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 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 limit, 60 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 /* 71 * See Documentation/arch/powerpc/ultravisor.rst for more details. 72 * 73 * UV/HV data sharing is in PAGE_SIZE granularity. In order to 74 * minimize the number of pages shared, align the allocation to 75 * PAGE_SIZE. 76 */ 77 shared_lppaca = 78 memblock_alloc_try_nid(shared_lppaca_total_size, 79 PAGE_SIZE, MEMBLOCK_LOW_LIMIT, 80 limit, NUMA_NO_NODE); 81 if (!shared_lppaca) 82 panic("cannot allocate shared data"); 83 84 memblock_set_bottom_up(false); 85 uv_share_page(PHYS_PFN(__pa(shared_lppaca)), 86 shared_lppaca_total_size >> PAGE_SHIFT); 87 } 88 89 ptr = shared_lppaca + shared_lppaca_size; 90 shared_lppaca_size += size; 91 92 /* 93 * This is very early in boot, so no harm done if the kernel crashes at 94 * this point. 95 */ 96 BUG_ON(shared_lppaca_size > shared_lppaca_total_size); 97 98 return ptr; 99 } 100 101 /* 102 * See asm/lppaca.h for more detail. 103 * 104 * lppaca structures must must be 1kB in size, L1 cache line aligned, 105 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy 106 * these requirements. 107 */ 108 static inline void init_lppaca(struct lppaca *lppaca) 109 { 110 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 111 112 *lppaca = (struct lppaca) { 113 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ 114 .size = cpu_to_be16(LPPACA_SIZE), 115 .fpregs_in_use = 1, 116 .slb_count = cpu_to_be16(64), 117 .vmxregs_in_use = 0, 118 .page_ins = 0, }; 119 }; 120 121 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) 122 { 123 struct lppaca *lp; 124 125 BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE); 126 127 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 128 return NULL; 129 130 if (is_secure_guest()) 131 lp = alloc_shared_lppaca(LPPACA_SIZE, limit, cpu); 132 else 133 lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu); 134 135 init_lppaca(lp); 136 137 return lp; 138 } 139 #endif /* CONFIG_PPC_PSERIES */ 140 141 #ifdef CONFIG_PPC_64S_HASH_MMU 142 /* 143 * 3 persistent SLBs are allocated here. The buffer will be zero 144 * initially, hence will all be invaild until we actually write them. 145 * 146 * If you make the number of persistent SLB entries dynamic, please also 147 * update PR KVM to flush and restore them accordingly. 148 */ 149 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) 150 { 151 struct slb_shadow *s; 152 153 if (cpu != boot_cpuid) { 154 /* 155 * Boot CPU comes here before early_radix_enabled 156 * is parsed (e.g., for disable_radix). So allocate 157 * always and this will be fixed up in free_unused_pacas. 158 */ 159 if (early_radix_enabled()) 160 return NULL; 161 } 162 163 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); 164 165 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 166 s->buffer_length = cpu_to_be32(sizeof(*s)); 167 168 return s; 169 } 170 #endif /* CONFIG_PPC_64S_HASH_MMU */ 171 172 /* The Paca is an array with one entry per processor. Each contains an 173 * lppaca, which contains the information shared between the 174 * hypervisor and Linux. 175 * On systems with hardware multi-threading, there are two threads 176 * per processor. The Paca array must contain an entry for each thread. 177 * The VPD Areas will give a max logical processors = 2 * max physical 178 * processors. The processor VPD array needs one entry per physical 179 * processor (not thread). 