2 * c 2001 PPC 64 Team, IBM Corp
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.
10 #include <linux/smp.h>
11 #include <linux/export.h>
12 #include <linux/memblock.h>
13 #include <linux/sched/task.h>
14 #include <linux/numa.h>
16 #include <asm/lppaca.h>
18 #include <asm/sections.h>
19 #include <asm/pgtable.h>
20 #include <asm/kexec.h>
28 static void *__init
alloc_paca_data(unsigned long size
, unsigned long align
,
29 unsigned long limit
, int cpu
)
35 * boot_cpuid paca is allocated very early before cpu_to_node is up.
36 * Set bottom-up mode, because the boot CPU should be on node-0,
37 * which will put its paca in the right place.
39 if (cpu
== boot_cpuid
) {
41 memblock_set_bottom_up(true);
43 nid
= early_cpu_to_node(cpu
);
46 pa
= memblock_alloc_base_nid(size
, align
, limit
, nid
, MEMBLOCK_NONE
);
48 pa
= memblock_alloc_base(size
, align
, limit
);
50 panic("cannot allocate paca data");
53 if (cpu
== boot_cpuid
)
54 memblock_set_bottom_up(false);
59 #ifdef CONFIG_PPC_PSERIES
62 * See asm/lppaca.h for more detail.
64 * lppaca structures must must be 1kB in size, L1 cache line aligned,
65 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
68 static inline void init_lppaca(struct lppaca
*lppaca
)
70 BUILD_BUG_ON(sizeof(struct lppaca
) != 640);
72 *lppaca
= (struct lppaca
) {
73 .desc
= cpu_to_be32(0xd397d781), /* "LpPa" */
74 .size
= cpu_to_be16(0x400),
76 .slb_count
= cpu_to_be16(64),
81 static struct lppaca
* __init
new_lppaca(int cpu
, unsigned long limit
)
86 BUILD_BUG_ON(size
< sizeof(struct lppaca
));
88 if (early_cpu_has_feature(CPU_FTR_HVMODE
))
91 lp
= alloc_paca_data(size
, 0x400, limit
, cpu
);
96 #endif /* CONFIG_PPC_BOOK3S */
98 #ifdef CONFIG_PPC_BOOK3S_64
101 * 3 persistent SLBs are allocated here. The buffer will be zero
102 * initially, hence will all be invaild until we actually write them.
104 * If you make the number of persistent SLB entries dynamic, please also
105 * update PR KVM to flush and restore them accordingly.
107 static struct slb_shadow
* __init
new_slb_shadow(int cpu
, unsigned long limit
)
109 struct slb_shadow
*s
;
111 if (cpu
!= boot_cpuid
) {
113 * Boot CPU comes here before early_radix_enabled
114 * is parsed (e.g., for disable_radix). So allocate
115 * always and this will be fixed up in free_unused_pacas.
117 if (early_radix_enabled())
121 s
= alloc_paca_data(sizeof(*s
), L1_CACHE_BYTES
, limit
, cpu
);
122 memset(s
, 0, sizeof(*s
));
124 s
->persistent
= cpu_to_be32(SLB_NUM_BOLTED
);
125 s
->buffer_length
= cpu_to_be32(sizeof(*s
));
130 #endif /* CONFIG_PPC_BOOK3S_64 */
132 /* The Paca is an array with one entry per processor. Each contains an
133 * lppaca, which contains the information shared between the
134 * hypervisor and Linux.
135 * On systems with hardware multi-threading, there are two threads
136 * per processor. The Paca array must contain an entry for each thread.
137 * The VPD Areas will give a max logical processors = 2 * max physical
138 * processors. The processor VPD array needs one entry per physical
139 * processor (not thread).
