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
 13#include "local.h"
 14
 15static unsigned bigsmp_get_apic_id(unsigned long x)
 16{
 17	return (x >> 24) & 0xFF;
 18}
 19
 20static int bigsmp_apic_id_registered(void)
 21{
 22	return 1;
 23}
 24
 25static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
 26{
 27	return false;
 28}
 29
 30static int bigsmp_early_logical_apicid(int cpu)
 31{
 32	/* on bigsmp, logical apicid is the same as physical */
 33	return early_per_cpu(x86_cpu_to_apicid, cpu);
 34}
 35
 36/*
 37 * bigsmp enables physical destination mode
 38 * and doesn't use LDR and DFR
 39 */
 40static void bigsmp_init_apic_ldr(void)
 41{
 42}
 43
 44static void bigsmp_setup_apic_routing(void)
 45{
 46	printk(KERN_INFO
 47		"Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
 48		nr_ioapics);
 49}
 50
 51static int bigsmp_cpu_present_to_apicid(int mps_cpu)
 52{
 53	if (mps_cpu < nr_cpu_ids)
 54		return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
 55
 56	return BAD_APICID;
 57}
 58
 59static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
 60{
 61	/* For clustered we don't have a good way to do this yet - hack */
 62	physids_promote(0xFFL, retmap);
 63}
 64
 65static int bigsmp_check_phys_apicid_present(int phys_apicid)
 66{
 67	return 1;
 68}
 69
 70static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
 71{
 72	return cpuid_apic >> index_msb;
 73}
 74
 75static void bigsmp_send_IPI_allbutself(int vector)
 76{
 77	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 78}
 79
 80static void bigsmp_send_IPI_all(int vector)
 81{
 82	default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
 83}
 84
 85static int dmi_bigsmp; /* can be set by dmi scanners */
 86
 87static int hp_ht_bigsmp(const struct dmi_system_id *d)
 88{
 89	printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
 90	dmi_bigsmp = 1;
 91
 92	return 0;
 93}
 94
 95
 96static const struct dmi_system_id bigsmp_dmi_table[] = {
 97	{ hp_ht_bigsmp, "HP ProLiant DL760 G2",
 98		{	DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 99			DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
100		}
101	},
102
103	{ hp_ht_bigsmp, "HP ProLiant DL740",
104		{	DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
105			DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
106		}
107	},
108	{ } /* NULL entry stops DMI scanning */
109};
110
111static int probe_bigsmp(void)
112{
113	if (def_to_bigsmp)
114		dmi_bigsmp = 1;
115	else
116		dmi_check_system(bigsmp_dmi_table);
117
118	return dmi_bigsmp;
119}
120
121static struct apic apic_bigsmp __ro_after_init = {
122
123	.name				= "bigsmp",
124	.probe				= probe_bigsmp,
125	.acpi_madt_oem_check		= NULL,
126	.apic_id_valid			= default_apic_id_valid,
127	.apic_id_registered		= bigsmp_apic_id_registered,
128
129	.irq_delivery_mode		= dest_Fixed,
130	/* phys delivery to target CPU: */
131	.irq_dest_mode			= 0,
132
133	.disable_esr			= 1,
134	.dest_logical			= 0,
135	.check_apicid_used		= bigsmp_check_apicid_used,
136
137	.init_apic_ldr			= bigsmp_init_apic_ldr,
138
139	.ioapic_phys_id_map		= bigsmp_ioapic_phys_id_map,
140	.setup_apic_routing		= bigsmp_setup_apic_routing,
141	.cpu_present_to_apicid		= bigsmp_cpu_present_to_apicid,
142	.apicid_to_cpu_present		= physid_set_mask_of_physid,
143	.check_phys_apicid_present	= bigsmp_check_phys_apicid_present,
144	.phys_pkg_id			= bigsmp_phys_pkg_id,
145
 
146	.get_apic_id			= bigsmp_get_apic_id,
147	.set_apic_id			= NULL,
148
149	.calc_dest_apicid		= apic_default_calc_apicid,
150
151	.send_IPI			= default_send_IPI_single_phys,
152	.send_IPI_mask			= default_send_IPI_mask_sequence_phys,
153	.send_IPI_mask_allbutself	= NULL,
154	.send_IPI_allbutself		= bigsmp_send_IPI_allbutself,
155	.send_IPI_all			= bigsmp_send_IPI_all,
156	.send_IPI_self			= default_send_IPI_self,
157
158	.inquire_remote_apic		= default_inquire_remote_apic,
159
160	.read				= native_apic_mem_read,
161	.write				= native_apic_mem_write,
162	.eoi_write			= native_apic_mem_write,
163	.icr_read			= native_apic_icr_read,
164	.icr_write			= native_apic_icr_write,
165	.wait_icr_idle			= native_apic_wait_icr_idle,
166	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
167
168	.x86_32_early_logical_apicid	= bigsmp_early_logical_apicid,
169};
170
171void __init generic_bigsmp_probe(void)
172{
173	unsigned int cpu;
174
175	if (!probe_bigsmp())
176		return;
177
178	apic = &apic_bigsmp;
179
180	for_each_possible_cpu(cpu) {
181		if (early_per_cpu(x86_cpu_to_logical_apicid,
182				  cpu) == BAD_APICID)
183			continue;
184		early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
185			bigsmp_early_logical_apicid(cpu);
186	}
187
188	pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
 
 
 
189}
190
191apic_driver(apic_bigsmp);

  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);