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| author | Russell Currey <ruscur@russell.cc> | 2017-08-17 16:04:46 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-08-21 11:58:19 +1000 |
| commit | f5d90498d52cc128b90f65ce410dfb42943ba004 (patch) | |
| tree | 6a2b9cfbdafef6311d6af0078af731ca7c2c6786 /libc/test | |
| parent | c8d212e3bc079fa76b5c4c633b423a70f7e1772a (diff) | |
| download | skiboot-f5d90498d52cc128b90f65ce410dfb42943ba004.zip skiboot-f5d90498d52cc128b90f65ce410dfb42943ba004.tar.gz skiboot-f5d90498d52cc128b90f65ce410dfb42943ba004.tar.bz2 | |
pci: Wait for CRS and switch link when restoring bus numbers
When a complete reset occurs, after the PHB recovers it propagates a
reset down the wire to every device. At the same time, skiboot talks to
every device in order to restore the state of devices to what they were
before the reset.
In some situations, such as devices that recovered slowly and/or were
behind a switch, skiboot attempted to access config space of the device
before the link was up and the device could respond.
Fix this by retrying CRS until the device responds correctly, and for
devices behind a switch, making sure the switch has its link up first.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Russell Currey <ruscur@russell.cc>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Tested-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'libc/test')
0 files changed, 0 insertions, 0 deletions