linux/arch/powerpc/mm/copro_fault.c
Thomas Gleixner de6cc6515a treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 153
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 or at your option any
  later version this program is distributed in the hope that it will
  be useful but without any warranty without even the implied warranty
  of merchantability or fitness for a particular purpose see the gnu
  general public license for more details you should have received a
  copy of the gnu general public license along with this program if
  not write to the free software foundation inc 675 mass ave cambridge
  ma 02139 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 77 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Armijn Hemel <armijn@tjaldur.nl>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.837555891@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

154 lines
3.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* CoProcessor (SPU/AFU) mm fault handler
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2007
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
* Author: Jeremy Kerr <jk@ozlabs.org>
*/
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <asm/reg.h>
#include <asm/copro.h>
#include <asm/spu.h>
#include <misc/cxl-base.h>
/*
* This ought to be kept in sync with the powerpc specific do_page_fault
* function. Currently, there are a few corner cases that we haven't had
* to handle fortunately.
*/
int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
unsigned long dsisr, vm_fault_t *flt)
{
struct vm_area_struct *vma;
unsigned long is_write;
int ret;
if (mm == NULL)
return -EFAULT;
if (mm->pgd == NULL)
return -EFAULT;
down_read(&mm->mmap_sem);
ret = -EFAULT;
vma = find_vma(mm, ea);
if (!vma)
goto out_unlock;
if (ea < vma->vm_start) {
if (!(vma->vm_flags & VM_GROWSDOWN))
goto out_unlock;
if (expand_stack(vma, ea))
goto out_unlock;
}
is_write = dsisr & DSISR_ISSTORE;
if (is_write) {
if (!(vma->vm_flags & VM_WRITE))
goto out_unlock;
} else {
if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
goto out_unlock;
/*
* PROT_NONE is covered by the VMA check above.
* and hash should get a NOHPTE fault instead of
* a PROTFAULT in case fixup is needed for things
* like autonuma.
*/
if (!radix_enabled())
WARN_ON_ONCE(dsisr & DSISR_PROTFAULT);
}
ret = 0;
*flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0);
if (unlikely(*flt & VM_FAULT_ERROR)) {
if (*flt & VM_FAULT_OOM) {
ret = -ENOMEM;
goto out_unlock;
} else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
ret = -EFAULT;
goto out_unlock;
}
BUG();
}
if (*flt & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
out_unlock:
up_read(&mm->mmap_sem);
return ret;
}
EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
{
u64 vsid, vsidkey;
int psize, ssize;
switch (get_region_id(ea)) {
case USER_REGION_ID:
pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
if (mm == NULL)
return 1;
psize = get_slice_psize(mm, ea);
ssize = user_segment_size(ea);
vsid = get_user_vsid(&mm->context, ea, ssize);
vsidkey = SLB_VSID_USER;
break;
case VMALLOC_REGION_ID:
pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
psize = mmu_vmalloc_psize;
ssize = mmu_kernel_ssize;
vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
vsidkey = SLB_VSID_KERNEL;
break;
case IO_REGION_ID:
pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea);
psize = mmu_io_psize;
ssize = mmu_kernel_ssize;
vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
vsidkey = SLB_VSID_KERNEL;
break;
case LINEAR_MAP_REGION_ID:
pr_devel("%s: 0x%llx -- LINEAR_MAP_REGION_ID\n", __func__, ea);
psize = mmu_linear_psize;
ssize = mmu_kernel_ssize;
vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
vsidkey = SLB_VSID_KERNEL;
break;
default:
pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
return 1;
}
/* Bad address */
if (!vsid)
return 1;
vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
vsid |= mmu_psize_defs[psize].sllp |
((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
slb->vsid = vsid;
return 0;
}
EXPORT_SYMBOL_GPL(copro_calculate_slb);
void copro_flush_all_slbs(struct mm_struct *mm)
{
#ifdef CONFIG_SPU_BASE
spu_flush_all_slbs(mm);
#endif
cxl_slbia(mm);
}
EXPORT_SYMBOL_GPL(copro_flush_all_slbs);