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 15 #include <asm/lppaca.h> 16 #include <asm/paca.h> 17 #include <asm/sections.h> 18 #include <asm/pgtable.h> 19 #include <asm/kexec.h> 20 21 #include "setup.h" 22 23 #ifdef CONFIG_PPC_BOOK3S 24 25 /* 26 * The structure which the hypervisor knows about - this structure 27 * should not cross a page boundary. The vpa_init/register_vpa call 28 * is now known to fail if the lppaca structure crosses a page 29 * boundary. The lppaca is also used on POWER5 pSeries boxes. 30 * The lppaca is 640 bytes long, and cannot readily 31 * change since the hypervisor knows its layout, so a 1kB alignment 32 * will suffice to ensure that it doesn't cross a page boundary. 33 */ 34 struct lppaca lppaca[] = { 35 [0 ... (NR_LPPACAS-1)] = { 36 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ 37 .size = cpu_to_be16(sizeof(struct lppaca)), 38 .fpregs_in_use = 1, 39 .slb_count = cpu_to_be16(64), 40 .vmxregs_in_use = 0, 41 .page_ins = 0, 42 }, 43 }; 44 45 static struct lppaca *extra_lppacas; 46 static long __initdata lppaca_size; 47 48 static void __init allocate_lppacas(int nr_cpus, unsigned long limit) 49 { 50 if (nr_cpus <= NR_LPPACAS) 51 return; 52 53 lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) * 54 (nr_cpus - NR_LPPACAS)); 55 extra_lppacas = __va(memblock_alloc_base(lppaca_size, 56 PAGE_SIZE, limit)); 57 } 58 59 static struct lppaca * __init new_lppaca(int cpu) 60 { 61 struct lppaca *lp; 62 63 if (cpu < NR_LPPACAS) 64 return &lppaca[cpu]; 65 66 lp = extra_lppacas + (cpu - NR_LPPACAS); 67 *lp = lppaca[0]; 68 69 return lp; 70 } 71 72 static void __init free_lppacas(void) 73 { 74 long new_size = 0, nr; 75 76 if (!lppaca_size) 77 return; 78 nr = num_possible_cpus() - NR_LPPACAS; 79 if (nr > 0) 80 new_size = PAGE_ALIGN(nr * sizeof(struct lppaca)); 81 if (new_size >= lppaca_size) 82 return; 83 84 memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size); 85 lppaca_size = new_size; 86 } 87 88 #else 89 90 static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { } 91 static inline void free_lppacas(void) { } 92 93 #endif /* CONFIG_PPC_BOOK3S */ 94 95 #ifdef CONFIG_PPC_BOOK3S_64 96 97 /* 98 * 3 persistent SLBs are registered here. The buffer will be zero 99 * initially, hence will all be invaild until we actually write them. 100 * 101 * If you make the number of persistent SLB entries dynamic, please also 102 * update PR KVM to flush and restore them accordingly. 103 */ 104 static struct slb_shadow * __initdata slb_shadow; 105 106 static void __init allocate_slb_shadows(int nr_cpus, int limit) 107 { 108 int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus); 109 110 if (early_radix_enabled()) 111 return; 112 113 slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit)); 114 memset(slb_shadow, 0, size); 115 } 116 117 static struct slb_shadow * __init init_slb_shadow(int cpu) 118 { 119 struct slb_shadow *s; 120 121 if (early_radix_enabled()) 122 return NULL; 123 124 s = &slb_shadow[cpu]; 125 126 /* 127 * When we come through here to initialise boot_paca, the slb_shadow 128 * buffers are not allocated yet. That's OK, we'll get one later in 129 * boot, but make sure we don't corrupt memory at 0. 130 */ 131 if (!slb_shadow) 132 return NULL; 133 134 s->persistent = cpu_to_be32(SLB_NUM_BOLTED); 135 s->buffer_length = cpu_to_be32(sizeof(*s)); 136 137 return s; 138 } 139 140 #else /* !CONFIG_PPC_BOOK3S_64 */ 141 142 static void __init allocate_slb_shadows(int nr_cpus, int limit) { } 143 144 #endif /* CONFIG_PPC_BOOK3S_64 */ 145 146 /* The Paca is an array with one entry per processor. Each contains an 147 * lppaca, which contains the information shared between the 148 * hypervisor and Linux. 