1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * c 2001 PPC 64 Team, IBM Corp
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>
13 #include <asm/lppaca.h>
15 #include <asm/sections.h>
16 #include <asm/kexec.h>
18 #include <asm/ultravisor.h>
27 static void *__init
alloc_paca_data(unsigned long size
, unsigned long align
,
28 unsigned long limit
, int cpu
)
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.
38 if (cpu
== boot_cpuid
) {
40 memblock_set_bottom_up(true);
42 nid
= early_cpu_to_node(cpu
);
45 ptr
= memblock_alloc_try_nid(size
, align
, MEMBLOCK_LOW_LIMIT
,
48 panic("cannot allocate paca data");
50 if (cpu
== boot_cpuid
)
51 memblock_set_bottom_up(false);
56 #ifdef CONFIG_PPC_PSERIES
58 #define LPPACA_SIZE 0x400
60 static void *__init
alloc_shared_lppaca(unsigned long size
, unsigned long limit
,
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
;
69 memblock_set_bottom_up(true);
72 * See Documentation/powerpc/ultravisor.rst for more details.
74 * UV/HV data sharing is in PAGE_SIZE granularity. In order to
75 * minimize the number of pages shared, align the allocation to
79 memblock_alloc_try_nid(shared_lppaca_total_size
,
80 PAGE_SIZE
, MEMBLOCK_LOW_LIMIT
,
83 panic("cannot allocate shared data");
85 memblock_set_bottom_up(false);
86 uv_share_page(PHYS_PFN(__pa(shared_lppaca
)),
87 shared_lppaca_total_size
>> PAGE_SHIFT
);
90 ptr
= shared_lppaca
+ shared_lppaca_size
;
91 shared_lppaca_size
+= size
;
94 * This is very early in boot, so no harm done if the kernel crashes at
97 BUG_ON(shared_lppaca_size
> shared_lppaca_total_size
);
103 * See asm/lppaca.h for more detail.
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.
109 static inline void init_lppaca(struct lppaca
*lppaca
)
111 BUILD_BUG_ON(sizeof(struct lppaca
) != 640);
113 *lppaca
= (struct lppaca
) {
114 .desc
= cpu_to_be32(0xd397d781), /* "LpPa" */
115 .size
= cpu_to_be16(LPPACA_SIZE
),
117 .slb_count
= cpu_to_be16(64),
122 static struct lppaca
* __init
new_lppaca(int cpu
, unsigned long limit
)
126 BUILD_BUG_ON(sizeof(struct lppaca
) > LPPACA_SIZE
);
128 if (early_cpu_has_feature(CPU_FTR_HVMODE
))
131 if (is_secure_guest())
132 lp
= alloc_shared_lppaca(LPPACA_SIZE
, limit
, cpu
);
134 lp
= alloc_paca_data(LPPACA_SIZE
, 0x400, limit
, cpu
);
140 #endif /* CONFIG_PPC_PSERIES */
142 #ifdef CONFIG_PPC_BOOK3S_64
145 * 3 persistent SLBs are allocated here. The buffer will be zero
146 * initially, hence will all be invaild until we actually write them.
148 * If you make the number of persistent SLB entries dynamic, please also
149 * update PR KVM to flush and restore them accordingly.
151 static struct slb_shadow
* __init
new_slb_shadow(int cpu
, unsigned long limit
)
153 struct slb_shadow
*s
;
155 if (cpu
!= boot_cpuid
) {
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.
161 if (early_radix_enabled())
165 s
= alloc_paca_data(sizeof(*s
), L1_CACHE_BYTES
, limit
, cpu
);
167 s
->persistent
= cpu_to_be32(SLB_NUM_BOLTED
);
168 s
->buffer_length
= cpu_to_be32(sizeof(*s
));
173 #endif /* CONFIG_PPC_BOOK3S_64 */
175 #ifdef CONFIG_PPC_PSERIES
177 * new_rtas_args() - Allocates rtas args
179 * @limit: Memory limit for this allocation
181 * Allocates a struct rtas_args and return it's pointer,
182 * if not in Hypervisor mode
184 * Return: Pointer to allocated rtas_args
185 * NULL if CPU in Hypervisor Mode
187 static struct rtas_args
* __init
new_rtas_args(int cpu
, unsigned long limit
)
189 limit
= min_t(unsigned long, limit
, RTAS_INSTANTIATE_MAX
);
191 if (early_cpu_has_feature(CPU_FTR_HVMODE
))
194 return alloc_paca_data(sizeof(struct rtas_args
), L1_CACHE_BYTES
,
197 #endif /* CONFIG_PPC_PSERIES */
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).
