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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#include <asm/rtas.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 void *ptr;
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 = NUMA_NO_NODE;
40 memblock_set_bottom_up(true);
41 } else {
42 nid = early_cpu_to_node(cpu);
43 }
44
45 ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
46 limit, nid);
47 if (!ptr)
48 panic("cannot allocate paca data");
49
50 if (cpu == boot_cpuid)
51 memblock_set_bottom_up(false);
52
53 return ptr;
54}
55
56#ifdef CONFIG_PPC_PSERIES
57
58#define LPPACA_SIZE 0x400
59
60static void *__init alloc_shared_lppaca(unsigned long size, unsigned long limit,
61 int cpu)
62{
63 size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE);
64 static unsigned long shared_lppaca_size;
65 static void *shared_lppaca;
66 void *ptr;
67
68 if (!shared_lppaca) {
69 memblock_set_bottom_up(true);
70
71 /*
72 * See Documentation/powerpc/ultravisor.rst for more details.
73 *
74 * UV/HV data sharing is in PAGE_SIZE granularity. In order to
75 * minimize the number of pages shared, align the allocation to
76 * PAGE_SIZE.
77 */
78 shared_lppaca =
79 memblock_alloc_try_nid(shared_lppaca_total_size,
80 PAGE_SIZE, MEMBLOCK_LOW_LIMIT,
81 limit, NUMA_NO_NODE);
82 if (!shared_lppaca)
83 panic("cannot allocate shared data");
84
85 memblock_set_bottom_up(false);
86 uv_share_page(PHYS_PFN(__pa(shared_lppaca)),
87 shared_lppaca_total_size >> PAGE_SHIFT);
88 }
89
90 ptr = shared_lppaca + shared_lppaca_size;
91 shared_lppaca_size += size;
92
93 /*
94 * This is very early in boot, so no harm done if the kernel crashes at
95 * this point.
96 */
97 BUG_ON(shared_lppaca_size > shared_lppaca_total_size);
98
99 return ptr;
100}
101
102/*
103 * See asm/lppaca.h for more detail.
104 *
105 * lppaca structures must must be 1kB in size, L1 cache line aligned,
106 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
107 * these requirements.
108 */
109static inline void init_lppaca(struct lppaca *lppaca)
110{
111 BUILD_BUG_ON(sizeof(struct lppaca) != 640);
112
113 *lppaca = (struct lppaca) {
114 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */
115 .size = cpu_to_be16(LPPACA_SIZE),
116 .fpregs_in_use = 1,
117 .slb_count = cpu_to_be16(64),
118 .vmxregs_in_use = 0,
119 .page_ins = 0, };
120};
121
122static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
123{
124 struct lppaca *lp;
125
126 BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE);
127
128 if (early_cpu_has_feature(CPU_FTR_HVMODE))
129 return NULL;
130
131 if (is_secure_guest())
132 lp = alloc_shared_lppaca(LPPACA_SIZE, limit, cpu);
133 else
134 lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);
135
136 init_lppaca(lp);
137
138 return lp;
139}
140#endif /* CONFIG_PPC_PSERIES */
141
142#ifdef CONFIG_PPC_BOOK3S_64
143
144/*
145 * 3 persistent SLBs are allocated here. The buffer will be zero
146 * initially, hence will all be invaild until we actually write them.
147 *
148 * If you make the number of persistent SLB entries dynamic, please also
149 * update PR KVM to flush and restore them accordingly.
150 */
151static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
152{
153 struct slb_shadow *s;
154
155 if (cpu != boot_cpuid) {
156 /*
157 * Boot CPU comes here before early_radix_enabled
158 * is parsed (e.g., for disable_radix). So allocate
159 * always and this will be fixed up in free_unused_pacas.
160 */
161 if (early_radix_enabled())
162 return NULL;
163 }
164
165 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu);
166
167 s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
168 s->buffer_length = cpu_to_be32(sizeof(*s));
169
170 return s;
171}
172
173#endif /* CONFIG_PPC_BOOK3S_64 */
174
175#ifdef CONFIG_PPC_PSERIES
176/**
177 * new_rtas_args() - Allocates rtas args
178 * @cpu: CPU number
179 * @limit: Memory limit for this allocation
180 *
181 * Allocates a struct rtas_args and return it's pointer,
182 * if not in Hypervisor mode
183 *
184 * Return: Pointer to allocated rtas_args
185 * NULL if CPU in Hypervisor Mode
186 */
187static struct rtas_args * __init new_rtas_args(int cpu, unsigned long limit)
188{
189 limit = min_t(unsigned long, limit, RTAS_INSTANTIATE_MAX);
190
191 if (early_cpu_has_feature(CPU_FTR_HVMODE))
192 return NULL;
193
194 return alloc_paca_data(sizeof(struct rtas_args), L1_CACHE_BYTES,
195 limit, cpu);
196}
197#endif /* CONFIG_PPC_PSERIES */
198
199/* The Paca is an array with one entry per processor. Each contains an
200 * lppaca, which contains the information shared between the
201 * hypervisor and Linux.
