1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/threads.h>
3 #include <linux/cpumask.h>
4 #include <linux/string.h>
5 #include <linux/kernel.h>
6 #include <linux/ctype.h>
7 #include <linux/dmar.h>
8
9 #include <asm/smp.h>
10 #include <asm/x2apic.h>
11
12 int x2apic_phys;
13
14 static struct apic apic_x2apic_phys;
15
set_x2apic_phys_mode(char * arg)16 static int set_x2apic_phys_mode(char *arg)
17 {
18 x2apic_phys = 1;
19 return 0;
20 }
21 early_param("x2apic_phys", set_x2apic_phys_mode);
22
x2apic_fadt_phys(void)23 static bool x2apic_fadt_phys(void)
24 {
25 #ifdef CONFIG_ACPI
26 if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
27 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
28 printk(KERN_DEBUG "System requires x2apic physical mode\n");
29 return true;
30 }
31 #endif
32 return false;
33 }
34
x2apic_acpi_madt_oem_check(char * oem_id,char * oem_table_id)35 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
36 {
37 return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
38 }
39
x2apic_send_IPI(int cpu,int vector)40 static void x2apic_send_IPI(int cpu, int vector)
41 {
42 u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
43
44 x2apic_wrmsr_fence();
45 __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
46 }
47
48 static void
__x2apic_send_IPI_mask(const struct cpumask * mask,int vector,int apic_dest)49 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
50 {
51 unsigned long query_cpu;
52 unsigned long this_cpu;
53 unsigned long flags;
54
55 x2apic_wrmsr_fence();
56
57 local_irq_save(flags);
58
59 this_cpu = smp_processor_id();
60 for_each_cpu(query_cpu, mask) {
61 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
62 continue;
63 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
64 vector, APIC_DEST_PHYSICAL);
65 }
66 local_irq_restore(flags);
67 }
68
x2apic_send_IPI_mask(const struct cpumask * mask,int vector)69 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
70 {
71 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
72 }
73
74 static void
x2apic_send_IPI_mask_allbutself(const struct cpumask * mask,int vector)75 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
76 {
77 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
78 }
79
x2apic_send_IPI_allbutself(int vector)80 static void x2apic_send_IPI_allbutself(int vector)
81 {
82 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
83 }
84
x2apic_send_IPI_all(int vector)85 static void x2apic_send_IPI_all(int vector)
86 {
87 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
88 }
89
init_x2apic_ldr(void)90 static void init_x2apic_ldr(void)
91 {
92 }
93
x2apic_phys_probe(void)94 static int x2apic_phys_probe(void)
95 {
96 if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
97 return 1;
98
99 return apic == &apic_x2apic_phys;
100 }
101
102 static struct apic apic_x2apic_phys __ro_after_init = {
103
104 .name = "physical x2apic",
105 .probe = x2apic_phys_probe,
106 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
107 .apic_id_valid = x2apic_apic_id_valid,
108 .apic_id_registered = x2apic_apic_id_registered,
109
110 .irq_delivery_mode = dest_Fixed,
111 .irq_dest_mode = 0, /* physical */
112
113 .target_cpus = online_target_cpus,
114 .disable_esr = 0,
115 .dest_logical = 0,
116 .check_apicid_used = NULL,
117
118 .vector_allocation_domain = default_vector_allocation_domain,
119 .init_apic_ldr = init_x2apic_ldr,
120
121 .ioapic_phys_id_map = NULL,
122 .setup_apic_routing = NULL,
123 .cpu_present_to_apicid = default_cpu_present_to_apicid,
124 .apicid_to_cpu_present = NULL,
125 .check_phys_apicid_present = default_check_phys_apicid_present,
126 .phys_pkg_id = x2apic_phys_pkg_id,
127
128 .get_apic_id = x2apic_get_apic_id,
129 .set_apic_id = x2apic_set_apic_id,
130
131 .cpu_mask_to_apicid = default_cpu_mask_to_apicid,
132
133 .send_IPI = x2apic_send_IPI,
134 .send_IPI_mask = x2apic_send_IPI_mask,
135 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
136 .send_IPI_allbutself = x2apic_send_IPI_allbutself,
137 .send_IPI_all = x2apic_send_IPI_all,
138 .send_IPI_self = x2apic_send_IPI_self,
139
140 .inquire_remote_apic = NULL,
141
142 .read = native_apic_msr_read,
143 .write = native_apic_msr_write,
144 .eoi_write = native_apic_msr_eoi_write,
145 .icr_read = native_x2apic_icr_read,
146 .icr_write = native_x2apic_icr_write,
147 .wait_icr_idle = native_x2apic_wait_icr_idle,
148 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle,
149 };
150
151 apic_driver(apic_x2apic_phys);
152