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1 #include <linux/cpumask.h>
2 #include <linux/interrupt.h>
3 
4 #include <linux/mm.h>
5 #include <linux/delay.h>
6 #include <linux/spinlock.h>
7 #include <linux/kernel_stat.h>
8 #include <linux/mc146818rtc.h>
9 #include <linux/cache.h>
10 #include <linux/cpu.h>
11 #include <linux/module.h>
12 
13 #include <asm/smp.h>
14 #include <asm/mtrr.h>
15 #include <asm/tlbflush.h>
16 #include <asm/mmu_context.h>
17 #include <asm/apic.h>
18 #include <asm/proto.h>
19 #include <asm/ipi.h>
20 
default_send_IPI_mask_sequence_phys(const struct cpumask * mask,int vector)21 void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
22 {
23 	unsigned long query_cpu;
24 	unsigned long flags;
25 
26 	/*
27 	 * Hack. The clustered APIC addressing mode doesn't allow us to send
28 	 * to an arbitrary mask, so I do a unicast to each CPU instead.
29 	 * - mbligh
30 	 */
31 	local_irq_save(flags);
32 	for_each_cpu(query_cpu, mask) {
33 		__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
34 				query_cpu), vector, APIC_DEST_PHYSICAL);
35 	}
36 	local_irq_restore(flags);
37 }
38 
default_send_IPI_mask_allbutself_phys(const struct cpumask * mask,int vector)39 void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
40 						 int vector)
41 {
42 	unsigned int this_cpu = smp_processor_id();
43 	unsigned int query_cpu;
44 	unsigned long flags;
45 
46 	/* See Hack comment above */
47 
48 	local_irq_save(flags);
49 	for_each_cpu(query_cpu, mask) {
50 		if (query_cpu == this_cpu)
51 			continue;
52 		__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
53 				 query_cpu), vector, APIC_DEST_PHYSICAL);
54 	}
55 	local_irq_restore(flags);
56 }
57 
58 #ifdef CONFIG_X86_32
59 
default_send_IPI_mask_sequence_logical(const struct cpumask * mask,int vector)60 void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
61 						 int vector)
62 {
63 	unsigned long flags;
64 	unsigned int query_cpu;
65 
66 	/*
67 	 * Hack. The clustered APIC addressing mode doesn't allow us to send
68 	 * to an arbitrary mask, so I do a unicasts to each CPU instead. This
69 	 * should be modified to do 1 message per cluster ID - mbligh
70 	 */
71 
72 	local_irq_save(flags);
73 	for_each_cpu(query_cpu, mask)
74 		__default_send_IPI_dest_field(
75 			early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
76 			vector, apic->dest_logical);
77 	local_irq_restore(flags);
78 }
79 
default_send_IPI_mask_allbutself_logical(const struct cpumask * mask,int vector)80 void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
81 						 int vector)
82 {
83 	unsigned long flags;
84 	unsigned int query_cpu;
85 	unsigned int this_cpu = smp_processor_id();
86 
87 	/* See Hack comment above */
88 
89 	local_irq_save(flags);
90 	for_each_cpu(query_cpu, mask) {
91 		if (query_cpu == this_cpu)
92 			continue;
93 		__default_send_IPI_dest_field(
94 			early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
95 			vector, apic->dest_logical);
96 		}
97 	local_irq_restore(flags);
98 }
99 
100 /*
101  * This is only used on smaller machines.
102  */
default_send_IPI_mask_logical(const struct cpumask * cpumask,int vector)103 void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
104 {
105 	unsigned long mask = cpumask_bits(cpumask)[0];
106 	unsigned long flags;
107 
108 	if (!mask)
109 		return;
110 
111 	local_irq_save(flags);
112 	WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
113 	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
114 	local_irq_restore(flags);
115 }
116 
default_send_IPI_allbutself(int vector)117 void default_send_IPI_allbutself(int vector)
118 {
119 	/*
120 	 * if there are no other CPUs in the system then we get an APIC send
121 	 * error if we try to broadcast, thus avoid sending IPIs in this case.
122 	 */
123 	if (!(num_online_cpus() > 1))
124 		return;
125 
126 	__default_local_send_IPI_allbutself(vector);
127 }
128 
default_send_IPI_all(int vector)129 void default_send_IPI_all(int vector)
130 {
131 	__default_local_send_IPI_all(vector);
132 }
133 
default_send_IPI_self(int vector)134 void default_send_IPI_self(int vector)
135 {
136 	__default_send_IPI_shortcut(APIC_DEST_SELF, vector, apic->dest_logical);
137 }
138 
139 /* must come after the send_IPI functions above for inlining */
convert_apicid_to_cpu(int apic_id)140 static int convert_apicid_to_cpu(int apic_id)
141 {
142 	int i;
143 
144 	for_each_possible_cpu(i) {
145 		if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
146 			return i;
147 	}
148 	return -1;
149 }
150 
safe_smp_processor_id(void)151 int safe_smp_processor_id(void)
152 {
153 	int apicid, cpuid;
154 
155 	if (!cpu_has_apic)
156 		return 0;
157 
158 	apicid = hard_smp_processor_id();
159 	if (apicid == BAD_APICID)
160 		return 0;
161 
162 	cpuid = convert_apicid_to_cpu(apicid);
163 
164 	return cpuid >= 0 ? cpuid : 0;
165 }
166 #endif
167