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author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-03 23:24:35 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-03 23:24:35 (GMT) |
commit | a9238741987386bb549d61572973c7e62b2a4145 (patch) | |
tree | 4e49f9c472f86b88cd569a088f7c0ac87ce8b78a /drivers/acpi | |
parent | 40031da445fb4d269af9c7c445b2adf674f171e7 (diff) | |
parent | e89c33168aad32436da842ddda307dcc31c0c4e2 (diff) | |
download | linux-a9238741987386bb549d61572973c7e62b2a4145.tar.xz |
Merge tag 'pci-v3.12-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI changes from Bjorn Helgaas:
PCI device hotplug:
- Use PCIe native hotplug, not ACPI hotplug, when possible (Neil Horman)
- Assign resources on per-host bridge basis (Yinghai Lu)
MPS (Max Payload Size):
- Allow larger MPS settings below hotplug-capable Root Port (Yijing Wang)
- Add warnings about unsafe MPS settings (Yijing Wang)
- Simplify interface and messages (Bjorn Helgaas)
SR-IOV:
- Return -ENOSYS on non-SR-IOV devices (Stefan Assmann)
- Update NumVFs register when disabling SR-IOV (Yijing Wang)
Virtualization:
- Add bus and slot reset support (Alex Williamson)
- Fix ACS (Access Control Services) issues (Alex Williamson)
Miscellaneous:
- Simplify PCIe Capability accessors (Bjorn Helgaas)
- Add pcibios_pm_ops for arch-specific hibernate stuff (Sebastian Ott)
- Disable decoding during BAR sizing only when necessary (Zoltan Kiss)
- Delay enabling bridges until they're needed (Yinghai Lu)
- Split Designware support into Synopsys and Exynos parts (Jingoo Han)
- Convert class code to use dev_groups (Greg Kroah-Hartman)
- Cleanup Designware and Exynos I/O access wrappers (Seungwon Jeon)
- Fix bridge I/O window alignment (Bjorn Helgaas)
- Add pci_wait_for_pending_transaction() (Casey Leedom)
- Use devm_ioremap_resource() in Marvell driver (Tushar Behera)
* tag 'pci-v3.12-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (63 commits)
PCI/ACPI: Fix _OSC ordering to allow PCIe hotplug use when available
PCI: exynos: Add I/O access wrappers
PCI: designware: Drop "addr" arg from dw_pcie_readl_rc()/dw_pcie_writel_rc()
PCI: Remove pcie_cap_has_devctl()
PCI: Support PCIe Capability Slot registers only for ports with slots
PCI: Remove PCIe Capability version checks
PCI: Allow PCIe Capability link-related register access for switches
PCI: Add offsets of PCIe capability registers
PCI: Tidy bitmasks and spacing of PCIe capability definitions
PCI: Remove obsolete comment reference to pci_pcie_cap2()
PCI: Clarify PCI_EXP_TYPE_PCI_BRIDGE comment
PCI: Rename PCIe capability definitions to follow convention
PCI: Warn if unsafe MPS settings detected
PCI: Fix MPS peer-to-peer DMA comment syntax
PCI: Disable decoding for BAR sizing only when it was actually enabled
PCI: Add comment about needing pci_msi_off() even when CONFIG_PCI_MSI=n
PCI: Add pcibios_pm_ops for optional arch-specific hibernate functionality
PCI: Don't restrict MPS for slots below Root Ports
PCI: Simplify MPS test for Downstream Port
PCI: Remove unnecessary check for pcie_get_mps() failure
...
Diffstat (limited to 'drivers/acpi')
-rw-r--r-- | drivers/acpi/pci_root.c | 67 |
1 files changed, 39 insertions, 28 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 5917839..d3874f4 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -378,6 +378,7 @@ static int acpi_pci_root_add(struct acpi_device *device, 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_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()) { @@ -471,7 +451,7 @@ static int acpi_pci_root_add(struct acpi_device *device, 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_device *device, * 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_device *device, 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, @@ -520,16 +507,40 @@ 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; + } + + 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); if (system_state != SYSTEM_BOOTING) { pcibios_resource_survey_bus(root->bus); - pci_assign_unassigned_bus_resources(root->bus); - - /* need to after hot-added ioapic is registered */ - pci_enable_bridges(root->bus); + pci_assign_unassigned_root_bus_resources(root->bus); } pci_bus_add_devices(root->bus); |