Use the early sclp code to provide a boot console. This boot console
is available if the kernel parameter "earlyprintk" has been specified,
just like it works for other architectures that also provide an early
boot console.

This makes debugging of early problems much easier, since now we
finally have working console output even before memory detection is
running.

The boot console will be automatically disabled as soon as another
console will be registered.
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Make sure the _sclp_print_lm function stays within bounds of the early
sccb, even if the passed string is very long.  If the string is too
long, the remaining characters will be dropped.
Suggested-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Make the early sclp interrupt handler more robust:

- disable all interrupt sub classes except for the service signal subclass
- extend ctlreg0 union so it is easily possible to set the service signal
  subclass mask bit without using a magic number
- disable lowcore protection before writing to it
- make sure that all write accesses are done before the original content
  of control register 0 is restored, which could enable lowcore protection
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

The "topology=off" kernel parameter is supposed to prevent the kernel
to use hardware topology information to generate scheduling domains
etc.
For an unknown reason I implemented this in a very odd way back then:
instead of simply clearing the MACHINE_HAS_TOPOLOGY flag within the
lowcore I added a second variable which indicated that topology
information should not be used. This is more than suboptimal since it
partially doesn't work.  For the fake NUMA case topology information
is still considered and scheduling domains will be created based on
this.
To fix this and to simplify the code get rid of the extra variable and
implement the "topology=off" case like it is done for other features.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Yet another trivial patch to reduce the noise that coccinelle
generates.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Remove a couple of unneeded semicolons. This is just to reduce the
noise that the coccinelle static code checker generates.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Merge the seven printks within topology_init_early to a single one.
With an early boot console this avoids printing six lines each
containing only a single character.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Fix a long-standing but currently irrelevant bug: the memory detection
code performs a tprot instruction on address zero to figure out if the
first memory chunk is readable or writable. Due to low address
protection the result is "read-only". If the memory detection code
would actually care, it would have to ignore the first memory
increment, but it adds the memory increment to writable memory anyway.

If memblock debugging is enabled this leads to an extra rather
surprising call which registers memory. To avoid this get rid of the
first misleading tprot call and simply assume that the first memory
increment is writable. Otherwise we wouldn't have reached the memory
detection code anyway.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

The s390 specific memory detection code does not call memblock_add,
which would generate debug output if memblock=debug is specified on
the kernel command line. Instead it directly calls memblock_add_range,
which doesn't generate any debug output.
To have a chance to debug early memblock related bugs add an s390
specific memblock_dbg call and a (missing) memblock_dump_all call.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

reserve_initrd currently calls memblock_reserve even if the to be
reserved size is zero. Even though the memblock core code can handle
this correctly, it still yields confusing debug messages if
memblock debugging is enabled.
Therefore make sure to not call memblock_reserve with a size of zero.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Add proper annotation to the bar definition and use casts within the
bus accessors. Also change the sequence in the accessors to do the
shifts in the native byte order. No functional change.
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Keep sparse and other static code checkers from emitting warnings like:

arch/s390/kernel/ipl.c:1549:14: warning: incorrect type in assignment (different base types)
arch/s390/kernel/ipl.c:1549:14:    expected unsigned int [unsigned] csum
arch/s390/kernel/ipl.c:1549:14:    got restricted __wsum

All usages in s390 code are ok. Therefore add proper casts.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/zcore.c does not contain any miscdevice so the
inclusion of linux/miscdevice.h is uncessary.
Signed-off-by: NCorentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Remove an unused member of struct channel subsystem.
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Simplify error handling during css initialization by moving the error
handling code to setup_css (which now cleans up after itself).

Also remove the odd special cleanup handling of the pseudo_subchannel.
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Cleanup the code to handle the css device attribute. Move everything
to an attribute group to let the driver core handle attribute
creation and removal.
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Obtain the real channel subsystem id and use that for the generation
of a unique path group id. Note that this change does not affect the
channel subsystem id as used in the user-visible naming of subchannels
and friends.
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: NDong Jia Shi <bjsdjshik@linux.vnet.ibm.com>
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Currently the cssid in various structures is used as the id of
the respective channel subsystem. Sometimes however we call the
index in the channel_subsystems array cssid. In some places the
id is even used as the index.

