Messages in this thread Patch in this message | | | From | Logan Gunthorpe <> | Date | Fri, 21 Oct 2022 11:41:16 -0600 | Subject | [PATCH v11 9/9] ABI: sysfs-bus-pci: add documentation for p2pmem allocate |
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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> --- Documentation/ABI/testing/sysfs-bus-pci | 10 ++++++++++ 1 file changed, 10 insertions(+)
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 -- 2.30.2
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