linux-kernel - [PATCH 0/2] PCI hotplug driver fixes

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Date: Thu,  9 May 2024 17:35:52 +0530
From: Krishna Kumar <krishnak@...ux.ibm.com>
To: mpe@...erman.id.au, npiggin@...il.com
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, brking@...ux.vnet.ibm.com,
        gbatra@...ux.ibm.com, aneesh.kumar@...nel.org,
        christophe.leroy@...roup.eu, nathanl@...ux.ibm.com,
        bhelgaas@...gle.com, oohall@...il.com, tpearson@...torengineering.com,
        mahesh.salgaonkar@...ibm.com, Krishna Kumar <krishnak@...ux.ibm.com>
Subject: [PATCH 0/2] PCI hotplug driver fixes

The fix of Powerpc hotplug driver (drivers/pci/hotplug/pnv_php.c)
addresses below two issues.

1. Kernel Crash during hot unplug of bridge/switch slot.

2. DPC-Support Enablement - Previously, when we do a hot-unplug
operation on a bridge slot, all the ports and devices behind the
bridge-ports would be hot-unplugged/offline, but when we do a hot-plug
operation on the same bridge slot, all the ports and devices behind the
bridge would not get hot-plugged/online. In this case, Only the first
port of the bridge gets enabled and the remaining port/devices remain
unplugged/offline.  After the fix, The hot-unplug and hot-plug
operations on the slot associated with the bridge started behaving
correctly and became in sync. Now, after the hot plug operation on the
same slot, all the bridge ports and devices behind the bridge become
hot-plugged/online/restored in the same manner as it was before the
hot-unplug operation.

Krishna Kumar (2):
  pci/hotplug/pnv_php: Fix hotplug driver crash on Powernv
  arch/powerpc: hotplug driver bridge support

 arch/powerpc/include/asm/ppc-pci.h |  4 +++
 arch/powerpc/kernel/pci-hotplug.c  |  5 ++--
 arch/powerpc/kernel/pci_dn.c       | 42 ++++++++++++++++++++++++++++++
 drivers/pci/hotplug/pnv_php.c      |  3 +--
 4 files changed, 49 insertions(+), 5 deletions(-)

-- 
2.44.0