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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
4 *
5 * Drives the local APIC in "clustered mode".
6 */
7#include <linux/cpumask.h>
8#include <linux/dmi.h>
9#include <linux/smp.h>
10
11#include <asm/apic.h>
12#include <asm/io_apic.h>
13
14#include "local.h"
15
16static u32 bigsmp_get_apic_id(u32 x)
17{
18 return (x >> 24) & 0xFF;
19}
20
21static void bigsmp_send_IPI_allbutself(int vector)
22{
23 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
24}
25
26static void bigsmp_send_IPI_all(int vector)
27{
28 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
29}
30
31static int dmi_bigsmp; /* can be set by dmi scanners */
32
33static int hp_ht_bigsmp(const struct dmi_system_id *d)
34{
35 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
36 dmi_bigsmp = 1;
37
38 return 0;
39}
40
41
42static const struct dmi_system_id bigsmp_dmi_table[] = {
43 { hp_ht_bigsmp, "HP ProLiant DL760 G2",
44 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
45 DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
46 }
47 },
48
49 { hp_ht_bigsmp, "HP ProLiant DL740",
50 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
51 DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
52 }
53 },
54 { } /* NULL entry stops DMI scanning */
55};
56
57static int probe_bigsmp(void)
58{
59 return dmi_check_system(bigsmp_dmi_table);
60}
61
62static struct apic apic_bigsmp __ro_after_init = {
63
64 .name = "bigsmp",
65 .probe = probe_bigsmp,
66
67 .dest_mode_logical = false,
68
69 .disable_esr = 1,
70
71 .cpu_present_to_apicid = default_cpu_present_to_apicid,
72
73 .max_apic_id = 0xFE,
74 .get_apic_id = bigsmp_get_apic_id,
75
76 .calc_dest_apicid = apic_default_calc_apicid,
77
78 .send_IPI = default_send_IPI_single_phys,
79 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
80 .send_IPI_mask_allbutself = NULL,
81 .send_IPI_allbutself = bigsmp_send_IPI_allbutself,
82 .send_IPI_all = bigsmp_send_IPI_all,
83 .send_IPI_self = default_send_IPI_self,
84
85 .read = native_apic_mem_read,
86 .write = native_apic_mem_write,
87 .eoi = native_apic_mem_eoi,
88 .icr_read = native_apic_icr_read,
89 .icr_write = native_apic_icr_write,
90 .wait_icr_idle = apic_mem_wait_icr_idle,
91 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout,
92};
93
94bool __init apic_bigsmp_possible(bool cmdline_override)
95{
96 return apic == &apic_bigsmp || !cmdline_override;
97}
98
99void __init apic_bigsmp_force(void)
100{
101 if (apic != &apic_bigsmp)
102 apic_install_driver(&apic_bigsmp);
103}
104
105apic_driver(apic_bigsmp);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
4 *
5 * Drives the local APIC in "clustered mode".
6 */
7#include <linux/threads.h>
8#include <linux/cpumask.h>
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/dmi.h>
12#include <linux/smp.h>
13
14#include <asm/apicdef.h>
15#include <asm/fixmap.h>
16#include <asm/mpspec.h>
17#include <asm/apic.h>
18#include <asm/ipi.h>
19
20static unsigned bigsmp_get_apic_id(unsigned long x)
21{
22 return (x >> 24) & 0xFF;
23}
24
25static int bigsmp_apic_id_registered(void)
26{
27 return 1;
28}
29
30static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
31{
32 return false;
33}
34
35static int bigsmp_early_logical_apicid(int cpu)
36{
37 /* on bigsmp, logical apicid is the same as physical */
38 return early_per_cpu(x86_cpu_to_apicid, cpu);
39}
40
41static inline unsigned long calculate_ldr(int cpu)
42{
43 unsigned long val, id;
44
45 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
46 id = per_cpu(x86_bios_cpu_apicid, cpu);
47 val |= SET_APIC_LOGICAL_ID(id);
48
49 return val;
50}
51
52/*
53 * Set up the logical destination ID.
54 *
55 * Intel recommends to set DFR, LDR and TPR before enabling
56 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
57 * document number 292116). So here it goes...
