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 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 inline void bigsmp_send_IPI_mask(const struct cpumask *mask, int vector) 100 { 101 default_send_IPI_mask_sequence_phys(mask, vector); 102 } 103 104 static void bigsmp_send_IPI_allbutself(int vector) 105 { 106 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 107 } 108 109 static void bigsmp_send_IPI_all(int vector) 110 { 111 bigsmp_send_IPI_mask(cpu_online_mask, vector); 112 } 113 114 static int dmi_bigsmp; /* can be set by dmi scanners */ 115 116 static int hp_ht_bigsmp(const struct dmi_system_id *d) 117 { 118 printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); 119 dmi_bigsmp = 1; 120 121 return 0; 122 } 123 124 125 static const struct dmi_system_id bigsmp_dmi_table[] = { 126 { hp_ht_bigsmp, "HP ProLiant DL760 G2", 127 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 128 DMI_MATCH(DMI_BIOS_VERSION, "P44-"), 129 } 130 }, 131 132 { hp_ht_bigsmp, "HP ProLiant DL740", 133 { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), 134 DMI_MATCH(DMI_BIOS_VERSION, "P47-"), 135 } 136 }, 137 { } /* NULL entry stops DMI scanning */ 138 }; 139 140 static int probe_bigsmp(void) 141 { 142 if (def_to_bigsmp) 143 dmi_bigsmp = 1; 144 else 145 dmi_check_system(bigsmp_dmi_table); 146 147 return dmi_bigsmp; 148 } 149 150 static struct apic apic_bigsmp = { 151 152 .name = "bigsmp", 153 .probe = probe_bigsmp, 154 .acpi_madt_oem_check = NULL, 155 .apic_id_valid = default_apic_id_valid, 156 .apic_id_registered = bigsmp_apic_id_registered, 157 158 .irq_delivery_mode = dest_Fixed, 159 /* phys delivery to target CPU: */ 160 .irq_dest_mode = 0, 161 162 .target_cpus = default_target_cpus, 163 .disable_esr = 1, 164 .dest_logical = 0, 165 .check_apicid_used = bigsmp_check_apicid_used, 166 167 .vector_allocation_domain = default_vector_allocation_domain, 168 .init_apic_ldr = bigsmp_init_apic_ldr, 169 170 .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, 171 .setup_apic_routing = bigsmp_setup_apic_routing, 172 .cpu_present_to_apicid = bigsmp_cpu_present_to_apicid, 173 .apicid_to_cpu_present = physid_set_mask_of_physid, 174 .check_phys_apicid_present = bigsmp_check_phys_apicid_present, 175 .phys_pkg_id = bigsmp_phys_pkg_id, 176 177 .get_apic_id = bigsmp_get_apic_id, 178 .set_apic_id = NULL, 179 .apic_id_mask = 0xFF << 24, 180 181 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 182 183 .send_IPI_mask = bigsmp_send_IPI_mask, 184 .send_IPI_mask_allbutself = NULL, 185 .send_IPI_allbutself = bigsmp_send_IPI_allbutself, 186 .send_IPI_all = bigsmp_send_IPI_all, 187 .send_IPI_self = default_send_IPI_self, 188 189 .inquire_remote_apic = default_inquire_remote_apic, 190 191 .read = native_apic_mem_read, 192 .write = native_apic_mem_write, 193 .eoi_write = native_apic_mem_write, 194 .icr_read = native_apic_icr_read, 195 .icr_write = native_apic_icr_write, 196 .wait_icr_idle = native_apic_wait_icr_idle, 197 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 198 199 .x86_32_early_logical_apicid = bigsmp_early_logical_apicid, 200 }; 201 202 void __init generic_bigsmp_probe(void) 203 { 204 unsigned int cpu; 205 206 if (!probe_bigsmp()) 207 return; 208 209 apic = &apic_bigsmp; 210 211 for_each_possible_cpu(cpu) { 212 if (early_per_cpu(x86_cpu_to_logical_apicid, 213 cpu) == BAD_APICID) 214 continue; 215 early_per_cpu(x86_cpu_to_logical_apicid, cpu) = 216 bigsmp_early_logical_apicid(cpu); 217 } 218 219 pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name); 220 } 221 222 apic_driver(apic_bigsmp); 223