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