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
bigsmp_get_apic_id(unsigned long x)16 static unsigned bigsmp_get_apic_id(unsigned long x)
17 {
18 return (x >> 24) & 0xFF;
19 }
20
bigsmp_apic_id_registered(void)21 static int bigsmp_apic_id_registered(void)
22 {
23 return 1;
24 }
25
bigsmp_check_apicid_used(physid_mask_t * map,int apicid)26 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
27 {
28 return false;
29 }
30
bigsmp_early_logical_apicid(int cpu)31 static int bigsmp_early_logical_apicid(int cpu)
32 {
33 /* on bigsmp, logical apicid is the same as physical */
34 return early_per_cpu(x86_cpu_to_apicid, cpu);
35 }
36
37 /*
38 * bigsmp enables physical destination mode
39 * and doesn't use LDR and DFR
40 */
bigsmp_init_apic_ldr(void)41 static void bigsmp_init_apic_ldr(void)
42 {
43 }
44
bigsmp_setup_apic_routing(void)45 static void bigsmp_setup_apic_routing(void)
46 {
47 printk(KERN_INFO
48 "Enabling APIC mode: Physflat. Using %d I/O APICs\n",
49 nr_ioapics);
50 }
51
bigsmp_cpu_present_to_apicid(int mps_cpu)52 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
53 {
54 if (mps_cpu < nr_cpu_ids)
55 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
56
57 return BAD_APICID;
58 }
59
bigsmp_ioapic_phys_id_map(physid_mask_t * phys_map,physid_mask_t * retmap)60 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
61 {
62 /* For clustered we don't have a good way to do this yet - hack */
63 physids_promote(0xFFL, retmap);
64 }
65
bigsmp_check_phys_apicid_present(int phys_apicid)66 static int bigsmp_check_phys_apicid_present(int phys_apicid)
67 {
68 return 1;
69 }
70
bigsmp_phys_pkg_id(int cpuid_apic,int index_msb)71 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
72 {
73 return cpuid_apic >> index_msb;
74 }
75
bigsmp_send_IPI_allbutself(int vector)76 static void bigsmp_send_IPI_allbutself(int vector)
77 {
78 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
79 }
80
bigsmp_send_IPI_all(int vector)81 static void bigsmp_send_IPI_all(int vector)
82 {
83 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
84 }
85
86 static int dmi_bigsmp; /* can be set by dmi scanners */
87
hp_ht_bigsmp(const struct dmi_system_id * d)88 static int hp_ht_bigsmp(const struct dmi_system_id *d)
89 {
90 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
91 dmi_bigsmp = 1;
92
93 return 0;
94 }
95
96
97 static const struct dmi_system_id bigsmp_dmi_table[] = {
98 { hp_ht_bigsmp, "HP ProLiant DL760 G2",
99 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
100 DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
101 }
102 },
103
104 { hp_ht_bigsmp, "HP ProLiant DL740",
105 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
106 DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
107 }
108 },
109 { } /* NULL entry stops DMI scanning */
110 };
111
probe_bigsmp(void)112 static int probe_bigsmp(void)
113 {
114 if (def_to_bigsmp)
115 dmi_bigsmp = 1;
116 else
117 dmi_check_system(bigsmp_dmi_table);
118
119 return dmi_bigsmp;
120 }
121
122 static struct apic apic_bigsmp __ro_after_init = {
123
124 .name = "bigsmp",
125 .probe = probe_bigsmp,
126 .acpi_madt_oem_check = NULL,
127 .apic_id_valid = default_apic_id_valid,
128 .apic_id_registered = bigsmp_apic_id_registered,
129
130 .delivery_mode = APIC_DELIVERY_MODE_FIXED,
131 .dest_mode_logical = false,
132
133 .disable_esr = 1,
134
135 .check_apicid_used = bigsmp_check_apicid_used,
136 .init_apic_ldr = bigsmp_init_apic_ldr,
137 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map,
138 .setup_apic_routing = bigsmp_setup_apic_routing,
139 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid,
140 .apicid_to_cpu_present = physid_set_mask_of_physid,
141 .check_phys_apicid_present = bigsmp_check_phys_apicid_present,
142 .phys_pkg_id = bigsmp_phys_pkg_id,
143
144 .get_apic_id = bigsmp_get_apic_id,
145 .set_apic_id = NULL,
146
147 .calc_dest_apicid = apic_default_calc_apicid,
148
149 .send_IPI = default_send_IPI_single_phys,
150 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
151 .send_IPI_mask_allbutself = NULL,
152 .send_IPI_allbutself = bigsmp_send_IPI_allbutself,
153 .send_IPI_all = bigsmp_send_IPI_all,
154 .send_IPI_self = default_send_IPI_self,
155
156 .inquire_remote_apic = default_inquire_remote_apic,
157
158 .read = native_apic_mem_read,
159 .write = native_apic_mem_write,
160 .eoi_write = native_apic_mem_write,
161 .icr_read = native_apic_icr_read,
162 .icr_write = native_apic_icr_write,
163 .wait_icr_idle = native_apic_wait_icr_idle,
164 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
165
166 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid,
167 };
168
generic_bigsmp_probe(void)169 void __init generic_bigsmp_probe(void)
170 {
171 unsigned int cpu;
172
173 if (!probe_bigsmp())
174 return;
175
176 apic = &apic_bigsmp;
177
178 for_each_possible_cpu(cpu) {
179 if (early_per_cpu(x86_cpu_to_logical_apicid,
180 cpu) == BAD_APICID)
181 continue;
182 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
183 bigsmp_early_logical_apicid(cpu);
184 }
185
186 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
187 }
188
189 apic_driver(apic_bigsmp);
190