v4.19.13 snapshot.
diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
new file mode 100644
index 0000000..c8da352
--- /dev/null
+++ b/arch/powerpc/mm/copro_fault.c
@@ -0,0 +1,162 @@
+/*
+ * 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-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 (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);
+ 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);
+ vsidkey = SLB_VSID_KERNEL;
+ 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);
+ 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);