Merge tag 'libnvdimm-for-4.19_misc' of gitolite.kernel.org:pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm updates from Dave Jiang:
 "Collection of misc libnvdimm patches for 4.19 submission:

   - Adding support to read locked nvdimm capacity.

   - Change test code to make DSM failure code injection an override.

   - Add support for calculate maximum contiguous area for namespace.

   - Add support for queueing a short ARS when there is on going ARS for
     nvdimm.

   - Allow NULL to be passed in to ->direct_access() for kaddr and pfn
     params.

   - Improve smart injection support for nvdimm emulation testing.

   - Fix test code that supports for emulating controller temperature.

   - Fix hang on error before devm_memremap_pages()

   - Fix a bug that causes user memory corruption when data returned to
     user for ars_status.

   - Maintainer updates for Ross Zwisler emails and adding Jan Kara to
     fsdax"

* tag 'libnvdimm-for-4.19_misc' of gitolite.kernel.org:pub/scm/linux/kernel/git/nvdimm/nvdimm:
  libnvdimm: fix ars_status output length calculation
  device-dax: avoid hang on error before devm_memremap_pages()
  tools/testing/nvdimm: improve emulation of smart injection
  filesystem-dax: Do not request kaddr and pfn when not required
  md/dm-writecache: Don't request pointer dummy_addr when not required
  dax/super: Do not request a pointer kaddr when not required
  tools/testing/nvdimm: kaddr and pfn can be NULL to ->direct_access()
  s390, dcssblk: kaddr and pfn can be NULL to ->direct_access()
  libnvdimm, pmem: kaddr and pfn can be NULL to ->direct_access()
  acpi/nfit: queue issuing of ars when an uc error notification comes in
  libnvdimm: Export max available extent
  libnvdimm: Use max contiguous area for namespace size
  MAINTAINERS: Add Jan Kara for filesystem DAX
  MAINTAINERS: update Ross Zwisler's email address
  tools/testing/nvdimm: Fix support for emulating controller temperature
  tools/testing/nvdimm: Make DSM failure code injection an override
  acpi, nfit: Prefer _DSM over _LSR for namespace label reads
  libnvdimm: Introduce locked DIMM capacity support

19 files changed, 270 insertions, 90 deletions

diff --git a/.mailmap b/.mailmap
index 2a6f685bf706..285e09645b31 100644
--- a/.mailmap
+++ b/.mailmap
@@ -159,6 +159,7 @@ Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
 Randy Dunlap <rdunlap@infradead.org> <rdunlap@xenotime.net>
 Rémi Denis-Courmont <rdenis@simphalempin.com>
 Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
+Ross Zwisler <zwisler@kernel.org> <ross.zwisler@linux.intel.com>
 Rudolf Marek <R.Marek@sh.cvut.cz>
 Rui Saraiva <rmps@joel.ist.utl.pt>
 Sachin P Sant <ssant@in.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index e20e7c42347b..a5b256b25905 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4364,7 +4364,8 @@ F:	drivers/i2c/busses/i2c-diolan-u2c.c
 
 FILESYSTEM DIRECT ACCESS (DAX)
 M:      Matthew Wilcox <mawilcox@microsoft.com>
-M:      Ross Zwisler <ross.zwisler@linux.intel.com>
+M:      Ross Zwisler <zwisler@kernel.org>
+M:      Jan Kara <jack@suse.cz>
 L:      linux-fsdevel@vger.kernel.org
 S:      Supported
 F:      fs/dax.c
@@ -4374,7 +4375,7 @@ F:	include/trace/events/fs_dax.h
 DEVICE DIRECT ACCESS (DAX)
 M:      Dan Williams <dan.j.williams@intel.com>
 M:      Dave Jiang <dave.jiang@intel.com>
-M:      Ross Zwisler <ross.zwisler@linux.intel.com>
+M:      Ross Zwisler <zwisler@kernel.org>
 M:      Vishal Verma <vishal.l.verma@intel.com>
 L:      linux-nvdimm@lists.01.org
 S:      Supported
@@ -8303,7 +8304,7 @@ S:	Maintained
 F:      tools/lib/lockdep/
 
