Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754089AbdLSXe5 (ORCPT ); Tue, 19 Dec 2017 18:34:57 -0500 Received: from bastet.se.axis.com ([195.60.68.11]:51505 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753835AbdLSXan (ORCPT ); Tue, 19 Dec 2017 18:30:43 -0500 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 v6 04/18] PCI: designware-ep: Pre-allocate memory for MSI in dw_pcie_ep_init Date: Wed, 20 Dec 2017 00:29:25 +0100 Message-Id: <20171219232940.659-5-niklas.cassel@axis.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171219232940.659-1-niklas.cassel@axis.com> References: <20171219232940.659-1-niklas.cassel@axis.com> X-TM-AS-GCONF: 00 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1825 Lines: 59 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 { -- 2.14.2