Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6] / arch / x86 / kernel / genx2apic_cluster.c
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 DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
14
15 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
16 {
17         if (cpu_has_x2apic)
18                 return 1;
19
20         return 0;
21 }
22
23 /* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
24
25 static cpumask_t x2apic_target_cpus(void)
26 {
27         return cpumask_of_cpu(0);
28 }
29
30 /*
31  * for now each logical cpu is in its own vector allocation domain.
32  */
33 static cpumask_t x2apic_vector_allocation_domain(int cpu)
34 {
35         cpumask_t domain = CPU_MASK_NONE;
36         cpu_set(cpu, domain);
37         return domain;
38 }
39
40 static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
41                                    unsigned int dest)
42 {
43         unsigned long cfg;
44
45         cfg = __prepare_ICR(0, vector, dest);
46
47         /*
48          * send the IPI.
49          */
50         x2apic_icr_write(cfg, apicid);
51 }
52
53 /*
54  * for now, we send the IPI's one by one in the cpumask.
55  * TBD: Based on the cpu mask, we can send the IPI's to the cluster group
56  * at once. We have 16 cpu's in a cluster. This will minimize IPI register
57  * writes.
58  */
59 static void x2apic_send_IPI_mask(cpumask_t mask, int vector)
60 {
61         unsigned long flags;
62         unsigned long query_cpu;
63
64         local_irq_save(flags);
65         for_each_cpu_mask(query_cpu, mask) {
66                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_logical_apicid, query_cpu),
67                                        vector, APIC_DEST_LOGICAL);
68         }
69         local_irq_restore(flags);
70 }
71
72 static void x2apic_send_IPI_allbutself(int vector)
73 {
74         cpumask_t mask = cpu_online_map;
75
76         cpu_clear(smp_processor_id(), mask);
77
78         if (!cpus_empty(mask))
79                 x2apic_send_IPI_mask(mask, vector);
80 }
81
82 static void x2apic_send_IPI_all(int vector)
83 {
84         x2apic_send_IPI_mask(cpu_online_map, vector);
85 }
86
87 static int x2apic_apic_id_registered(void)
88 {
89         return 1;
90 }
91
92 static unsigned int x2apic_cpu_mask_to_apicid(cpumask_t cpumask)
93 {
94         int cpu;
95
96         /*
97          * We're using fixed IRQ delivery, can only return one phys APIC ID.
98          * May as well be the first.
99          */
100         cpu = first_cpu(cpumask);
101         if ((unsigned)cpu < NR_CPUS)
102                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
103         else
104                 return BAD_APICID;
105 }
106
107 static unsigned int get_apic_id(unsigned long x)
108 {
109         unsigned int id;
110
111         id = x;
112         return id;
113 }
114
115 static unsigned long set_apic_id(unsigned int id)
116 {
117         unsigned long x;
118
119         x = id;
120         return x;
121 }
122
123 static unsigned int phys_pkg_id(int index_msb)
124 {
125         return current_cpu_data.initial_apicid >> index_msb;
126 }
127
128 static void x2apic_send_IPI_self(int vector)
129 {
130         apic_write(APIC_SELF_IPI, vector);
131 }
132
133 static void init_x2apic_ldr(void)
134 {
135         int cpu = smp_processor_id();
136
137         per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
138         return;
139 }
140
141 struct genapic apic_x2apic_cluster = {
142         .name = "cluster x2apic",
143         .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
144         .int_delivery_mode = dest_LowestPrio,
145         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
146         .target_cpus = x2apic_target_cpus,
147         .vector_allocation_domain = x2apic_vector_allocation_domain,
148         .apic_id_registered = x2apic_apic_id_registered,
149         .init_apic_ldr = init_x2apic_ldr,
150         .send_IPI_all = x2apic_send_IPI_all,
151         .send_IPI_allbutself = x2apic_send_IPI_allbutself,
152         .send_IPI_mask = x2apic_send_IPI_mask,
153         .send_IPI_self = x2apic_send_IPI_self,
154         .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
155         .phys_pkg_id = phys_pkg_id,
156         .get_apic_id = get_apic_id,
157         .set_apic_id = set_apic_id,
158         .apic_id_mask = (0xFFFFFFFFu),
159 };