diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-06-26 14:27:07 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-07-02 19:32:44 +0200 |
| commit | 3ed2dcdf54d5bf1f9823b5faf1a702e7cee53982 (patch) | |
| tree | f025d9105611d1c4d90d3265176e79a71d1b83a8 /include | |
| parent | mm: factor out a devm_request_free_mem_region helper (diff) | |
| download | linux-3ed2dcdf54d5bf1f9823b5faf1a702e7cee53982.tar.xz linux-3ed2dcdf54d5bf1f9823b5faf1a702e7cee53982.zip | |
memremap: validate the pagemap type passed to devm_memremap_pages
Most pgmap types are only supported when certain config options are
enabled. Check for a type that is valid for the current configuration
before setting up the pagemap. For this the usage of the 0 type for
device dax gets replaced with an explicit MEMORY_DEVICE_DEVDAX type.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/memremap.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 995c62c5a48b..0c86f2c5ac9c 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -45,13 +45,21 @@ struct vmem_altmap { * wakeup is used to coordinate physical address space management (ex: * fs truncate/hole punch) vs pinned pages (ex: device dma). * + * MEMORY_DEVICE_DEVDAX: + * Host memory that has similar access semantics as System RAM i.e. DMA + * coherent and supports page pinning. In contrast to + * MEMORY_DEVICE_FS_DAX, this memory is access via a device-dax + * character device. + * * MEMORY_DEVICE_PCI_P2PDMA: * Device memory residing in a PCI BAR intended for use with Peer-to-Peer * transactions. */ enum memory_type { + /* 0 is reserved to catch uninitialized type fields */ MEMORY_DEVICE_PRIVATE = 1, MEMORY_DEVICE_FS_DAX, + MEMORY_DEVICE_DEVDAX, MEMORY_DEVICE_PCI_P2PDMA, }; |