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Commit | Line | Data |
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1da177e4 LT |
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 | ||
2cd947f1 | 10 | #include <linux/smp.h> |
4b16f8e2 | 11 | #include <linux/export.h> |
95f72d1e | 12 | #include <linux/memblock.h> |
9164bb4a | 13 | #include <linux/sched/task.h> |
1da177e4 | 14 | |
1da177e4 | 15 | #include <asm/lppaca.h> |
1da177e4 | 16 | #include <asm/paca.h> |
549e8152 | 17 | #include <asm/sections.h> |
dce6670a | 18 | #include <asm/pgtable.h> |
1fc711f7 | 19 | #include <asm/kexec.h> |
1da177e4 | 20 | |
1af19331 NP |
21 | #include "setup.h" |
22 | ||
4890aea6 NP |
23 | #ifndef CONFIG_SMP |
24 | #define boot_cpuid 0 | |
25 | #endif | |
26 | ||
27 | static 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 | * boot_cpuid paca is allocated very early before cpu_to_node is up. | |
35 | * Set bottom-up mode, because the boot CPU should be on node-0, | |
36 | * which will put its paca in the right place. | |
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 | ||
8e0b634b | 58 | #ifdef CONFIG_PPC_PSERIES |
91c60b5b | 59 | |
3356bb9f | 60 | /* |
499dcd41 NP |
61 | * See asm/lppaca.h for more detail. |
62 | * | |
63 | * lppaca structures must must be 1kB in size, L1 cache line aligned, | |
64 | * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy | |
65 | * these requirements. | |
3356bb9f | 66 | */ |
499dcd41 NP |
67 | static inline void init_lppaca(struct lppaca *lppaca) |
68 | { | |
69 | BUILD_BUG_ON(sizeof(struct lppaca) != 640); | |
70 | ||
71 | *lppaca = (struct lppaca) { | |
7ffcf8ec | 72 | .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ |
499dcd41 | 73 | .size = cpu_to_be16(0x400), |
3356bb9f | 74 | .fpregs_in_use = 1, |
7ffcf8ec | 75 | .slb_count = cpu_to_be16(64), |
3356bb9f | 76 | .vmxregs_in_use = 0, |
499dcd41 | 77 | .page_ins = 0, }; |
3356bb9f DG |
78 | }; |
79 | ||
499dcd41 | 80 | static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) |
93c22703 PM |
81 | { |
82 | struct lppaca *lp; | |
499dcd41 | 83 | size_t size = 0x400; |
93c22703 | 84 | |
499dcd41 | 85 | BUILD_BUG_ON(size < sizeof(struct lppaca)); |
93c22703 | 86 | |
8e0b634b NP |
87 | if (early_cpu_has_feature(CPU_FTR_HVMODE)) |
88 | return NULL; | |
93c22703 | 89 | |
4890aea6 | 90 | lp = alloc_paca_data(size, 0x400, limit, cpu); |
499dcd41 | 91 | init_lppaca(lp); |
93c22703 PM |
92 | |
93 | return lp; | |
94 | } | |
91c60b5b BH |
95 | #endif /* CONFIG_PPC_BOOK3S */ |
96 | ||
4e003747 | 97 | #ifdef CONFIG_PPC_BOOK3S_64 |
91c60b5b | 98 | |
2f6093c8 | 99 | /* |
384e8067 | 100 | * 3 persistent SLBs are allocated here. The buffer will be zero |
2f6093c8 | 101 | * initially, hence will all be invaild until we actually write them. |
d8d164a9 AG |
102 | * |
103 | * If you make the number of persistent SLB entries dynamic, please also | |
104 | * update PR KVM to flush and restore them accordingly. | |
2f6093c8 | 105 | */ |
384e8067 | 106 | static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) |
6f4441ef | 107 | { |
b68b1d74 NP |
108 | struct slb_shadow *s; |
109 | ||
384e8067 NP |
110 | if (cpu != boot_cpuid) { |
111 | /* | |
112 | * Boot CPU comes here before early_radix_enabled | |
113 | * is parsed (e.g., for disable_radix). So allocate | |
114 | * always and this will be fixed up in free_unused_pacas. | |
