From nobody Sun Nov 24 12:11:57 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1723686904; cv=none; d=zohomail.com; s=zohoarc; b=gNtdNsp18DWznsbZwEKnGoQC8SvV+z3GbMmNDXytzk3UJhWIj1U6fRnDe5Os9bgqfqxUKGNTY5AJgCiIBjepb30oibWcggQmmhiyJlnNYwSBIRSFh79elzlluyK4wjCynX2AcA1yOxQLUkE0uwKfK7ThUkBUZE9agw3xPzgDkxc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1723686904; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=DUCMHPp07k4dvdcPQu5lMZBREYWJ6ieRcJ5oeGbqTms=; b=cgDhWjXDkPnrDvHgBWwW2x5kS29/luZPShGRW/BYpoeWIMMmqe0iZOIC5+NFPbKdKbgwF/406atPFNI0HPDEJ3ND7csP0fX38VX7PqymjXMMmKGJFq6/fpo8OS7sW4J6JIV+sWRBDXUqCq3zVmUBCgIumQW6XuP40xEPV8cGaBE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1723686904720777.1226167924068; Wed, 14 Aug 2024 18:55:04 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sePhF-0005V5-VD; Wed, 14 Aug 2024 21:54:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sePh8-0005NM-Ra; Wed, 14 Aug 2024 21:54:31 -0400 Received: from mail-pj1-x1036.google.com ([2607:f8b0:4864:20::1036]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sePh6-0003la-W7; Wed, 14 Aug 2024 21:54:30 -0400 Received: by mail-pj1-x1036.google.com with SMTP id 98e67ed59e1d1-2cd5d6b2581so328825a91.2; Wed, 14 Aug 2024 18:54:27 -0700 (PDT) Received: from toolbox.alistair23.me (2403-580b-97e8-0-82ce-f179-8a79-69f4.ip6.aussiebb.net. [2403:580b:97e8:0:82ce:f179:8a79:69f4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2d396a59287sm2477688a91.0.2024.08.14.18.54.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Aug 2024 18:54:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1723686866; x=1724291666; darn=nongnu.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=DUCMHPp07k4dvdcPQu5lMZBREYWJ6ieRcJ5oeGbqTms=; b=PdCU3USff2o1vExOiGJgzJ/isiFyrOqdSDHBCvSljI2N2mIuOI1P2Adx1lh6CjFwsa 4za85tB0mkvQoBOA+jVjmCCQtCGPGPxvpNtUkoWmc3cBE9+lseCxERwmVL2tJfM4FA16 HPNwIKj668tZSY5mPEYnG3C/1kScJM6EYtd/XU/OrU0w038loppENmuVHnoVfKig6Xw+ 3Q1GpeYcR5rAk62LrYP1Sc1dWsE8H8VvIOZ45dB7om7FPHxMXQ+duvOd9RQDT0AkACTx Buse/PI+YoDLX6+f5I+VuIJ8VsKyxguTBcPU7N2P3RXOv0PQFuB2J7Ss4zMFZrUX5mn4 TtEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723686866; x=1724291666; 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=DUCMHPp07k4dvdcPQu5lMZBREYWJ6ieRcJ5oeGbqTms=; b=Joo67bvBNsxlnNbJcW4P30E65vlXGNXeAHyb5Q7Kmy9JV8wOc2ezs8bCTPamTyaH7w rIM3Y7hYJ+UIL2/0reMnQtl42QrguYwJS9if7gRGzS1UNZNjipIQiQqyaGLpxLeo1IzM ZkvAzkJNz4uHtRxGpe1qj69wyrfZFdek71h23Tvx1eFba/vaTs8r5Fb9G6NtjsiVWkhR hlulwQIuydChc0O4VtluMqa9N2n4e94AEgKDMxZRmv57uQSh/TuZRQVUYz0mTHS4k39d Y2DCqK3z8VtiLBll8O/EFLbQBIJox5ySjQqpBZ5FRsvNQLcOpdt64HD8WW/2vp92eYUL F5WA== X-Forwarded-Encrypted: i=1; AJvYcCVxeM/e4gVIpDRSpHUJHawTEa5EfXQC3/LIIsYx1lzikdV6yo9CA+a8HhboSM2Umnosg3SSpOFCCqc7OkgqrS4VJ7/oq39HqygbOkZEU7sGUhy5ciTjkdw6O3r/1Q== X-Gm-Message-State: AOJu0Yx7SrzfVAicCWcBnZyZOi4xuMTKcftBrfnYNZHgK9AkWZa3DTGd