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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// 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 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
79out_unlock:
80 mmap_read_unlock(mm);
81 return ret;
82}
83EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
84
85int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
86{
87 u64 vsid, vsidkey;
88 int psize, ssize;
89
90 switch (get_region_id(ea)) {
91 case USER_REGION_ID:
92 pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
93 if (mm == NULL)
94 return 1;
95 psize = get_slice_psize(mm, ea);
96 ssize = user_segment_size(ea);
97 vsid = get_user_vsid(&mm->context, ea, ssize);
98 vsidkey = SLB_VSID_USER;
99 break;
100 case VMALLOC_REGION_ID:
101 pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
102 psize = mmu_vmalloc_psize;
103 ssize = mmu_kernel_ssize;
104 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
105 vsidkey = SLB_VSID_KERNEL;
106 break;
107 case IO_REGION_ID:
108 pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea);
109 psize = mmu_io_psize;
110 ssize = mmu_kernel_ssize;
111 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
112 vsidkey = SLB_VSID_KERNEL;
113 break;
114 case LINEAR_MAP_REGION_ID:
115 pr_devel("%s: 0x%llx -- LINEAR_MAP_REGION_ID\n", __func__, ea);
116 psize = mmu_linear_psize;
117 ssize = mmu_kernel_ssize;
118 vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
119 vsidkey = SLB_VSID_KERNEL;
120 break;
121 default:
122 pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
123 return 1;
124 }
125 /* Bad address */
126 if (!vsid)
127 return 1;
128
129 vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
130
131 vsid |= mmu_psize_defs[psize].sllp |
132 ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
133
134 slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
135 slb->vsid = vsid;
136
137 return 0;
138}
139EXPORT_SYMBOL_GPL(copro_calculate_slb);
140
141void copro_flush_all_slbs(struct mm_struct *mm)
142{
143#ifdef CONFIG_SPU_BASE
144 spu_flush_all_slbs(mm);
145#endif
146 cxl_slbia(mm);
147}
148EXPORT_SYMBOL_GPL(copro_flush_all_slbs);