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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * c 2001 PPC 64 Team, IBM Corp | |
1da177e4 LT |
4 | */ |
5 | ||
2cd947f1 | 6 | #include <linux/smp.h> |
4b16f8e2 | 7 | #include <linux/export.h> |
95f72d1e | 8 | #include <linux/memblock.h> |
9164bb4a | 9 | #include <linux/sched/task.h> |
98fa15f3 | 10 | #include <linux/numa.h> |
1da177e4 | 11 | |
1da177e4 | 12 | #include <asm/lppaca.h> |
1da177e4 | 13 | #include <asm/paca.h> |
549e8152 | 14 | #include <asm/sections.h> |
dce6670a | 15 | #include <asm/pgtable.h> |
1fc711f7 | 16 | #include <asm/kexec.h> |
1da177e4 | 17 | |
1af19331 NP |
18 | #include "setup.h" |
19 | ||
4890aea6 NP |
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 | { | |
f806714f | 27 | void *ptr; |
4890aea6 NP |
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) { | |
98fa15f3 | 36 | nid = NUMA_NO_NODE; |
4890aea6 NP |
37 | memblock_set_bottom_up(true); |
38 | } else { | |
39 | nid = early_cpu_to_node(cpu); | |
40 | } | |
41 | ||
f806714f MR |
42 | ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, |
43 | limit, nid); | |
44 | if (!ptr) | |
45 | panic("cannot allocate paca data"); | |
4890aea6 NP |
46 | |
47 | if (cpu == boot_cpuid) | |
48 | memblock_set_bottom_up(false); | |
49 | ||
f806714f | 50 | return ptr; |
4890aea6 NP |
51 | } |
52 | ||
8e0b634b | 53 | #ifdef CONFIG_PPC_PSERIES |
91c60b5b | 54 | |
3356bb9f | 55 | /* |
499dcd41 NP |
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. | |
3356bb9f | 61 | */ |
499dcd41 NP |
62 | static inline void init_lppaca(struct lppaca *lppaca) |
63 | { | |
64 | BUILD_BUG_ON(sizeof(struct lppaca) != 640); | |
65 | ||
66 | *lppaca = (struct lppaca) { | |
7ffcf8ec | 67 | .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ |
499dcd41 | 68 | .size = cpu_to_be16(0x400), |
3356bb9f | 69 | .fpregs_in_use = 1, |
7ffcf8ec | 70 | .slb_count = cpu_to_be16(64), |
3356bb9f | 71 | .vmxregs_in_use = 0, |
499dcd41 | 72 | .page_ins = 0, }; |
3356bb9f DG |
73 | }; |
74 | ||
499dcd41 | 75 | static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) |
93c22703 PM |
76 | { |
77 | struct lppaca *lp; | |
499dcd41 | 78 | size_t size = 0x400; |
93c22703 | 79 | |
499dcd41 | 80 | BUILD_BUG_ON(size < sizeof(struct lppaca)); |
93c22703 | 81 | |
8e0b634b NP |
82 | if (early_cpu_has_feature(CPU_FTR_HVMODE)) |
83 | return NULL; | |
93c22703 | 84 | |
4890aea6 | 85 | lp = alloc_paca_data(size, 0x400, limit, cpu); |
499dcd41 | 86 | init_lppaca(lp); |
93c22703 PM |
87 | |
88 | return lp; | |
89 | } | |
91c60b5b BH |
90 | #endif /* CONFIG_PPC_BOOK3S */ |
91 | ||
4e003747 | 92 | #ifdef CONFIG_PPC_BOOK3S_64 |
91c60b5b | 93 | |
2f6093c8 | 94 | /* |
384e8067 | 95 | * 3 persistent SLBs are allocated here. The buffer will be zero |
2f6093c8 | 96 | * initially, hence will all be invaild until we actually write them. |
d8d164a9 AG |
97 | * |
98 | * If you make the number of persistent SLB entries dynamic, please also | |
99 | * update PR KVM to flush and restore them accordingly. | |
2f6093c8 | 100 | */ |
384e8067 | 101 | static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) |
6f4441ef | 102 | { |
b68b1d74 NP |
103 | struct slb_shadow *s; |
104 | ||
384e8067 NP |
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 | } | |
6f4441ef | 114 | |
4890aea6 | 115 | s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); |
6f20e7f2 | 116 | |
6f4441ef JK |
117 | s->persistent = cpu_to_be32(SLB_NUM_BOLTED); |
118 | s->buffer_length = cpu_to_be32(sizeof(*s)); | |
119 | ||
120 | return s; | |
121 | } | |
122 | ||
4e003747 | 123 | #endif /* CONFIG_PPC_BOOK3S_64 */ |
91c60b5b | 124 | |
8882a4da | 125 | /* The Paca is an array with one entry per processor. Each contains an |
1da177e4 | 126 | * lppaca, which contains the information shared between the |
1888e7b5 | 127 | * hypervisor and Linux. |
1da177e4 LT |
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 | */ | |
d2e60075 NP |
134 | struct paca_struct **paca_ptrs __read_mostly; |
135 | EXPORT_SYMBOL(paca_ptrs); | |
90035fe3 | 136 | |
1426d5a3 ME |
137 | void __init initialise_paca(struct paca_struct *new_paca, int cpu) |
138 | { | |
8e0b634b | 139 | #ifdef CONFIG_PPC_PSERIES |
499dcd41 | 140 | new_paca->lppaca_ptr = NULL; |
8e0b634b NP |
141 | #endif |
142 | #ifdef CONFIG_PPC_BOOK3E | |
