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authorGravatar Joao Martins <joao.m.martins@oracle.com> 2022-01-14 14:04:33 -0800
committerGravatar Linus Torvalds <torvalds@linux-foundation.org> 2022-01-15 16:30:25 +0200
commitfc65c4eb0b2a27c30d35636650e3f4ddb07506cd (patch)
treeccc248ca22f02aa8b03d0d73e8eb241cee53c1c5 /drivers/dax/bus.h
parentdevice-dax: use struct_size() (diff)
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device-dax: ensure dev_dax->pgmap is valid for dynamic devices
Right now, only static dax regions have a valid @pgmap pointer in its struct dev_dax. Dynamic dax case however, do not. In preparation for device-dax compound devmap support, make sure that dev_dax pgmap field is set after it has been allocated and initialized. dynamic dax device have the @pgmap is allocated at probe() and it's managed by devm (contrast to static dax region which a pgmap is provided and dax core kfrees it). So in addition to ensure a valid @pgmap, clear the pgmap when the dynamic dax device is released to avoid the same pgmap ranges to be re-requested across multiple region device reconfigs. Add a static_dev_dax() and use that helper in dev_dax_probe() to ensure the initialization differences between dynamic and static regions are more explicit. While at it, consolidate the ranges initialization when we allocate the @pgmap for the dynamic dax region case. Also take the opportunity to document the differences between static and dynamic da regions. Link: https://lkml.kernel.org/r/20211202204422.26777-8-joao.m.martins@oracle.com Suggested-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Jane Chu <jane.chu@oracle.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/dax/bus.h')
-rw-r--r--drivers/dax/bus.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dax/bus.h b/drivers/dax/bus.h
index 1e946ad7780a..4acdfee7dd59 100644
--- a/drivers/dax/bus.h
+++ b/drivers/dax/bus.h
@@ -48,6 +48,7 @@ int __dax_driver_register(struct dax_device_driver *dax_drv,
__dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
void dax_driver_unregister(struct dax_device_driver *dax_drv);
void kill_dev_dax(struct dev_dax *dev_dax);
+bool static_dev_dax(struct dev_dax *dev_dax);
#if IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)
int dev_dax_probe(struct dev_dax *dev_dax);