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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/arch/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#ifndef CONFIG_PPC_KERNEL_PCREL
195 new_paca->kernel_toc = kernel_toc_addr();
196#endif
197 new_paca->kernelbase = (unsigned long) _stext;
198 /* Only set MSR:IR/DR when MMU is initialized */
199 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
200 new_paca->hw_cpu_id = 0xffff;
201 new_paca->kexec_state = KEXEC_STATE_NONE;
202 new_paca->__current = &init_task;
203 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
204#ifdef CONFIG_PPC_64S_HASH_MMU
205 new_paca->slb_shadow_ptr = NULL;
206#endif
207
208#ifdef CONFIG_PPC_BOOK3E_64
209 /* For now -- if we have threads this will be adjusted later */
210 new_paca->tcd_ptr = &new_paca->tcd;
211#endif
212}
213
214/* Put the paca pointer into r13 and SPRG_PACA */
215void setup_paca(struct paca_struct *new_paca)
216{
217 /* Setup r13 */
218 local_paca = new_paca;
219
220#ifdef CONFIG_PPC_BOOK3E_64
221 /* On Book3E, initialize the TLB miss exception frames */
222 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
223#else
224 /*
225 * In HV mode, we setup both HPACA and PACA to avoid problems
226 * if we do a GET_PACA() before the feature fixups have been
227 * applied.
228 *
229 * Normally you should test against CPU_FTR_HVMODE, but CPU features
230 * are not yet set up when we first reach here.
231 */
232 if (mfmsr() & MSR_HV)
233 mtspr(SPRN_SPRG_HPACA, local_paca);
234#endif
235 mtspr(SPRN_SPRG_PACA, local_paca);
236
237}
238
239static int __initdata paca_nr_cpu_ids;
240static int __initdata paca_ptrs_size;
241static int __initdata paca_struct_size;
242
243void __init allocate_paca_ptrs(void)
244{
245 paca_nr_cpu_ids = nr_cpu_ids;
246
247 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
248 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES);
249 if (!paca_ptrs)
250 panic("Failed to allocate %d bytes for paca pointers\n",
251 paca_ptrs_size);
252
253 memset(paca_ptrs, 0x88, paca_ptrs_size);
254}
255
256void __init allocate_paca(int cpu)
257{
258 u64 limit;
259 struct paca_struct *paca;
260
261 BUG_ON(cpu >= paca_nr_cpu_ids);
262
263#ifdef CONFIG_PPC_BOOK3S_64
264 /*
265 * We access pacas in real mode, and cannot take SLB faults
266 * on them when in virtual mode, so allocate them accordingly.
267 */
268 limit = min(ppc64_bolted_size(), ppc64_rma_size);
269#else
270 limit = ppc64_rma_size;
271#endif
272
273 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
274 limit, cpu);
275 paca_ptrs[cpu] = paca;
276
277 initialise_paca(paca, cpu);
278#ifdef CONFIG_PPC_PSERIES
279 paca->lppaca_ptr = new_lppaca(cpu, limit);
280#endif
281#ifdef CONFIG_PPC_64S_HASH_MMU
282 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
283#endif
284 paca_struct_size += sizeof(struct paca_struct);
285}
286
287void __init free_unused_pacas(void)
288{
289 int new_ptrs_size;
290
291 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
292 if (new_ptrs_size < paca_ptrs_size)
293 memblock_phys_free(__pa(paca_ptrs) + new_ptrs_size,
294 paca_ptrs_size - new_ptrs_size);
295
296 paca_nr_cpu_ids = nr_cpu_ids;
297 paca_ptrs_size = new_ptrs_size;
298
299#ifdef CONFIG_PPC_64S_HASH_MMU
300 if (early_radix_enabled()) {
301 /* Ugly fixup, see new_slb_shadow() */
302 memblock_phys_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
303 sizeof(struct slb_shadow));
304 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
305 }
306#endif
307
308 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
309 paca_ptrs_size + paca_struct_size, nr_cpu_ids);
310}
311
312#ifdef CONFIG_PPC_64S_HASH_MMU
313void copy_mm_to_paca(struct mm_struct *mm)
314{
315 mm_context_t *context = &mm->context;
316
317 VM_BUG_ON(!mm_ctx_slb_addr_limit(context));
318 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context),
319 LOW_SLICE_ARRAY_SZ);
320 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context),
321 TASK_SLICE_ARRAY_SZ(context));
322}
323#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
14#include <asm/lppaca.h>
15#include <asm/paca.h>
16#include <asm/sections.h>
17#include <asm/pgtable.h>
18#include <asm/kexec.h>
19
20/* This symbol is provided by the linker - let it fill in the paca
21 * field correctly */
22extern unsigned long __toc_start;
23
24#ifdef CONFIG_PPC_BOOK3S
25
26/*
27 * The structure which the hypervisor knows about - this structure
28 * should not cross a page boundary. The vpa_init/register_vpa call
29 * is now known to fail if the lppaca structure crosses a page
30 * boundary. The lppaca is also used on POWER5 pSeries boxes.
