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| author | Jérôme Glisse <jglisse@redhat.com> | 2017-09-08 16:12:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-08 18:26:46 -0700 |
| commit | df6ad69838fc9dcdbee0dcf2fc2c6f1113f8d609 (patch) | |
| tree | d5774eba9a9c2204123b8ca36d9cba90bfa9ad64 /mm/Kconfig | |
| parent | 8315ada7f095bfa2cae0cd1e915b95bf6226897d (diff) | |
| download | lwn-df6ad69838fc9dcdbee0dcf2fc2c6f1113f8d609.tar.gz lwn-df6ad69838fc9dcdbee0dcf2fc2c6f1113f8d609.zip | |
mm/device-public-memory: device memory cache coherent with CPU
Platform with advance system bus (like CAPI or CCIX) allow device memory
to be accessible from CPU in a cache coherent fashion. Add a new type of
ZONE_DEVICE to represent such memory. The use case are the same as for
the un-addressable device memory but without all the corners cases.
Link: http://lkml.kernel.org/r/20170817000548.32038-19-jglisse@redhat.com
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: David Nellans <dnellans@nvidia.com>
Cc: Evgeny Baskakov <ebaskakov@nvidia.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mark Hairgrove <mhairgrove@nvidia.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Sherry Cheung <SCheung@nvidia.com>
Cc: Subhash Gutti <sgutti@nvidia.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Bob Liu <liubo95@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index ec27855db133..7bea16697d87 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -720,12 +720,23 @@ config HMM_MIRROR config DEVICE_PRIVATE bool "Unaddressable device memory (GPU memory, ...)" depends on ARCH_HAS_HMM + select HMM help Allows creation of struct pages to represent unaddressable device memory; i.e., memory that is only accessible from the device (or group of devices). You likely also want to select HMM_MIRROR. +config DEVICE_PUBLIC + bool "Addressable device memory (like GPU memory)" + depends on ARCH_HAS_HMM + select HMM + + help + Allows creation of struct pages to represent addressable device + memory; i.e., memory that is accessible from both the device and + the CPU + config FRAME_VECTOR bool |