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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#ifndef CONFIG_SMP
24#define boot_cpuid 0
25#endif
26
27static void *__init alloc_paca_data(unsigned long size, unsigned long align,
28 unsigned long limit, int cpu)
29{
30 unsigned long pa;
31 int nid;
32
33
34
35
36
37
38 if (cpu == boot_cpuid) {
39 nid = -1;
40 memblock_set_bottom_up(true);
41 } else {
42 nid = early_cpu_to_node(cpu);
43 }
44
45 pa = memblock_alloc_base_nid(size, align, limit, nid, MEMBLOCK_NONE);
46 if (!pa) {
47 pa = memblock_alloc_base(size, align, limit);
48 if (!pa)
49 panic("cannot allocate paca data");
50 }
51
52 if (cpu == boot_cpuid)
53 memblock_set_bottom_up(false);
54
55 return __va(pa);
56}
57
58#ifdef CONFIG_PPC_PSERIES
59
60
61
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63
64
65
66
67static inline void init_lppaca(struct lppaca *lppaca)
68{
69 BUILD_BUG_ON(sizeof(struct lppaca) != 640);
70
71 *lppaca = (struct lppaca) {
72 .desc = cpu_to_be32(0xd397d781),
73 .size = cpu_to_be16(0x400),
74 .fpregs_in_use = 1,
75 .slb_count = cpu_to_be16(64),
76 .vmxregs_in_use = 0,
77 .page_ins = 0, };
78};
79
80static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
81{
82 struct lppaca *lp;
83 size_t size = 0x400;
84
85 BUILD_BUG_ON(size < sizeof(struct lppaca));
86
87 if (early_cpu_has_feature(CPU_FTR_HVMODE))
88 return NULL;
89
90 lp = alloc_paca_data(size, 0x400, limit, cpu);
91 init_lppaca(lp);
92
93 return lp;
94}
95#endif
96
97#ifdef CONFIG_PPC_BOOK3S_64
98
99
100
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102
103
104
105
106static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
107{
108 struct slb_shadow *s;
109
110 if (cpu != boot_cpuid) {
111
112
113
114
115
116 if (early_radix_enabled())
117 return NULL;
118 }
119
120 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu);
121 memset(s, 0, sizeof(*s));
122
123 s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
124 s->buffer_length = cpu_to_be32(sizeof(*s));
125
126 return s;
127}
128
129#endif
130
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137
138
139
140struct paca_struct **paca_ptrs __read_mostly;
141EXPORT_SYMBOL(paca_ptrs);
142
143void __init initialise_paca(struct paca_struct *new_paca, int cpu)
144{
145#ifdef CONFIG_PPC_PSERIES
146 new_paca->lppaca_ptr = NULL;
147#endif
148#ifdef CONFIG_PPC_BOOK3E
149 new_paca->kernel_pgd = swapper_pg_dir;
150#endif
151 new_paca->lock_token = 0x8000;
152 new_paca->paca_index = cpu;
153 new_paca->kernel_toc = kernel_toc_addr();
154 new_paca->kernelbase = (unsigned long) _stext;
155
156 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
157 new_paca->hw_cpu_id = 0xffff;
158 new_paca->kexec_state = KEXEC_STATE_NONE;
159 new_paca->__current = &init_task;
160 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
161#ifdef CONFIG_PPC_BOOK3S_64
162 new_paca->slb_shadow_ptr = NULL;
163#endif
164
165#ifdef CONFIG_PPC_BOOK3E
166
167 new_paca->tcd_ptr = &new_paca->tcd;
168#endif
169}
170
171
172void setup_paca(struct paca_struct *new_paca)
173{
174
175 local_paca = new_paca;
176
177#ifdef CONFIG_PPC_BOOK3E
178
179 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
180#else
181
182
183
184
185 if (early_cpu_has_feature(CPU_FTR_HVMODE))
186 mtspr(SPRN_SPRG_HPACA, local_paca);
187#endif
188 mtspr(SPRN_SPRG_PACA, local_paca);
189
190}
191
192static int __initdata paca_nr_cpu_ids;
193static int __initdata paca_ptrs_size;
194static int __initdata paca_struct_size;
195
196void __init allocate_paca_ptrs(void)
197{
198 paca_nr_cpu_ids = nr_cpu_ids;
199
200 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
201 paca_ptrs = __va(memblock_alloc(paca_ptrs_size, 0));
202 memset(paca_ptrs, 0x88, paca_ptrs_size);
203}
204
205void __init allocate_paca(int cpu)
206{
207 u64 limit;
208 struct paca_struct *paca;
209
210 BUG_ON(cpu >= paca_nr_cpu_ids);
211
212#ifdef CONFIG_PPC_BOOK3S_64
213
214
215
216
217 limit = min(ppc64_bolted_size(), ppc64_rma_size);
218#else
219 limit = ppc64_rma_size;
220#endif
221
222 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
223 limit, cpu);
224 paca_ptrs[cpu] = paca;
225 memset(paca, 0, sizeof(struct paca_struct));
226
227 initialise_paca(paca, cpu);
228#ifdef CONFIG_PPC_PSERIES
229 paca->lppaca_ptr = new_lppaca(cpu, limit);
230#endif
231#ifdef CONFIG_PPC_BOOK3S_64
232 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
233#endif
234 paca_struct_size += sizeof(struct paca_struct);
235}
236
237void __init free_unused_pacas(void)
238{
239 int new_ptrs_size;
240
241 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
242 if (new_ptrs_size < paca_ptrs_size)
243 memblock_free(__pa(paca_ptrs) + new_ptrs_size,
244 paca_ptrs_size - new_ptrs_size);
245
246 paca_nr_cpu_ids = nr_cpu_ids;
247 paca_ptrs_size = new_ptrs_size;
248
249#ifdef CONFIG_PPC_BOOK3S_64
250 if (early_radix_enabled()) {
251
252 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
253 sizeof(struct slb_shadow));
254 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
255 }
256#endif
257
258 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
259 paca_ptrs_size + paca_struct_size, nr_cpu_ids);
260}
261
262void copy_mm_to_paca(struct mm_struct *mm)
263{
264#ifdef CONFIG_PPC_BOOK3S
265 mm_context_t *context = &mm->context;
266
267 get_paca()->mm_ctx_id = context->id;
268#ifdef CONFIG_PPC_MM_SLICES
269 VM_BUG_ON(!mm->context.slb_addr_limit);
270 get_paca()->mm_ctx_slb_addr_limit = mm->context.slb_addr_limit;
271 memcpy(&get_paca()->mm_ctx_low_slices_psize,
272 &context->low_slices_psize, sizeof(context->low_slices_psize));
273 memcpy(&get_paca()->mm_ctx_high_slices_psize,
274 &context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm));
275#else
276 get_paca()->mm_ctx_user_psize = context->user_psize;
277 get_paca()->mm_ctx_sllp = context->sllp;
278#endif
279#else
280 return;
281#endif
282}
283