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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}
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#ifdef CONFIG_PPC_BOOK3S
21
22/*
23 * The structure which the hypervisor knows about - this structure
24 * should not cross a page boundary. The vpa_init/register_vpa call
25 * is now known to fail if the lppaca structure crosses a page
26 * boundary. The lppaca is also used on POWER5 pSeries boxes.
27 * The lppaca is 640 bytes long, and cannot readily
28 * change since the hypervisor knows its layout, so a 1kB alignment
29 * will suffice to ensure that it doesn't cross a page boundary.
30 */
31struct lppaca lppaca[] = {
32 [0 ... (NR_LPPACAS-1)] = {
33 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */
34 .size = cpu_to_be16(sizeof(struct lppaca)),
35 .fpregs_in_use = 1,
36 .slb_count = cpu_to_be16(64),
37 .vmxregs_in_use = 0,
38 .page_ins = 0,
39 },
40};
41
42static struct lppaca *extra_lppacas;
43static long __initdata lppaca_size;
44
45static void __init allocate_lppacas(int nr_cpus, unsigned long limit)
46{
47 if (nr_cpus <= NR_LPPACAS)
48 return;
49
50 lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
51 (nr_cpus - NR_LPPACAS));
52 extra_lppacas = __va(memblock_alloc_base(lppaca_size,
53 PAGE_SIZE, limit));
54}
55
56static struct lppaca * __init new_lppaca(int cpu)
57{
58 struct lppaca *lp;
59
60 if (cpu < NR_LPPACAS)
61 return &lppaca[cpu];
62
63 lp = extra_lppacas + (cpu - NR_LPPACAS);
64 *lp = lppaca[0];
65
66 return lp;
67}
68
69static void __init free_lppacas(void)
70{
71 long new_size = 0, nr;
72
73 if (!lppaca_size)
74 return;
75 nr = num_possible_cpus() - NR_LPPACAS;
76 if (nr > 0)
77 new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
78 if (new_size >= lppaca_size)
79 return;
80
81 memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
82 lppaca_size = new_size;
83}
84
85#else
86
87static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
88static inline void free_lppacas(void) { }
89
90#endif /* CONFIG_PPC_BOOK3S */
91
92#ifdef CONFIG_PPC_STD_MMU_64
93
94/*
95 * 3 persistent SLBs are registered here. The buffer will be zero
96 * initially, hence will all be invaild until we actually write them.
97 *
98 * If you make the number of persistent SLB entries dynamic, please also
99 * update PR KVM to flush and restore them accordingly.
100 */
101static struct slb_shadow *slb_shadow;
102
103static void __init allocate_slb_shadows(int nr_cpus, int limit)
104{
105 int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus);
106 slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit));
107 memset(slb_shadow, 0, size);
108}
109
110static struct slb_shadow * __init init_slb_shadow(int cpu)
111{
112 struct slb_shadow *s = &slb_shadow[cpu];
113
114 /*
115 * When we come through here to initialise boot_paca, the slb_shadow
116 * buffers are not allocated yet. That's OK, we'll get one later in
117 * boot, but make sure we don't corrupt memory at 0.
118 */
119 if (!slb_shadow)
120 return NULL;
121
122 s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
123 s->buffer_length = cpu_to_be32(sizeof(*s));
124
125 return s;
126}
127
128#else /* CONFIG_PPC_STD_MMU_64 */
129
130static void __init allocate_slb_shadows(int nr_cpus, int limit) { }
131
132#endif /* CONFIG_PPC_STD_MMU_64 */
133
134/* The Paca is an array with one entry per processor. Each contains an
135 * lppaca, which contains the information shared between the
136 * hypervisor and Linux.
137 * On systems with hardware multi-threading, there are two threads
138 * per processor. The Paca array must contain an entry for each thread.
139 * The VPD Areas will give a max logical processors = 2 * max physical
140 * processors. The processor VPD array needs one entry per physical
141 * processor (not thread).
142 */
143struct paca_struct *paca;
144EXPORT_SYMBOL(paca);
145
146void __init initialise_paca(struct paca_struct *new_paca, int cpu)
147{
148#ifdef CONFIG_PPC_BOOK3S
149 new_paca->lppaca_ptr = new_lppaca(cpu);
150#else
151 new_paca->kernel_pgd = swapper_pg_dir;
152#endif
153 new_paca->lock_token = 0x8000;
154 new_paca->paca_index = cpu;
155 new_paca->kernel_toc = kernel_toc_addr();
156 new_paca->kernelbase = (unsigned long) _stext;
157 /* Only set MSR:IR/DR when MMU is initialized */
158 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
159 new_paca->hw_cpu_id = 0xffff;
160 new_paca->kexec_state = KEXEC_STATE_NONE;
161 new_paca->__current = &init_task;
162 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
163#ifdef CONFIG_PPC_STD_MMU_64
164 new_paca->slb_shadow_ptr = init_slb_shadow(cpu);
165#endif /* CONFIG_PPC_STD_MMU_64 */
166
167#ifdef CONFIG_PPC_BOOK3E
168 /* For now -- if we have threads this will be adjusted later */
169 new_paca->tcd_ptr = &new_paca->tcd;
170#endif
171}
172
173/* Put the paca pointer into r13 and SPRG_PACA */
174void setup_paca(struct paca_struct *new_paca)
175{
176 /* Setup r13 */
177 local_paca = new_paca;
178
179#ifdef CONFIG_PPC_BOOK3E
180 /* On Book3E, initialize the TLB miss exception frames */
181 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
182#else
183 /* In HV mode, we setup both HPACA and PACA to avoid problems
184 * if we do a GET_PACA() before the feature fixups have been
185 * applied
186 */
187 if (early_cpu_has_feature(CPU_FTR_HVMODE))
188 mtspr(SPRN_SPRG_HPACA, local_paca);
189#endif
190 mtspr(SPRN_SPRG_PACA, local_paca);
191
192}
193
194static int __initdata paca_size;
195
196void __init allocate_pacas(void)
197{
198 u64 limit;
199 int cpu;
200
201 limit = ppc64_rma_size;
202
203#ifdef CONFIG_PPC_BOOK3S_64
204 /*
205 * We can't take SLB misses on the paca, and we want to access them
206 * in real mode, so allocate them within the RMA and also within
207 * the first segment.
208 */
209 limit = min(0x10000000ULL, limit);
210#endif
211
212 paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
213
214 paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
215 memset(paca, 0, paca_size);
216
217 printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
218 paca_size, nr_cpu_ids, paca);
219
220 allocate_lppacas(nr_cpu_ids, limit);
221
222 allocate_slb_shadows(nr_cpu_ids, limit);
223
224 /* Can't use for_each_*_cpu, as they aren't functional yet */
225 for (cpu = 0; cpu < nr_cpu_ids; cpu++)
226 initialise_paca(&paca[cpu], cpu);
227}
228
229void __init free_unused_pacas(void)
230{
231 int new_size;
232
233 new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
234
235 if (new_size >= paca_size)
236 return;
237
238 memblock_free(__pa(paca) + new_size, paca_size - new_size);
239
240 printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
241 paca_size - new_size);
242
243 paca_size = new_size;
244
245 free_lppacas();
246}