Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753619AbcCGWWW (ORCPT ); Mon, 7 Mar 2016 17:22:22 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:57082 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752891AbcCGWWL (ORCPT ); Mon, 7 Mar 2016 17:22:11 -0500 From: Sinan Kaya To: linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, timur@codeaurora.org, cov@codeaurora.org, jcm@redhat.com Cc: agross@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sinan Kaya , linux-kernel@vger.kernel.org Subject: [PATCH 1/2] pci: add pci_unmap_iospace function for PCI_IOBASE Date: Mon, 7 Mar 2016 17:21:49 -0500 Message-Id: <1457389310-3538-1-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2278 Lines: 68 The PCI_IOBASE needs to be released after hotplug removal so that it can be re-added back by the pci_remap_iospace function during insertion. Adding unmap function to follow IO remap function. Signed-off-by: Sinan Kaya --- drivers/pci/pci.c | 25 +++++++++++++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 26 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 3a516c0..f5faed2 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include @@ -3169,6 +3170,30 @@ int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr) #endif } +/** + * pci_unmap_iospace - Unmap the memory mapped I/O space + * @virt_addr: virtual address to be unmapped + * @size: size of the physical address to be unmapped + * + * Unmap the CPU virtual address @virt_addr from virtual address space. + * Only architectures that have memory mapped IO functions defined + * (and the PCI_IOBASE value defined) should call this function. + */ +void __weak pci_unmap_iospace(struct resource *res) +{ +#if defined(PCI_IOBASE) && defined(CONFIG_MMU) + unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start; + + unmap_kernel_range(vaddr, resource_size(res)); +#else + /* + * This architecture does not have memory mapped I/O space, + * so this function should never be called. + */ + WARN_ONCE(1, "This architecture does not support memory mapped I/O\n"); +#endif +} + static void __pci_set_master(struct pci_dev *dev, bool enable) { u16 old_cmd, cmd; diff --git a/include/linux/pci.h b/include/linux/pci.h index 398ae7e..c6e3f0e 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1172,6 +1172,7 @@ int pci_register_io_range(phys_addr_t addr, resource_size_t size); unsigned long pci_address_to_pio(phys_addr_t addr); phys_addr_t pci_pio_to_address(unsigned long pio); int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr); +void pci_unmap_iospace(struct resource *res); static inline pci_bus_addr_t pci_bus_address(struct pci_dev *pdev, int bar) { -- 1.8.2.1