1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/cpumask.h>
4 #include <linux/acpi.h>
10 static struct apic apic_x2apic_phys;
11 static u32 x2apic_max_apicid __ro_after_init;
13 void __init x2apic_set_max_apicid(u32 apicid)
15 x2apic_max_apicid = apicid;
18 static int __init set_x2apic_phys_mode(char *arg)
23 early_param("x2apic_phys", set_x2apic_phys_mode);
25 static bool x2apic_fadt_phys(void)
28 if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
29 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
30 printk(KERN_DEBUG "System requires x2apic physical mode\n");
37 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
39 return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
42 static void x2apic_send_IPI(int cpu, int vector)
44 u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
46 /* x2apic MSRs are special and need a special fence: */
48 __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
52 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
54 unsigned long query_cpu;
55 unsigned long this_cpu;
58 /* x2apic MSRs are special and need a special fence: */
61 local_irq_save(flags);
63 this_cpu = smp_processor_id();
64 for_each_cpu(query_cpu, mask) {
65 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
67 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
68 vector, APIC_DEST_PHYSICAL);
70 local_irq_restore(flags);
73 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
75 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
79 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
81 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
84 static void x2apic_send_IPI_allbutself(int vector)
86 __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
89 static void x2apic_send_IPI_all(int vector)
91 __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
94 static void init_x2apic_ldr(void)
98 static int x2apic_phys_probe(void)
100 if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
103 return apic == &apic_x2apic_phys;
106 /* Common x2apic functions, also used by x2apic_cluster */
107 int x2apic_apic_id_valid(u32 apicid)
109 if (x2apic_max_apicid && apicid > x2apic_max_apicid)
115 int x2apic_apic_id_registered(void)
120 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
122 unsigned long cfg = __prepare_ICR(0, vector, dest);
123 native_x2apic_icr_write(cfg, apicid);
126 void __x2apic_send_IPI_shorthand(int vector, u32 which)
128 unsigned long cfg = __prepare_ICR(which, vector, 0);
130 /* x2apic MSRs are special and need a special fence: */
132 native_x2apic_icr_write(cfg, 0);
135 unsigned int x2apic_get_apic_id(unsigned long id)
140 u32 x2apic_set_apic_id(unsigned int id)
145 int x2apic_phys_pkg_id(int initial_apicid, int index_msb)
147 return initial_apicid >> index_msb;
150 void x2apic_send_IPI_self(int vector)
152 apic_write(APIC_SELF_IPI, vector);
155 static struct apic apic_x2apic_phys __ro_after_init = {
157 .name = "physical x2apic",
158 .probe = x2apic_phys_probe,
159 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
160 .apic_id_valid = x2apic_apic_id_valid,
161 .apic_id_registered = x2apic_apic_id_registered,
163 .delivery_mode = APIC_DELIVERY_MODE_FIXED,
164 .dest_mode_logical = false,
168 .check_apicid_used = NULL,
169 .init_apic_ldr = init_x2apic_ldr,
170 .ioapic_phys_id_map = NULL,
171 .setup_apic_routing = NULL,
172 .cpu_present_to_apicid = default_cpu_present_to_apicid,
173 .apicid_to_cpu_present = NULL,
174 .check_phys_apicid_present = default_check_phys_apicid_present,
175 .phys_pkg_id = x2apic_phys_pkg_id,
177 .get_apic_id = x2apic_get_apic_id,
178 .set_apic_id = x2apic_set_apic_id,
180 .calc_dest_apicid = apic_default_calc_apicid,
182 .send_IPI = x2apic_send_IPI,
183 .send_IPI_mask = x2apic_send_IPI_mask,
184 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
185 .send_IPI_allbutself = x2apic_send_IPI_allbutself,
186 .send_IPI_all = x2apic_send_IPI_all,
187 .send_IPI_self = x2apic_send_IPI_self,
189 .inquire_remote_apic = NULL,
191 .read = native_apic_msr_read,
192 .write = native_apic_msr_write,
193 .eoi_write = native_apic_msr_eoi_write,
194 .icr_read = native_x2apic_icr_read,
195 .icr_write = native_x2apic_icr_write,
196 .wait_icr_idle = native_x2apic_wait_icr_idle,
197 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle,
200 apic_driver(apic_x2apic_phys);