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MIPS: asm: pgtable: Add c0 hazards on HTW start/stop sequences

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When we use htw_{start,stop}() outside of htw_reset(), we need
to ensure that c0 changes have been propagated properly before
we attempt to continue with subsequence memory operations.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: <stable@vger.kernel.org> # 3.17+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9114/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Markos Chandras 2015-01-26 09:40:34 +00:00 committed by Ralf Baechle
parent d79d853df1
commit 461d1597ff
1 changed files with 6 additions and 4 deletions
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10
arch/mips/include/asm/pgtable.h
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@ -99,16 +99,20 @@ extern void paging_init(void);
#define htw_stop() \
do { \
if (cpu_has_htw) \
if (cpu_has_htw) { \
write_c0_pwctl(read_c0_pwctl() & \
~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
back_to_back_c0_hazard(); \
} \
} while(0)
#define htw_start() \
do { \
if (cpu_has_htw) \
if (cpu_has_htw) { \
write_c0_pwctl(read_c0_pwctl() | \
(1 << MIPS_PWCTL_PWEN_SHIFT)); \
back_to_back_c0_hazard(); \
} \
} while(0)
@ -116,9 +120,7 @@ do { \
do { \
if (cpu_has_htw) { \
htw_stop(); \
back_to_back_c0_hazard(); \
htw_start(); \
back_to_back_c0_hazard(); \
} \
} while(0)