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 X-Spam-Level: X-Spam-Status: No, score=-8.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2DD7C10F13 for ; Tue, 16 Apr 2019 13:36:17 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B3BC1217F9 for ; Tue, 16 Apr 2019 13:36:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ssOGK/0s" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B3BC1217F9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=phMbW9kgRpRr0j0PfP6QYZXeyy5FiOBe3ZEL78BW8PM=; b=ssOGK/0sLnukWH xnpK42afRY7wUq0iKnLS8W0+pnbOnn7Zc/W9LwcK2rxPk1VQ5si7RmLvCm2Xf0rw31EjH6Xs6iPX3 RPUp+MahIBSvfYsMnfG0/OEQAlQW2sqDFiLXglN1eoktCx0W82WpPWOTS9Th9+u8m3i169K83rXk7 ejNlEOOCoIKraz+YvA7NoPJ/l2XSOogIBnAp4ma5q1nTYmJUgL4YDdDY9Otx+wsbYmT4G4sRzEVQY KJyaLez6ClUk1lo5CZDk/fv+Xj8C3CZlj0IwMMDnKdtyolWK6OuUm4yj44toGhsuY3e0u1lO8iofv VPRvJya7azhtEaH/5vJg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hGOFv-0000xu-K4; Tue, 16 Apr 2019 13:36:11 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hGOFs-0000xP-V1 for linux-arm-kernel@lists.infradead.org; Tue, 16 Apr 2019 13:36:10 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9394CEBD; Tue, 16 Apr 2019 06:36:08 -0700 (PDT) Received: from red-moon (unknown [10.1.197.39]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 35A6B3F59C; Tue, 16 Apr 2019 06:36:06 -0700 (PDT) Date: Tue, 16 Apr 2019 14:36:04 +0100 From: Lorenzo Pieralisi To: Bjorn Helgaas Subject: Re: [PATCH v2 23/26] PCI: designware-ep: Configure RESBAR to advertise the smallest size Message-ID: <20190416133604.GA14705@red-moon> References: <20190325083501.8088-1-kishon@ti.com> <20190325083501.8088-24-kishon@ti.com> <20190413160053.GI126710@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190413160053.GI126710@google.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190416_063609_007240_866726F2 X-CRM114-Status: GOOD ( 24.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Arnd Bergmann , Greg Kroah-Hartman , Jingoo Han , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@axis.com, Kishon Vijay Abraham I , Rob Herring , Murali Karicheri , Gustavo Pimentel , linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Apr 13, 2019 at 11:00:53AM -0500, Bjorn Helgaas wrote: > On Mon, Mar 25, 2019 at 02:04:58PM +0530, Kishon Vijay Abraham I wrote: > > Configure RESBAR capability to advertise the smallest size (1MB) for > > couple of reasons. A) Host side resource allocation of BAR fails for > > larger sizes. B) Endpoint function driver does not allocate memory > > for all supported sizes in RESBAR capability. > > If and when there is a usecase required to add more flexibility using > > RESBAR, this can be revisited. > > The #define used in the code below is "REBAR"; maybe spell it out > once and then use REBAR instead of RESBAR? I think we should just name the capability as it is (Resizable BAR) the kernel defines are there already anyway. I will rewrite the log accordingly. Lorenzo > > Signed-off-by: Kishon Vijay Abraham I > > --- > > .../pci/controller/dwc/pcie-designware-ep.c | 34 +++++++++++++++++++ > > 1 file changed, 34 insertions(+) > > > > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c > > index 74477ad7467f..0c208b9bda43 100644 > > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c > > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c > > @@ -504,10 +504,32 @@ void dw_pcie_ep_exit(struct dw_pcie_ep *ep) > > pci_epc_mem_exit(epc); > > } > > > > +static unsigned int dw_pcie_ep_find_ext_capability(struct dw_pcie *pci, int cap) > > +{ > > + u32 header; > > + int pos = PCI_CFG_SPACE_SIZE; > > + > > + while (pos) { > > + header = dw_pcie_readl_dbi(pci, pos); > > + if (PCI_EXT_CAP_ID(header) == cap) > > + return pos; > > + > > + pos = PCI_EXT_CAP_NEXT(header); > > + if (!pos) > > + break; > > + } > > + > > + return 0; > > +} > > + > > int dw_pcie_ep_init(struct dw_pcie_ep *ep) > > { > > + int i; > > int ret; > > + u32 reg; > > void *addr; > > + unsigned int nbars; > > + unsigned int offset; > > struct pci_epc *epc; > > struct dw_pcie *pci = to_dw_pcie_from_ep(ep); > > struct device *dev = pci->dev; > > @@ -591,6 +613,18 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep) > > > > ep->msix_cap = dw_pcie_ep_find_capability(pci, PCI_CAP_ID_MSIX); > > > > + offset = dw_pcie_ep_find_ext_capability(pci, PCI_EXT_CAP_ID_REBAR); > > + if (offset) { > > + reg = dw_pcie_readl_dbi(pci, offset + PCI_REBAR_CTRL); > > + nbars = (reg & PCI_REBAR_CTRL_NBAR_MASK) >> > > + PCI_REBAR_CTRL_NBAR_SHIFT; > > + > > + dw_pcie_dbi_ro_wr_en(pci); > > + for (i = 0; i < nbars; i++, offset += PCI_REBAR_CTRL) > > + dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, 0x0); > > + dw_pcie_dbi_ro_wr_dis(pci); > > + } > > + > > dw_pcie_setup(pci); > > > > return 0; > > -- > > 2.17.1 > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel