From nobody Thu Dec 18 18:39:52 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10225C7619A for ; Sat, 15 Apr 2023 10:50:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230009AbjDOKuM (ORCPT ); Sat, 15 Apr 2023 06:50:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231133AbjDOKtw (ORCPT ); Sat, 15 Apr 2023 06:49:52 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F3894EF4; Sat, 15 Apr 2023 03:49:21 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id ABDE5617E4; Sat, 15 Apr 2023 10:47:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1FA17C433D2; Sat, 15 Apr 2023 10:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1681555629; bh=eA2ZxLGWNR6IdxbFmS127kxHvHFaTkPGETvRqPfSGHI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oZm1bHl7XW9SxEIIxUAftIHPOTtnfokBHFkTXliyMMm0VDJq0rS4/lb9Rsl65rgQv w/kF0nIlnI2ayXKT6YTcwti6KXBoP6YpssS7xQXh4K4ezaQ9FWfRbeFqVRSVGFm1c2 i7PCsG4PiOii528r5pJfKaPemJRou+sHlcWhstzi8FEcBJbpjflb5NHBEYTTSMKgTp fUqsA82F/Q1KGdXYQstbf0DUXyim6zw8KbETAK8p5QAl5WmqWFpB1NbjyWJ9w/oOHL IXCBMOzDrTx/XypzjjKxQ/2Uyb5tEZdow9cTx8cYeFA0kiX0CgCP8Z92G5ezcjC/LF RV8LGYwuN8n8Q== From: Jisheng Zhang To: Eugeniy Paltsev , Vinod Koul Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 09/11] dmaengine: dw-axi-dmac: try best to get residue when tx is running Date: Sat, 15 Apr 2023 18:35:59 +0800 Message-Id: <20230415103601.2979-10-jszhang@kernel.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230415103601.2979-1-jszhang@kernel.org> References: <20230415103601.2979-1-jszhang@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When tx is running, vchan_find_desc() will return NULL, try our best to get the residue in this case. Signed-off-by: Jisheng Zhang --- drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/d= w-axi-dmac/dw-axi-dmac-platform.c index a6e46cb66000..1c1b9574985a 100644 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c @@ -305,6 +305,7 @@ dma_chan_tx_status(struct dma_chan *dchan, dma_cookie_t= cookie, struct dma_tx_state *txstate) { struct axi_dma_chan *chan =3D dchan_to_axi_dma_chan(dchan); + struct axi_dma_desc *desc =3D NULL; struct virt_dma_desc *vdesc; enum dma_status status; u32 completed_length; @@ -322,9 +323,15 @@ dma_chan_tx_status(struct dma_chan *dchan, dma_cookie_= t cookie, =20 vdesc =3D vchan_find_desc(&chan->vc, cookie); if (vdesc) { - length =3D vd_to_axi_desc(vdesc)->length; - completed_blocks =3D vd_to_axi_desc(vdesc)->completed_blocks; - len =3D vd_to_axi_desc(vdesc)->hw_desc[0].len; + desc =3D vd_to_axi_desc(vdesc); + } else if (chan->desc && chan->desc->vd.tx.cookie =3D=3D cookie) { + desc =3D chan->desc; + } + + if (desc) { + length =3D desc->length; + completed_blocks =3D desc->completed_blocks; + len =3D desc->hw_desc[0].len; completed_length =3D completed_blocks * len; bytes =3D length - completed_length; } @@ -425,6 +432,7 @@ static void axi_chan_block_xfer_start(struct axi_dma_ch= an *chan, axi_chan_irq_set(chan, irq_mask); =20 axi_chan_enable(chan); + chan->desc =3D first; } =20 static void axi_chan_start_first_queued(struct axi_dma_chan *chan) @@ -1188,6 +1196,7 @@ static int dma_chan_terminate_all(struct dma_chan *dc= han) spin_unlock_irqrestore(&chan->vc.lock, flags); =20 vchan_dma_desc_free_list(&chan->vc, &head); + chan->desc =3D NULL; =20 dev_vdbg(dchan2dev(dchan), "terminated: %s\n", axi_chan_name(chan)); =20 --=20 2.39.2