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dkim=pass header.d=deltatee.com header.s=20200525 header.b=bgCCyiC8; spf=pass (imf16.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com; dmarc=pass (policy=none) header.from=deltatee.com X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 02A9F18003B X-HE-Tag: 1666374089-666781 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 Reviewed-by: John Hubbard Reviewed-by: Greg Kroah-Hartman Reviewed-by: Chaitanya Kulkarni --- 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 +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