diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2019-10-31 13:57:41 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-11-15 06:08:47 +0300 |
| commit | 8f4b01fcded2dc821349cc0edfa5311c05abe293 (patch) | |
| tree | e5ffcdc65bcd6d76c7c0f1b3ba23dc302887c97c /drivers/nvdimm/nd-core.h | |
| parent | c1f45d86a522d568aef541dbbc066ccac262b4c3 (diff) | |
| download | linux-8f4b01fcded2dc821349cc0edfa5311c05abe293.tar.xz | |
libnvdimm/namespace: Differentiate between probe mapping and runtime mapping
The nvdimm core currently maps the full namespace to an ioremap range
while probing the namespace mode. This can result in probe failures on
architectures that have limited ioremap space.
For example, with a large btt namespace that consumes most of I/O remap
range, depending on the sequence of namespace initialization, the user
can find a pfn namespace initialization failure due to unavailable I/O
remap space which nvdimm core uses for temporary mapping.
nvdimm core can avoid this failure by only mapping the reserved info
block area to check for pfn superblock type and map the full namespace
resource only before using the namespace.
Given that personalities like BTT can be layered on top of any namespace
type create a generic form of devm_nsio_enable (devm_namespace_enable)
and use it inside the per-personality attach routines. Now
devm_namespace_enable() is always paired with disable unless the mapping
is going to be used for long term runtime access.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/20191017073308.32645-1-aneesh.kumar@linux.ibm.com
[djbw: reworks to move devm_namespace_{en,dis}able into *attach helpers]
Reported-by: kbuild test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20191031105741.102793-2-aneesh.kumar@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/nd-core.h')
| -rw-r--r-- | drivers/nvdimm/nd-core.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h index 25fa121104d0..96e8630f451c 100644 --- a/drivers/nvdimm/nd-core.h +++ b/drivers/nvdimm/nd-core.h @@ -171,6 +171,23 @@ ssize_t nd_namespace_store(struct device *dev, struct nd_pfn *to_nd_pfn_safe(struct device *dev); bool is_nvdimm_bus(struct device *dev); +#if IS_ENABLED(CONFIG_ND_CLAIM) +int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio, + resource_size_t size); +void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio); +#else +static inline int devm_nsio_enable(struct device *dev, + struct nd_namespace_io *nsio, resource_size_t size) +{ + return -ENXIO; +} + +static inline void devm_nsio_disable(struct device *dev, + struct nd_namespace_io *nsio) +{ +} +#endif + #ifdef CONFIG_PROVE_LOCKING extern struct class *nd_class; |