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Subject[PATCH 11/13] libnvdimm, nfit: enable support for volatile ranges
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Date
Allow volatile nfit ranges to participate in all the same infrastructure
provided for persistent memory regions. A resulting resulting namespace
device will still be called "pmem", but the parent region type will be
"nd_volatile". This is in preparation for disabling the dax ->flush()
operation in the pmem driver when it is hosted on a volatile range.

Cc: Jan Kara <jack@suse.cz>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit/core.c | 9 ++++++++-
drivers/nvdimm/bus.c | 10 +++++-----
drivers/nvdimm/core.c | 2 +-
drivers/nvdimm/dax_devs.c | 2 +-
drivers/nvdimm/dimm_devs.c | 4 ++--
drivers/nvdimm/namespace_devs.c | 8 ++++----
drivers/nvdimm/nd-core.h | 9 +++++++++
drivers/nvdimm/pfn_devs.c | 4 ++--
drivers/nvdimm/region_devs.c | 27 ++++++++++++++-------------
9 files changed, 46 insertions(+), 29 deletions(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 41fa3f46e6e3..8e619881bf2d 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2144,6 +2144,13 @@ static bool nfit_spa_is_virtual(struct acpi_nfit_system_address *spa)
nfit_spa_type(spa) == NFIT_SPA_PCD);
}

+static bool nfit_spa_is_volatile(struct acpi_nfit_system_address *spa)
+{
+ return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
+ nfit_spa_type(spa) == NFIT_SPA_VCD ||
+ nfit_spa_type(spa) == NFIT_SPA_VOLATILE);
+}
+
static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
struct nfit_spa *nfit_spa)
{
@@ -2218,7 +2225,7 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
ndr_desc);
if (!nfit_spa->nd_region)
rc = -ENOMEM;
- } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
+ } else if (nfit_spa_is_volatile(spa)) {
nfit_spa->nd_region = nvdimm_volatile_region_create(nvdimm_bus,
ndr_desc);
if (!nfit_spa->nd_region)
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 23d4a1728cdf..5fea30788248 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -37,13 +37,13 @@ static int to_nd_device_type(struct device *dev)
{
if (is_nvdimm(dev))
return ND_DEVICE_DIMM;
- else if (is_nd_pmem(dev))
+ else if (is_memory(dev))
return ND_DEVICE_REGION_PMEM;
else if (is_nd_blk(dev))
return ND_DEVICE_REGION_BLK;
else if (is_nd_dax(dev))
return ND_DEVICE_DAX_PMEM;
- else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent))
+ else if (is_nd_region(dev->parent))
return nd_region_to_nstype(to_nd_region(dev->parent));

return 0;
@@ -55,7 +55,7 @@ static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
* Ensure that region devices always have their numa node set as
* early as possible.
*/
- if (is_nd_pmem(dev) || is_nd_blk(dev))
+ if (is_nd_region(dev))
set_dev_node(dev, to_nd_region(dev)->numa_node);
return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
to_nd_device_type(dev));
@@ -64,7 +64,7 @@ static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
static struct module *to_bus_provider(struct device *dev)
{
/* pin bus providers while regions are enabled */
- if (is_nd_pmem(dev) || is_nd_blk(dev)) {
+ if (is_nd_region(dev)) {
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

return nvdimm_bus->nd_desc->module;
@@ -771,7 +771,7 @@ void wait_nvdimm_bus_probe_idle(struct device *dev)

static int pmem_active(struct device *dev, void *data)
{
- if (is_nd_pmem(dev) && dev->driver)
+ if (is_memory(dev) && dev->driver)
return -EBUSY;
return 0;
}
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 9303cfeb8bee..875ef4cecb35 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -504,7 +504,7 @@ void nvdimm_badblocks_populate(struct nd_region *nd_region,
struct nvdimm_bus *nvdimm_bus;
struct list_head *poison_list;

- if (!is_nd_pmem(&nd_region->dev)) {
+ if (!is_memory(&nd_region->dev)) {
dev_WARN_ONCE(&nd_region->dev, 1,
"%s only valid for pmem regions\n", __func__);
return;
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index 45fa82cae87c..6a92b84c8072 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -89,7 +89,7 @@ struct device *nd_dax_create(struct nd_region *nd_region)
struct device *dev = NULL;
struct nd_dax *nd_dax;

- if (!is_nd_pmem(&nd_region->dev))
+ if (!is_memory(&nd_region->dev))
return NULL;

nd_dax = nd_dax_alloc(nd_region);
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 0eedc49e0d47..4455e5e002b6 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -403,7 +403,7 @@ int alias_dpa_busy(struct device *dev, void *data)
struct resource *res;
int i;

- if (!is_nd_pmem(dev))
+ if (!is_memory(dev))
return 0;

nd_region = to_nd_region(dev);
@@ -483,7 +483,7 @@ static int blk_dpa_busy(struct device *dev, void *data)
resource_size_t map_end;
int i;

- if (!is_nd_pmem(dev))
+ if (!is_memory(dev))
return 0;

nd_region = to_nd_region(dev);
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index eabfc46eb732..4778dabe200e 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -111,7 +111,7 @@ static int is_uuid_busy(struct device *dev, void *data)

static int is_namespace_uuid_busy(struct device *dev, void *data)
{
- if (is_nd_pmem(dev) || is_nd_blk(dev))
+ if (is_nd_region(dev))
return device_for_each_child(dev, data, is_uuid_busy);
return 0;
}
@@ -786,7 +786,7 @@ static int __reserve_free_pmem(struct device *dev, void *data)
struct nd_label_id label_id;
int i;

