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 limit, 61 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 /* 72 * See Documentation/powerpc/ultravisor.rst for more details. 73 * 74 * UV/HV data sharing is in PAGE_SIZE granularity. In order to 75 * minimize the number of pages shared, align the allocation to 76 * PAGE_SIZE. 77 */ 78 shared_lppaca = 79 memblock_alloc_try_nid(shared_lppaca_total_size, 80 PAGE_SIZE, MEMBLOCK_LOW_LIMIT, 81 limit, NUMA_NO_NODE); 82 if (!shared_lppaca) 83 panic("cannot allocate shared data"); 84 85 memblock_set_bottom_up(false); 86 uv_share_page(PHYS_PFN(__pa(shared_lppaca)), 87 shared_lppaca_total_size >> PAGE_SHIFT); 88 } 89 90 ptr = shared_lppaca + shared_lppaca_size; 91 shared_lppaca_size += size; 92 93 /* 94 * This is very early in boot, so no harm done if the kernel crashes at 95 * this point. 96 */ 97 BUG_ON(shared_lppaca_size > shared_lppaca_total_size); 98 99 return ptr; 100 } 101 102 /* 103 * See asm/lppaca.h for more detail. 104 * 105 * lppaca structures must must be 1kB in size, L1 cache line aligned, 106 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy 107 * these requirements. 108 */ 109 static inline void init_lppaca(struct lppaca *lppaca) 110 { 111 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 112 113 *lppaca = (struct lppaca) { 114 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ 115 .size = cpu_to_be16(LPPACA_SIZE), 116 .fpregs_in_use = 1, 117 .slb_count = cpu_to_be16(64), 118 .vmxregs_in_use = 0, 119 .page_ins = 0, }; 120 }; 121 122 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) 123 { 124 struct lppaca *lp; 125 126 BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE); 127 128 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 129 return NULL; 130 131 if (is_secure_guest()) 132 lp = alloc_shared_lppaca(LPPACA_SIZE, limit, cpu); 133 else 134 lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu); 135 136 init_lppaca(lp); 137 138 return lp; 139 } 140 #endif /* CONFIG_PPC_PSERIES */ 141 142 #ifdef CONFIG_PPC_BOOK3S_64 143 144 /* 145 * 3 persistent SLBs are allocated here. The buffer will be zero 146 * initially, hence will all be invaild until we actually write them. 147 * 148 * If you make the number of persistent SLB entries dynamic, please also 149 * update PR KVM to flush and restore them accordingly. 150 */ 151 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) 152 { 153 struct slb_shadow *s; 154 155 if (cpu != boot_cpuid) { 156 /* 157 * Boot CPU comes here before early_radix_enabled 158 * is parsed (e.g., for disable_radix). So allocate 159 * always and this will be fixed up in free_unused_pacas. 160 */ 161 if (early_radix_enabled()) 162 return NULL; 163 } 164 165 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); 166 167 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 168 s->buffer_length = cpu_to_be32(sizeof(*s)); 169 170 return s; 171 } 172 173 #endif /* CONFIG_PPC_BOOK3S_64 */ 174 175 #ifdef CONFIG_PPC_PSERIES 176 /** 177 * new_rtas_args() - Allocates rtas args 178 * @cpu: CPU number 179 * @limit: Memory limit for this allocation 180 * 181 * Allocates a struct rtas_args and return it's pointer, 182 * if not in Hypervisor mode 183 * 184 * Return: Pointer to allocated rtas_args 185 * NULL if CPU in Hypervisor Mode 186 */ 187 static struct rtas_args * __init new_rtas_args(int cpu, unsigned long limit) 188 { 189 limit = min_t(unsigned long, limit, RTAS_INSTANTIATE_MAX); 190 191 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 192 return NULL; 193 194 return alloc_paca_data(sizeof(struct rtas_args), L1_CACHE_BYTES, 195 limit, cpu); 196 } 197 #endif /* CONFIG_PPC_PSERIES */ 198 199 /* The Paca is an array with one entry per processor. Each contains an 200 * lppaca, which contains the information shared between the 201 * hypervisor and Linux. 202 * On systems with hardware multi-threading, there are two threads 203 * per processor. The Paca array must contain an entry for each thread. 204 * The VPD Areas will give a max logical processors = 2 * max physical 205 * processors. The processor VPD array needs one entry per physical 206 * processor (not thread). 