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148 lines
3.5 KiB
148 lines
3.5 KiB
// 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 <[email protected]> |
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* Author: Jeremy Kerr <[email protected]> |
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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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mmap_read_lock(mm); |
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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, NULL); |
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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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out_unlock: |
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mmap_read_unlock(mm); |
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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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