queue-4.19/powerpc-fsl-add-macro-to-flush-the-branch-predictor.patch

   1 From foo@baz Fri Mar 29 16:04:51 CET 2019
   2 From: Michael Ellerman <mpe@ellerman.id.au>
   3 Date: Fri, 29 Mar 2019 22:26:09 +1100
   4 Subject: powerpc/fsl: Add macro to flush the branch predictor
   5 To: stable@vger.kernel.org, gregkh@linuxfoundation.org
   6 Cc: linuxppc-dev@ozlabs.org, diana.craciun@nxp.com, msuchanek@suse.de, christophe.leroy@c-s.fr
   7 Message-ID: <20190329112620.14489-22-mpe@ellerman.id.au>
   8
   9 From: Diana Craciun <diana.craciun@nxp.com>
  10
  11 commit 1cbf8990d79ff69da8ad09e8a3df014e1494462b upstream.
  12
  13 The BUCSR register can be used to invalidate the entries in the
  14 branch prediction mechanisms.
  15
  16 Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
  17 Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
  18 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  19 ---
  20  arch/powerpc/include/asm/ppc_asm.h |   10 ++++++++++
  21  1 file changed, 10 insertions(+)
  22
  23 --- a/arch/powerpc/include/asm/ppc_asm.h
  24 +++ b/arch/powerpc/include/asm/ppc_asm.h
  25 @@ -821,4 +821,14 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
  26         stringify_in_c(.long (_target) - . ;)   \
  27         stringify_in_c(.previous)
  28
  29 +#ifdef CONFIG_PPC_FSL_BOOK3E
  30 +#define BTB_FLUSH(reg)                 \
  31 +       lis reg,BUCSR_INIT@h;           \
  32 +       ori reg,reg,BUCSR_INIT@l;       \
  33 +       mtspr SPRN_BUCSR,reg;           \
  34 +       isync;
  35 +#else
  36 +#define BTB_FLUSH(reg)
  37 +#endif /* CONFIG_PPC_FSL_BOOK3E */
  38 +
  39  #endif /* _ASM_POWERPC_PPC_ASM_H */