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 12 #include <asm/lppaca.h> 13 #include <asm/paca.h> 14 #include <asm/sections.h> 15 #include <asm/pgtable.h> 16 #include <asm/kexec.h> 17 #include <asm/svm.h> 18 #include <asm/ultravisor.h> 19 20 #include "setup.h" 21 22 #ifndef CONFIG_SMP 23 #define boot_cpuid 0 24 #endif 25 26 static void *__init alloc_paca_data(unsigned long size, unsigned long align, 27 unsigned long limit, int cpu) 28 { 29 void *ptr; 30 int nid; 31 32 /* 33 * boot_cpuid paca is allocated very early before cpu_to_node is up. 34 * Set bottom-up mode, because the boot CPU should be on node-0, 35 * which will put its paca in the right place. 36 */ 37 if (cpu == boot_cpuid) { 38 nid = NUMA_NO_NODE; 39 memblock_set_bottom_up(true); 40 } else { 41 nid = early_cpu_to_node(cpu); 42 } 43 44 ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 45 limit, nid); 46 if (!ptr) 47 panic("cannot allocate paca data"); 48 49 if (cpu == boot_cpuid) 50 memblock_set_bottom_up(false); 51 52 return ptr; 53 } 54 55 #ifdef CONFIG_PPC_PSERIES 56 57 #define LPPACA_SIZE 0x400 58 59 static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align, 60 unsigned long limit, int cpu) 61 { 62 size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE); 63 static unsigned long shared_lppaca_size; 64 static void *shared_lppaca; 65 void *ptr; 66 67 if (!shared_lppaca) { 68 memblock_set_bottom_up(true); 69 70 shared_lppaca = 71 memblock_alloc_try_nid(shared_lppaca_total_size, 72 PAGE_SIZE, MEMBLOCK_LOW_LIMIT, 73 limit, NUMA_NO_NODE); 74 if (!shared_lppaca) 75 panic("cannot allocate shared data"); 76 77 memblock_set_bottom_up(false); 78 uv_share_page(PHYS_PFN(__pa(shared_lppaca)), 79 shared_lppaca_total_size >> PAGE_SHIFT); 80 } 81 82 ptr = shared_lppaca + shared_lppaca_size; 83 shared_lppaca_size += size; 84 85 /* 86 * This is very early in boot, so no harm done if the kernel crashes at 87 * this point. 88 */ 89 BUG_ON(shared_lppaca_size >= shared_lppaca_total_size); 90 91 return ptr; 92 } 93 94 /* 95 * See asm/lppaca.h for more detail. 96 * 97 * lppaca structures must must be 1kB in size, L1 cache line aligned, 98 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy 99 * these requirements. 100 */ 101 static inline void init_lppaca(struct lppaca *lppaca) 102 { 103 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 104 105 *lppaca = (struct lppaca) { 106 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ 107 .size = cpu_to_be16(LPPACA_SIZE), 108 .fpregs_in_use = 1, 109 .slb_count = cpu_to_be16(64), 110 .vmxregs_in_use = 0, 111 .page_ins = 0, }; 112 }; 113 114 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) 115 { 116 struct lppaca *lp; 117 118 BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE); 119 120 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 121 return NULL; 122 123 if (is_secure_guest()) 124 lp = alloc_shared_lppaca(LPPACA_SIZE, 0x400, limit, cpu); 125 else 126 lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu); 127 128 init_lppaca(lp); 129 130 return lp; 131 } 132 #endif /* CONFIG_PPC_PSERIES */ 133 134 #ifdef CONFIG_PPC_BOOK3S_64 135 136 /* 137 * 3 persistent SLBs are allocated here. The buffer will be zero 138 * initially, hence will all be invaild until we actually write them. 139 * 140 * If you make the number of persistent SLB entries dynamic, please also 141 * update PR KVM to flush and restore them accordingly. 142 */ 143 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) 144 { 145 struct slb_shadow *s; 146 147 if (cpu != boot_cpuid) { 148 /* 149 * Boot CPU comes here before early_radix_enabled 150 * is parsed (e.g., for disable_radix). So allocate 151 * always and this will be fixed up in free_unused_pacas. 152 */ 153 if (early_radix_enabled()) 154 return NULL; 155 } 156 157 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); 158 159 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 160 s->buffer_length = cpu_to_be32(sizeof(*s)); 161 162 return s; 163 } 164 165 #endif /* CONFIG_PPC_BOOK3S_64 */ 166 167 /* The Paca is an array with one entry per processor. Each contains an 168 * lppaca, which contains the information shared between the 169 * hypervisor and Linux. 170 * On systems with hardware multi-threading, there are two threads 171 * per processor. The Paca array must contain an entry for each thread. 172 * The VPD Areas will give a max logical processors = 2 * max physical 173 * processors. The processor VPD array needs one entry per physical 174 * processor (not thread). 