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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * c 2001 PPC 64 Team, IBM Corp
- */
- #include <linux/smp.h>
- #include <linux/export.h>
- #include <linux/memblock.h>
- #include <linux/sched/task.h>
- #include <linux/numa.h>
- #include <linux/pgtable.h>
- #include <asm/lppaca.h>
- #include <asm/paca.h>
- #include <asm/sections.h>
- #include <asm/kexec.h>
- #include <asm/svm.h>
- #include <asm/ultravisor.h>
- #include "setup.h"
- #ifndef CONFIG_SMP
- #define boot_cpuid 0
- #endif
- static void *__init alloc_paca_data(unsigned long size, unsigned long align,
- unsigned long limit, int cpu)
- {
- void *ptr;
- int nid;
- /*
- * boot_cpuid paca is allocated very early before cpu_to_node is up.
- * Set bottom-up mode, because the boot CPU should be on node-0,
- * which will put its paca in the right place.
- */
- if (cpu == boot_cpuid) {
- nid = NUMA_NO_NODE;
- memblock_set_bottom_up(true);
- } else {
- nid = early_cpu_to_node(cpu);
- }
- ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
- limit, nid);
- if (!ptr)
- panic("cannot allocate paca data");
- if (cpu == boot_cpuid)
- memblock_set_bottom_up(false);
- return ptr;
- }
- #ifdef CONFIG_PPC_PSERIES
- #define LPPACA_SIZE 0x400
- static void *__init alloc_shared_lppaca(unsigned long size, unsigned long limit,
- int cpu)
- {
- size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE);
- static unsigned long shared_lppaca_size;
- static void *shared_lppaca;
- void *ptr;
- if (!shared_lppaca) {
- memblock_set_bottom_up(true);
- /*
- * See Documentation/powerpc/ultravisor.rst for more details.
- *
- * UV/HV data sharing is in PAGE_SIZE granularity. In order to
- * minimize the number of pages shared, align the allocation to
- * PAGE_SIZE.
- */
- shared_lppaca =
- memblock_alloc_try_nid(shared_lppaca_total_size,
- PAGE_SIZE, MEMBLOCK_LOW_LIMIT,
- limit, NUMA_NO_NODE);
- if (!shared_lppaca)
- panic("cannot allocate shared data");
- memblock_set_bottom_up(false);
- uv_share_page(PHYS_PFN(__pa(shared_lppaca)),
- shared_lppaca_total_size >> PAGE_SHIFT);
- }
- ptr = shared_lppaca + shared_lppaca_size;
- shared_lppaca_size += size;
- /*
- * This is very early in boot, so no harm done if the kernel crashes at
- * this point.
- */
- BUG_ON(shared_lppaca_size > shared_lppaca_total_size);
- return ptr;
- }
- /*
- * See asm/lppaca.h for more detail.
- *
- * lppaca structures must must be 1kB in size, L1 cache line aligned,
- * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
- * these requirements.
- */
- static inline void init_lppaca(struct lppaca *lppaca)
- {
- BUILD_BUG_ON(sizeof(struct lppaca) != 640);
- *lppaca = (struct lppaca) {
- .desc = cpu_to_be32(0xd397d781), /* "LpPa" */
- .size = cpu_to_be16(LPPACA_SIZE),
- .fpregs_in_use = 1,
- .slb_count = cpu_to_be16(64),
- .vmxregs_in_use = 0,
- .page_ins = 0, };
- };
- static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
- {
- struct lppaca *lp;
- BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE);
- if (early_cpu_has_feature(CPU_FTR_HVMODE))
- return NULL;
- if (is_secure_guest())
- lp = alloc_shared_lppaca(LPPACA_SIZE, limit, cpu);
- else
- lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);
- init_lppaca(lp);
- return lp;
- }
- #endif /* CONFIG_PPC_PSERIES */
- #ifdef CONFIG_PPC_64S_HASH_MMU
- /*
- * 3 persistent SLBs are allocated here. The buffer will be zero
- * initially, hence will all be invaild until we actually write them.
- *
- * If you make the number of persistent SLB entries dynamic, please also
- * update PR KVM to flush and restore them accordingly.
- */
- static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
- {
- struct slb_shadow *s;
- if (cpu != boot_cpuid) {
- /*
- * Boot CPU comes here before early_radix_enabled
- * is parsed (e.g., for disable_radix). So allocate
- * always and this will be fixed up in free_unused_pacas.
- */
- if (early_radix_enabled())
- return NULL;
- }
- s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu);
- s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
- s->buffer_length = cpu_to_be32(sizeof(*s));
- return s;
- }
- #endif /* CONFIG_PPC_64S_HASH_MMU */
- /* The Paca is an array with one entry per processor. Each contains an
- * lppaca, which contains the information shared between the
- * hypervisor and Linux.
- * On systems with hardware multi-threading, there are two threads
- * per processor. The Paca array must contain an entry for each thread.
