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 /* 32 * bigsmp enables physical destination mode 33 * and doesn't use LDR and DFR 34 */ 35 static void bigsmp_init_apic_ldr(void) 36 { 37 } 38 39 static void bigsmp_setup_apic_routing(void) 40 { 41 printk(KERN_INFO 42 "Enabling APIC mode: Physflat. Using %d I/O APICs\n", 43 nr_ioapics); 44 } 45 46 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap) 47 { 48 /* For clustered we don't have a good way to do this yet - hack */ 49 physids_promote(0xFFL, retmap); 50 } 51 52 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb) 53 { 54 return cpuid_apic >> index_msb; 55 } 56 57 static void bigsmp_send_IPI_allbutself(int vector) 58 { 59 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 60 } 61 62 static void bigsmp_send_IPI_all(int vector) 63 { 64 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 65 } 66 67 static int dmi_bigsmp; /* can be set by dmi scanners */ 68 69 static int hp_ht_bigsmp(const struct dmi_system_id *d) 70 { 71 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 72 dmi_bigsmp = 1; 73 74 return 0; 75 } 76 77 78 static const struct dmi_system_id bigsmp_dmi_table[] = { 79 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 80 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 81 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 82 } 83 }, 84 85 { hp_ht_bigsmp, "HP ProLiant DL740", 86 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 87 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 88 } 89 }, 90 { } /* NULL entry stops DMI scanning */ 91 }; 92 93 static int probe_bigsmp(void) 94 { 95 return dmi_check_system(bigsmp_dmi_table); 96 } 97 98 static struct apic apic_bigsmp __ro_after_init = { 99 100 .name = "bigsmp", 101 .probe = probe_bigsmp, 102 .apic_id_valid = default_apic_id_valid, 103 .apic_id_registered = bigsmp_apic_id_registered, 104 105 .delivery_mode = APIC_DELIVERY_MODE_FIXED, 106 .dest_mode_logical = false, 107 108 .disable_esr = 1, 109 110 .check_apicid_used = bigsmp_check_apicid_used, 111 .init_apic_ldr = bigsmp_init_apic_ldr, 112 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, 113 .setup_apic_routing = bigsmp_setup_apic_routing, 114 .cpu_present_to_apicid = default_cpu_present_to_apicid, 115 .apicid_to_cpu_present = physid_set_mask_of_physid, 116 .phys_pkg_id = bigsmp_phys_pkg_id, 117 118 .get_apic_id = bigsmp_get_apic_id, 119 .set_apic_id = NULL, 120 121 .calc_dest_apicid = apic_default_calc_apicid, 122 123 .send_IPI = default_send_IPI_single_phys, 124 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 125 .send_IPI_mask_allbutself = NULL, 126 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 127 .send_IPI_all = bigsmp_send_IPI_all, 128 .send_IPI_self = default_send_IPI_self, 129 130 .read = native_apic_mem_read, 131 .write = native_apic_mem_write, 132 .eoi_write = native_apic_mem_write, 133 .icr_read = native_apic_icr_read, 134 .icr_write = native_apic_icr_write, 135 .wait_icr_idle = native_apic_wait_icr_idle, 136 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 137 }; 138 139 bool __init apic_bigsmp_possible(bool cmdline_override) 140 { 141 return apic == &apic_bigsmp || !cmdline_override; 142 } 143 144 void __init apic_bigsmp_force(void) 145 { 146 if (apic != &apic_bigsmp) { 147 apic = &apic_bigsmp; 148 pr_info("Overriding APIC driver with bigsmp\n"); 149 } 150 } 151 152 apic_driver(apic_bigsmp); 153