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| author | Keith Busch <[email protected]> | 2016-04-28 16:24:48 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <[email protected]> | 2016-05-03 10:39:24 -0500 |
| commit | 26e515713342b6f7c553aa3c66b21c6ab7cf82af (patch) | |
| tree | b1a1f3223de5c7ea6d6a379f06f5d8d687ae7490 /lib/string_helpers.c | |
| parent | 10126ac14d36e74b2705802dc915b0b18463a51f (diff) | |
PCI: Add Downstream Port Containment driver
Add driver for the PCI Express Downstream Port Containment extended
capability. DPC is an optional capability to contain uncorrectable errors
below a port.
For more information on DPC, please see PCI Express Base Specification
Revision 4, section 7.31, or view the PCI-SIG DPC ECN here:
https://pcisig.com/sites/default/files/specification_documents/ECN_DPC_2012-02-09_finalized.pdf
When a DPC event is triggered, the hardware disables downstream links, so
the DPC driver schedules removal for all devices below this port. This may
happen concurrently with a PCIe hotplug driver if enabled. When all
downstream devices are removed and the link state transitions to disabled,
the DPC driver clears the DPC status and interrupt bits so the link may
retrain for a newly connected device.
[bhelgaas: clear (not set) DPC_CTL bits on remove, whitespace cleanup]
Signed-off-by: Keith Busch <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Cc: Lukas Wunner <[email protected]>
Diffstat (limited to 'lib/string_helpers.c')
0 files changed, 0 insertions, 0 deletions