Commit | Line | Data |
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7cd58e43 | 1 | /* |
e83d0169 | 2 | * CoProcessor (SPU/AFU) mm fault handler |
7cd58e43 JK |
3 | * |
4 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2007 | |
5 | * | |
6 | * Author: Arnd Bergmann <arndb@de.ibm.com> | |
7 | * Author: Jeremy Kerr <jk@ozlabs.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | #include <linux/sched.h> | |
24 | #include <linux/mm.h> | |
4b16f8e2 | 25 | #include <linux/export.h> |
e83d0169 | 26 | #include <asm/reg.h> |
73d16a6e | 27 | #include <asm/copro.h> |
be3ebfe8 | 28 | #include <asm/spu.h> |
ec249dd8 | 29 | #include <misc/cxl-base.h> |
7cd58e43 JK |
30 | |
31 | /* | |
32 | * This ought to be kept in sync with the powerpc specific do_page_fault | |
33 | * function. Currently, there are a few corner cases that we haven't had | |
34 | * to handle fortunately. | |
35 | */ | |
e83d0169 | 36 | int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea, |
50a7ca3c | 37 | unsigned long dsisr, vm_fault_t *flt) |
7cd58e43 JK |
38 | { |
39 | struct vm_area_struct *vma; | |
40 | unsigned long is_write; | |
41 | int ret; | |
42 | ||
60ee0319 | 43 | if (mm == NULL) |
7cd58e43 | 44 | return -EFAULT; |
60ee0319 JK |
45 | |
46 | if (mm->pgd == NULL) | |
7cd58e43 | 47 | return -EFAULT; |
7cd58e43 JK |
48 | |
49 | down_read(&mm->mmap_sem); | |
60ee0319 | 50 | ret = -EFAULT; |
7cd58e43 JK |
51 | vma = find_vma(mm, ea); |
52 | if (!vma) | |
60ee0319 JK |
53 | goto out_unlock; |
54 | ||
55 | if (ea < vma->vm_start) { | |
56 | if (!(vma->vm_flags & VM_GROWSDOWN)) | |
57 | goto out_unlock; | |
58 | if (expand_stack(vma, ea)) | |
59 | goto out_unlock; | |
60 | } | |
61 | ||
e83d0169 | 62 | is_write = dsisr & DSISR_ISSTORE; |
7cd58e43 JK |
63 | if (is_write) { |
64 | if (!(vma->vm_flags & VM_WRITE)) | |
60ee0319 | 65 | goto out_unlock; |
7cd58e43 | 66 | } else { |
7cd58e43 | 67 | if (!(vma->vm_flags & (VM_READ | VM_EXEC))) |
60ee0319 | 68 | goto out_unlock; |
842915f5 | 69 | /* |
18061c17 AK |
70 | * PROT_NONE is covered by the VMA check above. |
71 | * and hash should get a NOHPTE fault instead of | |
72 | * a PROTFAULT in case fixup is needed for things | |
73 | * like autonuma. | |
842915f5 | 74 | */ |
18061c17 AK |
75 | if (!radix_enabled()) |
76 | WARN_ON_ONCE(dsisr & DSISR_PROTFAULT); | |
7cd58e43 | 77 | } |
60ee0319 | 78 | |
7cd58e43 | 79 | ret = 0; |
dcddffd4 | 80 | *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0); |
7cd58e43 JK |
81 | if (unlikely(*flt & VM_FAULT_ERROR)) { |
82 | if (*flt & VM_FAULT_OOM) { | |
83 | ret = -ENOMEM; | |
60ee0319 | 84 | goto out_unlock; |
33692f27 | 85 | } else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) { |
7cd58e43 | 86 | ret = -EFAULT; |
60ee0319 | 87 | goto out_unlock; |
7cd58e43 JK |
88 | } |
89 | BUG(); | |
90 | } | |
60ee0319 | 91 | |
7cd58e43 JK |
92 | if (*flt & VM_FAULT_MAJOR) |
93 | current->maj_flt++; | |
94 | else | |
95 | current->min_flt++; | |
7cd58e43 | 96 | |
60ee0319 | 97 | out_unlock: |
7cd58e43 | 98 | up_read(&mm->mmap_sem); |
60ee0319 | 99 | return ret; |
7cd58e43 | 100 | } |
e83d0169 | 101 | EXPORT_SYMBOL_GPL(copro_handle_mm_fault); |
73d16a6e IM |
102 | |
103 | int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb) | |
104 | { | |
85a97da9 | 105 | u64 vsid, vsidkey; |
73d16a6e IM |
106 | int psize, ssize; |
107 | ||
0034d395 | 108 | switch (get_region_id(ea)) { |
73d16a6e IM |
109 | case USER_REGION_ID: |
110 | pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea); | |
d2cf909c FB |
111 | if (mm == NULL) |
112 | return 1; | |
73d16a6e IM |
113 | psize = get_slice_psize(mm, ea); |
114 | ssize = user_segment_size(ea); | |
f384796c | 115 | vsid = get_user_vsid(&mm->context, ea, ssize); |
85a97da9 | 116 | vsidkey = SLB_VSID_USER; |
73d16a6e IM |
117 | break; |
118 | case VMALLOC_REGION_ID: | |
119 | pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea); | |
0034d395 AK |
120 | psize = mmu_vmalloc_psize; |
121 | ssize = mmu_kernel_ssize; | |
122 | vsid = get_kernel_vsid(ea, mmu_kernel_ssize); | |
123 | vsidkey = SLB_VSID_KERNEL; | |
124 | break; | |
125 | case IO_REGION_ID: | |
126 | pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea); | |
127 | psize = mmu_io_psize; | |
73d16a6e IM |
128 | ssize = mmu_kernel_ssize; |
129 | vsid = get_kernel_vsid(ea, mmu_kernel_ssize); | |
85a97da9 | 130 | vsidkey = SLB_VSID_KERNEL; |
73d16a6e IM |
131 | break; |
132 | case KERNEL_REGION_ID: | |
133 | pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea); | |
134 | psize = mmu_linear_psize; | |
135 | ssize = mmu_kernel_ssize; | |
136 | vsid = get_kernel_vsid(ea, mmu_kernel_ssize); | |
85a97da9 | 137 | vsidkey = SLB_VSID_KERNEL; |
73d16a6e IM |
138 | break; |
139 | default: | |
140 | pr_debug("%s: invalid region access at %016llx\n", __func__, ea); | |
141 | return 1; | |
142 | } | |
64168f42 AK |
143 | /* Bad address */ |
144 | if (!vsid) | |
145 | return 1; | |
73d16a6e | 146 | |
85a97da9 | 147 | vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey; |
73d16a6e IM |
148 | |
149 | vsid |= mmu_psize_defs[psize].sllp | | |
150 | ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0); | |
151 | ||
03f54397 | 152 | slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V; |
73d16a6e IM |
153 | slb->vsid = vsid; |
154 | ||
155 | return 0; | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(copro_calculate_slb); | |
be3ebfe8 IM |
158 | |
159 | void copro_flush_all_slbs(struct mm_struct *mm) | |
160 | { | |
161 | #ifdef CONFIG_SPU_BASE | |
162 | spu_flush_all_slbs(mm); | |
163 | #endif | |
4c6d9acc | 164 | cxl_slbia(mm); |
be3ebfe8 IM |
165 | } |
166 | EXPORT_SYMBOL_GPL(copro_flush_all_slbs); |