 LIBNVDIMM BLK: MMIO-APERTURE DRIVER
-M:      Ross Zwisler <ross.zwisler@linux.intel.com>
+M:      Ross Zwisler <zwisler@kernel.org>
 M:      Dan Williams <dan.j.williams@intel.com>
 M:      Vishal Verma <vishal.l.verma@intel.com>
 M:      Dave Jiang <dave.jiang@intel.com>
@@ -8316,7 +8317,7 @@ F:	drivers/nvdimm/region_devs.c
 LIBNVDIMM BTT: BLOCK TRANSLATION TABLE
 M:      Vishal Verma <vishal.l.verma@intel.com>
 M:      Dan Williams <dan.j.williams@intel.com>
-M:      Ross Zwisler <ross.zwisler@linux.intel.com>
+M:      Ross Zwisler <zwisler@kernel.org>
 M:      Dave Jiang <dave.jiang@intel.com>
 L:      linux-nvdimm@lists.01.org
 Q:      https://patchwork.kernel.org/project/linux-nvdimm/list/
@@ -8324,7 +8325,7 @@ S:	Supported
 F:      drivers/nvdimm/btt*
 
 LIBNVDIMM PMEM: PERSISTENT MEMORY DRIVER
-M:      Ross Zwisler <ross.zwisler@linux.intel.com>
+M:      Ross Zwisler <zwisler@kernel.org>
 M:      Dan Williams <dan.j.williams@intel.com>
 M:      Vishal Verma <vishal.l.verma@intel.com>
 M:      Dave Jiang <dave.jiang@intel.com>
@@ -8343,7 +8344,7 @@ F:	Documentation/devicetree/bindings/pmem/pmem-region.txt
 
 LIBNVDIMM: NON-VOLATILE MEMORY DEVICE SUBSYSTEM
 M:      Dan Williams <dan.j.williams@intel.com>
-M:      Ross Zwisler <ross.zwisler@linux.intel.com>
+M:      Ross Zwisler <zwisler@kernel.org>
 M:      Vishal Verma <vishal.l.verma@intel.com>
 M:      Dave Jiang <dave.jiang@intel.com>
 L:      linux-nvdimm@lists.01.org
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 7c479002e798..b072cfc5f20e 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1699,7 +1699,7 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
 {
         struct acpi_device *adev, *adev_dimm;
         struct device *dev = acpi_desc->dev;
-        unsigned long dsm_mask;
+        unsigned long dsm_mask, label_mask;
         const guid_t *guid;
         int i;
         int family = -1;
@@ -1771,6 +1771,16 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
                                         1ULL << i))
                         set_bit(i, &nfit_mem->dsm_mask);
 
+        /*
+         * Prefer the NVDIMM_FAMILY_INTEL label read commands if present
+         * due to their better semantics handling locked capacity.
+         */
+        label_mask = 1 << ND_CMD_GET_CONFIG_SIZE | 1 << ND_CMD_GET_CONFIG_DATA
+                | 1 << ND_CMD_SET_CONFIG_DATA;
+        if (family == NVDIMM_FAMILY_INTEL
+                        && (dsm_mask & label_mask) == label_mask)
+                return 0;
+
         if (acpi_nvdimm_has_method(adev_dimm, "_LSI")
                         && acpi_nvdimm_has_method(adev_dimm, "_LSR")) {
                 dev_dbg(dev, "%s: has _LSR\n", dev_name(&adev_dimm->dev));
@@ -2559,7 +2569,12 @@ static void ars_complete(struct acpi_nfit_desc *acpi_desc,
                         test_bit(ARS_SHORT, &nfit_spa->ars_state)
                         ? "short" : "long");
         clear_bit(ARS_SHORT, &nfit_spa->ars_state);
-        set_bit(ARS_DONE, &nfit_spa->ars_state);
+        if (test_and_clear_bit(ARS_REQ_REDO, &nfit_spa->ars_state)) {
+                set_bit(ARS_SHORT, &nfit_spa->ars_state);
+                set_bit(ARS_REQ, &nfit_spa->ars_state);
+                dev_dbg(dev, "ARS: processing scrub request received while in progress\n");
+        } else
+                set_bit(ARS_DONE, &nfit_spa->ars_state);
 }
 
 static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc)
@@ -3256,9 +3271,10 @@ int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc, unsigned long flags)
                 if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
                         continue;
 