149 * On systems with hardware multi-threading, there are two threads 150 * per processor. The Paca array must contain an entry for each thread. 151 * The VPD Areas will give a max logical processors = 2 * max physical 152 * processors. The processor VPD array needs one entry per physical 153 * processor (not thread). 154 */ 155 struct paca_struct *paca; 156 EXPORT_SYMBOL(paca); 157 158 void __init initialise_paca(struct paca_struct *new_paca, int cpu) 159 { 160 #ifdef CONFIG_PPC_BOOK3S 161 new_paca->lppaca_ptr = new_lppaca(cpu); 162 #else 163 new_paca->kernel_pgd = swapper_pg_dir; 164 #endif 165 new_paca->lock_token = 0x8000; 166 new_paca->paca_index = cpu; 167 new_paca->kernel_toc = kernel_toc_addr(); 168 new_paca->kernelbase = (unsigned long) _stext; 169 /* Only set MSR:IR/DR when MMU is initialized */ 170 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); 171 new_paca->hw_cpu_id = 0xffff; 172 new_paca->kexec_state = KEXEC_STATE_NONE; 173 new_paca->__current = &init_task; 174 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; 175 #ifdef CONFIG_PPC_BOOK3S_64 176 new_paca->slb_shadow_ptr = init_slb_shadow(cpu); 177 #endif 178 179 #ifdef CONFIG_PPC_BOOK3E 180 /* For now -- if we have threads this will be adjusted later */ 181 new_paca->tcd_ptr = &new_paca->tcd; 182 #endif 183 } 184 185 /* Put the paca pointer into r13 and SPRG_PACA */ 186 void setup_paca(struct paca_struct *new_paca) 187 { 188 /* Setup r13 */ 189 local_paca = new_paca; 190 191 #ifdef CONFIG_PPC_BOOK3E 192 /* On Book3E, initialize the TLB miss exception frames */ 193 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 194 #else 195 /* In HV mode, we setup both HPACA and PACA to avoid problems 196 * if we do a GET_PACA() before the feature fixups have been 197 * applied 198 */ 199 if (early_cpu_has_feature(CPU_FTR_HVMODE)) 200 mtspr(SPRN_SPRG_HPACA, local_paca); 201 #endif 202 mtspr(SPRN_SPRG_PACA, local_paca); 203 204 } 205 206 static int __initdata paca_size; 207 208 void __init allocate_pacas(void) 209 { 210 u64 limit; 211 int cpu; 212 213 #ifdef CONFIG_PPC_BOOK3S_64 214 /* 215 * We access pacas in real mode, and cannot take SLB faults 216 * on them when in virtual mode, so allocate them accordingly. 217 */ 218 limit = min(ppc64_bolted_size(), ppc64_rma_size); 219 #else 220 limit = ppc64_rma_size; 221 #endif 222 223 paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); 224 225 paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit)); 226 memset(paca, 0, paca_size); 227 228 printk(KERN_DEBUG "Allocated %u bytes for %u pacas at %p\n", 229 paca_size, nr_cpu_ids, paca); 230 231 allocate_lppacas(nr_cpu_ids, limit); 232 233 allocate_slb_shadows(nr_cpu_ids, limit); 234 235 /* Can't use for_each_*_cpu, as they aren't functional yet */ 236 for (cpu = 0; cpu < nr_cpu_ids; cpu++) 237 initialise_paca(&paca[cpu], cpu); 238 } 239 240 void __init free_unused_pacas(void) 241 { 242 int new_size; 243 244 new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); 245 246 if (new_size >= paca_size) 247 return; 248 249 memblock_free(__pa(paca) + new_size, paca_size - new_size); 250 251 printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", 252 paca_size - new_size); 253 254 paca_size = new_size; 255 256 free_lppacas(); 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->context.slb_addr_limit); 267 get_paca()->mm_ctx_slb_addr_limit = mm->context.slb_addr_limit; 268 get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize; 269 memcpy(&get_paca()->mm_ctx_high_slices_psize, 270 &context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm)); 271 #else /* CONFIG_PPC_MM_SLICES */ 272 get_paca()->mm_ctx_user_psize = context->user_psize; 273 get_paca()->mm_ctx_sllp = context->sllp; 274 #endif 275 #else /* !CONFIG_PPC_BOOK3S */ 276 return; 277 #endif 278 } 279