From: Bob Picco <bpicco@xxxxxxxxxx> Date: Sun, 7 Sep 2014 11:45:07 -0400 > From: bob picco <bpicco@xxxxxxxxxx> > > This patch attempts to do a few things. The highlights are: 1) provides the > option to enable SPARSE_IRQ, 2) allocates ivector_table at boot time and > 3) default to cookie only VIRQ mechanism for supported firmware. The > first firmware with cookie only support for me appears on T5. You can > optionally force the HV firmware to not cookie only mode which is the > sysino support. > > The sysino is a deprecated HV mechanism according to the most recent > SPARC Virtual Machine Specification. HV_GRP_INTR is what controls the > cookie/sysino firmware versioning. The history appears to be something like > this: > major version 2 was dropped. > major version 3 is where a cookie only VIRQ > is possible. Using version 3 means ivector_table isn't required. > > A new boot option is provided should cookie only HV support have issues. > hvirq - this is the version for HV_GRP_INTR. This is related to HV API > versioning. The code attempts major=3 first by default. The option can > be used to override this default. > > I've tested with SPARSE_IRQ on T5-8, M7-4 and T4-X and Ultra 45. I've also > tested Ultra45 (Jalap?no) with !SPARSE_IRQ. > > Cc: sparclinux@xxxxxxxxxxxxxxx > Signed-off-by: Bob Picco <bob.picco@xxxxxxxxxx> Let's just bite the bullet and enable SPARSE_IRQ unconditionally on SPARC64. That will decrease the vmlinux image size and increase the testing coverage of SPARSE_IRQ. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