-                if (test_and_set_bit(ARS_REQ, &nfit_spa->ars_state))
+                if (test_and_set_bit(ARS_REQ, &nfit_spa->ars_state)) {
                         busy++;
-                else {
+                        set_bit(ARS_REQ_REDO, &nfit_spa->ars_state);
+                } else {
                         if (test_bit(ARS_SHORT, &flags))
                                 set_bit(ARS_SHORT, &nfit_spa->ars_state);
                         scheduled++;
diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h
index a97ff42fe311..d1274ea2d251 100644
--- a/drivers/acpi/nfit/nfit.h
+++ b/drivers/acpi/nfit/nfit.h
@@ -119,6 +119,7 @@ enum nfit_dimm_notifiers {
 
 enum nfit_ars_state {
         ARS_REQ,
+        ARS_REQ_REDO,
         ARS_DONE,
         ARS_SHORT,
         ARS_FAILED,
diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c
index fd49b24fd6af..99e2aace8078 100644
--- a/drivers/dax/pmem.c
+++ b/drivers/dax/pmem.c
@@ -105,15 +105,19 @@ static int dax_pmem_probe(struct device *dev)
         if (rc)
                 return rc;
 
-        rc = devm_add_action_or_reset(dev, dax_pmem_percpu_exit,
-                                                        &dax_pmem->ref);
-        if (rc)
+        rc = devm_add_action(dev, dax_pmem_percpu_exit, &dax_pmem->ref);
+        if (rc) {
+                percpu_ref_exit(&dax_pmem->ref);
                 return rc;
+        }
 
         dax_pmem->pgmap.ref = &dax_pmem->ref;
         addr = devm_memremap_pages(dev, &dax_pmem->pgmap);
-        if (IS_ERR(addr))
+        if (IS_ERR(addr)) {
+                devm_remove_action(dev, dax_pmem_percpu_exit, &dax_pmem->ref);
+                percpu_ref_exit(&dax_pmem->ref);
                 return PTR_ERR(addr);
+        }
 
         rc = devm_add_action_or_reset(dev, dax_pmem_percpu_kill,
                                                         &dax_pmem->ref);
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 45276abf03aa..6e928f37d084 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -89,7 +89,6 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
         struct request_queue *q;
         pgoff_t pgoff;
         int err, id;
-        void *kaddr;
         pfn_t pfn;
         long len;
         char buf[BDEVNAME_SIZE];
@@ -122,7 +121,7 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
         }
 
         id = dax_read_lock();
-        len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);
+        len = dax_direct_access(dax_dev, pgoff, 1, NULL, &pfn);
         dax_read_unlock(id);
 
         put_dax(dax_dev);
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index 3a28a68f184c..5f1f80d424dd 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -268,9 +268,8 @@ static int persistent_memory_claim(struct dm_writecache *wc)
                 i = 0;
                 do {
                         long daa;
-                        void *dummy_addr;
                         daa = dax_direct_access(wc->ssd_dev->dax_dev, i, p - i,
-                                                &dummy_addr, &pfn);
+                                                NULL, &pfn);
                         if (daa <= 0) {
                                 r = daa ? daa : -EINVAL;
                                 goto err3;
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 27902a8799b1..8aae6dcc839f 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -812,9 +812,9 @@ u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
                  * overshoots the remainder by 4 bytes, assume it was
                  * including 'status'.
                  */
-                if (out_field[1] - 8 == remainder)
+                if (out_field[1] - 4 == remainder)
                         return remainder;
-                return out_field[1] - 4;
+                return out_field[1] - 8;
         } else if (cmd == ND_CMD_CALL) {
                 struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field;
 
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
index 233907889f96..6c8fb7590838 100644
--- a/drivers/nvdimm/dimm.c
+++ b/drivers/nvdimm/dimm.c
@@ -34,6 +34,9 @@ static int nvdimm_probe(struct device *dev)
                 return rc;
         }
 
+        /* reset locked, to be validated below... */
+        nvdimm_clear_locked(dev);
+
         ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
         if (!ndd)
                 return -ENOMEM;
@@ -48,12 +51,30 @@ static int nvdimm_probe(struct device *dev)
         get_device(dev);
         kref_init(&ndd->kref);
 
