From nobody Mon Feb 9 11:51:33 2026 Delivered-To: importer@patchew.org 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; 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=1586931303; cv=none; d=zohomail.com; s=zohoarc; b=NLlzkzqNGA/kqVofi/DcL4fBcGtyIRI/CE3hwY+PSv8Rdk8+BysLntJ3IV31iRCjyXQQyRKnaY+MOnuuK5DCgLxhBSLAfL23frxSleAkR27h84nLS/sn0hPw/yuR3iSgh0N0dvisIc47NFHve7GkScUGdPdqJcUqgn8B+YJjWjo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1586931303; h=Content-Transfer-Encoding:Cc: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=I+zgtZTxXUbraJ2pkAgaO4KtsBprtGRRKgFifI2akZc=; b=EevvyrOM/NYy9lIg/cuS1ZP0IOWj8erln70skV3HwBHSF6IIkAVmzupXdDgDBmRs+7+x7YC9aZJpUH6gvOiWOAGqD6hULemsQQypipjA00BrSzOEgrRaR83llx6cm3fhs7yYtNHWvleprw2RFGJX4ZoTB3xkUlLG6CEiZwW+HYI= 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 15869313033311008.6332699373767; Tue, 14 Apr 2020 23:15:03 -0700 (PDT) Received: from localhost ([::1]:43910 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jObKA-0000D2-0A for importer@patchew.org; Wed, 15 Apr 2020 02:15:02 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35589) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jOaz1-0002sb-HB for qemu-devel@nongnu.org; Wed, 15 Apr 2020 01:53:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jOayy-0002qR-Sq for qemu-devel@nongnu.org; Wed, 15 Apr 2020 01:53:11 -0400 Received: from charlie.dont.surf ([128.199.63.193]:47566) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jOayu-0002Zd-QU; Wed, 15 Apr 2020 01:53:05 -0400 Received: from apples.local (80-167-98-190-cable.dk.customer.tdc.net [80.167.98.190]) by charlie.dont.surf (Postfix) with ESMTPSA id E45D0BFD79; Wed, 15 Apr 2020 05:52:27 +0000 (UTC) From: Klaus Jensen To: qemu-block@nongnu.org Subject: [PATCH v7 27/48] nvme: refactor dma read/write Date: Wed, 15 Apr 2020 07:51:19 +0200 Message-Id: <20200415055140.466900-28-its@irrelevant.dk> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200415055140.466900-1-its@irrelevant.dk> References: <20200415055140.466900-1-its@irrelevant.dk> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 128.199.63.193 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: , Cc: Kevin Wolf , Beata Michalska , Klaus Jensen , qemu-devel@nongnu.org, Max Reitz , Klaus Jensen , Keith Busch , Javier Gonzalez , Maxim Levitsky Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Klaus Jensen Refactor the nvme_dma_{read,write}_prp functions into a common function taking a DMADirection parameter. Signed-off-by: Klaus Jensen Reviewed-by: Maxim Levitsky --- hw/block/nvme.c | 88 ++++++++++++++++++++++++------------------------- 1 file changed, 43 insertions(+), 45 deletions(-) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index 3e41b1337bf7..2ff7dd695cd7 100644 --- a/hw/block/nvme.c +++ b/hw/block/nvme.c @@ -307,55 +307,50 @@ unmap: return status; } =20 -static uint16_t nvme_dma_write_prp(NvmeCtrl *n, uint8_t *ptr, uint32_t len, - uint64_t prp1, uint64_t prp2) +static uint16_t nvme_dma_prp(NvmeCtrl *n, uint8_t *ptr, uint32_t len, + uint64_t prp1, uint64_t prp2, DMADirection di= r) { QEMUSGList qsg; QEMUIOVector iov; uint16_t status =3D NVME_SUCCESS; =20 - if (nvme_map_prp(&qsg, &iov, prp1, prp2, len, n)) { - return NVME_INVALID_FIELD | NVME_DNR; + status =3D nvme_map_prp(&qsg, &iov, prp1, prp2, len, n); + if (status) { + return status; } + if (qsg.nsg > 0) { - if (dma_buf_write(ptr, len, &qsg)) { - status =3D NVME_INVALID_FIELD | NVME_DNR; + uint64_t residual; + + if (dir =3D=3D DMA_DIRECTION_TO_DEVICE) { + residual =3D dma_buf_write(ptr, len, &qsg); + } else { + residual =3D dma_buf_read(ptr, len, &qsg); } - qemu_sglist_destroy(&qsg); - } else { - if (qemu_iovec_to_buf(&iov, 0, ptr, len) !=3D len) { - status =3D NVME_INVALID_FIELD | NVME_DNR; - } - qemu_iovec_destroy(&iov); - } - return status; -} =20 -static uint16_t nvme_dma_read_prp(NvmeCtrl *n, uint8_t *ptr, uint32_t len, - uint64_t prp1, uint64_t prp2) -{ - QEMUSGList qsg; - QEMUIOVector iov; - uint16_t status =3D NVME_SUCCESS; - - trace_nvme_dev_dma_read(prp1, prp2); - - if (nvme_map_prp(&qsg, &iov, prp1, prp2, len, n)) { - return NVME_INVALID_FIELD | NVME_DNR; - } - if (qsg.nsg > 0) { - if (unlikely(dma_buf_read(ptr, len, &qsg))) { + if (unlikely(residual)) { trace_nvme_dev_err_invalid_dma(); status =3D NVME_INVALID_FIELD | NVME_DNR; } + qemu_sglist_destroy(&qsg); } else { - if (unlikely(qemu_iovec_from_buf(&iov, 0, ptr, len) !=3D len)) { + size_t bytes; + + if (dir =3D=3D DMA_DIRECTION_TO_DEVICE) { + bytes =3D qemu_iovec_to_buf(&iov, 0, ptr, len); + } else { + bytes =3D qemu_iovec_from_buf(&iov, 0, ptr, len); + } + + if (unlikely(bytes !=3D len)) { trace_nvme_dev_err_invalid_dma(); status =3D NVME_INVALID_FIELD | NVME_DNR; } + qemu_iovec_destroy(&iov); } + return status; } =20 @@ -788,8 +783,8 @@ static uint16_t nvme_smart_info(NvmeCtrl *n, NvmeCmd *c= md, uint8_t rae, nvme_clear_events(n, NVME_AER_TYPE_SMART); } =20 - return nvme_dma_read_prp(n, (uint8_t *) &smart + off, trans_len, prp1, - prp2); + return nvme_dma_prp(n, (uint8_t *) &smart + off, trans_len, prp1, prp2, + DMA_DIRECTION_FROM_DEVICE); } =20 static uint16_t nvme_fw_log_info(NvmeCtrl *n, NvmeCmd *cmd, uint32_t buf_l= en, @@ -808,8 +803,8 @@ static uint16_t nvme_fw_log_info(NvmeCtrl *n, NvmeCmd *= cmd, uint32_t buf_len, =20 trans_len =3D MIN(sizeof(fw_log) - off, buf_len); =20 - return nvme_dma_read_prp(n, (uint8_t *) &fw_log + off, trans_len, prp1, - prp2); + return nvme_dma_prp(n, (uint8_t *) &fw_log + off, trans_len, prp1, prp= 2, + DMA_DIRECTION_FROM_DEVICE); } =20 static uint16_t nvme_error_info(NvmeCtrl *n, NvmeCmd *cmd, uint8_t rae, @@ -833,7 +828,8 @@ static uint16_t nvme_error_info(NvmeCtrl *n, NvmeCmd *c= md, uint8_t rae, =20 trans_len =3D MIN(sizeof(errlog) - off, buf_len); =20 - return nvme_dma_read_prp(n, (uint8_t *)&errlog, trans_len, prp1, prp2); + return nvme_dma_prp(n, (uint8_t *)&errlog, trans_len, prp1, prp2, + DMA_DIRECTION_FROM_DEVICE); } =20 static uint16_t nvme_get_log(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req) @@ -981,8 +977,8 @@ static uint16_t nvme_identify_ctrl(NvmeCtrl *n, NvmeIde= ntify *c) =20 trace_nvme_dev_identify_ctrl(); =20 - return nvme_dma_read_prp(n, (uint8_t *)&n->id_ctrl, sizeof(n->id_ctrl), - prp1, prp2); + return nvme_dma_prp(n, (uint8_t *)&n->id_ctrl, sizeof(n->id_ctrl), prp= 1, + prp2, DMA_DIRECTION_FROM_DEVICE); } =20 static uint16_t nvme_identify_ns(NvmeCtrl *n, NvmeIdentify *c) @@ -1001,8 +997,8 @@ static uint16_t nvme_identify_ns(NvmeCtrl *n, NvmeIden= tify *c) =20 ns =3D &n->namespaces[nsid - 1]; =20 - return nvme_dma_read_prp(n, (uint8_t *)&ns->id_ns, sizeof(ns->id_ns), - prp1, prp2); + return nvme_dma_prp(n, (uint8_t *)&ns->id_ns, sizeof(ns->id_ns), prp1, + prp2, DMA_DIRECTION_FROM_DEVICE); } =20 static uint16_t nvme_identify_nslist(NvmeCtrl *n, NvmeIdentify *c) @@ -1027,7 +1023,8 @@ static uint16_t nvme_identify_nslist(NvmeCtrl *n, Nvm= eIdentify *c) break; } } - ret =3D nvme_dma_read_prp(n, (uint8_t *)list, data_len, prp1, prp2); + ret =3D nvme_dma_prp(n, (uint8_t *)list, data_len, prp1, prp2, + DMA_DIRECTION_FROM_DEVICE); g_free(list); return ret; } @@ -1066,7 +1063,8 @@ static uint16_t nvme_identify_ns_descr_list(NvmeCtrl = *n, NvmeIdentify *c) ns_descrs->uuid.hdr.nidl =3D NVME_NIDT_UUID_LEN; stl_be_p(&ns_descrs->uuid.v, nsid); =20 - return nvme_dma_read_prp(n, list, NVME_IDENTIFY_DATA_SIZE, prp1, prp2); + return nvme_dma_prp(n, list, NVME_IDENTIFY_DATA_SIZE, prp1, prp2, + DMA_DIRECTION_FROM_DEVICE); } =20 static uint16_t nvme_identify(NvmeCtrl *n, NvmeCmd *cmd) @@ -1147,8 +1145,8 @@ static uint16_t nvme_get_feature_timestamp(NvmeCtrl *= n, NvmeCmd *cmd) =20 uint64_t timestamp =3D nvme_get_timestamp(n); =20 - return nvme_dma_read_prp(n, (uint8_t *)×tamp, - sizeof(timestamp), prp1, prp2); + return nvme_dma_prp(n, (uint8_t *)×tamp, sizeof(timestamp), prp1, + prp2, DMA_DIRECTION_FROM_DEVICE); } =20 static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *r= eq) @@ -1233,8 +1231,8 @@ static uint16_t nvme_set_feature_timestamp(NvmeCtrl *= n, NvmeCmd *cmd) uint64_t prp1 =3D le64_to_cpu(cmd->dptr.prp1); uint64_t prp2 =3D le64_to_cpu(cmd->dptr.prp2); =20 - ret =3D nvme_dma_write_prp(n, (uint8_t *)×tamp, - sizeof(timestamp), prp1, prp2); + ret =3D nvme_dma_prp(n, (uint8_t *)×tamp, sizeof(timestamp), prp1, + prp2, DMA_DIRECTION_TO_DEVICE); if (ret !=3D NVME_SUCCESS) { return ret; } --=20 2.26.0