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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/ipi.h>
11 #include <asm/genapic.h>
12 
13 static int x2apic_phys;
14 
set_x2apic_phys_mode(char * arg)15 static int set_x2apic_phys_mode(char *arg)
16 {
17 	x2apic_phys = 1;
18 	return 0;
19 }
20 early_param("x2apic_phys", set_x2apic_phys_mode);
21 
x2apic_acpi_madt_oem_check(char * oem_id,char * oem_table_id)22 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
23 {
24 	if (cpu_has_x2apic && x2apic_phys)
25 		return 1;
26 
27 	return 0;
28 }
29 
30 /* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
31 
x2apic_target_cpus(void)32 static const struct cpumask *x2apic_target_cpus(void)
33 {
34 	return cpumask_of(0);
35 }
36 
x2apic_vector_allocation_domain(int cpu,struct cpumask * retmask)37 static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
38 {
39 	cpumask_clear(retmask);
40 	cpumask_set_cpu(cpu, retmask);
41 }
42 
__x2apic_send_IPI_dest(unsigned int apicid,int vector,unsigned int dest)43 static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
44 				   unsigned int dest)
45 {
46 	unsigned long cfg;
47 
48 	cfg = __prepare_ICR(0, vector, dest);
49 
50 	/*
51 	 * send the IPI.
52 	 */
53 	x2apic_icr_write(cfg, apicid);
54 }
55 
x2apic_send_IPI_mask(const struct cpumask * mask,int vector)56 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
57 {
58 	unsigned long flags;
59 	unsigned long query_cpu;
60 
61 	local_irq_save(flags);
62 	for_each_cpu(query_cpu, mask) {
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_allbutself(const struct cpumask * mask,int vector)69 static void x2apic_send_IPI_mask_allbutself(const struct cpumask *mask,
70 					    int vector)
71 {
72 	unsigned long flags;
73 	unsigned long query_cpu;
74 	unsigned long this_cpu = smp_processor_id();
75 
76 	local_irq_save(flags);
77 	for_each_cpu(query_cpu, mask) {
78 		if (query_cpu != this_cpu)
79 			__x2apic_send_IPI_dest(
80 				per_cpu(x86_cpu_to_apicid, query_cpu),
81 				vector, APIC_DEST_PHYSICAL);
82 	}
83 	local_irq_restore(flags);
84 }
85 
x2apic_send_IPI_allbutself(int vector)86 static void x2apic_send_IPI_allbutself(int vector)
87 {
88 	unsigned long flags;
89 	unsigned long query_cpu;
90 	unsigned long this_cpu = smp_processor_id();
91 
92 	local_irq_save(flags);
93 	for_each_online_cpu(query_cpu)
94 		if (query_cpu != this_cpu)
95 			__x2apic_send_IPI_dest(
96 				per_cpu(x86_cpu_to_apicid, query_cpu),
97 				vector, APIC_DEST_PHYSICAL);
98 	local_irq_restore(flags);
99 }
100 
x2apic_send_IPI_all(int vector)101 static void x2apic_send_IPI_all(int vector)
102 {
103 	x2apic_send_IPI_mask(cpu_online_mask, vector);
104 }
105 
x2apic_apic_id_registered(void)106 static int x2apic_apic_id_registered(void)
107 {
108 	return 1;
109 }
110 
x2apic_cpu_mask_to_apicid(const struct cpumask * cpumask)111 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
112 {
113 	int cpu;
114 
115 	/*
116 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
117 	 * May as well be the first.
118 	 */
119 	cpu = cpumask_first(cpumask);
120 	if ((unsigned)cpu < nr_cpu_ids)
121 		return per_cpu(x86_cpu_to_apicid, cpu);
122 	else
123 		return BAD_APICID;
124 }
125 
x2apic_cpu_mask_to_apicid_and(const struct cpumask * cpumask,const struct cpumask * andmask)126 static unsigned int x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
127 						  const struct cpumask *andmask)
128 {
129 	int cpu;
130 
131 	/*
132 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
133 	 * May as well be the first.
134 	 */
135 	for_each_cpu_and(cpu, cpumask, andmask)
136 		if (cpumask_test_cpu(cpu, cpu_online_mask))
137 			break;
138 	if (cpu < nr_cpu_ids)
139 		return per_cpu(x86_cpu_to_apicid, cpu);
140 	return BAD_APICID;
141 }
142 
get_apic_id(unsigned long x)143 static unsigned int get_apic_id(unsigned long x)
144 {
145 	unsigned int id;
146 
147 	id = x;
148 	return id;
149 }
150 
set_apic_id(unsigned int id)151 static unsigned long set_apic_id(unsigned int id)
152 {
153 	unsigned long x;
154 
155 	x = id;
156 	return x;
157 }
158 
phys_pkg_id(int index_msb)159 static unsigned int phys_pkg_id(int index_msb)
160 {
161 	return current_cpu_data.initial_apicid >> index_msb;
162 }
163 
x2apic_send_IPI_self(int vector)164 static void x2apic_send_IPI_self(int vector)
165 {
166 	apic_write(APIC_SELF_IPI, vector);
167 }
168 
init_x2apic_ldr(void)169 static void init_x2apic_ldr(void)
170 {
171 	return;
172 }
173 
174 struct genapic apic_x2apic_phys = {
175 	.name = "physical x2apic",
176 	.acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
177 	.int_delivery_mode = dest_Fixed,
178 	.int_dest_mode = (APIC_DEST_PHYSICAL != 0),
179 	.target_cpus = x2apic_target_cpus,
180 	.vector_allocation_domain = x2apic_vector_allocation_domain,
181 	.apic_id_registered = x2apic_apic_id_registered,
182 	.init_apic_ldr = init_x2apic_ldr,
183 	.send_IPI_all = x2apic_send_IPI_all,
184 	.send_IPI_allbutself = x2apic_send_IPI_allbutself,
185 	.send_IPI_mask = x2apic_send_IPI_mask,
186 	.send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
187 	.send_IPI_self = x2apic_send_IPI_self,
188 	.cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
189 	.cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,
190 	.phys_pkg_id = phys_pkg_id,
191 	.get_apic_id = get_apic_id,
192 	.set_apic_id = set_apic_id,
193 	.apic_id_mask = (0xFFFFFFFFu),
194 };
195