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linux/arch/powerpc/kernel
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Andrew Donnellan dc9c41bd9e Revert "powerpc/eeh: Don't unfreeze PHB PE after reset" 
This reverts commit 527d10ef3a.

The reverted commit breaks cxlflash devices following an EEH reset (and
possibly other cxl devices, however this has not been tested).

The reverted commit changed the behaviour of eeh_reset_device() so that PHB
PEs are not unfrozen following the completion of the reset. This should not
be problematic, as no device resources should have been associated with the
PHB PE.

However, when attempting to load the cxlflash driver after a reset, the
driver attempts to read Vital Product Data through a call to
pci_read_vpd() (which is called on the physical cxl device, not on the
virtual AFU device). pci_read_vpd() in turn attempts to read from the cxl
device's config space. This fails, as the PE it's trying to read from is
still frozen. In turn, the driver gets an -ENODEV and fails to initialise.

It appears this issue only affects some parts of the VPD area, as "lspci
-vvv", which only reads a subset of the VPD bytes, is not broken by the
original patch.

At this stage, we don't fully understand why we're trying to read a frozen
PE, and we don't know how this affects other cxl devices. It is possible
that there is an underlying bug in the cxl driver or the powerpc CAPI
support code, or alternatively a bug in the PCI resource allocation/mapping
code that is incorrectly mapping resources to PE#0.

As such, this fix is incomplete, however it is necessary to prevent a
serious regression in CAPI support.

In the meantime, revert the commit, especially as it was intended to be a
non-functional change.

