Hi Jason, Thanks for the reply and the code example! As a workaround, I was using a direct connection between multiple cores and one accelerator with a vector of ports, but I will definitely change to your approach.
Cheers, Jeckson Dellagostin Souza PhD Student Instituto de Informática Universidade Federal do Rio Grande do Sul 2018-04-19 12:22 GMT-03:00 Jason Lowe-Power <[email protected]>: > Hi Jeckson, > > [Note: Just found this in my drafts. Sorry for the slow reply.] > > You could use memory-mapped I/O regions by using it as a PIODevice. > Essentially, you can set up your accelerator to only respond to certain > physical addresses by implementing getAddrRanges() to return just those > addresses. Then, the CPU could read/write those addresses and communicate > with your accelerator. This is similar to how devices work in real life. > > Memory-mapped I/O is simple to set up in SE mode. However, in FS mode it's > more complicated since you actually have to write a kernel driver. > > Here's an example accelerator like you described: https://github.com/ > powerjg/gem5/tree/devel/accel/src/accel. That branch (devel/accel) has > all of the necessary code. > > Cheers, > Jason > > ----------- > Jason Lowe-Power > Assistant Professor, Computer Science Department > University of California, Davis > 3049 Kemper Hall > https://faculty.engineering.ucdavis.edu/lowepower/ > > > > On Wed, Apr 4, 2018 at 8:30 AM Jeckson Souza <[email protected]> wrote: > >> Hi all, >> I'm trying to send instructions from a CPU to an accelerator through a >> SystemXBar (I need the bus as, eventually, I'll add more of these >> components to the system). >> In my first attempt, I tried to create ports on the CPU/accelerator >> similar to the ones used as memory ports so I could use the >> existing xbar to communicate. However, these Master/SlavePorts require me >> to use Packets and Requests, which, if I understand correctly, are tied to >> valid memory addresses. >> Does anybody know if there is an implemented bus/port type which I could >> use in this case? >> >> Regards, >> Jeckson >> _______________________________________________ >> gem5-users mailing list >> [email protected] >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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