1 // SPDX-License-Identifier: GPL-2.0-only
2 #define pr_fmt(fmt) "APIC: " fmt
3
4 #include <asm/apic.h>
5
6 #include "local.h"
7
8 /*
9 * Use DEFINE_STATIC_CALL_NULL() to avoid having to provide stub functions
10 * for each callback. The callbacks are setup during boot and all except
11 * wait_icr_idle() must be initialized before usage. The IPI wrappers
12 * use static_call() and not static_call_cond() to catch any fails.
13 */
14 #define DEFINE_APIC_CALL(__cb) \
15 DEFINE_STATIC_CALL_NULL(apic_call_##__cb, *apic->__cb)
16
17 DEFINE_APIC_CALL(eoi);
18 DEFINE_APIC_CALL(native_eoi);
19 DEFINE_APIC_CALL(icr_read);
20 DEFINE_APIC_CALL(icr_write);
21 DEFINE_APIC_CALL(read);
22 DEFINE_APIC_CALL(send_IPI);
23 DEFINE_APIC_CALL(send_IPI_mask);
24 DEFINE_APIC_CALL(send_IPI_mask_allbutself);
25 DEFINE_APIC_CALL(send_IPI_allbutself);
26 DEFINE_APIC_CALL(send_IPI_all);
27 DEFINE_APIC_CALL(send_IPI_self);
28 DEFINE_APIC_CALL(wait_icr_idle);
29 DEFINE_APIC_CALL(wakeup_secondary_cpu);
30 DEFINE_APIC_CALL(wakeup_secondary_cpu_64);
31 DEFINE_APIC_CALL(write);
32
33 EXPORT_STATIC_CALL_TRAMP_GPL(apic_call_send_IPI_mask);
34 EXPORT_STATIC_CALL_TRAMP_GPL(apic_call_send_IPI_self);
35
36 /* The container for function call overrides */
37 struct apic_override __x86_apic_override __initdata;
38
39 #define apply_override(__cb) \
40 if (__x86_apic_override.__cb) \
41 apic->__cb = __x86_apic_override.__cb
42
43 static __init void restore_override_callbacks(void)
44 {
45 apply_override(eoi);
46 apply_override(native_eoi);
47 apply_override(write);
48 apply_override(read);
49 apply_override(send_IPI);
50 apply_override(send_IPI_mask);
51 apply_override(send_IPI_mask_allbutself);
52 apply_override(send_IPI_allbutself);
53 apply_override(send_IPI_all);
54 apply_override(send_IPI_self);
55 apply_override(icr_read);
56 apply_override(icr_write);
57 apply_override(wakeup_secondary_cpu);
58 apply_override(wakeup_secondary_cpu_64);
59 }
60
61 #define update_call(__cb) \
62 static_call_update(apic_call_##__cb, *apic->__cb)
63
64 static __init void update_static_calls(void)
65 {
66 update_call(eoi);
67 update_call(native_eoi);
68 update_call(write);
69 update_call(read);
70 update_call(send_IPI);
71 update_call(send_IPI_mask);
72 update_call(send_IPI_mask_allbutself);
73 update_call(send_IPI_allbutself);
74 update_call(send_IPI_all);
75 update_call(send_IPI_self);
76 update_call(icr_read);
77 update_call(icr_write);
78 update_call(wait_icr_idle);
79 update_call(wakeup_secondary_cpu);
80 update_call(wakeup_secondary_cpu_64);
81 }
82
83 void __init apic_setup_apic_calls(void)
84 {
85 /* Ensure that the default APIC has native_eoi populated */
86 apic->native_eoi = apic->eoi;
87 update_static_calls();
88 pr_info("Static calls initialized\n");
89 }
90
91 void __init apic_install_driver(struct apic *driver)
92 {
93 if (apic == driver)
94 return;
95
96 apic = driver;
97
98 if (IS_ENABLED(CONFIG_X86_X2APIC) && apic->x2apic_set_max_apicid)
99 apic->max_apic_id = x2apic_max_apicid;
100
101 /* Copy the original eoi() callback as KVM/HyperV might overwrite it */
102 if (!apic->native_eoi)
103 apic->native_eoi = apic->eoi;
104
105 /* Apply any already installed callback overrides */
106 restore_override_callbacks();
107 update_static_calls();
108
109 pr_info("Switched APIC routing to: %s\n", driver->name);
110 }
111
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