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>
12 #include <asm/lppaca.h>
14 #include <asm/sections.h>
15 #include <asm/pgtable.h>
16 #include <asm/kexec.h>
18 #include <asm/ultravisor.h>
26 static void *__init alloc_paca_data(unsigned long size, unsigned long align,
27 unsigned long limit, int cpu)
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.
37 if (cpu == boot_cpuid) {
39 memblock_set_bottom_up(true);
41 nid = early_cpu_to_node(cpu);
44 ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
47 panic("cannot allocate paca data");
49 if (cpu == boot_cpuid)
50 memblock_set_bottom_up(false);
55 #ifdef CONFIG_PPC_PSERIES
57 #define LPPACA_SIZE 0x400
59 static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align,
60 unsigned long limit, int cpu)
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;
68 memblock_set_bottom_up(true);
71 memblock_alloc_try_nid(shared_lppaca_total_size,
72 PAGE_SIZE, MEMBLOCK_LOW_LIMIT,
75 panic("cannot allocate shared data");
77 memblock_set_bottom_up(false);
78 uv_share_page(PHYS_PFN(__pa(shared_lppaca)),
79 shared_lppaca_total_size >> PAGE_SHIFT);
82 ptr = shared_lppaca + shared_lppaca_size;
83 shared_lppaca_size += size;
86 * This is very early in boot, so no harm done if the kernel crashes at
89 BUG_ON(shared_lppaca_size > shared_lppaca_total_size);
95 * See asm/lppaca.h for more detail.
97 * lppaca structures must must be 1kB in size, L1 cache line aligned,
98 * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
101 static inline void init_lppaca(struct lppaca *lppaca)
103 BUILD_BUG_ON(sizeof(struct lppaca) != 640);
105 *lppaca = (struct lppaca) {
106 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */
107 .size = cpu_to_be16(LPPACA_SIZE),
109 .slb_count = cpu_to_be16(64),
114 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
118 BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE);
120 if (early_cpu_has_feature(CPU_FTR_HVMODE))
123 if (is_secure_guest())
124 lp = alloc_shared_lppaca(LPPACA_SIZE, 0x400, limit, cpu);
126 lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);
132 #endif /* CONFIG_PPC_PSERIES */
134 #ifdef CONFIG_PPC_BOOK3S_64
137 * 3 persistent SLBs are allocated here. The buffer will be zero
138 * initially, hence will all be invaild until we actually write them.
140 * If you make the number of persistent SLB entries dynamic, please also
141 * update PR KVM to flush and restore them accordingly.
143 static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
145 struct slb_shadow *s;
147 if (cpu != boot_cpuid) {
149 * Boot CPU comes here before early_radix_enabled
150 * is parsed (e.g., for disable_radix). So allocate
151 * always and this will be fixed up in free_unused_pacas.
153 if (early_radix_enabled())
157 s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu);
159 s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
160 s->buffer_length = cpu_to_be32(sizeof(*s));
165 #endif /* CONFIG_PPC_BOOK3S_64 */
167 /* The Paca is an array with one entry per processor. Each contains an
168 * lppaca, which contains the information shared between the
169 * hypervisor and Linux.
170 * On systems with hardware multi-threading, there are two threads
171 * per processor. The Paca array must contain an entry for each thread.
172 * The VPD Areas will give a max logical processors = 2 * max physical
173 * processors. The processor VPD array needs one entry per physical
174 * processor (not thread).
