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_64S_HASH_MMU 143 /* 144 * 3 persistent SLBs are allocated here. The buffer will be zero 145 * initially, hence will all be invaild until we actually write them. 146 * 147 * If you make the number of persistent SLB entries dynamic, please also 148 * update PR KVM to flush and restore them accordingly. 149 */ 150 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) 151 { 152 struct slb_shadow *s; 153 154 if (cpu != boot_cpuid) { 155 /* 156 * Boot CPU comes here before early_radix_enabled 157 * is parsed (e.g., for disable_radix). So allocate 158 * always and this will be fixed up in free_unused_pacas. 159 */ 160 if (early_radix_enabled()) 161 return NULL; 162 } 163 164 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); 165 166 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 167 s->buffer_length = cpu_to_be32(sizeof(*s)); 168 169 return s; 170 } 171 #endif /* CONFIG_PPC_64S_HASH_MMU */ 172 173 #ifdef CONFIG_PPC_PSERIES 174 /** 175 * new_rtas_args() - Allocates rtas args 176 * @cpu: CPU number 177 * @limit: Memory limit for this allocation 178 * 179 * Allocates a struct rtas_args and return it's pointer, 180 * if not in Hypervisor mode 181 * 182 * Return: Pointer to allocated rtas_args 183 * NULL if CPU in Hypervisor Mode 184 */ 185 static struct rtas_args * __init new_rtas_args(int cpu, unsigned long limit) 186 { 187 limit = min_t(unsigned long, limit, RTAS_INSTANTIATE_MAX); 188 189 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 190 return NULL; 191 192 return alloc_paca_data(sizeof(struct rtas_args), L1_CACHE_BYTES, 193 limit, cpu); 194 } 195 #endif /* CONFIG_PPC_PSERIES */ 196 197 /* The Paca is an array with one entry per processor. Each contains an 198 * lppaca, which contains the information shared between the 199 * hypervisor and Linux. 200 * On systems with hardware multi-threading, there are two threads 201 * per processor. The Paca array must contain an entry for each thread. 202 * The VPD Areas will give a max logical processors = 2 * max physical 203 * processors. The processor VPD array needs one entry per physical 204 * processor (not thread). 205 */ 206 struct paca_struct **paca_ptrs __read_mostly; 207 EXPORT_SYMBOL(paca_ptrs); 208 209 void __init initialise_paca(struct paca_struct *new_paca, int cpu) 210 { 211 #ifdef CONFIG_PPC_PSERIES 212 new_paca->lppaca_ptr = NULL; 213 #endif 214 #ifdef CONFIG_PPC_BOOK3E 215 new_paca->kernel_pgd = swapper_pg_dir; 216 #endif 217 new_paca->lock_token = 0x8000; 218 new_paca->paca_index = cpu; 219 new_paca->kernel_toc = kernel_toc_addr(); 220 new_paca->kernelbase = (unsigned long) _stext; 221 /* Only set MSR:IR/DR when MMU is initialized */ 222 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 223 new_paca->hw_cpu_id = 0xffff; 224 new_paca->kexec_state = KEXEC_STATE_NONE; 225 new_paca->__current = &init_task; 226 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 227 #ifdef CONFIG_PPC_64S_HASH_MMU 228 new_paca->slb_shadow_ptr = NULL; 229 #endif 230 231 #ifdef CONFIG_PPC_BOOK3E 232 /* For now -- if we have threads this will be adjusted later */ 233 new_paca->tcd_ptr = &new_paca->tcd; 234 #endif 235 236 #ifdef CONFIG_PPC_PSERIES 237 new_paca->rtas_args_reentrant = NULL; 238 #endif 239 } 240 241 /* Put the paca pointer into r13 and SPRG_PACA */ 242 void setup_paca(struct paca_struct *new_paca) 243 { 244 /* Setup r13 */ 245 local_paca = new_paca; 246 247 #ifdef CONFIG_PPC_BOOK3E 248 /* On Book3E, initialize the TLB miss exception frames */ 249 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 250 #else 251 /* 252 * In HV mode, we setup both HPACA and PACA to avoid problems 253 * if we do a GET_PACA() before the feature fixups have been 254 * applied. 