Cc: Gavin Shan <gwshan@linux.vnet.ibm.com>
Cc: Ian Munsie <imunsie@au1.ibm.com>
Cc: Daniel Axtens <dja@axtens.net>
Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-09 14:05:10 +11:00
..
vdso32 powerpc/vdso: Avoid link stack corruption in __get_datapage() 2015-10-01 16:52:02 +10:00
vdso64 powerpc/vdso: Avoid link stack corruption in __get_datapage() 2015-10-01 16:52:02 +10:00
.gitignore
align.c powerpc: Remove double braces in alignment code. 2014-11-10 09:59:32 +11:00
asm-offsets.c ARM: 2015-09-10 16:42:49 -07:00
audit.c
btext.c
cacheinfo.c powerpc: Fix missing L2 cache size in /sys/devices/system/cpu 2015-04-11 20:49:28 +10:00
cacheinfo.h
compat_audit.c
cpu_setup_6xx.S
cpu_setup_44x.S
cpu_setup_fsl_booke.S powerpc/booke: Restrict SPE exception handlers to e200/e500 cores 2014-09-22 10:11:31 +02:00
cpu_setup_pa6t.S
cpu_setup_power.S powerpc/book3s: Fix flush_tlb cpu_spec hook to take a generic argument. 2015-03-17 07:52:48 +11:00
cpu_setup_ppc970.S
cputable.c powerpc/tm: Abort syscalls in active transactions 2015-06-19 17:10:28 +10:00
crash_dump.c powerpc: Remove superfluous bootmem includes 2014-11-10 09:59:26 +11:00
crash.c powerpc/book3e/kdump: Enable crash_kexec_wait_realmode 2015-10-27 18:13:27 -05:00
dbell.c powerpc/powernv: Fixes for hypervisor doorbell handling 2015-03-20 14:51:53 +11:00
dma-iommu.c powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask 2015-07-13 10:10:55 +10:00
dma-swiotlb.c powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask 2015-07-13 10:10:55 +10:00
dma.c powerpc/dma: dma_set_coherent_mask() should not be GPL only 2015-10-28 14:20:50 +09:00
eeh_cache.c powerpc/eeh: fix start/end/flags type in struct pci_io_addr_range{} 2015-05-13 14:00:07 +10:00
eeh_dev.c powerpc/eeh: Create eeh_dev from pci_dn instead of device_node 2015-03-24 13:15:51 +11:00
eeh_driver.c Revert "powerpc/eeh: Don't unfreeze PHB PE after reset" 2015-12-09 14:05:10 +11:00
eeh_event.c powerpc/powernv: Fix killed EEH event 2014-06-11 17:04:33 +10:00
eeh_pe.c powerpc/eeh: Disable automatically blocked PCI config 2015-08-18 19:34:42 +10:00
eeh_sysfs.c powerpc/eeh: Fix PE state format 2014-11-27 09:32:58 +11:00
eeh.c powerpc/eeh: More relaxed condition for enabled IO path 2015-10-21 20:41:43 +11:00
entry_32.S powerpc/kernel: Change the do_syscall_trace_enter() API 2015-07-29 11:56:11 +10:00
entry_64.S powerpc/kernel: Change the do_syscall_trace_enter() API 2015-07-29 11:56:11 +10:00
epapr_hcalls.S
epapr_paravirt.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2014-06-10 18:54:22 -07:00
exceptions-64e.S powerpc/book3e: support CONFIG_RELOCATABLE 2015-10-27 18:13:27 -05:00
exceptions-64s.S powerpc: Non relocatable system call doesn't need a trampoline 2015-06-02 13:26:47 +10:00
fadump.c powerpc/fadump: Fix endianess issues in firmware assisted dump handling 2014-10-30 16:52:46 +11:00
firmware.c
fpu.S powerpc: Don't corrupt transactional state when using FP/VMX in kernel 2014-01-15 13:59:11 +11:00
fsl_booke_entry_mapping.S powerpc/fsl: Force coherent memory on e500mc derivatives 2015-08-07 23:00:01 -05:00
ftrace.c powerpc updates for 3.19 2014-12-11 17:48:14 -08:00
head_8xx.S powerpc/8xx: Implementation of PAGE_EXEC 2015-06-02 21:37:28 -05:00
head_32.S
head_40x.S powerpc: Remove check for CONFIG_SERIAL_TEXT_DEBUG 2014-06-11 16:31:21 +10:00
head_44x.S powerpc/ppc476: Disable BTAC 2014-08-13 15:13:42 +10:00
head_64.S powerpc/book3e: support CONFIG_RELOCATABLE 2015-10-27 18:13:27 -05:00
head_booke.h
head_fsl_booke.S powerpc/booke: Revert SPE/AltiVec common defines for interrupt numbers 2014-09-22 10:11:31 +02:00
hw_breakpoint.c powerpc: Replace __get_cpu_var uses 2014-11-03 12:12:32 +11:00
ibmebus.c powerpc: make of_device_ids const 2014-09-25 23:14:46 +10:00
idle_6xx.S
idle_book3e.S powerpc: No need to use dot symbols when branching to a function 2014-04-23 10:05:16 +10:00
idle_e500.S powerpc/e500mc: Remove dead L2 flushing code in idle_e500.S 2015-06-02 21:37:19 -05:00
idle_power4.S powerpc: No need to use dot symbols when branching to a function 2014-04-23 10:05:16 +10:00
idle_power7.S powerpc/powernv: Fix race in updating core_idle_state 2015-07-07 10:16:52 +10:00
idle.c
io-workarounds.c powerpc/mm: Differentiate between hugetlb and THP during page walk 2015-10-12 15:30:09 +11:00
io.c
iomap.c powerpc/kerenl: Enable EEH for IO accessors 2014-06-24 12:43:13 +10:00
iommu.c powerpc/iommu/powernv: Release replaced TCE 2015-06-11 15:16:49 +10:00
irq.c powerpc, irq: Use access helper irq_data_get_affinity_mask() 2015-09-15 17:06:28 +02:00
isa-bridge.c
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kgdb.c powerpc: Replace __get_cpu_var uses 2014-11-03 12:12:32 +11:00
kprobes.c powerpc: Replace __get_cpu_var uses 2014-11-03 12:12:32 +11:00
kvm_emul.S
kvm.c powerpc: Remove redundant breaks 2015-08-06 15:10:20 +10:00
l2cr_6xx.S
legacy_serial.c powerpc: make of_device_ids const 2014-09-25 23:14:46 +10:00
machine_kexec_32.c
machine_kexec_64.c powerpc/book3e-64: Enable kexec 2015-10-27 18:13:30 -05:00
machine_kexec.c powerpc: Fix endian issues in kexec and crash dump code 2014-02-11 11:24:52 +11:00
Makefile powerpc/ftrace: add powerpc timebase as a trace clock source 2015-08-06 16:36:23 +10:00
