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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * c 2001 PPC 64 Team, IBM Corp
4 */
5
6#include <linux/smp.h>
7#include <linux/export.h>
8#include <linux/memblock.h>
9#include <linux/sched/task.h>
10#include <linux/numa.h>
11#include <linux/pgtable.h>
12
13#include <asm/lppaca.h>
14#include <asm/paca.h>
15#include <asm/sections.h>
16#include <asm/kexec.h>
17#include <asm/svm.h>
18#include <asm/ultravisor.h>
19
20#include "setup.h"
21
22#ifndef CONFIG_SMP
23#define boot_cpuid 0
24#endif
25
26static void *__init alloc_paca_data(unsigned long size, unsigned long align,
27 unsigned long limit, int cpu)
28{
29 void *ptr;
30 int nid;
31
32 /*
33 * boot_cpuid paca is allocated very early before cpu_to_node is up.
34 * Set bottom-up mode, because the boot CPU should be on node-0,
35 * which will put its paca in the right place.
36 */
37 if (cpu == boot_cpuid) {
38 nid = NUMA_NO_NODE;
39 memblock_set_bottom_up(true);
40 } else {
41 nid = early_cpu_to_node(cpu);
42 }
43
44 ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
45 limit, nid);
46 if (!ptr)
47 panic("cannot allocate paca data");
48
49 if (cpu == boot_cpuid)
50 memblock_set_bottom_up(false);
51
52 return ptr;
53}
54
55#ifdef CONFIG_PPC_PSERIES
56
57#define LPPACA_SIZE 0x400
58
59static void *__init alloc_shared_lppaca(unsigned long size, unsigned long limit,
60 int cpu)
61{
62 size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE);
63 static unsigned long shared_lppaca_size;
64 static void *shared_lppaca;
65 void *ptr;
66
67 if (!shared_lppaca) {
68 memblock_set_bottom_up(true);
69
70 /*
71 * See Documentation/powerpc/ultravisor.rst for more details.
72 *
73 * UV/HV data sharing is in PAGE_SIZE granularity. In order to
74 * minimize the number of pages shared, align the allocation to
75 * PAGE_SIZE.
76 */
77 shared_lppaca =
78 memblock_alloc_try_nid(shared_lppaca_total_size,
79 PAGE_SIZE, MEMBLOCK_LOW_LIMIT,
80 limit, NUMA_NO_NODE);
81 if (!shared_lppaca)
82 panic("cannot allocate shared data");
83
84 memblock_set_bottom_up(false);
85 uv_share_page(PHYS_PFN(__pa(shared_lppaca)),
86 shared_lppaca_total_size >> PAGE_SHIFT);
87 }
88
89 ptr = shared_lppaca + shared_lppaca_size;
90 shared_lppaca_size += size;
91
92 /*
93 * This is very early in boot, so no harm done if the kernel crashes at
94 * this point.
95 */
96 BUG_ON(shared_lppaca_size > shared_lppaca_total_size);
97
98 return ptr;
99}
100
101/*
102 * See asm/lppaca.h for more detail.
103 *
104 * lppaca structures must must be 1kB in size, L1 cache line aligned,
105 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
106 * these requirements.
107 */
108static inline void init_lppaca(struct lppaca *lppaca)
109{
110 BUILD_BUG_ON(sizeof(struct lppaca) != 640);
111
112 *lppaca = (struct lppaca) {
113 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */
114 .size = cpu_to_be16(LPPACA_SIZE),
115 .fpregs_in_use = 1,
116 .slb_count = cpu_to_be16(64),
117 .vmxregs_in_use = 0,
118 .page_ins = 0, };
119};
120
121static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
122{
123 struct lppaca *lp;
124
125 BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE);
126
127 if (early_cpu_has_feature(CPU_FTR_HVMODE))
128 return NULL;
129
130 if (is_secure_guest())
131 lp = alloc_shared_lppaca(LPPACA_SIZE, limit, cpu);
132 else
133 lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);
134
135 init_lppaca(lp);
136
137 return lp;
138}
139#endif /* CONFIG_PPC_PSERIES */
140
141#ifdef CONFIG_PPC_64S_HASH_MMU
142/*
143 * 3 persistent SLBs are allocated here. The buffer will be zero
144 * initially, hence will all be invaild until we actually write them.
