From patchwork Mon Nov 20 13:32:07 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Cassel X-Patchwork-Id: 839537 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3ygV5n2zLwz9s0g for ; Tue, 21 Nov 2017 00:33:01 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751086AbdKTNc7 (ORCPT ); Mon, 20 Nov 2017 08:32:59 -0500 Received: from bastet.se.axis.com ([195.60.68.11]:39531 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751252AbdKTNc6 (ORCPT ); Mon, 20 Nov 2017 08:32:58 -0500 Received: from localhost (localhost [127.0.0.1]) by bastet.se.axis.com (Postfix) with ESMTP id A2752183AC; Mon, 20 Nov 2017 14:32:56 +0100 (CET) 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 i2xfxxoweRek; Mon, 20 Nov 2017 14:32:55 +0100 (CET) Received: from boulder03.se.axis.com (boulder03.se.axis.com [10.0.8.17]) by bastet.se.axis.com (Postfix) with ESMTPS id 4ED8C180E6; Mon, 20 Nov 2017 14:32:55 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3C80D1E07D; Mon, 20 Nov 2017 14:32:55 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 303ED1E07C; Mon, 20 Nov 2017 14:32:55 +0100 (CET) Received: from thoth.se.axis.com (unknown [10.0.2.173]) by boulder03.se.axis.com (Postfix) with ESMTP; Mon, 20 Nov 2017 14:32:55 +0100 (CET) Received: from lnxartpec1.se.axis.com (lnxartpec1.se.axis.com [10.88.4.10]) by thoth.se.axis.com (Postfix) with ESMTP id 233ED19AA; Mon, 20 Nov 2017 14:32:55 +0100 (CET) Received: by lnxartpec1.se.axis.com (Postfix, from userid 20283) id 1F345400FE; Mon, 20 Nov 2017 14:32:55 +0100 (CET) From: Niklas Cassel To: Jingoo Han , Joao Pinto , Lorenzo Pieralisi , Bjorn Helgaas Cc: Niklas Cassel , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 04/18] PCI: designware-ep: Pre-allocate memory for MSI in dw_pcie_ep_init Date: Mon, 20 Nov 2017 14:32:07 +0100 Message-Id: <20171120133222.27771-5-niklas.cassel@axis.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171120133222.27771-1-niklas.cassel@axis.com> References: <20171120133222.27771-1-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 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. Pre-allocate a page in dw_pcie_ep_init(), so that 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 | 10 ++++++++++ drivers/pci/dwc/pcie-designware.h | 2 ++ 2 files changed, 12 insertions(+) diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c index 3fb34be99715..8d8019cdff2a 100644 --- a/drivers/pci/dwc/pcie-designware-ep.c +++ b/drivers/pci/dwc/pcie-designware-ep.c @@ -286,6 +286,9 @@ 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, + epc->mem->page_size); + pci_epc_mem_exit(epc); } @@ -341,6 +344,13 @@ 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, + epc->mem->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 9aaf0cd04dd6..5a1da459eda5 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 {