From nobody Tue Feb 10 12:58:55 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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 ARC-Seal: i=1; a=rsa-sha256; t=1617263548; cv=none; d=zohomail.com; s=zohoarc; b=mKtlay6VAEYkvGC1AWYYvTmo0c7YONVQYRFLj4c38M417rn/uFg98jje0BBpbSE+E6KNvSD0GtzxkoFRF1kq1qxhs79PefpX95O0VKcpbZLboFJrT9DNgZAePJjp6ngpq9zkvlYxfzIFqt9/TJaYHmteGbVpzD/RFn1UMimg0K8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1617263548; h=Content-Transfer-Encoding:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=hhcAfUw037WO+Hk8ljfAaZ7ulFJXNCNT+SN4S1slMTA=; b=jdNcZJ8KHXtBmIvSJGwVJnaWP7gb/qSocGBVduo//AxVml/rvS0Ta13WEfJqkTUdfPpRPaC5ByThHsjW7CNR9NkhVIV8nWSQL/X7Ec5UW0e8iuvm8KnntSvW2hDO7plKxFwfNu7upY2lG+64oOvwuTeYPJQ1XCOQDgweNwPwvdY= ARC-Authentication-Results: i=1; mx.zohomail.com; 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 161726354877914.799198810337089; Thu, 1 Apr 2021 00:52:28 -0700 (PDT) Received: from localhost ([::1]:40376 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lRs7u-000148-7I for importer@patchew.org; Thu, 01 Apr 2021 03:52:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56946) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lRs5W-0005Lp-Gt for qemu-devel@nongnu.org; Thu, 01 Apr 2021 03:49:58 -0400 Received: from mail.ilande.co.uk ([2001:41c9:1:41f::167]:57008 helo=mail.default.ilande.uk0.bigv.io) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lRs5V-0000kR-2W for qemu-devel@nongnu.org; Thu, 01 Apr 2021 03:49:58 -0400 Received: from host86-148-103-9.range86-148.btcentralplus.com ([86.148.103.9] helo=kentang.home) by mail.default.ilande.uk0.bigv.io with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lRs5Z-0004IO-8s; Thu, 01 Apr 2021 08:50:07 +0100 From: Mark Cave-Ayland To: qemu-devel@nongnu.org, alxndr@bu.edu, laurent@vivier.eu, pbonzini@redhat.com Date: Thu, 1 Apr 2021 08:49:24 +0100 Message-Id: <20210401074933.9923-3-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210401074933.9923-1-mark.cave-ayland@ilande.co.uk> References: <20210401074933.9923-1-mark.cave-ayland@ilande.co.uk> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 86.148.103.9 X-SA-Exim-Mail-From: mark.cave-ayland@ilande.co.uk Subject: [PATCH v3 02/11] esp: rework write_response() to avoid using the FIFO for DMA transactions X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.default.ilande.uk0.bigv.io) 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=2001:41c9:1:41f::167; envelope-from=mark.cave-ayland@ilande.co.uk; helo=mail.default.ilande.uk0.bigv.io 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, 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: 2.1.23 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" Content-Type: text/plain; charset="utf-8" The code for write_response() has always used the FIFO to store the data for the status/message in phases, even for DMA transactions. Switch to using a separate buffer that can be used directly for DMA transactions and restrict the FIFO use to the non-DMA case. Signed-off-by: Mark Cave-Ayland Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/scsi/esp.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index bafea0d4e6..26fe1dcb9d 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -445,18 +445,16 @@ static void write_response_pdma_cb(ESPState *s) =20 static void write_response(ESPState *s) { - uint32_t n; + uint8_t buf[2]; =20 trace_esp_write_response(s->status); =20 - fifo8_reset(&s->fifo); - esp_fifo_push(s, s->status); - esp_fifo_push(s, 0); + buf[0] =3D s->status; + buf[1] =3D 0; =20 if (s->dma) { if (s->dma_memory_write) { - s->dma_memory_write(s->dma_opaque, - (uint8_t *)fifo8_pop_buf(&s->fifo, 2, &n),= 2); + s->dma_memory_write(s->dma_opaque, buf, 2); s->rregs[ESP_RSTAT] =3D STAT_TC | STAT_ST; s->rregs[ESP_RINTR] |=3D INTR_BS | INTR_FC; s->rregs[ESP_RSEQ] =3D SEQ_CD; @@ -466,7 +464,8 @@ static void write_response(ESPState *s) return; } } else { - s->ti_size =3D 2; + fifo8_reset(&s->fifo); + fifo8_push_all(&s->fifo, buf, 2); s->rregs[ESP_RFLAGS] =3D 2; } esp_raise_irq(s); --=20 2.20.1