Similar to BLK regions, publish new seed namespace devices to allow
unused PMEM region capacity to be consumed by additional namespaces.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Now that the rest of the infrastructure has been converted to handle
multi-pmem configurations, lift the artificial barrier at scan time.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Short-circuit doomed-to-fail label validation attempts by skipping
labels that are outside the given region.  For example a DIMM that has
multiple PMEM regions will waste time attempting to create namespaces
only to find that the interleave-set-cookie does not validate, e.g.:

    nd_region region6: invalid cookie in label: 73e608dc-47b9-4b2a-b5c7-2d55a32e0c2

Similar to how we skip BLK labels when performing PMEM validation we can
skip out-of-range labels early.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Now that we have nd_region_available_dpa() able to handle the presence
of multiple PMEM allocations in aliased PMEM regions, reuse that same
infrastructure to track allocations from free space.  In particular
handle allocating from an aliased PMEM region in the case where there
are dis-contiguous holes.  The allocation for BLK and PMEM are
documented in the space_valid() helper:

    BLK-space is valid as long as it does not precede a PMEM
    allocation in a given region. PMEM-space must be contiguous
    and adjacent to an existing existing allocation (if one
    exists).
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Instead of assuming that there will only ever be one allocated range at
the start of the region, account for additional namespaces that might
start at an offset from the region base.

After this change pmem namespaces now have a reason to carry an array of
resources similar to blk.  Unifying the resource tracking infrastructure
in nd_namespace_common is a future cleanup candidate.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

pmem devices are currently named /dev/pmem<region-index>. Preserve the
naming of the 0th device, but add a ".<namespace-index>" for other
devices.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

The free dpa (dimm-physical-address) space calculation reports how much
free space is available with consideration for aliased BLK + PMEM
regions.  Recall that BLK capacity is allocated from high addresses and
PMEM is allocated from low addresses in their respective regions.

nd_region_available_dpa() accounts for the fact that the largest
encroachment (lowest starting address) into PMEM capacity by a BLK
allocation limits the available capacity to that point, regardless if
there is BLK allocation hole at a higher address.  Similarly, for the
multi-pmem case we need to track the largest encroachment (highest
 ending address) of a PMEM allocation in BLK capacity regardless of
whether there is an allocation hole that a BLK allocation could fill at
a lower address.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Add more determinism to initial namespace device-name assignments by
sorting the namespaces by starting dpa.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

If label scanning finds multiple valid pmem namespaces allow them to be
surfaced rather than fail namespace scanning. Support for creating
multiple namespaces per region is saved for a later patch.

Note that this adds some new error messages to clarify which of the pmem
namespaces in the set are potentially impacted by invalid labels.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Update nfit_test to handle multiple sub-allocations within a given pmem
region.  The mock resource now tracks and un-tracks sub-ranges as they
are requested and released (either explicitly or via devm callback).
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

In preparation for allowing multiple namespace per pmem region, unify
blk and pmem label scanning.  Given that blk regions already support
multiple namespaces, teaching that path how to do pmem namespace
scanning is an incremental step towards multiple pmem namespace support.
This should be functionally equivalent to the previous state in that
stops after finding the first valid pmem label set.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

The ability to translate a generic struct device pointer into a
namespace uuid is a useful utility as we go to unify the blk and pmem
label scanning paths.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

In preparation for enabling multiple namespaces per pmem region, convert
the label tracking to use a linked list.  In particular this will allow
select_pmem_id() to move labels from the unvalidated state to the
validated state.  Currently we only track one validated set per-region.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Before we add more libnvdimm-private fields to nd_mapping make it clear
which parameters are input vs libnvdimm internals. Use struct
nd_mapping_desc instead of struct nd_mapping in nd_region_desc and make
struct nd_mapping private to libnvdimm.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Existing implemenetation writes to all the flush hint addresses for a
given ND region. This is not necessary as the flushes are per imc and
not per DIMM. Search the mappings and clear out the duplicates at init
to avoid multiple flush to the same imc.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

nvdimm_clear_poison cleared the user-visible badblocks, and sent
commands to the NVDIMM to clear the areas marked as 'poison', but it
neglected to clear the same areas from the internal poison_list which is
used to marshal ARS results before sorting them by namespace. As a
result, once on-demand ARS functionality was added:

37b137ff nfit, libnvdimm: allow an ARS scrub to be triggered on demand

A scrub triggered from either sysfs or an MCE was found to be adding
stale entries that had been cleared from gendisk->badblocks, but were
still present in nvdimm_bus->poison_list. Additionally, the stale entries
could be triggered into producing stale disk->badblocks by simply disabling
and re-enabling the namespace or region.

