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From: daichengrong@iscas.ac.cn
To: ffmpeg-devel@ffmpeg.org
Date: Fri, 14 Mar 2025 18:32:57 +0800
Message-Id: <20250314103257.3584723-1-daichengrong@iscas.ac.cn>
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Subject: [FFmpeg-devel] [PATCH] RISC-V:update ff_get_cpu_flags_riscv for RVV
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From: daichengrong <daichengrong@iscas.ac.cn>
Availability of RVV and ZVBB should be determined with dl_hwcap.
As those extensions rely on vector registers, kernel vector support
is required to save the state of context switching.
FFmpeg requires hwprobe for hardware capability detection, and cooperates
with dl_hwcap to detect whether the kernel supports vector.
---
libavutil/riscv/cpu.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/libavutil/riscv/cpu.c b/libavutil/riscv/cpu.c
index 163e4fc14a..fad63eccea 100644
--- a/libavutil/riscv/cpu.c
+++ b/libavutil/riscv/cpu.c
@@ -55,6 +55,10 @@ int ff_get_cpu_flags_riscv(void)
{ RISCV_HWPROBE_KEY_CPUPERF_0, 0 },
};
+#if HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
+ const unsigned long hwcap = ff_getauxval(AT_HWCAP);
+#endif
+
if (__riscv_hwprobe(pairs, FF_ARRAY_ELEMS(pairs), 0, NULL, 0) == 0) {
if (pairs[0].value & RISCV_HWPROBE_BASE_BEHAVIOR_IMA)
ret |= AV_CPU_FLAG_RVI;
@@ -62,6 +66,12 @@ int ff_get_cpu_flags_riscv(void)
if (pairs[1].value & RISCV_HWPROBE_IMA_V)
ret |= AV_CPU_FLAG_RVV_I32 | AV_CPU_FLAG_RVV_I64
| AV_CPU_FLAG_RVV_F32 | AV_CPU_FLAG_RVV_F64;
+#if HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
+ /* The V extension implies all Zve* functional subsets */
+ if (!(hwcap & HWCAP_RV('V')))
+ ret &= ~(AV_CPU_FLAG_RVV_I32 | AV_CPU_FLAG_RVV_I64
+ | AV_CPU_FLAG_RVV_F32 | AV_CPU_FLAG_RVV_F64);
+#endif
#endif
#ifdef RISCV_HWPROBE_EXT_ZBB
if (pairs[1].value & RISCV_HWPROBE_EXT_ZBB)
@@ -76,6 +86,10 @@ int ff_get_cpu_flags_riscv(void)
#ifdef RISCV_HWPROBE_EXT_ZVBB
if (pairs[1].value & RISCV_HWPROBE_EXT_ZVBB)
ret |= AV_CPU_FLAG_RV_ZVBB;
+#if HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
+ if (!(hwcap & HWCAP_RV('V')))
+ ret &= ~AV_CPU_FLAG_RV_ZVBB;
+#endif
#endif
switch (pairs[2].value & RISCV_HWPROBE_MISALIGNED_MASK) {
case RISCV_HWPROBE_MISALIGNED_FAST:
--
2.25.1
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