From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 76262C54E4A for ; Thu, 7 Mar 2024 20:15:07 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=S1dNhY9a; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4TrLBd53vsz3vX0 for ; Fri, 8 Mar 2024 07:15:05 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=S1dNhY9a; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=139.178.84.217; helo=dfw.source.kernel.org; envelope-from=cassel@kernel.org; receiver=lists.ozlabs.org) Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4TrL9r302yz3c1w for ; Fri, 8 Mar 2024 07:14:24 +1100 (AEDT) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 0AAB661CE5; Thu, 7 Mar 2024 20:14:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 127C2C43601; Thu, 7 Mar 2024 20:14:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1709842461; bh=9g/TyhNGfCR/iMnSye5VRUmHHWo7BgK2gWR+z27+UT8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=S1dNhY9aEBZdeLadUrmkw3KVNJC43yd+/r60Z1+72kT3Quyl+APc7qLQipcl8d8EM JvQPq0542qirZbinHyPb1MB51ltlkKY9VSf1NpLvr2mH+5BZLENnTNqxwv3SWVqo74 5eL6TmB+xGwpyg3kuuG4BfPcOfVVKVsHBtUzhZuhlLGjMBgZyzHkLgTY4rHVzBmyBz nlbnWNSc2y8wOIANU03Q79If0DyOSBRaFxckaPRk9ZfYfpl5xuryktU/yt2N1KsC1S o6sZSJtjofvkdBb6rua6VV0NhR+zf7kNk+vsTcB0EHDcvyfS8YpAxOrX3g6kqdjeON qzNwC7PLd2sNA== Date: Thu, 7 Mar 2024 21:14:11 +0100 From: Niklas Cassel To: Manivannan Sadhasivam Subject: Re: [PATCH v9 03/10] PCI: dwc: ep: Introduce dw_pcie_ep_cleanup() API for drivers supporting PERST# Message-ID: References: <20240304-pci-dbi-rework-v9-0-29d433d99cda@linaro.org> <20240304-pci-dbi-rework-v9-3-29d433d99cda@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240304-pci-dbi-rework-v9-3-29d433d99cda@linaro.org> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Vignesh Raghavendra , Kunihiko Hayashi , linux-pci@vger.kernel.org, Lorenzo Pieralisi , Frank Li , Minghuan Lian , Thierry Reding , Kishon Vijay Abraham I , Fabio Estevam , Marek Vasut , Kishon Vijay Abraham I , Rob Herring , Jesper Nilsson , linux-tegra@vger.kernel.org, linux-arm-kernel@axis.com, Jonathan Hunter , NXP Linux Team , Richard Zhu , Srikanth Thokala , linux-arm-msm@vger.kernel.org, Sascha Hauer , linuxppc-dev@lists.ozlabs.org, Bjorn Helgaas , linux-omap@vger.kernel.org, Mingkai Hu , linux-arm-kernel@ lists.infradead.org, Roy Zang , Jingoo Han , Yoshihiro Shimoda , linux-kernel@vger.kernel.org, Vidya Sagar , linux-renesas-soc@vger.kernel.org, Masami Hiramatsu , Pengutronix Kernel Team , Gustavo Pimentel , Shawn Guo , Lucas Stach Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, Mar 04, 2024 at 02:52:15PM +0530, Manivannan Sadhasivam wrote: > For DWC glue drivers supporting PERST# (currently Qcom and Tegra194), some > of the DWC resources like eDMA should be cleaned up during the PERST# > assert time. > > So let's introduce a dw_pcie_ep_cleanup() API that could be called by these > drivers to cleanup the DWC specific resources. Currently, it just removes > eDMA. > > Reported-by: Niklas Cassel > Closes: https://lore.kernel.org/linux-pci/ZWYmX8Y%2F7Q9WMxES@x1-carbon > Reviewed-by: Frank Li > Signed-off-by: Manivannan Sadhasivam > --- > drivers/pci/controller/dwc/pcie-designware-ep.c | 11 +++++++++-- > drivers/pci/controller/dwc/pcie-designware.h | 5 +++++ > drivers/pci/controller/dwc/pcie-qcom-ep.c | 1 + > drivers/pci/controller/dwc/pcie-tegra194.c | 2 ++ > 4 files changed, 17 insertions(+), 2 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c > index 2b11290aab4c..1205bfba8310 100644 > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c > @@ -564,12 +564,19 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no, > return 0; > } > > -void dw_pcie_ep_deinit(struct dw_pcie_ep *ep) > +void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep) > { > struct dw_pcie *pci = to_dw_pcie_from_ep(ep); > - struct pci_epc *epc = ep->epc; > > dw_pcie_edma_remove(pci); > +} > +EXPORT_SYMBOL_GPL(dw_pcie_ep_cleanup); Since you are not clearing the iATU bits in ep->ib_window_map and ep->bar_to_atu, this will "leak" resources, so depending on how many inbound iATUs the platform has, by simply the RC toggling PERST, will cause an error when calling set_bar() after dw_pcie_ep_init_notify(). However, because you have said that you will address this in a follow up series: Reviewed-by: Niklas Cassel