175 */ 176 struct paca_struct **paca_ptrs __read_mostly; 177 EXPORT_SYMBOL(paca_ptrs); 178 179 void __init initialise_paca(struct paca_struct *new_paca, int cpu) 180 { 181 #ifdef CONFIG_PPC_PSERIES 182 new_paca->lppaca_ptr = NULL; 183 #endif 184 #ifdef CONFIG_PPC_BOOK3E 185 new_paca->kernel_pgd = swapper_pg_dir; 186 #endif 187 new_paca->lock_token = 0x8000; 188 new_paca->paca_index = cpu; 189 new_paca->kernel_toc = kernel_toc_addr(); 190 new_paca->kernelbase = (unsigned long) _stext; 191 /* Only set MSR:IR/DR when MMU is initialized */ 192 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 193 new_paca->hw_cpu_id = 0xffff; 194 new_paca->kexec_state = KEXEC_STATE_NONE; 195 new_paca->__current = &init_task; 196 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 197 #ifdef CONFIG_PPC_BOOK3S_64 198 new_paca->slb_shadow_ptr = NULL; 199 #endif 200 201 #ifdef CONFIG_PPC_BOOK3E 202 /* For now -- if we have threads this will be adjusted later */ 203 new_paca->tcd_ptr = &new_paca->tcd; 204 #endif 205 } 206 207 /* Put the paca pointer into r13 and SPRG_PACA */ 208 void setup_paca(struct paca_struct *new_paca) 209 { 210 /* Setup r13 */ 211 local_paca = new_paca; 212 213 #ifdef CONFIG_PPC_BOOK3E 214 /* On Book3E, initialize the TLB miss exception frames */ 215 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 216 #else 217 /* In HV mode, we setup both HPACA and PACA to avoid problems 218 * if we do a GET_PACA() before the feature fixups have been 219 * applied 220 */ 221 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 222 mtspr(SPRN_SPRG_HPACA, local_paca); 223 #endif 224 mtspr(SPRN_SPRG_PACA, local_paca); 225 226 } 227 228 static int __initdata paca_nr_cpu_ids; 229 static int __initdata paca_ptrs_size; 230 static int __initdata paca_struct_size; 231 232 void __init allocate_paca_ptrs(void) 233 { 234 paca_nr_cpu_ids = nr_cpu_ids; 235 236 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 237 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES); 238 if (!paca_ptrs) 239 panic("Failed to allocate %d bytes for paca pointers\n", 240 paca_ptrs_size); 241 242 memset(paca_ptrs, 0x88, paca_ptrs_size); 243 } 244 245 void __init allocate_paca(int cpu) 246 { 247 u64 limit; 248 struct paca_struct *paca; 249 250 BUG_ON(cpu >= paca_nr_cpu_ids); 251 252 #ifdef CONFIG_PPC_BOOK3S_64 253 /* 254 * We access pacas in real mode, and cannot take SLB faults 255 * on them when in virtual mode, so allocate them accordingly. 256 */ 257 limit = min(ppc64_bolted_size(), ppc64_rma_size); 258 #else 259 limit = ppc64_rma_size; 260 #endif 261 262 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, 263 limit, cpu); 264 paca_ptrs[cpu] = paca; 265 266 initialise_paca(paca, cpu); 267 #ifdef CONFIG_PPC_PSERIES 268 paca->lppaca_ptr = new_lppaca(cpu, limit); 269 #endif 270 #ifdef CONFIG_PPC_BOOK3S_64 271 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); 272 #endif 273 paca_struct_size += sizeof(struct paca_struct); 274 } 275 276 void __init free_unused_pacas(void) 277 { 278 int new_ptrs_size; 279 280 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 281 if (new_ptrs_size < paca_ptrs_size) 282 memblock_free(__pa(paca_ptrs) + new_ptrs_size, 283 paca_ptrs_size - new_ptrs_size); 284 285 paca_nr_cpu_ids = nr_cpu_ids; 286 paca_ptrs_size = new_ptrs_size; 287 288 #ifdef CONFIG_PPC_BOOK3S_64 289 if (early_radix_enabled()) { 290 /* Ugly fixup, see new_slb_shadow() */ 291 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), 292 sizeof(struct slb_shadow)); 293 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; 294 } 295 #endif 296 297 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", 298 paca_ptrs_size + paca_struct_size, nr_cpu_ids); 299 } 300 301 void copy_mm_to_paca(struct mm_struct *mm) 302 { 303 #ifdef CONFIG_PPC_BOOK3S 304 mm_context_t *context = &mm->context; 305 306 get_paca()->mm_ctx_id = context->id; 307 #ifdef CONFIG_PPC_MM_SLICES 308 VM_BUG_ON(!mm_ctx_slb_addr_limit(context)); 309 get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context); 310 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context), 311 LOW_SLICE_ARRAY_SZ); 312 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context), 313 TASK_SLICE_ARRAY_SZ(context)); 314 #else /* CONFIG_PPC_MM_SLICES */ 315 get_paca()->mm_ctx_user_psize = context->user_psize; 316 get_paca()->mm_ctx_sllp = context->sllp; 317 #endif 318 #else /* !CONFIG_PPC_BOOK3S */ 319 return; 320 #endif 321 } 322