Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753355AbcDORP3 (ORCPT ); Fri, 15 Apr 2016 13:15:29 -0400 Received: from mail-wm0-f53.google.com ([74.125.82.53]:38629 "EHLO mail-wm0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752980AbcDORHN (ORCPT ); Fri, 15 Apr 2016 13:07:13 -0400 From: Tomasz Nowicki To: helgaas@kernel.org, arnd@arndb.de, will.deacon@arm.com, catalin.marinas@arm.com, rafael@kernel.org, hanjun.guo@linaro.org, Lorenzo.Pieralisi@arm.com, okaya@codeaurora.org, jiang.liu@linux.intel.com, jchandra@broadcom.com Cc: 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, Tomasz Nowicki Subject: [PATCH V6 01/13] pci, acpi, x86, ia64: Move ACPI host bridge device companion assignment to core code. Date: Fri, 15 Apr 2016 19:06:36 +0200 Message-Id: <1460740008-19489-2-git-send-email-tn@semihalf.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1460740008-19489-1-git-send-email-tn@semihalf.com> References: <1460740008-19489-1-git-send-email-tn@semihalf.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8102 Lines: 215 Currently we have two platforms (x86 & ia64) capable of PCI ACPI host bridge initialization. They both use arch-specific sysdata to pass down parent device reference and both rely on NULL parent in pci_create_root_bus() to validate sysdata content. It looks hacky and prevents us from getting some firmware specific info for PCI host controller based on its acpi_device structure in generic pci_create_root_bus() function. However, we overcome that blocker by passing down parent device via pci_create_root_bus parameter (as the ACPI device type). Then we use ACPI_COMPANION_SET in core code for ACPI boot method only. ACPI_COMPANION_SET is safe to run for all cases DT, ACPI and DT&ACPI. Since now PCI core code is setting ACPI companion device for us, x86 & ia64 specific ACPI companion device setting turns out to be dead now. We can get rid of it, including related companion reference from PCI sysdata structure. Aslo, PCI_CONTROLLER macro cannot return valid companion device anymore. Therefore we need to convert its usage to ACPI_COMPANION. Suggested-by: Lorenzo Pieralisi Signed-off-by: Tomasz Nowicki Reviewed-by: Lorenzo Pieralisi Tested-by: Duc Dang Tested-by: Dongdong Liu Tested-by: Hanjun Guo Tested-by: Graeme Gregory Tested-by: Sinan Kaya --- arch/ia64/hp/common/sba_iommu.c | 2 +- arch/ia64/include/asm/pci.h | 1 - arch/ia64/pci/pci.c | 16 ---------------- arch/ia64/sn/kernel/io_acpi_init.c | 4 ++-- arch/x86/include/asm/pci.h | 3 --- arch/x86/pci/acpi.c | 17 ----------------- drivers/acpi/pci_root.c | 7 ++++++- drivers/pci/probe.c | 2 ++ 8 files changed, 11 insertions(+), 41 deletions(-) diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c index a6d6190..78e4444 100644 --- a/arch/ia64/hp/common/sba_iommu.c +++ b/arch/ia64/hp/common/sba_iommu.c @@ -1981,7 +1981,7 @@ sba_connect_bus(struct pci_bus *bus) if (PCI_CONTROLLER(bus)->iommu) return; - handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion); + handle = acpi_device_handle(ACPI_COMPANION(bus->bridge)); if (!handle) return; diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h index c0835b0..12423f4 100644 --- a/arch/ia64/include/asm/pci.h +++ b/arch/ia64/include/asm/pci.h @@ -63,7 +63,6 @@ extern int pci_mmap_legacy_page_range(struct pci_bus *bus, #define pci_legacy_write platform_pci_legacy_write struct pci_controller { - struct acpi_device *companion; void *iommu; int segment; int node; /* nearest node with memory or NUMA_NO_NODE for global allocation */ diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c index 8f6ac2f..978d6af 100644 --- a/arch/ia64/pci/pci.c +++ b/arch/ia64/pci/pci.c @@ -301,28 +301,12 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) } info->controller.segment = root->segment; - info->controller.companion = device; info->controller.node = acpi_get_node(device->handle); INIT_LIST_HEAD(&info->io_resources); return acpi_pci_root_create(root, &pci_acpi_root_ops, &info->common, &info->controller); } -int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) -{ - /* - * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL - * here, pci_create_root_bus() has