From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <ffmpeg-devel-bounces@ffmpeg.org> Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTPS id 4085D4E6F9 for <ffmpegdev@gitmailbox.com>; Fri, 14 Mar 2025 10:33:32 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 1A6CC68E4A0; Fri, 14 Mar 2025 12:33:28 +0200 (EET) Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 55E7568C846 for <ffmpeg-devel@ffmpeg.org>; Fri, 14 Mar 2025 12:33:19 +0200 (EET) Received: from chengrong-ubuntu-02.home.arpa (unknown [124.16.138.129]) by APP-01 (Coremail) with SMTP id qwCowAD3_dHpBdRnhQooFQ--.20055S2; Fri, 14 Mar 2025 18:33:14 +0800 (CST) 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> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: qwCowAD3_dHpBdRnhQooFQ--.20055S2 X-Coremail-Antispam: 1UD129KBjvJXoW7CF15Ar4DJr1kCryfWFWxWFg_yoW8Zr4kpF Zxtw42vwn3Gw4Syay3tF48AayfGw4rCF4ayr98G3yUJFW3GFsxGrnYya45Cr1Y9F1fZayY 9w15AryFkFWYyFUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkEb7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4 A2jsIEc7CjxVAFwI0_GcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IE w4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jrv_JF1lYx0Ex4A2jsIE14v26r4UJVWxJr 1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4kE6xkIj40Ew7xC0wCY02Av z4vE14v_Gw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4 xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1j6r15 MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I 0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWU JVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x07bYlk 3UUUUU= X-Originating-IP: [124.16.138.129] X-CM-SenderInfo: pgdluxxhqj201qj6x2xfdvhtffof0/ Subject: [FFmpeg-devel] [PATCH] RISC-V:update ff_get_cpu_flags_riscv for RVV X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches <ffmpeg-devel.ffmpeg.org> List-Unsubscribe: <https://ffmpeg.org/mailman/options/ffmpeg-devel>, <mailto:ffmpeg-devel-request@ffmpeg.org?subject=unsubscribe> List-Archive: <https://ffmpeg.org/pipermail/ffmpeg-devel> List-Post: <mailto:ffmpeg-devel@ffmpeg.org> List-Help: <mailto:ffmpeg-devel-request@ffmpeg.org?subject=help> List-Subscribe: <https://ffmpeg.org/mailman/listinfo/ffmpeg-devel>, <mailto:ffmpeg-devel-request@ffmpeg.org?subject=subscribe> Reply-To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" <ffmpeg-devel-bounces@ffmpeg.org> Archived-At: <https://master.gitmailbox.com/ffmpegdev/20250314103257.3584723-1-daichengrong@iscas.ac.cn/> List-Archive: <https://master.gitmailbox.com/ffmpegdev/> List-Post: <mailto:ffmpegdev@gitmailbox.com> 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 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".