x86_64: abstract how we find the iommu_table for a device
[linux-2.6] / 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/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         x86_cpu_to_log_apicid[num] = id;
56         apic_write(APIC_DFR, APIC_DFR_FLAT);
57         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
58         val |= SET_APIC_LOGICAL_ID(id);
59         apic_write(APIC_LDR, val);
60 }
61
62 static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
63 {
64         unsigned long mask = cpus_addr(cpumask)[0];
65         unsigned long flags;
66
67         local_irq_save(flags);
68         __send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL);
69         local_irq_restore(flags);
70 }
71
72 static void flat_send_IPI_allbutself(int vector)
73 {
74 #ifdef  CONFIG_HOTPLUG_CPU
75         int hotplug = 1;
76 #else
77         int hotplug = 0;
78 #endif
79         if (hotplug || vector == NMI_VECTOR) {
80                 cpumask_t allbutme = cpu_online_map;
81
82                 cpu_clear(smp_processor_id(), allbutme);
83
84                 if (!cpus_empty(allbutme))
85                         flat_send_IPI_mask(allbutme, vector);
86         } else if (num_online_cpus() > 1) {
87                 __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
88         }
89 }
90
91 static void flat_send_IPI_all(int vector)
92 {
93         if (vector == NMI_VECTOR)
94                 flat_send_IPI_mask(cpu_online_map, vector);
95         else
96                 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
97 }
98
99 static int flat_apic_id_registered(void)
100 {
101         return physid_isset(GET_APIC_ID(apic_read(APIC_ID)), phys_cpu_present_map);
102 }
103
104 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
105 {
106         return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
107 }
108
109 static unsigned int phys_pkg_id(int index_msb)
110 {
111         return hard_smp_processor_id() >> index_msb;
112 }
113
114 struct genapic apic_flat =  {
115         .name = "flat",
116         .int_delivery_mode = dest_LowestPrio,
117         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
118         .target_cpus = flat_target_cpus,
119         .vector_allocation_domain = flat_vector_allocation_domain,
120         .apic_id_registered = flat_apic_id_registered,
121         .init_apic_ldr = flat_init_apic_ldr,
122         .send_IPI_all = flat_send_IPI_all,
123         .send_IPI_allbutself = flat_send_IPI_allbutself,
124         .send_IPI_mask = flat_send_IPI_mask,
125         .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
126         .phys_pkg_id = phys_pkg_id,
127 };
128
129 /*
130  * Physflat mode is used when there are more than 8 CPUs on a AMD system.
131  * We cannot use logical delivery in this case because the mask
132  * overflows, so use physical mode.
133  */
134
135 static cpumask_t physflat_target_cpus(void)
136 {
137         return cpu_online_map;
138 }
139
140 static cpumask_t physflat_vector_allocation_domain(int cpu)
141 {
142         cpumask_t domain = CPU_MASK_NONE;
143         cpu_set(cpu, domain);
144         return domain;
145 }
146
147
148 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
149 {
150         send_IPI_mask_sequence(cpumask, vector);
151 }
152
153 static void physflat_send_IPI_allbutself(int vector)
154 {
155         cpumask_t allbutme = cpu_online_map;
156
157         cpu_clear(smp_processor_id(), allbutme);
158         physflat_send_IPI_mask(allbutme, vector);
159 }
160
161 static void physflat_send_IPI_all(int vector)
162 {
163         physflat_send_IPI_mask(cpu_online_map, vector);
164 }
165
166 static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
167 {
168         int cpu;
169
170         /*
171          * We're using fixed IRQ delivery, can only return one phys APIC ID.
172          * May as well be the first.
173          */
174         cpu = first_cpu(cpumask);
175         if ((unsigned)cpu < NR_CPUS)
176                 return x86_cpu_to_apicid[cpu];
177         else
178                 return BAD_APICID;
179 }
180
181 struct genapic apic_physflat =  {
182         .name = "physical flat",
183         .int_delivery_mode = dest_Fixed,
184         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
185         .target_cpus = physflat_target_cpus,
186         .vector_allocation_domain = physflat_vector_allocation_domain,
187         .apic_id_registered = flat_apic_id_registered,
188         .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
189         .send_IPI_all = physflat_send_IPI_all,
190         .send_IPI_allbutself = physflat_send_IPI_allbutself,
191         .send_IPI_mask = physflat_send_IPI_mask,
192         .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
193         .phys_pkg_id = phys_pkg_id,
194 };