been called by someone else and - * sysdata is likely to be different from what we expect. Let it go in - * that case. - */ - if (!bridge->dev.parent) { - struct pci_controller *controller = bridge->bus->sysdata; - ACPI_COMPANION_SET(&bridge->dev, controller->companion); - } - return 0; -} - void pcibios_fixup_device_resources(struct pci_dev *dev) { int idx; diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c index 231234c..e454492 100644 --- a/arch/ia64/sn/kernel/io_acpi_init.c +++ b/arch/ia64/sn/kernel/io_acpi_init.c @@ -132,7 +132,7 @@ sn_get_bussoft_ptr(struct pci_bus *bus) struct acpi_resource_vendor_typed *vendor; - handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion); + handle = acpi_device_handle(ACPI_COMPANION(bus->bridge)); status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS, &sn_uuid, &buffer); if (ACPI_FAILURE(status)) { @@ -360,7 +360,7 @@ sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info, acpi_status status; struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - rootbus_handle = acpi_device_handle(PCI_CONTROLLER(dev)->companion); + rootbus_handle = acpi_device_handle(ACPI_COMPANION(dev->bus->bridge)); status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL, &segment); if (ACPI_SUCCESS(status)) { diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h index 9ab7507..24de07d 100644 --- a/arch/x86/include/asm/pci.h +++ b/arch/x86/include/asm/pci.h @@ -14,9 +14,6 @@ struct pci_sysdata { int domain; /* PCI domain */ int node; /* NUMA node */ -#ifdef CONFIG_ACPI - struct acpi_device *companion; /* ACPI companion device */ -#endif #ifdef CONFIG_X86_64 void *iommu; /* IOMMU private data */ #endif diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index 3cd6983..f4ca17a 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -340,7 +340,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) struct pci_sysdata sd = { .domain = domain, .node = node, - .companion = root->device }; memcpy(bus->sysdata, &sd, sizeof(sd)); @@ -355,7 +354,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) else { info->sd.domain = domain; info->sd.node = node; - info->sd.companion = root->device; bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &info->common, &info->sd); } @@ -373,21 +371,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) return bus; } -int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) -{ - /* - * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL - * here, pci_create_root_bus() has been called by someone else and - * sysdata is likely to be different from what we expect. Let it go in - * that case. - */ - if (!bridge->dev.parent) { - struct pci_sysdata *sd = bridge->bus->sysdata; - ACPI_COMPANION_SET(&bridge->dev, sd->companion); - } - return 0; -} - int __init pci_acpi_init(void) { struct pci_dev *dev = NULL; diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index ae3fe4e..4581e0e 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -564,6 +564,11 @@ static int acpi_pci_root_add(struct acpi_device *device, } } + /* + * pci_create_root_bus() needs to detect the parent device type, + * so initialize its companion data accordingly. + */ + ACPI_COMPANION_SET(&device->dev, device); root->device = device; root->segment = segment & 0xFFFF; strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); @@ -846,7 +851,7 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, pci_acpi_root_add_resources(info); pci_add_resource(&info->resources, &root->secondary); - bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, + bus = pci_create_root_bus(&device->dev, busnum, ops->pci_ops, sysdata, &info->resources); if (!bus) goto out_release_info; diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 8004f67..8087297 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2141,6 +2141,8 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, bridge->dev.parent = parent; bridge->dev.release = pci_release_host_bridge_dev; dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); + if (parent) + ACPI_COMPANION_SET(&bridge->dev, ACPI_COMPANION(parent)); error = pcibios_root_bridge_prepare(bridge); if (error) { kfree(bridge); -- 1.9.1