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author | David S. Miller <davem@sunset.davemloft.net> | 2007-05-15 17:03:54 -0700 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2007-05-15 20:23:02 -0700 |
commit | c7754d465b1feade85b5f1c4492781a30f6652a2 (patch) | |
tree | 9a3b6ccb18983c1ea389377028ca51c8170730ef /arch/sparc64/kernel/smp.c | |
parent | 7b104bcb8e460e45a1aebe3da9b86aacdb4cab12 (diff) |
[SPARC64]: Add hypervisor API negotiation and fix console bugs.
Hypervisor interfaces need to be negotiated in order to use
some API calls reliably. So add a small set of interfaces
to request API versions and query current settings.
This allows us to fix some bugs in the hypervisor console:
1) If we can negotiate API group CORE of at least major 1
minor 1 we can use con_read and con_write which can improve
console performance quite a bit.
2) When we do a console write request, we should hold the
spinlock around the whole request, not a byte at a time.
What would happen is that it's easy for output from
different cpus to get mixed with each other.
3) Use consistent udelay() based polling, udelay(1) each
loop with a limit of 1000 polls to handle stuck hypervisor
console.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/smp.c')
0 files changed, 0 insertions, 0 deletions