Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 152 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/tlbflush.h b/arch/alpha/include/asm/tlbflush.h
new file mode 100644
index 0000000000..94dc37cf87
--- /dev/null
+++ b/arch/alpha/include/asm/tlbflush.h
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ALPHA_TLBFLUSH_H
+#define _ALPHA_TLBFLUSH_H
+
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <asm/compiler.h>
+
+#ifndef __EXTERN_INLINE
+#define __EXTERN_INLINE extern inline
+#define __MMU_EXTERN_INLINE
+#endif
+
+extern void __load_new_mm_context(struct mm_struct *);
+
+
+/* Use a few helper functions to hide the ugly broken ASN
+   numbers on early Alphas (ev4 and ev45).  */
+
+__EXTERN_INLINE void
+ev4_flush_tlb_current(struct mm_struct *mm)
+{
+	__load_new_mm_context(mm);
+	tbiap();
+}
+
+__EXTERN_INLINE void
+ev5_flush_tlb_current(struct mm_struct *mm)
+{
+	__load_new_mm_context(mm);
+}
+
+/* Flush just one page in the current TLB set.  We need to be very
+   careful about the icache here, there is no way to invalidate a
+   specific icache page.  */
+
+__EXTERN_INLINE void
+ev4_flush_tlb_current_page(struct mm_struct * mm,
+			   struct vm_area_struct *vma,
+			   unsigned long addr)
+{
+	int tbi_flag = 2;
+	if (vma->vm_flags & VM_EXEC) {
+		__load_new_mm_context(mm);
+		tbi_flag = 3;
+	}
+	tbi(tbi_flag, addr);
+}
+
+__EXTERN_INLINE void
+ev5_flush_tlb_current_page(struct mm_struct * mm,
+			   struct vm_area_struct *vma,
+			   unsigned long addr)
+{
+	if (vma->vm_flags & VM_EXEC)
+		__load_new_mm_context(mm);
+	else
+		tbi(2, addr);
+}
+
+
+#ifdef CONFIG_ALPHA_GENERIC
+# define flush_tlb_current		alpha_mv.mv_flush_tlb_current
+# define flush_tlb_current_page		alpha_mv.mv_flush_tlb_current_page
+#else
+# ifdef CONFIG_ALPHA_EV4
+#  define flush_tlb_current		ev4_flush_tlb_current
+#  define flush_tlb_current_page	ev4_flush_tlb_current_page
+# else
+#  define flush_tlb_current		ev5_flush_tlb_current
+#  define flush_tlb_current_page	ev5_flush_tlb_current_page
+# endif
+#endif
+
+#ifdef __MMU_EXTERN_INLINE
+#undef __EXTERN_INLINE
+#undef __MMU_EXTERN_INLINE
+#endif
+
+/* Flush current user mapping.  */
+static inline void
+flush_tlb(void)
+{
+	flush_tlb_current(current->active_mm);
+}
+
+/* Flush someone else's user mapping.  */
+static inline void
+flush_tlb_other(struct mm_struct *mm)
+{
+	unsigned long *mmc = &mm->context[smp_processor_id()];
+	/* Check it's not zero first to avoid cacheline ping pong
+	   when possible.  */
+	if (*mmc) *mmc = 0;
+}
+
+#ifndef CONFIG_SMP
+/* Flush everything (kernel mapping may also have changed
+   due to vmalloc/vfree).  */
+static inline void flush_tlb_all(void)
+{
+	tbia();
+}
+
+/* Flush a specified user mapping.  */
+static inline void
+flush_tlb_mm(struct mm_struct *mm)
+{
+	if (mm == current->active_mm)
+		flush_tlb_current(mm);
+	else
+		flush_tlb_other(mm);
+}
+
+/* Page-granular tlb flush.  */
+static inline void
+flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
+{
+	struct mm_struct *mm = vma->vm_mm;
+
+	if (mm == current->active_mm)
+		flush_tlb_current_page(mm, vma, addr);
+	else
+		flush_tlb_other(mm);
+}
+
+/* Flush a specified range of user mapping.  On the Alpha we flush
+   the whole user tlb.  */
+static inline void
+flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+		unsigned long end)
+{
+	flush_tlb_mm(vma->vm_mm);
+}
+
+#else /* CONFIG_SMP */
+
+extern void flush_tlb_all(void);
+extern void flush_tlb_mm(struct mm_struct *);
+extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
+extern void flush_tlb_range(struct vm_area_struct *, unsigned long,
+			    unsigned long);
+
+#endif /* CONFIG_SMP */
+
+static inline void flush_tlb_kernel_range(unsigned long start,
+					unsigned long end)
+{
+	flush_tlb_all();
+}
+
+#endif /* _ALPHA_TLBFLUSH_H */