255 * 256 * Normally you should test against CPU_FTR_HVMODE, but CPU features 257 * are not yet set up when we first reach here. 258 */ 259 if (mfmsr() & MSR_HV) 260 mtspr(SPRN_SPRG_HPACA, local_paca); 261 #endif 262 mtspr(SPRN_SPRG_PACA, local_paca); 263 264 } 265 266 static int __initdata paca_nr_cpu_ids; 267 static int __initdata paca_ptrs_size; 268 static int __initdata paca_struct_size; 269 270 void __init allocate_paca_ptrs(void) 271 { 272 paca_nr_cpu_ids = nr_cpu_ids; 273 274 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 275 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES); 276 if (!paca_ptrs) 277 panic("Failed to allocate %d bytes for paca pointers\n", 278 paca_ptrs_size); 279 280 memset(paca_ptrs, 0x88, paca_ptrs_size); 281 } 282 283 void __init allocate_paca(int cpu) 284 { 285 u64 limit; 286 struct paca_struct *paca; 287 288 BUG_ON(cpu >= paca_nr_cpu_ids); 289 290 #ifdef CONFIG_PPC_BOOK3S_64 291 /* 292 * We access pacas in real mode, and cannot take SLB faults 293 * on them when in virtual mode, so allocate them accordingly. 294 */ 295 limit = min(ppc64_bolted_size(), ppc64_rma_size); 296 #else 297 limit = ppc64_rma_size; 298 #endif 299 300 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, 301 limit, cpu); 302 paca_ptrs[cpu] = paca; 303 304 initialise_paca(paca, cpu); 305 #ifdef CONFIG_PPC_PSERIES 306 paca->lppaca_ptr = new_lppaca(cpu, limit); 307 #endif 308 #ifdef CONFIG_PPC_64S_HASH_MMU 309 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); 310 #endif 311 #ifdef CONFIG_PPC_PSERIES 312 paca->rtas_args_reentrant = new_rtas_args(cpu, limit); 313 #endif 314 paca_struct_size += sizeof(struct paca_struct); 315 } 316 317 void __init free_unused_pacas(void) 318 { 319 int new_ptrs_size; 320 321 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 322 if (new_ptrs_size < paca_ptrs_size) 323 memblock_phys_free(__pa(paca_ptrs) + new_ptrs_size, 324 paca_ptrs_size - new_ptrs_size); 325 326 paca_nr_cpu_ids = nr_cpu_ids; 327 paca_ptrs_size = new_ptrs_size; 328 329 #ifdef CONFIG_PPC_64S_HASH_MMU 330 if (early_radix_enabled()) { 331 /* Ugly fixup, see new_slb_shadow() */ 332 memblock_phys_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), 333 sizeof(struct slb_shadow)); 334 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; 335 } 336 #endif 337 338 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", 339 paca_ptrs_size + paca_struct_size, nr_cpu_ids); 340 } 341 342 #ifdef CONFIG_PPC_64S_HASH_MMU 343 void copy_mm_to_paca(struct mm_struct *mm) 344 { 345 mm_context_t *context = &mm->context; 346 347 #ifdef CONFIG_PPC_MM_SLICES 348 VM_BUG_ON(!mm_ctx_slb_addr_limit(context)); 349 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context), 350 LOW_SLICE_ARRAY_SZ); 351 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context), 352 TASK_SLICE_ARRAY_SZ(context)); 353 #else /* CONFIG_PPC_MM_SLICES */ 354 get_paca()->mm_ctx_user_psize = context->user_psize; 355 get_paca()->mm_ctx_sllp = context->sllp; 356 #endif 357 } 358 #endif /* CONFIG_PPC_64S_HASH_MMU */ 359