fedora core 6 1.2949 + vserver 2.2.0
[linux-2.6.git] / arch / x86_64 / kernel / genapic_flat.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/threads.h>
12 #include <linux/cpumask.h>
13 #include <linux/string.h>
14 #include <linux/kernel.h>
15 #include <linux/ctype.h>
16 #include <linux/init.h>
17 #include <asm/smp.h>
18 #include <asm/ipi.h>
19
20 static cpumask_t flat_target_cpus(void)
21 {
22         return cpu_online_map;
23 }
24
25 static cpumask_t flat_vector_allocation_domain(int cpu)
26 {
27         /* Careful. Some cpus do not strictly honor the set of cpus
28          * specified in the interrupt destination when using lowest
29          * priority interrupt delivery mode.
30          *
31          * In particular there was a hyperthreading cpu observed to
32          * deliver interrupts to the wrong hyperthread when only one
33          * hyperthread was specified in the interrupt desitination.
34          */
35         cpumask_t domain = { { [0] = APIC_ALL_CPUS, } };
36         return domain;
37 }
38
39 /*
40  * Set up the logical destination ID.
41  *
42  * Intel recommends to set DFR, LDR and TPR before enabling
43  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
44  * document number 292116).  So here it goes...
45  */
46 static void flat_init_apic_ldr(void)
47 {
48         unsigned long val;
49         unsigned long num, id;
50
51         num = smp_processor_id();
52         id = 1UL << num;
53         x86_cpu_to_log_apicid[num] = id;
54         apic_write(APIC_DFR, APIC_DFR_FLAT);
55         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
56         val |= SET_APIC_LOGICAL_ID(id);
57         apic_write(APIC_LDR, val);
58 }
59
60 static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
61 {
62         unsigned long mask = cpus_addr(cpumask)[0];
63         unsigned long cfg;
64         unsigned long flags;
65
66         local_irq_save(flags);
67
68         /*
69          * Wait for idle.
70          */
71         apic_wait_icr_idle();
72
73         /*
74          * prepare target chip field
75          */
76         cfg = __prepare_ICR2(mask);
77         apic_write(APIC_ICR2, cfg);
78
79         /*
80          * program the ICR
81          */
82         cfg = __prepare_ICR(0, vector, APIC_DEST_LOGICAL);
83
84         /*
85          * Send the IPI. The write to APIC_ICR fires this off.
86          */
87         apic_write(APIC_ICR, cfg);
88         local_irq_restore(flags);
89 }
90
91 static void flat_send_IPI_allbutself(int vector)
92 {
93 #ifdef  CONFIG_HOTPLUG_CPU
94         int hotplug = 1;
95 #else
96         int hotplug = 0;
97 #endif
98         if (hotplug || vector == NMI_VECTOR) {
99                 cpumask_t allbutme = cpu_online_map;
100
101                 cpu_clear(smp_processor_id(), allbutme);
102
103                 if (!cpus_empty(allbutme))
104                         flat_send_IPI_mask(allbutme, vector);
105         } else if (num_online_cpus() > 1) {
106                 __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
107         }
108 }
109
110 static void flat_send_IPI_all(int vector)
111 {
112         if (vector == NMI_VECTOR)
113                 flat_send_IPI_mask(cpu_online_map, vector);
114         else
115                 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
116 }
117
118 static int flat_apic_id_registered(void)
119 {
120         return physid_isset(GET_APIC_ID(apic_read(APIC_ID)), phys_cpu_present_map);
121 }
122
123 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
124 {
125         return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
126 }
127
128 static unsigned int phys_pkg_id(int index_msb)
129 {
130         return hard_smp_processor_id() >> index_msb;
131 }
132
133 struct genapic apic_flat =  {
134         .name = "flat",
135         .int_delivery_mode = dest_LowestPrio,
136         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
137         .target_cpus = flat_target_cpus,
138         .vector_allocation_domain = flat_vector_allocation_domain,
139         .apic_id_registered = flat_apic_id_registered,
140         .init_apic_ldr = flat_init_apic_ldr,
141         .send_IPI_all = flat_send_IPI_all,
142         .send_IPI_allbutself = flat_send_IPI_allbutself,
143         .send_IPI_mask = flat_send_IPI_mask,
144         .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
145         .phys_pkg_id = phys_pkg_id,
146 };
147
148 /*
149  * Physflat mode is used when there are more than 8 CPUs on a AMD system.
150  * We cannot use logical delivery in this case because the mask
151  * overflows, so use physical mode.
152  */
153
154 static cpumask_t physflat_target_cpus(void)
155 {
156         return cpu_online_map;
157 }
158
159 static cpumask_t physflat_vector_allocation_domain(int cpu)
160 {
161         cpumask_t domain = CPU_MASK_NONE;
162         cpu_set(cpu, domain);
163         return domain;
164 }
165
166
167 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
168 {
169         send_IPI_mask_sequence(cpumask, vector);
170 }
171
172 static void physflat_send_IPI_allbutself(int vector)
173 {
174         cpumask_t allbutme = cpu_online_map;
175
176         cpu_clear(smp_processor_id(), allbutme);
177         physflat_send_IPI_mask(allbutme, vector);
178 }
179
180 static void physflat_send_IPI_all(int vector)
181 {
182         physflat_send_IPI_mask(cpu_online_map, vector);
183 }
184
185 static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
186 {
187         int cpu;
188
189         /*
190          * We're using fixed IRQ delivery, can only return one phys APIC ID.
191          * May as well be the first.
192          */
193         cpu = first_cpu(cpumask);
194         if ((unsigned)cpu < NR_CPUS)
195                 return x86_cpu_to_apicid[cpu];
196         else
197                 return BAD_APICID;
198 }
199
200 struct genapic apic_physflat =  {
201         .name = "physical flat",
202         .int_delivery_mode = dest_Fixed,
203         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
204         .target_cpus = physflat_target_cpus,
205         .vector_allocation_domain = physflat_vector_allocation_domain,
206         .apic_id_registered = flat_apic_id_registered,
207         .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
208         .send_IPI_all = physflat_send_IPI_all,
209         .send_IPI_allbutself = physflat_send_IPI_allbutself,
210         .send_IPI_mask = physflat_send_IPI_mask,
211         .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
212         .phys_pkg_id = phys_pkg_id,
213 };