This adds the missing step of clearing poison_list entries when clearing
poison, so that it is always in sync with badblocks.

Fixes: 37b137ff ("nfit, libnvdimm: allow an ARS scrub to be triggered on demand")
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

pmem_do_bvec used to kmap_atomic at the begin, and only unmap at the
end. Things like nvdimm_clear_poison may want to do nvdimm subsystem
bookkeeping operations that may involve taking locks or doing memory
allocations, and we can't do that from the atomic context. Reduce the
atomic context to just what needs it - the memcpy to/from pmem.

Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Starting a full Address Range Scrub (ARS) on hitting a memory error
machine check exception may not always be desirable. Provide a way
through sysfs to toggle the behavior between just adding the address
(cache line) where the MCE happened to the poison list and doing a full
scrub. The former (selective insertion of the address) is done
unconditionally.

Cc: linux-acpi@vger.kernel.org
Cc: Linda Knippers <linda.knippers@hpe.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

The definition of the flush hint table as:

	void __iomem *flush_wpq[0][0];

...passed the unit test, but is broken as flush_wpq[0][1] and
flush_wpq[1][0] refer to the same entry.  Fix this to use a helper that
calculates a slot in the table based on the geometry of flush hints in
the region.  This is important to get right since virtualization
solutions use this mechanism to trigger hypervisor flushes to platform
persistence.
Reported-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

If platform firmware fails to populate unique / non-zero serial number
data for each nvdimm in an interleave-set it may cause pmem region
initialization to fail.  Add a debug message for this case.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Add an nfit_test specific attribute for gating whether a get_config_size
DSM, or any DSM for that matter, succeeds or fails.  The get_config_size
DSM is initial motivation since that is the first command libnvdimm core
issues to determine the state of the namespace label area.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

For the DSMs where the kernel knows the format of the output buffer and
originates those DSMs from within the kernel, return -EIO for any
non-zero status.  If the BIOS is indicating a status that we do not know
how to handle, fail the DSM.

Cc: <stable@vger.kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

The internal alloc_nvdimm_map() helper might fail, particularly if the
memory region is already busy.  Report request_mem_region() failures and
check for the failure.
Reported-by: Ryan Chen <ryan.chan105@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Commit 480b6837 "nvdimm: fix PHYS_PFN/PFN_PHYS mixup" identified
that we were passing an invalid address to devm_nvdimm_ioremap(). With
that fixed it exposed a bug in the memory reservation size for flush
hint tables.  Since we map a full page we need to mock a full page of
memory to back the flush hint table entries.

Cc: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

nd_activate_region() iomaps any hint addresses required when activating
a region. To prevent duplicate mappings it checks the PFN of the hint to
be mapped against the PFNs of the already mapped hints. Unfortunately it
doesn't convert the PFN back into a physical address before passing it
to devm_nvdimm_ioremap(). Instead it applies PHYS_PFN a second time
which ends about as well as you would imagine.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Pull USB fixes from Greg KH:
 "Here are two small fixes, and one new device id, for 4.8-rc7

  The fixes solve a build error that was reported in your tree for the
  blackfin arch, and resolve an issue with a number of broken USB
  devices that reported the wrong interval rate.  Included here is also
  a new device id for the usb-serial driver.

