From nobody Sat Sep 21 08:43:13 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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=fail(p=none dis=none) header.from=ilande.co.uk Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1705064210890372.8324261591629; Fri, 12 Jan 2024 04:56:50 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rOH5W-0002gN-0P; Fri, 12 Jan 2024 07:56:42 -0500 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 1rOH5T-0002S7-Rw for qemu-devel@nongnu.org; Fri, 12 Jan 2024 07:56:39 -0500 Received: from mail.ilande.co.uk ([2001:41c9:1:41f::167]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rOH5I-0007S2-TZ for qemu-devel@nongnu.org; Fri, 12 Jan 2024 07:56:31 -0500 Received: from [2a02:8012:c93d:0:260e:bf57:a4e9:8142] (helo=cheesecake.fritz.box) by mail.ilande.co.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rOH4U-0008jM-Ry; Fri, 12 Jan 2024 12:55:42 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=ilande.co.uk; s=20220518; h=Subject:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:To:From:Sender:Reply-To:Cc: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=vhGa8G/D4xOpLPY1j1zK4i3OsOVDrN1vRe9nfcMuvuk=; b=irMYkNFD1YCImcRzKqyziekCMS 6NAstoZ6Eyx7UixR/2AnbfjQD1f0K8EEwGN6SRWbuw1kPd51f/3cwXDiETR1FQQtdaoTF0PABqFCY tqvqkAaJ65FkjYjsjyhZgL5zNnX1P0veA9sWr5zAk/ignfPI3W9ZwAVZVGtut9etFSz4zj51tJg/g 3d/Hepp56TlAcI7nS6DYsgjSH4OIGpSKq2tZd8lCSXmZVK3WEnaU6U0EGXQrMHvz8cv/AB72syMHN cfj2crqP4ufwE0z+r6Bxbslnp05j+aFyOeK5KZtjVV1GIqV432FVv4JeECkAGC0NYF34DkAXYg6+D apvXd80uz9phEM6K+6P3T+DlnbZhCslQGB13OQ7oR+LxVnLZBAmUj/EA7b7sDCyoit8bRHJ95LEr8 Cxi/qep1r9bdOmv3UGJKbqZkH+Nl9RkDrB3lswyPC4h8UKNikyic13hoRJ4c4FeFDBbqK25A0KJgf J9QeJ+PGg2fEFgNTojY4oyct/sYo/XS2kuG/JdYL/qZmkYjjxjKZsUthIB8kYwuhgAT0dH3oNncNe 42nid4bjwyDTdI7bHp+9EzOE7q6lD0n0LCAeiVCINFUViqeiBy1QNfRA+k42hS4N/hbmsDgGIIdGd FPum+4kzBs9Y+JhbF937nldJ2UaH1HhMzgPCLZZt4=; From: Mark Cave-Ayland To: pbonzini@redhat.com, fam@euphon.net, hpoussin@reactos.org, laurent@vivier.eu, thuth@redhat.com, qemu-devel@nongnu.org Date: Fri, 12 Jan 2024 12:53:20 +0000 Message-Id: <20240112125420.514425-29-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240112125420.514425-1-mark.cave-ayland@ilande.co.uk> References: <20240112125420.514425-1-mark.cave-ayland@ilande.co.uk> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 2a02:8012:c93d:0:260e:bf57:a4e9:8142 X-SA-Exim-Mail-From: mark.cave-ayland@ilande.co.uk Subject: [PATCH 28/88] esp.c: consolidate async_len and TC == 0 checks in do_dma_pdma_cb() and esp_do_dma() X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.ilande.co.uk) 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.ilande.co.uk X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, 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: fail (Header signature does not verify) X-ZM-MESSAGEID: 1705064212785100007 Content-Type: text/plain; charset="utf-8" Ensure that the async_len checks for requesting data from the SCSI layer and the TC =3D=3D 0 checks to detect the end of the DMA transfer are consistent= in both do_dma_pdma_cb() and esp_do_dma(). In particular this involves adding the c= heck to see if the FIFO is at its low threshold since PDMA and mixed DMA and non= -DMA requests can leave data remaining in the FIFO. At the same time update all the comments so that they are also consistent b= etween all similar code paths. Signed-off-by: Mark Cave-Ayland --- hw/scsi/esp.c | 44 +++++++++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 13 deletions(-) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 6b0811d3ce..f20026c3dc 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -604,12 +604,13 @@ static void do_dma_pdma_cb(ESPState *s) s->async_len -=3D n; s->ti_size +=3D n; =20 - if (s->async_len =3D=3D 0) { + if (s->async_len =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { + /* Defer until the scsi layer has completed */ scsi_req_continue(s->current_req); return; } =20 - if (esp_get_tc(s) =3D=3D 0) { + if (esp_get_tc(s) =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { esp_lower_drq(s); esp_dma_done(s); } @@ -706,24 +707,30 @@ static void esp_do_dma(ESPState *s) s->async_len -=3D len; s->ti_size +=3D len; =20 - if (s->async_len =3D=3D 0) { + if (s->async_len =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { + /* Defer until the scsi layer has completed */ scsi_req_continue(s->current_req); - /* - * If there is still data to be read from the device then - * complete the DMA operation immediately. Otherwise defer - * until the scsi layer has completed. - */ return; } =20 - if (esp_get_tc(s) =3D=3D 0) { - /* Partially filled a scsi buffer. Complete immediately. = */ + if (esp_get_tc(s) =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { esp_dma_done(s); esp_lower_drq(s); } } else { esp_set_pdma_cb(s, DO_DMA_PDMA_CB); esp_raise_drq(s); + + if (s->async_len =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { + /* Defer until the scsi layer has completed */ + scsi_req_continue(s->current_req); + return; + } + + if (esp_get_tc(s) =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { + esp_dma_done(s); + esp_lower_drq(s); + } } } else { if (s->dma_memory_write) { @@ -734,13 +741,13 @@ static void esp_do_dma(ESPState *s) s->async_len -=3D len; s->ti_size -=3D len; =20 - if (s->async_len =3D=3D 0) { + if (s->async_len =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { + /* Defer until the scsi layer has completed */ scsi_req_continue(s->current_req); return; } =20 - if (esp_get_tc(s) =3D=3D 0) { - /* Partially filled a scsi buffer. Complete immediately. = */ + if (esp_get_tc(s) =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { esp_dma_done(s); esp_lower_drq(s); } @@ -754,6 +761,17 @@ static void esp_do_dma(ESPState *s) esp_set_tc(s, esp_get_tc(s) - len); esp_set_pdma_cb(s, DO_DMA_PDMA_CB); esp_raise_drq(s); + + if (s->async_len =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { + /* Defer until the scsi layer has completed */ + scsi_req_continue(s->current_req); + return; + } + + if (esp_get_tc(s) =3D=3D 0 && fifo8_num_used(&s->fifo) < 2) { + esp_lower_drq(s); + esp_dma_done(s); + } } } } --=20 2.39.2