180 */ 181 struct paca_struct **paca_ptrs __read_mostly; 182 EXPORT_SYMBOL(paca_ptrs); 183 184 void __init initialise_paca(struct paca_struct *new_paca, int cpu) 185 { 186 #ifdef CONFIG_PPC_PSERIES 187 new_paca->lppaca_ptr = NULL; 188 #endif 189 #ifdef CONFIG_PPC_BOOK3E_64 190 new_paca->kernel_pgd = swapper_pg_dir; 191 #endif 192 new_paca->lock_token = 0x8000; 193 new_paca->paca_index = cpu; 194 #ifndef CONFIG_PPC_KERNEL_PCREL 195 new_paca->kernel_toc = kernel_toc_addr(); 196 #endif 197 new_paca->kernelbase = (unsigned long) _stext; 198 /* Only set MSR:IR/DR when MMU is initialized */ 199 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 200 new_paca->hw_cpu_id = 0xffff; 201 new_paca->kexec_state = KEXEC_STATE_NONE; 202 new_paca->__current = &init_task; 203 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 204 #ifdef CONFIG_PPC_64S_HASH_MMU 205 new_paca->slb_shadow_ptr = NULL; 206 #endif 207 208 #ifdef CONFIG_PPC_BOOK3E_64 209 /* For now -- if we have threads this will be adjusted later */ 210 new_paca->tcd_ptr = &new_paca->tcd; 211 #endif 212 } 213 214 /* Put the paca pointer into r13 and SPRG_PACA */ 215 void setup_paca(struct paca_struct *new_paca) 216 { 217 /* Setup r13 */ 218 local_paca = new_paca; 219 220 #ifdef CONFIG_PPC_BOOK3E_64 221 /* On Book3E, initialize the TLB miss exception frames */ 222 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 223 #else 224 /* 225 * In HV mode, we setup both HPACA and PACA to avoid problems 226 * if we do a GET_PACA() before the feature fixups have been 227 * applied. 228 * 229 * Normally you should test against CPU_FTR_HVMODE, but CPU features 230 * are not yet set up when we first reach here. 231 */ 232 if (mfmsr() & MSR_HV) 233 mtspr(SPRN_SPRG_HPACA, local_paca); 234 #endif 235 mtspr(SPRN_SPRG_PACA, local_paca); 236 237 } 238 239 static int __initdata paca_nr_cpu_ids; 240 static int __initdata paca_ptrs_size; 241 static int __initdata paca_struct_size; 242 243 void __init allocate_paca_ptrs(void) 244 { 245 paca_nr_cpu_ids = nr_cpu_ids; 246 247 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 248 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES); 249 if (!paca_ptrs) 250 panic("Failed to allocate %d bytes for paca pointers\n", 251 paca_ptrs_size); 252 253 memset(paca_ptrs, 0x88, paca_ptrs_size); 254 } 255 256 void __init allocate_paca(int cpu) 257 { 258 u64 limit; 259 struct paca_struct *paca; 260 261 BUG_ON(cpu >= paca_nr_cpu_ids); 262 263 #ifdef CONFIG_PPC_BOOK3S_64 264 /* 265 * We access pacas in real mode, and cannot take SLB faults 266 * on them when in virtual mode, so allocate them accordingly. 267 */ 268 limit = min(ppc64_bolted_size(), ppc64_rma_size); 269 #else 270 limit = ppc64_rma_size; 271 #endif 272 273 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, 274 limit, cpu); 275 paca_ptrs[cpu] = paca; 276 277 initialise_paca(paca, cpu); 278 #ifdef CONFIG_PPC_PSERIES 279 paca->lppaca_ptr = new_lppaca(cpu, limit); 280 #endif 281 #ifdef CONFIG_PPC_64S_HASH_MMU 282 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); 283 #endif 284 paca_struct_size += sizeof(struct paca_struct); 285 } 286 287 void __init free_unused_pacas(void) 288 { 289 int new_ptrs_size; 290 291 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 292 if (new_ptrs_size < paca_ptrs_size) 293 memblock_phys_free(__pa(paca_ptrs) + new_ptrs_size, 294 paca_ptrs_size - new_ptrs_size); 295 296 paca_nr_cpu_ids = nr_cpu_ids; 297 paca_ptrs_size = new_ptrs_size; 298 299 #ifdef CONFIG_PPC_64S_HASH_MMU 300 if (early_radix_enabled()) { 301 /* Ugly fixup, see new_slb_shadow() */ 302 memblock_phys_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), 303 sizeof(struct slb_shadow)); 304 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; 305 } 306 #endif 307 308 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", 309 paca_ptrs_size + paca_struct_size, nr_cpu_ids); 310 } 311 312 #ifdef CONFIG_PPC_64S_HASH_MMU 313 void copy_mm_to_paca(struct mm_struct *mm) 314 { 315 mm_context_t *context = &mm->context; 316 317 VM_BUG_ON(!mm_ctx_slb_addr_limit(context)); 318 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context), 319 LOW_SLICE_ARRAY_SZ); 320 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context), 321 TASK_SLICE_ARRAY_SZ(context)); 322 } 323 #endif /* CONFIG_PPC_64S_HASH_MMU */ 324