0787bb3412f4fe98d55479c813c792705043dbe2
[pandora-kernel.git] / arch / x86 / kernel / apic / probe_32.c
1 /*
2  * Default generic APIC driver. This handles up to 8 CPUs.
3  *
4  * Copyright 2003 Andi Kleen, SuSE Labs.
5  * Subject to the GNU Public License, v.2
6  *
7  * Generic x86 APIC driver probe layer.
8  */
9 #include <linux/threads.h>
10 #include <linux/cpumask.h>
11 #include <linux/module.h>
12 #include <linux/string.h>
13 #include <linux/kernel.h>
14 #include <linux/ctype.h>
15 #include <linux/init.h>
16 #include <linux/errno.h>
17 #include <asm/fixmap.h>
18 #include <asm/mpspec.h>
19 #include <asm/apicdef.h>
20 #include <asm/apic.h>
21 #include <asm/setup.h>
22
23 #include <linux/smp.h>
24 #include <asm/ipi.h>
25
26 #include <linux/interrupt.h>
27 #include <asm/acpi.h>
28 #include <asm/e820.h>
29
30 #ifdef CONFIG_HOTPLUG_CPU
31 #define DEFAULT_SEND_IPI        (1)
32 #else
33 #define DEFAULT_SEND_IPI        (0)
34 #endif
35
36 int no_broadcast = DEFAULT_SEND_IPI;
37
38 static __init int no_ipi_broadcast(char *str)
39 {
40         get_option(&str, &no_broadcast);
41         pr_info("Using %s mode\n",
42                 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
43         return 1;
44 }
45 __setup("no_ipi_broadcast=", no_ipi_broadcast);
46
47 static int __init print_ipi_mode(void)
48 {
49         pr_info("Using IPI %s mode\n",
50                 no_broadcast ? "No-Shortcut" : "Shortcut");
51         return 0;
52 }
53 late_initcall(print_ipi_mode);
54
55 static int default_x86_32_early_logical_apicid(int cpu)
56 {
57         return 1 << cpu;
58 }
59
60 static void setup_apic_flat_routing(void)
61 {
62 #ifdef CONFIG_X86_IO_APIC
63         printk(KERN_INFO
64                 "Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
65                 nr_ioapics);
66 #endif
67 }
68
69 static void default_vector_allocation_domain(int cpu, struct cpumask *retmask)
70 {
71         /*
72          * Careful. Some cpus do not strictly honor the set of cpus
73          * specified in the interrupt destination when using lowest
74          * priority interrupt delivery mode.
75          *
76          * In particular there was a hyperthreading cpu observed to
77          * deliver interrupts to the wrong hyperthread when only one
78          * hyperthread was specified in the interrupt desitination.
79          */
80         cpumask_clear(retmask);
81         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
82 }
83
84 /* should be called last. */
85 static int probe_default(void)
86 {
87         return 1;
88 }
89
90 static struct apic apic_default = {
91
92         .name                           = "default",
93         .probe                          = probe_default,
94         .acpi_madt_oem_check            = NULL,
95         .apic_id_registered             = default_apic_id_registered,
96
97         .irq_delivery_mode              = dest_LowestPrio,
98         /* logical delivery broadcast to all CPUs: */
99         .irq_dest_mode                  = 1,
100
101         .target_cpus                    = default_target_cpus,
102         .disable_esr                    = 0,
103         .dest_logical                   = APIC_DEST_LOGICAL,
104         .check_apicid_used              = default_check_apicid_used,
105         .check_apicid_present           = default_check_apicid_present,
106
107         .vector_allocation_domain       = default_vector_allocation_domain,
108         .init_apic_ldr                  = default_init_apic_ldr,
109
110         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
111         .setup_apic_routing             = setup_apic_flat_routing,
112         .multi_timer_check              = NULL,
113         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
114         .apicid_to_cpu_present          = physid_set_mask_of_physid,
115         .setup_portio_remap             = NULL,
116         .check_phys_apicid_present      = default_check_phys_apicid_present,
117         .enable_apic_mode               = NULL,
118         .phys_pkg_id                    = default_phys_pkg_id,
119         .mps_oem_check                  = NULL,
120
121         .get_apic_id                    = default_get_apic_id,
122         .set_apic_id                    = NULL,
123         .apic_id_mask                   = 0x0F << 24,
124
125         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
126         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
127
128         .send_IPI_mask                  = default_send_IPI_mask_logical,
129         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
130         .send_IPI_allbutself            = default_send_IPI_allbutself,
131         .send_IPI_all                   = default_send_IPI_all,
132         .send_IPI_self                  = default_send_IPI_self,
133
134         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
135         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
136
137         .wait_for_init_deassert         = default_wait_for_init_deassert,
138
139         .smp_callin_clear_local_apic    = NULL,
140         .inquire_remote_apic            = default_inquire_remote_apic,
141
142         .read                           = native_apic_mem_read,
143         .write                          = native_apic_mem_write,
144         .icr_read                       = native_apic_icr_read,
145         .icr_write                      = native_apic_icr_write,
146         .wait_icr_idle                  = native_apic_wait_icr_idle,
147         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
148
149         .x86_32_early_logical_apicid    = default_x86_32_early_logical_apicid,
150 };
151
152 apic_driver(apic_default);
153
154 struct apic *apic = &apic_default;
155 EXPORT_SYMBOL_GPL(apic);
156
157 static int cmdline_apic __initdata;
158 static int __init parse_apic(char *arg)
159 {
160         struct apic **drv;
161
162         if (!arg)
163                 return -EINVAL;
164
165         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
166                 if (!strcmp((*drv)->name, arg)) {
167                         apic = *drv;
168                         cmdline_apic = 1;
169                         return 0;
170                 }
171         }
172
173         /* Parsed again by __setup for debug/verbose */
174         return 0;
175 }
176 early_param("apic", parse_apic);
177
178 void __init default_setup_apic_routing(void)
179 {
180         int version = apic_version[boot_cpu_physical_apicid];
181
182         if (num_possible_cpus() > 8) {
183                 switch (boot_cpu_data.x86_vendor) {
184                 case X86_VENDOR_INTEL:
185                         if (!APIC_XAPIC(version)) {
186                                 def_to_bigsmp = 0;
187                                 break;
188                         }
189                         /* If P4 and above fall through */
190                 case X86_VENDOR_AMD:
191                         def_to_bigsmp = 1;
192                 }
193         }
194
195 #ifdef CONFIG_X86_BIGSMP
196         /*
197          * This is used to switch to bigsmp mode when
198          * - There is no apic= option specified by the user
199          * - generic_apic_probe() has chosen apic_default as the sub_arch
200          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
201          */
202
203         if (!cmdline_apic && apic == &apic_default)
204                 generic_bigsmp_probe();
205 #endif
206
207         if (apic->setup_apic_routing)
208                 apic->setup_apic_routing();
209 }
210
211 void __init generic_apic_probe(void)
212 {
213         if (!cmdline_apic) {
214                 struct apic **drv;
215
216                 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
217                         if ((*drv)->probe()) {
218                                 apic = *drv;
219                                 break;
220                         }
221                 }
222                 /* Not visible without early console */
223                 if (drv == __apicdrivers_end)
224                         panic("Didn't find an APIC driver");
225         }
226         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
227 }
228
229 /* These functions can switch the APIC even after the initial ->probe() */
230
231 int __init
232 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
233 {
234         struct apic **drv;
235
236         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
237                 if (!((*drv)->mps_oem_check))
238                         continue;
239                 if (!(*drv)->mps_oem_check(mpc, oem, productid))
240                         continue;
241
242                 if (!cmdline_apic) {
243                         apic = *drv;
244                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
245                                apic->name);
246                 }
247                 return 1;
248         }
249         return 0;
250 }
251
252 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
253 {
254         struct apic **drv;
255
256         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
257                 if (!(*drv)->acpi_madt_oem_check)
258                         continue;
259                 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
260                         continue;
261
262                 if (!cmdline_apic) {
263                         apic = *drv;
264                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
265                                apic->name);
266                 }
267                 return 1;
268         }
269         return 0;
270 }