mce_power.c powerpc/book3s: Fix flush_tlb cpu_spec hook to take a generic argument. 2015-03-17 07:52:48 +11:00
mce.c powerpc/mce: fix off by one errors in mce event handling 2015-05-12 19:44:01 +10:00
misc_32.S atomic: Collapse all atomic_{set,clear}_mask definitions 2015-07-27 14:06:24 +02:00
misc_64.S powerpc/book3e-64: Enable kexec 2015-10-27 18:13:30 -05:00
misc.S powerpc: Rename __get_SP() to current_stack_pointer() 2014-10-15 11:23:20 +11:00
module_32.c powerpc: Use pr_fmt in module loader code 2014-10-02 17:33:54 +10:00
module_64.c powerpc: Use pr_fmt in module loader code 2014-10-02 17:33:54 +10:00
module.c
msi.c powerpc: Remove MSI-related PCI controller ops from ppc_md 2015-06-02 11:47:45 +10:00
nvram_64.c powerpc/nvram: Fix function name in some errors messages. 2015-10-02 22:55:05 +10:00
of_platform.c powerpc/eeh: Do probe on pci_dn 2015-03-24 13:15:52 +11:00
paca.c powerpc/book3e-64: Don't limit paca to 256 MiB 2015-10-27 18:13:28 -05:00
pci_32.c powerpc: Remove more traces of bootmem 2014-11-19 21:41:51 +11:00
pci_64.c powerpc updates for 3.19 2014-12-11 17:48:14 -08:00
pci_dn.c powerpc/powernv: Shift VF resource with an offset 2015-03-31 13:02:38 +11:00
pci_of_scan.c libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
pci-common.c powerpc/pci: export pcibios_free_controller() 2015-10-15 20:31:57 +11:00
pci-hotplug.c powerpc/pci: Add release_device() hook to phb ops 2015-06-03 13:27:15 +10:00
pmc.c
ppc32.h
ppc_ksyms_32.c powerpc: Separate ppc32 symbol exports into ppc_ksyms_32.c 2014-09-25 23:14:40 +10:00
ppc_ksyms.c powerpc: Rename __get_SP() to current_stack_pointer() 2014-10-15 11:23:20 +11:00
ppc_save_regs.S
proc_powerpc.c
process.c powerpc/tm: Check for already reclaimed tasks 2015-11-23 20:18:03 +11:00
prom_init_check.sh powerpc: Simplify symbol check in prom_init_check.sh 2014-09-25 23:14:46 +10:00
prom_init.c vTPM: get the buffer allocated for event log instead of the actual log 2015-10-19 01:01:23 +02:00
prom_parse.c
prom.c powerpc/prom: Use of_get_next_parent() in of_get_ibm_chip_id() 2015-10-28 12:08:32 +09:00
ptrace32.c
ptrace.c powerpc/kernel: Enable seccomp filter 2015-07-30 14:34:44 +10:00
reloc_32.S
reloc_64.S powerpc: Align p_dyn, p_rela and p_st symbols 2014-03-07 13:50:19 +11:00
rtas_flash.c powerpc: Fix endianness of flash_block_list in rtas_flash 2014-07-28 11:30:54 +10:00
rtas_pci.c powerpc: move find_and_init_phbs() to pSeries specific code 2015-04-11 20:49:09 +10:00
rtas-proc.c powerpc: LLVM complains about forward declaration of struct rtas_sensors 2014-11-10 09:59:32 +11:00
rtas-rtc.c
rtas.c powerpc/rtas: Validate rtas.entry before calling enter_rtas() 2015-10-22 11:03:25 +11:00
rtasd.c powerpc: Make a bunch of things static 2014-09-25 23:14:41 +10:00
setup_32.c powerpc32: memset: only use dcbz once cache is enabled 2015-09-17 10:36:53 +10:00
setup_64.c powerpc/book3e-64/kexec: Enable SMP release 2015-10-27 18:13:29 -05:00
setup-common.c powerpc: Convert power off logic to pm_power_off 2014-11-03 12:12:51 +11:00
signal_32.c powerpc/tm: Block signal return setting invalid MSR state 2015-11-23 20:06:31 +11:00
signal_64.c powerpc/tm: Block signal return setting invalid MSR state 2015-11-23 20:06:31 +11:00
signal.c powerpc: Use sigsp() 2014-08-06 13:04:32 +02:00
signal.h powerpc: Use get_signal() signal_setup_done() 2014-08-06 13:03:09 +02:00
smp-tbsync.c powerpc: Delete non-required instances of include <linux/init.h> 2014-01-15 13:46:44 +11:00
smp.c powerpc/smp: Wait until secondaries are active & online 2015-03-04 13:19:33 +11:00
stacktrace.c powerpc: Rename __get_SP() to current_stack_pointer() 2014-10-15 11:23:20 +11:00
suspend.c nosave: consolidate __nosave_{begin,end} in <asm/sections.h> 2014-10-09 22:26:04 -04:00
swsusp_32.S
swsusp_64.c
swsusp_asm64.S
swsusp_booke.S powerpc/fsl-booke: Use SPRN_SPRGn rather than mfsprg/mtsprg 2014-01-07 19:06:03 -06:00
swsusp.c
sys_ppc32.c
syscalls.c powerpc: Add a proper syscall for switching endianness 2015-03-28 22:03:40 +11:00
sysfs.c powerpc/dscr: Add some in-code documentation 2015-06-07 19:29:15 +10:00
systbl_chk.c powerpc: Add a proper syscall for switching endianness 2015-03-28 22:03:40 +11:00
systbl_chk.sh
systbl.S powerpc: Add a proper syscall for switching endianness 2015-03-28 22:03:40 +11:00
tau_6xx.c
time.c powerpc/time: Migrate to new 'set-state' interface 2015-08-10 11:41:02 +02:00
tm.S powerpc/kernel: Rename PACA_DSCR to PACA_DSCR_DEFAULT 2015-06-07 19:29:00 +10:00
trace_clock.c powerpc/ftrace: add powerpc timebase as a trace clock source 2015-08-06 16:36:23 +10:00
traps.c powerpc: Set the correct kernel taint on machine check errors. 2015-07-06 20:24:35 +10:00
udbg_16550.c powerpc: Fix bad NULL pointer check in udbg_uart_getc_poll() 2014-11-12 13:47:20 +11:00
udbg.c powerpc: Remove the celleb support 2015-04-07 17:15:13 +10:00
uprobes.c
vdso.c powerpc/vdso: Disable building the 32-bit VDSO on little endian 2015-05-11 20:01:02 +10:00
vecemu.c
vector.S powerpc: Change vrX register defines to vX to match gcc and glibc 2015-03-16 18:32:11 +11:00
vio.c powerpc: use for_each_sg() 2015-06-24 17:49:38 -07:00
vmlinux.lds.S powerpc: discard .exit.data at runtime 2015-10-15 20:31:59 +11:00