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feat(rme): change the default max GPT block size to 512MB

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Previously the max GPT block size was set to 2MB as a conservative
default. For workloads making use of SMMU in Normal world, and has
a Stage 2 block mapping of large sizes like 512MB or 1GB, then a
max GPT block size of 2MB may result in performance regression.
Hence this patch changes the default max GPT block size from 2MB to 512MB.

Change-Id: If90f12f494ec0f44d3e5974df8d58fcb528cfd34
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
This commit is contained in:
Soby Mathew 2024-08-22 11:53:09 +01:00
parent 4b6e4e618e
commit 01faa994ce
2 changed files with 2 additions and 2 deletions
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2
docs/getting_started/build-options.rst
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@ -848,7 +848,7 @@ Common build options
- ``RME_GPT_MAX_BLOCK``: Numeric value in MB to define the maximum size of
supported contiguous blocks in GPT Library. This parameter can take the
values 0, 2, 32 and 512. Setting this value to 0 disables use of Contigious
descriptors. Default value is 2.
descriptors. Default value is 512.
- ``ROT_KEY``: This option is used when ``GENERATE_COT=1``. It specifies a
file that contains the ROT private key in PEM format or a PKCS11 URI and

2
make_helpers/defaults.mk
View file

@ -146,7 +146,7 @@ GENERATE_COT := 0
RME_GPT_BITLOCK_BLOCK := 1
# Default maximum size of GPT contiguous block
RME_GPT_MAX_BLOCK := 2
RME_GPT_MAX_BLOCK := 512
# Hint platform interrupt control layer that Group 0 interrupts are for EL3. By
# default, they are for Secure EL1.