1426d5a3 | 143 | new_paca->kernel_pgd = swapper_pg_dir; |
91c60b5b | 144 | #endif |
1426d5a3 ME |
145 | new_paca->lock_token = 0x8000; |
146 | new_paca->paca_index = cpu; | |
a5cab83c | 147 | new_paca->kernel_toc = kernel_toc_addr(); |
1426d5a3 | 148 | new_paca->kernelbase = (unsigned long) _stext; |
a944a9c4 BH |
149 | /* Only set MSR:IR/DR when MMU is initialized */ |
150 | new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); | |
1426d5a3 | 151 | new_paca->hw_cpu_id = 0xffff; |
1fc711f7 | 152 | new_paca->kexec_state = KEXEC_STATE_NONE; |
1426d5a3 | 153 | new_paca->__current = &init_task; |
407821a3 | 154 | new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; |
4e003747 | 155 | #ifdef CONFIG_PPC_BOOK3S_64 |
384e8067 | 156 | new_paca->slb_shadow_ptr = NULL; |
4e003747 | 157 | #endif |
28efc35f SW |
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 | |
1426d5a3 ME |
163 | } |
164 | ||
fc53b420 ME |
165 | /* Put the paca pointer into r13 and SPRG_PACA */ |
166 | void setup_paca(struct paca_struct *new_paca) | |
167 | { | |
2dd60d79 | 168 | /* Setup r13 */ |
fc53b420 | 169 | local_paca = new_paca; |
2dd60d79 | 170 | |
fc53b420 | 171 | #ifdef CONFIG_PPC_BOOK3E |
2dd60d79 | 172 | /* On Book3E, initialize the TLB miss exception frames */ |
fc53b420 | 173 | mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); |
2dd60d79 BH |
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 | */ | |
b8f1b4f8 | 179 | if (early_cpu_has_feature(CPU_FTR_HVMODE)) |
2dd60d79 | 180 | mtspr(SPRN_SPRG_HPACA, local_paca); |
fc53b420 | 181 | #endif |
2dd60d79 BH |
182 | mtspr(SPRN_SPRG_PACA, local_paca); |
183 | ||
fc53b420 ME |
184 | } |
185 | ||
d2e60075 NP |
186 | static int __initdata paca_nr_cpu_ids; |
187 | static int __initdata paca_ptrs_size; | |
59f57774 NP |
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; | |
1269f7b8 CL |
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 | ||
59f57774 NP |
200 | memset(paca_ptrs, 0x88, paca_ptrs_size); |
201 | } | |
1426d5a3 | 202 | |
59f57774 | 203 | void __init allocate_paca(int cpu) |
1426d5a3 | 204 | { |
ecc4999f | 205 | u64 limit; |
59f57774 NP |
206 | struct paca_struct *paca; |
207 | ||
208 | BUG_ON(cpu >= paca_nr_cpu_ids); | |
1426d5a3 | 209 | |
ecc4999f | 210 | #ifdef CONFIG_PPC_BOOK3S_64 |
1426d5a3 | 211 | /* |
1af19331 NP |
212 | * We access pacas in real mode, and cannot take SLB faults |
213 | * on them when in virtual mode, so allocate them accordingly. | |
1426d5a3 | 214 | */ |
1af19331 NP |
215 | limit = min(ppc64_bolted_size(), ppc64_rma_size); |
216 | #else | |
217 | limit = ppc64_rma_size; | |
ecc4999f | 218 | #endif |
1426d5a3 | 219 | |
4890aea6 NP |
220 | paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, |
221 | limit, cpu); | |
59f57774 | 222 | paca_ptrs[cpu] = paca; |
6f4441ef | 223 | |
59f57774 | 224 | initialise_paca(paca, cpu); |
499dcd41 | 225 | #ifdef CONFIG_PPC_PSERIES |
59f57774 | 226 | paca->lppaca_ptr = new_lppaca(cpu, limit); |
384e8067 NP |
227 | #endif |
228 | #ifdef CONFIG_PPC_BOOK3S_64 | |
59f57774 | 229 | paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); |
499dcd41 | 230 | #endif |
59f57774 | 231 | paca_struct_size += sizeof(struct paca_struct); |
1426d5a3 ME |
232 | } |
233 | ||
234 | void __init free_unused_pacas(void) | |
235 | { | |
d2e60075 | 236 | int new_ptrs_size; |
1426d5a3 | 237 | |
d2e60075 | 238 | new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; |
59f57774 | 239 | if (new_ptrs_size < paca_ptrs_size) |
d2e60075 NP |
240 | memblock_free(__pa(paca_ptrs) + new_ptrs_size, |
241 | paca_ptrs_size - new_ptrs_size); | |
1426d5a3 | 242 | |
d2e60075 NP |
243 | paca_nr_cpu_ids = nr_cpu_ids; |
244 | paca_ptrs_size = new_ptrs_size; | |
1426d5a3 | 245 | |
384e8067 NP |
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 | |
93c22703 | 254 | |
59f57774 NP |
255 | printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", |
256 | paca_ptrs_size + paca_struct_size, nr_cpu_ids); | |
90035fe3 | 257 | } |
52b1e665 AK |
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 | |
60458fba AK |
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)); | |
52b1e665 AK |
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 | |
4e003747 | 276 | #else /* !CONFIG_PPC_BOOK3S */ |
52b1e665 AK |
277 | return; |
278 | #endif | |
279 | } |