This is a note to let you know that I've just added the patch titled PCI/ACPI: Fix _OSC ordering to allow PCIe hotplug use when available to the 3.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pci-acpi-fix-_osc-ordering-to-allow-pcie-hotplug-use-when-available.patch and it can be found in the queue-3.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 3dc48af310709b85d07c8b0d3aa8f1ead02829d3 Mon Sep 17 00:00:00 2001 From: Neil Horman <nhorman@xxxxxxxxxxxxx> Date: Thu, 29 Aug 2013 16:17:05 -0400 Subject: PCI/ACPI: Fix _OSC ordering to allow PCIe hotplug use when available From: Neil Horman <nhorman@xxxxxxxxxxxxx> commit 3dc48af310709b85d07c8b0d3aa8f1ead02829d3 upstream. This fixes the problem of acpiphp claiming slots that should be managed by pciehp, which may keep ExpressCard slots from working. The acpiphp driver claims PCIe slots unless the BIOS has granted us control of PCIe native hotplug via _OSC. Prior to v3.10, the acpiphp .add method (add_bridge()) was always called *after* we had requested native hotplug control with _OSC. But after 3b63aaa70e ("PCI: acpiphp: Do not use ACPI PCI subdriver mechanism"), which appeared in v3.10, acpiphp initialization is done during the bus scan via the pcibios_add_bus() hook, and this happens *before* we request native hotplug control. Therefore, acpiphp doesn't know yet whether the BIOS will grant control, and it claims slots that we should be handling with native hotplug. This patch requests native hotplug control earlier, so we know whether the BIOS granted it to us before we initialize acpiphp. To avoid reintroducing the ASPM issue fixed by b8178f130e ('Revert "PCI/ACPI: Request _OSC control before scanning PCI root bus"'), we run _OSC earlier but defer the actual ASPM calls until after the bus scan is complete. Tested successfully by myself. [bhelgaas: changelog, mark for stable] Reference: https://bugzilla.kernel.org/show_bug.cgi?id=60736 Signed-off-by: Neil Horman <nhorman@xxxxxxxxxxxxx> Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Acked-by: Yinghai Lu <yinghai@xxxxxxxxxx> CC: Len Brown <lenb@xxxxxxxxxx> CC: "Rafael J. Wysocki" <rjw@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/acpi/pci_root.c | 62 +++++++++++++++++++++++++++++------------------- 1 file changed, 38 insertions(+), 24 deletions(-) --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -378,6 +378,7 @@ static int acpi_pci_root_add(struct acpi struct acpi_pci_root *root; u32 flags, base_flags; acpi_handle handle = device->handle; + bool no_aspm = false, clear_aspm = false; root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); if (!root) @@ -437,27 +438,6 @@ static int acpi_pci_root_add(struct acpi flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; acpi_pci_osc_support(root, flags); - /* - * TBD: Need PCI interface for enumeration/configuration of roots. - */ - - /* - * Scan the Root Bridge - * -------------------- - * Must do this prior to any attempt to bind the root device, as the - * PCI namespace does not get created until this call is made (and - * thus the root bridge's pci_dev does not exist). - */ - root->bus = pci_acpi_scan_root(root); - if (!root->bus) { - dev_err(&device->dev, - "Bus %04x:%02x not present in PCI namespace\n", - root->segment, (unsigned int)root->secondary.start); - result = -ENODEV; - goto end; - } - - /* Indicate support for various _OSC capabilities. */ if (pci_ext_cfg_avail()) flags |= OSC_EXT_PCI_CONFIG_SUPPORT; if (pcie_aspm_support_enabled()) { @@ -471,7 +451,7 @@ static int acpi_pci_root_add(struct acpi if (ACPI_FAILURE(status)) { dev_info(&device->dev, "ACPI _OSC support " "notification failed, disabling PCIe ASPM\n"); - pcie_no_aspm(); + no_aspm = true; flags = base_flags; } } @@ -503,7 +483,7 @@ static int acpi_pci_root_add(struct acpi * We have ASPM control, but the FADT indicates * that it's unsupported. Clear it. */ - pcie_clear_aspm(root->bus); + clear_aspm = true; } } else { dev_info(&device->dev, @@ -512,7 +492,14 @@ static int acpi_pci_root_add(struct acpi acpi_format_exception(status), flags); dev_info(&device->dev, "ACPI _OSC control for PCIe not granted, disabling ASPM\n"); - pcie_no_aspm(); + /* + * We want to disable ASPM here, but aspm_disabled + * needs to remain in its state from boot so that we + * properly handle PCIe 1.1 devices. So we set this + * flag here, to defer the action until after the ACPI + * root scan. + */ + no_aspm = true; } } else { dev_info(&device->dev, @@ -520,6 +507,33 @@ static int acpi_pci_root_add(struct acpi "(_OSC support mask: 0x%02x)\n", flags); } + /* + * TBD: Need PCI interface for enumeration/configuration of roots. + */ + + /* + * Scan the Root Bridge + * -------------------- + * Must do this prior to any attempt to bind the root device, as the + * PCI namespace does not get created until this call is made (and + * thus the root bridge's pci_dev does not exist). + */ + root->bus = pci_acpi_scan_root(root); + if (!root->bus) { + dev_err(&device->dev, + "Bus %04x:%02x not present in PCI namespace\n", + root->segment, (unsigned int)root->secondary.start); + result = -ENODEV; + goto end; + } + + if (clear_aspm) { + dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n"); + pcie_clear_aspm(root->bus); + } + if (no_aspm) + pcie_no_aspm(); + pci_acpi_add_bus_pm_notifier(device, root->bus); if (device->wakeup.flags.run_wake) device_set_run_wake(root->bus->bridge, true); Patches currently in stable-queue which might be from nhorman@xxxxxxxxxxxxx are queue-3.11/pci-acpi-fix-_osc-ordering-to-allow-pcie-hotplug-use-when-available.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html