linux.git/drivers/pci/setup-bus.c, branch v3.13

PCI: Fix whitespace, capitalization, and spelling errors

2013-11-14T18:28:18+00:00

Fix whitespace, capitalization, and spelling errors.  No functional change.
I know "busses" is not an error, but "buses" was more common, so I used it
consistently.

Signed-off-by: Marta Rybczynska  (pci_reset_bridge_secondary_bus())
Signed-off-by: Bjorn Helgaas 
Acked-by: Rafael J. Wysocki

PCI: Pass type, width, and prefetchability for window alignment

2013-09-25T21:44:58+00:00

When calculating window_alignment(), type information like IORESOURCE_MEM
and IORESOURCE_PREFETCH may not be enough.  For example, on powernv, we
need to know whether the window is 64-bit or not.

This patch passes the full resource type (res->flags) for window alignment.

[bhelgaas: changelog]
Signed-off-by: Wei Yang 
Signed-off-by: Bjorn Helgaas 
Acked-by: Gavin Shan

PCI: Use pci_is_root_bus() to check for root bus

2013-09-25T21:43:48+00:00

In __pci_bus_size_bridges() we check whether a bus is a root bus by testing
bus->self.  As indicated by commit 79af72d7 ("PCI: pci_is_root_bus
helper"), bus->self == NULL is not a proper way to check for a root bus.
One issue is that "virtual" buses added for SR-IOV (via virtfn_add_bus())
have bus->self == NULL but are not root buses.

This patch changes it to pci_is_root_bus() to check whether it is a root
bus.

[bhelgaas: changelog]
Signed-off-by: Wei Yang 
Signed-off-by: Bjorn Helgaas

Merge tag 'pci-v3.12-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

2013-09-03T23:24:35+00:00

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
  ...

Merge branch 'pci/yinghai-assign-unassigned-v6' into next

2013-08-26T21:40:03+00:00

* pci/yinghai-assign-unassigned-v6:
  PCI: Assign resources for hot-added host bridge more aggressively
  PCI: Move resource reallocation code to non-__init
  PCI: Delay enabling bridges until they're needed
  PCI: Assign resources on a per-bus basis
  PCI: Enable unassigned resource reallocation on per-bus basis
  PCI: Turn on reallocation for unassigned resources with host bridge offset
  PCI: Look for unassigned resources on per-bus basis
  PCI: Drop temporary variable in pci_assign_unassigned_resources()

PCI: Align bridge I/O windows as required by downstream devices & bridges

2013-08-05T22:15:10+00:00

An upstream bridge's I/O window must be at least as aligned as any
downstream device or bridge requires.  In particular, if the upstream
bridge supports 1K alignment but a downstream bridge requires 4K alignment,
the upstream window must also be 4K aligned.

Therefore, do not reduce the required alignment ("min_align") based on
the upstream bridge's capabilities.

Reported-by: Wei Yang 
Suggested-by: Yinghai Lu 
Signed-off-by: Bjorn Helgaas

PCI: Fix types in pbus_size_io()

2013-08-02T22:15:32+00:00

This patch changes the type of "size" to resource_size_t and makes the
corresponding dev_printk() change.

[bhelgaas: changelog]
Signed-off-by: Wei Yang 
Signed-off-by: Bjorn Helgaas

PCI: Add comments for pbus_size_mem() parameters

2013-08-02T22:15:26+00:00

This patch fills in the missing description for two parameters of
pbus_size_mem().

Signed-off-by: Wei Yang 
Signed-off-by: Bjorn Helgaas

PCI: Enumerate subordinate buses, not devices, in pci_bus_get_depth()

2013-08-02T22:11:09+00:00

Normally, on one PCI bus there would be more devices than bridges.  When
calculating the depth of a PCI bus, it would be more time efficient to
enumerating through the child buses instead of the child devices.

Also by doing so, the code seems more self explaining.  Previously, it went
through the devices and checked whether a bridge introduced a child bus or
not, which needs more background knowledge to understand it.

This patch calculates the depth by enumerating the bus hierarchy.

Signed-off-by: Wei Yang 
Signed-off-by: Bjorn Helgaas

PCI: Retry allocation of only the resource type that failed

2013-07-26T13:32:20+00:00

Ben Herrenschmidt reported the following problem:

  - The bus has space for all desired MMIO resources, including optional
    space for SR-IOV devices
  - We attempt to allocate I/O port space, but it fails because the bus
    has no I/O space
  - Because of the I/O allocation failure, we retry MMIO allocation,
    requesting only the required space, without the optional SR-IOV space

This means we don't allocate the optional SR-IOV space, even though we
could.

This is related to 0c5be0cb0e ("PCI: Retry on IORESOURCE_IO type
allocations").

This patch changes how we handle allocation failures.  We will now retry
allocation of only the resource type that failed.  If MMIO allocation
fails, we'll retry only MMIO allocation.  If I/O port allocation fails,
we'll retry only I/O port allocation.

[bhelgaas: changelog]
Reference: https://lkml.kernel.org/r/1367712653.11982.19.camel@pasglop
Reported-by: Benjamin Herrenschmidt 
Tested-by: Gavin Shan 
Signed-off-by: Yinghai Lu 
Signed-off-by: Bjorn Helgaas 
CC: stable@vger.kernel.org	# v3.10+