- if (!is_nd_pmem(dev))
+ if (!is_memory(dev))
return 0;

nd_region = to_nd_region(dev);
@@ -1865,7 +1865,7 @@ static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
struct resource *res;
struct device *dev;

- if (!is_nd_pmem(&nd_region->dev))
+ if (!is_memory(&nd_region->dev))
return NULL;

nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
@@ -2145,7 +2145,7 @@ static struct device **scan_labels(struct nd_region *nd_region)
}
dev->parent = &nd_region->dev;
devs[count++] = dev;
- } else if (is_nd_pmem(&nd_region->dev)) {
+ } else if (is_memory(&nd_region->dev)) {
/* clean unselected labels */
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct list_head *l, *e;
diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h
index 8623e57c2ce3..f26263cc8a36 100644
--- a/drivers/nvdimm/nd-core.h
+++ b/drivers/nvdimm/nd-core.h
@@ -63,7 +63,16 @@ struct blk_alloc_info {

bool is_nvdimm(struct device *dev);
bool is_nd_pmem(struct device *dev);
+bool is_nd_volatile(struct device *dev);
bool is_nd_blk(struct device *dev);
+static inline bool is_nd_region(struct device *dev)
+{
+ return is_nd_pmem(dev) || is_nd_blk(dev) || is_nd_volatile(dev);
+}
+static inline bool is_memory(struct device *dev)
+{
+ return is_nd_pmem(dev) || is_nd_volatile(dev);
+}
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void nvdimm_bus_exit(void);
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index a2ac9e641aa9..9a2ba98c7e11 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -331,7 +331,7 @@ struct device *nd_pfn_create(struct nd_region *nd_region)
struct nd_pfn *nd_pfn;
struct device *dev;

- if (!is_nd_pmem(&nd_region->dev))
+ if (!is_memory(&nd_region->dev))
return NULL;

nd_pfn = nd_pfn_alloc(nd_region);
@@ -354,7 +354,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
if (!pfn_sb || !ndns)
return -ENODEV;

- if (!is_nd_pmem(nd_pfn->dev.parent))
+ if (!is_memory(nd_pfn->dev.parent))
return -ENODEV;

if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb)))
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 820cdf05343b..6945df8a3367 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -168,6 +168,11 @@ bool is_nd_blk(struct device *dev)
return dev ? dev->type == &nd_blk_device_type : false;
}

+bool is_nd_volatile(struct device *dev)
+{
+ return dev ? dev->type == &nd_volatile_device_type : false;
+}
+
struct nd_region *to_nd_region(struct device *dev)
{
struct nd_region *nd_region = container_of(dev, struct nd_region, dev);
@@ -214,7 +219,7 @@ EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);
*/
int nd_region_to_nstype(struct nd_region *nd_region)
{
- if (is_nd_pmem(&nd_region->dev)) {
+ if (is_memory(&nd_region->dev)) {
u16 i, alias;

for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
@@ -242,7 +247,7 @@ static ssize_t size_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev);
unsigned long long size = 0;

- if (is_nd_pmem(dev)) {
+ if (is_memory(dev)) {
size = nd_region->ndr_size;
} else if (nd_region->ndr_mappings == 1) {
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
@@ -278,7 +283,7 @@ static ssize_t set_cookie_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev);
struct nd_interleave_set *nd_set = nd_region->nd_set;

- if (is_nd_pmem(dev) && nd_set)
+ if (is_memory(dev) && nd_set)
/* pass, should be precluded by region_visible */;
else
return -ENXIO;
@@ -305,7 +310,7 @@ resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
if (!ndd)
return 0;

- if (is_nd_pmem(&nd_region->dev)) {
+ if (is_memory(&nd_region->dev)) {
available += nd_pmem_available_dpa(nd_region,
nd_mapping, &overlap);
if (overlap > blk_max_overlap) {
@@ -469,10 +474,10 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
struct nd_interleave_set *nd_set = nd_region->nd_set;
int type = nd_region_to_nstype(nd_region);

- if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr)
+ if (!is_memory(dev) && a == &dev_attr_pfn_seed.attr)
return 0;

- if (!is_nd_pmem(dev) && a == &dev_attr_dax_seed.attr)
+ if (!is_memory(dev) && a == &dev_attr_dax_seed.attr)
return 0;

if (a != &dev_attr_set_cookie.attr
@@ -483,7 +488,7 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
|| type == ND_DEVICE_NAMESPACE_BLK)
&& a == &dev_attr_available_size.attr)
return a->mode;
- else if (is_nd_pmem(dev) && nd_set)
+ else if (is_memory(dev) && nd_set)
return a->mode;

return 0;
@@ -526,7 +531,7 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
{
struct nd_region *nd_region;

- if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) {
+ if (!probe && is_nd_region(dev)) {
int i;

nd_region = to_nd_region(dev);
@@ -544,12 +549,8 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
if (ndd)
atomic_dec(&nvdimm->busy);
}
-
- if (is_nd_pmem(dev))
- return;
}
- if (dev->parent && (is_nd_blk(dev->parent) || is_nd_pmem(dev->parent))
- && probe) {
+ if (dev->parent && is_nd_region(dev->parent) && probe) {
nd_region = to_nd_region(dev->parent);
nvdimm_bus_lock(dev);
if (nd_region->ns_seed == dev)
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