cancel
Showing results for 
Search instead for 
Did you mean: 

OpenCL

yhwan
Journeyman III

How to flush GPU's L2 cache

Hello, I'm working with Carrizo APU (GCN3). I'm trying to figure out how I can flush GPU's cache so that cached data in GPU is explicitly flushed to physical memory (which will let CPU see the updated value). By going through GCN3 instruction manual, I found assembly instructions that write back L1 (s_dcache_wb) and scalar data cache (s_dcache_wb_vol). However, I couldn't find any information on how to flush L2 cache. Is there any instruction or way to explicitly flush GPU's L2 cache? Thank you!

Tags (4)
0 Likes
Reply
1 Reply
dipak
Staff
Staff

Re: How to flush GPU's L2 cache

Hi,

If you're simply asking about the ISA instruction, then no. As I checked, there is no ISA instruction to flush the L2 cache.

Knowing the usage may help us to provide more information in this regard. Say, if SVM atomics are used on fine-grained SVM, then, the host or CPU can see the modifications done by GPU device(s).

Regards,

0 Likes
Reply