+        /*
+         * EACCES failures reading the namespace label-area-properties
+         * are interpreted as the DIMM capacity being locked but the
+         * namespace labels themselves being accessible.
+         */
         rc = nvdimm_init_nsarea(ndd);
-        if (rc == -EACCES)
+        if (rc == -EACCES) {
+                /*
+                 * See nvdimm_namespace_common_probe() where we fail to
+                 * allow namespaces to probe while the DIMM is locked,
+                 * but we do allow for namespace enumeration.
+                 */
                 nvdimm_set_locked(dev);
+                rc = 0;
+        }
         if (rc)
                 goto err;
 
+        /*
+         * EACCES failures reading the namespace label-data are
+         * interpreted as the label area being locked in addition to the
+         * DIMM capacity. We fail the dimm probe to prevent regions from
+         * attempting to parse the label area.
+         */
         rc = nvdimm_init_config_data(ndd);
         if (rc == -EACCES)
                 nvdimm_set_locked(dev);
@@ -72,7 +93,6 @@ static int nvdimm_probe(struct device *dev)
                 if (rc == 0)
                         nvdimm_set_aliasing(dev);
         }
-        nvdimm_clear_locked(dev);
         nvdimm_bus_unlock(dev);
 
         if (rc)
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 8d348b22ba45..863cabc35215 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -537,6 +537,37 @@ resource_size_t nd_blk_available_dpa(struct nd_region *nd_region)
 }
 
 /**
+ * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
+ *                         contiguous unallocated dpa range.
+ * @nd_region: constrain available space check to this reference region
+ * @nd_mapping: container of dpa-resource-root + labels
+ */
+resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
+                                           struct nd_mapping *nd_mapping)
+{
+        struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+        struct nvdimm_bus *nvdimm_bus;
+        resource_size_t max = 0;
+        struct resource *res;
+
+        /* if a dimm is disabled the available capacity is zero */
+        if (!ndd)
+                return 0;
+
+        nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+        if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
+                return 0;
+        for_each_dpa_resource(ndd, res) {
+                if (strcmp(res->name, "pmem-reserve") != 0)
+                        continue;
+                if (resource_size(res) > max)
+                        max = resource_size(res);
+        }
+        release_free_pmem(nvdimm_bus, nd_mapping);
+        return max;
+}
+
+/**
  * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
  * @nd_mapping: container of dpa-resource-root + labels
  * @nd_region: constrain available space check to this reference region
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 28afdd668905..4a4266250c28 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -799,7 +799,7 @@ static int merge_dpa(struct nd_region *nd_region,
         return 0;
 }
 
-static int __reserve_free_pmem(struct device *dev, void *data)
+int __reserve_free_pmem(struct device *dev, void *data)
 {
         struct nvdimm *nvdimm = data;
         struct nd_region *nd_region;
@@ -836,7 +836,7 @@ static int __reserve_free_pmem(struct device *dev, void *data)
         return 0;
 }
 
-static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
+void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
                 struct nd_mapping *nd_mapping)
 {
         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
@@ -1032,7 +1032,7 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
 
                 allocated += nvdimm_allocated_dpa(ndd, &label_id);
         }
-        available = nd_region_available_dpa(nd_region);
+        available = nd_region_allocatable_dpa(nd_region);
 
         if (val > available + allocated)
                 return -ENOSPC;
@@ -1144,6 +1144,26 @@ resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
 }
 EXPORT_SYMBOL(nvdimm_namespace_capacity);
 
+bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
+{
+        int i;
+        bool locked = false;
+        struct device *dev = &ndns->dev;
+        struct nd_region *nd_region = to_nd_region(dev->parent);
+
+        for (i = 0; i < nd_region->ndr_mappings; i++) {
+                struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+                struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+                if (test_bit(NDD_LOCKED, &nvdimm->flags)) {
+                        dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm));
+                        locked = true;
+                }
+        }
+        return locked;
+}
+EXPORT_SYMBOL(nvdimm_namespace_locked);
+
 static ssize_t size_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
@@ -1695,6 +1715,9 @@ struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
                 }
         }
 
