[CCs added]
Please always send PCI-related material to linux-pci in the first place.
The change that broke things for you was actually intentional:
commit b8178f130e25c1bdac1c33e0996f1ff6e20ec08e
Author: Bjorn Helgaas <bhelg...@google.com>
Date: Mon Apr 1 15:47:39 2013 -0600
Revert "PCI/ACPI: Request _OSC control before scanning PCI root bus"
This reverts commit 8c33f51df406e1a1f7fa4e9b244845b7ebd61fa6.
so I think we'll need to clean up the ASMP initialization after all.
On Friday, August 23, 2013 01:19:39 PM Neil Horman wrote:
> Somewhere between 3.9 and 3.10 it seems the order in which pcie and acpi
> probed
> slots for hotplug capabilites got reversed. While this isn't a big deal, it
> did
> uncover a bug in the ACPI bus setup path. Specifically, acpi_pci_root_add
> calls
> pci_acpi_scan_root before setting the osc flags for the device handle.
> pci_acpi_scan_root, among other things uses
> device_is_managed_by_native_pciehp()
> to determine if a given slot has pcie hotplug capabilties, whcih checks the
> devices OSC_PCI_EXPRESS_NATIVE_HP_CONTROL flag. Since that flag is not set
> until after pci_acpi_scan_root_completes, the acpi code never sees that pcie
> slots are hotplug capable and configures them all to use acpi instead.
>
> Fix is pretty simple, just defer the scan until after the osc flags have been
> set on the device. Tested by myself and it seems to work well.
>
> Signed-off-by: Neil Horman <nhor...@tuxdriver.com>
> CC: Len Brown <l...@kernel.org>
> CC: "Rafael J. Wysocki" <r...@sisk.pl>
> CC: linux-a...@vger.kernel.org
> ---
> drivers/acpi/pci_root.c | 41 ++++++++++++++++++++---------------------
> 1 file changed, 20 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index 5917839..a2c2661 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -437,27 +437,6 @@ static int acpi_pci_root_add(struct acpi_device *device,
> 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()) {
> @@ -520,6 +499,26 @@ static int acpi_pci_root_add(struct acpi_device *device,
> "(_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;
> + }
> +
> pci_acpi_add_bus_pm_notifier(device, root->bus);
> if (device->wakeup.flags.run_wake)
> device_set_run_wake(root->bus->bridge, true);
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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