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 16 static unsigned bigsmp_get_apic_id(unsigned long x) 17 { 18 return (x >> 24) & 0xFF; 19 } 20 21 static int bigsmp_apic_id_registered(void) 22 { 23 return 1; 24 } 25 26 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid) 27 { 28 return false; 29 } 30 31 static 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 */ 41 static void bigsmp_init_apic_ldr(void) 42 { 43 } 44 45 static 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 52 static 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 60 static 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 66 static int bigsmp_check_phys_apicid_present(int phys_apicid) 67 { 68 return 1; 69 } 70 71 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb) 72 { 73 return cpuid_apic >> index_msb; 74 } 75 76 static void bigsmp_send_IPI_allbutself(int vector) 77 { 78 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 79 } 80 81 static void bigsmp_send_IPI_all(int vector) 82 { 83 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 84 } 85 86 static int dmi_bigsmp; /* can be set by dmi scanners */ 87 88 static 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 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-"), 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 }; 111 112 static 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 } 121 122 static 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 .delivery_mode = APIC_DELIVERY_MODE_FIXED, 131 .dest_mode_logical = false, 132 133 .disable_esr = 1, 134 135 .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, 143 144 .get_apic_id = bigsmp_get_apic_id, 145 .set_apic_id = NULL, 146 147 .calc_dest_apicid = apic_default_calc_apicid, 148 149 .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, 155 156 .inquire_remote_apic = default_inquire_remote_apic, 157 158 .read = native_apic_mem_read, 159 .write = native_apic_mem_write, 160 .eoi_write = native_apic_mem_write, 161 .icr_read = native_apic_icr_read, 162 .icr_write = native_apic_icr_write, 163 .wait_icr_idle = native_apic_wait_icr_idle, 164 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 165 166 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid, 167 }; 168 169 void __init generic_bigsmp_probe(void) 170 { 171 unsigned int cpu; 172 173 if (!probe_bigsmp()) 174 return; 175 176 apic = &apic_bigsmp; 177 178 for_each_possible_cpu(cpu) { 179 if (early_per_cpu(x86_cpu_to_logical_apicid, 180 cpu) == BAD_APICID) 181 continue; 182 early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 183 bigsmp_early_logical_apicid(cpu); 184 } 185 186 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name); 187 } 188 189 apic_driver(apic_bigsmp); 190