+        if (nvdimm_namespace_locked(ndns))
+                return ERR_PTR(-EACCES);
+
         size = nvdimm_namespace_capacity(ndns);
         if (size < ND_MIN_NAMESPACE_SIZE) {
                 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h
index 79274ead54fb..ac68072fb8cd 100644
--- a/drivers/nvdimm/nd-core.h
+++ b/drivers/nvdimm/nd-core.h
@@ -100,6 +100,14 @@ struct nd_region;
 struct nvdimm_drvdata;
 struct nd_mapping;
 void nd_mapping_free_labels(struct nd_mapping *nd_mapping);
+
+int __reserve_free_pmem(struct device *dev, void *data);
+void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
+                       struct nd_mapping *nd_mapping);
+
+resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
+                                           struct nd_mapping *nd_mapping);
+resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region);
 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
                 struct nd_mapping *nd_mapping, resource_size_t *overlap);
 resource_size_t nd_blk_available_dpa(struct nd_region *nd_region);
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 6ee7fd7e4bbd..98317e7ce5b5 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -357,6 +357,7 @@ struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
                 struct nd_label_id *label_id, resource_size_t start,
                 resource_size_t n);
 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
+bool nvdimm_namespace_locked(struct nd_namespace_common *ndns);
 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
 int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index dd17acd8fe68..c23649867696 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -226,8 +226,11 @@ __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
         if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
                                         PFN_PHYS(nr_pages))))
                 return -EIO;
-        *kaddr = pmem->virt_addr + offset;
-        *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
+
+        if (kaddr)
+                *kaddr = pmem->virt_addr + offset;
+        if (pfn)
+                *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
 
         /*
          * If badblocks are present, limit known good range to the
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index ec3543b83330..fa37afcd43ff 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -389,6 +389,30 @@ resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
         return available;
 }
 
+resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region)
+{
+        resource_size_t available = 0;
+        int i;
+
+        if (is_memory(&nd_region->dev))
+                available = PHYS_ADDR_MAX;
+
+        WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
+        for (i = 0; i < nd_region->ndr_mappings; i++) {
+                struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+
+                if (is_memory(&nd_region->dev))
+                        available = min(available,
+                                        nd_pmem_max_contiguous_dpa(nd_region,
+                                                                   nd_mapping));
+                else if (is_nd_blk(&nd_region->dev))
+                        available += nd_blk_available_dpa(nd_region);
+        }
+        if (is_memory(&nd_region->dev))
+                return available * nd_region->ndr_mappings;
+        return available;
+}
+
 static ssize_t available_size_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
@@ -410,6 +434,21 @@ static ssize_t available_size_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(available_size);
 
+static ssize_t max_available_extent_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct nd_region *nd_region = to_nd_region(dev);
+        unsigned long long available = 0;
+
+        nvdimm_bus_lock(dev);
+        wait_nvdimm_bus_probe_idle(dev);
+        available = nd_region_allocatable_dpa(nd_region);
+        nvdimm_bus_unlock(dev);
+
+        return sprintf(buf, "%llu\n", available);
+}
+static DEVICE_ATTR_RO(max_available_extent);
+
 static ssize_t init_namespaces_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
@@ -561,6 +600,7 @@ static struct attribute *nd_region_attributes[] = {
         &dev_attr_read_only.attr,
         &dev_attr_set_cookie.attr,
         &dev_attr_available_size.attr,
+        &dev_attr_max_available_extent.attr,
         &dev_attr_namespace_seed.attr,
         &dev_attr_init_namespaces.attr,
         &dev_attr_badblocks.attr,
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index ed607288e696..23e526cda5c1 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -922,9 +922,11 @@ __dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff,
         unsigned long dev_sz;
 
         dev_sz = dev_info->end - dev_info->start + 1;
-        *kaddr = (void *) dev_info->start + offset;
-        *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset),
-                        PFN_DEV|PFN_SPECIAL);
+        if (kaddr)
+                *kaddr = (void *) dev_info->start + offset;
+        if (pfn)
+                *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset),
+                                PFN_DEV|PFN_SPECIAL);
 
         return (dev_sz - offset) / PAGE_SIZE;
 }
diff --git a/fs/dax.c b/fs/dax.c
index 897b51e41d8f..f76724139f80 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -655,7 +655,6 @@ static int copy_user_dax(struct block_device *bdev, struct dax_device *dax_dev,
 {
         void *vto, *kaddr;
         pgoff_t pgoff;
-        pfn_t pfn;
         long rc;
         int id;
 
