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PCI: Make specifying PCI devices in kernel parameters reusable

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Separate out the code to match a PCI device with a string (typically
originating from a kernel parameter) from the
pci_specified_resource_alignment() function into its own helper function.

While we are at it, this change fixes the kernel style of the function
(fixing a number of long lines and extra parentheses).

Additionally, make the analogous change to the kernel parameter
documentation: Separate the description of how to specify a PCI device
into its own section at the head of the "pci=" parameter.

This patch should have no functional alterations.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
[bhelgaas: use "device" instead of "slot" in documentation since that's the
usual language in the PCI specs]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Stephen Bates <sbates@raithlin.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Logan Gunthorpe
2018-07-30 10:18:37 -06:00
committed by Bjorn Helgaas
parent bd2e9567db
commit 07d8d7e57c
2 changed files with 126 additions and 59 deletions
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28
Documentation/admin-guide/kernel-parameters.txt
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@@ -2994,7 +2994,26 @@
See header of drivers/block/paride/pcd.c.
See also Documentation/blockdev/paride.txt.
pci=option[,option...] [PCI] various PCI subsystem options:
pci=option[,option...] [PCI] various PCI subsystem options.
Some options herein operate on a specific device
or a set of devices (<pci_dev>). These are
specified in one of the following formats:
[<domain>:]<bus>:<device>.<func>
pci:<vendor>:<device>[:<subvendor>:<subdevice>]
Note: the first format specifies a PCI
bus/device/function address which may change
if new hardware is inserted, if motherboard
firmware changes, or due to changes caused
by other kernel parameters. If the
domain is left unspecified, it is
taken to be zero. The second format
selects devices using IDs from the
configuration space which may match multiple
devices in the system.
earlydump [X86] dump PCI config space before the kernel
changes anything
off [X86] don't probe for the PCI bus
@@ -3123,11 +3142,10 @@
window. The default value is 64 megabytes.
resource_alignment=
Format:
[<order of align>@][<domain>:]<bus>:<slot>.<func>[; ...]
[<order of align>@]pci:<vendor>:<device>\
[:<subvendor>:<subdevice>][; ...]
[<order of align>@]<pci_dev>[; ...]
Specifies alignment and device to reassign
aligned memory resources.
aligned memory resources. How to
specify the device is described above.
If <order of align> is not specified,
PAGE_SIZE is used as alignment.
PCI-PCI bridge can be specified, if resource