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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * CoProcessor (SPU/AFU) mm fault handler
4 *
5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2007
6 *
7 * Author: Arnd Bergmann <arndb@de.ibm.com>
8 * Author: Jeremy Kerr <jk@ozlabs.org>
9 */
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/export.h>
13#include <asm/reg.h>
14#include <asm/copro.h>
15#include <asm/spu.h>
16#include <misc/cxl-base.h>
17
18/*
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.
22 */
23int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
24 unsigned long dsisr, vm_fault_t *flt)
25{
26 struct vm_area_struct *vma;
27 unsigned long is_write;
28 int ret;
29
30 if (mm == NULL)
31 return -EFAULT;
32
33 if (mm->pgd == NULL)
34 return -EFAULT;
35
36 mmap_read_lock(mm);
37 ret = -EFAULT;
38 vma = find_vma(mm, ea);
39 if (!vma)
40 goto out_unlock;
41
42 if (ea < vma->vm_start) {
43 if (!(vma->vm_flags & VM_GROWSDOWN))
44 goto out_unlock;
45 if (expand_stack(vma, ea))
46 goto out_unlock;
47 }
48
49 is_write = dsisr & DSISR_ISSTORE;
50 if (is_write) {
51 if (!(vma->vm_flags & VM_WRITE))
52 goto out_unlock;
53 } else {
54 if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
55 goto out_unlock;
56 /*
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
60 * like autonuma.
61 */
62 if (!radix_enabled())
63 WARN_ON_ONCE(dsisr & DSISR_PROTFAULT);
64 }
65
66 ret = 0;
67 *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0, NULL);
68
69 /* The fault is fully completed (including releasing mmap lock) */
70 if (*flt & VM_FAULT_COMPLETED)
71 return 0;
72
73 if (unlikely(*flt & VM_FAULT_ERROR)) {
74 if (*flt & VM_FAULT_OOM) {
75 ret = -ENOMEM;
76 goto out_unlock;
77 } else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
78 ret = -EFAULT;
79 goto out_unlock;
80 }
81 BUG();
82 }
83
84out_unlock:
85 mmap_read_unlock(mm);
86 return ret;
87}
88EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
89
90#ifdef CONFIG_PPC_64S_HASH_MMU
91int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
92{
93 u64 vsid, vsidkey;
94 int psize, ssize;
95
96 switch (get_region_id(ea)) {
97 case USER_REGION_ID:
98 pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
99 if (mm == NULL)
100 return 1;
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;
105 break;
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;
112 break;
113 case IO_REGION_ID:
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;
119 break;
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;
126 break;
127 default:
128 pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
129 return 1;
130 }
131 /* Bad address */
132 if (!vsid)
133 return 1;
134
135 vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
136
137 vsid |= mmu_psize_defs[psize].sllp |
138 ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
139
140 slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
141 slb->vsid = vsid;
142
143 return 0;
144}
145EXPORT_SYMBOL_GPL(copro_calculate_slb);
146
147void copro_flush_all_slbs(struct mm_struct *mm)
148{
149#ifdef CONFIG_SPU_BASE
150 spu_flush_all_slbs(mm);
151#endif
152 cxl_slbia(mm);
153}
154EXPORT_SYMBOL_GPL(copro_flush_all_slbs);
155#endif
1/*
2 * CoProcessor (SPU/AFU) mm fault handler
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>
25#include <linux/export.h>
26#include <asm/reg.h>
27#include <asm/copro.h>
28#include <asm/spu.h>
29#include <misc/cxl-base.h>
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 */
36int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
37 unsigned long dsisr, unsigned *flt)
38{
39 struct vm_area_struct *vma;
40 unsigned long is_write;
41 int ret;
42
43 if (mm == NULL)
44 return -EFAULT;
45
46 if (mm->pgd == NULL)
47 return -EFAULT;
48
49 down_read(&mm->mmap_sem);
50 ret = -EFAULT;
51 vma = find_vma(mm, ea);
52 if (!vma)
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
62 is_write = dsisr & DSISR_ISSTORE;
63 if (is_write) {
64 if (!(vma->vm_flags & VM_WRITE))
65 goto out_unlock;
66 } else {
67 if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
68 goto out_unlock;
69 /*
70 * protfault should only happen due to us
71 * mapping a region readonly temporarily. PROT_NONE
72 * is also covered by the VMA check above.
73 */
74 WARN_ON_ONCE(dsisr & DSISR_PROTFAULT);
75 }
76
77 ret = 0;
78 *flt = handle_mm_fault(mm, vma, ea, is_write ? FAULT_FLAG_WRITE : 0);
79 if (unlikely(*flt & VM_FAULT_ERROR)) {
80 if (*flt & VM_FAULT_OOM) {
81 ret = -ENOMEM;
82 goto out_unlock;
83 } else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
84 ret = -EFAULT;
85 goto out_unlock;
86 }
87 BUG();
88 }
89
90 if (*flt & VM_FAULT_MAJOR)
91 current->maj_flt++;
92 else
93 current->min_flt++;
94
95out_unlock:
96 up_read(&mm->mmap_sem);
97 return ret;
98}
99EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
100
101int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
102{
103 u64 vsid, vsidkey;
104 int psize, ssize;
105
106 switch (REGION_ID(ea)) {
107 case USER_REGION_ID:
108 pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
109 psize = get_slice_psize(mm, ea);
110 ssize = user_segment_size(ea);
111 vsid = get_vsid(mm->context.id, ea, ssize);
112 vsidkey = SLB_VSID_USER;
113 break;
114 case VMALLOC_REGION_ID:
115 pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
116 if (ea < VMALLOC_END)
117 psize = mmu_vmalloc_psize;
118 else
119 psize = mmu_io_psize;
120 ssize = mmu_kernel_ssize;
121 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
122 vsidkey = SLB_VSID_KERNEL;
123 break;
124 case KERNEL_REGION_ID:
125 pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea);
126 psize = mmu_linear_psize;
127 ssize = mmu_kernel_ssize;
128 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
129 vsidkey = SLB_VSID_KERNEL;
130 break;
131 default:
132 pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
133 return 1;
134 }
135
136 vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
137
138 vsid |= mmu_psize_defs[psize].sllp |
139 ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
140
141 slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
142 slb->vsid = vsid;
143
144 return 0;
145}
146EXPORT_SYMBOL_GPL(copro_calculate_slb);
147
148void copro_flush_all_slbs(struct mm_struct *mm)
149{
150#ifdef CONFIG_SPU_BASE
151 spu_flush_all_slbs(mm);
152#endif
153 cxl_slbia(mm);
154}
155EXPORT_SYMBOL_GPL(copro_flush_all_slbs);