# git rev-parse -q --verify 49a940dbdc3107fecd5e6d3063dc07128177e058^{commit}
49a940dbdc3107fecd5e6d3063dc07128177e058
already have revision, skipping fetch
# git checkout -q -f -B kisskb 49a940dbdc3107fecd5e6d3063dc07128177e058
# git clean -qxdf
# < git log -1
# commit 49a940dbdc3107fecd5e6d3063dc07128177e058
# Author: Gaurav Batra <gbatra@linux.ibm.com>
# Date:   Mon Apr 22 15:51:41 2024 -0500
# 
#     powerpc/pseries/iommu: LPAR panics during boot up with a frozen PE
#     
#     At the time of LPAR boot up, partition firmware provides Open Firmware
#     property ibm,dma-window for the PE. This property is provided on the PCI
#     bus the PE is attached to.
#     
#     There are execptions where the partition firmware might not provide this
#     property for the PE at the time of LPAR boot up. One of the scenario is
#     where the firmware has frozen the PE due to some error condition. This
#     PE is frozen for 24 hours or unless the whole system is reinitialized.
#     
#     Within this time frame, if the LPAR is booted, the frozen PE will be
#     presented to the LPAR but ibm,dma-window property could be missing.
#     
#     Today, under these circumstances, the LPAR oopses with NULL pointer
#     dereference, when configuring the PCI bus the PE is attached to.
#     
#       BUG: Kernel NULL pointer dereference on read at 0x000000c8
#       Faulting instruction address: 0xc0000000001024c0
#       Oops: Kernel access of bad area, sig: 7 [#1]
#       LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
#       Modules linked in:
#       Supported: Yes
#       CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.4.0-150600.9-default #1
#       Hardware name: IBM,9043-MRX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NM1060_023) hv:phyp pSeries
#       NIP:  c0000000001024c0 LR: c0000000001024b0 CTR: c000000000102450
#       REGS: c0000000037db5c0 TRAP: 0300   Not tainted  (6.4.0-150600.9-default)
#       MSR:  8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 28000822  XER: 00000000
#       CFAR: c00000000010254c DAR: 00000000000000c8 DSISR: 00080000 IRQMASK: 0
#       ...
#       NIP [c0000000001024c0] pci_dma_bus_setup_pSeriesLP+0x70/0x2a0
#       LR [c0000000001024b0] pci_dma_bus_setup_pSeriesLP+0x60/0x2a0
#       Call Trace:
#         pci_dma_bus_setup_pSeriesLP+0x60/0x2a0 (unreliable)
#         pcibios_setup_bus_self+0x1c0/0x370
#         __of_scan_bus+0x2f8/0x330
#         pcibios_scan_phb+0x280/0x3d0
#         pcibios_init+0x88/0x12c
#         do_one_initcall+0x60/0x320
#         kernel_init_freeable+0x344/0x3e4
#         kernel_init+0x34/0x1d0
#         ret_from_kernel_user_thread+0x14/0x1c
#     
#     Fixes: b1fc44eaa9ba ("pseries/iommu/ddw: Fix kdump to work in absence of ibm,dma-window")
#     Signed-off-by: Gaurav Batra <gbatra@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://msgid.link/20240422205141.10662-1-gbatra@linux.ibm.com
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 49a940dbdc3107fecd5e6d3063dc07128177e058
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  corenet64_smp_defconfig
Using /kisskb/src/arch/powerpc/configs/corenet_base.config as base
Merging /kisskb/src/arch/powerpc/configs/85xx-64bit.config
Merging /kisskb/src/arch/powerpc/configs/85xx-smp.config
Merging /kisskb/src/arch/powerpc/configs/altivec.config
Merging /kisskb/src/arch/powerpc/configs/85xx-hw.config
Merging /kisskb/src/arch/powerpc/configs/fsl-emb-nonhw.config
Merging /kisskb/src/arch/powerpc/configs/dpaa.config
#
# merged configuration written to .config (needs make)
#
# < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc13
# Build took: 0:03:16.175048