145 *
146 * If you make the number of persistent SLB entries dynamic, please also
147 * update PR KVM to flush and restore them accordingly.
148 */
149static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
150{
151 struct slb_shadow *s;
152
153 if (cpu != boot_cpuid) {
154 /*
155 * Boot CPU comes here before early_radix_enabled
156 * is parsed (e.g., for disable_radix). So allocate
157 * always and this will be fixed up in free_unused_pacas.
158 */
159 if (early_radix_enabled())
160 return NULL;
161 }
162
163 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu);
164
165 s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
166 s->buffer_length = cpu_to_be32(sizeof(*s));
167
168 return s;
169}
170#endif /* CONFIG_PPC_64S_HASH_MMU */
171
172/* The Paca is an array with one entry per processor. Each contains an
173 * lppaca, which contains the information shared between the
174 * hypervisor and Linux.
175 * On systems with hardware multi-threading, there are two threads
176 * per processor. The Paca array must contain an entry for each thread.
177 * The VPD Areas will give a max logical processors = 2 * max physical
178 * processors. The processor VPD array needs one entry per physical
179 * processor (not thread).
180 */
181struct paca_struct **paca_ptrs __read_mostly;
182EXPORT_SYMBOL(paca_ptrs);
183
184void __init initialise_paca(struct paca_struct *new_paca, int cpu)
185{
186#ifdef CONFIG_PPC_PSERIES
187 new_paca->lppaca_ptr = NULL;
188#endif
189#ifdef CONFIG_PPC_BOOK3E_64
190 new_paca->kernel_pgd = swapper_pg_dir;
191#endif
192 new_paca->lock_token = 0x8000;
193 new_paca->paca_index = cpu;
194 new_paca->kernel_toc = kernel_toc_addr();
195 new_paca->kernelbase = (unsigned long) _stext;
196 /* Only set MSR:IR/DR when MMU is initialized */
197 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
198 new_paca->hw_cpu_id = 0xffff;
199 new_paca->kexec_state = KEXEC_STATE_NONE;
200 new_paca->__current = &init_task;
201 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
202#ifdef CONFIG_PPC_64S_HASH_MMU
203 new_paca->slb_shadow_ptr = NULL;
204#endif
205
206#ifdef CONFIG_PPC_BOOK3E_64
207 /* For now -- if we have threads this will be adjusted later */
208 new_paca->tcd_ptr = &new_paca->tcd;
209#endif
210}
211
212/* Put the paca pointer into r13 and SPRG_PACA */
213void setup_paca(struct paca_struct *new_paca)
214{
215 /* Setup r13 */
216 local_paca = new_paca;
217
218#ifdef CONFIG_PPC_BOOK3E_64
219 /* On Book3E, initialize the TLB miss exception frames */
220 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
221#else
222 /*
223 * In HV mode, we setup both HPACA and PACA to avoid problems
224 * if we do a GET_PACA() before the feature fixups have been
225 * applied.
226 *
227 * Normally you should test against CPU_FTR_HVMODE, but CPU features
228 * are not yet set up when we first reach here.
229 */
230 if (mfmsr() & MSR_HV)
231 mtspr(SPRN_SPRG_HPACA, local_paca);
232#endif
233 mtspr(SPRN_SPRG_PACA, local_paca);
234
235}
236
237static int __initdata paca_nr_cpu_ids;
238static int __initdata paca_ptrs_size;
239static int __initdata paca_struct_size;
240
241void __init allocate_paca_ptrs(void)
242{
243 paca_nr_cpu_ids = nr_cpu_ids;
244
245 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
246 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES);
247 if (!paca_ptrs)
248 panic("Failed to allocate %d bytes for paca pointers\n",
249 paca_ptrs_size);
250
251 memset(paca_ptrs, 0x88, paca_ptrs_size);
252}
253
254void __init allocate_paca(int cpu)
255{
256 u64 limit;
257 struct paca_struct *paca;
258
259 BUG_ON(cpu >= paca_nr_cpu_ids);
260
261#ifdef CONFIG_PPC_BOOK3S_64
262 /*
263 * We access pacas in real mode, and cannot take SLB faults
264 * on them when in virtual mode, so allocate them accordingly.
