linux-kernel - [PATCH] x86: UV BAU distribution and payload MMRs

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Message-Id: <E1LuR5Z-0007An-B8@eag09.americas.sgi.com>
Date:	Thu, 16 Apr 2009 07:53:09 -0500
From:	Cliff Wickman <cpw@....com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu
Subject: [PATCH] x86: UV BAU distribution and payload MMRs


From: Cliff Wickman <cpw@....com>

This patch correctly sets BAU memory mapped registers to point
to the sending activation descriptor table and target payload table.

The "Broadcast Assist Unit" is used for TLB shootdown in UV.

The memory mapped registers that point to sending and receiving
memory structures contain node numbers.
In one case the __pa() function did not provide the node id of
memory on blade zero in configurations where that id is nonzero.
In another case, it was assumed that memory was allocated on
the local node.  That assumption is not true in a configuration
in which the node has no memory.

Tested on the UV hardware simulator.

Diffed against 2.6.29

Signed-off-by: Cliff Wickman <cpw@....com>

---
 arch/x86/kernel/tlb_uv.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

Index: linux/arch/x86/kernel/tlb_uv.c
===================================================================
--- linux.orig/arch/x86/kernel/tlb_uv.c
+++ linux/arch/x86/kernel/tlb_uv.c
@@ -718,7 +718,7 @@ uv_activation_descriptor_init(int node, 
 	adp = (struct bau_desc *)kmalloc_node(16384, GFP_KERNEL, node);
 	BUG_ON(!adp);
 
-	pa = __pa((unsigned long)adp);
+	pa = uv_gpa(adp); /* need the real nasid*/
 	n = pa >> uv_nshift;
 	m = pa & uv_mmask;
 
@@ -755,6 +755,8 @@ static struct bau_payload_queue_entry * 
 uv_payload_queue_init(int node, int pnode, struct bau_control *bau_tablesp)
 {
 	struct bau_payload_queue_entry *pqp;
+	unsigned long pa;
+	int pn;
 	char *cp;
 
 	pqp = (struct bau_payload_queue_entry *) kmalloc_node(
@@ -765,10 +767,14 @@ uv_payload_queue_init(int node, int pnod
 	cp = (char *)pqp + 31;
 	pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5);
 	bau_tablesp->va_queue_first = pqp;
+	/*
+	 * need the pnode of where the memory was really allocated
+	 */
+	pa = uv_gpa(pqp);
+	pn = pa >> uv_nshift;
 	uv_write_global_mmr64(pnode,
 			      UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST,
-			      ((unsigned long)pnode <<
-			       UV_PAYLOADQ_PNODE_SHIFT) |
+			      ((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) |
 			      uv_physnodeaddr(pqp));
 	uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL,
 			      uv_physnodeaddr(pqp));
--
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