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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * NOOP APIC driver.
4 *
5 * Does almost nothing and should be substituted by a real apic driver via
6 * probe routine.
7 *
8 * Though in case if apic is disabled (for some reason) we try
9 * to not uglify the caller's code and allow to call (some) apic routines
10 * like self-ipi, etc...
11 */
12#include <linux/cpumask.h>
13
14#include <asm/apic.h>
15
16static void noop_init_apic_ldr(void) { }
17static void noop_send_IPI(int cpu, int vector) { }
18static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
19static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
20static void noop_send_IPI_allbutself(int vector) { }
21static void noop_send_IPI_all(int vector) { }
22static void noop_send_IPI_self(int vector) { }
23static void noop_apic_wait_icr_idle(void) { }
24static void noop_apic_icr_write(u32 low, u32 id) { }
25
26static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
27{
28 return -1;
29}
30
31static u32 noop_safe_apic_wait_icr_idle(void)
32{
33 return 0;
34}
35
36static u64 noop_apic_icr_read(void)
37{
38 return 0;
39}
40
41static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
42{
43 return 0;
44}
45
46static unsigned int noop_get_apic_id(unsigned long x)
47{
48 return 0;
49}
50
51static int noop_probe(void)
52{
53 /*
54 * NOOP apic should not ever be
55 * enabled via probe routine
56 */
57 return 0;
58}
59
60static int noop_apic_id_registered(void)
61{
62 /*
63 * if we would be really "pedantic"
64 * we should pass read_apic_id() here
65 * but since NOOP suppose APIC ID = 0
66 * lets save a few cycles
67 */
68 return physid_isset(0, phys_cpu_present_map);
69}
70
71static u32 noop_apic_read(u32 reg)
72{
73 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
74 return 0;
75}
76
77static void noop_apic_write(u32 reg, u32 v)
78{
79 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
80}
81
82#ifdef CONFIG_X86_32
83static int noop_x86_32_early_logical_apicid(int cpu)
84{
85 return BAD_APICID;
86}
87#endif
88
89struct apic apic_noop __ro_after_init = {
90 .name = "noop",
91 .probe = noop_probe,
92 .acpi_madt_oem_check = NULL,
93
94 .apic_id_valid = default_apic_id_valid,
95 .apic_id_registered = noop_apic_id_registered,
96
97 .irq_delivery_mode = dest_Fixed,
98 /* logical delivery broadcast to all CPUs: */
99 .irq_dest_mode = 1,
100
101 .disable_esr = 0,
102 .dest_logical = APIC_DEST_LOGICAL,
103 .check_apicid_used = default_check_apicid_used,
104
105 .init_apic_ldr = noop_init_apic_ldr,
106
107 .ioapic_phys_id_map = default_ioapic_phys_id_map,
108 .setup_apic_routing = NULL,
109
110 .cpu_present_to_apicid = default_cpu_present_to_apicid,
111 .apicid_to_cpu_present = physid_set_mask_of_physid,
112
113 .check_phys_apicid_present = default_check_phys_apicid_present,
114
115 .phys_pkg_id = noop_phys_pkg_id,
116
117 .get_apic_id = noop_get_apic_id,
118 .set_apic_id = NULL,
119
120 .calc_dest_apicid = apic_flat_calc_apicid,
121
122 .send_IPI = noop_send_IPI,
123 .send_IPI_mask = noop_send_IPI_mask,
124 .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
125 .send_IPI_allbutself = noop_send_IPI_allbutself,
126 .send_IPI_all = noop_send_IPI_all,
127 .send_IPI_self = noop_send_IPI_self,
128
129 .wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
130
131 .inquire_remote_apic = NULL,
132
133 .read = noop_apic_read,
134 .write = noop_apic_write,
135 .eoi_write = noop_apic_write,
136 .icr_read = noop_apic_icr_read,
137 .icr_write = noop_apic_icr_write,
138 .wait_icr_idle = noop_apic_wait_icr_idle,
139 .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
140
141#ifdef CONFIG_X86_32
142 .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid,
143#endif
144};
1/*
2 * NOOP APIC driver.
3 *
4 * Does almost nothing and should be substituted by a real apic driver via
5 * probe routine.
6 *
7 * Though in case if apic is disabled (for some reason) we try
8 * to not uglify the caller's code and allow to call (some) apic routines
9 * like self-ipi, etc...
