1 /* 2 * c 2001 PPC 64 Team, IBM Corp 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 */ 9 10 #include <linux/smp.h> 11 #include <linux/export.h> 12 #include <linux/memblock.h> 13 #include <linux/sched/task.h> 14 #include <linux/numa.h> 15 16 #include <asm/lppaca.h> 17 #include <asm/paca.h> 18 #include <asm/sections.h> 19 #include <asm/pgtable.h> 20 #include <asm/kexec.h> 21 22 #include "setup.h" 23 24 #ifndef CONFIG_SMP 25 #define boot_cpuid 0 26 #endif 27 28 static void *__init alloc_paca_data(unsigned long size, unsigned long align, 29 unsigned long limit, int cpu) 30 { 31 void *ptr; 32 int nid; 33 34 /* 35 * boot_cpuid paca is allocated very early before cpu_to_node is up. 36 * Set bottom-up mode, because the boot CPU should be on node-0, 37 * which will put its paca in the right place. 38 */ 39 if (cpu == boot_cpuid) { 40 nid = NUMA_NO_NODE; 41 memblock_set_bottom_up(true); 42 } else { 43 nid = early_cpu_to_node(cpu); 44 } 45 46 ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 47 limit, nid); 48 if (!ptr) 49 panic("cannot allocate paca data"); 50 51 if (cpu == boot_cpuid) 52 memblock_set_bottom_up(false); 53 54 return ptr; 55 } 56 57 #ifdef CONFIG_PPC_PSERIES 58 59 /* 60 * See asm/lppaca.h for more detail. 61 * 62 * lppaca structures must must be 1kB in size, L1 cache line aligned, 63 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy 64 * these requirements. 65 */ 66 static inline void init_lppaca(struct lppaca *lppaca) 67 { 68 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 69 70 *lppaca = (struct lppaca) { 71 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ 72 .size = cpu_to_be16(0x400), 73 .fpregs_in_use = 1, 74 .slb_count = cpu_to_be16(64), 75 .vmxregs_in_use = 0, 76 .page_ins = 0, }; 77 }; 78 79 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) 80 { 81 struct lppaca *lp; 82 size_t size = 0x400; 83 84 BUILD_BUG_ON(size < sizeof(struct lppaca)); 85 86 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 87 return NULL; 88 89 lp = alloc_paca_data(size, 0x400, limit, cpu); 90 init_lppaca(lp); 91 92 return lp; 93 } 94 #endif /* CONFIG_PPC_BOOK3S */ 95 96 #ifdef CONFIG_PPC_BOOK3S_64 97 98 /* 99 * 3 persistent SLBs are allocated here. The buffer will be zero 100 * initially, hence will all be invaild until we actually write them. 101 * 102 * If you make the number of persistent SLB entries dynamic, please also 103 * update PR KVM to flush and restore them accordingly. 104 */ 105 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) 106 { 107 struct slb_shadow *s; 108 109 if (cpu != boot_cpuid) { 110 /* 111 * Boot CPU comes here before early_radix_enabled 112 * is parsed (e.g., for disable_radix). So allocate 113 * always and this will be fixed up in free_unused_pacas. 114 */ 115 if (early_radix_enabled()) 116 return NULL; 117 } 118 119 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); 120 121 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 122 s->buffer_length = cpu_to_be32(sizeof(*s)); 123 124 return s; 125 } 126 127 #endif /* CONFIG_PPC_BOOK3S_64 */ 128 129 /* The Paca is an array with one entry per processor. Each contains an 130 * lppaca, which contains the information shared between the 131 * hypervisor and Linux. 132 * On systems with hardware multi-threading, there are two threads 133 * per processor. The Paca array must contain an entry for each thread. 134 * The VPD Areas will give a max logical processors = 2 * max physical 135 * processors. The processor VPD array needs one entry per physical 136 * processor (not thread). 