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Date: Mon, 16 Nov 2015 17:36:30 +1030 From: Arthur Marsh <arthur.marsh@...ernode.on.net> To: Jiang Liu <jiang.liu@...ux.intel.com>, "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, Bjorn Helgaas <bhelgaas@...gle.com> Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org, x86@...nel.org, Keith Busch <keith.busch@...el.com> Subject: Re: [Bugfix] x86/PCI: Fix regression caused by commit 4d6b4e69a245 Jiang Liu wrote on 16/11/15 14:57: > From: Liu Jiang <jiang.liu@...ux.intel.com> > > Commit 4d6b4e69a245 ("x86/PCI/ACPI: Use common interface to support > PCI host bridge") converted x86 to use the common interface > acpi_pci_root_create, but the conversion missed on code piece in > arch/x86/pci/bus_numa.c, which causes regression on some legacy > AMD platforms as reported by Arthur Marsh <arthur.marsh@...ernode.on.net>. > The root causes is that acpi_pci_root_create() fails to insert > host bridge resources into iomem_resource/ioport_resource because > x86_pci_root_bus_resources() has already inserted those resources. > So change x86_pci_root_bus_resources() to not insert resources into > iomem_resource/ioport_resource. > > Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com> > Reported-and-tested-by: Arthur Marsh <arthur.marsh@...ernode.on.net> > Cc: Keith Busch <keith.busch@...el.com> > Cc: Arthur Marsh <arthur.marsh@...ernode.on.net> > --- > arch/x86/pci/bus_numa.c | 16 +++------------- > drivers/acpi/pci_root.c | 7 +++++++ > 2 files changed, 10 insertions(+), 13 deletions(-) > > diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c > index 7bcf06a7cd12..ce53b5b64f51 100644 > --- a/arch/x86/pci/bus_numa.c > +++ b/arch/x86/pci/bus_numa.c > @@ -41,27 +41,17 @@ void x86_pci_root_bus_resources(int bus, struct list_head *resources) > bus); > > /* already added by acpi ? */ > - resource_list_for_each_entry(window, resources) > + resource_list_for_each_entry(window, &info->resources) > if (window->res->flags & IORESOURCE_BUS) { > found = true; > break; > } > - > if (!found) > pci_add_resource(resources, &info->busn); > > - list_for_each_entry(root_res, &info->resources, list) { > - struct resource *res; > - struct resource *root; > + list_for_each_entry(root_res, &info->resources, list) > + pci_add_resource(resources, &root_res->res); > > - res = &root_res->res; > - pci_add_resource(resources, res); > - if (res->flags & IORESOURCE_IO) > - root = &ioport_resource; > - else > - root = &iomem_resource; > - insert_resource(root, res); > - } > return; > > default_resources: > diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c > index 850d7bf0c873..ae3fe4e64203 100644 > --- a/drivers/acpi/pci_root.c > +++ b/drivers/acpi/pci_root.c > @@ -768,6 +768,13 @@ static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) > else > continue; > > + /* > + * Some legacy x86 host bridge drivers use iomem_resource and > + * ioport_resource as default resource pool, skip it. > + */ > + if (res == root) > + continue; > + > conflict = insert_resource_conflict(root, res); > if (conflict) { > dev_info(&info->bridge->dev, > I have not previously seen the patch above and have not been able to successfully boot with it applied against the current Linus' git head. I had booted successfully with a kernel built with the patch below from 9 November 2015, then removed the patch below and applied the patch above from 16 November 2015, and when I booted the resulting kernel, received a lock-up: http://www.users.on.net/~arthur.marsh/20151116611.jpg I'd be happy to test further patches. Arthur. From 02818ba34bfa76d93f2a29c85660da0323b0b457 Mon Sep 17 00:00:00 2001 From: Liu Jiang <jiang.liu@...ux.intel.com> Date: Mon, 9 Nov 2015 13:36:48 +0800 Subject: [PATCH] Signed-off-by: Liu Jiang <jiang.liu@...ux.intel.com> --- arch/x86/pci/bus_numa.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c index 7bcf06a7cd12..022d83158cdb 100644 --- a/arch/x86/pci/bus_numa.c +++ b/arch/x86/pci/bus_numa.c @@ -51,6 +51,8 @@ void x86_pci_root_bus_resources(int bus, struct list_head *resources) pci_add_resource(resources, &info->busn); list_for_each_entry(root_res, &info->resources, list) { + pci_add_resource(resources, &root_res->res); +#if 0 struct resource *res; struct resource *root; @@ -61,6 +63,7 @@ void x86_pci_root_bus_resources(int bus, struct list_head *resources) else root = &iomem_resource; insert_resource(root, res); +#endif } return; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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