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 15 static unsigned bigsmp_get_apic_id(unsigned long x) 16 { 17 return (x >> 24) & 0xFF; 18 } 19 20 static int bigsmp_apic_id_registered(void) 21 { 22 return 1; 23 } 24 25 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid) 26 { 27 return false; 28 } 29 30 static 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 */ 40 static void bigsmp_init_apic_ldr(void) 41 { 42 } 43 44 static 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 51 static 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 59 static 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 65 static int bigsmp_check_phys_apicid_present(int phys_apicid) 66 { 67 return 1; 68 } 69 70 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb) 71 { 72 return cpuid_apic >> index_msb; 73 } 74 75 static void bigsmp_send_IPI_allbutself(int vector) 76 { 77 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 78 } 79 80 static void bigsmp_send_IPI_all(int vector) 81 { 82 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 83 } 84 85 static int dmi_bigsmp; /* can be set by dmi scanners */ 86 87 static 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 96 static 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 }; 110 111 static 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 } 120 121 static 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 }; 170 171 void __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 } 190 191 apic_driver(apic_bigsmp); 192