137 */ 138 struct paca_struct **paca_ptrs __read_mostly; 139 EXPORT_SYMBOL(paca_ptrs); 140 141 void __init initialise_paca(struct paca_struct *new_paca, int cpu) 142 { 143 #ifdef CONFIG_PPC_PSERIES 144 new_paca->lppaca_ptr = NULL; 145 #endif 146 #ifdef CONFIG_PPC_BOOK3E 147 new_paca->kernel_pgd = swapper_pg_dir; 148 #endif 149 new_paca->lock_token = 0x8000; 150 new_paca->paca_index = cpu; 151 new_paca->kernel_toc = kernel_toc_addr(); 152 new_paca->kernelbase = (unsigned long) _stext; 153 /* Only set MSR:IR/DR when MMU is initialized */ 154 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 155 new_paca->hw_cpu_id = 0xffff; 156 new_paca->kexec_state = KEXEC_STATE_NONE; 157 new_paca->__current = &init_task; 158 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 159 #ifdef CONFIG_PPC_BOOK3S_64 160 new_paca->slb_shadow_ptr = NULL; 161 #endif 162 163 #ifdef CONFIG_PPC_BOOK3E 164 /* For now -- if we have threads this will be adjusted later */ 165 new_paca->tcd_ptr = &new_paca->tcd; 166 #endif 167 } 168 169 /* Put the paca pointer into r13 and SPRG_PACA */ 170 void setup_paca(struct paca_struct *new_paca) 171 { 172 /* Setup r13 */ 173 local_paca = new_paca; 174 175 #ifdef CONFIG_PPC_BOOK3E 176 /* On Book3E, initialize the TLB miss exception frames */ 177 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 178 #else 179 /* In HV mode, we setup both HPACA and PACA to avoid problems 180 * if we do a GET_PACA() before the feature fixups have been 181 * applied 182 */ 183 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 184 mtspr(SPRN_SPRG_HPACA, local_paca); 185 #endif 186 mtspr(SPRN_SPRG_PACA, local_paca); 187 188 } 189 190 static int __initdata paca_nr_cpu_ids; 191 static int __initdata paca_ptrs_size; 192 static int __initdata paca_struct_size; 193 194 void __init allocate_paca_ptrs(void) 195 { 196 paca_nr_cpu_ids = nr_cpu_ids; 197 198 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 199 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES); 200 if (!paca_ptrs) 201 panic("Failed to allocate %d bytes for paca pointers\n", 202 paca_ptrs_size); 203 204 memset(paca_ptrs, 0x88, paca_ptrs_size); 205 } 206 207 void __init allocate_paca(int cpu) 208 { 209 u64 limit; 210 struct paca_struct *paca; 211 212 BUG_ON(cpu >= paca_nr_cpu_ids); 213 214 #ifdef CONFIG_PPC_BOOK3S_64 215 /* 216 * We access pacas in real mode, and cannot take SLB faults 217 * on them when in virtual mode, so allocate them accordingly. 218 */ 219 limit = min(ppc64_bolted_size(), ppc64_rma_size); 220 #else 221 limit = ppc64_rma_size; 222 #endif 223 224 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, 225 limit, cpu); 226 paca_ptrs[cpu] = paca; 227 228 initialise_paca(paca, cpu); 229 #ifdef CONFIG_PPC_PSERIES 230 paca->lppaca_ptr = new_lppaca(cpu, limit); 231 #endif 232 #ifdef CONFIG_PPC_BOOK3S_64 233 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); 234 #endif 235 paca_struct_size += sizeof(struct paca_struct); 236 } 237 238 void __init free_unused_pacas(void) 239 { 240 int new_ptrs_size; 241 242 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; 243 if (new_ptrs_size < paca_ptrs_size) 244 memblock_free(__pa(paca_ptrs) + new_ptrs_size, 245 paca_ptrs_size - new_ptrs_size); 246 247 paca_nr_cpu_ids = nr_cpu_ids; 248 paca_ptrs_size = new_ptrs_size; 249 250 #ifdef CONFIG_PPC_BOOK3S_64 251 if (early_radix_enabled()) { 252 /* Ugly fixup, see new_slb_shadow() */ 253 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), 254 sizeof(struct slb_shadow)); 255 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; 256 } 257 #endif 258 259 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", 260 paca_ptrs_size + paca_struct_size, nr_cpu_ids); 261 } 262 263 void copy_mm_to_paca(struct mm_struct *mm) 264 { 265 #ifdef CONFIG_PPC_BOOK3S 266 mm_context_t *context = &mm->context; 267 268 get_paca()->mm_ctx_id = context->id; 269 #ifdef CONFIG_PPC_MM_SLICES 270 VM_BUG_ON(!mm_ctx_slb_addr_limit(context)); 271 get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context); 272 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context), 273 LOW_SLICE_ARRAY_SZ); 274 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context), 275 TASK_SLICE_ARRAY_SZ(context)); 276 #else /* CONFIG_PPC_MM_SLICES */ 277 get_paca()->mm_ctx_user_psize = context->user_psize; 278 get_paca()->mm_ctx_sllp = context->sllp; 279 #endif 280 #else /* !CONFIG_PPC_BOOK3S */ 281 return; 282 #endif 283 } 284