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