176 struct paca_struct **paca_ptrs __read_mostly;
177 EXPORT_SYMBOL(paca_ptrs);
179 void __init initialise_paca(struct paca_struct *new_paca, int cpu)
181 #ifdef CONFIG_PPC_PSERIES
182 new_paca->lppaca_ptr = NULL;
184 #ifdef CONFIG_PPC_BOOK3E
185 new_paca->kernel_pgd = swapper_pg_dir;
187 new_paca->lock_token = 0x8000;
188 new_paca->paca_index = cpu;
189 new_paca->kernel_toc = kernel_toc_addr();
190 new_paca->kernelbase = (unsigned long) _stext;
191 /* Only set MSR:IR/DR when MMU is initialized */
192 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
193 new_paca->hw_cpu_id = 0xffff;
194 new_paca->kexec_state = KEXEC_STATE_NONE;
195 new_paca->__current = &init_task;
196 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
197 #ifdef CONFIG_PPC_BOOK3S_64
198 new_paca->slb_shadow_ptr = NULL;
201 #ifdef CONFIG_PPC_BOOK3E
202 /* For now -- if we have threads this will be adjusted later */
203 new_paca->tcd_ptr = &new_paca->tcd;
207 /* Put the paca pointer into r13 and SPRG_PACA */
208 void setup_paca(struct paca_struct *new_paca)
211 local_paca = new_paca;
213 #ifdef CONFIG_PPC_BOOK3E
214 /* On Book3E, initialize the TLB miss exception frames */
215 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
218 * In HV mode, we setup both HPACA and PACA to avoid problems
219 * if we do a GET_PACA() before the feature fixups have been
222 * Normally you should test against CPU_FTR_HVMODE, but CPU features
223 * are not yet set up when we first reach here.
225 if (mfmsr() & MSR_HV)
226 mtspr(SPRN_SPRG_HPACA, local_paca);
228 mtspr(SPRN_SPRG_PACA, local_paca);
232 static int __initdata paca_nr_cpu_ids;
233 static int __initdata paca_ptrs_size;
234 static int __initdata paca_struct_size;
236 void __init allocate_paca_ptrs(void)
238 paca_nr_cpu_ids = nr_cpu_ids;
240 paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
241 paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES);
243 panic("Failed to allocate %d bytes for paca pointers\n",
246 memset(paca_ptrs, 0x88, paca_ptrs_size);
249 void __init allocate_paca(int cpu)
252 struct paca_struct *paca;
254 BUG_ON(cpu >= paca_nr_cpu_ids);
256 #ifdef CONFIG_PPC_BOOK3S_64
258 * We access pacas in real mode, and cannot take SLB faults
259 * on them when in virtual mode, so allocate them accordingly.
261 limit = min(ppc64_bolted_size(), ppc64_rma_size);
263 limit = ppc64_rma_size;
266 paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
268 paca_ptrs[cpu] = paca;
270 initialise_paca(paca, cpu);
271 #ifdef CONFIG_PPC_PSERIES
272 paca->lppaca_ptr = new_lppaca(cpu, limit);
274 #ifdef CONFIG_PPC_BOOK3S_64
275 paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
277 paca_struct_size += sizeof(struct paca_struct);
280 void __init free_unused_pacas(void)
284 new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
285 if (new_ptrs_size < paca_ptrs_size)
286 memblock_free(__pa(paca_ptrs) + new_ptrs_size,
287 paca_ptrs_size - new_ptrs_size);
289 paca_nr_cpu_ids = nr_cpu_ids;
290 paca_ptrs_size = new_ptrs_size;
292 #ifdef CONFIG_PPC_BOOK3S_64
293 if (early_radix_enabled()) {
294 /* Ugly fixup, see new_slb_shadow() */
295 memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
296 sizeof(struct slb_shadow));
297 paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
301 printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
302 paca_ptrs_size + paca_struct_size, nr_cpu_ids);
305 void copy_mm_to_paca(struct mm_struct *mm)
307 #ifdef CONFIG_PPC_BOOK3S
308 mm_context_t *context = &mm->context;
310 get_paca()->mm_ctx_id = context->id;
311 #ifdef CONFIG_PPC_MM_SLICES
312 VM_BUG_ON(!mm_ctx_slb_addr_limit(context));
313 get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context);
314 memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context),
316 memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context),
317 TASK_SLICE_ARRAY_SZ(context));
318 #else /* CONFIG_PPC_MM_SLICES */
319 get_paca()->mm_ctx_user_psize = context->user_psize;
320 get_paca()->mm_ctx_sllp = context->sllp;
322 #else /* !CONFIG_PPC_BOOK3S */