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 u32 bigsmp_get_apic_id(u32 x) 17 { 18 return (x >> 24) & 0xFF; 19 } 20 21 static void bigsmp_send_IPI_allbutself(int vector) 22 { 23 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 24 } 25 26 static void bigsmp_send_IPI_all(int vector) 27 { 28 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 29 } 30 31 static int dmi_bigsmp; /* can be set by dmi scanners */ 32 33 static int hp_ht_bigsmp(const struct dmi_system_id *d) 34 { 35 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 36 dmi_bigsmp = 1; 37 38 return 0; 39 } 40 41 42 static const struct dmi_system_id bigsmp_dmi_table[] = { 43 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 44 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 45 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 46 } 47 }, 48 49 { hp_ht_bigsmp, "HP ProLiant DL740", 50 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 51 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 52 } 53 }, 54 { } /* NULL entry stops DMI scanning */ 55 }; 56 57 static int probe_bigsmp(void) 58 { 59 return dmi_check_system(bigsmp_dmi_table); 60 } 61 62 static struct apic apic_bigsmp __ro_after_init = { 63 64 .name = "bigsmp", 65 .probe = probe_bigsmp, 66 67 .dest_mode_logical = false, 68 69 .disable_esr = 1, 70 71 .cpu_present_to_apicid = default_cpu_present_to_apicid, 72 73 .max_apic_id = 0xFE, 74 .get_apic_id = bigsmp_get_apic_id, 75 76 .calc_dest_apicid = apic_default_calc_apicid, 77 78 .send_IPI = default_send_IPI_single_phys, 79 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 80 .send_IPI_mask_allbutself = NULL, 81 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 82 .send_IPI_all = bigsmp_send_IPI_all, 83 .send_IPI_self = default_send_IPI_self, 84 85 .read = native_apic_mem_read, 86 .write = native_apic_mem_write, 87 .eoi = native_apic_mem_eoi, 88 .icr_read = native_apic_icr_read, 89 .icr_write = native_apic_icr_write, 90 .wait_icr_idle = apic_mem_wait_icr_idle, 91 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout, 92 }; 93 94 bool __init apic_bigsmp_possible(bool cmdline_override) 95 { 96 return apic == &apic_bigsmp || !cmdline_override; 97 } 98 99 void __init apic_bigsmp_force(void) 100 { 101 if (apic != &apic_bigsmp) 102 apic_install_driver(&apic_bigsmp); 103 } 104 105 apic_driver(apic_bigsmp); 106