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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 down_read(&mm->mmap_sem);
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);
68 if (unlikely(*flt & VM_FAULT_ERROR)) {
69 if (*flt & VM_FAULT_OOM) {
70 ret = -ENOMEM;
71 goto out_unlock;
72 } else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
73 ret = -EFAULT;
74 goto out_unlock;
75 }
76 BUG();
77 }
78
79 if (*flt & VM_FAULT_MAJOR)
80 current->maj_flt++;
81 else
82 current->min_flt++;
83
84out_unlock:
85 up_read(&mm->mmap_sem);
86 return ret;
87}
88EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
89
90int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
91{
92 u64 vsid, vsidkey;
93 int psize, ssize;
94
95 switch (get_region_id(ea)) {
96 case USER_REGION_ID:
97 pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
98 if (mm == NULL)
99 return 1;
100 psize = get_slice_psize(mm, ea);
101 ssize = user_segment_size(ea);
102 vsid = get_user_vsid(&mm->context, ea, ssize);
103 vsidkey = SLB_VSID_USER;
104 break;
105 case VMALLOC_REGION_ID:
106 pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
107 psize = mmu_vmalloc_psize;
108 ssize = mmu_kernel_ssize;
109 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
110 vsidkey = SLB_VSID_KERNEL;
111 break;
112 case IO_REGION_ID:
113 pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea);
114 psize = mmu_io_psize;
115 ssize = mmu_kernel_ssize;
116 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
117 vsidkey = SLB_VSID_KERNEL;
118 break;
119 case LINEAR_MAP_REGION_ID:
120 pr_devel("%s: 0x%llx -- LINEAR_MAP_REGION_ID\n", __func__, ea);
121 psize = mmu_linear_psize;
122 ssize = mmu_kernel_ssize;
123 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
124 vsidkey = SLB_VSID_KERNEL;
125 break;
126 default:
127 pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
128 return 1;
129 }
130 /* Bad address */
131 if (!vsid)
132 return 1;
133
134 vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
135
136 vsid |= mmu_psize_defs[psize].sllp |
137 ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
138
139 slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
140 slb->vsid = vsid;
141
142 return 0;
143}
144EXPORT_SYMBOL_GPL(copro_calculate_slb);
145
146void copro_flush_all_slbs(struct mm_struct *mm)
147{
148#ifdef CONFIG_SPU_BASE
149 spu_flush_all_slbs(mm);
150#endif
151 cxl_slbia(mm);
152}
153EXPORT_SYMBOL_GPL(copro_flush_all_slbs);
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 * 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.
74 */
75 if (!radix_enabled())
76 WARN_ON_ONCE(dsisr & DSISR_PROTFAULT);
77 }
78
79 ret = 0;
80 *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0);
81 if (unlikely(*flt & VM_FAULT_ERROR)) {
82 if (*flt & VM_FAULT_OOM) {
83 ret = -ENOMEM;
84 goto out_unlock;
85 } else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
86 ret = -EFAULT;
87 goto out_unlock;
88 }
89 BUG();
90 }
91
92 if (*flt & VM_FAULT_MAJOR)
93 current->maj_flt++;
94 else
95 current->min_flt++;
96
97out_unlock:
98 up_read(&mm->mmap_sem);
99 return ret;
100}
101EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
102
103int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
104{
105 u64 vsid, vsidkey;
106 int psize, ssize;
107
108 switch (REGION_ID(ea)) {
109 case USER_REGION_ID:
110 pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
111 if (mm == NULL)
112 return 1;
113 psize = get_slice_psize(mm, ea);
114 ssize = user_segment_size(ea);
115 vsid = get_user_vsid(&mm->context, ea, ssize);
116 vsidkey = SLB_VSID_USER;
117 break;
118 case VMALLOC_REGION_ID:
119 pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
120 if (ea < VMALLOC_END)
121 psize = mmu_vmalloc_psize;
122 else
123 psize = mmu_io_psize;
124 ssize = mmu_kernel_ssize;
125 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
126 vsidkey = SLB_VSID_KERNEL;
127 break;
128 case KERNEL_REGION_ID:
129 pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea);
130 psize = mmu_linear_psize;
131 ssize = mmu_kernel_ssize;
132 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
133 vsidkey = SLB_VSID_KERNEL;
134 break;
135 default:
136 pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
137 return 1;
138 }
139 /* Bad address */
140 if (!vsid)
141 return 1;
142
143 vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
144
145 vsid |= mmu_psize_defs[psize].sllp |
146 ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
147
148 slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
149 slb->vsid = vsid;
150
151 return 0;
152}
153EXPORT_SYMBOL_GPL(copro_calculate_slb);
154
155void copro_flush_all_slbs(struct mm_struct *mm)
156{
157#ifdef CONFIG_SPU_BASE
158 spu_flush_all_slbs(mm);
159#endif
160 cxl_slbia(mm);
161}
162EXPORT_SYMBOL_GPL(copro_flush_all_slbs);