Provide a new define MAX_CSS_IDX and use it where appropriate.
In addition to that provide a dummy function to find a channel
subsystem by its id and a macro to iterate over the channel
subsystems.
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: NPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

The variable length arrays used to specify clobbered memory within
ap_nqap and ap_dqap would only work if the length would be known at
compile time.
This is not the case for both usages. Therefore simply use a full
memory clobber and get rid of the old construct.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Get rid of these:
drivers/s390/crypto/ap_card.c:140:20:
  warning: symbol 'ap_card_type' was not declared. Should it be static?
drivers/s390/crypto/ap_queue.c:567:20:
 warning: symbol 'ap_queue_type' was not declared. Should it be static?
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Use a flexible array instead. The size of the structure is not used
within chsc_sstpi, therefore no change in semantics but one less
sparse warning:

drivers/s390/cio/chsc.c:1219:27: warning: Variable length array is used.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Improve the memmove implementation to save one instruction and use
better label names. Also use better label names for the memset and
memcpy implementations so everything looks consistent.
Suggested-by: NJens Remus <jremus@linux.vnet.ibm.com>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

The stcctm5 inline assembly uses a variable length array to specify
the memory that is written to.  According to the gcc manual this trick
only works if the length is known at compile time. This is not the the
case for the stccm5 inline assembly.

Therefore simply use a full memory clobber. As requested by Martin
also move the output Q constraint operand to the input operands list,
since all we want is that the compiler generates an instruction that
may use the displacement field: in other words we only need the
address of *val. That the inline assembly actually writes to an array
starting at val is taken care of with the memory clobber.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>

We have quite a lot of code that depends on the order of the
__ctl_load inline assemby and subsequent memory accesses, like
e.g. disabling lowcore protection and the writing to lowcore.

Since the __ctl_load macro does not have memory barrier semantics, nor
any other dependencies the compiler is, theoretically, free to shuffle
code around. Or in other words: storing to lowcore could happen before
lowcore protection is disabled.

In order to avoid this class of potential bugs simply add a full
memory barrier to the __ctl_load macro.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Pull namespace fixes from Eric Biederman:
 "This tree contains 4 fixes.

  The first is a fix for a race that can causes oopses under the right
  circumstances, and that someone just recently encountered.

  Past that are several small trivial correct fixes. A real issue that
  was blocking development of an out of tree driver, but does not appear
  to have caused any actual problems for in-tree code. A potential
  deadlock that was reported by lockdep. And a deadlock people have
  experienced and took the time to track down caused by a cleanup that
  removed the code to drop a reference count"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  sysctl: Drop reference added by grab_header in proc_sys_readdir
  pid: fix lockdep deadlock warning due to ucount_lock
  libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount
  mnt: Protect the mountpoint hashtable with mount_lock

Pull char/misc driver fixes from Greg KH:
 "Here are some small char/misc driver fixes for 4.10-rc4 that resolve
  some reported issues.

  The MEI driver issue resolves a lot of problems that people have been
  having, as does the mem driver fix. The other minor fixes resolve
  other reported issues.

  All of these have been in linux-next for a while"

* tag 'char-misc-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  vme: Fix wrong pointer utilization in ca91cx42_slave_get
  auxdisplay: fix new ht16k33 build errors
  ppdev: don't print a free'd string
  extcon: return error code on failure
  drivers: char: mem: Fix thinkos in kmem address checks
  mei: bus: enable OS version only for SPT and newer

Merge tag 'driver-core-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fix from Greg KH:
 "Here is a single patch being reverted to remove a feature that was
  added in 4.10-rc1 that isn't quite ready for release.

  It will be redone as a debugfs file instead of a sysfs file in the
  future"

* tag 'driver-core-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  Revert "driver core: Add deferred_probe attribute to devices in sysfs"

Pull tty/serial fixes from Greg KH:
 "Here are some small tty/serial driver fixes for 4.10-rc4 to resolve a
  number of reported issues.

  Nothing major here at all, one revert of a problematic patch, and some
  other tiny bugfixes. Full details are in the shortlog below.

