Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-only
2 : /*
3 : * Copyright 2004 James Cleverdon, IBM.
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/cpumask.h>
12 : #include <linux/export.h>
13 : #include <linux/acpi.h>
14 :
15 : #include <asm/jailhouse_para.h>
16 : #include <asm/apic.h>
17 :
18 : #include "local.h"
19 :
20 : static struct apic apic_physflat;
21 : static struct apic apic_flat;
22 :
23 : struct apic *apic __ro_after_init = &apic_flat;
24 : EXPORT_SYMBOL_GPL(apic);
25 :
26 0 : static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
27 : {
28 0 : return 1;
29 : }
30 :
31 : /*
32 : * Set up the logical destination ID.
33 : *
34 : * Intel recommends to set DFR, LDR and TPR before enabling
35 : * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
36 : * document number 292116). So here it goes...
37 : */
38 4 : void flat_init_apic_ldr(void)
39 : {
40 4 : unsigned long val;
41 4 : unsigned long num, id;
42 :
43 4 : num = smp_processor_id();
44 4 : id = 1UL << num;
45 4 : apic_write(APIC_DFR, APIC_DFR_FLAT);
46 4 : val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
47 4 : val |= SET_APIC_LOGICAL_ID(id);
48 4 : apic_write(APIC_LDR, val);
49 4 : }
50 :
51 0 : static void _flat_send_IPI_mask(unsigned long mask, int vector)
52 : {
53 0 : unsigned long flags;
54 :
55 0 : local_irq_save(flags);
56 0 : __default_send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL);
57 0 : local_irq_restore(flags);
58 0 : }
59 :
60 0 : static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
61 : {
62 0 : unsigned long mask = cpumask_bits(cpumask)[0];
63 :
64 0 : _flat_send_IPI_mask(mask, vector);
65 0 : }
66 :
67 : static void
68 0 : flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
69 : {
70 0 : unsigned long mask = cpumask_bits(cpumask)[0];
71 0 : int cpu = smp_processor_id();
72 :
73 0 : if (cpu < BITS_PER_LONG)
74 0 : __clear_bit(cpu, &mask);
75 :
76 0 : _flat_send_IPI_mask(mask, vector);
77 0 : }
78 :
79 8 : static unsigned int flat_get_apic_id(unsigned long x)
80 : {
81 8 : return (x >> 24) & 0xFF;
82 : }
83 :
84 0 : static u32 set_apic_id(unsigned int id)
85 : {
86 0 : return (id & 0xFF) << 24;
87 : }
88 :
89 4 : static unsigned int read_xapic_id(void)
90 : {
91 8 : return flat_get_apic_id(apic_read(APIC_ID));
92 : }
93 :
94 4 : static int flat_apic_id_registered(void)
95 : {
96 4 : return physid_isset(read_xapic_id(), phys_cpu_present_map);
97 : }
98 :
99 16 : static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
100 : {
101 16 : return initial_apic_id >> index_msb;
102 : }
103 :
104 1 : static int flat_probe(void)
105 : {
106 1 : return 1;
107 : }
108 :
109 : static struct apic apic_flat __ro_after_init = {
110 : .name = "flat",
111 : .probe = flat_probe,
112 : .acpi_madt_oem_check = flat_acpi_madt_oem_check,
113 : .apic_id_valid = default_apic_id_valid,
114 : .apic_id_registered = flat_apic_id_registered,
115 :
116 : .delivery_mode = APIC_DELIVERY_MODE_FIXED,
117 : .dest_mode_logical = true,
118 :
119 : .disable_esr = 0,
120 :
121 : .check_apicid_used = NULL,
122 : .init_apic_ldr = flat_init_apic_ldr,
123 : .ioapic_phys_id_map = NULL,
124 : .setup_apic_routing = NULL,
125 : .cpu_present_to_apicid = default_cpu_present_to_apicid,
126 : .apicid_to_cpu_present = NULL,
127 : .check_phys_apicid_present = default_check_phys_apicid_present,
128 : .phys_pkg_id = flat_phys_pkg_id,
129 :
130 : .get_apic_id = flat_get_apic_id,
131 : .set_apic_id = set_apic_id,
132 :
133 : .calc_dest_apicid = apic_flat_calc_apicid,
134 :
135 : .send_IPI = default_send_IPI_single,
136 : .send_IPI_mask = flat_send_IPI_mask,
137 : .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
138 : .send_IPI_allbutself = default_send_IPI_allbutself,
139 : .send_IPI_all = default_send_IPI_all,
140 : .send_IPI_self = default_send_IPI_self,
141 :
142 : .inquire_remote_apic = default_inquire_remote_apic,
143 :
144 : .read = native_apic_mem_read,
145 : .write = native_apic_mem_write,
146 : .eoi_write = native_apic_mem_write,
147 : .icr_read = native_apic_icr_read,
148 : .icr_write = native_apic_icr_write,
149 : .wait_icr_idle = native_apic_wait_icr_idle,
150 : .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
151 : };
152 :
153 : /*
154 : * Physflat mode is used when there are more than 8 CPUs on a system.