208 struct paca_struct
**paca_ptrs __read_mostly
;
209 EXPORT_SYMBOL(paca_ptrs
);
211 void __init
initialise_paca(struct paca_struct
*new_paca
, int cpu
)
213 #ifdef CONFIG_PPC_PSERIES
214 new_paca
->lppaca_ptr
= NULL
;
216 #ifdef CONFIG_PPC_BOOK3E
217 new_paca
->kernel_pgd
= swapper_pg_dir
;
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
;
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
;
238 #ifdef CONFIG_PPC_PSERIES
239 new_paca
->rtas_args_reentrant
= NULL
;
243 /* Put the paca pointer into r13 and SPRG_PACA */
244 void setup_paca(struct paca_struct
*new_paca
)
247 local_paca
= new_paca
;
249 #ifdef CONFIG_PPC_BOOK3E
250 /* On Book3E, initialize the TLB miss exception frames */
251 mtspr(SPRN_SPRG_TLB_EXFRAME
, local_paca
->extlb
);
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
258 * Normally you should test against CPU_FTR_HVMODE, but CPU features
259 * are not yet set up when we first reach here.
261 if (mfmsr() & MSR_HV
)
262 mtspr(SPRN_SPRG_HPACA
, local_paca
);
264 mtspr(SPRN_SPRG_PACA
, local_paca
);
268 static int __initdata paca_nr_cpu_ids
;
269 static int __initdata paca_ptrs_size
;
270 static int __initdata paca_struct_size
;
272 void __init
allocate_paca_ptrs(void)
274 paca_nr_cpu_ids
= nr_cpu_ids
;
276 paca_ptrs_size
= sizeof(struct paca_struct
*) * nr_cpu_ids
;
277 paca_ptrs
= memblock_alloc_raw(paca_ptrs_size
, SMP_CACHE_BYTES
);
279 panic("Failed to allocate %d bytes for paca pointers\n",
282 memset(paca_ptrs
, 0x88, paca_ptrs_size
);
285 void __init
allocate_paca(int cpu
)
288 struct paca_struct
*paca
;
290 BUG_ON(cpu
>= paca_nr_cpu_ids
);
292 #ifdef CONFIG_PPC_BOOK3S_64
294 * We access pacas in real mode, and cannot take SLB faults
295 * on them when in virtual mode, so allocate them accordingly.
297 limit
= min(ppc64_bolted_size(), ppc64_rma_size
);
299 limit
= ppc64_rma_size
;
302 paca
= alloc_paca_data(sizeof(struct paca_struct
), L1_CACHE_BYTES
,
304 paca_ptrs
[cpu
] = paca
;
306 initialise_paca(paca
, cpu
);
307 #ifdef CONFIG_PPC_PSERIES
308 paca
->lppaca_ptr
= new_lppaca(cpu
, limit
);
310 #ifdef CONFIG_PPC_BOOK3S_64
311 paca
->slb_shadow_ptr
= new_slb_shadow(cpu
, limit
);
313 #ifdef CONFIG_PPC_PSERIES
314 paca
->rtas_args_reentrant
= new_rtas_args(cpu
, limit
);
316 paca_struct_size
+= sizeof(struct paca_struct
);
319 void __init
free_unused_pacas(void)
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
);
328 paca_nr_cpu_ids
= nr_cpu_ids
;
329 paca_ptrs_size
= new_ptrs_size
;
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
;
340 printk(KERN_DEBUG
"Allocated %u bytes for %u pacas\n",
341 paca_ptrs_size
+ paca_struct_size
, nr_cpu_ids
);
344 void copy_mm_to_paca(struct mm_struct
*mm
)
346 #ifdef CONFIG_PPC_BOOK3S
347 mm_context_t
*context
= &mm
->context
;
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
),
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
;
361 #else /* !CONFIG_PPC_BOOK3S */