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authorAndrew Banman <abanman@sgi.com>2016-09-21 11:09:20 -0500
committerIngo Molnar <mingo@kernel.org>2016-09-22 11:16:15 +0200
commit6d78059bbc0ace5461938aaea8cda95eb6719898 (patch)
treeeab1d365aaaa198aad847d203590f59b2535d2fe /arch/x86
parente879c1124a6c5c3367f20a254909605e7ee938c1 (diff)
x86/platform/uv/BAU: Fix payload queue setup on UV4 hardware
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/platform/uv/tlb_uv.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 72a5de7cf2e0..7ca0e5c31477 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -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)));
- tail = first;
- gnode = uv_gpa_to_gnode(uv_gpa(pqp));
- first = (gnode << UV_PAYLOADQ_GNODE_SHIFT) | tail;
- write_mmr_payload_tail(pnode, tail);
+ /*
+ * 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);