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 | |
16 | static u32 bigsmp_get_apic_id(u32 x) |
17 | { |
18 | return (x >> 24) & 0xFF; |
19 | } |
20 | |
21 | static void bigsmp_send_IPI_allbutself(int vector) |
22 | { |
23 | default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); |
24 | } |
25 | |
26 | static void bigsmp_send_IPI_all(int vector) |
27 | { |
28 | default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); |
29 | } |
30 | |
31 | static int dmi_bigsmp; /* can be set by dmi scanners */ |
32 | |
33 | static 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 | |
42 | static 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 | |
57 | static int probe_bigsmp(void) |
58 | { |
59 | return dmi_check_system(list: bigsmp_dmi_table); |
60 | } |
61 | |
62 | static 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 | |
94 | bool __init apic_bigsmp_possible(bool cmdline_override) |
95 | { |
96 | return apic == &apic_bigsmp || !cmdline_override; |
97 | } |
98 | |
99 | void __init apic_bigsmp_force(void) |
100 | { |
101 | if (apic != &apic_bigsmp) |
102 | apic_install_driver(driver: &apic_bigsmp); |
103 | } |
104 | |
105 | apic_driver(apic_bigsmp); |
106 | |