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Behavior of DSB with early write acknowledgement device memory attribute

jatron

Suppose software does a write to device memory that allows early write acknowledgement, then executes a DSB instruction.

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*device_memory = 1; /* Suppose the memory type is Device-nGnRE */
asm volatile("dsb sy" : : : "memory");
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Because the memory type is Device-nGnRE, the memory system can return a write acknowledgement before the write has reached its endpoint. Does this mean the DSB instruction can complete before the write has reached its endpoint? Could someone point me to a section of the "Armv8 Architecture Reference Manual" that explains this?

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