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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/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}