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

* tag 'usb-4.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  USB: change bInterval default to 10 ms
  usb: musb: Fix tusb6010 compile error on blackfin
  USB: serial: simple: add support for another Infineon flashloader

Merge tag 'fixes-for-linus-v4.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull uaccess fixes from Guenter Roeck:
 "Two patches fixing problems introduced with copy_from_user changes"

* tag 'fixes-for-linus-v4.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  openrisc: fix the fix of copy_from_user()
  avr32: fix 'undefined reference to `___copy_from_user'

Pull perf fixes from Thomas Gleixner:
 "A couple of small fixes to x86 perf drivers:

   - Measure L2 for HW_CACHE* events on AMD

   - Fix the address filter handling in the intel/pt driver

   - Handle the BTS disabling at the proper place"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/amd: Make HW_CACHE_REFERENCES and HW_CACHE_MISSES measure L2
  perf/x86/intel/pt: Do validate the size of a kernel address filter
  perf/x86/intel/pt: Fix kernel address filter's offset validation
  perf/x86/intel/pt: Fix an off-by-one in address filter configuration
  perf/x86/intel: Don't disable "intel_bts" around "intel" event batching

Pull SMP build fixlet from Thomas Gleixner:
 "Add a missing include in cpuhotplug.h"

* 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Include linux/types.h in linux/cpuhotplug.h

Pull irq fixes from Thomas Gleixner:
 "Two patches from Boris which address a potential deadlock in the atmel
  irq chip driver"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/atmel-aic: Fix potential deadlock in ->xlate()
  genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers

Since commit acb2505d ("openrisc: fix copy_from_user()"),
copy_from_user() returns the number of bytes requested, not the
number of bytes not copied.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Fixes: acb2505d ("openrisc: fix copy_from_user()")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

avr32 builds fail with:

arch/avr32/kernel/built-in.o: In function `arch_ptrace':
(.text+0x650): undefined reference to `___copy_from_user'
arch/avr32/kernel/built-in.o:(___ksymtab+___copy_from_user+0x0): undefined
reference to `___copy_from_user'
kernel/built-in.o: In function `proc_doulongvec_ms_jiffies_minmax':
(.text+0x5dd8): undefined reference to `___copy_from_user'
kernel/built-in.o: In function `proc_dointvec_minmax_sysadmin':
sysctl.c:(.text+0x6174): undefined reference to `___copy_from_user'
kernel/built-in.o: In function `ptrace_has_cap':
ptrace.c:(.text+0x69c0): undefined reference to `___copy_from_user'
kernel/built-in.o:ptrace.c:(.text+0x6b90): more undefined references to
`___copy_from_user' follow

Fixes: 8630c322 ("avr32: fix copy_from_user()")
Cc: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Havard Skinnemoen <hskinnemoen@gmail.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

... by turning it into what used to be multipages counterpart

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull MMC fixes from Ulf Hansson:
 "MMC host:
   - omap/omap_hsmmc: Initialize dma_slave_config to avoid random data
   - sdhci-st: Handle interconnect clock"

* tag 'mmc-v4.8-rc6' of git://git.linaro.org/people/ulf.hansson/mmc:
  mmc: omap: Initialize dma_slave_config to avoid random data in it's fields
  mmc: omap_hsmmc: Initialize dma_slave_config to avoid random data
  mmc: sdhci-st: Handle interconnect clock
  dt-bindings: mmc: sdhci-st: Mention the discretionary "icn" clock

Pull powerpc fixes from Michael Ellerman:
 "Fixes for code merged this cycle:

   - Fix restore of SPRs upon wake up from hypervisor state loss from
     Gautham R  Shenoy
   - Fix the state of root PE from Gavin Shan
   - Detach from PE on releasing PCI device from Gavin Shan
   - Fix size of NUM_CPU_FTR_KEYS on 32-bit
   - Fix missed TCE invalidations that should fallback to OPAL"

* tag 'powerpc-4.8-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/powernv/pci: Fix missed TCE invalidations that should fallback to OPAL
  powerpc/powernv: Detach from PE on releasing PCI device
  powerpc/powernv: Fix the state of root PE
  powerpc/kernel: Fix size of NUM_CPU_FTR_KEYS on 32-bit
  powerpc/powernv: Fix restore of SPRs upon wake up from hypervisor state loss

Pull cifs fixes from Steve French:
 "Small set of cifs fixes"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  Move check for prefix path to within cifs_get_root()
  Compare prepaths when comparing superblocks
  Fix memory leaks in cifs_do_mount()

Pull nfsd bugfix from Bruce Fields:
 "Fix a memory corruption bug that I introduced in 4.7"

* tag 'nfsd-4.8-2' of git://linux-nfs.org/~bfields/linux:
  svcauth_gss: Revert 64c59a37 ("Remove unnecessary allocation")