207 */ 208 struct paca_struct **paca_ptrs __read_mostly; 209 EXPORT_SYMBOL(paca_ptrs); 210 211 void __init initialise_paca(struct paca_struct *new_paca, int cpu) 212 { 213 #ifdef CONFIG_PPC_PSERIES 214 new_paca->lppaca_ptr = NULL; 215 #endif 216 #ifdef CONFIG_PPC_BOOK3E 217 new_paca->kernel_pgd = swapper_pg_dir; 218 #endif 219 new_paca->lock_token = 0x8000; 220 new_paca->paca_index = cpu; 221 new_paca->kernel_toc = kernel_toc_addr(); 222 new_paca->kernelbase = (unsigned long) _stext; 223 /* Only set MSR:IR/DR when MMU is initialized */ 224 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 225 new_paca->hw_cpu_id = 0xffff; 226 new_paca->kexec_state = KEXEC_STATE_NONE; 227 new_paca->__current = &init_task; 228 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 229 #ifdef CONFIG_PPC_BOOK3S_64 230 new_paca->slb_shadow_ptr = NULL; 231 #endif 232 233 #ifdef CONFIG_PPC_BOOK3E 234 /* For now -- if we have threads this will be adjusted later */ 235 new_paca->tcd_ptr = &new_paca->tcd; 236 #endif 237 238 #ifdef CONFIG_PPC_PSERIES 239 new_paca->rtas_args_reentrant = NULL; 240 #endif 241 } 242 243 /* Put the paca pointer into r13 and SPRG_PACA */ 244 void setup_paca(struct paca_struct *new_paca) 245 { 246 /* Setup r13 */ 247 local_paca = new_paca; 248 249 #ifdef CONFIG_PPC_BOOK3E 250 /* On Book3E, initialize the TLB miss exception frames */ 251 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 252 #else 253 /* 254 * In HV mode, we setup both HPACA and PACA to avoid problems 255 * if we do a GET_PACA() before the feature fixups have been 256 * applied. 257 * 258 * Normally you should test against CPU_FTR_HVMODE, but CPU features 259 * are not yet set up when we first reach here. 260 */ 261 if (mfmsr() & MSR_HV) 262 mtspr(SPRN_SPRG_HPACA, local_paca); 263 #endif 264 mtspr(SPRN_SPRG_PACA, local_paca); 265 266 } 267 268 static int __initdata paca_nr_cpu_ids; 269 static int __initdata paca_ptrs_size; 270 static int __initdata paca_struct_size; 271 272 void __init allocate_paca_ptrs(void) 273 { 274 paca_nr_cpu_ids = nr_cpu_ids; 275 276 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 277 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES); 278 if (!paca_ptrs) 279 panic("Failed to allocate %d bytes for paca pointers\n", 280 paca_ptrs_size); 281 282 memset(paca_ptrs, 0x88, paca_ptrs_size); 283 } 284 285 void __init allocate_paca(int cpu) 286 { 287 u64 limit; 288 struct paca_struct *paca; 289 290 BUG_ON(cpu >= paca_nr_cpu_ids); 291 292 #ifdef CONFIG_PPC_BOOK3S_64 293 /* 294 * We access pacas in real mode, and cannot take SLB faults 295 * on them when in virtual mode, so allocate them accordingly. 296 */ 297 limit = min(ppc64_bolted_size(), ppc64_rma_size); 298 #else 299 limit = ppc64_rma_size; 300 #endif 301 302 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, 303 limit, cpu); 304 paca_ptrs[cpu] = paca; 305 306 initialise_paca(paca, cpu); 307 #ifdef CONFIG_PPC_PSERIES 308 paca->lppaca_ptr = new_lppaca(cpu, limit); 309 #endif 310 #ifdef CONFIG_PPC_BOOK3S_64 311 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); 312 #endif 313 #ifdef CONFIG_PPC_PSERIES 314 paca->rtas_args_reentrant = new_rtas_args(cpu, limit); 315 #endif 316 paca_struct_size += sizeof(struct paca_struct); 317 } 318 319 void __init free_unused_pacas(void) 320 { 321 int new_ptrs_size; 322 323 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 324 if (new_ptrs_size < paca_ptrs_size) 325 memblock_free(__pa(paca_ptrs) + new_ptrs_size, 326 paca_ptrs_size - new_ptrs_size); 327 328 paca_nr_cpu_ids = nr_cpu_ids; 329 paca_ptrs_size = new_ptrs_size; 330 331 #ifdef CONFIG_PPC_BOOK3S_64 332 if (early_radix_enabled()) { 333 /* Ugly fixup, see new_slb_shadow() */ 334 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), 335 sizeof(struct slb_shadow)); 336 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; 337 } 338 #endif 339 340 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", 341 paca_ptrs_size + paca_struct_size, nr_cpu_ids); 342 } 343 344 void copy_mm_to_paca(struct mm_struct *mm) 345 { 346 #ifdef CONFIG_PPC_BOOK3S 347 mm_context_t *context = &mm->context; 348 349 #ifdef CONFIG_PPC_MM_SLICES 350 VM_BUG_ON(!mm_ctx_slb_addr_limit(context)); 351 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context), 352 LOW_SLICE_ARRAY_SZ); 353 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context), 354 TASK_SLICE_ARRAY_SZ(context)); 355 #else /* CONFIG_PPC_MM_SLICES */ 356 get_paca()->mm_ctx_user_psize = context->user_psize; 357 get_paca()->mm_ctx_sllp = context->sllp; 358 #endif 359 #else /* !CONFIG_PPC_BOOK3S */ 360 return; 361 #endif 362 } 363