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ABI: sysfs-bus-pci: add documentation for p2pmem allocate 

Add documentation for the p2pmem/allocate binary file which allows
for allocating p2pmem buffers in userspace for passing to drivers
that support them. (Currently only O_DIRECT to NVMe devices.)

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20221021174116.7200-10-logang@deltatee.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Logan Gunthorpe 2022-10-21 11:41:16 -06:00 committed by Jens Axboe
parent 7e9c7ef83d
commit 6d4338cb40
1 changed files with 10 additions and 0 deletions
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10
Documentation/ABI/testing/sysfs-bus-pci
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@ -407,6 +407,16 @@ Description:
file contains a '1' if the memory has been published for
use outside the driver that owns the device.
What: /sys/bus/pci/devices/.../p2pmem/allocate
Date: August 2022
Contact: Logan Gunthorpe <logang@deltatee.com>
Description:
This file allows mapping p2pmem into userspace. For each
mmap() call on this file, the kernel will allocate a chunk
of Peer-to-Peer memory for use in Peer-to-Peer transactions.
This memory can be used in O_DIRECT calls to NVMe backed
files for Peer-to-Peer copies.
What: /sys/bus/pci/devices/.../link/clkpm
/sys/bus/pci/devices/.../link/l0s_aspm
/sys/bus/pci/devices/.../link/l1_aspm