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