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 bool bigsmp_check_apicid_used(physid_mask_t *map, u32 apicid) 22 { 23 return false; 24 } 25 26 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap) 27 { 28 /* For clustered we don't have a good way to do this yet - hack */ 29 physids_promote(0xFFL, retmap); 30 } 31 32 static u32 bigsmp_phys_pkg_id(u32 cpuid_apic, int index_msb) 33 { 34 return cpuid_apic >> index_msb; 35 } 36 37 static void bigsmp_send_IPI_allbutself(int vector) 38 { 39 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 40 } 41 42 static void bigsmp_send_IPI_all(int vector) 43 { 44 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 45 } 46 47 static int dmi_bigsmp; /* can be set by dmi scanners */ 48 49 static int hp_ht_bigsmp(const struct dmi_system_id *d) 50 { 51 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 52 dmi_bigsmp = 1; 53 54 return 0; 55 } 56 57 58 static const struct dmi_system_id bigsmp_dmi_table[] = { 59 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 60 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 61 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 62 } 63 }, 64 65 { hp_ht_bigsmp, "HP ProLiant DL740", 66 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 67 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 68 } 69 }, 70 { } /* NULL entry stops DMI scanning */ 71 }; 72 73 static int probe_bigsmp(void) 74 { 75 return dmi_check_system(bigsmp_dmi_table); 76 } 77 78 static struct apic apic_bigsmp __ro_after_init = { 79 80 .name = "bigsmp", 81 .probe = probe_bigsmp, 82 83 .dest_mode_logical = false, 84 85 .disable_esr = 1, 86 87 .check_apicid_used = bigsmp_check_apicid_used, 88 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, 89 .cpu_present_to_apicid = default_cpu_present_to_apicid, 90 .phys_pkg_id = bigsmp_phys_pkg_id, 91 92 .max_apic_id = 0xFE, 93 .get_apic_id = bigsmp_get_apic_id, 94 .set_apic_id = NULL, 95 96 .calc_dest_apicid = apic_default_calc_apicid, 97 98 .send_IPI = default_send_IPI_single_phys, 99 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 100 .send_IPI_mask_allbutself = NULL, 101 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 102 .send_IPI_all = bigsmp_send_IPI_all, 103 .send_IPI_self = default_send_IPI_self, 104 105 .read = native_apic_mem_read, 106 .write = native_apic_mem_write, 107 .eoi = native_apic_mem_eoi, 108 .icr_read = native_apic_icr_read, 109 .icr_write = native_apic_icr_write, 110 .wait_icr_idle = apic_mem_wait_icr_idle, 111 .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout, 112 }; 113 114 bool __init apic_bigsmp_possible(bool cmdline_override) 115 { 116 return apic == &apic_bigsmp || !cmdline_override; 117 } 118 119 void __init apic_bigsmp_force(void) 120 { 121 if (apic != &apic_bigsmp) 122 apic_install_driver(&apic_bigsmp); 123 } 124 125 apic_driver(apic_bigsmp); 126