Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / powerpc / mm / copro_fault.c

diff --git a/kernel/arch/powerpc/mm/copro_fault.c b/kernel/arch/powerpc/mm/copro_fault.c
new file mode 100644 (file)
index 0000000..f031a47
--- /dev/null
+++ b/kernel/arch/powerpc/mm/copro_fault.c
@@ -0,0 +1,152 @@
+/*
+ * 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>
+ *
+ * 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.
+ */
+#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.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, unsigned *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;
+               /*
+                * protfault should only happen due to us
+                * mapping a region readonly temporarily. PROT_NONE
+                * is also covered by the VMA check above.
+                */
+               WARN_ON_ONCE(dsisr & DSISR_PROTFAULT);
+       }
+
+       ret = 0;
+       *flt = handle_mm_fault(mm, 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;
+       int psize, ssize;
+
+       switch (REGION_ID(ea)) {
+       case USER_REGION_ID:
+               pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
+               psize = get_slice_psize(mm, ea);
+               ssize = user_segment_size(ea);
+               vsid = get_vsid(mm->context.id, ea, ssize);
+               break;
+       case VMALLOC_REGION_ID:
+               pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
+               if (ea < VMALLOC_END)
+                       psize = mmu_vmalloc_psize;
+               else
+                       psize = mmu_io_psize;
+               ssize = mmu_kernel_ssize;
+               vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
+               break;
+       case KERNEL_REGION_ID:
+               pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea);
+               psize = mmu_linear_psize;
+               ssize = mmu_kernel_ssize;
+               vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
+               break;
+       default:
+               pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
+               return 1;
+       }
+
+       vsid = (vsid << slb_vsid_shift(ssize)) | SLB_VSID_USER;
+
+       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);