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 const struct cpumask *bigsmp_target_cpus(void) 30 { 31 #ifdef CONFIG_SMP 32 return cpu_online_mask; 33 #else 34 return cpumask_of(0); 35 #endif 36 } 37 38 static unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid) 39 { 40 return 0; 41 } 42 43 static unsigned long bigsmp_check_apicid_present(int bit) 44 { 45 return 1; 46 } 47 48 static int bigsmp_early_logical_apicid(int cpu) 49 { 50 /* on bigsmp, logical apicid is the same as physical */ 51 return early_per_cpu(x86_cpu_to_apicid, cpu); 52 } 53 54 static inline unsigned long calculate_ldr(int cpu) 55 { 56 unsigned long val, id; 57 58 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 59 id = per_cpu(x86_bios_cpu_apicid, cpu); 60 val |= SET_APIC_LOGICAL_ID(id); 61 62 return val; 63 } 64 65 /* 66 * Set up the logical destination ID. 67 * 68 * Intel recommends to set DFR, LDR and TPR before enabling 69 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel 70 * document number 292116). So here it goes... 71 */ 72 static void bigsmp_init_apic_ldr(void) 73 { 74 unsigned long val; 75 int cpu = smp_processor_id(); 76 77 apic_write(APIC_DFR, APIC_DFR_FLAT); 78 val = calculate_ldr(cpu); 79 apic_write(APIC_LDR, val); 80 } 81 82 static void bigsmp_setup_apic_routing(void) 83 { 84 printk(KERN_INFO 85 "Enabling APIC mode: Physflat. Using %d I/O APICs\n", 86 nr_ioapics); 87 } 88 89 static int bigsmp_cpu_present_to_apicid(int mps_cpu) 90 { 91 if (mps_cpu < nr_cpu_ids) 92 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu); 93 94 return BAD_APICID; 95 } 96 97 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap) 98 { 99 /* For clustered we don't have a good way to do this yet - hack */ 100 physids_promote(0xFFL, retmap); 101 } 102 103 static int bigsmp_check_phys_apicid_present(int phys_apicid) 104 { 105 return 1; 106 } 107 108 /* As we are using single CPU as destination, pick only one CPU here */ 109 static unsigned int bigsmp_cpu_mask_to_apicid(const struct cpumask *cpumask) 110 { 111 int cpu = cpumask_first(cpumask); 112 113 if (cpu < nr_cpu_ids) 114 return cpu_physical_id(cpu); 115 return BAD_APICID; 116 } 117 118 static unsigned int bigsmp_cpu_mask_to_apicid_and(const struct cpumask *cpumask, 119 const struct cpumask *andmask) 120 { 121 int cpu; 122 123 /* 124 * We're using fixed IRQ delivery, can only return one phys APIC ID. 125 * May as well be the first. 126 */ 127 for_each_cpu_and(cpu, cpumask, andmask) { 128 if (cpumask_test_cpu(cpu, cpu_online_mask)) 129 return cpu_physical_id(cpu); 130 } 131 return BAD_APICID; 132 } 133 134 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb) 135 { 136 return cpuid_apic >> index_msb; 137 } 138 139 static inline void bigsmp_send_IPI_mask(const struct cpumask *mask, int vector) 140 { 141 default_send_IPI_mask_sequence_phys(mask, vector); 142 } 143 144 static void bigsmp_send_IPI_allbutself(int vector) 145 { 146 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 147 } 148 149 static void bigsmp_send_IPI_all(int vector) 150 { 151 bigsmp_send_IPI_mask(cpu_online_mask, vector); 152 } 153 154 static int dmi_bigsmp; /* can be set by dmi scanners */ 155 156 static int hp_ht_bigsmp(const struct dmi_system_id *d) 157 { 158 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 159 dmi_bigsmp = 1; 160 161 return 0; 162 } 163 164 165 static const struct dmi_system_id bigsmp_dmi_table[] = { 166 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 167 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 168 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 169 } 170 }, 171 172 { hp_ht_bigsmp, "HP ProLiant DL740", 173 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 174 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 175 } 176 }, 177 { } /* NULL entry stops DMI scanning */ 178 }; 179 180 static void bigsmp_vector_allocation_domain(int cpu, struct cpumask *retmask) 181 { 182 cpumask_clear(retmask); 183 cpumask_set_cpu(cpu, retmask); 184 } 185 186 static int probe_bigsmp(void) 187 { 188 if (def_to_bigsmp) 189 dmi_bigsmp = 1; 190 else 191 dmi_check_system(bigsmp_dmi_table); 192 193 return dmi_bigsmp; 194 } 195 196 struct apic apic_bigsmp = { 197 198 .name = "bigsmp", 199 .probe = probe_bigsmp, 200 .acpi_madt_oem_check = NULL, 201 .apic_id_registered = bigsmp_apic_id_registered, 202 203 .irq_delivery_mode = dest_Fixed, 204 /* phys delivery to target CPU: */ 205 .irq_dest_mode = 0, 206 207 .target_cpus = bigsmp_target_cpus, 208 .disable_esr = 1, 209 .dest_logical = 0, 210 .check_apicid_used = bigsmp_check_apicid_used, 211 .check_apicid_present = bigsmp_check_apicid_present, 212 213 .vector_allocation_domain = bigsmp_vector_allocation_domain, 214 .init_apic_ldr = bigsmp_init_apic_ldr, 215 216 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, 217 .setup_apic_routing = bigsmp_setup_apic_routing, 218 .multi_timer_check = NULL, 219 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid, 220 .apicid_to_cpu_present = physid_set_mask_of_physid, 221 .setup_portio_remap = NULL, 222 .check_phys_apicid_present = bigsmp_check_phys_apicid_present, 223 .enable_apic_mode = NULL, 224 .phys_pkg_id = bigsmp_phys_pkg_id, 225 .mps_oem_check = NULL, 226 227 .get_apic_id = bigsmp_get_apic_id, 228 .set_apic_id = NULL, 229 .apic_id_mask = 0xFF << 24, 230 231 .cpu_mask_to_apicid = bigsmp_cpu_mask_to_apicid, 232 .cpu_mask_to_apicid_and = bigsmp_cpu_mask_to_apicid_and, 233 234 .send_IPI_mask = bigsmp_send_IPI_mask, 235 .send_IPI_mask_allbutself = NULL, 236 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 237 .send_IPI_all = bigsmp_send_IPI_all, 238 .send_IPI_self = default_send_IPI_self, 239 240 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW, 241 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH, 242 243 .wait_for_init_deassert = default_wait_for_init_deassert, 244 245 .smp_callin_clear_local_apic = NULL, 246 .inquire_remote_apic = default_inquire_remote_apic, 247 248 .read = native_apic_mem_read, 249 .write = native_apic_mem_write, 250 .icr_read = native_apic_icr_read, 251 .icr_write = native_apic_icr_write, 252 .wait_icr_idle = native_apic_wait_icr_idle, 253 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 254 255 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid, 256 .x86_32_numa_cpu_node = default_x86_32_numa_cpu_node, 257 }; 258