On 5/30/23 18:11, Frederic Barrat wrote:
The Thread Interrupt Management Area (TIMA) can be accessed through 4
ports/snoop buses, targeted by the address. The base address of a TIMA
is using port 0 and the other ports are 0x80 apart. Using one port or
another can be useful to balance the load on the snoop buses.
and can we have some nice examples of how these ports are used ? only for
snooping or also for balancing operations ? which ones ?
The TIMA registers are in the 0x0 -> 0x3F range and there are 2
indication bits for special operations (bits 10 and 11; everything
fits on a 4k page). So the port address bits fall in between and are
"don't care" for the hardware when processing the TIMA operation. So
this patch filters out those port address bits so that a TIMA
operation can be triggered using any port.
It is also true for indirect access (through the IC BAR) and it's
actually nothing new, it was already the case on P9. Which helps here,
as the TIMA handling code is common between P9 (xive) and P10 (xive2).
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>