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[2403:580b:97e8:0:82ce:f179:8a79:69f4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21105707064sm3022795ad.70.2024.10.30.20.54.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Oct 2024 20:54:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1730346848; x=1730951648; 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=aECLQYoFa6jL11vXtmcyRzHRyOWnIrCCQVCMGwmJA+M=; b=CTuSX0T8Y9Q9kfqSpGqmaBZpUk2zeTIbduBkFs3Epkz8DHh9zyZGbWgEtObXeIQpsX Pruf5EjjQifoYnV0kJ7BMZJ8Y38n6Ol5rBXP+o9Bhnx1MQl8s2B1KDWxPjj48BAnuZAT YvsIo6rreB5l6sDXW7/Z83uORZuHbmWtbLMwOOn12bASc1qJv3/rCODLJrAa4ozmqqC1 EU9jHgSGfXqcV+9VJoqVdyvoWIDCsicQtpmBgDEUsk8sF/NDTQT/UeEBmDnhR2+DUoj4 +R26mWH9BhR9hW0KaF0IVEqQNUvk72qNq+4prdHr4yBIumSXGTZereODLFhuWJD0MkxC xnTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730346848; x=1730951648; 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=aECLQYoFa6jL11vXtmcyRzHRyOWnIrCCQVCMGwmJA+M=; b=dTGMzvL6tqeGWT2mqlOhTeLHRs9w/RRlz1WA7pRzXGr7v8/NgUWeQJX+CpXkdtncFl Z/bD1s+Pe8WLqpqgkAdOZvFRsRm79Ia5KCj8+IEy/vN0+c1Vx2FMLlZJYT2brR/UXXa3 ujzCxbDBZiD038ylFKHt/19LH1basynEkZli+sYDeL7fgM4yCwz4Rf8OflR0CPAjSR6i B3oLtzkeAbXEG64VeXl8s5x9oDXWzXy4lIzTvj6NqyDgOVJ8pa92TnqrEjS3XFxMSwgI L7BvZZZ6xzO+VmlshoC0aKfBYkHrMNjuF7I448FX8vCGKX/dTsAT83rQWyg/DmcYbGWJ A24Q== X-Gm-Message-State: AOJu0YyScYvEynJkYbHp2Y7jkK4Gl03G3yPtAXTEY0++94GGg2gkOsNR b0C1J2x2ymfY/5XD5DpiKgwDt3sNJLLN4LO/rQlYMKpQ+G1+Lan5SXs2+GW2 X-Google-Smtp-Source: AGHT+IGGJ+LrXXl1kj3QmXcEAwBF7AtJncdMumGMQkTQzNLmYGTNYxOUvRHsgOM00sN7i+5kLs9hbA== X-Received: by 2002:a17:903:2a84:b0:207:4c7c:743b with SMTP id d9443c01a7336-211039ecf51mr26714795ad.0.1730346848614; Wed, 30 Oct 2024 20:54:08 -0700 (PDT) From: Alistair Francis X-Google-Original-From: Alistair Francis To: qemu-devel@nongnu.org Cc: alistair23@gmail.com, Alistair Francis , Daniel Henrique Barboza , Thomas Huth , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PULL 14/50] hw/char: riscv_htif: Use blocking qemu_chr_fe_write_all Date: Thu, 31 Oct 2024 13:52:42 +1000 Message-ID: <20241031035319.731906-15-alistair.francis@wdc.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241031035319.731906-1-alistair.francis@wdc.com> References: <20241031035319.731906-1-alistair.francis@wdc.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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::632; envelope-from=alistair23@gmail.com; helo=mail-pl1-x632.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 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 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: 1730346980556116600 The current approach of using qemu_chr_fe_write() and ignoring the return values results in dropped characters [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 characters. 1: https://gitlab.com/qemu-project/qemu/-/issues/2114 Signed-off-by: Alistair Francis Reviewed-by: Daniel Henrique Barboza Reviewed-by: Thomas Huth Reviewed-by: Philippe Mathieu-Daud=C3=A9 Message-ID: <20240910045419.1252277-2-alistair.francis@wdc.com> Signed-off-by: Alistair Francis --- 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 54fd55c3e6..0345088e8b 100644 --- a/hw/char/riscv_htif.c +++ b/hw/char/riscv_htif.c @@ -217,7 +217,11 @@ 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, @@ -236,7 +240,11 @@ 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 2.47.0