1 #include <linux/threads.h>
2 #include <linux/cpumask.h>
3 #include <linux/string.h>
4 #include <linux/kernel.h>
5 #include <linux/ctype.h>
6 #include <linux/init.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 if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
26 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
27 printk(KERN_DEBUG "System requires x2apic physical mode\n");
28 return true;
29 }
30 return false;
31 }
32
x2apic_acpi_madt_oem_check(char * oem_id,char * oem_table_id)33 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
34 {
35 return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
36 }
37
38 static void
__x2apic_send_IPI_mask(const struct cpumask * mask,int vector,int apic_dest)39 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
40 {
41 unsigned long query_cpu;
42 unsigned long this_cpu;
43 unsigned long flags;
44
45 x2apic_wrmsr_fence();
46
47 local_irq_save(flags);
48
49 this_cpu = smp_processor_id();
50 for_each_cpu(query_cpu, mask) {
51 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
52 continue;
53 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
54 vector, APIC_DEST_PHYSICAL);
55 }
56 local_irq_restore(flags);
57 }
58
x2apic_send_IPI_mask(const struct cpumask * mask,int vector)59 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
60 {
61 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
62 }
63
64 static void
x2apic_send_IPI_mask_allbutself(const struct cpumask * mask,int vector)65 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
66 {
67 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
68 }
69
x2apic_send_IPI_allbutself(int vector)70 static void x2apic_send_IPI_allbutself(int vector)
71 {
72 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
73 }
74
x2apic_send_IPI_all(int vector)75 static void x2apic_send_IPI_all(int vector)
76 {
77 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
78 }
79
x2apic_cpu_mask_to_apicid(const struct cpumask * cpumask)80 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
81 {
82 /*
83 * We're using fixed IRQ delivery, can only return one phys APIC ID.
84 * May as well be the first.
85 */
86 int cpu = cpumask_first(cpumask);
87
88 if ((unsigned)cpu < nr_cpu_ids)
89 return per_cpu(x86_cpu_to_apicid, cpu);
90 else
91 return BAD_APICID;
92 }
93
94 static unsigned int
x2apic_cpu_mask_to_apicid_and(const struct cpumask * cpumask,const struct cpumask * andmask)95 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
96 const struct cpumask *andmask)
97 {
98 int cpu;
99
100 /*
101 * We're using fixed IRQ delivery, can only return one phys APIC ID.
102 * May as well be the first.
103 */
104 for_each_cpu_and(cpu, cpumask, andmask) {
105 if (cpumask_test_cpu(cpu, cpu_online_mask))
106 break;
107 }
108
109 return per_cpu(x86_cpu_to_apicid, cpu);
110 }
111
init_x2apic_ldr(void)112 static void init_x2apic_ldr(void)
113 {
114 }
115
x2apic_phys_probe(void)116 static int x2apic_phys_probe(void)
117 {
118 if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
119 return 1;
120
121 return apic == &apic_x2apic_phys;
122 }
123
124 static struct apic apic_x2apic_phys = {
125
126 .name = "physical x2apic",
127 .probe = x2apic_phys_probe,
128 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
129 .apic_id_valid = x2apic_apic_id_valid,
130 .apic_id_registered = x2apic_apic_id_registered,
131
132 .irq_delivery_mode = dest_Fixed,
133 .irq_dest_mode = 0, /* physical */
134
135 .target_cpus = x2apic_target_cpus,
136 .disable_esr = 0,
137 .dest_logical = 0,
138 .check_apicid_used = NULL,
139 .check_apicid_present = NULL,
140
141 .vector_allocation_domain = x2apic_vector_allocation_domain,
142 .init_apic_ldr = init_x2apic_ldr,
143
144 .ioapic_phys_id_map = NULL,
145 .setup_apic_routing = NULL,
146 .multi_timer_check = NULL,
147 .cpu_present_to_apicid = default_cpu_present_to_apicid,
148 .apicid_to_cpu_present = NULL,
149 .setup_portio_remap = NULL,
150 .check_phys_apicid_present = default_check_phys_apicid_present,
151 .enable_apic_mode = NULL,
152 .phys_pkg_id = x2apic_phys_pkg_id,
153 .mps_oem_check = NULL,
154
155 .get_apic_id = x2apic_get_apic_id,
156 .set_apic_id = x2apic_set_apic_id,
157 .apic_id_mask = 0xFFFFFFFFu,
158
159 .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
160 .cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,
161
162 .send_IPI_mask = x2apic_send_IPI_mask,
163 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
164 .send_IPI_allbutself = x2apic_send_IPI_allbutself,
165 .send_IPI_all = x2apic_send_IPI_all,
166 .send_IPI_self = x2apic_send_IPI_self,
167
168 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
169 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
170 .wait_for_init_deassert = NULL,
171 .smp_callin_clear_local_apic = NULL,
172 .inquire_remote_apic = NULL,
173
174 .read = native_apic_msr_read,
175 .write = native_apic_msr_write,
176 .icr_read = native_x2apic_icr_read,
177 .icr_write = native_x2apic_icr_write,
178 .wait_icr_idle = native_x2apic_wait_icr_idle,
179 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle,
180 };
181
182 apic_driver(apic_x2apic_phys);
183