1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * c 2001 PPC 64 Team, IBM Corp 4 */ 5 6 #include <linux/smp.h> 7 #include <linux/export.h> 8 #include <linux/memblock.h> 9 #include <linux/sched/task.h> 10 #include <linux/numa.h> 11 #include <linux/pgtable.h> 12 13 #include <asm/lppaca.h> 14 #include <asm/paca.h> 15 #include <asm/sections.h> 16 #include <asm/kexec.h> 17 #include <asm/svm.h> 18 #include <asm/ultravisor.h> 19 #include <asm/rtas.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 void *ptr; 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 = NUMA_NO_NODE; 40 memblock_set_bottom_up(true); 41 } else { 42 nid = early_cpu_to_node(cpu); 43 } 44 45 ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 46 limit, nid); 47 if (!ptr) 48 panic("cannot allocate paca data"); 49 50 if (cpu == boot_cpuid) 51 memblock_set_bottom_up(false); 52 53 return ptr; 54 } 55 56 #ifdef CONFIG_PPC_PSERIES 57 58 #define LPPACA_SIZE 0x400 59 60 static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align, 61 unsigned long limit, int cpu) 62 { 63 size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE); 64 static unsigned long shared_lppaca_size; 65 static void *shared_lppaca; 66 void *ptr; 67 68 if (!shared_lppaca) { 69 memblock_set_bottom_up(true); 70 71 shared_lppaca = 72 memblock_alloc_try_nid(shared_lppaca_total_size, 73 PAGE_SIZE, MEMBLOCK_LOW_LIMIT, 74 limit, NUMA_NO_NODE); 75 if (!shared_lppaca) 76 panic("cannot allocate shared data"); 77 78 memblock_set_bottom_up(false); 79 uv_share_page(PHYS_PFN(__pa(shared_lppaca)), 80 shared_lppaca_total_size >> PAGE_SHIFT); 81 } 82 83 ptr = shared_lppaca + shared_lppaca_size; 84 shared_lppaca_size += size; 85 86 /* 87 * This is very early in boot, so no harm done if the kernel crashes at 88 * this point. 89 */ 90 BUG_ON(shared_lppaca_size > shared_lppaca_total_size); 91 92 return ptr; 93 } 94 95 /* 96 * See asm/lppaca.h for more detail. 97 * 98 * lppaca structures must must be 1kB in size, L1 cache line aligned, 99 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy 100 * these requirements. 101 */ 102 static inline void init_lppaca(struct lppaca *lppaca) 103 { 104 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 105 106 *lppaca = (struct lppaca) { 107 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ 108 .size = cpu_to_be16(LPPACA_SIZE), 109 .fpregs_in_use = 1, 110 .slb_count = cpu_to_be16(64), 111 .vmxregs_in_use = 0, 112 .page_ins = 0, }; 113 }; 114 115 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) 116 { 117 struct lppaca *lp; 118 119 BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE); 120 121 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 122 return NULL; 123 124 if (is_secure_guest()) 125 lp = alloc_shared_lppaca(LPPACA_SIZE, 0x400, limit, cpu); 126 else 127 lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu); 128 129 init_lppaca(lp); 130 131 return lp; 132 } 133 #endif /* CONFIG_PPC_PSERIES */ 134 135 #ifdef CONFIG_PPC_BOOK3S_64 136 137 /* 138 * 3 persistent SLBs are allocated here. The buffer will be zero 139 * initially, hence will all be invaild until we actually write them. 140 * 141 * If you make the number of persistent SLB entries dynamic, please also 142 * update PR KVM to flush and restore them accordingly. 143 */ 144 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) 145 { 146 struct slb_shadow *s; 147 148 if (cpu != boot_cpuid) { 149 /* 150 * Boot CPU comes here before early_radix_enabled 151 * is parsed (e.g., for disable_radix). So allocate 152 * always and this will be fixed up in free_unused_pacas. 153 */ 154 if (early_radix_enabled()) 155 return NULL; 156 } 157 158 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); 159 160 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 161 s->buffer_length = cpu_to_be32(sizeof(*s)); 162 163 return s; 164 } 165 166 #endif /* CONFIG_PPC_BOOK3S_64 */ 167 168 #ifdef CONFIG_PPC_PSERIES 169 /** 170 * new_rtas_args() - Allocates rtas args 171 * @cpu: CPU number 172 * @limit: Memory limit for this allocation 173 * 174 * Allocates a struct rtas_args and return it's pointer, 175 * if not in Hypervisor mode 176 * 177 * Return: Pointer to allocated rtas_args 178 * NULL if CPU in Hypervisor Mode 179 */ 180 static struct rtas_args * __init new_rtas_args(int cpu, unsigned long limit) 181 { 182 limit = min_t(unsigned long, limit, RTAS_INSTANTIATE_MAX); 183 184 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 185 return NULL; 186 187 return alloc_paca_data(sizeof(struct rtas_args), L1_CACHE_BYTES, 188 limit, cpu); 189 } 190 #endif /* CONFIG_PPC_PSERIES */ 191 192 /* The Paca is an array with one entry per processor. Each contains an 193 * lppaca, which contains the information shared between the 194 * hypervisor and Linux. 195 * On systems with hardware multi-threading, there are two threads 196 * per processor. The Paca array must contain an entry for each thread. 