Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / arch / x86 / kernel / genapic_flat_64.c
1 /*
2  * Copyright 2004 James Cleverdon, IBM.
3  * Subject to the GNU Public License, v.2
4  *
5  * Flat APIC subarch code.
6  *
7  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
9  * James Cleverdon.
10  */
11 #include <linux/errno.h>
12 #include <linux/threads.h>
13 #include <linux/cpumask.h>
14 #include <linux/string.h>
15 #include <linux/kernel.h>
16 #include <linux/ctype.h>
17 #include <linux/init.h>
18 #include <asm/smp.h>
19 #include <asm/ipi.h>
20 #include <asm/genapic.h>
21
22 static cpumask_t flat_target_cpus(void)
23 {
24         return cpu_online_map;
25 }
26
27 static cpumask_t flat_vector_allocation_domain(int cpu)
28 {
29         /* Careful. Some cpus do not strictly honor the set of cpus
30          * specified in the interrupt destination when using lowest
31          * priority interrupt delivery mode.
32          *
33          * In particular there was a hyperthreading cpu observed to
34          * deliver interrupts to the wrong hyperthread when only one
35          * hyperthread was specified in the interrupt desitination.
36          */
37         cpumask_t domain = { { [0] = APIC_ALL_CPUS, } };
38         return domain;
39 }
40
41 /*
42  * Set up the logical destination ID.
43  *
44  * Intel recommends to set DFR, LDR and TPR before enabling
45  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
46  * document number 292116).  So here it goes...
47  */
48 static void flat_init_apic_ldr(void)
49 {
50         unsigned long val;
51         unsigned long num, id;
52
53         num = smp_processor_id();
54         id = 1UL << num;
55         apic_write(APIC_DFR, APIC_DFR_FLAT);
56         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
57         val |= SET_APIC_LOGICAL_ID(id);
58         apic_write(APIC_LDR, val);
59 }
60
61 static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
62 {
63         unsigned long mask = cpus_addr(cpumask)[0];
64         unsigned long flags;
65
66         local_irq_save(flags);
67         __send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL);
68         local_irq_restore(flags);
69 }
70
71 static void flat_send_IPI_allbutself(int vector)
72 {
73 #ifdef  CONFIG_HOTPLUG_CPU
74         int hotplug = 1;
75 #else
76         int hotplug = 0;
77 #endif
78         if (hotplug || vector == NMI_VECTOR) {
79                 cpumask_t allbutme = cpu_online_map;
80
81                 cpu_clear(smp_processor_id(), allbutme);
82
83                 if (!cpus_empty(allbutme))
84                         flat_send_IPI_mask(allbutme, vector);
85         } else if (num_online_cpus() > 1) {
86                 __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
87         }
88 }
89
90 static void flat_send_IPI_all(int vector)
91 {
92         if (vector == NMI_VECTOR)
93                 flat_send_IPI_mask(cpu_online_map, vector);
94         else
95                 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
96 }
97
98 static int flat_apic_id_registered(void)
99 {
100         return physid_isset(GET_APIC_ID(read_apic_id()), phys_cpu_present_map);
101 }
102
103 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
104 {
105         return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
106 }
107
108 static unsigned int phys_pkg_id(int index_msb)
109 {
110         return hard_smp_processor_id() >> index_msb;
111 }
112
113 struct genapic apic_flat =  {
114         .name = "flat",
115         .int_delivery_mode = dest_LowestPrio,
116         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
117         .target_cpus = flat_target_cpus,
118         .vector_allocation_domain = flat_vector_allocation_domain,
119         .apic_id_registered = flat_apic_id_registered,
120         .init_apic_ldr = flat_init_apic_ldr,
121         .send_IPI_all = flat_send_IPI_all,
122         .send_IPI_allbutself = flat_send_IPI_allbutself,
123         .send_IPI_mask = flat_send_IPI_mask,
124         .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
125         .phys_pkg_id = phys_pkg_id,
126 };
127
128 /*
129  * Physflat mode is used when there are more than 8 CPUs on a AMD system.
130  * We cannot use logical delivery in this case because the mask
131  * overflows, so use physical mode.
132  */
133
134 static cpumask_t physflat_target_cpus(void)
135 {
136         return cpu_online_map;
137 }
138
139 static cpumask_t physflat_vector_allocation_domain(int cpu)
140 {
141         return cpumask_of_cpu(cpu);
142 }
143
144 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
145 {
146         send_IPI_mask_sequence(cpumask, vector);
147 }
148
149 static void physflat_send_IPI_allbutself(int vector)
150 {
151         cpumask_t allbutme = cpu_online_map;
152
153         cpu_clear(smp_processor_id(), allbutme);
154         physflat_send_IPI_mask(allbutme, vector);
155 }
156
157 static void physflat_send_IPI_all(int vector)
158 {
159         physflat_send_IPI_mask(cpu_online_map, vector);
160 }
161
162 static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
163 {
164         int cpu;
165
166         /*
167          * We're using fixed IRQ delivery, can only return one phys APIC ID.
168          * May as well be the first.
169          */
170         cpu = first_cpu(cpumask);
171         if ((unsigned)cpu < nr_cpu_ids)
172                 return per_cpu(x86_cpu_to_apicid, cpu);
173         else
174                 return BAD_APICID;
175 }
176
177 struct genapic apic_physflat =  {
178         .name = "physical flat",
179         .int_delivery_mode = dest_Fixed,
180         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
181         .target_cpus = physflat_target_cpus,
182         .vector_allocation_domain = physflat_vector_allocation_domain,
183         .apic_id_registered = flat_apic_id_registered,
184         .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
185         .send_IPI_all = physflat_send_IPI_all,
186         .send_IPI_allbutself = physflat_send_IPI_allbutself,
187         .send_IPI_mask = physflat_send_IPI_mask,
188         .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
189         .phys_pkg_id = phys_pkg_id,
190 };