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mm/hmm/mirror: mirror process address space on device with HMM helpers

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This is a heterogeneous memory management (HMM) process address space
mirroring.  In a nutshell this provide an API to mirror process address
space on a device.  This boils down to keeping CPU and device page table
synchronize (we assume that both device and CPU are cache coherent like
PCIe device can be).

This patch provide a simple API for device driver to achieve address space
mirroring thus avoiding each device driver to grow its own CPU page table
walker and its own CPU page table synchronization mechanism.

This is useful for NVidia GPU >= Pascal, Mellanox IB >= mlx5 and more
hardware in the future.

[[email protected]: fix hmm for "mmu_notifier kill invalidate_page callback"]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jérôme Glisse <[email protected]>
Signed-off-by: Evgeny Baskakov <[email protected]>
Signed-off-by: John Hubbard <[email protected]>
Signed-off-by: Mark Hairgrove <[email protected]>
Signed-off-by: Sherry Cheung <[email protected]>
Signed-off-by: Subhash Gutti <[email protected]>
Cc: Aneesh Kumar <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: David Nellans <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Ross Zwisler <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Cc: Bob Liu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jérôme Glisse 2017-09-08 16:11:27 -07:00 • committed by Linus Torvalds
commit c0b124054f
3 changed files with 260 additions and 15 deletions
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12
mm/Kconfig
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@ -705,6 +705,18 @@ config ARCH_HAS_HMM
config HMM
bool
config HMM_MIRROR
bool "HMM mirror CPU page table into a device page table"
depends on ARCH_HAS_HMM
select MMU_NOTIFIER
select HMM
help
Select HMM_MIRROR if you want to mirror range of the CPU page table of a
process into a device page table. Here, mirror means "keep synchronized".
Prerequisites: the device must provide the ability to write-protect its
page tables (at PAGE_SIZE granularity), and must be able to recover from
the resulting potential page faults.
config FRAME_VECTOR
bool