  All have been in linux-next with no reported issues"

* tag 'tty-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  sysrq: attach sysrq handler correctly for 32-bit kernel
  Revert "tty: serial: 8250: add CON_CONSDEV to flags"
  Clearing FIFOs in RS485 emulation mode causes subsequent transmits to break
  8250_pci: Fix potential use-after-free in error path
  tty/serial: atmel: RS485 half duplex w/DMA: enable RX after TX is done
  tty/serial: atmel_serial: BUG: stop DMA from transmitting in stop_tx

Pull USB fixes from Greg KH:
 "Here are a few small USB driver fixes for 4.10-rc4 to resolve some
  reported issues.

  The "largest" here is a number of bugs being fixed in the ch341
  usb-serial driver, to hopefully resolve the mess of different devices
  floating around that use this driver that have been having problems
  with the 4.10-rc1 release.

  There's also a tiny musb fix that I missed in the last pull request,
  as well as the traditional xhci fix rounding out the batch.

  All have been in linux-next with no reported issues"

* tag 'usb-4.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  xhci: fix deadlock at host remove by running watchdog correctly
  USB: serial: ch341: fix control-message error handling
  usb: musb: fix runtime PM in debugfs
  wusbcore: Fix one more crypto-on-the-stack bug
  USB: serial: kl5kusb105: fix line-state error handling
  USB: serial: ch341: fix baud rate and line-control handling
  USB: serial: ch341: fix line settings after reset-resume
  USB: serial: ch341: fix resume after reset
  USB: serial: ch341: fix open error handling
  USB: serial: ch341: fix modem-control and B0 handling
  USB: serial: ch341: fix open and resume after B0
  USB: serial: ch341: fix initial modem-control state

Pull i2c fixes from Wolfram Sang:
 "Bugfixes for I2C. Mostly core this time which is a bit unusual but
  nothing really scary in there"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: piix4: Avoid race conditions with IMC
  i2c: fix spelling mistake: "insufficent" -> "insufficient"
  i2c: print correct device invalid address
  i2c: do not enable fall back to Host Notify by default
  i2c: fix kernel memory disclosure in dev interface

Pull x86 fixes from Ingo Molnar:
 "Misc fixes:

   - unwinder fixes
   - AMD CPU topology enumeration fixes
   - microcode loader fixes
   - x86 embedded platform fixes
   - fix for a bootup crash that may trigger when clearcpuid= is used
     with invalid values"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mpx: Use compatible types in comparison to fix sparse error
  x86/tsc: Add the Intel Denverton Processor to native_calibrate_tsc()
  x86/entry: Fix the end of the stack for newly forked tasks
  x86/unwind: Include __schedule() in stack traces
  x86/unwind: Disable KASAN checks for non-current tasks
  x86/unwind: Silence warnings for non-current tasks
  x86/microcode/intel: Use correct buffer size for saving microcode data
  x86/microcode/intel: Fix allocation size of struct ucode_patch
  x86/microcode/intel: Add a helper which gives the microcode revision
  x86/microcode: Use native CPUID to tickle out microcode revision
  x86/CPU: Add native CPUID variants returning a single datum
  x86/boot: Add missing declaration of string functions
  x86/CPU/AMD: Fix Bulldozer topology
  x86/platform/intel-mid: Rename 'spidev' to 'mrfld_spidev'
  x86/cpu: Fix typo in the comment for Anniedale
  x86/cpu: Fix bootup crashes by sanitizing the argument of the 'clearcpuid=' command-line option

Pull NOHZ fix from Ingo Molnar:
 "This fixes an old NOHZ race where we incorrectly calculate the next
  timer interrupt in certain circumstances where hrtimers are pending,
  that can cause hard to reproduce stalled-values artifacts in
  /proc/stat"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  nohz: Fix collision between tick and other hrtimers