@@ -664,7 +663,7 @@ static int copy_user_dax(struct block_device *bdev, struct dax_device *dax_dev,
                 return rc;
 
         id = dax_read_lock();
-        rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
+        rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, NULL);
         if (rc < 0) {
                 dax_read_unlock(id);
                 return rc;
@@ -975,7 +974,6 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
 {
         const sector_t sector = dax_iomap_sector(iomap, pos);
         pgoff_t pgoff;
-        void *kaddr;
         int id, rc;
         long length;
 
@@ -984,7 +982,7 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
                 return rc;
         id = dax_read_lock();
         length = dax_direct_access(iomap->dax_dev, pgoff, PHYS_PFN(size),
-                                   &kaddr, pfnp);
+                                   NULL, pfnp);
         if (length < 0) {
                 rc = length;
                 goto out;
@@ -1060,15 +1058,13 @@ int __dax_zero_page_range(struct block_device *bdev,
                 pgoff_t pgoff;
                 long rc, id;
                 void *kaddr;
-                pfn_t pfn;
 
                 rc = bdev_dax_pgoff(bdev, sector, PAGE_SIZE, &pgoff);
                 if (rc)
                         return rc;
 
                 id = dax_read_lock();
-                rc = dax_direct_access(dax_dev, pgoff, 1, &kaddr,
-                                &pfn);
+                rc = dax_direct_access(dax_dev, pgoff, 1, &kaddr, NULL);
                 if (rc < 0) {
                         dax_read_unlock(id);
                         return rc;
@@ -1124,7 +1120,6 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
                 ssize_t map_len;
                 pgoff_t pgoff;
                 void *kaddr;
-                pfn_t pfn;
 
                 if (fatal_signal_pending(current)) {
                         ret = -EINTR;
@@ -1136,7 +1131,7 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
                         break;
 
                 map_len = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size),
-                                &kaddr, &pfn);
+                                &kaddr, NULL);
                 if (map_len < 0) {
                         ret = map_len;
                         break;
diff --git a/tools/testing/nvdimm/pmem-dax.c b/tools/testing/nvdimm/pmem-dax.c
index b53596ad601b..2e7fd8227969 100644
--- a/tools/testing/nvdimm/pmem-dax.c
+++ b/tools/testing/nvdimm/pmem-dax.c
@@ -31,17 +31,21 @@ long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
         if (get_nfit_res(pmem->phys_addr + offset)) {
                 struct page *page;
 
-                *kaddr = pmem->virt_addr + offset;
+                if (kaddr)
+                        *kaddr = pmem->virt_addr + offset;
                 page = vmalloc_to_page(pmem->virt_addr + offset);
-                *pfn = page_to_pfn_t(page);
+                if (pfn)
+                        *pfn = page_to_pfn_t(page);
                 pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n",
                                 __func__, pmem, pgoff, page_to_pfn(page));
 
                 return 1;
         }
 
-        *kaddr = pmem->virt_addr + offset;
-        *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
+        if (kaddr)
+                *kaddr = pmem->virt_addr + offset;
+        if (pfn)
+                *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
 
         /*
          * If badblocks are present, limit known good range to the
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index e2926f72a821..cffc2c5a778d 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -142,6 +142,28 @@ static u32 handle[] = {
 static unsigned long dimm_fail_cmd_flags[NUM_DCR];
 static int dimm_fail_cmd_code[NUM_DCR];
 
