[dpdk-dev] [PATCH] eal/ppc64: improve rte_rdtsc with ppc_get_timebase
Thinh Tran
thinhtr at linux.vnet.ibm.com
Fri Jan 31 15:54:04 CET 2020
Need to resubmit a new patch, since the same code may be used by other
ppc platform such as FreeBSD that may not have the sys/platform/ppc.h
Thinh Tran
On 1/28/2020 3:02 PM, Thinh Tran wrote:
> __ppc_get_timebase() is GNU extention and is more efficient
>
> Signed-off-by: Thinh Tran <thinhtr at linux.vnet.ibm.com>
> ---
> .../common/include/arch/ppc_64/rte_cycles.h | 28 ++-----------------
> 1 file changed, 2 insertions(+), 26 deletions(-)
>
> diff --git a/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h b/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
> index 8f2e98642..871f9b6e4 100644
> --- a/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
> +++ b/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
> @@ -14,6 +14,7 @@ extern "C" {
>
> #include <rte_byteorder.h>
> #include <rte_common.h>
> +#include <sys/platform/ppc.h>
>
> /**
> * Read the time base register.
> @@ -24,32 +25,7 @@ extern "C" {
> static inline uint64_t
> rte_rdtsc(void)
> {
> - union {
> - uint64_t tsc_64;
> - RTE_STD_C11
> - struct {
> -#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
> - uint32_t hi_32;
> - uint32_t lo_32;
> -#else
> - uint32_t lo_32;
> - uint32_t hi_32;
> -#endif
> - };
> - } tsc;
> - uint32_t tmp;
> -
> - asm volatile(
> - "0:\n"
> - "mftbu %[hi32]\n"
> - "mftb %[lo32]\n"
> - "mftbu %[tmp]\n"
> - "cmpw %[tmp],%[hi32]\n"
> - "bne 0b\n"
> - : [hi32] "=r"(tsc.hi_32), [lo32] "=r"(tsc.lo_32),
> - [tmp] "=r"(tmp)
> - );
> - return tsc.tsc_64;
> + return __ppc_get_timebase();
> }
>
> static inline uint64_t
>
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