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| author | Sahitya Tummala <stummala@codeaurora.org> | 2017-10-05 14:39:40 +0530 |
|---|---|---|
| committer | Gerrit - the friendly Code Review server <code-review@localhost> | 2018-08-16 08:00:12 -0700 |
| commit | 7b270ed1989f7dc0d9a2cd05fca0aaa5007550d4 (patch) | |
| tree | 43ebb630f79f3d77897bd4730808f884aa392744 /Documentation | |
| parent | 4bef50d041e80243d279ed1bccda5297b81ba306 (diff) | |
uio: msm_sharedmem: add guard page around shared memory
If guard_memory dtsi property is set, then the shared memory
region will be guarded by SZ_4K at the start and at the end.
This is needed to overcome the XPU limitation on few MSM HW,
so as to make this memory not contiguous with other allocations
that may possibly happen from other clients in the system.
Change-Id: I57637619cea8fe7f0f7254624e07177ea4a4fce0
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/uio/msm_sharedmem.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/uio/msm_sharedmem.txt b/Documentation/devicetree/bindings/uio/msm_sharedmem.txt index 749c6e856819..4c89846a9f64 100644 --- a/Documentation/devicetree/bindings/uio/msm_sharedmem.txt +++ b/Documentation/devicetree/bindings/uio/msm_sharedmem.txt @@ -9,10 +9,18 @@ Required properties: - reg-names : Indicates various client-names. - qcom,client-id : The client id for the QMI clients. +Optional properties: +- qcom,guard-memory: If this dtsi property is set, then the shared memory + region will be guarded by SZ_4K at the start and at the end. + This is needed to overcome the XPU limitation on few MSM HW, + so as to make this memory not contiguous with other allocations + that may possibly happen from other clients. + Example: qcom,msm_sharedmem@0dc80000 { compatible = "qcom,sharedmem-uio"; reg = <0x0dc80000 0x00180000>, reg-names = "rmtfs"; qcom,client-id = <0x00000001>; + qcom,guard-memory; }; |