From patchwork Fri Oct 13 16:09:07 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Cassel X-Patchwork-Id: 10005229 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 97C2F60360 for ; Fri, 13 Oct 2017 16:12:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 85E34290D6 for ; Fri, 13 Oct 2017 16:12:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 79798290DD; Fri, 13 Oct 2017 16:12:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1635A290D6 for ; Fri, 13 Oct 2017 16:12:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751921AbdJMQJa (ORCPT ); Fri, 13 Oct 2017 12:09:30 -0400 Received: from bastet.se.axis.com ([195.60.68.11]:52201 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751656AbdJMQJ3 (ORCPT ); Fri, 13 Oct 2017 12:09:29 -0400 Received: from localhost (localhost [127.0.0.1]) by bastet.se.axis.com (Postfix) with ESMTP id 2838418604; Fri, 13 Oct 2017 18:09:28 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at bastet.se.axis.com Received: from bastet.se.axis.com ([IPv6:::ffff:127.0.0.1]) by localhost (bastet.se.axis.com [::ffff:127.0.0.1]) (amavisd-new, port 10024) with LMTP id nRF0YUikmRUW; Fri, 13 Oct 2017 18:09:26 +0200 (CEST) Received: from boulder02.se.axis.com (boulder02.se.axis.com [10.0.8.16]) by bastet.se.axis.com (Postfix) with ESMTPS id 0282C182E7; Fri, 13 Oct 2017 18:09:26 +0200 (CEST) Received: from boulder02.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E5DFD1A069; Fri, 13 Oct 2017 18:09:25 +0200 (CEST) Received: from boulder02.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DAA9A1A066; Fri, 13 Oct 2017 18:09:25 +0200 (CEST) Received: from thoth.se.axis.com (unknown [10.0.2.173]) by boulder02.se.axis.com (Postfix) with ESMTP; Fri, 13 Oct 2017 18:09:25 +0200 (CEST) Received: from lnxartpec1.se.axis.com (lnxartpec1.se.axis.com [10.88.4.10]) by thoth.se.axis.com (Postfix) with ESMTP id CEA4FDFE; Fri, 13 Oct 2017 18:09:25 +0200 (CEST) Received: by lnxartpec1.se.axis.com (Postfix, from userid 20283) id CAAEC401A0; Fri, 13 Oct 2017 18:09:25 +0200 (CEST) From: Niklas Cassel To: Jingoo Han , Joao Pinto , Bjorn Helgaas Cc: Niklas Cassel , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 04/10] PCI: designware-ep: pre-allocate memory for MSI in dw_pcie_ep_init Date: Fri, 13 Oct 2017 18:09:07 +0200 Message-Id: <20171013160914.3220-5-niklas.cassel@axis.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20171013160914.3220-1-niklas.cassel@axis.com> References: <20171013160914.3220-1-niklas.cassel@axis.com> X-TM-AS-GCONF: 00 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Certain SoCs need to map the MSI address in raise_irq. To map an address, you first need to call pci_epc_mem_alloc_addr, however, pci_epc_mem_alloc_addr calls ioremap (which can sleep). Since raise_irq is only called from atomic context, we can't call pci_epc_mem_alloc_addr from raise_irq, instead we pre-allocate a page in dw_pcie_ep_init, so this page can later be used to map/unmap the MSI address in raise_irq. Signed-off-by: Niklas Cassel --- drivers/pci/dwc/pcie-designware-ep.c | 8 ++++++++ drivers/pci/dwc/pcie-designware.h | 2 ++ 2 files changed, 10 insertions(+) diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c index 3fb34be99715..c291da2a10ba 100644 --- a/drivers/pci/dwc/pcie-designware-ep.c +++ b/drivers/pci/dwc/pcie-designware-ep.c @@ -286,6 +286,8 @@ void dw_pcie_ep_exit(struct dw_pcie_ep *ep) { struct pci_epc *epc = ep->epc; + pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem, PAGE_SIZE); + pci_epc_mem_exit(epc); } @@ -341,6 +343,12 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep) return ret; } + ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys, PAGE_SIZE); + if (!ep->msi_mem) { + dev_err(dev, "Failed to reserve memory for MSI\n"); + return -ENOMEM; + } + ep->epc = epc; epc_set_drvdata(epc, ep); dw_pcie_setup(pci); diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h index 36183906e1d2..f56d040afde4 100644 --- a/drivers/pci/dwc/pcie-designware.h +++ b/drivers/pci/dwc/pcie-designware.h @@ -198,6 +198,8 @@ struct dw_pcie_ep { unsigned long ob_window_map; u32 num_ib_windows; u32 num_ob_windows; + void __iomem *msi_mem; + phys_addr_t msi_mem_phys; }; struct dw_pcie_ops {