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Linux/arch/x86/kernel/apic/probe_32.c

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  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 /* should be called last. */
 70 static int probe_default(void)
 71 {
 72         return 1;
 73 }
 74 
 75 static struct apic apic_default = {
 76 
 77         .name                           = "default",
 78         .probe                          = probe_default,
 79         .acpi_madt_oem_check            = NULL,
 80         .apic_id_valid                  = default_apic_id_valid,
 81         .apic_id_registered             = default_apic_id_registered,
 82 
 83         .irq_delivery_mode              = dest_LowestPrio,
 84         /* logical delivery broadcast to all CPUs: */
 85         .irq_dest_mode                  = 1,
 86 
 87         .target_cpus                    = default_target_cpus,
 88         .disable_esr                    = 0,
 89         .dest_logical                   = APIC_DEST_LOGICAL,
 90         .check_apicid_used              = default_check_apicid_used,
 91         .check_apicid_present           = default_check_apicid_present,
 92 
 93         .vector_allocation_domain       = flat_vector_allocation_domain,
 94         .init_apic_ldr                  = default_init_apic_ldr,
 95 
 96         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
 97         .setup_apic_routing             = setup_apic_flat_routing,
 98         .multi_timer_check              = NULL,
 99         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
100         .apicid_to_cpu_present          = physid_set_mask_of_physid,
101         .setup_portio_remap             = NULL,
102         .check_phys_apicid_present      = default_check_phys_apicid_present,
103         .enable_apic_mode               = NULL,
104         .phys_pkg_id                    = default_phys_pkg_id,
105         .mps_oem_check                  = NULL,
106 
107         .get_apic_id                    = default_get_apic_id,
108         .set_apic_id                    = NULL,
109         .apic_id_mask                   = 0x0F << 24,
110 
111         .cpu_mask_to_apicid_and         = flat_cpu_mask_to_apicid_and,
112 
113         .send_IPI_mask                  = default_send_IPI_mask_logical,
114         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
115         .send_IPI_allbutself            = default_send_IPI_allbutself,
116         .send_IPI_all                   = default_send_IPI_all,
117         .send_IPI_self                  = default_send_IPI_self,
118 
119         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
120         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
121 
122         .wait_for_init_deassert         = default_wait_for_init_deassert,
123 
124         .smp_callin_clear_local_apic    = NULL,
125         .inquire_remote_apic            = default_inquire_remote_apic,
126 
127         .read                           = native_apic_mem_read,
128         .write                          = native_apic_mem_write,
129         .eoi_write                      = native_apic_mem_write,
130         .icr_read                       = native_apic_icr_read,
131         .icr_write                      = native_apic_icr_write,
132         .wait_icr_idle                  = native_apic_wait_icr_idle,
133         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
134 
135         .x86_32_early_logical_apicid    = default_x86_32_early_logical_apicid,
136 };
137 
138 apic_driver(apic_default);
139 
140 struct apic *apic = &apic_default;
141 EXPORT_SYMBOL_GPL(apic);
142 
143 static int cmdline_apic __initdata;
144 static int __init parse_apic(char *arg)
145 {
146         struct apic **drv;
147 
148         if (!arg)
149                 return -EINVAL;
150 
151         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
152                 if (!strcmp((*drv)->name, arg)) {
153                         apic = *drv;
154                         cmdline_apic = 1;
155                         return 0;
156                 }
157         }
158 
159         /* Parsed again by __setup for debug/verbose */
160         return 0;
161 }
162 early_param("apic", parse_apic);
163 
164 void __init default_setup_apic_routing(void)
165 {
166         int version = apic_version[boot_cpu_physical_apicid];
167 
168         if (num_possible_cpus() > 8) {
169                 switch (boot_cpu_data.x86_vendor) {
170                 case X86_VENDOR_INTEL:
171                         if (!APIC_XAPIC(version)) {
172                                 def_to_bigsmp = 0;
173                                 break;
174                         }
175                         /* If P4 and above fall through */
176                 case X86_VENDOR_AMD:
177                         def_to_bigsmp = 1;
178                 }
179         }
180 
181 #ifdef CONFIG_X86_BIGSMP
182         /*
183          * This is used to switch to bigsmp mode when
184          * - There is no apic= option specified by the user
185          * - generic_apic_probe() has chosen apic_default as the sub_arch
186          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
187          */
188 
189         if (!cmdline_apic && apic == &apic_default)
190                 generic_bigsmp_probe();
191 #endif
192 
193         if (apic->setup_apic_routing)
194                 apic->setup_apic_routing();
195 
196         if (x86_platform.apic_post_init)
197                 x86_platform.apic_post_init();
198 }
199 
200 void __init generic_apic_probe(void)
201 {
202         if (!cmdline_apic) {
203                 struct apic **drv;
204 
205                 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
206                         if ((*drv)->probe()) {
207                                 apic = *drv;
208                                 break;
209                         }
210                 }
211                 /* Not visible without early console */
212                 if (drv == __apicdrivers_end)
213                         panic("Didn't find an APIC driver");
214         }
215         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
216 }
217 
218 /* These functions can switch the APIC even after the initial ->probe() */
219 
220 int __init
221 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
222 {
223         struct apic **drv;
224 
225         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
226                 if (!((*drv)->mps_oem_check))
227                         continue;
228                 if (!(*drv)->mps_oem_check(mpc, oem, productid))
229                         continue;
230 
231                 if (!cmdline_apic) {
232                         apic = *drv;
233                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
234                                apic->name);
235                 }
236                 return 1;
237         }
238         return 0;
239 }
240 
241 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
242 {
243         struct apic **drv;
244 
245         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
246                 if (!(*drv)->acpi_madt_oem_check)
247                         continue;
248                 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
249                         continue;
250 
251                 if (!cmdline_apic) {
252                         apic = *drv;
253                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
254                                apic->name);
255                 }
256                 return 1;
257         }
258         return 0;
259 }
260 

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