Merge tag 'libnvdimm-for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm updates from Dan Williams:
 "libnvdimm updates for the latest ACPI and UEFI specifications. This
  pull request also includes new 'struct dax_operations' enabling to
  undo the abuse of copy_user_nocache() for copy operations to pmem.

  The dax work originally missed 4.12 to address concerns raised by Al.

  Summary:

   - Introduce the _flushcache() family of memory copy helpers and use
     them for persistent memory write operations on x86. The
     _flushcache() semantic indicates that the cache is either bypassed
     for the copy operation (movnt) or any lines dirtied by the copy
     operation are written back (clwb, clflushopt, or clflush).

   - Extend dax_operations with ->copy_from_iter() and ->flush()
     operations. These operations and other infrastructure updates allow
     all persistent memory specific dax functionality to be pushed into
     libnvdimm and the pmem driver directly. It also allows dax-specific
     sysfs attributes to be linked to a host device, for example:
     /sys/block/pmem0/dax/write_cache

   - Add support for the new NVDIMM platform/firmware mechanisms
     introduced in ACPI 6.2 and UEFI 2.7. This support includes the v1.2
     namespace label format, extensions to the address-range-scrub
     command set, new error injection commands, and a new BTT
     (block-translation-table) layout. These updates support inter-OS
     and pre-OS compatibility.

   - Fix a longstanding memory corruption bug in nfit_test.

   - Make the pmem and nvdimm-region 'badblocks' sysfs files poll(2)
     capable.

   - Miscellaneous fixes and small updates across libnvdimm and the nfit
     driver.

  Acknowledgements that came after the branch was pushed: commit
  6aa734a2f38e ("libnvdimm, region, pmem: fix 'badblocks'
  sysfs_get_dirent() reference lifetime") was reviewed by Toshi Kani
  <toshi.kani@hpe.com>"

* tag 'libnvdimm-for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (42 commits)
  libnvdimm, namespace: record 'lbasize' for pmem namespaces
  acpi/nfit: Issue Start ARS to retrieve existing records
  libnvdimm: New ACPI 6.2 DSM functions
  acpi, nfit: Show bus_dsm_mask in sysfs
  libnvdimm, acpi, nfit: Add bus level dsm mask for pass thru.
  acpi, nfit: Enable DSM pass thru for root functions.
  libnvdimm: passthru functions clear to send
  libnvdimm, btt: convert some info messages to warn/err
  libnvdimm, region, pmem: fix 'badblocks' sysfs_get_dirent() reference lifetime
  libnvdimm: fix the clear-error check in nsio_rw_bytes
  libnvdimm, btt: fix btt_rw_page not returning errors
  acpi, nfit: quiet invalid block-aperture-region warnings
  libnvdimm, btt: BTT updates for UEFI 2.7 format
  acpi, nfit: constify *_attribute_group
  libnvdimm, pmem: disable dax flushing when pmem is fronting a volatile region
  libnvdimm, pmem, dax: export a cache control attribute
  dax: convert to bitmask for flags
  dax: remove default copy_from_iter fallback
  libnvdimm, nfit: enable support for volatile ranges
  libnvdimm, pmem: fix persistence warning
  ...

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/dax.c b/fs/dax.c
index cd8fced592d0..b1cd18dcc177 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -25,7 +25,6 @@
 #include <linux/mm.h>
 #include <linux/mutex.h>
 #include <linux/pagevec.h>
-#include <linux/pmem.h>
 #include <linux/sched.h>
 #include <linux/sched/signal.h>
 #include <linux/uio.h>
@@ -784,7 +783,7 @@ static int dax_writeback_one(struct block_device *bdev,
         }
 
         dax_mapping_entry_mkclean(mapping, index, pfn_t_to_pfn(pfn));
-        wb_cache_pmem(kaddr, size);
+        dax_flush(dax_dev, pgoff, kaddr, size);
         /*
          * After we have flushed the cache, we can clear the dirty tag. There
          * cannot be new dirty data in the pfn after the flush has completed as
@@ -976,7 +975,8 @@ int __dax_zero_page_range(struct block_device *bdev,
                         dax_read_unlock(id);
                         return rc;
                 }
-                clear_pmem(kaddr + offset, size);
+                memset(kaddr + offset, 0, size);
+                dax_flush(dax_dev, pgoff, kaddr + offset, size);
                 dax_read_unlock(id);
         }
         return 0;
@@ -1055,7 +1055,8 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
                         map_len = end - pos;
 
                 if (iov_iter_rw(iter) == WRITE)
-                        map_len = copy_from_iter_pmem(kaddr, map_len, iter);
+                        map_len = dax_copy_from_iter(dax_dev, pgoff, kaddr,
+                                        map_len, iter);
                 else
                         map_len = copy_to_iter(kaddr, map_len, iter);
                 if (map_len <= 0) {