| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * CoProcessor (SPU/AFU) mm fault handler |
| * |
| * (C) Copyright IBM Deutschland Entwicklung GmbH 2007 |
| * |
| * Author: Arnd Bergmann <arndb@de.ibm.com> |
| * Author: Jeremy Kerr <jk@ozlabs.org> |
| */ |
| #include <linux/sched.h> |
| #include <linux/mm.h> |
| #include <linux/export.h> |
| #include <asm/reg.h> |
| #include <asm/copro.h> |
| #include <asm/spu.h> |
| #include <misc/cxl-base.h> |
| |
| /* |
| * This ought to be kept in sync with the powerpc specific do_page_fault |
| * function. Currently, there are a few corner cases that we haven't had |
| * to handle fortunately. |
| */ |
| int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea, |
| unsigned long dsisr, vm_fault_t *flt) |
| { |
| struct vm_area_struct *vma; |
| unsigned long is_write; |
| int ret; |
| |
| if (mm == NULL) |
| return -EFAULT; |
| |
| if (mm->pgd == NULL) |
| return -EFAULT; |
| |
| mmap_read_lock(mm); |
| ret = -EFAULT; |
| vma = find_vma(mm, ea); |
| if (!vma) |
| goto out_unlock; |
| |
| if (ea < vma->vm_start) { |
| if (!(vma->vm_flags & VM_GROWSDOWN)) |
| goto out_unlock; |
| if (expand_stack(vma, ea)) |
| goto out_unlock; |
| } |
| |
| is_write = dsisr & DSISR_ISSTORE; |
| if (is_write) { |
| if (!(vma->vm_flags & VM_WRITE)) |
| goto out_unlock; |
| } else { |
| if (!(vma->vm_flags & (VM_READ | VM_EXEC))) |
| goto out_unlock; |
| /* |
| * PROT_NONE is covered by the VMA check above. |
| * and hash should get a NOHPTE fault instead of |
| * a PROTFAULT in case fixup is needed for things |
| * like autonuma. |
| */ |
| if (!radix_enabled()) |
| WARN_ON_ONCE(dsisr & DSISR_PROTFAULT); |
| } |
| |
| ret = 0; |
| *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0, NULL); |
| |
| /* The fault is fully completed (including releasing mmap lock) */ |
| if (*flt & VM_FAULT_COMPLETED) |
| return 0; |
| |
| if (unlikely(*flt & VM_FAULT_ERROR)) { |
| if (*flt & VM_FAULT_OOM) { |
| ret = -ENOMEM; |
| goto out_unlock; |
| } else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) { |
| ret = -EFAULT; |
| goto out_unlock; |
| } |
| BUG(); |
| } |
| |
| out_unlock: |
| mmap_read_unlock(mm); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(copro_handle_mm_fault); |
| |
| #ifdef CONFIG_PPC_64S_HASH_MMU |
| int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb) |
| { |
| u64 vsid, vsidkey; |
| int psize, ssize; |
| |
| switch (get_region_id(ea)) { |
| case USER_REGION_ID: |
| pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea); |
| if (mm == NULL) |
| return 1; |
| psize = get_slice_psize(mm, ea); |
| ssize = user_segment_size(ea); |
| vsid = get_user_vsid(&mm->context, ea, ssize); |
| vsidkey = SLB_VSID_USER; |
| break; |
| case VMALLOC_REGION_ID: |
| pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea); |
| psize = mmu_vmalloc_psize; |
| ssize = mmu_kernel_ssize; |
| vsid = get_kernel_vsid(ea, mmu_kernel_ssize); |
| vsidkey = SLB_VSID_KERNEL; |
| break; |
| case IO_REGION_ID: |
| pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea); |
| psize = mmu_io_psize; |
| ssize = mmu_kernel_ssize; |
| vsid = get_kernel_vsid(ea, mmu_kernel_ssize); |
| vsidkey = SLB_VSID_KERNEL; |
| break; |
| case LINEAR_MAP_REGION_ID: |
| pr_devel("%s: 0x%llx -- LINEAR_MAP_REGION_ID\n", __func__, ea); |
| psize = mmu_linear_psize; |
| ssize = mmu_kernel_ssize; |
| vsid = get_kernel_vsid(ea, mmu_kernel_ssize); |
| vsidkey = SLB_VSID_KERNEL; |
| break; |
| default: |
| pr_debug("%s: invalid region access at %016llx\n", __func__, ea); |
| return 1; |
| } |
| /* Bad address */ |
| if (!vsid) |
| return 1; |
| |
| vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey; |
| |
| vsid |= mmu_psize_defs[psize].sllp | |
| ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0); |
| |
| slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V; |
| slb->vsid = vsid; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(copro_calculate_slb); |
| |
| void copro_flush_all_slbs(struct mm_struct *mm) |
| { |
| #ifdef CONFIG_SPU_BASE |
| spu_flush_all_slbs(mm); |
| #endif |
| cxl_slbia(mm); |
| } |
| EXPORT_SYMBOL_GPL(copro_flush_all_slbs); |
| #endif |