202 * On systems with hardware multi-threading, there are two threads
203 * per processor. The Paca array must contain an entry for each thread.
204 * The VPD Areas will give a max logical processors = 2 * max physical
205 * processors. The processor VPD array needs one entry per physical
206 * processor (not thread).
207 */
208struct paca_struct **paca_ptrs __read_mostly;
209EXPORT_SYMBOL(paca_ptrs);
210
211void __init __nostackprotector initialise_paca(struct paca_struct *new_paca, int cpu)
212{
213#ifdef CONFIG_PPC_PSERIES
214 new_paca->lppaca_ptr = NULL;
215#endif
216#ifdef CONFIG_PPC_BOOK3E
217 new_paca->kernel_pgd = swapper_pg_dir;
218#endif
219 new_paca->lock_token = 0x8000;
220 new_paca->paca_index = cpu;
221 new_paca->kernel_toc = kernel_toc_addr();
222 new_paca->kernelbase = (unsigned long) _stext;
223 /* Only set MSR:IR/DR when MMU is initialized */
224 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
225 new_paca->hw_cpu_id = 0xffff;
226 new_paca->kexec_state = KEXEC_STATE_NONE;
227 new_paca->__current = &init_task;
228 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
229#ifdef CONFIG_PPC_BOOK3S_64
230 new_paca->slb_shadow_ptr = NULL;
231#endif
232
233#ifdef CONFIG_PPC_BOOK3E
234 /* For now -- if we have threads this will be adjusted later */
235 new_paca->tcd_ptr = &new_paca->tcd;
236#endif
237
238#ifdef CONFIG_PPC_PSERIES
239 new_paca->rtas_args_reentrant = NULL;
240#endif
241}
242
243/* Put the paca pointer into r13 and SPRG_PACA */
244void __nostackprotector setup_paca(struct paca_struct *new_paca)
245{
246 /* Setup r13 */
247 local_paca = new_paca;
248
249#ifdef CONFIG_PPC_BOOK3E
250 /* On Book3E, initialize the TLB miss exception frames */
251 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
252#else
253 /*
254 * In HV mode, we setup both HPACA and PACA to avoid problems
255 * if we do a GET_PACA() before the feature fixups have been
256 * applied.
257 *
258 * Normally you should test against CPU_FTR_HVMODE, but CPU features
259 * are not yet set up when we first reach here.
260 */
261 if (mfmsr() & MSR_HV)
262 mtspr(SPRN_SPRG_HPACA, local_paca);
263#endif
264 mtspr(SPRN_SPRG_PACA, local_paca);
265
266}
267
268static int __initdata paca_nr_cpu_ids;
269static int __initdata paca_ptrs_size;
270static int __initdata paca_struct_size;
271
272void __init allocate_paca_ptrs(void)
273{
274 paca_nr_cpu_ids = nr_cpu_ids;
275
276 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
277 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES);
278 if (!paca_ptrs)
279 panic("Failed to allocate %d bytes for paca pointers\n",
280 paca_ptrs_size);
281
282 memset(paca_ptrs, 0x88, paca_ptrs_size);
283}
284
285void __init allocate_paca(int cpu)
286{
287 u64 limit;
288 struct paca_struct *paca;
289
290 BUG_ON(cpu >= paca_nr_cpu_ids);
291
292#ifdef CONFIG_PPC_BOOK3S_64
293 /*
294 * We access pacas in real mode, and cannot take SLB faults
295 * on them when in virtual mode, so allocate them accordingly.
