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path: root/drivers/misc/mic/scif/scif_mmap.c
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2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174Thomas Gleixner
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-08-30misc: mic: scif: use vma_pages().Muhammad Falak R Wani
Replace explicit computation of vma page count by a call to vma_pages() Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04misc: mic: SCIF remote memory map/unmap interfaceSudeep Dutt
This patch implements the SCIF mmap/munmap interface. A similar capability is provided to kernel clients via the scif_get_pages()/scif_put_pages() APIs. The SCIF mmap interface queries to check if a window is valid and then remaps the local virtual address to the remote physical pages. These mappings are subsequently destroyed upon receipt of the VMA close operation or scif_get_pages(). This functionality allows SCIF users to directly access remote memory without any driver interaction once the mappings are created thereby providing bare-metal PCIe latency. These mappings are zapped to avoid RMA accesses from user space, if a Coprocessor is reset. Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Reviewed-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>