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| author |   Ben Widawsky <ben.widawsky@intel.com> | 2021-02-16 20:09:53 -0800 |
|---|---|---|
| committer |   Dan Williams <dan.j.williams@intel.com> | 2021-02-16 20:36:38 -0800 |
| commit | 583fa5e71caeb79e04e477e9837e2f7fa53b71e4 (patch) | |
| tree | 86f2720d26afc073b5460acd08a0e10d493299d9 /Documentation/userspace-api/ioctl | |
| parent | cxl/mem: Register CXL memX devices (diff) | |
| download | linux-dev-583fa5e71caeb79e04e477e9837e2f7fa53b71e4.tar.xz linux-dev-583fa5e71caeb79e04e477e9837e2f7fa53b71e4.zip | |
cxl/mem: Add basic IOCTL interface
Add a straightforward IOCTL that provides a mechanism for userspace to
query the supported memory device commands. CXL commands as they appear
to userspace are described as part of the UAPI kerneldoc. The command
list returned via this IOCTL will contain the full set of commands that
the driver supports, however, some of those commands may not be
available for use by userspace.
Memory device commands first appear in the CXL 2.0 specification. They
are submitted through a mailbox mechanism specified in the CXL 2.0
specification.
The send command allows userspace to issue mailbox commands directly to
the hardware. The list of available commands to send are the output of
the query command. The driver verifies basic properties of the command
and possibly inspect the input (or output) payload to determine whether
or not the command is allowed (or might taint the kernel).
Reported-by: kernel test robot <lkp@intel.com> # bug in earlier revision
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com> (v2)
Cc: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20210217040958.1354670-5-ben.widawsky@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'Documentation/userspace-api/ioctl')
| -rw-r--r-- | Documentation/userspace-api/ioctl/ioctl-number.rst | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index a4c75a28c839..6eb8e634664d 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -352,6 +352,7 @@ Code Seq# Include File Comments <mailto:michael.klein@puffin.lb.shuttle.de> 0xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver 0xCD 01 linux/reiserfs_fs.h +0xCE 01-02 uapi/linux/cxl_mem.h Compute Express Link Memory Devices 0xCF 02 fs/cifs/ioctl.c 0xDB 00-0F drivers/char/mwave/mwavepub.h 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/ |