1 /* 2 * c 2001 PPC 64 Team, IBM Corp 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 */ 9 10 #include <linux/smp.h> 11 #include <linux/export.h> 12 #include <linux/memblock.h> 13 #include <linux/sched/task.h> 14 15 #include <asm/lppaca.h> 16 #include <asm/paca.h> 17 #include <asm/sections.h> 18 #include <asm/pgtable.h> 19 #include <asm/kexec.h> 20 21 #include "setup.h" 22 23 #ifndef CONFIG_SMP 24 #define boot_cpuid 0 25 #endif 26 27 static void *__init alloc_paca_data(unsigned long size, unsigned long align, 28 unsigned long limit, int cpu) 29 { 30 unsigned long pa; 31 int nid; 32 33 /* 34 * boot_cpuid paca is allocated very early before cpu_to_node is up. 35 * Set bottom-up mode, because the boot CPU should be on node-0, 36 * which will put its paca in the right place. 37 */ 38 if (cpu == boot_cpuid) { 39 nid = -1; 40 memblock_set_bottom_up(true); 41 } else { 42 nid = early_cpu_to_node(cpu); 43 } 44 45 pa = memblock_alloc_base_nid(size, align, limit, nid, MEMBLOCK_NONE); 46 if (!pa) { 47 pa = memblock_alloc_base(size, align, limit); 48 if (!pa) 49 panic("cannot allocate paca data"); 50 } 51 52 if (cpu == boot_cpuid) 53 memblock_set_bottom_up(false); 54 55 return __va(pa); 56 } 57 58 #ifdef CONFIG_PPC_PSERIES 59 60 /* 61 * See asm/lppaca.h for more detail. 62 * 63 * lppaca structures must must be 1kB in size, L1 cache line aligned, 64 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy 65 * these requirements. 66 */ 67 static inline void init_lppaca(struct lppaca *lppaca) 68 { 69 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 70 71 *lppaca = (struct lppaca) { 72 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ 73 .size = cpu_to_be16(0x400), 74 .fpregs_in_use = 1, 75 .slb_count = cpu_to_be16(64), 76 .vmxregs_in_use = 0, 77 .page_ins = 0, }; 78 }; 79 80 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) 81 { 82 struct lppaca *lp; 83 size_t size = 0x400; 84 85 BUILD_BUG_ON(size < sizeof(struct lppaca)); 86 87 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 88 return NULL; 89 90 lp = alloc_paca_data(size, 0x400, limit, cpu); 91 init_lppaca(lp); 92 93 return lp; 94 } 95 #endif /* CONFIG_PPC_BOOK3S */ 96 97 #ifdef CONFIG_PPC_BOOK3S_64 98 99 /* 100 * 3 persistent SLBs are allocated here. The buffer will be zero 101 * initially, hence will all be invaild until we actually write them. 102 * 103 * If you make the number of persistent SLB entries dynamic, please also 104 * update PR KVM to flush and restore them accordingly. 105 */ 106 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) 107 { 108 struct slb_shadow *s; 109 110 if (cpu != boot_cpuid) { 111 /* 112 * Boot CPU comes here before early_radix_enabled 113 * is parsed (e.g., for disable_radix). So allocate 114 * always and this will be fixed up in free_unused_pacas. 115 */ 116 if (early_radix_enabled()) 117 return NULL; 118 } 119 120 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); 121 memset(s, 0, sizeof(*s)); 122 123 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 124 s->buffer_length = cpu_to_be32(sizeof(*s)); 125 126 return s; 127 } 128 129 #endif /* CONFIG_PPC_BOOK3S_64 */ 130 131 /* The Paca is an array with one entry per processor. Each contains an 132 * lppaca, which contains the information shared between the 133 * hypervisor and Linux. 134 * On systems with hardware multi-threading, there are two threads 135 * per processor. The Paca array must contain an entry for each thread. 136 * The VPD Areas will give a max logical processors = 2 * max physical 137 * processors. The processor VPD array needs one entry per physical 138 * processor (not thread). 