From nobody Mon Feb 9 16:45:48 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3168EB64DD for ; Thu, 13 Jul 2023 12:12:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234543AbjGMMMi (ORCPT ); Thu, 13 Jul 2023 08:12:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230027AbjGMMMf (ORCPT ); Thu, 13 Jul 2023 08:12:35 -0400 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A87E1FEA; Thu, 13 Jul 2023 05:12:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1689250354; x=1720786354; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9j52FthJZNa9Xc0YEIj+5Oie+v4CQc4EqZA27meU8go=; b=s6EZEkJ7Jmyh+stjmzUm/Kk2gKHpCKz23rtEh6QEe4OLcF/b5xLAUjNH 5J7ObTBstkD2c/n7qLI7KLZtHXH4v2kmNtk5E+u4tiJJ9JywyDXZ98KZr iwRLP1j13AgthxNm9uDElZeCPIBIBRWl/5PmRgRoTbQ+i6f2OBtEqhlXH AXQIOMWNiXZo4nDvBs7kL+55gXRJih7E8l7konqjuVqaohOPgX9Je5CCO 2AYUK4/X80Z13Ye59rTyu1JnAQqDMoxyv69KANf6lphueNqS7ch9zz3wA eZtwNubkpnYef5iu+y3i4zI9KWbZNH0GvNTCsmHGiWFn5izYGyp7llyAv Q==; X-IronPort-AV: E=Sophos;i="6.01,202,1684825200"; d="scan'208";a="222827123" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa3.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 13 Jul 2023 05:12:33 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Thu, 13 Jul 2023 05:12:32 -0700 Received: from wendy.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.21 via Frontend Transport; Thu, 13 Jul 2023 05:12:30 -0700 From: Conor Dooley To: CC: , , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Albert Ou , "Jonathan Corbet" , Andrew Jones , "Heiko Stuebner" , Evan Green , Sunil V L , , , , , Palmer Dabbelt Subject: [PATCH v5 01/11] RISC-V: Provide a more helpful error message on invalid ISA strings Date: Thu, 13 Jul 2023 13:10:59 +0100 Message-ID: <20230713-endless-spearhead-62a5a4b149bd@wendy> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230713-target-much-8ac624e90df8@wendy> References: <20230713-target-much-8ac624e90df8@wendy> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2940; i=conor.dooley@microchip.com; h=from:subject:message-id; bh=9vL9UTnWKFum0JN16SUa6SYVYB7LNXsYDcHCgjUs78g=; b=owGbwMvMwCFWscWwfUFT0iXG02pJDCnrX15Z31TaJ2s3lzevTmmnneHM8n8OFz29fLJ2NilFflF6 0dTfUcrCIMbBICumyJJ4u69Fav0flx3OPW9h5rAygQxh4OIUgIk0JjMyTJq7/uiLtIVfulw33u7gdz Y+9vaU1blLHYKHuE7xSXvnTmb4X/TmkU8MT8yU/W7nJs9b/fe2mNCBZYz5vOtP82QxR3kJsAIA X-Developer-Key: i=conor.dooley@microchip.com; a=openpgp; fpr=F9ECA03CF54F12CD01F1655722E2C55B37CF380C Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Palmer Dabbelt Right now we provide a somewhat unhelpful error message on systems with invalid error messages, something along the lines of CPU with hartid=3D0 is not available ------------[ cut here ]------------ kernel BUG at arch/riscv/kernel/smpboot.c:174! Kernel BUG [#1] Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 6.4.0-rc1-00096-ge0097d2c62d5-dirt= y #1 Hardware name: Microchip PolarFire-SoC Icicle Kit (DT) epc : of_parse_and_init_cpus+0x16c/0x16e ra : of_parse_and_init_cpus+0x9a/0x16e epc : ffffffff80c04e0a ra : ffffffff80c04d38 sp : ffffffff81603e20 gp : ffffffff8182d658 tp : ffffffff81613f80 t0 : 000000000000006e t1 : 0000000000000064 t2 : 0000000000000000 s0 : ffffffff81603e80 s1 : 0000000000000000 a0 : 0000000000000000 a1 : 0000000000000000 a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000 a5 : 0000000000001fff a6 : 0000000000001fff a7 : ffffffff816148b0 s2 : 0000000000000001 s3 : ffffffff81492a4c s4 : ffffffff81a4b090 s5 : ffffffff81506030 s6 : 0000000000000040 s7 : 0000000000000000 s8 : 00000000bfb6f046 s9 : 0000000000000001 s10: 0000000000000000 s11: 00000000bf389700 t3 : 0000000000000000 t4 : 0000000000000000 t5 : ffffffff824dd188 t6 : ffffffff824dd187 status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003 [] of_parse_and_init_cpus+0x16c/0x16e [] setup_smp+0x1e/0x26 [] setup_arch+0x6e/0xb2 [] start_kernel+0x72/0x400 Code: 80e7 4a00 a603 0009 b795 1097 ffe5 80e7 92c0 9002 (9002) 715d ---[ end trace 0000000000000000 ]--- Kernel panic - not syncing: Fatal exception in interrupt Add a warning for the cases where the ISA string isn't valid. It's still above the BUG_ON cut, but hopefully it's at least a bit easier for users. Signed-off-by: Palmer Dabbelt Reviewed-by: Evan Green Reviewed-by: Andrew Jones Signed-off-by: Conor Dooley --- arch/riscv/kernel/cpu.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c index a2fc952318e9..3af2d214ce21 100644 --- a/arch/riscv/kernel/cpu.c +++ b/arch/riscv/kernel/cpu.c @@ -66,11 +66,15 @@ int riscv_early_of_processor_hartid(struct device_node = *node, unsigned long *har return -ENODEV; } =20 - if (IS_ENABLED(CONFIG_32BIT) && strncasecmp(isa, "rv32ima", 7)) + if (IS_ENABLED(CONFIG_32BIT) && strncasecmp(isa, "rv32ima", 7)) { + pr_warn("CPU with hartid=3D%lu does not support rv32ima", *hart); return -ENODEV; + } =20 - if (IS_ENABLED(CONFIG_64BIT) && strncasecmp(isa, "rv64ima", 7)) + if (IS_ENABLED(CONFIG_64BIT) && strncasecmp(isa, "rv64ima", 7)) { + pr_warn("CPU with hartid=3D%lu does not support rv64ima", *hart); return -ENODEV; + } =20 return 0; } --=20 2.40.1