1 /* 2 * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs. 3 * 4 * Drives the local APIC in "clustered mode". 5 */ 6 #include <linux/threads.h> 7 #include <linux/cpumask.h> 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 #include <linux/dmi.h> 11 #include <linux/smp.h> 12 13 #include <asm/apicdef.h> 14 #include <asm/fixmap.h> 15 #include <asm/mpspec.h> 16 #include <asm/apic.h> 17 #include <asm/ipi.h> 18 19 static unsigned bigsmp_get_apic_id(unsigned long x) 20 { 21 return (x >> 24) & 0xFF; 22 } 23 24 static int bigsmp_apic_id_registered(void) 25 { 26 return 1; 27 } 28 29 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid) 30 { 31 return false; 32 } 33 34 static int bigsmp_early_logical_apicid(int cpu) 35 { 36 /* on bigsmp, logical apicid is the same as physical */ 37 return early_per_cpu(x86_cpu_to_apicid, cpu); 38 } 39 40 static inline unsigned long calculate_ldr(int cpu) 41 { 42 unsigned long val, id; 43 44 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 45 id = per_cpu(x86_bios_cpu_apicid, cpu); 46 val |= SET_APIC_LOGICAL_ID(id); 47 48 return val; 49 } 50 51 /* 52 * Set up the logical destination ID. 53 * 54 * Intel recommends to set DFR, LDR and TPR before enabling 55 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel 56 * document number 292116). So here it goes... 57 */ 58 static void bigsmp_init_apic_ldr(void) 59 { 60 unsigned long val; 61 int cpu = smp_processor_id(); 62 63 apic_write(APIC_DFR, APIC_DFR_FLAT); 64 val = calculate_ldr(cpu); 65 apic_write(APIC_LDR, val); 66 } 67 68 static void bigsmp_setup_apic_routing(void) 69 { 70 printk(KERN_INFO 71 "Enabling APIC mode: Physflat. Using %d I/O APICs\n", 72 nr_ioapics); 73 } 74 75 static int bigsmp_cpu_present_to_apicid(int mps_cpu) 76 { 77 if (mps_cpu < nr_cpu_ids) 78 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu); 79 80 return BAD_APICID; 81 } 82 83 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap) 84 { 85 /* For clustered we don't have a good way to do this yet - hack */ 86 physids_promote(0xFFL, retmap); 87 } 88 89 static int bigsmp_check_phys_apicid_present(int phys_apicid) 90 { 91 return 1; 92 } 93 94 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb) 95 { 96 return cpuid_apic >> index_msb; 97 } 98 99 static void bigsmp_send_IPI_allbutself(int vector) 100 { 101 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 102 } 103 104 static void bigsmp_send_IPI_all(int vector) 105 { 106 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 107 } 108 109 static int dmi_bigsmp; /* can be set by dmi scanners */ 110 111 static int hp_ht_bigsmp(const struct dmi_system_id *d) 112 { 113 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 114 dmi_bigsmp = 1; 115 116 return 0; 117 } 118 119 120 static const struct dmi_system_id bigsmp_dmi_table[] = { 121 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 122 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 123 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 124 } 125 }, 126 127 { hp_ht_bigsmp, "HP ProLiant DL740", 128 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 129 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 130 } 131 }, 132 { } /* NULL entry stops DMI scanning */ 133 }; 134 135 static int probe_bigsmp(void) 136 { 137 if (def_to_bigsmp) 138 dmi_bigsmp = 1; 139 else 140 dmi_check_system(bigsmp_dmi_table); 141 142 return dmi_bigsmp; 143 } 144 145 static struct apic apic_bigsmp __ro_after_init = { 146 147 .name = "bigsmp", 148 .probe = probe_bigsmp, 149 .acpi_madt_oem_check = NULL, 150 .apic_id_valid = default_apic_id_valid, 151 .apic_id_registered = bigsmp_apic_id_registered, 152 153 .irq_delivery_mode = dest_Fixed, 154 /* phys delivery to target CPU: */ 155 .irq_dest_mode = 0, 156 157 .target_cpus = default_target_cpus, 158 .disable_esr = 1, 159 .dest_logical = 0, 160 .check_apicid_used = bigsmp_check_apicid_used, 161 162 .vector_allocation_domain = default_vector_allocation_domain, 163 .init_apic_ldr = bigsmp_init_apic_ldr, 164 165 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, 166 .setup_apic_routing = bigsmp_setup_apic_routing, 167 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid, 168 .apicid_to_cpu_present = physid_set_mask_of_physid, 169 .check_phys_apicid_present = bigsmp_check_phys_apicid_present, 170 .phys_pkg_id = bigsmp_phys_pkg_id, 171 172 .get_apic_id = bigsmp_get_apic_id, 173 .set_apic_id = NULL, 174 175 .cpu_mask_to_apicid = default_cpu_mask_to_apicid, 176 177 .send_IPI = default_send_IPI_single_phys, 178 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 179 .send_IPI_mask_allbutself = NULL, 180 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 181 .send_IPI_all = bigsmp_send_IPI_all, 182 .send_IPI_self = default_send_IPI_self, 183 184 .inquire_remote_apic = default_inquire_remote_apic, 185 186 .read = native_apic_mem_read, 187 .write = native_apic_mem_write, 188 .eoi_write = native_apic_mem_write, 189 .icr_read = native_apic_icr_read, 190 .icr_write = native_apic_icr_write, 191 .wait_icr_idle = native_apic_wait_icr_idle, 192 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 193 194 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid, 195 }; 196 197 void __init generic_bigsmp_probe(void) 198 { 199 unsigned int cpu; 200 201 if (!probe_bigsmp()) 202 return; 203 204 apic = &apic_bigsmp; 205 206 for_each_possible_cpu(cpu) { 207 if (early_per_cpu(x86_cpu_to_logical_apicid, 208 cpu) == BAD_APICID) 209 continue; 210 early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 211 bigsmp_early_logical_apicid(cpu); 212 } 213 214 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name); 215 } 216 217 apic_driver(apic_bigsmp); 218