139 */ 140 struct paca_struct **paca_ptrs __read_mostly; 141 EXPORT_SYMBOL(paca_ptrs); 142 143 void __init initialise_paca(struct paca_struct *new_paca, int cpu) 144 { 145 #ifdef CONFIG_PPC_PSERIES 146 new_paca->lppaca_ptr = NULL; 147 #endif 148 #ifdef CONFIG_PPC_BOOK3E 149 new_paca->kernel_pgd = swapper_pg_dir; 150 #endif 151 new_paca->lock_token = 0x8000; 152 new_paca->paca_index = cpu; 153 new_paca->kernel_toc = kernel_toc_addr(); 154 new_paca->kernelbase = (unsigned long) _stext; 155 /* Only set MSR:IR/DR when MMU is initialized */ 156 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 157 new_paca->hw_cpu_id = 0xffff; 158 new_paca->kexec_state = KEXEC_STATE_NONE; 159 new_paca->__current = &init_task; 160 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 161 #ifdef CONFIG_PPC_BOOK3S_64 162 new_paca->slb_shadow_ptr = NULL; 163 #endif 164 165 #ifdef CONFIG_PPC_BOOK3E 166 /* For now -- if we have threads this will be adjusted later */ 167 new_paca->tcd_ptr = &new_paca->tcd; 168 #endif 169 } 170 171 /* Put the paca pointer into r13 and SPRG_PACA */ 172 void setup_paca(struct paca_struct *new_paca) 173 { 174 /* Setup r13 */ 175 local_paca = new_paca; 176 177 #ifdef CONFIG_PPC_BOOK3E 178 /* On Book3E, initialize the TLB miss exception frames */ 179 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 180 #else 181 /* In HV mode, we setup both HPACA and PACA to avoid problems 182 * if we do a GET_PACA() before the feature fixups have been 183 * applied 184 */ 185 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 186 mtspr(SPRN_SPRG_HPACA, local_paca); 187 #endif 188 mtspr(SPRN_SPRG_PACA, local_paca); 189 190 } 191 192 static int __initdata paca_nr_cpu_ids; 193 static int __initdata paca_ptrs_size; 194 static int __initdata paca_struct_size; 195 196 void __init allocate_paca_ptrs(void) 197 { 198 paca_nr_cpu_ids = nr_cpu_ids; 199 200 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 201 paca_ptrs = __va(memblock_alloc(paca_ptrs_size, 0)); 202 memset(paca_ptrs, 0x88, paca_ptrs_size); 203 } 204 205 void __init allocate_paca(int cpu) 206 { 207 u64 limit; 208 struct paca_struct *paca; 209 210 BUG_ON(cpu >= paca_nr_cpu_ids); 211 212 #ifdef CONFIG_PPC_BOOK3S_64 213 /* 214 * We access pacas in real mode, and cannot take SLB faults 215 * on them when in virtual mode, so allocate them accordingly. 216 */ 217 limit = min(ppc64_bolted_size(), ppc64_rma_size); 218 #else 219 limit = ppc64_rma_size; 220 #endif 221 222 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, 223 limit, cpu); 224 paca_ptrs[cpu] = paca; 225 memset(paca, 0, sizeof(struct paca_struct)); 226 227 initialise_paca(paca, cpu); 228 #ifdef CONFIG_PPC_PSERIES 229 paca->lppaca_ptr = new_lppaca(cpu, limit); 230 #endif 231 #ifdef CONFIG_PPC_BOOK3S_64 232 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); 233 #endif 234 paca_struct_size += sizeof(struct paca_struct); 235 } 236 237 void __init free_unused_pacas(void) 238 { 239 int new_ptrs_size; 240 241 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 242 if (new_ptrs_size < paca_ptrs_size) 243 memblock_free(__pa(paca_ptrs) + new_ptrs_size, 244 paca_ptrs_size - new_ptrs_size); 245 246 paca_nr_cpu_ids = nr_cpu_ids; 247 paca_ptrs_size = new_ptrs_size; 248 249 #ifdef CONFIG_PPC_BOOK3S_64 250 if (early_radix_enabled()) { 251 /* Ugly fixup, see new_slb_shadow() */ 252 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), 253 sizeof(struct slb_shadow)); 254 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; 255 } 256 #endif 257 258 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", 259 paca_ptrs_size + paca_struct_size, nr_cpu_ids); 260 } 261 262 void copy_mm_to_paca(struct mm_struct *mm) 263 { 264 #ifdef CONFIG_PPC_BOOK3S 265 mm_context_t *context = &mm->context; 266 267 get_paca()->mm_ctx_id = context->id; 268 #ifdef CONFIG_PPC_MM_SLICES 269 VM_BUG_ON(!mm->context.slb_addr_limit); 270 get_paca()->mm_ctx_slb_addr_limit = mm->context.slb_addr_limit; 271 memcpy(&get_paca()->mm_ctx_low_slices_psize, 272 &context->low_slices_psize, sizeof(context->low_slices_psize)); 273 memcpy(&get_paca()->mm_ctx_high_slices_psize, 274 &context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm)); 275 #else /* CONFIG_PPC_MM_SLICES */ 276 get_paca()->mm_ctx_user_psize = context->user_psize; 277 get_paca()->mm_ctx_sllp = context->sllp; 278 #endif 279 #else /* !CONFIG_PPC_BOOK3S */ 280 return; 281 #endif 282 } 283