154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* CoProcessor (SPU/AFU) mm fault handler
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2007
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*
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* Author: Arnd Bergmann <arndb@de.ibm.com>
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* Author: Jeremy Kerr <jk@ozlabs.org>
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/export.h>
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#include <asm/reg.h>
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#include <asm/copro.h>
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#include <asm/spu.h>
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#include <misc/cxl-base.h>
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/*
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* This ought to be kept in sync with the powerpc specific do_page_fault
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* function. Currently, there are a few corner cases that we haven't had
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* to handle fortunately.
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*/
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int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
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unsigned long dsisr, vm_fault_t *flt)
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{
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struct vm_area_struct *vma;
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unsigned long is_write;
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int ret;
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if (mm == NULL)
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return -EFAULT;
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if (mm->pgd == NULL)
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return -EFAULT;
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down_read(&mm->mmap_sem);
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ret = -EFAULT;
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vma = find_vma(mm, ea);
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if (!vma)
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goto out_unlock;
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if (ea < vma->vm_start) {
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if (!(vma->vm_flags & VM_GROWSDOWN))
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goto out_unlock;
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if (expand_stack(vma, ea))
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goto out_unlock;
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}
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is_write = dsisr & DSISR_ISSTORE;
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if (is_write) {
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if (!(vma->vm_flags & VM_WRITE))
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goto out_unlock;
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} else {
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if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
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goto out_unlock;
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/*
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* PROT_NONE is covered by the VMA check above.
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* and hash should get a NOHPTE fault instead of
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* a PROTFAULT in case fixup is needed for things
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* like autonuma.
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*/
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if (!radix_enabled())
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WARN_ON_ONCE(dsisr & DSISR_PROTFAULT);
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}
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ret = 0;
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*flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0);
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if (unlikely(*flt & VM_FAULT_ERROR)) {
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if (*flt & VM_FAULT_OOM) {
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ret = -ENOMEM;
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goto out_unlock;
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} else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
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ret = -EFAULT;
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goto out_unlock;
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}
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BUG();
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}
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if (*flt & VM_FAULT_MAJOR)
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current->maj_flt++;
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else
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current->min_flt++;
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out_unlock:
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up_read(&mm->mmap_sem);
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return ret;
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}
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EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
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int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
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{
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u64 vsid, vsidkey;
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int psize, ssize;
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switch (get_region_id(ea)) {
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case USER_REGION_ID:
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pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
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if (mm == NULL)
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return 1;
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psize = get_slice_psize(mm, ea);
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ssize = user_segment_size(ea);
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vsid = get_user_vsid(&mm->context, ea, ssize);
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vsidkey = SLB_VSID_USER;
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break;
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case VMALLOC_REGION_ID:
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pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
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psize = mmu_vmalloc_psize;
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ssize = mmu_kernel_ssize;
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vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
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vsidkey = SLB_VSID_KERNEL;
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break;
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case IO_REGION_ID:
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pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea);
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psize = mmu_io_psize;
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ssize = mmu_kernel_ssize;
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vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
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vsidkey = SLB_VSID_KERNEL;
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break;
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case LINEAR_MAP_REGION_ID:
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pr_devel("%s: 0x%llx -- LINEAR_MAP_REGION_ID\n", __func__, ea);
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psize = mmu_linear_psize;
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ssize = mmu_kernel_ssize;
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vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
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vsidkey = SLB_VSID_KERNEL;
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break;
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default:
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pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
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return 1;
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}
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/* Bad address */
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if (!vsid)
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return 1;
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vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
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vsid |= mmu_psize_defs[psize].sllp |
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((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
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slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
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slb->vsid = vsid;
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return 0;
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}
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EXPORT_SYMBOL_GPL(copro_calculate_slb);
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void copro_flush_all_slbs(struct mm_struct *mm)
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{
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#ifdef CONFIG_SPU_BASE
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spu_flush_all_slbs(mm);
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#endif
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cxl_slbia(mm);
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}
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EXPORT_SYMBOL_GPL(copro_flush_all_slbs);
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