155 : * We cannot use logical delivery in this case because the mask
156 : * overflows, so use physical mode.
157 : */
158 0 : static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
159 : {
160 : #ifdef CONFIG_ACPI
161 : /*
162 : * Quirk: some x86_64 machines can only use physical APIC mode
163 : * regardless of how many processors are present (x86_64 ES7000
164 : * is an example).
165 : */
166 : if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
167 : (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
168 : printk(KERN_DEBUG "system APIC only can use physical flat");
169 : return 1;
170 : }
171 :
172 : if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
173 : printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
174 : return 1;
175 : }
176 : #endif
177 :
178 0 : return 0;
179 : }
180 :
181 0 : static void physflat_init_apic_ldr(void)
182 : {
183 : /*
184 : * LDR and DFR are not involved in physflat mode, rather:
185 : * "In physical destination mode, the destination processor is
186 : * specified by its local APIC ID [...]." (Intel SDM, 10.6.2.1)
187 : */
188 0 : }
189 :
190 1 : static int physflat_probe(void)
191 : {
192 1 : if (apic == &apic_physflat || num_possible_cpus() > 8 ||
193 : jailhouse_paravirt())
194 0 : return 1;
195 :
196 : return 0;
197 : }
198 :
199 : static struct apic apic_physflat __ro_after_init = {
200 :
201 : .name = "physical flat",
202 : .probe = physflat_probe,
203 : .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
204 : .apic_id_valid = default_apic_id_valid,
205 : .apic_id_registered = flat_apic_id_registered,
206 :
207 : .delivery_mode = APIC_DELIVERY_MODE_FIXED,
208 : .dest_mode_logical = false,
209 :
210 : .disable_esr = 0,
211 :
212 : .check_apicid_used = NULL,
213 : .init_apic_ldr = physflat_init_apic_ldr,
214 : .ioapic_phys_id_map = NULL,
215 : .setup_apic_routing = NULL,
216 : .cpu_present_to_apicid = default_cpu_present_to_apicid,
217 : .apicid_to_cpu_present = NULL,
218 : .check_phys_apicid_present = default_check_phys_apicid_present,
219 : .phys_pkg_id = flat_phys_pkg_id,
220 :
221 : .get_apic_id = flat_get_apic_id,
222 : .set_apic_id = set_apic_id,
223 :
224 : .calc_dest_apicid = apic_default_calc_apicid,
225 :
226 : .send_IPI = default_send_IPI_single_phys,
227 : .send_IPI_mask = default_send_IPI_mask_sequence_phys,
228 : .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys,
229 : .send_IPI_allbutself = default_send_IPI_allbutself,
230 : .send_IPI_all = default_send_IPI_all,
231 : .send_IPI_self = default_send_IPI_self,
232 :
233 : .inquire_remote_apic = default_inquire_remote_apic,
234 :
235 : .read = native_apic_mem_read,
236 : .write = native_apic_mem_write,
237 : .eoi_write = native_apic_mem_write,
238 : .icr_read = native_apic_icr_read,
239 : .icr_write = native_apic_icr_write,
240 : .wait_icr_idle = native_apic_wait_icr_idle,
241 : .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
242 : };
243 :
244 : /*
245 : * We need to check for physflat first, so this order is important.
246 : */
247 : apic_drivers(apic_physflat, apic_flat);
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