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freedreno/regs: Document CP_MEM_TO_SCRATCH_MEM

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Best guess is that it is a faster way to fetch all the VSC_STATE registers
and keep them in a local scratch memory instead of fetching every time
when skipping IBs.

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23881>
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Danylo Piliaiev 2023-07-05 15:49:19 +02:00 • committed by Marge Bot
parent 912bafbdd5
commit ed6394fda7
1 changed files with 27 additions and 1 deletions
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28
src/freedreno/registers/adreno/adreno_pm4.xml
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@ -624,7 +624,12 @@ xsi:schemaLocation="http://nouveau.freedesktop.org/ rules-ng.xsd">
<value name="CP_BV_BR_COUNT_OPS" value="0x1b" variants="A7XX-"/> <!-- payload 1 or 2 dwords -->
<!-- similar to CP_CONTEXT_REG_BUNCH, but discards first two dwords?? -->
<value name="CP_CONTEXT_REG_BUNCH2" value="0x5d" variants="A7XX-"/>
<value name="CP_UNK49" value="0x49" variants="A7XX-"/> <!-- payload 4 dwords, last two address of something -->
<doc>
Write to a scratch memory that is read by CP_REG_TEST with
SOURCE_SCRATCH_MEM set. It's not the same scratch as scratch registers.
However it uses the same memory space.
</doc>
<value name="CP_MEM_TO_SCRATCH_MEM" value="0x49" variants="A7XX-"/>
<doc>
Executes an array of fixed-size command buffers where each
@ -1975,6 +1980,27 @@ opcode: CP_LOAD_STATE4 (30) (4 dwords)
<reg32 offset="3" name="TIMESTAMP" type="uint"/>
</domain>
<domain name="CP_MEM_TO_SCRATCH_MEM" width="32">
<doc>
Best guess is that it is a faster way to fetch all the VSC_STATE registers
and keep them in a local scratch memory instead of fetching every time
when skipping IBs.
</doc>
<reg32 offset="0" name="0">
<bitfield name="CNT" low="0" high="5" type="uint"/>
</reg32>
<reg32 offset="1" name="1">
<doc>Scratch memory size is 48 dwords`</doc>
<bitfield name="OFFSET" low="0" high="5" type="uint"/>
</reg32>
<reg32 offset="2" name="2">
<bitfield name="SRC" low="0" high="31"/>
</reg32>
<reg32 offset="3" name="3">
<bitfield name="SRC_HI" low="0" high="31"/>
</reg32>
</domain>
<domain name="CP_THREAD_CONTROL" width="32">
<enum name="cp_thread">
<value name="CP_SET_THREAD_BR" value="1"/> <!-- Render -->