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_check_apicid_used(physid_mask_t * map,int apicid)21 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
22 {
23 return false;
24 }
25
bigsmp_ioapic_phys_id_map(physid_mask_t * phys_map,physid_mask_t * retmap)26 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
27 {
28 /* For clustered we don't have a good way to do this yet - hack */
29 physids_promote(0xFFL, retmap);
30 }
31
bigsmp_phys_pkg_id(int cpuid_apic,int index_msb)32 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
33 {
34 return cpuid_apic >> index_msb;
35 }
36
bigsmp_send_IPI_allbutself(int vector)37 static void bigsmp_send_IPI_allbutself(int vector)
38 {
39 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
40 }
41
bigsmp_send_IPI_all(int vector)42 static void bigsmp_send_IPI_all(int vector)
43 {
44 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
45 }
46
47 static int dmi_bigsmp; /* can be set by dmi scanners */
48
hp_ht_bigsmp(const struct dmi_system_id * d)49 static int hp_ht_bigsmp(const struct dmi_system_id *d)
50 {
51 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
52 dmi_bigsmp = 1;
53
54 return 0;
55 }
56
57
58 static const struct dmi_system_id bigsmp_dmi_table[] = {
59 { hp_ht_bigsmp, "HP ProLiant DL760 G2",
60 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
61 DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
62 }
63 },
64
65 { hp_ht_bigsmp, "HP ProLiant DL740",
66 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
67 DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
68 }
69 },
70 { } /* NULL entry stops DMI scanning */
71 };
72
probe_bigsmp(void)73 static int probe_bigsmp(void)
74 {
75 return dmi_check_system(bigsmp_dmi_table);
76 }
77
78 static struct apic apic_bigsmp __ro_after_init = {
79
80 .name = "bigsmp",
81 .probe = probe_bigsmp,
82
83 .delivery_mode = APIC_DELIVERY_MODE_FIXED,
84 .dest_mode_logical = false,
85
86 .disable_esr = 1,
87
88 .check_apicid_used = bigsmp_check_apicid_used,
89 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map,
90 .cpu_present_to_apicid = default_cpu_present_to_apicid,
91 .phys_pkg_id = bigsmp_phys_pkg_id,
92
93 .max_apic_id = 0xFE,
94 .get_apic_id = bigsmp_get_apic_id,
95 .set_apic_id = NULL,
96
97 .calc_dest_apicid = apic_default_calc_apicid,
98
99 .send_IPI = default_send_IPI_single_phys,
100 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
101 .send_IPI_mask_allbutself = NULL,
102 .send_IPI_allbutself = bigsmp_send_IPI_allbutself,
103 .send_IPI_all = bigsmp_send_IPI_all,
104 .send_IPI_self = default_send_IPI_self,
105
106 .read = native_apic_mem_read,
107 .write = native_apic_mem_write,
108 .eoi = native_apic_mem_eoi,
109 .icr_read = native_apic_icr_read,
110 .icr_write = native_apic_icr_write,
111 .wait_icr_idle = apic_mem_wait_icr_idle,
112 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout,
113 };
114
apic_bigsmp_possible(bool cmdline_override)115 bool __init apic_bigsmp_possible(bool cmdline_override)
116 {
117 return apic == &apic_bigsmp || !cmdline_override;
118 }
119
apic_bigsmp_force(void)120 void __init apic_bigsmp_force(void)
121 {
122 if (apic != &apic_bigsmp)
123 apic_install_driver(&apic_bigsmp);
124 }
125
126 apic_driver(apic_bigsmp);
127