From fe558028140662ba8488399714d8fe21281851f0 Mon Sep 17 00:00:00 2001 From: Ruifeng Wang Date: Tue, 12 Jan 2021 02:57:07 +0000 Subject: [PATCH] common/octeontx2: fix build with SVE Building with gcc 10.2 with SVE extension enabled got error: {standard input}: Assembler messages: {standard input}:4002: Error: selected processor does not support `mov z3.b,#0' {standard input}:4003: Error: selected processor does not support `whilelo p1.b,xzr,x7' {standard input}:4005: Error: selected processor does not support `ld1b z0.b,p1/z,[x8]' {standard input}:4006: Error: selected processor does not support `whilelo p4.s,wzr,w7' This is because inline assembly code explicitly resets cpu model to not have SVE support. Thus SVE instructions generated by compiler auto vectorization got rejected by assembler. Added SVE to the cpu model specified by inline assembly for SVE support. Not replacing the inline assembly with C atomics because the driver relies on specific LSE instruction to interface to co-processor [1]. Fixes: 8a4f835971f5 ("common/octeontx2: add IO handling APIs") Cc: stable@dpdk.org [1] https://mails.dpdk.org/archives/dev/2021-January/196092.html Signed-off-by: Ruifeng Wang Reviewed-by: Jerin Jacob --- drivers/common/octeontx2/otx2_io_arm64.h | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/common/octeontx2/otx2_io_arm64.h b/drivers/common/octeontx2/otx2_io_arm64.h index b5c85d9a6e..34268e3af3 100644 --- a/drivers/common/octeontx2/otx2_io_arm64.h +++ b/drivers/common/octeontx2/otx2_io_arm64.h @@ -21,6 +21,12 @@ #define otx2_prefetch_store_keep(ptr) ({\ asm volatile("prfm pstl1keep, [%x0]\n" : : "r" (ptr)); }) +#if defined(__ARM_FEATURE_SVE) +#define __LSE_PREAMBLE " .cpu generic+lse+sve\n" +#else +#define __LSE_PREAMBLE " .cpu generic+lse\n" +#endif + static __rte_always_inline uint64_t otx2_atomic64_add_nosync(int64_t incr, int64_t *ptr) { @@ -28,7 +34,7 @@ otx2_atomic64_add_nosync(int64_t incr, int64_t *ptr) /* Atomic add with no ordering */ asm volatile ( - ".cpu generic+lse\n" + __LSE_PREAMBLE "ldadd %x[i], %x[r], [%[b]]" : [r] "=r" (result), "+m" (*ptr) : [i] "r" (incr), [b] "r" (ptr) @@ -43,7 +49,7 @@ otx2_atomic64_add_sync(int64_t incr, int64_t *ptr) /* Atomic add with ordering */ asm volatile ( - ".cpu generic+lse\n" + __LSE_PREAMBLE "ldadda %x[i], %x[r], [%[b]]" : [r] "=r" (result), "+m" (*ptr) : [i] "r" (incr), [b] "r" (ptr) @@ -57,7 +63,7 @@ otx2_lmt_submit(rte_iova_t io_address) uint64_t result; asm volatile ( - ".cpu generic+lse\n" + __LSE_PREAMBLE "ldeor xzr,%x[rf],[%[rs]]" : [rf] "=r"(result): [rs] "r"(io_address)); return result; @@ -69,7 +75,7 @@ otx2_lmt_submit_release(rte_iova_t io_address) uint64_t result; asm volatile ( - ".cpu generic+lse\n" + __LSE_PREAMBLE "ldeorl xzr,%x[rf],[%[rs]]" : [rf] "=r"(result) : [rs] "r"(io_address)); return result; @@ -104,4 +110,5 @@ otx2_lmt_mov_seg(void *out, const void *in, const uint16_t segdw) dst128[i] = src128[i]; } +#undef __LSE_PREAMBLE #endif /* _OTX2_IO_ARM64_H_ */ -- 2.20.1