265 */
266 limit = min(ppc64_bolted_size(), ppc64_rma_size);
267#else
268 limit = ppc64_rma_size;
269#endif
270
271 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
272 limit, cpu);
273 paca_ptrs[cpu] = paca;
274
275 initialise_paca(paca, cpu);
276#ifdef CONFIG_PPC_PSERIES
277 paca->lppaca_ptr = new_lppaca(cpu, limit);
278#endif
279#ifdef CONFIG_PPC_64S_HASH_MMU
280 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
281#endif
282 paca_struct_size += sizeof(struct paca_struct);
283}
284
285void __init free_unused_pacas(void)
286{
287 int new_ptrs_size;
288
289 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
290 if (new_ptrs_size < paca_ptrs_size)
291 memblock_phys_free(__pa(paca_ptrs) + new_ptrs_size,
292 paca_ptrs_size - new_ptrs_size);
293
294 paca_nr_cpu_ids = nr_cpu_ids;
295 paca_ptrs_size = new_ptrs_size;
296
297#ifdef CONFIG_PPC_64S_HASH_MMU
298 if (early_radix_enabled()) {
299 /* Ugly fixup, see new_slb_shadow() */
300 memblock_phys_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
301 sizeof(struct slb_shadow));
302 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
303 }
304#endif
305
306 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
307 paca_ptrs_size + paca_struct_size, nr_cpu_ids);
308}
309
310#ifdef CONFIG_PPC_64S_HASH_MMU
311void copy_mm_to_paca(struct mm_struct *mm)
312{
313 mm_context_t *context = &mm->context;
314
315 VM_BUG_ON(!mm_ctx_slb_addr_limit(context));
316 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context),
317 LOW_SLICE_ARRAY_SZ);
318 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context),
319 TASK_SLICE_ARRAY_SZ(context));
320}
321#endif /* CONFIG_PPC_64S_HASH_MMU */
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#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 * 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
58#ifdef CONFIG_PPC_PSERIES
59
60/*
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.
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), /* "LpPa" */
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 /* CONFIG_PPC_BOOK3S */
96
97#ifdef CONFIG_PPC_BOOK3S_64
98
99/*
100 * 3 persistent SLBs are allocated here. The buffer will be zero
101 * initially, hence will all be invaild until we actually write them.
102 *
103 * If you make the number of persistent SLB entries dynamic, please also
104 * update PR KVM to flush and restore them accordingly.
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 * 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 }
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 /* CONFIG_PPC_BOOK3S_64 */
130
131/* The Paca is an array with one entry per processor. Each contains an
132 * lppaca, which contains the information shared between the
133 * hypervisor and Linux.
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 */
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 /* Only set MSR:IR/DR when MMU is initialized */
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 /* For now -- if we have threads this will be adjusted later */
167 new_paca->tcd_ptr = &new_paca->tcd;
168#endif
169}
170
171/* Put the paca pointer into r13 and SPRG_PACA */
172void setup_paca(struct paca_struct *new_paca)
173{
174 /* Setup r13 */
175 local_paca = new_paca;
176
177#ifdef CONFIG_PPC_BOOK3E
178 /* On Book3E, initialize the TLB miss exception frames */
179 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
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 */
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 * We access pacas in real mode, and cannot take SLB faults
215 * on them when in virtual mode, so allocate them accordingly.
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 /* 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
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 /* CONFIG_PPC_MM_SLICES */
276 get_paca()->mm_ctx_user_psize = context->user_psize;
277 get_paca()->mm_ctx_sllp = context->sllp;
278#endif
279#else /* !CONFIG_PPC_BOOK3S */
280 return;
281#endif
282}