296 */
297 limit = min(ppc64_bolted_size(), ppc64_rma_size);
298#else
299 limit = ppc64_rma_size;
300#endif
301
302 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
303 limit, cpu);
304 paca_ptrs[cpu] = paca;
305
306 initialise_paca(paca, cpu);
307#ifdef CONFIG_PPC_PSERIES
308 paca->lppaca_ptr = new_lppaca(cpu, limit);
309#endif
310#ifdef CONFIG_PPC_BOOK3S_64
311 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
312#endif
313#ifdef CONFIG_PPC_PSERIES
314 paca->rtas_args_reentrant = new_rtas_args(cpu, limit);
315#endif
316 paca_struct_size += sizeof(struct paca_struct);
317}
318
319void __init free_unused_pacas(void)
320{
321 int new_ptrs_size;
322
323 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
324 if (new_ptrs_size < paca_ptrs_size)
325 memblock_free(__pa(paca_ptrs) + new_ptrs_size,
326 paca_ptrs_size - new_ptrs_size);
327
328 paca_nr_cpu_ids = nr_cpu_ids;
329 paca_ptrs_size = new_ptrs_size;
330
331#ifdef CONFIG_PPC_BOOK3S_64
332 if (early_radix_enabled()) {
333 /* Ugly fixup, see new_slb_shadow() */
334 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
335 sizeof(struct slb_shadow));
336 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
337 }
338#endif
339
340 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
341 paca_ptrs_size + paca_struct_size, nr_cpu_ids);
342}
343
344void copy_mm_to_paca(struct mm_struct *mm)
345{
346#ifdef CONFIG_PPC_BOOK3S
347 mm_context_t *context = &mm->context;
348
349 get_paca()->mm_ctx_id = context->id;
350#ifdef CONFIG_PPC_MM_SLICES
351 VM_BUG_ON(!mm_ctx_slb_addr_limit(context));
352 get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context);
353 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context),
354 LOW_SLICE_ARRAY_SZ);
355 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context),
356 TASK_SLICE_ARRAY_SZ(context));
357#else /* CONFIG_PPC_MM_SLICES */
358 get_paca()->mm_ctx_user_psize = context->user_psize;
359 get_paca()->mm_ctx_sllp = context->sllp;
360#endif
361#else /* !CONFIG_PPC_BOOK3S */
362 return;
363#endif
364}
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/module.h>
12#include <linux/memblock.h>
13
14#include <asm/firmware.h>
15#include <asm/lppaca.h>
16#include <asm/paca.h>
17#include <asm/sections.h>
18#include <asm/pgtable.h>
19#include <asm/iseries/lpar_map.h>
20#include <asm/iseries/hv_types.h>
21#include <asm/kexec.h>
22
23/* This symbol is provided by the linker - let it fill in the paca
24 * field correctly */
25extern unsigned long __toc_start;
26
27#ifdef CONFIG_PPC_BOOK3S
28
29/*
30 * The structure which the hypervisor knows about - this structure
31 * should not cross a page boundary. The vpa_init/register_vpa call
32 * is now known to fail if the lppaca structure crosses a page
33 * boundary. The lppaca is also used on legacy iSeries and POWER5
34 * pSeries boxes. The lppaca is 640 bytes long, and cannot readily
35 * change since the hypervisor knows its layout, so a 1kB alignment
36 * will suffice to ensure that it doesn't cross a page boundary.
37 */
38struct lppaca lppaca[] = {
39 [0 ... (NR_LPPACAS-1)] = {
40 .desc = 0xd397d781, /* "LpPa" */
41 .size = sizeof(struct lppaca),
42 .dyn_proc_status = 2,
43 .decr_val = 0x00ff0000,
44 .fpregs_in_use = 1,
45 .end_of_quantum = 0xfffffffffffffffful,
46 .slb_count = 64,
47 .vmxregs_in_use = 0,
48 .page_ins = 0,
49 },
50};
51
52static struct lppaca *extra_lppacas;
53static long __initdata lppaca_size;
54
55static void allocate_lppacas(int nr_cpus, unsigned long limit)
56{
57 if (nr_cpus <= NR_LPPACAS)
58 return;
59
60 lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
61 (nr_cpus - NR_LPPACAS));
62 extra_lppacas = __va(memblock_alloc_base(lppaca_size,
63 PAGE_SIZE, limit));
64}
65
66static struct lppaca *new_lppaca(int cpu)
67{
68 struct lppaca *lp;
69
70 if (cpu < NR_LPPACAS)
71 return &lppaca[cpu];
72
73 lp = extra_lppacas + (cpu - NR_LPPACAS);
74 *lp = lppaca[0];
75
76 return lp;
77}
78
79static void free_lppacas(void)
80{
81 long new_size = 0, nr;
82
83 if (!lppaca_size)
84 return;
85 nr = num_possible_cpus() - NR_LPPACAS;
86 if (nr > 0)
87 new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
88 if (new_size >= lppaca_size)
89 return;
90
91 memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
92 lppaca_size = new_size;
93}
94
95#else
96
97static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
98static inline void free_lppacas(void) { }
99
100#endif /* CONFIG_PPC_BOOK3S */
101
102#ifdef CONFIG_PPC_STD_MMU_64
103
104/*
105 * 3 persistent SLBs are registered here. The buffer will be zero
106 * initially, hence will all be invaild until we actually write them.
