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 18 #include "setup.h" 19 20 #ifndef CONFIG_SMP 21 #define boot_cpuid 0 22 #endif 23 24 static void *__init alloc_paca_data(unsigned long size, unsigned long align, 25 unsigned long limit, int cpu) 26 { 27 void *ptr; 28 int nid; 29 30 /* 31 * boot_cpuid paca is allocated very early before cpu_to_node is up. 32 * Set bottom-up mode, because the boot CPU should be on node-0, 33 * which will put its paca in the right place. 34 */ 35 if (cpu == boot_cpuid) { 36 nid = NUMA_NO_NODE; 37 memblock_set_bottom_up(true); 38 } else { 39 nid = early_cpu_to_node(cpu); 40 } 41 42 ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 43 limit, nid); 44 if (!ptr) 45 panic("cannot allocate paca data"); 46 47 if (cpu == boot_cpuid) 48 memblock_set_bottom_up(false); 49 50 return ptr; 51 } 52 53 #ifdef CONFIG_PPC_PSERIES 54 55 /* 56 * See asm/lppaca.h for more detail. 57 * 58 * lppaca structures must must be 1kB in size, L1 cache line aligned, 59 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy 60 * these requirements. 61 */ 62 static inline void init_lppaca(struct lppaca *lppaca) 63 { 64 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 65 66 *lppaca = (struct lppaca) { 67 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ 68 .size = cpu_to_be16(0x400), 69 .fpregs_in_use = 1, 70 .slb_count = cpu_to_be16(64), 71 .vmxregs_in_use = 0, 72 .page_ins = 0, }; 73 }; 74 75 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) 76 { 77 struct lppaca *lp; 78 size_t size = 0x400; 79 80 BUILD_BUG_ON(size < sizeof(struct lppaca)); 81 82 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 83 return NULL; 84 85 lp = alloc_paca_data(size, 0x400, limit, cpu); 86 init_lppaca(lp); 87 88 return lp; 89 } 90 #endif /* CONFIG_PPC_BOOK3S */ 91 92 #ifdef CONFIG_PPC_BOOK3S_64 93 94 /* 95 * 3 persistent SLBs are allocated here. The buffer will be zero 96 * initially, hence will all be invaild until we actually write them. 97 * 98 * If you make the number of persistent SLB entries dynamic, please also 99 * update PR KVM to flush and restore them accordingly. 100 */ 101 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) 102 { 103 struct slb_shadow *s; 104 105 if (cpu != boot_cpuid) { 106 /* 107 * Boot CPU comes here before early_radix_enabled 108 * is parsed (e.g., for disable_radix). So allocate 109 * always and this will be fixed up in free_unused_pacas. 110 */ 111 if (early_radix_enabled()) 112 return NULL; 113 } 114 115 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); 116 117 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 118 s->buffer_length = cpu_to_be32(sizeof(*s)); 119 120 return s; 121 } 122 123 #endif /* CONFIG_PPC_BOOK3S_64 */ 124 125 /* The Paca is an array with one entry per processor. Each contains an 126 * lppaca, which contains the information shared between the 127 * hypervisor and Linux. 128 * On systems with hardware multi-threading, there are two threads 129 * per processor. The Paca array must contain an entry for each thread. 130 * The VPD Areas will give a max logical processors = 2 * max physical 131 * processors. The processor VPD array needs one entry per physical 132 * processor (not thread). 133 */ 134 struct paca_struct **paca_ptrs __read_mostly; 135 EXPORT_SYMBOL(paca_ptrs); 136 137 void __init initialise_paca(struct paca_struct *new_paca, int cpu) 138 { 139 #ifdef CONFIG_PPC_PSERIES 140 new_paca->lppaca_ptr = NULL; 141 #endif 142 #ifdef CONFIG_PPC_BOOK3E 143 new_paca->kernel_pgd = swapper_pg_dir; 144 #endif 145 new_paca->lock_token = 0x8000; 146 new_paca->paca_index = cpu; 147 new_paca->kernel_toc = kernel_toc_addr(); 148 new_paca->kernelbase = (unsigned long) _stext; 149 /* Only set MSR:IR/DR when MMU is initialized */ 150 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 151 