cl_flush() and sb() only works for i386 and x86_64 in fill_buf.c, so on aarch64 both compile to empty function. mem_flush() walks the buffer calling no-op cl_flush() per cache line and finishes with a no-op sb(), leaving any caller that expects a flushed buffer, e.g. CMT, L3_CAT operating on unflushed state with no warning.
Add code block for aarch64 using the ARM equivalents * "dc civac, %0" for cl_flush() * "dsb sy" for sb() Both are EL0-accessible on Linux aarch64. Signed-off-by: Richard Cheng <[email protected]> --- tools/testing/selftests/resctrl/fill_buf.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c index 19a01a52dc1a..a41d21e5a64e 100644 --- a/tools/testing/selftests/resctrl/fill_buf.c +++ b/tools/testing/selftests/resctrl/fill_buf.c @@ -27,6 +27,9 @@ static void sb(void) #if defined(__i386) || defined(__x86_64) asm volatile("sfence\n\t" : : : "memory"); +#elif defined(__aarch64__) + asm volatile("dsb sy\n\t" + : : : "memory"); #endif } @@ -35,6 +38,9 @@ static void cl_flush(void *p) #if defined(__i386) || defined(__x86_64) asm volatile("clflush (%0)\n\t" : : "r"(p) : "memory"); +#elif defined(__aarch64__) + asm volatile("dc civac, %0\n\t" + : : "r"(p) : "memory"); #endif } -- 2.43.0
