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Linux/arch/powerpc/mm/copro_fault.c

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  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  */
 36 int 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 
 97 out_unlock:
 98         up_read(&mm->mmap_sem);
 99         return ret;
100 }
101 EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
102 
103 int 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 }
153 EXPORT_SYMBOL_GPL(copro_calculate_slb);
154 
155 void 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 }
162 EXPORT_SYMBOL_GPL(copro_flush_all_slbs);
163 

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