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#ifdef CONFIG_ACPI
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#endif
31	return false;
32}
33
34static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
35{
36	return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
37}
38
39static void
40__x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
41{
42	unsigned long query_cpu;
43	unsigned long this_cpu;
44	unsigned long flags;
45
46	x2apic_wrmsr_fence();
47
48	local_irq_save(flags);
49
50	this_cpu = smp_processor_id();
51	for_each_cpu(query_cpu, mask) {
52		if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
53			continue;
54		__x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
55				       vector, APIC_DEST_PHYSICAL);
56	}
57	local_irq_restore(flags);
58}
59
60static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
61{
62	__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
63}
64
65static void
66 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
67{
68	__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
69}
70
71static void x2apic_send_IPI_allbutself(int vector)
72{
73	__x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
74}
75
76static void x2apic_send_IPI_all(int vector)
77{
78	__x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
79}
80
81static void init_x2apic_ldr(void)
82{
83}
84
85static int x2apic_phys_probe(void)
86{
87	if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
88		return 1;
89
90	return apic == &apic_x2apic_phys;
91}
92
93static struct apic apic_x2apic_phys = {
94
95	.name				= "physical x2apic",
96	.probe				= x2apic_phys_probe,
97	.acpi_madt_oem_check		= x2apic_acpi_madt_oem_check,
98	.apic_id_valid			= x2apic_apic_id_valid,
99	.apic_id_registered		= x2apic_apic_id_registered,
100
101	.irq_delivery_mode		= dest_Fixed,
102	.irq_dest_mode			= 0, /* physical */
103
104	.target_cpus			= online_target_cpus,
105	.disable_esr			= 0,
106	.dest_logical			= 0,
107	.check_apicid_used		= NULL,
108
109	.vector_allocation_domain	= default_vector_allocation_domain,
110	.init_apic_ldr			= init_x2apic_ldr,
111
112	.ioapic_phys_id_map		= NULL,
113	.setup_apic_routing		= NULL,
114	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
115	.apicid_to_cpu_present		= NULL,
116	.check_phys_apicid_present	= default_check_phys_apicid_present,
117	.phys_pkg_id			= x2apic_phys_pkg_id,
118
119	.get_apic_id			= x2apic_get_apic_id,
120	.set_apic_id			= x2apic_set_apic_id,
121	.apic_id_mask			= 0xFFFFFFFFu,
122
123	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
124
125	.send_IPI_mask			= x2apic_send_IPI_mask,
126	.send_IPI_mask_allbutself	= x2apic_send_IPI_mask_allbutself,
127	.send_IPI_allbutself		= x2apic_send_IPI_allbutself,
128	.send_IPI_all			= x2apic_send_IPI_all,
129	.send_IPI_self			= x2apic_send_IPI_self,
130
131	.inquire_remote_apic		= NULL,
132
133	.read				= native_apic_msr_read,
134	.write				= native_apic_msr_write,
135	.eoi_write			= native_apic_msr_eoi_write,
136	.icr_read			= native_x2apic_icr_read,
137	.icr_write			= native_x2apic_icr_write,
138	.wait_icr_idle			= native_x2apic_wait_icr_idle,
139	.safe_wait_icr_idle		= native_safe_x2apic_wait_icr_idle,
140};
141
142apic_driver(apic_x2apic_phys);
143