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 unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid) 30 { 31 return 0; 32 } 33 34 static unsigned long bigsmp_check_apicid_present(int bit) 35 { 36 return 1; 37 } 38 39 static int bigsmp_early_logical_apicid(int cpu) 40 { 41 /* on bigsmp, logical apicid is the same as physical */ 42 return early_per_cpu(x86_cpu_to_apicid, cpu); 43 } 44 45 static inline unsigned long calculate_ldr(int cpu) 46 { 47 unsigned long val, id; 48 49 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 50 id = per_cpu(x86_bios_cpu_apicid, cpu); 51 val |= SET_APIC_LOGICAL_ID(id); 52 53 return val; 54 } 55 56 /* 57 * Set up the logical destination ID. 58 * 59 * Intel recommends to set DFR, LDR and TPR before enabling 60 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel 61 * document number 292116). So here it goes... 62 */ 63 static void bigsmp_init_apic_ldr(void) 64 { 65 unsigned long val; 66 int cpu = smp_processor_id(); 67 68 apic_write(APIC_DFR, APIC_DFR_FLAT); 69 val = calculate_ldr(cpu); 70 apic_write(APIC_LDR, val); 71 } 72 73 static void bigsmp_setup_apic_routing(void) 74 { 75 printk(KERN_INFO 76 "Enabling APIC mode: Physflat. Using %d I/O APICs\n", 77 nr_ioapics); 78 } 79 80 static int bigsmp_cpu_present_to_apicid(int mps_cpu) 81 { 82 if (mps_cpu < nr_cpu_ids) 83 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu); 84 85 return BAD_APICID; 86 } 87 88 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap) 89 { 90 /* For clustered we don't have a good way to do this yet - hack */ 91 physids_promote(0xFFL, retmap); 92 } 93 94 static int bigsmp_check_phys_apicid_present(int phys_apicid) 95 { 96 return 1; 97 } 98 99 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb) 100 { 101 return cpuid_apic >> index_msb; 102 } 103 104 static inline void bigsmp_send_IPI_mask(const struct cpumask *mask, int vector) 105 { 106 default_send_IPI_mask_sequence_phys(mask, vector); 107 } 108 109 static void bigsmp_send_IPI_allbutself(int vector) 110 { 111 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 112 } 113 114 static void bigsmp_send_IPI_all(int vector) 115 { 116 bigsmp_send_IPI_mask(cpu_online_mask, vector); 117 } 118 119 static int dmi_bigsmp; /* can be set by dmi scanners */ 120 121 static int hp_ht_bigsmp(const struct dmi_system_id *d) 122 { 123 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 124 dmi_bigsmp = 1; 125 126 return 0; 127 } 128 129 130 static const struct dmi_system_id bigsmp_dmi_table[] = { 131 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 132 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 133 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 134 } 135 }, 136 137 { hp_ht_bigsmp, "HP ProLiant DL740", 138 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 139 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 140 } 141 }, 142 { } /* NULL entry stops DMI scanning */ 143 }; 144 145 static int probe_bigsmp(void) 146 { 147 if (def_to_bigsmp) 148 dmi_bigsmp = 1; 149 else 150 dmi_check_system(bigsmp_dmi_table); 151 152 return dmi_bigsmp; 153 } 154 155 static struct apic apic_bigsmp = { 156 157 .name = "bigsmp", 158 .probe = probe_bigsmp, 159 .acpi_madt_oem_check = NULL, 160 .apic_id_valid = default_apic_id_valid, 161 .apic_id_registered = bigsmp_apic_id_registered, 162 163 .irq_delivery_mode = dest_Fixed, 164 /* phys delivery to target CPU: */ 165 .irq_dest_mode = 0, 166 167 .target_cpus = default_target_cpus, 168 .disable_esr = 1, 169 .dest_logical = 0, 170 .check_apicid_used = bigsmp_check_apicid_used, 171 .check_apicid_present = bigsmp_check_apicid_present, 172 173 .vector_allocation_domain = default_vector_allocation_domain, 174 .init_apic_ldr = bigsmp_init_apic_ldr, 175 176 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, 177 .setup_apic_routing = bigsmp_setup_apic_routing, 178 .multi_timer_check = NULL, 179 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid, 180 .apicid_to_cpu_present = physid_set_mask_of_physid, 181 .setup_portio_remap = NULL, 182 .check_phys_apicid_present = bigsmp_check_phys_apicid_present, 183 .enable_apic_mode = NULL, 184 .phys_pkg_id = bigsmp_phys_pkg_id, 185 .mps_oem_check = NULL, 186 187 .get_apic_id = bigsmp_get_apic_id, 188 .set_apic_id = NULL, 189 .apic_id_mask = 0xFF << 24, 190 191 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 192 193 .send_IPI_mask = bigsmp_send_IPI_mask, 194 .send_IPI_mask_allbutself = NULL, 195 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 196 .send_IPI_all = bigsmp_send_IPI_all, 197 .send_IPI_self = default_send_IPI_self, 198 199 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 200 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 201 202 .wait_for_init_deassert = true, 203 .smp_callin_clear_local_apic = NULL, 204 .inquire_remote_apic = default_inquire_remote_apic, 205 206 .read = native_apic_mem_read, 207 .write = native_apic_mem_write, 208 .eoi_write = native_apic_mem_write, 209 .icr_read = native_apic_icr_read, 210 .icr_write = native_apic_icr_write, 211 .wait_icr_idle = native_apic_wait_icr_idle, 212 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 213 214 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid, 215 }; 216 217 void __init generic_bigsmp_probe(void) 218 { 219 unsigned int cpu; 220 221 if (!probe_bigsmp()) 222 return; 223 224 apic = &apic_bigsmp; 225 226 for_each_possible_cpu(cpu) { 227 if (early_per_cpu(x86_cpu_to_logical_apicid, 228 cpu) == BAD_APICID) 229 continue; 230 early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 231 bigsmp_early_logical_apicid(cpu); 232 } 233 234 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name); 235 } 236 237 apic_driver(apic_bigsmp); 238