141 struct paca_struct
**paca_ptrs __read_mostly
;
142 EXPORT_SYMBOL(paca_ptrs
);
144 void __init
initialise_paca(struct paca_struct
*new_paca
, int cpu
)
146 #ifdef CONFIG_PPC_PSERIES
147 new_paca
->lppaca_ptr
= NULL
;
149 #ifdef CONFIG_PPC_BOOK3E
150 new_paca
->kernel_pgd
= swapper_pg_dir
;
152 new_paca
->lock_token
= 0x8000;
153 new_paca
->paca_index
= cpu
;
154 new_paca
->kernel_toc
= kernel_toc_addr();
155 new_paca
->kernelbase
= (unsigned long) _stext
;
156 /* Only set MSR:IR/DR when MMU is initialized */
157 new_paca
->kernel_msr
= MSR_KERNEL
& ~(MSR_IR
| MSR_DR
);
158 new_paca
->hw_cpu_id
= 0xffff;
159 new_paca
->kexec_state
= KEXEC_STATE_NONE
;
160 new_paca
->__current
= &init_task
;
161 new_paca
->data_offset
= 0xfeeeeeeeeeeeeeeeULL
;
162 #ifdef CONFIG_PPC_BOOK3S_64
163 new_paca
->slb_shadow_ptr
= NULL
;
166 #ifdef CONFIG_PPC_BOOK3E
167 /* For now -- if we have threads this will be adjusted later */
168 new_paca
->tcd_ptr
= &new_paca
->tcd
;
172 /* Put the paca pointer into r13 and SPRG_PACA */
173 void setup_paca(struct paca_struct
*new_paca
)
176 local_paca
= new_paca
;
178 #ifdef CONFIG_PPC_BOOK3E
179 /* On Book3E, initialize the TLB miss exception frames */
180 mtspr(SPRN_SPRG_TLB_EXFRAME
, local_paca
->extlb
);
182 /* In HV mode, we setup both HPACA and PACA to avoid problems
183 * if we do a GET_PACA() before the feature fixups have been
186 if (early_cpu_has_feature(CPU_FTR_HVMODE
))
187 mtspr(SPRN_SPRG_HPACA
, local_paca
);
189 mtspr(SPRN_SPRG_PACA
, local_paca
);
193 static int __initdata paca_nr_cpu_ids
;
194 static int __initdata paca_ptrs_size
;
195 static int __initdata paca_struct_size
;
197 void __init
allocate_paca_ptrs(void)
199 paca_nr_cpu_ids
= nr_cpu_ids
;
201 paca_ptrs_size
= sizeof(struct paca_struct
*) * nr_cpu_ids
;
202 paca_ptrs
= __va(memblock_phys_alloc(paca_ptrs_size
, SMP_CACHE_BYTES
));
203 memset(paca_ptrs
, 0x88, paca_ptrs_size
);
206 void __init
allocate_paca(int cpu
)
209 struct paca_struct
*paca
;
211 BUG_ON(cpu
>= paca_nr_cpu_ids
);
213 #ifdef CONFIG_PPC_BOOK3S_64
215 * We access pacas in real mode, and cannot take SLB faults
216 * on them when in virtual mode, so allocate them accordingly.
218 limit
= min(ppc64_bolted_size(), ppc64_rma_size
);
220 limit
= ppc64_rma_size
;
223 paca
= alloc_paca_data(sizeof(struct paca_struct
), L1_CACHE_BYTES
,
225 paca_ptrs
[cpu
] = paca
;
226 memset(paca
, 0, sizeof(struct paca_struct
));
228 initialise_paca(paca
, cpu
);
229 #ifdef CONFIG_PPC_PSERIES
230 paca
->lppaca_ptr
= new_lppaca(cpu
, limit
);
232 #ifdef CONFIG_PPC_BOOK3S_64
233 paca
->slb_shadow_ptr
= new_slb_shadow(cpu
, limit
);
235 paca_struct_size
+= sizeof(struct paca_struct
);
238 void __init
free_unused_pacas(void)
242 new_ptrs_size
= sizeof(struct paca_struct
*) * nr_cpu_ids
;
243 if (new_ptrs_size
< paca_ptrs_size
)
244 memblock_free(__pa(paca_ptrs
) + new_ptrs_size
,
245 paca_ptrs_size
- new_ptrs_size
);
247 paca_nr_cpu_ids
= nr_cpu_ids
;
248 paca_ptrs_size
= new_ptrs_size
;
250 #ifdef CONFIG_PPC_BOOK3S_64
251 if (early_radix_enabled()) {
252 /* Ugly fixup, see new_slb_shadow() */
253 memblock_free(__pa(paca_ptrs
[boot_cpuid
]->slb_shadow_ptr
),
254 sizeof(struct slb_shadow
));
255 paca_ptrs
[boot_cpuid
]->slb_shadow_ptr
= NULL
;
259 printk(KERN_DEBUG
"Allocated %u bytes for %u pacas\n",
260 paca_ptrs_size
+ paca_struct_size
, nr_cpu_ids
);
263 void copy_mm_to_paca(struct mm_struct
*mm
)
265 #ifdef CONFIG_PPC_BOOK3S
266 mm_context_t
*context
= &mm
->context
;
268 get_paca()->mm_ctx_id
= context
->id
;
269 #ifdef CONFIG_PPC_MM_SLICES
270 VM_BUG_ON(!mm
->context
.slb_addr_limit
);
271 get_paca()->mm_ctx_slb_addr_limit
= mm
->context
.slb_addr_limit
;
272 memcpy(&get_paca()->mm_ctx_low_slices_psize
,
273 &context
->low_slices_psize
, sizeof(context
->low_slices_psize
));
274 memcpy(&get_paca()->mm_ctx_high_slices_psize
,
275 &context
->high_slices_psize
, TASK_SLICE_ARRAY_SZ(mm
));
276 #else /* CONFIG_PPC_MM_SLICES */
277 get_paca()->mm_ctx_user_psize
= context
->user_psize
;
278 get_paca()->mm_ctx_sllp
= context
->sllp
;
280 #else /* !CONFIG_PPC_BOOK3S */