1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * CoProcessor (SPU/AFU) mm fault handler
5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2007
10 #include <linux/sched.h>
12 #include <linux/export.h>
14 #include <asm/copro.h>
16 #include <misc/cxl-base.h>
19 * This ought to be kept in sync with the powerpc specific do_page_fault
20 * function. Currently, there are a few corner cases that we haven't had
21 * to handle fortunately.
23 int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
24 unsigned long dsisr, vm_fault_t *flt)
26 struct vm_area_struct *vma;
27 unsigned long is_write;
38 vma = find_vma(mm, ea);
42 if (ea < vma->vm_start) {
43 if (!(vma->vm_flags & VM_GROWSDOWN))
45 if (expand_stack(vma, ea))
49 is_write = dsisr & DSISR_ISSTORE;
51 if (!(vma->vm_flags & VM_WRITE))
54 if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
57 * PROT_NONE is covered by the VMA check above.
58 * and hash should get a NOHPTE fault instead of
59 * a PROTFAULT in case fixup is needed for things
63 WARN_ON_ONCE(dsisr & DSISR_PROTFAULT);
67 *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0, NULL);
69 /* The fault is fully completed (including releasing mmap lock) */
70 if (*flt & VM_FAULT_COMPLETED)
73 if (unlikely(*flt & VM_FAULT_ERROR)) {
74 if (*flt & VM_FAULT_OOM) {
77 } else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
88 EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
90 #ifdef CONFIG_PPC_64S_HASH_MMU
91 int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
96 switch (get_region_id(ea)) {
98 pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
101 psize = get_slice_psize(mm, ea);
102 ssize = user_segment_size(ea);
103 vsid = get_user_vsid(&mm->context, ea, ssize);
104 vsidkey = SLB_VSID_USER;
106 case VMALLOC_REGION_ID:
107 pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
108 psize = mmu_vmalloc_psize;
109 ssize = mmu_kernel_ssize;
110 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
111 vsidkey = SLB_VSID_KERNEL;
114 pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea);
115 psize = mmu_io_psize;
116 ssize = mmu_kernel_ssize;
117 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
118 vsidkey = SLB_VSID_KERNEL;
120 case LINEAR_MAP_REGION_ID:
121 pr_devel("%s: 0x%llx -- LINEAR_MAP_REGION_ID\n", __func__, ea);
122 psize = mmu_linear_psize;
123 ssize = mmu_kernel_ssize;
124 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
125 vsidkey = SLB_VSID_KERNEL;
128 pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
135 vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
137 vsid |= mmu_psize_defs[psize].sllp |
138 ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
140 slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
145 EXPORT_SYMBOL_GPL(copro_calculate_slb);
147 void copro_flush_all_slbs(struct mm_struct *mm)
149 #ifdef CONFIG_SPU_BASE
150 spu_flush_all_slbs(mm);
154 EXPORT_SYMBOL_GPL(copro_flush_all_slbs);