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/threads.h>
  8#include <linux/cpumask.h>
  9#include <linux/kernel.h>
 10#include <linux/init.h>
 11#include <linux/dmi.h>
 12#include <linux/smp.h>
 13
 14#include <asm/apicdef.h>
 15#include <asm/fixmap.h>
 16#include <asm/mpspec.h>
 17#include <asm/apic.h>
 18#include <asm/ipi.h>
 
 19
 20static unsigned bigsmp_get_apic_id(unsigned long x)
 21{
 22	return (x >> 24) & 0xFF;
 23}
 24
 25static int bigsmp_apic_id_registered(void)
 26{
 27	return 1;
 28}
 29
 30static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
 31{
 32	return false;
 33}
 34
 35static int bigsmp_early_logical_apicid(int cpu)
 36{
 37	/* on bigsmp, logical apicid is the same as physical */
 38	return early_per_cpu(x86_cpu_to_apicid, cpu);
 39}
 40
 41static inline unsigned long calculate_ldr(int cpu)
 42{
 43	unsigned long val, id;
 44
 45	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 46	id = per_cpu(x86_bios_cpu_apicid, cpu);
 47	val |= SET_APIC_LOGICAL_ID(id);
 48
 49	return val;
 50}
 51
 52/*
 53 * Set up the logical destination ID.
 54 *
 55 * Intel recommends to set DFR, LDR and TPR before enabling
 56 * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
 57 * document number 292116).  So here it goes...
 58 */
 59static void bigsmp_init_apic_ldr(void)
 60{
 61	unsigned long val;
 62	int cpu = smp_processor_id();
 63
 64	apic_write(APIC_DFR, APIC_DFR_FLAT);
 65	val = calculate_ldr(cpu);
 66	apic_write(APIC_LDR, val);
 67}
 68
 69static void bigsmp_setup_apic_routing(void)
 70{
 71	printk(KERN_INFO
 72		"Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
 73		nr_ioapics);
 74}
 75
 76static int bigsmp_cpu_present_to_apicid(int mps_cpu)
 77{
 78	if (mps_cpu < nr_cpu_ids)
 79		return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
 80
 81	return BAD_APICID;
 82}
 83
 84static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
 85{
 86	/* For clustered we don't have a good way to do this yet - hack */
 87	physids_promote(0xFFL, retmap);
 88}
 89
 90static int bigsmp_check_phys_apicid_present(int phys_apicid)
 91{
 92	return 1;
 93}
 94
 95static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
 96{
 97	return cpuid_apic >> index_msb;
 98}
 99
100static void bigsmp_send_IPI_allbutself(int vector)
101{
102	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
103}
104
105static void bigsmp_send_IPI_all(int vector)
106{
107	default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
108}
109
110static int dmi_bigsmp; /* can be set by dmi scanners */
111
112static int hp_ht_bigsmp(const struct dmi_system_id *d)
113{
114	printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
115	dmi_bigsmp = 1;
116
117	return 0;
118}
119
120
121static const struct dmi_system_id bigsmp_dmi_table[] = {
122	{ hp_ht_bigsmp, "HP ProLiant DL760 G2",
123		{	DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
124			DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
125		}
126	},
127
128	{ hp_ht_bigsmp, "HP ProLiant DL740",
129		{	DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
130			DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
131		}
132	},
133	{ } /* NULL entry stops DMI scanning */
134};
135
136static int probe_bigsmp(void)
137{
138	if (def_to_bigsmp)
139		dmi_bigsmp = 1;
140	else
141		dmi_check_system(bigsmp_dmi_table);
142
143	return dmi_bigsmp;
144}
145
146static struct apic apic_bigsmp __ro_after_init = {
147
148	.name				= "bigsmp",
149	.probe				= probe_bigsmp,
150	.acpi_madt_oem_check		= NULL,
151	.apic_id_valid			= default_apic_id_valid,
152	.apic_id_registered		= bigsmp_apic_id_registered,
153
154	.irq_delivery_mode		= dest_Fixed,
155	/* phys delivery to target CPU: */
156	.irq_dest_mode			= 0,
157
158	.disable_esr			= 1,
159	.dest_logical			= 0,
160	.check_apicid_used		= bigsmp_check_apicid_used,
161
162	.init_apic_ldr			= bigsmp_init_apic_ldr,
163
164	.ioapic_phys_id_map		= bigsmp_ioapic_phys_id_map,
165	.setup_apic_routing		= bigsmp_setup_apic_routing,
166	.cpu_present_to_apicid		= bigsmp_cpu_present_to_apicid,
167	.apicid_to_cpu_present		= physid_set_mask_of_physid,
168	.check_phys_apicid_present	= bigsmp_check_phys_apicid_present,
169	.phys_pkg_id			= bigsmp_phys_pkg_id,
170
171	.get_apic_id			= bigsmp_get_apic_id,
172	.set_apic_id			= NULL,
173
174	.calc_dest_apicid		= apic_default_calc_apicid,
175
176	.send_IPI			= default_send_IPI_single_phys,
177	.send_IPI_mask			= default_send_IPI_mask_sequence_phys,
178	.send_IPI_mask_allbutself	= NULL,
179	.send_IPI_allbutself		= bigsmp_send_IPI_allbutself,
180	.send_IPI_all			= bigsmp_send_IPI_all,
181	.send_IPI_self			= default_send_IPI_self,
182
183	.inquire_remote_apic		= default_inquire_remote_apic,
184
185	.read				= native_apic_mem_read,
186	.write				= native_apic_mem_write,
187	.eoi_write			= native_apic_mem_write,
188	.icr_read			= native_apic_icr_read,
189	.icr_write			= native_apic_icr_write,
190	.wait_icr_idle			= native_apic_wait_icr_idle,
191	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
192
193	.x86_32_early_logical_apicid	= bigsmp_early_logical_apicid,
194};
195
196void __init generic_bigsmp_probe(void)
197{
198	unsigned int cpu;
199
200	if (!probe_bigsmp())
201		return;
202
203	apic = &apic_bigsmp;
204
205	for_each_possible_cpu(cpu) {
206		if (early_per_cpu(x86_cpu_to_logical_apicid,
207				  cpu) == BAD_APICID)
208			continue;
209		early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
210			bigsmp_early_logical_apicid(cpu);
211	}
212
213	pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
214}
215
216apic_driver(apic_bigsmp);