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