xref: /openbmc/linux/arch/x86/kernel/apic/ipi.c (revision b3fd7368f8f60bc9a7ffc2a5311db5f4dbd42180)
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  
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  
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  
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  
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   */
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  
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  
129  void default_send_IPI_all(int vector)
130  {
131  	__default_local_send_IPI_all(vector);
132  }
133  
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 */
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  
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