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 unsigned bigsmp_get_apic_id(unsigned long x)
17{
18	return (x >> 24) & 0xFF;
19}
20
21static int bigsmp_apic_id_registered(void)
22{
23	return 1;
24}
25
26static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
27{
28	return false;
29}
30
31static 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 */
41static void bigsmp_init_apic_ldr(void)
42{
43}
44
45static 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
52static 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
60static 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
66static int bigsmp_check_phys_apicid_present(int phys_apicid)
67{
68	return 1;
69}
70
71static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
72{
73	return cpuid_apic >> index_msb;
74}
75
76static void bigsmp_send_IPI_allbutself(int vector)
77{
78	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
79}
80
81static void bigsmp_send_IPI_all(int vector)
82{
83	default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
84}
85
86static int dmi_bigsmp; /* can be set by dmi scanners */
87
88static 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
97static 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
112static 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
122static 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	.irq_delivery_mode		= dest_Fixed,
131	/* phys delivery to target CPU: */
132	.irq_dest_mode			= 0,
133
134	.disable_esr			= 1,
135	.dest_logical			= 0,
136	.check_apicid_used		= bigsmp_check_apicid_used,
137
138	.init_apic_ldr			= bigsmp_init_apic_ldr,
139
140	.ioapic_phys_id_map		= bigsmp_ioapic_phys_id_map,
141	.setup_apic_routing		= bigsmp_setup_apic_routing,
142	.cpu_present_to_apicid		= bigsmp_cpu_present_to_apicid,
143	.apicid_to_cpu_present		= physid_set_mask_of_physid,
144	.check_phys_apicid_present	= bigsmp_check_phys_apicid_present,
145	.phys_pkg_id			= bigsmp_phys_pkg_id,
146
147	.get_apic_id			= bigsmp_get_apic_id,
148	.set_apic_id			= NULL,
149
150	.calc_dest_apicid		= apic_default_calc_apicid,
151
152	.send_IPI			= default_send_IPI_single_phys,
153	.send_IPI_mask			= default_send_IPI_mask_sequence_phys,
154	.send_IPI_mask_allbutself	= NULL,
155	.send_IPI_allbutself		= bigsmp_send_IPI_allbutself,
156	.send_IPI_all			= bigsmp_send_IPI_all,
157	.send_IPI_self			= default_send_IPI_self,
158
159	.inquire_remote_apic		= default_inquire_remote_apic,
160
161	.read				= native_apic_mem_read,
162	.write				= native_apic_mem_write,
163	.eoi_write			= native_apic_mem_write,
164	.icr_read			= native_apic_icr_read,
165	.icr_write			= native_apic_icr_write,
166	.wait_icr_idle			= native_apic_wait_icr_idle,
167	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
168
169	.x86_32_early_logical_apicid	= bigsmp_early_logical_apicid,
170};
171
172void __init generic_bigsmp_probe(void)
173{
174	unsigned int cpu;
175
176	if (!probe_bigsmp())
177		return;
178
179	apic = &apic_bigsmp;
180
181	for_each_possible_cpu(cpu) {
182		if (early_per_cpu(x86_cpu_to_logical_apicid,
183				  cpu) == BAD_APICID)
184			continue;
185		early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
186			bigsmp_early_logical_apicid(cpu);
187	}
188
189	pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
190}
191
192apic_driver(apic_bigsmp);
193