From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161583AbcFBR3n (ORCPT ); Thu, 2 Jun 2016 13:29:43 -0400 Received: from foss.arm.com ([217.140.101.70]:46884 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932175AbcFBR3l (ORCPT ); Thu, 2 Jun 2016 13:29:41 -0400 Date: Thu, 2 Jun 2016 18:30:05 +0100 From: Lorenzo Pieralisi To: Tomasz Nowicki Cc: helgaas@kernel.org, arnd@arndb.de, will.deacon@arm.com, catalin.marinas@arm.com, rafael@kernel.org, hanjun.guo@linaro.org, okaya@codeaurora.org, jchandra@broadcom.com, robert.richter@caviumnetworks.com, mw@semihalf.com, Liviu.Dudau@arm.com, ddaney@caviumnetworks.com, wangyijing@huawei.com, Suravee.Suthikulpanit@amd.com, msalter@redhat.com, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org, jcm@redhat.com, andrea.gallo@linaro.org, dhdang@apm.com, jeremy.linton@arm.com, liudongdong3@huawei.com, cov@codeaurora.org Subject: Re: [PATCH V8 4/9] acpi, pci: Support IO resources when parsing PCI host bridge resources. Message-ID: <20160602173005.GH13962@red-moon> References: <1464621262-26770-1-git-send-email-tn@semihalf.com> <1464621262-26770-5-git-send-email-tn@semihalf.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1464621262-26770-5-git-send-email-tn@semihalf.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 30, 2016 at 05:14:17PM +0200, Tomasz Nowicki wrote: > Platforms that have memory mapped IO port (such as ARM64) need special > handling for PCI I/O resources. For host bridge's resource probing case > these resources need to be fixed up with pci_register_io_range/pci_remap_iospace etc. > > The same I/O resources need to be released after hotplug > removal so that it can be re-added back by the pci_remap_iospace > function during insertion. As a consequence we unmap I/O resources > with pci_unmap_iospace when we release host bridge resources. > > Signed-off-by: Jayachandran C > Signed-off-by: Sinan Kaya > Signed-off-by: Tomasz Nowicki > --- > drivers/acpi/pci_root.c | 39 +++++++++++++++++++++++++++++++++++++++ > 1 file changed, 39 insertions(+) I will take a rain-check on ACPI PCI IO space consolidation between IA64 and ARM64. > diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c > index ae3fe4e..ee3b728 100644 > --- a/drivers/acpi/pci_root.c > +++ b/drivers/acpi/pci_root.c > @@ -720,6 +720,40 @@ next: > } > } > > +#ifdef PCI_IOBASE > +static void acpi_pci_root_remap_iospace(struct resource_entry *entry) > +{ > + struct resource *res = entry->res; > + resource_size_t cpu_addr = res->start; > + resource_size_t pci_addr = cpu_addr - entry->offset; > + resource_size_t length = resource_size(res); > + unsigned long port; > + > + if (pci_register_io_range(cpu_addr, length)) > + goto err; > + > + port = pci_address_to_pio(cpu_addr); > + if (port == (unsigned long)-1) > + goto err; > + > + res->start = port; > + res->end = port + length - 1; > + entry->offset = port - pci_addr; > + > + if (pci_remap_iospace(res, cpu_addr) < 0) > + goto err; > + > + pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res); Side note: we need to allocate and request a resource for the corresponding memory resource (and do that for DT and ACPI alike), see above. Reviewed-by: Lorenzo Pieralisi > + return; > +err: > + res->flags |= IORESOURCE_DISABLED; > +} > +#else > +static void acpi_pci_root_remap_iospace(struct resource_entry *entry) > +{ > +} > +#endif > + > int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) > { > int ret; > @@ -740,6 +774,9 @@ int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) > "no IO and memory resources present in _CRS\n"); > else { > resource_list_for_each_entry_safe(entry, tmp, list) { > + if (entry->res->flags & IORESOURCE_IO) > + acpi_pci_root_remap_iospace(entry); > + > if (entry->res->flags & IORESOURCE_DISABLED) > resource_list_destroy_entry(entry); > else > @@ -811,6 +848,8 @@ static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) > > resource_list_for_each_entry(entry, &bridge->windows) { > res = entry->res; > + if (res->flags & IORESOURCE_IO) > + pci_unmap_iospace(res); > if (res->parent && > (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) > release_resource(res); > -- > 1.9.1 >