linux-stable.git/arch/powerpc, branch v4.9

Merge tag 'powerpc-4.9-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2016-12-05T18:30:12+00:00

Pull powerpc fixes from Michael Ellerman:
 "Four fixes, the first for code we merged this cycle and three that are
  also going to stable:

   - On 64-bit Book3E we were not placing the .text section where we
     said we would in the asm.

   - We broke building the boot wrapper on some 32-bit toolchains.

   - Lazy icache flushing was broken on pre-POWER5 machines.

   - One of the error paths in our EEH code would lead to a deadlock.

  Thanks to: Andrew Donnellan, Ben Hutchings, Benjamin Herrenschmidt,
  Nicholas Piggin"

* tag 'powerpc-4.9-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64: Fix placement of .text to be immediately following .head.text
  powerpc/eeh: Fix deadlock when PE frozen state can't be cleared
  powerpc/mm: Fix lazy icache flush on pre-POWER5
  powerpc/boot: Fix build failure in 32-bit boot wrapper

powerpc/64: Fix placement of .text to be immediately following .head.text

2016-12-01T11:26:31+00:00

Do not introduce any additional alignment. Placement of text section
will be set by fixed section macros. Without this, output section
alignment defaults to 4096, which makes BookE text section start at
0x1000 when it is expected to start at 0x100.

This was introduced by commit 57f266497d81 ("powerpc: Use gas sections
for arranging exception vectors") and was caught with the scripted head
section checker (not yet merged).

Fixes: 57f266497d81 ("powerpc: Use gas sections for arranging exception vectors")
Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc/eeh: Fix deadlock when PE frozen state can't be cleared

2016-12-01T11:26:27+00:00

In eeh_reset_device(), we take the pci_rescan_remove_lock immediately after
after we call eeh_reset_pe() to reset the PCI controller. We then call
eeh_clear_pe_frozen_state(), which can return an error. In this case, we
bail out of eeh_reset_device() without calling pci_unlock_rescan_remove().

Add a call to pci_unlock_rescan_remove() in the eeh_clear_pe_frozen_state()
error path so that we don't cause a deadlock later on.

Reported-by: Pradipta Ghosh 
Fixes: 78954700631f ("powerpc/eeh: Avoid I/O access during PE reset")
Cc: stable@vger.kernel.org # v3.16+
Signed-off-by: Andrew Donnellan 
Acked-by: Russell Currey 
Signed-off-by: Michael Ellerman

powerpc/mm: Fix lazy icache flush on pre-POWER5

2016-11-29T12:59:40+00:00

On 64-bit CPUs with no-execute support and non-snooping icache, such as
970 or POWER4, we have a software mechanism to ensure coherency of the
cache (using exec faults when needed).

This was broken due to a logic error when the code was rewritten
from assembly to C, previously the assembly code did:

  BEGIN_FTR_SECTION
         mr      r4,r30
         mr      r5,r7
         bl      hash_page_do_lazy_icache
  END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE)

Which tests that:
   (cpu_features & (NOEXECUTE | COHERENT_ICACHE)) == NOEXECUTE

Which says that the current cpu does have NOEXECUTE, but does not have
COHERENT_ICACHE.

Fixes: 91f1da99792a ("powerpc/mm: Convert 4k hash insert to C")
Fixes: 89ff725051d1 ("powerpc/mm: Convert __hash_page_64K to C")
Fixes: a43c0eb8364c ("powerpc/mm: Convert 4k insert from asm to C")
Cc: stable@vger.kernel.org # v4.5+
Signed-off-by: Benjamin Herrenschmidt 
Reviewed-by: Aneesh Kumar K.V 
[mpe: Change log verbosification]
Signed-off-by: Michael Ellerman

powerpc/boot: Fix build failure in 32-bit boot wrapper

2016-11-28T11:58:13+00:00

OPAL is not callable from 32-bit mode and the assembly code for it
may not even build (depending on how binutils was configured).

