linux-kernel - [PATCH 1/6] x86/platform/uv/BAU: Add uv_bau

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Date:   Fri, 17 Feb 2017 16:06:32 -0600
From:   Andrew Banman <abanman@....com>
To:     tglx@...utronix.de
Cc:     mingo@...hat.com, akpm@...ux-foundation.org, hpa@...or.com,
        mike.travis@....com, rja@....com, sivanich@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org, abanman@....com
Subject: [PATCH 1/6] x86/platform/uv/BAU: Add uv_bau_version enumerated constants

Define enumerated constants for each UV hub version and replace magic
numbers with the appropriate constant. This makes our checks against
uvhub_version more robust, and any use of unsupported archs will be
caught during compilation.

Signed-off-by: Andrew Banman <abanman@....com>
Acked-by: Mike Travis <mike.travis@....com>
---
 arch/x86/include/asm/uv/uv_bau.h |  7 +++++++
 arch/x86/platform/uv/tlb_uv.c    | 16 ++++++++--------
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h
index 57ab86d..768093f 100644
--- a/arch/x86/include/asm/uv/uv_bau.h
+++ b/arch/x86/include/asm/uv/uv_bau.h
@@ -185,6 +185,13 @@
 #define MSG_REGULAR			1
 #define MSG_RETRY			2
 
+enum uv_bau_version {
+	UV_BAU_V1 = 1,
+	UV_BAU_V2,
+	UV_BAU_V3,
+	UV_BAU_V4,
+};
+
 /*
  * Distribution: 32 bytes (256 bits) (bytes 0-0x1f of descriptor)
  * If the 'multilevel' flag in the header portion of the descriptor
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index f25982c..f4f5aa6 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -724,7 +724,7 @@ static int wait_completion(struct bau_desc *bau_desc, struct bau_control *bcp, l
 		right_shift = ((desc - UV_CPUS_PER_AS) * UV_ACT_STATUS_SIZE);
 	}
 
-	if (bcp->uvhub_version == 1)
+	if (bcp->uvhub_version == UV_BAU_V1)
 		return uv1_wait_completion(bau_desc, mmr_offset, right_shift, bcp, try);
 	else
 		return uv2_3_wait_completion(bau_desc, mmr_offset, right_shift, bcp, try);
@@ -918,7 +918,7 @@ int uv_flush_send_and_wait(struct cpumask *flush_mask, struct bau_control *bcp,
 	struct uv1_bau_msg_header *uv1_hdr = NULL;
 	struct uv2_3_bau_msg_header *uv2_3_hdr = NULL;
 
-	if (bcp->uvhub_version == 1) {
+	if (bcp->uvhub_version == UV_BAU_V1) {
 		uv1 = 1;
 		uv1_throttle(hmaster, stat);
 	}
@@ -1296,7 +1296,7 @@ void uv_bau_message_interrupt(struct pt_regs *regs)
 
 		msgdesc.msg_slot = msg - msgdesc.queue_first;
 		msgdesc.msg = msg;
-		if (bcp->uvhub_version == 2)
+		if (bcp->uvhub_version == UV_BAU_V2)
 			process_uv2_message(&msgdesc, bcp);
 		else
 			/* no error workaround for uv1 or uv3 */
@@ -1838,7 +1838,7 @@ static void pq_init(int node, int pnode)
 	 * and the payload queue tail must be maintained by the kernel.
 	 */
 	bcp = &per_cpu(bau_control, smp_processor_id());
-	if (bcp->uvhub_version <= 3) {
+	if (bcp->uvhub_version <= UV_BAU_V3) {
 		tail = first;
 		gnode = uv_gpa_to_gnode(uv_gpa(pqp));
 		first = (gnode << UV_PAYLOADQ_GNODE_SHIFT) | tail;
@@ -2052,13 +2052,13 @@ static int scan_sock(struct socket_desc *sdp, struct uvhub_desc *bdp,
 		bcp->socket_master = *smasterp;
 		bcp->uvhub = bdp->uvhub;
 		if (is_uv1_hub())
-			bcp->uvhub_version = 1;
+			bcp->uvhub_version = UV_BAU_V1;
 		else if (is_uv2_hub())
-			bcp->uvhub_version = 2;
+			bcp->uvhub_version = UV_BAU_V2;
 		else if (is_uv3_hub())
-			bcp->uvhub_version = 3;
+			bcp->uvhub_version = UV_BAU_V3;
 		else if (is_uv4_hub())
-			bcp->uvhub_version = 4;
+			bcp->uvhub_version = UV_BAU_V4;
 		else {
 			pr_emerg("uvhub version not 1, 2, 3, or 4\n");
 			return 1;
-- 
1.8.2.1