58 */
59static void bigsmp_init_apic_ldr(void)
60{
61 unsigned long val;
62 int cpu = smp_processor_id();
63
64 apic_write(APIC_DFR, APIC_DFR_FLAT);
65 val = calculate_ldr(cpu);
66 apic_write(APIC_LDR, val);
67}
68
69static void bigsmp_setup_apic_routing(void)
70{
71 printk(KERN_INFO
72 "Enabling APIC mode: Physflat. Using %d I/O APICs\n",
73 nr_ioapics);
74}
75
76static int bigsmp_cpu_present_to_apicid(int mps_cpu)
77{
78 if (mps_cpu < nr_cpu_ids)
79 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
80
81 return BAD_APICID;
82}
83
84static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
85{
86 /* For clustered we don't have a good way to do this yet - hack */
87 physids_promote(0xFFL, retmap);
88}
89
90static int bigsmp_check_phys_apicid_present(int phys_apicid)
91{
92 return 1;
93}
94
95static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
96{
97 return cpuid_apic >> index_msb;
98}
99
100static void bigsmp_send_IPI_allbutself(int vector)
101{
102 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
103}
104
105static void bigsmp_send_IPI_all(int vector)
106{
107 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
108}
109
110static int dmi_bigsmp; /* can be set by dmi scanners */
111
112static int hp_ht_bigsmp(const struct dmi_system_id *d)
113{
114 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
115 dmi_bigsmp = 1;
116
117 return 0;
118}
119
120
121static const struct dmi_system_id bigsmp_dmi_table[] = {
122 { hp_ht_bigsmp, "HP ProLiant DL760 G2",
123 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
124 DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
125 }
126 },
127
128 { hp_ht_bigsmp, "HP ProLiant DL740",
129 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
130 DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
131 }
132 },
133 { } /* NULL entry stops DMI scanning */
134};
135
136static int probe_bigsmp(void)
137{
138 if (def_to_bigsmp)
139 dmi_bigsmp = 1;
140 else
141 dmi_check_system(bigsmp_dmi_table);
142
143 return dmi_bigsmp;
144}
145
146static struct apic apic_bigsmp __ro_after_init = {
147
148 .name = "bigsmp",
149 .probe = probe_bigsmp,
150 .acpi_madt_oem_check = NULL,
151 .apic_id_valid = default_apic_id_valid,
152 .apic_id_registered = bigsmp_apic_id_registered,
153
154 .irq_delivery_mode = dest_Fixed,
155 /* phys delivery to target CPU: */
156 .irq_dest_mode = 0,
157
158 .disable_esr = 1,
159 .dest_logical = 0,
160 .check_apicid_used = bigsmp_check_apicid_used,
161
162 .init_apic_ldr = bigsmp_init_apic_ldr,
163
164 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map,
165 .setup_apic_routing = bigsmp_setup_apic_routing,
166 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid,
167 .apicid_to_cpu_present = physid_set_mask_of_physid,
168 .check_phys_apicid_present = bigsmp_check_phys_apicid_present,
169 .phys_pkg_id = bigsmp_phys_pkg_id,
170
171 .get_apic_id = bigsmp_get_apic_id,
172 .set_apic_id = NULL,
173
174 .calc_dest_apicid = apic_default_calc_apicid,
175
176 .send_IPI = default_send_IPI_single_phys,
177 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
178 .send_IPI_mask_allbutself = NULL,
179 .send_IPI_allbutself = bigsmp_send_IPI_allbutself,
180 .send_IPI_all = bigsmp_send_IPI_all,
181 .send_IPI_self = default_send_IPI_self,
182
183 .inquire_remote_apic = default_inquire_remote_apic,
184
185 .read = native_apic_mem_read,
186 .write = native_apic_mem_write,
187 .eoi_write = native_apic_mem_write,
188 .icr_read = native_apic_icr_read,
189 .icr_write = native_apic_icr_write,
190 .wait_icr_idle = native_apic_wait_icr_idle,
191 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
192
193 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid,
194};
195
196void __init generic_bigsmp_probe(void)
197{
198 unsigned int cpu;
199
200 if (!probe_bigsmp())
201 return;
202
203 apic = &apic_bigsmp;
204
205 for_each_possible_cpu(cpu) {
206 if (early_per_cpu(x86_cpu_to_logical_apicid,
207 cpu) == BAD_APICID)
208 continue;
209 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
210 bigsmp_early_logical_apicid(cpu);
211 }
212
213 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
214}
215
216apic_driver(apic_bigsmp);