115 | */ | |
116 | if (early_radix_enabled()) | |
117 | return NULL; | |
118 | } | |
6f4441ef | 119 | |
4890aea6 | 120 | s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); |
384e8067 | 121 | memset(s, 0, sizeof(*s)); |
6f20e7f2 | 122 | |
6f4441ef JK |
123 | s->persistent = cpu_to_be32(SLB_NUM_BOLTED); |
124 | s->buffer_length = cpu_to_be32(sizeof(*s)); | |
125 | ||
126 | return s; | |
127 | } | |
128 | ||
4e003747 | 129 | #endif /* CONFIG_PPC_BOOK3S_64 */ |
91c60b5b | 130 | |
8882a4da | 131 | /* The Paca is an array with one entry per processor. Each contains an |
1da177e4 | 132 | * lppaca, which contains the information shared between the |
1888e7b5 | 133 | * hypervisor and Linux. |
1da177e4 LT |
134 | * On systems with hardware multi-threading, there are two threads |
135 | * per processor. The Paca array must contain an entry for each thread. | |
136 | * The VPD Areas will give a max logical processors = 2 * max physical | |
137 | * processors. The processor VPD array needs one entry per physical | |
138 | * processor (not thread). | |
139 | */ | |
d2e60075 NP |
140 | struct paca_struct **paca_ptrs __read_mostly; |
141 | EXPORT_SYMBOL(paca_ptrs); | |
90035fe3 | 142 | |
1426d5a3 ME |
143 | void __init initialise_paca(struct paca_struct *new_paca, int cpu) |
144 | { | |
8e0b634b | 145 | #ifdef CONFIG_PPC_PSERIES |
499dcd41 | 146 | new_paca->lppaca_ptr = NULL; |
8e0b634b NP |
147 | #endif |
148 | #ifdef CONFIG_PPC_BOOK3E | |
1426d5a3 | 149 | new_paca->kernel_pgd = swapper_pg_dir; |
91c60b5b | 150 | #endif |
1426d5a3 ME |
151 | new_paca->lock_token = 0x8000; |
152 | new_paca->paca_index = cpu; | |
a5cab83c | 153 | new_paca->kernel_toc = kernel_toc_addr(); |
1426d5a3 | 154 | new_paca->kernelbase = (unsigned long) _stext; |
a944a9c4 BH |
155 | /* Only set MSR:IR/DR when MMU is initialized */ |
156 | new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); | |
1426d5a3 | 157 | new_paca->hw_cpu_id = 0xffff; |
1fc711f7 | 158 | new_paca->kexec_state = KEXEC_STATE_NONE; |
1426d5a3 | 159 | new_paca->__current = &init_task; |
407821a3 | 160 | new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; |
4e003747 | 161 | #ifdef CONFIG_PPC_BOOK3S_64 |
384e8067 | 162 | new_paca->slb_shadow_ptr = NULL; |
4e003747 | 163 | #endif |
28efc35f SW |
164 | |
165 | #ifdef CONFIG_PPC_BOOK3E | |
166 | /* For now -- if we have threads this will be adjusted later */ | |
167 | new_paca->tcd_ptr = &new_paca->tcd; | |
168 | #endif | |
1426d5a3 ME |
169 | } |
170 | ||
fc53b420 ME |
171 | /* Put the paca pointer into r13 and SPRG_PACA */ |
172 | void setup_paca(struct paca_struct *new_paca) | |
173 | { | |
2dd60d79 | 174 | /* Setup r13 */ |
fc53b420 | 175 | local_paca = new_paca; |
2dd60d79 | 176 | |
fc53b420 | 177 | #ifdef CONFIG_PPC_BOOK3E |
2dd60d79 | 178 | /* On Book3E, initialize the TLB miss exception frames */ |
fc53b420 | 179 | mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); |
2dd60d79 BH |
180 | #else |
181 | /* In HV mode, we setup both HPACA and PACA to avoid problems | |
182 | * if we do a GET_PACA() before the feature fixups have been | |
183 | * applied | |
184 | */ | |
b8f1b4f8 | 185 | if (early_cpu_has_feature(CPU_FTR_HVMODE)) |
2dd60d79 | 186 | mtspr(SPRN_SPRG_HPACA, local_paca); |
fc53b420 | 187 | #endif |
2dd60d79 BH |
188 | mtspr(SPRN_SPRG_PACA, local_paca); |
189 | ||
fc53b420 ME |
190 | } |
191 | ||
d2e60075 NP |
