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  1. 06 Feb, 2015 3 commits
    • Ian Munsie's avatar
      cxl: Add missing return statement after handling AFU errror · a6130ed2
      Ian Munsie authored 
      We were missing a return statement in the PSL interrupt handler in the
case of an AFU error, which would trigger an "Unhandled CXL PSL IRQ"
warning. We do actually handle these type of errors (by notifying
userspace), so add the missing return IRQ_HANDLED so we don't throw
unecessary warnings.
Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      a6130ed2
    • Ian Munsie's avatar
      cxl: Fail AFU initialisation if an invalid configuration record is found · 3d5be039
      Ian Munsie authored 
      If an AFU claims to have a configuration record but doesn't actually
contain a vendor and device ID, fail the AFU initialisation. Right now
this is just a way of politely letting AFU developers know that they
need to fix their config space, but later on we may expose the AFUs as
actual PCI devices in their own right and don't want to inadvertendly
expose an AFU with a bad config space.
Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      3d5be039
    • Ian Munsie's avatar
      cxl: Export optional AFU configuration record in sysfs · b087e619
      Ian Munsie authored 
      An AFU may optionally contain one or more PCIe like configuration
records, which can be used to identify the AFU.

This patch adds support for exposing the raw config space and the
vendor, device and class code under sysfs. These will appear in a
subdirectory of the AFU device corresponding with the configuration
record number, e.g.

cat /sys/class/cxl/afu0.0/cr0/vendor
0x1014

cat /sys/class/cxl/afu0.0/cr0/device
0x4350

cat /sys/class/cxl/afu0.0/cr0/class
0x120000

hexdump -C /sys/class/cxl/afu0.0/cr0/config
00000000  14 10 50 43 00 00 00 00  06 00 00 12 00 00 00 00  |..PC............|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000100

These files behave in much the same way as the equivalent files for PCI
devices, with one exception being that the config file is currently
read-only and restricted to the root user. It is not necessarily
required to be this strict, but we currently do not have a compelling
use-case to make it writable and/or world-readable, so I erred on the
side of being restrictive.
Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      b087e619
  3. 04 Feb, 2015 3 commits
  5. 02 Feb, 2015 11 commits
  7. 31 Jan, 2015 1 commit
    • Arseny Solokha's avatar
      powerpc/mm: bail out early when flushing TLB page · 0dc294f7
      Arseny Solokha authored 
      MMU_NO_CONTEXT is conditionally defined as 0 or (unsigned int)-1. However,
in __flush_tlb_page() a corresponding variable is only tested for open
coded 0, which can cause NULL pointer dereference if `mm' argument was
legitimately passed as such.

Bail out early in case the first argument is NULL, thus eliminate confusion
between different values of MMU_NO_CONTEXT and avoid disabling and then
re-enabling preemption unnecessarily.
Signed-off-by: default avatarArseny Solokha <asolokha@kb.kras.ru>
Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
      0dc294f7
  9. 30 Jan, 2015 22 commits
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