+static const struct nd_intel_smart smart_def = {
+        .flags = ND_INTEL_SMART_HEALTH_VALID
+                | ND_INTEL_SMART_SPARES_VALID
+                | ND_INTEL_SMART_ALARM_VALID
+                | ND_INTEL_SMART_USED_VALID
+                | ND_INTEL_SMART_SHUTDOWN_VALID
+                | ND_INTEL_SMART_MTEMP_VALID
+                | ND_INTEL_SMART_CTEMP_VALID,
+        .health = ND_INTEL_SMART_NON_CRITICAL_HEALTH,
+        .media_temperature = 23 * 16,
+        .ctrl_temperature = 25 * 16,
+        .pmic_temperature = 40 * 16,
+        .spares = 75,
+        .alarm_flags = ND_INTEL_SMART_SPARE_TRIP
+                | ND_INTEL_SMART_TEMP_TRIP,
+        .ait_status = 1,
+        .life_used = 5,
+        .shutdown_state = 0,
+        .vendor_size = 0,
+        .shutdown_count = 100,
+};
+
 struct nfit_test_fw {
         enum intel_fw_update_state state;
         u32 context;
@@ -752,15 +774,30 @@ static int nfit_test_cmd_smart_inject(
         if (buf_len != sizeof(*inj))
                 return -EINVAL;
 
-        if (inj->mtemp_enable)
-                smart->media_temperature = inj->media_temperature;
-        if (inj->spare_enable)
-                smart->spares = inj->spares;
-        if (inj->fatal_enable)
-                smart->health = ND_INTEL_SMART_FATAL_HEALTH;
-        if (inj->unsafe_shutdown_enable) {
-                smart->shutdown_state = 1;
-                smart->shutdown_count++;
+        if (inj->flags & ND_INTEL_SMART_INJECT_MTEMP) {
+                if (inj->mtemp_enable)
+                        smart->media_temperature = inj->media_temperature;
+                else
+                        smart->media_temperature = smart_def.media_temperature;
+        }
+        if (inj->flags & ND_INTEL_SMART_INJECT_SPARE) {
+                if (inj->spare_enable)
+                        smart->spares = inj->spares;
+                else
+                        smart->spares = smart_def.spares;
+        }
+        if (inj->flags & ND_INTEL_SMART_INJECT_FATAL) {
+                if (inj->fatal_enable)
+                        smart->health = ND_INTEL_SMART_FATAL_HEALTH;
+                else
+                        smart->health = ND_INTEL_SMART_NON_CRITICAL_HEALTH;
+        }
+        if (inj->flags & ND_INTEL_SMART_INJECT_SHUTDOWN) {
+                if (inj->unsafe_shutdown_enable) {
+                        smart->shutdown_state = 1;
+                        smart->shutdown_count++;
+                } else
+                        smart->shutdown_state = 0;
         }
         inj->status = 0;
         smart_notify(bus_dev, dimm_dev, smart, thresh);
@@ -884,6 +921,16 @@ static int nd_intel_test_cmd_set_lss_status(struct nfit_test *t,
         return 0;
 }
 
+static int override_return_code(int dimm, unsigned int func, int rc)
+{
+        if ((1 << func) & dimm_fail_cmd_flags[dimm]) {
+                if (dimm_fail_cmd_code[dimm])
+                        return dimm_fail_cmd_code[dimm];
+                return -EIO;
+        }
+        return rc;
+}
+
 static int get_dimm(struct nfit_mem *nfit_mem, unsigned int func)
 {
         int i;
@@ -894,13 +941,6 @@ static int get_dimm(struct nfit_mem *nfit_mem, unsigned int func)
                         break;
         if (i >= ARRAY_SIZE(handle))
                 return -ENXIO;
-
-        if ((1 << func) & dimm_fail_cmd_flags[i]) {
-                if (dimm_fail_cmd_code[i])
-                        return dimm_fail_cmd_code[i];
-                return -EIO;
-        }
-
         return i;
 }
 
@@ -939,48 +979,59 @@ static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc,
 
