From patchwork Fri Oct 20 07:21:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 13430168 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 AB41EC07480 for ; Fri, 20 Oct 2023 07:22:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376503AbjJTHWr (ORCPT ); Fri, 20 Oct 2023 03:22:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376514AbjJTHW3 (ORCPT ); Fri, 20 Oct 2023 03:22:29 -0400 Received: from mail-oi1-x22a.google.com (mail-oi1-x22a.google.com [IPv6:2607:f8b0:4864:20::22a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C88BC171C for ; Fri, 20 Oct 2023 00:22:22 -0700 (PDT) Received: by mail-oi1-x22a.google.com with SMTP id 5614622812f47-3b2ec9a79bdso379790b6e.3 for ; Fri, 20 Oct 2023 00:22:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697786542; x=1698391342; 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=y40VDpa5tFn1F2iuJCGX0eAdf56bF4H2v7CDU5J7JlM=; b=Y/dSv7M87ohdmZ4awy0HHKLeA+scxM7mt0K3NdBG6B7PFHtFqgnuE5MD8/oAVDJwbP oYhoDehf1vfzRuNR2JBJatfKHKmrs/7Px/ImZpPIYO7q1/2JZI+tHFbFQ8aLcVT4ShOg HdkKk8JMTSOd/kDrEvdPWrTHf/VS0wkP1s9/qX/Dl2mae+8xJ6w2s91cGLE1pzAY/dMN LVTmx5+PGF3DCSSMvqqnSf3CD4TdcDp+8xoB63mSrSiiI5MepK5YpxBWPGXE+SoAsiaQ 1bvuV3UjZHF3/WoE5reUxLbIwjGDgvhEcEQAQ58K3JRfQJueyvr9zfmpJXJlPo6bJcKC /c/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697786542; x=1698391342; 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=y40VDpa5tFn1F2iuJCGX0eAdf56bF4H2v7CDU5J7JlM=; b=uY7ocfkk/nSObpD0zybZ8A2sOxCfW0GWw0M8GUOgbnK84GzepC4TUgQP2VCtDD7Bi7 GQ1w1KfNJZ8IsjoPOCtdX8T/1tVMvzqJiu5fouUjKlFESkTupByM+h4DzJ2DX6l92i/t CEftkW9Txp8b1jqivbA6JXCsVmesN0bYKPZZAid3/hVfcwWguqjII0iO2palf4meYIfo vpvSWdcN4QZffUJlg+Hi92CQ4kbSXOZIDvWKJBUKOSf5MfxXMofY09QZXo7l1Vc4A4Re vfr7KliClgrD0uYxT8LjNy7KuozRZYbBtzJ5Etb3u6YlZSmywe3IC5/B50kWFth8M1fy 4y4Q== X-Gm-Message-State: AOJu0YxtjIZXESOjZIuv+bOu9FD3m+KUP0DU0bkpNs+gndMGHCCevD7b jJFK/rwLQmrTruSl51Ri5MFyCQ4QxrYd9n6IZo0= X-Google-Smtp-Source: AGHT+IEUQYK4G0+aPnRjUR077ELz4RoscN7PlFXPrhd3l1/3Dp5w/UYmiQBCTNoQsdXF4g9TKR4q0g== X-Received: by 2002:a05:6808:55:b0:3af:d7dc:a47e with SMTP id v21-20020a056808005500b003afd7dca47emr1067018oic.42.1697786541699; Fri, 20 Oct 2023 00:22:21 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.22.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:22:21 -0700 (PDT) From: Anup Patel To: Paolo Bonzini , Atish Patra , Palmer Dabbelt , Paul Walmsley , Greg Kroah-Hartman , Jiri Slaby Cc: Conor Dooley , Andrew Jones , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-serial@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v3 7/9] tty/serial: Add RISC-V SBI debug console based earlycon Date: Fri, 20 Oct 2023 12:51:38 +0530 Message-Id: <20231020072140.900967-8-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-apatel@ventanamicro.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org We extend the existing RISC-V SBI earlycon support to use the new RISC-V SBI debug console extension. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- drivers/tty/serial/Kconfig | 2 +- drivers/tty/serial/earlycon-riscv-sbi.c | 32 +++++++++++++++++++++---- 2 files changed, 29 insertions(+), 5 deletions(-) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index bdc568a4ab66..cec46091a716 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -87,7 +87,7 @@ config SERIAL_EARLYCON_SEMIHOST config SERIAL_EARLYCON_RISCV_SBI bool "Early console using RISC-V SBI" - depends on RISCV_SBI_V01 + depends on RISCV_SBI select SERIAL_CORE select SERIAL_CORE_CONSOLE select SERIAL_EARLYCON diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c index 27afb0b74ea7..c21cdef254e7 100644 --- a/drivers/tty/serial/earlycon-riscv-sbi.c +++ b/drivers/tty/serial/earlycon-riscv-sbi.c @@ -15,17 +15,41 @@ static void sbi_putc(struct uart_port *port, unsigned char c) sbi_console_putchar(c); } -static void sbi_console_write(struct console *con, - const char *s, unsigned n) +static void sbi_0_1_console_write(struct console *con, + const char *s, unsigned int n) { struct earlycon_device *dev = con->data; uart_console_write(&dev->port, s, n, sbi_putc); } +static void sbi_dbcn_console_write(struct console *con, + const char *s, unsigned int n) +{ + phys_addr_t pa = __pa(s); + + if (IS_ENABLED(CONFIG_32BIT)) + sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, + n, lower_32_bits(pa), upper_32_bits(pa), 0, 0, 0); + else + sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, + n, pa, 0, 0, 0, 0); +} + static int __init early_sbi_setup(struct earlycon_device *device, const char *opt) { - device->con->write = sbi_console_write; - return 0; + int ret = 0; + + if ((sbi_spec_version >= sbi_mk_version(2, 0)) && + (sbi_probe_extension(SBI_EXT_DBCN) > 0)) { + device->con->write = sbi_dbcn_console_write; + } else { + if (IS_ENABLED(CONFIG_RISCV_SBI_V01)) + device->con->write = sbi_0_1_console_write; + else + ret = -ENODEV; + } + + return ret; } EARLYCON_DECLARE(sbi, early_sbi_setup);