new_paca->hw_cpu_id = 0xffff; 152 new_paca->kexec_state = KEXEC_STATE_NONE; 153 new_paca->__current = &init_task; 154 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 155 #ifdef CONFIG_PPC_BOOK3S_64 156 new_paca->slb_shadow_ptr = NULL; 157 #endif 158 159 #ifdef CONFIG_PPC_BOOK3E 160 /* For now -- if we have threads this will be adjusted later */ 161 new_paca->tcd_ptr = &new_paca->tcd; 162 #endif 163 } 164 165 /* Put the paca pointer into r13 and SPRG_PACA */ 166 void setup_paca(struct paca_struct *new_paca) 167 { 168 /* Setup r13 */ 169 local_paca = new_paca; 170 171 #ifdef CONFIG_PPC_BOOK3E 172 /* On Book3E, initialize the TLB miss exception frames */ 173 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 174 #else 175 /* In HV mode, we setup both HPACA and PACA to avoid problems 176 * if we do a GET_PACA() before the feature fixups have been 177 * applied 178 */ 179 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 180 mtspr(SPRN_SPRG_HPACA, local_paca); 181 #endif 182 mtspr(SPRN_SPRG_PACA, local_paca); 183 184 } 185 186 static int __initdata paca_nr_cpu_ids; 187 static int __initdata paca_ptrs_size; 188 static int __initdata paca_struct_size; 189 190 void __init allocate_paca_ptrs(void) 191 { 192 paca_nr_cpu_ids = nr_cpu_ids; 193 194 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 195 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES); 196 if (!paca_ptrs) 197 panic("Failed to allocate %d bytes for paca pointers\n", 198 paca_ptrs_size); 199 200 memset(paca_ptrs, 0x88, paca_ptrs_size); 201 } 202 203 void __init allocate_paca(int cpu) 204 { 205 u64 limit; 206 struct paca_struct *paca; 207 208 BUG_ON(cpu >= paca_nr_cpu_ids); 209 210 #ifdef CONFIG_PPC_BOOK3S_64 211 /* 212 * We access pacas in real mode, and cannot take SLB faults 213 * on them when in virtual mode, so allocate them accordingly. 214 */ 215 limit = min(ppc64_bolted_size(), ppc64_rma_size); 216 #else 217 limit = ppc64_rma_size; 218 #endif 219 220 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, 221 limit, cpu); 222 paca_ptrs[cpu] = paca; 223 224 initialise_paca(paca, cpu); 225 #ifdef CONFIG_PPC_PSERIES 226 paca->lppaca_ptr = new_lppaca(cpu, limit); 227 #endif 228 #ifdef CONFIG_PPC_BOOK3S_64 229 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); 230 #endif 231 paca_struct_size += sizeof(struct paca_struct); 232 } 233 234 void __init free_unused_pacas(void) 235 { 236 int new_ptrs_size; 237 238 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 239 if (new_ptrs_size < paca_ptrs_size) 240 memblock_free(__pa(paca_ptrs) + new_ptrs_size, 241 paca_ptrs_size - new_ptrs_size); 242 243 paca_nr_cpu_ids = nr_cpu_ids; 244 paca_ptrs_size = new_ptrs_size; 245 246 #ifdef CONFIG_PPC_BOOK3S_64 247 if (early_radix_enabled()) { 248 /* Ugly fixup, see new_slb_shadow() */ 249 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), 250 sizeof(struct slb_shadow)); 251 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; 252 } 253 #endif 254 255 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", 256 paca_ptrs_size + paca_struct_size, nr_cpu_ids); 257 } 258 259 void copy_mm_to_paca(struct mm_struct *mm) 260 { 261 #ifdef CONFIG_PPC_BOOK3S 262 mm_context_t *context = &mm->context; 263 264 get_paca()->mm_ctx_id = context->id; 265 #ifdef CONFIG_PPC_MM_SLICES 266 VM_BUG_ON(!mm_ctx_slb_addr_limit(context)); 267 get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context); 268 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context), 269 LOW_SLICE_ARRAY_SZ); 270 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context), 271 TASK_SLICE_ARRAY_SZ(context)); 272 #else /* CONFIG_PPC_MM_SLICES */ 273 get_paca()->mm_ctx_user_psize = context->user_psize; 274 get_paca()->mm_ctx_sllp = context->sllp; 275 #endif 276 #else /* !CONFIG_PPC_BOOK3S */ 277 return; 278 #endif 279 } 280