_apic,
196
197	.read				= native_apic_mem_read,
198	.write				= native_apic_mem_write,
199	.eoi_write			= native_apic_mem_write,
200	.icr_read			= native_apic_icr_read,
201	.icr_write			= native_apic_icr_write,
202	.wait_icr_idle			= native_apic_wait_icr_idle,
203	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
204};
205
206/*
207 * Physflat mode is used when there are more than 8 CPUs on a system.
208 * We cannot use logical delivery in this case because the mask
209 * overflows, so use physical mode.
210 */
211static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
212{
213#ifdef CONFIG_ACPI
214	/*
215	 * Quirk: some x86_64 machines can only use physical APIC mode
216	 * regardless of how many processors are present (x86_64 ES7000
217	 * is an example).
218	 */
219	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
220		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
221		printk(KERN_DEBUG "system APIC only can use physical flat");
222		return 1;
223	}
224
225	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
226		printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
227		return 1;
228	}
229#endif
230
231	return 0;
232}
233
234static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
235{
236	default_send_IPI_mask_sequence_phys(cpumask, vector);
237}
238
239static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
240					      int vector)
241{
242	default_send_IPI_mask_allbutself_phys(cpumask, vector);
243}
244
245static void physflat_send_IPI_allbutself(int vector)
246{
247	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
248}
249
250static void physflat_send_IPI_all(int vector)
251{
252	physflat_send_IPI_mask(cpu_online_mask, vector);
253}
254
255static int physflat_probe(void)
256{
257	if (apic == &apic_physflat || num_possible_cpus() > 8)
258		return 1;
259
260	return 0;
261}
262
263static struct apic apic_physflat =  {
264
265	.name				= "physical flat",
266	.probe				= physflat_probe,
267	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
268	.apic_id_valid			= default_apic_id_valid,
269	.apic_id_registered		= flat_apic_id_registered,
270
271	.irq_delivery_mode		= dest_Fixed,
272	.irq_dest_mode			= 0, /* physical */
273
274	.target_cpus			= online_target_cpus,
275	.disable_esr			= 0,
276	.dest_logical			= 0,
277	.check_apicid_used		= NULL,
278
279	.vector_allocation_domain	= default_vector_allocation_domain,
280	/* not needed, but shouldn't hurt: */
281	.init_apic_ldr			= flat_init_apic_ldr,
282
283	.ioapic_phys_id_map		= NULL,
284	.setup_apic_routing		= NULL,
285	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
286	.apicid_to_cpu_present		= NULL,
287	.check_phys_apicid_present	= default_check_phys_apicid_present,
288	.phys_pkg_id			= flat_phys_pkg_id,
289
290	.get_apic_id			= flat_get_apic_id,
291	.set_apic_id			= set_apic_id,
292	.apic_id_mask			= 0xFFu << 24,
293
294	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
295
296	.send_IPI_mask			= physflat_send_IPI_mask,
297	.send_IPI_mask_allbutself	= physflat_send_IPI_mask_allbutself,
298	.send_IPI_allbutself		= physflat_send_IPI_allbutself,
299	.send_IPI_all			= physflat_send_IPI_all,
300	.send_IPI_self			= apic_send_IPI_self,
301
302	.wait_for_init_deassert		= false,
303	.inquire_remote_apic		= default_inquire_remote_apic,
304
305	.read				= native_apic_mem_read,
306	.write				= native_apic_mem_write,
307	.eoi_write			= native_apic_mem_write,
308	.icr_read			= native_apic_icr_read,
309	.icr_write			= native_apic_icr_write,
310	.wait_icr_idle			= native_apic_wait_icr_idle,
311	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
312};
313
314/*
315 * We need to check for physflat first, so this order is important.
316 */
317apic_drivers(apic_physflat, apic_flat);
318