References: https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpcspe&ver=4.8.7-1&stamp=1479203712
Fixes: 656ad58ef19e ("powerpc/boot: Add OPAL console to epapr wrappers")
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Ben Hutchings 
Signed-off-by: Michael Ellerman

Merge tag 'powerpc-4.9-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2016-11-26T19:24:03+00:00

Pull powerpc fixes from Michael Ellerman:
 "Fixes marked for stable:
   - Set missing wakeup bit in LPCR on POWER9
   - Fix the early OPAL console wrappers
   - Fixup kernel read only mapping

  Fixes for code merged this cycle:
   - Fix missing CRCs, add more asm-prototypes.h declarations"

* tag 'powerpc-4.9-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm: Fixup kernel read only mapping
  powerpc/boot: Fix the early OPAL console wrappers
  powerpc: Fix missing CRCs, add more asm-prototypes.h declarations
  powerpc: Set missing wakeup bit in LPCR on POWER9

powerpc/mm: Fixup kernel read only mapping

2016-11-25T03:18:25+00:00

With commit e58e87adc8bf9 ("powerpc/mm: Update _PAGE_KERNEL_RO") we
started using the ppp value 0b110 to map kernel readonly. But that
facility was only added as part of ISA 2.04. For earlier ISA version
only supported ppp bit value for readonly mapping is 0b011. (This
implies both user and kernel get mapped using the same ppp bit value for
readonly mapping.).
Update the code such that for earlier architecture version we use ppp
value 0b011 for readonly mapping. We don't differentiate between power5+
and power5 here and apply the new ppp bits only from power6 (ISA 2.05).
This keep the changes minimal.

This fixes issue with PS3 spu usage reported at
https://lkml.kernel.org/r/rep.1421449714.geoff@infradead.org

Fixes: e58e87adc8bf9 ("powerpc/mm: Update _PAGE_KERNEL_RO")
Cc: stable@vger.kernel.org # v4.7+
Tested-by: Geoff Levand 
Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Michael Ellerman

powerpc/boot: Fix the early OPAL console wrappers

2016-11-24T06:34:01+00:00

When configured with CONFIG_PPC_EARLY_DEBUG_OPAL=y the kernel expects
the OPAL entry and base addresses to be passed in r8 and r9
respectively. Currently the wrapper does not attempt to restore these
values before entering the decompressed kernel which causes the kernel
to branch into whatever happens to be in r9 when doing a write to the
OPAL console in early boot.

This patch adds a platform_ops hook that can be used to branch into the
new kernel. The OPAL console driver patches this at runtime so that if
the console is used it will be restored just prior to entering the
kernel.

Fixes: 656ad58ef19e ("powerpc/boot: Add OPAL console to epapr wrappers")
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Oliver O'Halloran 
Signed-off-by: Michael Ellerman

powerpc: Fix missing CRCs, add more asm-prototypes.h declarations

2016-11-22T11:25:41+00:00

After patch 4efca4ed0 ("kbuild: modversions for EXPORT_SYMBOL() for asm"),
asm exports can get modversions CRCs generated if they have C definitions
in asm-prototypes.h. This patch adds missing definitions for 32 and 64 bit
allmodconfig builds.

Fixes: 9445aa1a3062 ("ppc: move exports to definitions")
Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman

powerpc: Set missing wakeup bit in LPCR on POWER9

2016-11-22T03:53:27+00:00

There is a new bit, LPCR_PECE_HVEE (Hypervisor Virtualization Exit
Enable), which controls wakeup from STOP states on Hypervisor
Virtualization Interrupts (which happen to also be all external
interrupts in host or bare metal mode).

It needs to be set or we will miss wakeups.

Fixes: 9baaef0a22c8 ("powerpc/irq: Add support for HV virtualization interrupts")
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Benjamin Herrenschmidt 
[mpe: Rename it to HVEE to match the name in the ISA]
Signed-off-by: Michael Ellerman