From nobody Sat Feb 7 15:59:18 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 321F9C636BD for ; Fri, 24 Nov 2023 07:11:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231922AbjKXHKu (ORCPT ); Fri, 24 Nov 2023 02:10:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44468 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344572AbjKXHKf (ORCPT ); Fri, 24 Nov 2023 02:10:35 -0500 Received: from mail-ot1-x330.google.com (mail-ot1-x330.google.com [IPv6:2607:f8b0:4864:20::330]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E7AD10F8 for ; Thu, 23 Nov 2023 23:10:41 -0800 (PST) Received: by mail-ot1-x330.google.com with SMTP id 46e09a7af769-6cd0963c61cso886212a34.0 for ; Thu, 23 Nov 2023 23:10:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1700809841; x=1701414641; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5e69UQ6T+Z7CNLXUZDcGOS0SOuMoPgQwIsqXvR77gEM=; b=KgA9XAS8b7ne4H2F86yT9mlby7sXhpU4oQ9fnCaHFw6aKqBDgbiJYw2LwBPCr9lMcT WU2D71DWa2/4i8sourHqU280RsyMYu2bj6i4rRD4ysNe9eWt5qzdYxM6rCqJ9ifD3jas smoimi5b5z2LjnMehSKbX9eDX2xNaqn6R5oc2bOYhHTihq85mRxtQ/w1CwLB20piSmTN YeLpZNueQPwMUAyJW5wBhFsDJTFAZNASVwN7Ay1Hjl/iYsowro22NZD2pVrIm5XZ2cJr pVxitvfAIZ/rqNBwZJkwd35kzkR15P35eW3krXB2Bd4BOG/g5f1wLMB/LflXalWAI7JI V+Dg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700809841; x=1701414641; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5e69UQ6T+Z7CNLXUZDcGOS0SOuMoPgQwIsqXvR77gEM=; b=Yfep/BakqvuqhvFba1qMMIgCsckKFnv/1bDdCpRuuKsavaji7aqA6piMhvbWkOSVG8 JhuLoMScQM+RlvBfs9yVmnYavRQp2kVFp3pBeu1DaBqblQp+VeGZDNIGJyQEoiG0Djxl WYLnJGJrqFkzk5rQWAV4t5u7ddaie+8l4kBZoWin0jOIq85Cn7EFN5Mt1n07SUAZGF0n 981YT7UxL5fDl6vswKUhjEZhtCLJ8znQClk2W//9Qmx5P/ukezDHc3IaTzJTxb4zT0+h 8mPoyEEs02Jj5zHDVeNS2Pv1bGi80WSFp1okP3F3QTGhmGPhe/YQu/WJsla2Sh3rcfvO Gmnw== X-Gm-Message-State: AOJu0Yyhr52cu9dRxSO8Eh7QrvORmiJMZ3S7/T0fT/qsNvaAmO6WtYJg tTBPJ8vMQY2QaEPiQTme+k065w== X-Google-Smtp-Source: AGHT+IGpCaOs051rva99tydJYiLxp2JmCAggGxrs3iHMIIeR5K0qZKOeN66AGmBC8Za809GQ8lm4oQ== X-Received: by 2002:a05:6871:453:b0:1f4:dd99:b07 with SMTP id e19-20020a056871045300b001f4dd990b07mr2011442oag.49.1700809840700; Thu, 23 Nov 2023 23:10:40 -0800 (PST) Received: from localhost.localdomain ([106.51.83.242]) by smtp.gmail.com with ESMTPSA id e5-20020a9d7305000000b006c61c098d38sm435532otk.21.2023.11.23.23.10.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Nov 2023 23:10:40 -0800 (PST) From: Anup Patel To: Palmer Dabbelt , Paul Walmsley , Greg Kroah-Hartman , Jiri Slaby Cc: Conor Dooley , Andrew Jones , linux-riscv@lists.infradead.org, linux-serial@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Atish Patra , Anup Patel Subject: [PATCH v5 4/5] tty: Add SBI debug console support to HVC SBI driver Date: Fri, 24 Nov 2023 12:39:04 +0530 Message-Id: <20231124070905.1043092-5-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231124070905.1043092-1-apatel@ventanamicro.com> References: <20231124070905.1043092-1-apatel@ventanamicro.com> MIME-Version: 1.0 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: Atish Patra RISC-V SBI specification supports advanced debug console support via SBI DBCN extension. Extend the HVC SBI driver to support it. Signed-off-by: Atish Patra Signed-off-by: Anup Patel --- drivers/tty/hvc/Kconfig | 2 +- drivers/tty/hvc/hvc_riscv_sbi.c | 37 ++++++++++++++++++++++++++------- 2 files changed, 31 insertions(+), 8 deletions(-) diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig index 4f9264d005c0..6e05c5c7bca1 100644 --- a/drivers/tty/hvc/Kconfig +++ b/drivers/tty/hvc/Kconfig @@ -108,7 +108,7 @@ config HVC_DCC_SERIALIZE_SMP =20 config HVC_RISCV_SBI bool "RISC-V SBI console support" - depends on RISCV_SBI_V01 + depends on RISCV_SBI select HVC_DRIVER help This enables support for console output via RISC-V SBI calls, which diff --git a/drivers/tty/hvc/hvc_riscv_sbi.c b/drivers/tty/hvc/hvc_riscv_sb= i.c index 31f53fa77e4a..2f3571f17ecd 100644 --- a/drivers/tty/hvc/hvc_riscv_sbi.c +++ b/drivers/tty/hvc/hvc_riscv_sbi.c @@ -39,21 +39,44 @@ static int hvc_sbi_tty_get(uint32_t vtermno, char *buf,= int count) return i; } =20 -static const struct hv_ops hvc_sbi_ops =3D { +static const struct hv_ops hvc_sbi_v01_ops =3D { .get_chars =3D hvc_sbi_tty_get, .put_chars =3D hvc_sbi_tty_put, }; =20 -static int __init hvc_sbi_init(void) +static int hvc_sbi_dbcn_tty_put(uint32_t vtermno, const char *buf, int cou= nt) { - return PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_ops, 16)); + return sbi_debug_console_write(buf, count); } -device_initcall(hvc_sbi_init); =20 -static int __init hvc_sbi_console_init(void) +static int hvc_sbi_dbcn_tty_get(uint32_t vtermno, char *buf, int count) { - hvc_instantiate(0, 0, &hvc_sbi_ops); + return sbi_debug_console_read(buf, count); +} + +static const struct hv_ops hvc_sbi_dbcn_ops =3D { + .put_chars =3D hvc_sbi_dbcn_tty_put, + .get_chars =3D hvc_sbi_dbcn_tty_get, +}; + +static int __init hvc_sbi_init(void) +{ + int err; + + if (sbi_debug_console_available) { + err =3D PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_dbcn_ops, 256)); + if (err) + return err; + hvc_instantiate(0, 0, &hvc_sbi_dbcn_ops); + } else if (IS_ENABLED(CONFIG_RISCV_SBI_V01)) { + err =3D PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_v01_ops, 256)); + if (err) + return err; + hvc_instantiate(0, 0, &hvc_sbi_v01_ops); + } else { + return -ENODEV; + } =20 return 0; } -console_initcall(hvc_sbi_console_init); +device_initcall(hvc_sbi_init); --=20 2.34.1