S9KnTNXl5DYzjSoze8xa9kAHgWx7KBZOxTHNzr2cXKgvq0hWFVIMSKgqbA== X-Google-Smtp-Source: AGHT+IFbUvGY8XDCMtEcLPXd/qbZH+O5ifETchpqHujU41urwQ2Pm0W7NId2cPVk4knAipSxFTIUug== X-Received: by 2002:a17:90a:c8c:b0:2cb:4e14:fd5d with SMTP id 98e67ed59e1d1-2d3aaa9cffamr5227352a91.17.1723686865951; Wed, 14 Aug 2024 18:54:25 -0700 (PDT) From: Alistair Francis X-Google-Original-From: Alistair Francis To: alex.bennee@linaro.org, qemu-devel@nongnu.org, peter.maydell@linaro.org Cc: alistair23@gmail.com, dbarboza@ventanamicro.com, palmer@dabbelt.com, qemu-riscv@nongnu.org, =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , zhiwei_liu@linux.alibaba.com, atishp@rivosinc.com, Bin Meng , liwei1518@gmail.com, Alistair Francis , Paolo Bonzini , Alistair Francis Subject: [PATCH 1/2] hw/char: riscv_htif: Use blocking qemu_chr_fe_write_all Date: Thu, 15 Aug 2024 11:54:09 +1000 Message-ID: <20240815015410.369925-2-alistair.francis@wdc.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240815015410.369925-1-alistair.francis@wdc.com> References: <20240815015410.369925-1-alistair.francis@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::1036; envelope-from=alistair23@gmail.com; helo=mail-pj1-x1036.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1723686905985116600 Content-Type: text/plain; charset="utf-8" The current approach of using qemu_chr_fe_write() and ignoring the return values results in dropped charecters [1]. Ideally we want to report FIFO status to the guest, but the HTIF isn't a real UART, so we don't really have a way to do that. Instead let's just use qemu_chr_fe_write_all() so at least we don't drop charecters. 1: https://gitlab.com/qemu-project/qemu/-/issues/2114 Signed-off-by: Alistair Francis Reviewed-by: Daniel Henrique Barboza --- hw/char/riscv_htif.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/hw/char/riscv_htif.c b/hw/char/riscv_htif.c index 9bef60def1..d40b542948 100644 --- a/hw/char/riscv_htif.c +++ b/hw/char/riscv_htif.c @@ -218,7 +218,11 @@ static void htif_handle_tohost_write(HTIFState *s, uin= t64_t val_written) tswap64(syscall[3]) =3D=3D HTIF_CONSOLE_CMD_PUTC) { uint8_t ch; cpu_physical_memory_read(tswap64(syscall[2]), &ch, 1); - qemu_chr_fe_write(&s->chr, &ch, 1); + /* + * XXX this blocks entire thread. Rewrite to use + * qemu_chr_fe_write and background I/O callbacks + */ + qemu_chr_fe_write_all(&s->chr, &ch, 1); resp =3D 0x100 | (uint8_t)payload; } else { qemu_log_mask(LOG_UNIMP, @@ -237,7 +241,11 @@ static void htif_handle_tohost_write(HTIFState *s, uin= t64_t val_written) return; } else if (cmd =3D=3D HTIF_CONSOLE_CMD_PUTC) { uint8_t ch =3D (uint8_t)payload; - qemu_chr_fe_write(&s->chr, &ch, 1); + /* + * XXX this blocks entire thread. Rewrite to use + * qemu_chr_fe_write and background I/O callbacks + */ + qemu_chr_fe_write_all(&s->chr, &ch, 1); resp =3D 0x100 | (uint8_t)payload; } else { qemu_log("HTIF device %d: unknown command\n", device); --=20 2.46.0