Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 103 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/tlbflush.h b/arch/ia64/include/asm/tlbflush.h
new file mode 100644
index 000000000..25e280810
--- /dev/null
+++ b/arch/ia64/include/asm/tlbflush.h
@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_IA64_TLBFLUSH_H
+#define _ASM_IA64_TLBFLUSH_H
+
+/*
+ * Copyright (C) 2002 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+
+#include <linux/mm.h>
+
+#include <asm/intrinsics.h>
+#include <asm/mmu_context.h>
+#include <asm/page.h>
+
+/*
+ * Now for some TLB flushing routines.  This is the kind of stuff that
+ * can be very expensive, so try to avoid them whenever possible.
+ */
+extern void setup_ptcg_sem(int max_purges, int from_palo);
+
+/*
+ * Flush everything (kernel mapping may also have changed due to
+ * vmalloc/vfree).
+ */
+extern void local_flush_tlb_all (void);
+
+#ifdef CONFIG_SMP
+  extern void smp_flush_tlb_all (void);
+  extern void smp_flush_tlb_mm (struct mm_struct *mm);
+  extern void smp_flush_tlb_cpumask (cpumask_t xcpumask);
+# define flush_tlb_all()	smp_flush_tlb_all()
+#else
+# define flush_tlb_all()	local_flush_tlb_all()
+# define smp_flush_tlb_cpumask(m) local_flush_tlb_all()
+#endif
+
+static inline void
+local_finish_flush_tlb_mm (struct mm_struct *mm)
+{
+	if (mm == current->active_mm)
+		activate_context(mm);
+}
+
+/*
+ * Flush a specified user mapping.  This is called, e.g., as a result of fork() and
+ * exit().  fork() ends up here because the copy-on-write mechanism needs to write-protect
+ * the PTEs of the parent task.
+ */
+static inline void
+flush_tlb_mm (struct mm_struct *mm)
+{
+	if (!mm)
+		return;
+
+	set_bit(mm->context, ia64_ctx.flushmap);
+	mm->context = 0;
+
+	if (atomic_read(&mm->mm_users) == 0)
+		return;		/* happens as a result of exit_mmap() */
+
+#ifdef CONFIG_SMP
+	smp_flush_tlb_mm(mm);
+#else
+	local_finish_flush_tlb_mm(mm);
+#endif
+}
+
+extern void flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long end);
+
+/*
+ * Page-granular tlb flush.
+ */
+static inline void
+flush_tlb_page (struct vm_area_struct *vma, unsigned long addr)
+{
+#ifdef CONFIG_SMP
+	flush_tlb_range(vma, (addr & PAGE_MASK), (addr & PAGE_MASK) + PAGE_SIZE);
+#else
+	if (vma->vm_mm == current->active_mm)
+		ia64_ptcl(addr, (PAGE_SHIFT << 2));
+	else
+		vma->vm_mm->context = 0;
+#endif
+}
+
+/*
+ * Flush the local TLB. Invoked from another cpu using an IPI.
+ */
+#ifdef CONFIG_SMP
+void smp_local_flush_tlb(void);
+#else
+#define smp_local_flush_tlb()
+#endif
+
+static inline void flush_tlb_kernel_range(unsigned long start,
+					  unsigned long end)
+{
+	flush_tlb_all();	/* XXX fix me */
+}
+
+#endif /* _ASM_IA64_TLBFLUSH_H */