tree f8b476a1af9cacc476f11cce0675c99c1f69296b
parent 31bbd45af313c3b1cdaa98e5a2de65194cf7d948
author Russell Currey <ruscur@russell.cc> 1497413999 +1000
committer Michael Ellerman <mpe@ellerman.id.au> 1498529667 +1000

powerpc/powernv/pci: Dynamically allocate PHB diag data

Diagnostic data for PHBs currently works by allocated a fixed-sized buffer.
This is simple, but either wastes memory (though only a few kilobytes) or
in the case of PHB4 isn't enough to fit the whole data blob.

For machines that don't describe the diagnostic data size in the device
tree, use the hardcoded buffer size as before.  For those that do, only
allocate exactly what's needed.

In the special case of P7IOC (which has two types of diag data), the larger
should be specified in the device tree.

Signed-off-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>