Loading...
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/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}