1 // SPDX-License-Identifier: GPL-2.0
3 * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
5 * Drives the local APIC in "clustered mode".
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>
14 #include <asm/apicdef.h>
15 #include <asm/fixmap.h>
16 #include <asm/mpspec.h>
20 static unsigned bigsmp_get_apic_id(unsigned long x)
22 return (x >> 24) & 0xFF;
25 static int bigsmp_apic_id_registered(void)
30 static unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
35 static int bigsmp_early_logical_apicid(int cpu)
37 /* on bigsmp, logical apicid is the same as physical */
38 return early_per_cpu(x86_cpu_to_apicid, cpu);
42 * bigsmp enables physical destination mode
43 * and doesn't use LDR and DFR
45 static void bigsmp_init_apic_ldr(void)
49 static void bigsmp_setup_apic_routing(void)
52 "Enabling APIC mode: Physflat. Using %d I/O APICs\n",
56 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
58 if (mps_cpu < nr_cpu_ids)
59 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
64 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
66 /* For clustered we don't have a good way to do this yet - hack */
67 physids_promote(0xFFL, retmap);
70 static int bigsmp_check_phys_apicid_present(int phys_apicid)
75 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
77 return cpuid_apic >> index_msb;
80 static void bigsmp_send_IPI_allbutself(int vector)
82 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
85 static void bigsmp_send_IPI_all(int vector)
87 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
90 static int dmi_bigsmp; /* can be set by dmi scanners */
92 static int hp_ht_bigsmp(const struct dmi_system_id *d)
94 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
101 static const struct dmi_system_id bigsmp_dmi_table[] = {
102 { hp_ht_bigsmp, "HP ProLiant DL760 G2",
103 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
104 DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
108 { hp_ht_bigsmp, "HP ProLiant DL740",
109 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
110 DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
113 { } /* NULL entry stops DMI scanning */
116 static int probe_bigsmp(void)
121 dmi_check_system(bigsmp_dmi_table);
126 static struct apic apic_bigsmp __ro_after_init = {
129 .probe = probe_bigsmp,
130 .acpi_madt_oem_check = NULL,
131 .apic_id_valid = default_apic_id_valid,
132 .apic_id_registered = bigsmp_apic_id_registered,
134 .irq_delivery_mode = dest_Fixed,
135 /* phys delivery to target CPU: */
138 .target_cpus = default_target_cpus,
141 .check_apicid_used = bigsmp_check_apicid_used,
143 .vector_allocation_domain = default_vector_allocation_domain,
144 .init_apic_ldr = bigsmp_init_apic_ldr,
146 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map,
147 .setup_apic_routing = bigsmp_setup_apic_routing,
148 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid,
149 .apicid_to_cpu_present = physid_set_mask_of_physid,
150 .check_phys_apicid_present = bigsmp_check_phys_apicid_present,
151 .phys_pkg_id = bigsmp_phys_pkg_id,
153 .get_apic_id = bigsmp_get_apic_id,
156 .cpu_mask_to_apicid = default_cpu_mask_to_apicid,
158 .send_IPI = default_send_IPI_single_phys,
159 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
160 .send_IPI_mask_allbutself = NULL,
161 .send_IPI_allbutself = bigsmp_send_IPI_allbutself,
162 .send_IPI_all = bigsmp_send_IPI_all,
163 .send_IPI_self = default_send_IPI_self,
165 .inquire_remote_apic = default_inquire_remote_apic,
167 .read = native_apic_mem_read,
168 .write = native_apic_mem_write,
169 .eoi_write = native_apic_mem_write,
170 .icr_read = native_apic_icr_read,
171 .icr_write = native_apic_icr_write,
172 .wait_icr_idle = native_apic_wait_icr_idle,
173 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
175 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid,
178 void __init generic_bigsmp_probe(void)
187 for_each_possible_cpu(cpu) {
188 if (early_per_cpu(x86_cpu_to_logical_apicid,
191 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
192 bigsmp_early_logical_apicid(cpu);
195 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
198 apic_driver(apic_bigsmp);