192 | static int __initdata paca_nr_cpu_ids; |
193 | static int __initdata paca_ptrs_size; | |
59f57774 NP |
194 | static int __initdata paca_struct_size; |
195 | ||
196 | void __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; | |
7e1c4e27 | 201 | paca_ptrs = __va(memblock_phys_alloc(paca_ptrs_size, SMP_CACHE_BYTES)); |
59f57774 NP |
202 | memset(paca_ptrs, 0x88, paca_ptrs_size); |
203 | } | |
1426d5a3 | 204 | |
59f57774 | 205 | void __init allocate_paca(int cpu) |
1426d5a3 | 206 | { |
ecc4999f | 207 | u64 limit; |
59f57774 NP |
208 | struct paca_struct *paca; |
209 | ||
210 | BUG_ON(cpu >= paca_nr_cpu_ids); | |
1426d5a3 | 211 | |
ecc4999f | 212 | #ifdef CONFIG_PPC_BOOK3S_64 |
1426d5a3 | 213 | /* |
1af19331 NP |
214 | * We access pacas in real mode, and cannot take SLB faults |
215 | * on them when in virtual mode, so allocate them accordingly. | |
1426d5a3 | 216 | */ |
1af19331 NP |
217 | limit = min(ppc64_bolted_size(), ppc64_rma_size); |
218 | #else | |
219 | limit = ppc64_rma_size; | |
ecc4999f | 220 | #endif |
1426d5a3 | 221 | |
4890aea6 NP |
222 | paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, |
223 | limit, cpu); | |
59f57774 NP |
224 | paca_ptrs[cpu] = paca; |
225 | memset(paca, 0, sizeof(struct paca_struct)); | |
6f4441ef | 226 | |
59f57774 | 227 | initialise_paca(paca, cpu); |
499dcd41 | 228 | #ifdef CONFIG_PPC_PSERIES |
59f57774 | 229 | paca->lppaca_ptr = new_lppaca(cpu, limit); |
384e8067 NP |
230 | #endif |
231 | #ifdef CONFIG_PPC_BOOK3S_64 | |
59f57774 | 232 | paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); |
499dcd41 | 233 | #endif |
59f57774 | 234 | paca_struct_size += sizeof(struct paca_struct); |
1426d5a3 ME |
235 | } |
236 | ||
237 | void __init free_unused_pacas(void) | |
238 | { | |
d2e60075 | 239 | int new_ptrs_size; |
1426d5a3 | 240 | |
d2e60075 | 241 | new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; |
59f57774 | 242 | if (new_ptrs_size < paca_ptrs_size) |
d2e60075 NP |
243 | memblock_free(__pa(paca_ptrs) + new_ptrs_size, |
244 | paca_ptrs_size - new_ptrs_size); | |
1426d5a3 | 245 | |
d2e60075 NP |
246 | paca_nr_cpu_ids = nr_cpu_ids; |
247 | paca_ptrs_size = new_ptrs_size; | |
1426d5a3 | 248 | |
384e8067 NP |
249 | #ifdef CONFIG_PPC_BOOK3S_64 |
250 | if (early_radix_enabled()) { | |
251 | /* Ugly fixup, see new_slb_shadow() */ | |
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 | |
93c22703 | 257 | |
59f57774 NP |
258 | printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", |
259 | paca_ptrs_size + paca_struct_size, nr_cpu_ids); | |
90035fe3 | 260 | } |
52b1e665 AK |
261 | |
262 | void 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 | |
4722476b NP |
269 | VM_BUG_ON(!mm->context.slb_addr_limit); |
270 | get_paca()->mm_ctx_slb_addr_limit = mm->context.slb_addr_limit; | |
15472423 CL |
271 | memcpy(&get_paca()->mm_ctx_low_slices_psize, |
272 | &context->low_slices_psize, sizeof(context->low_slices_psize)); | |
52b1e665 | 273 | memcpy(&get_paca()->mm_ctx_high_slices_psize, |
957b778a | 274 | &context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm)); |
52b1e665 AK |
275 | #else /* CONFIG_PPC_MM_SLICES */ |
276 | get_paca()->mm_ctx_user_psize = context->user_psize; | |
277 | get_paca()->mm_ctx_sllp = context->sllp; | |
278 | #endif | |
4e003747 | 279 | #else /* !CONFIG_PPC_BOOK3S */ |
52b1e665 AK |
280 | return; |
281 | #endif | |
282 | } |