Pull perf fixes from Ingo Molnar:
 "Misc race fixes uncovered by fuzzing efforts, a Sparse fix, two PMU
  driver fixes, plus miscellanous tooling fixes"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86: Reject non sampling events with precise_ip
  perf/x86/intel: Account interrupts for PEBS errors
  perf/core: Fix concurrent sys_perf_event_open() vs. 'move_group' race
  perf/core: Fix sys_perf_event_open() vs. hotplug
  perf/x86/intel: Use ULL constant to prevent undefined shift behaviour
  perf/x86/intel/uncore: Fix hardcoded socket 0 assumption in the Haswell init code
  perf/x86: Set pmu->module in Intel PMU modules
  perf probe: Fix to probe on gcc generated symbols for offline kernel
  perf probe: Fix --funcs to show correct symbols for offline module
  perf symbols: Robustify reading of build-id from sysfs
  perf tools: Install tools/lib/traceevent plugins with install-bin
  tools lib traceevent: Fix prev/next_prio for deadline tasks
  perf record: Fix --switch-output documentation and comment
  perf record: Make __record_options static
  tools lib subcmd: Add OPT_STRING_OPTARG_SET option
  perf probe: Fix to get correct modname from elf header
  samples/bpf trace_output_user: Remove duplicate sys/ioctl.h include
  samples/bpf sock_example: Avoid getting ethhdr from two includes
  perf sched timehist: Show total scheduling time

Pull EFI fixes from Ingo Molnar:
 "A number of regression fixes:

   - Fix a boot hang on machines that have somewhat unusual memory map
     entries of phys_addr=0x0 num_pages=0, which broke due to a recent
     commit. This commit got cherry-picked from the v4.11 queue because
     the bug is affecting real machines.

   - Fix a boot hang also reported by KASAN, caused by incorrect init
     ordering introduced by a recent optimization.

   - Fix a recent robustification fix to allocate_new_fdt_and_exit_boot()
     that introduced an invalid assumption. Neither bugs were seen in
     the wild AFAIK"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/x86: Prune invalid memory map entries and fix boot regression
  x86/efi: Don't allocate memmap through memblock after mm_init()
  efi/libstub/arm*: Pass latest memory map to the kernel

Pull vfs fixes from Al Viro.

The most notable fix here is probably the fix for a splice regression
("fix a fencepost error in pipe_advance()") noticed by Alan Wylie.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fix a fencepost error in pipe_advance()
  coredump: Ensure proper size of sparse core files
  aio: fix lock dep warning
  tmpfs: clear S_ISGID when setting posix ACLs

Pull block fixes from Jens Axboe:

 - the virtio_blk stack DMA corruption fix from Christoph, fixing and
   issue with VMAP stacks.

 - O_DIRECT blkbits calculation fix from Chandan.

 - discard regression fix from Christoph.

 - queue init error handling fixes for nbd and virtio_blk, from Omar and
   Jeff.

 - two small nvme fixes, from Christoph and Guilherme.

 - rename of blk_queue_zone_size and bdev_zone_size to _sectors instead,
   to more closely follow what we do in other places in the block layer.
   This interface is new for this series, so let's get the naming right
   before releasing a kernel with this feature. From Damien.

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: don't try to discard from __blkdev_issue_zeroout
  sd: remove __data_len hack for WRITE SAME
  nvme: use blk_rq_payload_bytes
  scsi: use blk_rq_payload_bytes
  block: add blk_rq_payload_bytes
  block: Rename blk_queue_zone_size and bdev_zone_size
  nvme: apply DELAY_BEFORE_CHK_RDY quirk at probe time too
  nvme-rdma: fix nvme_rdma_queue_is_ready
  virtio_blk: fix panic in initialization error path
  nbd: blk_mq_init_queue returns an error code on failure, not NULL
  virtio_blk: avoid DMA to stack for the sense buffer
  do_direct_IO: Use inode->i_blkbits to compute block count to be cleaned

The logics in pipe_advance() used to release all buffers past the new
position failed in cases when the number of buffers to release was equal
to pipe->buffers.  If that happened, none of them had been released,
leaving pipe full.  Worse, it was trivial to trigger and we end up with
pipe full of uninitialized pages.  IOW, it's an infoleak.

Cc: stable@vger.kernel.org # v4.9
Reported-by: N"Alan J. Wylie" <alan@wylie.me.uk>
Tested-by: N"Alan J. Wylie" <alan@wylie.me.uk>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>