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x86/platform/uv/BAU: Fix payload queue setup on UV4 hardware

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The BAU on UV4 does not need to maintain the payload queue tail pointer. Do
not initialize the tail pointer MMR on UV4.

Note that write_payload_tail is not an abstracted BAU function since it is
an operation specific to pre-UV4 versions. Then we must switch on the UV
version to control its usage, for which we use uvhub_version rather than
is_uv*_hub because it is quicker/more concise.

Signed-off-by: Andrew Banman <abanman@sgi.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Mike Travis <travis@sgi.com>
Acked-by: Dimitri Sivanich <sivanich@sgi.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: akpm@linux-foundation.org
Cc: rja@sgi.com
Link: http://lkml.kernel.org/r/1474474161-265604-10-git-send-email-abanman@sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andrew Banman 2016-09-21 11:09:20 -05:00 committed by Ingo Molnar
parent e879c1124a
commit 6d78059bbc
1 changed files with 12 additions and 4 deletions
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10
arch/x86/platform/uv/tlb_uv.c
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@ -1826,11 +1826,19 @@ static void pq_init(int node, int pnode)
first = ops.bau_gpa_to_offset(uv_gpa(pqp));
last = ops.bau_gpa_to_offset(uv_gpa(pqp + (DEST_Q_SIZE - 1)));
/*
* Pre UV4, the gnode is required to locate the payload queue
* and the payload queue tail must be maintained by the kernel.
*/
bcp = &per_cpu(bau_control, smp_processor_id());
if (bcp->uvhub_version <= 3) {
tail = first;
gnode = uv_gpa_to_gnode(uv_gpa(pqp));
first = (gnode << UV_PAYLOADQ_GNODE_SHIFT) | tail;
write_mmr_payload_tail(pnode, tail);
}
ops.write_payload_first(pnode, first);
ops.write_payload_last(pnode, last);
ops.write_g_sw_ack(pnode, 0xffffUL);