31 * The lppaca is 640 bytes long, and cannot readily
32 * change since the hypervisor knows its layout, so a 1kB alignment
33 * will suffice to ensure that it doesn't cross a page boundary.
34 */
35struct lppaca lppaca[] = {
36 [0 ... (NR_LPPACAS-1)] = {
37 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */
38 .size = cpu_to_be16(sizeof(struct lppaca)),
39 .fpregs_in_use = 1,
40 .slb_count = cpu_to_be16(64),
41 .vmxregs_in_use = 0,
42 .page_ins = 0,
43 },
44};
45
46static struct lppaca *extra_lppacas;
47static long __initdata lppaca_size;
48
49static void __init allocate_lppacas(int nr_cpus, unsigned long limit)
50{
51 if (nr_cpus <= NR_LPPACAS)
52 return;
53
54 lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
55 (nr_cpus - NR_LPPACAS));
56 extra_lppacas = __va(memblock_alloc_base(lppaca_size,
57 PAGE_SIZE, limit));
58}
59
60static struct lppaca * __init new_lppaca(int cpu)
61{
62 struct lppaca *lp;
63
64 if (cpu < NR_LPPACAS)
65 return &lppaca[cpu];
66
67 lp = extra_lppacas + (cpu - NR_LPPACAS);
68 *lp = lppaca[0];
69
70 return lp;
71}
72
73static void __init free_lppacas(void)
74{
75 long new_size = 0, nr;
76
77 if (!lppaca_size)
78 return;
79 nr = num_possible_cpus() - NR_LPPACAS;
80 if (nr > 0)
81 new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
82 if (new_size >= lppaca_size)
83 return;
84
85 memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
86 lppaca_size = new_size;
87}
88
89#else
90
91static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
92static inline void free_lppacas(void) { }
93
94#endif /* CONFIG_PPC_BOOK3S */
95
96#ifdef CONFIG_PPC_STD_MMU_64
97
98/*
99 * 3 persistent SLBs are registered here. The buffer will be zero
100 * initially, hence will all be invaild until we actually write them.
101 */
102static struct slb_shadow *slb_shadow;
103
104static void __init allocate_slb_shadows(int nr_cpus, int limit)
105{
106 int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus);
107 slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit));
108 memset(slb_shadow, 0, size);
109}
110
111static struct slb_shadow * __init init_slb_shadow(int cpu)
112{
113 struct slb_shadow *s = &slb_shadow[cpu];
114
115 s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
116 s->buffer_length = cpu_to_be32(sizeof(*s));
117
118 return s;
119}
120
121#else /* CONFIG_PPC_STD_MMU_64 */
122
123static void __init allocate_slb_shadows(int nr_cpus, int limit) { }
124
125#endif /* CONFIG_PPC_STD_MMU_64 */
126
127/* The Paca is an array with one entry per processor. Each contains an
128 * lppaca, which contains the information shared between the
129 * hypervisor and Linux.
130 * On systems with hardware multi-threading, there are two threads
131 * per processor. The Paca array must contain an entry for each thread.
132 * The VPD Areas will give a max logical processors = 2 * max physical
133 * processors. The processor VPD array needs one entry per physical
134 * processor (not thread).
135 */
136struct paca_struct *paca;
137EXPORT_SYMBOL(paca);
138
139void __init initialise_paca(struct paca_struct *new_paca, int cpu)
140{
141 /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
142 * of the TOC can be addressed using a single machine instruction.
143 */
144 unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
145
146#ifdef CONFIG_PPC_BOOK3S
147 new_paca->lppaca_ptr = new_lppaca(cpu);
148#else
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;
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_STD_MMU_64
162 new_paca->slb_shadow_ptr = init_slb_shadow(cpu);
163#endif /* CONFIG_PPC_STD_MMU_64 */
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 (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_size;
193
194void __init allocate_pacas(void)
195{
196 int cpu, limit;
197
198 /*
199 * We can't take SLB misses on the paca, and we want to access them
200 * in real mode, so allocate them within the RMA and also within
201 * the first segment.
202 */
203 limit = min(0x10000000ULL, ppc64_rma_size);
204
205 paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
206
207 paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
208 memset(paca, 0, paca_size);
209
210 printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
211 paca_size, nr_cpu_ids, paca);
212
213 allocate_lppacas(nr_cpu_ids, limit);
214
215 allocate_slb_shadows(nr_cpu_ids, limit);
216
217 /* Can't use for_each_*_cpu, as they aren't functional yet */
218 for (cpu = 0; cpu < nr_cpu_ids; cpu++)
219 initialise_paca(&paca[cpu], cpu);
220}
221
222void __init free_unused_pacas(void)
223{
224 int new_size;
225
226 new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
227
228 if (new_size >= paca_size)
229 return;
230
231 memblock_free(__pa(paca) + new_size, paca_size - new_size);
232
233 printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
234 paca_size - new_size);
235
236 paca_size = new_size;
237
238 free_lppacas();
239}