- * The VPD Areas will give a max logical processors = 2 * max physical
- * processors. The processor VPD array needs one entry per physical
- * processor (not thread).
- */
- struct paca_struct **paca_ptrs __read_mostly;
- EXPORT_SYMBOL(paca_ptrs);
- void __init initialise_paca(struct paca_struct *new_paca, int cpu)
- {
- #ifdef CONFIG_PPC_PSERIES
- new_paca->lppaca_ptr = NULL;
- #endif
- #ifdef CONFIG_PPC_BOOK3E_64
- new_paca->kernel_pgd = swapper_pg_dir;
- #endif
- new_paca->lock_token = 0x8000;
- new_paca->paca_index = cpu;
- new_paca->kernel_toc = kernel_toc_addr();
- new_paca->kernelbase = (unsigned long) _stext;
- /* Only set MSR:IR/DR when MMU is initialized */
- new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
- new_paca->hw_cpu_id = 0xffff;
- new_paca->kexec_state = KEXEC_STATE_NONE;
- new_paca->__current = &init_task;
- new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
- #ifdef CONFIG_PPC_64S_HASH_MMU
- new_paca->slb_shadow_ptr = NULL;
- #endif
- #ifdef CONFIG_PPC_BOOK3E_64
- /* For now -- if we have threads this will be adjusted later */
- new_paca->tcd_ptr = &new_paca->tcd;
- #endif
- }
- /* Put the paca pointer into r13 and SPRG_PACA */
- void setup_paca(struct paca_struct *new_paca)
- {
- /* Setup r13 */
- local_paca = new_paca;
- #ifdef CONFIG_PPC_BOOK3E_64
- /* On Book3E, initialize the TLB miss exception frames */
- mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
- #else
- /*
- * In HV mode, we setup both HPACA and PACA to avoid problems
- * if we do a GET_PACA() before the feature fixups have been
- * applied.
- *
- * Normally you should test against CPU_FTR_HVMODE, but CPU features
- * are not yet set up when we first reach here.
- */
- if (mfmsr() & MSR_HV)
- mtspr(SPRN_SPRG_HPACA, local_paca);
- #endif
- mtspr(SPRN_SPRG_PACA, local_paca);
- }
- static int __initdata paca_nr_cpu_ids;
- static int __initdata paca_ptrs_size;
- static int __initdata paca_struct_size;
- void __init allocate_paca_ptrs(void)
- {
- paca_nr_cpu_ids = nr_cpu_ids;
- paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
- paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES);
- if (!paca_ptrs)
- panic("Failed to allocate %d bytes for paca pointers\n",
- paca_ptrs_size);
- memset(paca_ptrs, 0x88, paca_ptrs_size);
- }
- void __init allocate_paca(int cpu)
- {
- u64 limit;
- struct paca_struct *paca;
- BUG_ON(cpu >= paca_nr_cpu_ids);
- #ifdef CONFIG_PPC_BOOK3S_64
- /*
- * We access pacas in real mode, and cannot take SLB faults
- * on them when in virtual mode, so allocate them accordingly.
- */
- limit = min(ppc64_bolted_size(), ppc64_rma_size);
- #else
- limit = ppc64_rma_size;
- #endif
- paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
- limit, cpu);
- paca_ptrs[cpu] = paca;
- initialise_paca(paca, cpu);
- #ifdef CONFIG_PPC_PSERIES
- paca->lppaca_ptr = new_lppaca(cpu, limit);
- #endif
- #ifdef CONFIG_PPC_64S_HASH_MMU
- paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
- #endif
- paca_struct_size += sizeof(struct paca_struct);
- }
- void __init free_unused_pacas(void)
- {
- int new_ptrs_size;
- new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
- if (new_ptrs_size < paca_ptrs_size)
- memblock_phys_free(__pa(paca_ptrs) + new_ptrs_size,
- paca_ptrs_size - new_ptrs_size);
- paca_nr_cpu_ids = nr_cpu_ids;
- paca_ptrs_size = new_ptrs_size;
- #ifdef CONFIG_PPC_64S_HASH_MMU
- if (early_radix_enabled()) {
- /* Ugly fixup, see new_slb_shadow() */
- memblock_phys_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
- sizeof(struct slb_shadow));
- paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
- }
- #endif
- printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
- paca_ptrs_size + paca_struct_size, nr_cpu_ids);
- }
- #ifdef CONFIG_PPC_64S_HASH_MMU
- void copy_mm_to_paca(struct mm_struct *mm)
- {
- mm_context_t *context = &mm->context;
- VM_BUG_ON(!mm_ctx_slb_addr_limit(context));
- memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context),
- LOW_SLICE_ARRAY_SZ);
- memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context),
- TASK_SLICE_ARRAY_SZ(context));
- }
- #endif /* CONFIG_PPC_64S_HASH_MMU */
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