Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm fixes from Dan Williams:

 - Fix for the nd_blk (NVDIMM Block Window Aperture) driver.

   A spec clarification requires the driver to mask off reserved bits in
   status register.  This is tagged for -stable back to the v4.2 kernel.

 - Fix for a kernel crash in the nvdimm unit tests when module loading
   is interrupted with SIGTERM.  Tagged for -stable since validation
   efforts external to Intel use the unit tests for qualifying
   backports.

 - Add a new 'size' sysfs attribute for the BTT (NVDIMM Block
   Translation Table) driver to make it symmetric with the other
   namespace personality drivers (PFN and DAX) that provide a size
   attribute for indicating how much namespace capacity is lost to
   metadata.

   The BTT change arrived at the start of the merge window and has
   appeared in a -next release.  It can technically wait for 4.9, but it
   is small, fixes asymmetry in the libnvdimm-sysfs interface, and
   something I would have squeezed into the v4.8 pull request had it
   arrived a few days earlier.

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  tools/testing/nvdimm: fix SIGTERM vs hotplug crash
  nvdimm, btt: add a size attribute for BTTs
  libnvdimm, nd_blk: mask off reserved status bits

5 files changed, 26 insertions, 1 deletions

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 8c234dd9b8bc..80cc7c089a15 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1527,11 +1527,12 @@ static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
 {
         struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
         u64 offset = nfit_blk->stat_offset + mmio->size * bw;
+        const u32 STATUS_MASK = 0x80000037;
 
         if (mmio->num_lines)
                 offset = to_interleave_offset(offset, mmio);
 
-        return readl(mmio->addr.base + offset);
+        return readl(mmio->addr.base + offset) & STATUS_MASK;
 }
 
 static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 88e91666f145..368795aad5c9 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1269,6 +1269,7 @@ static int btt_blk_init(struct btt *btt)
                 }
         }
         set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9);
+        btt->nd_btt->size = btt->nlba * (u64)btt->sector_size;
         revalidate_disk(btt->btt_disk);
 
         return 0;
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index 3fa7919f94a8..97dd2925ed6e 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -140,10 +140,30 @@ static ssize_t namespace_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(namespace);
 
+static ssize_t size_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct nd_btt *nd_btt = to_nd_btt(dev);
+        ssize_t rc;
+
+        device_lock(dev);
+        if (dev->driver)
+                rc = sprintf(buf, "%llu\n", nd_btt->size);
+        else {
+                /* no size to convey if the btt instance is disabled */
+                rc = -ENXIO;
+        }
+        device_unlock(dev);
+
+        return rc;
+}
+static DEVICE_ATTR_RO(size);
+
 static struct attribute *nd_btt_attributes[] = {
         &dev_attr_sector_size.attr,
         &dev_attr_namespace.attr,
         &dev_attr_uuid.attr,
+        &dev_attr_size.attr,
         NULL,
 };
 
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 40476399d227..8024a0ef86d3 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -143,6 +143,7 @@ struct nd_btt {
         struct nd_namespace_common *ndns;
         struct btt *btt;
         unsigned long lbasize;
+        u64 size;
         u8 *uuid;
         int id;
 };
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index 5404efa578a3..dd48f421844c 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -13,6 +13,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
+#include <linux/workqueue.h>
 #include <linux/libnvdimm.h>
 #include <linux/vmalloc.h>
 #include <linux/device.h>
@@ -1474,6 +1475,7 @@ static int nfit_test_probe(struct platform_device *pdev)
         if (nfit_test->setup != nfit_test0_setup)
                 return 0;
 
+        flush_work(&acpi_desc->work);
         nfit_test->setup_hotplug = 1;
         nfit_test->setup(nfit_test);