// 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/arch/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;#ifndef CONFIG_PPC_KERNEL_PCREL	new_paca->kernel_toc = kernel_toc_addr();#endif	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_MMUvoid 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 */