197 * The VPD Areas will give a max logical processors = 2 * max physical 198 * processors. The processor VPD array needs one entry per physical 199 * processor (not thread). 200 */ 201 struct paca_struct **paca_ptrs __read_mostly; 202 EXPORT_SYMBOL(paca_ptrs); 203 204 void __init __nostackprotector initialise_paca(struct paca_struct *new_paca, int cpu) 205 { 206 #ifdef CONFIG_PPC_PSERIES 207 new_paca->lppaca_ptr = NULL; 208 #endif 209 #ifdef CONFIG_PPC_BOOK3E 210 new_paca->kernel_pgd = swapper_pg_dir; 211 #endif 212 new_paca->lock_token = 0x8000; 213 new_paca->paca_index = cpu; 214 new_paca->kernel_toc = kernel_toc_addr(); 215 new_paca->kernelbase = (unsigned long) _stext; 216 /* Only set MSR:IR/DR when MMU is initialized */ 217 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 218 new_paca->hw_cpu_id = 0xffff; 219 new_paca->kexec_state = KEXEC_STATE_NONE; 220 new_paca->__current = &init_task; 221 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 222 #ifdef CONFIG_PPC_BOOK3S_64 223 new_paca->slb_shadow_ptr = NULL; 224 #endif 225 226 #ifdef CONFIG_PPC_BOOK3E 227 /* For now -- if we have threads this will be adjusted later */ 228 new_paca->tcd_ptr = &new_paca->tcd; 229 #endif 230 231 #ifdef CONFIG_PPC_PSERIES 232 new_paca->rtas_args_reentrant = NULL; 233 #endif 234 } 235 236 /* Put the paca pointer into r13 and SPRG_PACA */ 237 void __nostackprotector setup_paca(struct paca_struct *new_paca) 238 { 239 /* Setup r13 */ 240 local_paca = new_paca; 241 242 #ifdef CONFIG_PPC_BOOK3E 243 /* On Book3E, initialize the TLB miss exception frames */ 244 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 245 #else 246 /* 247 * In HV mode, we setup both HPACA and PACA to avoid problems 248 * if we do a GET_PACA() before the feature fixups have been 249 * applied. 250 * 251 * Normally you should test against CPU_FTR_HVMODE, but CPU features 252 * are not yet set up when we first reach here. 253 */ 254 if (mfmsr() & MSR_HV) 255 mtspr(SPRN_SPRG_HPACA, local_paca); 256 #endif 257 mtspr(SPRN_SPRG_PACA, local_paca); 258 259 } 260 261 static int __initdata paca_nr_cpu_ids; 262 static int __initdata paca_ptrs_size; 263 static int __initdata paca_struct_size; 264 265 void __init allocate_paca_ptrs(void) 266 { 267 paca_nr_cpu_ids = nr_cpu_ids; 268 269 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 270 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES); 271 if (!paca_ptrs) 272 panic("Failed to allocate %d bytes for paca pointers\n", 273 paca_ptrs_size); 274 275 memset(paca_ptrs, 0x88, paca_ptrs_size); 276 } 277 278 void __init allocate_paca(int cpu) 279 { 280 u64 limit; 281 struct paca_struct *paca; 282 283 BUG_ON(cpu >= paca_nr_cpu_ids); 284 285 #ifdef CONFIG_PPC_BOOK3S_64 286 /* 287 * We access pacas in real mode, and cannot take SLB faults 288 * on them when in virtual mode, so allocate them accordingly. 289 */ 290 limit = min(ppc64_bolted_size(), ppc64_rma_size); 291 #else 292 limit = ppc64_rma_size; 293 #endif 294 295 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, 296 limit, cpu); 297 paca_ptrs[cpu] = paca; 298 299 initialise_paca(paca, cpu); 300 #ifdef CONFIG_PPC_PSERIES 301 paca->lppaca_ptr = new_lppaca(cpu, limit); 302 #endif 303 #ifdef CONFIG_PPC_BOOK3S_64 304 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); 305 #endif 306 #ifdef CONFIG_PPC_PSERIES 307 paca->rtas_args_reentrant = new_rtas_args(cpu, limit); 308 #endif 309 paca_struct_size += sizeof(struct paca_struct); 310 } 311 312 void __init free_unused_pacas(void) 313 { 314 int new_ptrs_size; 315 316 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 317 if (new_ptrs_size < paca_ptrs_size) 318 memblock_free(__pa(paca_ptrs) + new_ptrs_size, 319 paca_ptrs_size - new_ptrs_size); 320 321 paca_nr_cpu_ids = nr_cpu_ids; 322 paca_ptrs_size = new_ptrs_size; 323 324 #ifdef CONFIG_PPC_BOOK3S_64 325 if (early_radix_enabled()) { 326 /* Ugly fixup, see new_slb_shadow() */ 327 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), 328 sizeof(struct slb_shadow)); 329 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; 330 } 331 #endif 332 333 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", 334 paca_ptrs_size + paca_struct_size, nr_cpu_ids); 335 } 336 337 void copy_mm_to_paca(struct mm_struct *mm) 338 { 339 #ifdef CONFIG_PPC_BOOK3S 340 mm_context_t *context = &mm->context; 341 342 get_paca()->mm_ctx_id = context->id; 343 #ifdef CONFIG_PPC_MM_SLICES 344 VM_BUG_ON(!mm_ctx_slb_addr_limit(context)); 345 get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context); 346 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context), 347 LOW_SLICE_ARRAY_SZ); 348 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context), 349 TASK_SLICE_ARRAY_SZ(context)); 350 #else /* CONFIG_PPC_MM_SLICES */ 351 get_paca()->mm_ctx_user_psize = context->user_psize; 352 get_paca()->mm_ctx_sllp = context->sllp; 353 #endif 354 #else /* !CONFIG_PPC_BOOK3S */ 355 return; 356 #endif 357 } 358