                         switch (func) {
                         case ND_INTEL_ENABLE_LSS_STATUS:
-                                return nd_intel_test_cmd_set_lss_status(t,
+                                rc = nd_intel_test_cmd_set_lss_status(t,
                                                 buf, buf_len);
+                                break;
                         case ND_INTEL_FW_GET_INFO:
-                                return nd_intel_test_get_fw_info(t, buf,
+                                rc = nd_intel_test_get_fw_info(t, buf,
                                                 buf_len, i - t->dcr_idx);
+                                break;
                         case ND_INTEL_FW_START_UPDATE:
-                                return nd_intel_test_start_update(t, buf,
+                                rc = nd_intel_test_start_update(t, buf,
                                                 buf_len, i - t->dcr_idx);
+                                break;
                         case ND_INTEL_FW_SEND_DATA:
-                                return nd_intel_test_send_data(t, buf,
+                                rc = nd_intel_test_send_data(t, buf,
                                                 buf_len, i - t->dcr_idx);
+                                break;
                         case ND_INTEL_FW_FINISH_UPDATE:
-                                return nd_intel_test_finish_fw(t, buf,
+                                rc = nd_intel_test_finish_fw(t, buf,
                                                 buf_len, i - t->dcr_idx);
+                                break;
                         case ND_INTEL_FW_FINISH_QUERY:
-                                return nd_intel_test_finish_query(t, buf,
+                                rc = nd_intel_test_finish_query(t, buf,
                                                 buf_len, i - t->dcr_idx);
+                                break;
                         case ND_INTEL_SMART:
-                                return nfit_test_cmd_smart(buf, buf_len,
+                                rc = nfit_test_cmd_smart(buf, buf_len,
                                                 &t->smart[i - t->dcr_idx]);
+                                break;
                         case ND_INTEL_SMART_THRESHOLD:
-                                return nfit_test_cmd_smart_threshold(buf,
+                                rc = nfit_test_cmd_smart_threshold(buf,
                                                 buf_len,
                                                 &t->smart_threshold[i -
                                                         t->dcr_idx]);
+                                break;
                         case ND_INTEL_SMART_SET_THRESHOLD:
-                                return nfit_test_cmd_smart_set_threshold(buf,
+                                rc = nfit_test_cmd_smart_set_threshold(buf,
                                                 buf_len,
                                                 &t->smart_threshold[i -
                                                         t->dcr_idx],
                                                 &t->smart[i - t->dcr_idx],
                                                 &t->pdev.dev, t->dimm_dev[i]);
+                                break;
                         case ND_INTEL_SMART_INJECT:
-                                return nfit_test_cmd_smart_inject(buf,
+                                rc = nfit_test_cmd_smart_inject(buf,
                                                 buf_len,
                                                 &t->smart_threshold[i -
                                                         t->dcr_idx],
                                                 &t->smart[i - t->dcr_idx],
                                                 &t->pdev.dev, t->dimm_dev[i]);
+                                break;
                         default:
                                 return -ENOTTY;
                         }
+                        return override_return_code(i, func, rc);
                 }
 
                 if (!test_bit(cmd, &cmd_mask)
@@ -1006,6 +1057,7 @@ static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc,
                 default:
                         return -ENOTTY;
                 }
+                return override_return_code(i, func, rc);
         } else {
                 struct ars_state *ars_state = &t->ars_state;
                 struct nd_cmd_pkg *call_pkg = buf;
@@ -1302,29 +1354,9 @@ static void smart_init(struct nfit_test *t)
                 .ctrl_temperature = 30 * 16,
                 .spares = 5,
         };
-        const struct nd_intel_smart smart_data = {
-                .flags = ND_INTEL_SMART_HEALTH_VALID
-                        | ND_INTEL_SMART_SPARES_VALID
-                        | ND_INTEL_SMART_ALARM_VALID
-                        | ND_INTEL_SMART_USED_VALID
-                        | ND_INTEL_SMART_SHUTDOWN_VALID
-                        | ND_INTEL_SMART_MTEMP_VALID,
-                .health = ND_INTEL_SMART_NON_CRITICAL_HEALTH,
-                .media_temperature = 23 * 16,
-                .ctrl_temperature = 25 * 16,
-                .pmic_temperature = 40 * 16,
-                .spares = 75,
-                .alarm_flags = ND_INTEL_SMART_SPARE_TRIP
-                        | ND_INTEL_SMART_TEMP_TRIP,
-                .ait_status = 1,
-                .life_used = 5,
-                .shutdown_state = 0,
-                .vendor_size = 0,
-                .shutdown_count = 100,
-        };
 
         for (i = 0; i < t->num_dcr; i++) {
-                memcpy(&t->smart[i], &smart_data, sizeof(smart_data));
+                memcpy(&t->smart[i], &smart_def, sizeof(smart_def));
                 memcpy(&t->smart_threshold[i], &smart_t_data,
                                 sizeof(smart_t_data));
         }