107 */
108struct slb_shadow slb_shadow[] __cacheline_aligned = {
109 [0 ... (NR_CPUS-1)] = {
110 .persistent = SLB_NUM_BOLTED,
111 .buffer_length = sizeof(struct slb_shadow),
112 },
113};
114
115#endif /* CONFIG_PPC_STD_MMU_64 */
116
117/* The Paca is an array with one entry per processor. Each contains an
118 * lppaca, which contains the information shared between the
119 * hypervisor and Linux.
120 * On systems with hardware multi-threading, there are two threads
121 * per processor. The Paca array must contain an entry for each thread.
122 * The VPD Areas will give a max logical processors = 2 * max physical
123 * processors. The processor VPD array needs one entry per physical
124 * processor (not thread).
125 */
126struct paca_struct *paca;
127EXPORT_SYMBOL(paca);
128
129struct paca_struct boot_paca;
130
131void __init initialise_paca(struct paca_struct *new_paca, int cpu)
132{
133 /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
134 * of the TOC can be addressed using a single machine instruction.
135 */
136 unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
137
138#ifdef CONFIG_PPC_BOOK3S
139 new_paca->lppaca_ptr = new_lppaca(cpu);
140#else
141 new_paca->kernel_pgd = swapper_pg_dir;
142#endif
143 new_paca->lock_token = 0x8000;
144 new_paca->paca_index = cpu;
145 new_paca->kernel_toc = kernel_toc;
146 new_paca->kernelbase = (unsigned long) _stext;
147 new_paca->kernel_msr = MSR_KERNEL;
148 new_paca->hw_cpu_id = 0xffff;
149 new_paca->kexec_state = KEXEC_STATE_NONE;
150 new_paca->__current = &init_task;
151#ifdef CONFIG_PPC_STD_MMU_64
152 new_paca->slb_shadow_ptr = &slb_shadow[cpu];
153#endif /* CONFIG_PPC_STD_MMU_64 */
154}
155
156/* Put the paca pointer into r13 and SPRG_PACA */
157void setup_paca(struct paca_struct *new_paca)
158{
159 /* Setup r13 */
160 local_paca = new_paca;
161
162#ifdef CONFIG_PPC_BOOK3E
163 /* On Book3E, initialize the TLB miss exception frames */
164 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
165#else
166 /* In HV mode, we setup both HPACA and PACA to avoid problems
167 * if we do a GET_PACA() before the feature fixups have been
168 * applied
169 */
170 if (cpu_has_feature(CPU_FTR_HVMODE))
171 mtspr(SPRN_SPRG_HPACA, local_paca);
172#endif
173 mtspr(SPRN_SPRG_PACA, local_paca);
174
175}
176
177static int __initdata paca_size;
178
179void __init allocate_pacas(void)
180{
181 int cpu, limit;
182
183 /*
184 * We can't take SLB misses on the paca, and we want to access them
185 * in real mode, so allocate them within the RMA and also within
186 * the first segment. On iSeries they must be within the area mapped
187 * by the HV, which is HvPagesToMap * HVPAGESIZE bytes.
188 */
189 limit = min(0x10000000ULL, ppc64_rma_size);
190 if (firmware_has_feature(FW_FEATURE_ISERIES))
191 limit = min(limit, HvPagesToMap * HVPAGESIZE);
192
193 paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
194
195 paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
196 memset(paca, 0, paca_size);
197
198 printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
199 paca_size, nr_cpu_ids, paca);
200
201 allocate_lppacas(nr_cpu_ids, limit);
202
203 /* Can't use for_each_*_cpu, as they aren't functional yet */
204 for (cpu = 0; cpu < nr_cpu_ids; cpu++)
205 initialise_paca(&paca[cpu], cpu);
206}
207
208void __init free_unused_pacas(void)
209{
210 int new_size;
211
212 new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
213
214 if (new_size >= paca_size)
215 return;
216
217 memblock_free(__pa(paca) + new_size, paca_size - new_size);
218
219 printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
220 paca_size - new_size);
221
222 paca_size = new_size;
223
224 free_lppacas();
225}