| Message ID | 20220922163926.7077-9-logang@deltatee.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Userspace P2PDMA with O_DIRECT NVMe devices | expand |
On Thu, Sep 22, 2022 at 10:39:26AM -0600, Logan Gunthorpe wrote: > 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> > --- > Documentation/ABI/testing/sysfs-bus-pci | 10 ++++++++++ > 1 file changed, 10 insertions(+) Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 6fc2c2efe8ab..f4602b8d6e11 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