diff options
| author | Logan Gunthorpe <logang@deltatee.com> | 2022-10-21 11:41:16 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-11-09 11:29:21 -0700 |
| commit | 6d4338cb4070a762dba0cadee00b7ec206d9f868 (patch) | |
| tree | aa2d47f5dc88bc4980b0291a51d340594e5180d3 /Documentation/ABI | |
| parent | 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8 (diff) | |
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>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-pci | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 840727fc75dc..ecf47559f495 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -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 |