1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2004 James Cleverdon, IBM.
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/cpumask.h>
12 #include <linux/export.h>
13 #include <linux/acpi.h>
14
15 #include <asm/jailhouse_para.h>
16 #include <asm/apic.h>
17
18 #include "local.h"
19
20 static struct apic apic_physflat;
21 static struct apic apic_flat;
22
23 struct apic *apic __ro_after_init = &apic_flat;
24 EXPORT_SYMBOL_GPL(apic);
25
flat_acpi_madt_oem_check(char * oem_id,char * oem_table_id)26 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
27 {
28 return 1;
29 }
30
_flat_send_IPI_mask(unsigned long mask,int vector)31 static void _flat_send_IPI_mask(unsigned long mask, int vector)
32 {
33 unsigned long flags;
34
35 local_irq_save(flags);
36 __default_send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL);
37 local_irq_restore(flags);
38 }
39
flat_send_IPI_mask(const struct cpumask * cpumask,int vector)40 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
41 {
42 unsigned long mask = cpumask_bits(cpumask)[0];
43
44 _flat_send_IPI_mask(mask, vector);
45 }
46
47 static void
flat_send_IPI_mask_allbutself(const struct cpumask * cpumask,int vector)48 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
49 {
50 unsigned long mask = cpumask_bits(cpumask)[0];
51 int cpu = smp_processor_id();
52
53 if (cpu < BITS_PER_LONG)
54 __clear_bit(cpu, &mask);
55
56 _flat_send_IPI_mask(mask, vector);
57 }
58
flat_get_apic_id(unsigned long x)59 static unsigned int flat_get_apic_id(unsigned long x)
60 {
61 return (x >> 24) & 0xFF;
62 }
63
set_apic_id(unsigned int id)64 static u32 set_apic_id(unsigned int id)
65 {
66 return (id & 0xFF) << 24;
67 }
68
flat_phys_pkg_id(int initial_apic_id,int index_msb)69 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
70 {
71 return initial_apic_id >> index_msb;
72 }
73
flat_probe(void)74 static int flat_probe(void)
75 {
76 return 1;
77 }
78
79 static struct apic apic_flat __ro_after_init = {
80 .name = "flat",
81 .probe = flat_probe,
82 .acpi_madt_oem_check = flat_acpi_madt_oem_check,
83 .apic_id_registered = default_apic_id_registered,
84
85 .delivery_mode = APIC_DELIVERY_MODE_FIXED,
86 .dest_mode_logical = true,
87
88 .disable_esr = 0,
89
90 .init_apic_ldr = default_init_apic_ldr,
91 .cpu_present_to_apicid = default_cpu_present_to_apicid,
92 .phys_pkg_id = flat_phys_pkg_id,
93
94 .max_apic_id = 0xFE,
95 .get_apic_id = flat_get_apic_id,
96 .set_apic_id = set_apic_id,
97
98 .calc_dest_apicid = apic_flat_calc_apicid,
99
100 .send_IPI = default_send_IPI_single,
101 .send_IPI_mask = flat_send_IPI_mask,
102 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
103 .send_IPI_allbutself = default_send_IPI_allbutself,
104 .send_IPI_all = default_send_IPI_all,
105 .send_IPI_self = default_send_IPI_self,
106
107 .read = native_apic_mem_read,
108 .write = native_apic_mem_write,
109 .eoi = native_apic_mem_eoi,
110 .icr_read = native_apic_icr_read,
111 .icr_write = native_apic_icr_write,
112 .wait_icr_idle = apic_mem_wait_icr_idle,
113 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout,
114 };
115
116 /*
117 * Physflat mode is used when there are more than 8 CPUs on a system.
118 * We cannot use logical delivery in this case because the mask
119 * overflows, so use physical mode.
120 */
physflat_acpi_madt_oem_check(char * oem_id,char * oem_table_id)121 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
122 {
123 #ifdef CONFIG_ACPI
124 /*
125 * Quirk: some x86_64 machines can only use physical APIC mode
126 * regardless of how many processors are present (x86_64 ES7000
127 * is an example).
128 */
129 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
130 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
131 printk(KERN_DEBUG "system APIC only can use physical flat");
132 return 1;
133 }
134
135 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
136 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
137 return 1;
138 }
139 #endif
140
141 return 0;
142 }
143
physflat_probe(void)144 static int physflat_probe(void)
145 {
146 return apic == &apic_physflat || num_possible_cpus() > 8 || jailhouse_paravirt();
147 }
148
149 static struct apic apic_physflat __ro_after_init = {
150
151 .name = "physical flat",
152 .probe = physflat_probe,
153 .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
154 .apic_id_registered = default_apic_id_registered,
155
156 .delivery_mode = APIC_DELIVERY_MODE_FIXED,
157 .dest_mode_logical = false,
158
159 .disable_esr = 0,
160
161 .check_apicid_used = NULL,
162 .ioapic_phys_id_map = NULL,
163 .cpu_present_to_apicid = default_cpu_present_to_apicid,
164 .phys_pkg_id = flat_phys_pkg_id,
165
166 .max_apic_id = 0xFE,
167 .get_apic_id = flat_get_apic_id,
168 .set_apic_id = set_apic_id,
169
170 .calc_dest_apicid = apic_default_calc_apicid,
171
172 .send_IPI = default_send_IPI_single_phys,
173 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
174 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys,
175 .send_IPI_allbutself = default_send_IPI_allbutself,
176 .send_IPI_all = default_send_IPI_all,
177 .send_IPI_self = default_send_IPI_self,
178
179 .read = native_apic_mem_read,
180 .write = native_apic_mem_write,
181 .eoi = native_apic_mem_eoi,
182 .icr_read = native_apic_icr_read,
183 .icr_write = native_apic_icr_write,
184 .wait_icr_idle = apic_mem_wait_icr_idle,
185 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout,
186 };
187
188 /*
189 * We need to check for physflat first, so this order is important.
190 */
191 apic_drivers(apic_physflat, apic_flat);
192