Merge tag 'mailbox-v5.19' of git://git.linaro.org/landing-teams/working/fujitsu/integ...
[linux-2.6-microblaze.git] / arch / x86 / kernel / apic / probe_32.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Default generic APIC driver. This handles up to 8 CPUs.
4  *
5  * Copyright 2003 Andi Kleen, SuSE Labs.
6  *
7  * Generic x86 APIC driver probe layer.
8  */
9 #include <linux/export.h>
10 #include <linux/errno.h>
11 #include <linux/smp.h>
12
13 #include <asm/io_apic.h>
14 #include <asm/apic.h>
15 #include <asm/acpi.h>
16
17 #include "local.h"
18
19 static int default_x86_32_early_logical_apicid(int cpu)
20 {
21         return 1 << cpu;
22 }
23
24 static void setup_apic_flat_routing(void)
25 {
26 #ifdef CONFIG_X86_IO_APIC
27         printk(KERN_INFO
28                 "Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
29                 nr_ioapics);
30 #endif
31 }
32
33 static int default_apic_id_registered(void)
34 {
35         return physid_isset(read_apic_id(), phys_cpu_present_map);
36 }
37
38 /*
39  * Set up the logical destination ID.  Intel recommends to set DFR, LDR and
40  * TPR before enabling an APIC.  See e.g. "AP-388 82489DX User's Manual"
41  * (Intel document number 292116).
42  */
43 static void default_init_apic_ldr(void)
44 {
45         unsigned long val;
46
47         apic_write(APIC_DFR, APIC_DFR_VALUE);
48         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
49         val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
50         apic_write(APIC_LDR, val);
51 }
52
53 static int default_phys_pkg_id(int cpuid_apic, int index_msb)
54 {
55         return cpuid_apic >> index_msb;
56 }
57
58 /* should be called last. */
59 static int probe_default(void)
60 {
61         return 1;
62 }
63
64 static struct apic apic_default __ro_after_init = {
65
66         .name                           = "default",
67         .probe                          = probe_default,
68         .acpi_madt_oem_check            = NULL,
69         .apic_id_valid                  = default_apic_id_valid,
70         .apic_id_registered             = default_apic_id_registered,
71
72         .delivery_mode                  = APIC_DELIVERY_MODE_FIXED,
73         .dest_mode_logical              = true,
74
75         .disable_esr                    = 0,
76
77         .check_apicid_used              = default_check_apicid_used,
78         .init_apic_ldr                  = default_init_apic_ldr,
79         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
80         .setup_apic_routing             = setup_apic_flat_routing,
81         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
82         .apicid_to_cpu_present          = physid_set_mask_of_physid,
83         .check_phys_apicid_present      = default_check_phys_apicid_present,
84         .phys_pkg_id                    = default_phys_pkg_id,
85
86         .get_apic_id                    = default_get_apic_id,
87         .set_apic_id                    = NULL,
88
89         .calc_dest_apicid               = apic_flat_calc_apicid,
90
91         .send_IPI                       = default_send_IPI_single,
92         .send_IPI_mask                  = default_send_IPI_mask_logical,
93         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
94         .send_IPI_allbutself            = default_send_IPI_allbutself,
95         .send_IPI_all                   = default_send_IPI_all,
96         .send_IPI_self                  = default_send_IPI_self,
97
98         .inquire_remote_apic            = default_inquire_remote_apic,
99
100         .read                           = native_apic_mem_read,
101         .write                          = native_apic_mem_write,
102         .eoi_write                      = native_apic_mem_write,
103         .icr_read                       = native_apic_icr_read,
104         .icr_write                      = native_apic_icr_write,
105         .wait_icr_idle                  = native_apic_wait_icr_idle,
106         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
107
108         .x86_32_early_logical_apicid    = default_x86_32_early_logical_apicid,
109 };
110
111 apic_driver(apic_default);
112
113 struct apic *apic __ro_after_init = &apic_default;
114 EXPORT_SYMBOL_GPL(apic);
115
116 static int cmdline_apic __initdata;
117 static int __init parse_apic(char *arg)
118 {
119         struct apic **drv;
120
121         if (!arg)
122                 return -EINVAL;
123
124         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
125                 if (!strcmp((*drv)->name, arg)) {
126                         apic = *drv;
127                         cmdline_apic = 1;
128                         return 0;
129                 }
130         }
131
132         /* Parsed again by __setup for debug/verbose */
133         return 0;
134 }
135 early_param("apic", parse_apic);
136
137 void __init default_setup_apic_routing(void)
138 {
139         int version = boot_cpu_apic_version;
140
141         if (num_possible_cpus() > 8) {
142                 switch (boot_cpu_data.x86_vendor) {
143                 case X86_VENDOR_INTEL:
144                         if (!APIC_XAPIC(version)) {
145                                 def_to_bigsmp = 0;
146                                 break;
147                         }
148                         /* P4 and above */
149                         fallthrough;
150                 case X86_VENDOR_HYGON:
151                 case X86_VENDOR_AMD:
152                         def_to_bigsmp = 1;
153                 }
154         }
155
156 #ifdef CONFIG_X86_BIGSMP
157         /*
158          * This is used to switch to bigsmp mode when
159          * - There is no apic= option specified by the user
160          * - generic_apic_probe() has chosen apic_default as the sub_arch
161          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
162          */
163
164         if (!cmdline_apic && apic == &apic_default)
165                 generic_bigsmp_probe();
166 #endif
167
168         if (apic->setup_apic_routing)
169                 apic->setup_apic_routing();
170 }
171
172 void __init generic_apic_probe(void)
173 {
174         if (!cmdline_apic) {
175                 struct apic **drv;
176
177                 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
178                         if ((*drv)->probe()) {
179                                 apic = *drv;
180                                 break;
181                         }
182                 }
183                 /* Not visible without early console */
184                 if (drv == __apicdrivers_end)
185                         panic("Didn't find an APIC driver");
186         }
187         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
188 }
189
190 /* This function can switch the APIC even after the initial ->probe() */
191 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
192 {
193         struct apic **drv;
194
195         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
196                 if (!(*drv)->acpi_madt_oem_check)
197                         continue;
198                 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
199                         continue;
200
201                 if (!cmdline_apic) {
202                         apic = *drv;
203                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
204                                apic->name);
205                 }
206                 return 1;
207         }
208         return 0;
209 }