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);
106