On 11/9/2023 5:28 AM, Sivaprasad Tummala wrote: > Current get_tsc_freq_arch() implementation is specific for > Intel processors. > > Added vendor checks to gracefully return on AMD EPYC processors. >
Hi Siva, Is this fixing an issue in AMD platform, if so can you please describe the impact of the issue and add fixes tag? > Signed-off-by: Sivaprasad Tummala <sivaprasad.tumm...@amd.com> > --- > lib/eal/x86/rte_cycles.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/lib/eal/x86/rte_cycles.c b/lib/eal/x86/rte_cycles.c > index 69ed59b4f0..f147a5231d 100644 > --- a/lib/eal/x86/rte_cycles.c > +++ b/lib/eal/x86/rte_cycles.c > @@ -10,6 +10,10 @@ > #include <cpuid.h> > #endif > > +#define x86_vendor_amd(t1, t2, t3) \ > + ((t1 == 0x68747541) && /* htuA */ \ > + (t2 == 0x444d4163) && /* DMAc */ \ > + (t3 == 0x69746e65)) /* itne */ > > #include "eal_private.h" > > @@ -110,6 +114,18 @@ get_tsc_freq_arch(void) > uint8_t mult, model; > int32_t ret; > > +#ifdef RTE_TOOLCHAIN_MSVC > + __cpuid(cpuinfo, 0); > We already discussed in the past to abstract the cpuid(), even David sent a patch for it [1]. If this is customer facing issue, OK to get it as it is for the release, but in long term I think better idea to switch to abstract. [1] https://patchwork.dpdk.org/project/dpdk/list/?series=29605&state=* > + a = cpuinfo[0]; > + b = cpuinfo[1]; > + c = cpuinfo[2]; > + d = cpuinfo[3]; > +#else > + __cpuid(0, a, b, c, d); > +#endif > + if (x86_vendor_amd(b, c, d)) > + return 0; > + > /* > * Time Stamp Counter and Nominal Core Crystal Clock > * Information Leaf
