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_cpu_to_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_phys_pkg_id(int cpuid_apic, int index_msb) 67 { 68 return cpuid_apic >> index_msb; 69 } 70 71 static void bigsmp_send_IPI_allbutself(int vector) 72 { 73 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 74 } 75 76 static void bigsmp_send_IPI_all(int vector) 77 { 78 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 79 } 80 81 static int dmi_bigsmp; /* can be set by dmi scanners */ 82 83 static int hp_ht_bigsmp(const struct dmi_system_id *d) 84 { 85 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 86 dmi_bigsmp = 1; 87 88 return 0; 89 } 90 91 92 static const struct dmi_system_id bigsmp_dmi_table[] = { 93 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 94 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 95 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 96 } 97 }, 98 99 { hp_ht_bigsmp, "HP ProLiant DL740", 100 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 101 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 102 } 103 }, 104 { } /* NULL entry stops DMI scanning */ 105 }; 106 107 static int probe_bigsmp(void) 108 { 109 if (def_to_bigsmp) 110 dmi_bigsmp = 1; 111 else 112 dmi_check_system(bigsmp_dmi_table); 113 114 return dmi_bigsmp; 115 } 116 117 static struct apic apic_bigsmp __ro_after_init = { 118 119 .name = "bigsmp", 120 .probe = probe_bigsmp, 121 .acpi_madt_oem_check = NULL, 122 .apic_id_valid = default_apic_id_valid, 123 .apic_id_registered = bigsmp_apic_id_registered, 124 125 .delivery_mode = APIC_DELIVERY_MODE_FIXED, 126 .dest_mode_logical = false, 127 128 .disable_esr = 1, 129 130 .check_apicid_used = bigsmp_check_apicid_used, 131 .init_apic_ldr = bigsmp_init_apic_ldr, 132 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, 133 .setup_apic_routing = bigsmp_setup_apic_routing, 134 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid, 135 .apicid_to_cpu_present = physid_set_mask_of_physid, 136 .phys_pkg_id = bigsmp_phys_pkg_id, 137 138 .get_apic_id = bigsmp_get_apic_id, 139 .set_apic_id = NULL, 140 141 .calc_dest_apicid = apic_default_calc_apicid, 142 143 .send_IPI = default_send_IPI_single_phys, 144 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 145 .send_IPI_mask_allbutself = NULL, 146 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 147 .send_IPI_all = bigsmp_send_IPI_all, 148 .send_IPI_self = default_send_IPI_self, 149 150 .read = native_apic_mem_read, 151 .write = native_apic_mem_write, 152 .eoi_write = native_apic_mem_write, 153 .icr_read = native_apic_icr_read, 154 .icr_write = native_apic_icr_write, 155 .wait_icr_idle = native_apic_wait_icr_idle, 156 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 157 158 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid, 159 }; 160 161 void __init generic_bigsmp_probe(void) 162 { 163 unsigned int cpu; 164 165 if (!probe_bigsmp()) 166 return; 167 168 apic = &apic_bigsmp; 169 170 for_each_possible_cpu(cpu) { 171 if (early_per_cpu(x86_cpu_to_logical_apicid, 172 cpu) == BAD_APICID) 173 continue; 174 early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 175 bigsmp_early_logical_apicid(cpu); 176 } 177 178 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name); 179 } 180 181 apic_driver(apic_bigsmp); 182