10 */
11
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/errno.h>
18#include <asm/fixmap.h>
19#include <asm/mpspec.h>
20#include <asm/apicdef.h>
21#include <asm/apic.h>
22#include <asm/setup.h>
23
24#include <linux/smp.h>
25#include <asm/ipi.h>
26
27#include <linux/interrupt.h>
28#include <asm/acpi.h>
29#include <asm/e820.h>
30
31static void noop_init_apic_ldr(void) { }
32static void noop_send_IPI(int cpu, int vector) { }
33static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
34static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
35static void noop_send_IPI_allbutself(int vector) { }
36static void noop_send_IPI_all(int vector) { }
37static void noop_send_IPI_self(int vector) { }
38static void noop_apic_wait_icr_idle(void) { }
39static void noop_apic_icr_write(u32 low, u32 id) { }
40
41static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
42{
43 return -1;
44}
45
46static u32 noop_safe_apic_wait_icr_idle(void)
47{
48 return 0;
49}
50
51static u64 noop_apic_icr_read(void)
52{
53 return 0;
54}
55
56static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
57{
58 return 0;
59}
60
61static unsigned int noop_get_apic_id(unsigned long x)
62{
63 return 0;
64}
65
66static int noop_probe(void)
67{
68 /*
69 * NOOP apic should not ever be
70 * enabled via probe routine
71 */
72 return 0;
73}
74
75static int noop_apic_id_registered(void)
76{
77 /*
78 * if we would be really "pedantic"
79 * we should pass read_apic_id() here
80 * but since NOOP suppose APIC ID = 0
81 * lets save a few cycles
82 */
83 return physid_isset(0, phys_cpu_present_map);
84}
85
86static const struct cpumask *noop_target_cpus(void)
87{
88 /* only BSP here */
89 return cpumask_of(0);
90}
91
92static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask,
93 const struct cpumask *mask)
94{
95 if (cpu != 0)
96 pr_warning("APIC: Vector allocated for non-BSP cpu\n");
97 cpumask_copy(retmask, cpumask_of(cpu));
98}
99
100static u32 noop_apic_read(u32 reg)
101{
102 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
103 return 0;
104}
105
106static void noop_apic_write(u32 reg, u32 v)
107{
108 WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
109}
110
111struct apic apic_noop __ro_after_init = {
112 .name = "noop",
113 .probe = noop_probe,
114 .acpi_madt_oem_check = NULL,
115
116 .apic_id_valid = default_apic_id_valid,
117 .apic_id_registered = noop_apic_id_registered,
118
119 .irq_delivery_mode = dest_LowestPrio,
120 /* logical delivery broadcast to all CPUs: */
121 .irq_dest_mode = 1,
122
123 .target_cpus = noop_target_cpus,
124 .disable_esr = 0,
125 .dest_logical = APIC_DEST_LOGICAL,
126 .check_apicid_used = default_check_apicid_used,
127
128 .vector_allocation_domain = noop_vector_allocation_domain,
129 .init_apic_ldr = noop_init_apic_ldr,
130
131 .ioapic_phys_id_map = default_ioapic_phys_id_map,
132 .setup_apic_routing = NULL,
133
134 .cpu_present_to_apicid = default_cpu_present_to_apicid,
135 .apicid_to_cpu_present = physid_set_mask_of_physid,
136
137 .check_phys_apicid_present = default_check_phys_apicid_present,
138
139 .phys_pkg_id = noop_phys_pkg_id,
140
141 .get_apic_id = noop_get_apic_id,
142 .set_apic_id = NULL,
143
144 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
145
146 .send_IPI = noop_send_IPI,
147 .send_IPI_mask = noop_send_IPI_mask,
148 .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
149 .send_IPI_allbutself = noop_send_IPI_allbutself,
150 .send_IPI_all = noop_send_IPI_all,
151 .send_IPI_self = noop_send_IPI_self,
152
153 .wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
154
155 .inquire_remote_apic = NULL,
156
157 .read = noop_apic_read,
158 .write = noop_apic_write,
159 .eoi_write = noop_apic_write,
160 .icr_read = noop_apic_icr_read,
161 .icr_write = noop_apic_icr_write,
162 .wait_icr_idle = noop_apic_wait_icr_idle,
163 .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
164
165#ifdef CONFIG_X86_32
166 .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid,
167#endif
168};