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/cpumask.h>
12 #include <asm/io_apic.h>
16 static unsigned bigsmp_get_apic_id(unsigned long x)
18 return (x >> 24) & 0xFF;
21 static int bigsmp_apic_id_registered(void)
26 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
31 static int bigsmp_early_logical_apicid(int cpu)
33 /* on bigsmp, logical apicid is the same as physical */
34 return early_per_cpu(x86_cpu_to_apicid, cpu);
38 * bigsmp enables physical destination mode
39 * and doesn't use LDR and DFR
41 static void bigsmp_init_apic_ldr(void)
45 static void bigsmp_setup_apic_routing(void)
48 "Enabling APIC mode: Physflat. Using %d I/O APICs\n",
52 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
54 if (mps_cpu < nr_cpu_ids)
55 return (int) per_cpu(x86_cpu_to_apicid, mps_cpu);
60 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
62 /* For clustered we don't have a good way to do this yet - hack */
63 physids_promote(0xFFL, retmap);
66 static int bigsmp_check_phys_apicid_present(int phys_apicid)
71 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
73 return cpuid_apic >> index_msb;
76 static void bigsmp_send_IPI_allbutself(int vector)
78 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
81 static void bigsmp_send_IPI_all(int vector)
83 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
86 static int dmi_bigsmp; /* can be set by dmi scanners */
88 static int hp_ht_bigsmp(const struct dmi_system_id *d)
90 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
97 static 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-"),
104 { hp_ht_bigsmp, "HP ProLiant DL740",
105 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
106 DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
109 { } /* NULL entry stops DMI scanning */
112 static int probe_bigsmp(void)
117 dmi_check_system(bigsmp_dmi_table);
122 static struct apic apic_bigsmp __ro_after_init = {
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,
130 .delivery_mode = APIC_DELIVERY_MODE_FIXED,
131 .dest_mode_logical = false,
135 .check_apicid_used = bigsmp_check_apicid_used,
136 .init_apic_ldr = bigsmp_init_apic_ldr,
137 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map,
138 .setup_apic_routing = bigsmp_setup_apic_routing,
139 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid,
140 .apicid_to_cpu_present = physid_set_mask_of_physid,
141 .check_phys_apicid_present = bigsmp_check_phys_apicid_present,
142 .phys_pkg_id = bigsmp_phys_pkg_id,
144 .get_apic_id = bigsmp_get_apic_id,
147 .calc_dest_apicid = apic_default_calc_apicid,
149 .send_IPI = default_send_IPI_single_phys,
150 .send_IPI_mask = default_send_IPI_mask_sequence_phys,
151 .send_IPI_mask_allbutself = NULL,
152 .send_IPI_allbutself = bigsmp_send_IPI_allbutself,
153 .send_IPI_all = bigsmp_send_IPI_all,
154 .send_IPI_self = default_send_IPI_self,
156 .read = native_apic_mem_read,
157 .write = native_apic_mem_write,
158 .eoi_write = native_apic_mem_write,
159 .icr_read = native_apic_icr_read,
160 .icr_write = native_apic_icr_write,
161 .wait_icr_idle = native_apic_wait_icr_idle,
162 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
164 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid,
167 void __init generic_bigsmp_probe(void)
176 for_each_possible_cpu(cpu) {
177 if (early_per_cpu(x86_cpu_to_logical_apicid,
180 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
181 bigsmp_early_logical_apicid(cpu);
184 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
187 apic_driver(apic_bigsmp);