linux-kernel - [PATCH 6/6] x86/platform/uv/BAU: Add payload descriptor qualifier

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Date:   Tue, 14 Feb 2017 19:58:51 -0600
From:   Andrew Banman <abanman@....com>
To:     mingo@...hat.com
Cc:     akpm@...ux-foundation.org, tglx@...utronix.de, hpa@...or.com,
        mike.travis@....com, rja@....com, sivanich@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org, abanman@....com
Subject: [PATCH 6/6] x86/platform/uv/BAU: Add payload descriptor qualifier

On UV4, the destination agent verifies each message by checking the
descriptor qualifier field of the message payload. Messages without this
field set to 0x534749 will cause a hub error to assert. Make this the
default action for future architectures, anticipating they will have
the same requirement.


Signed-off-by: Andrew Banman <abanman@....com>
Acked-by: Mike Travis <mike.travis@....com>
---
 arch/x86/include/asm/uv/uv_bau.h | 23 +++++++++++++++++++++--
 arch/x86/platform/uv/tlb_uv.c    | 22 +++++++++++++++++++---
 2 files changed, 40 insertions(+), 5 deletions(-)

Index: community/arch/x86/include/asm/uv/uv_bau.h
===================================================================
--- community.orig/arch/x86/include/asm/uv/uv_bau.h
+++ community/arch/x86/include/asm/uv/uv_bau.h
@@ -185,6 +185,8 @@
 #define MSG_REGULAR			1
 #define MSG_RETRY			2
 
+#define BAU_DESC_QUALIFIER		0x534749
+
 /*
  * Distribution: 32 bytes (256 bits) (bytes 0-0x1f of descriptor)
  * If the 'multilevel' flag in the header portion of the descriptor
@@ -225,7 +227,7 @@ struct bau_local_cpumask {
 /*
  * The payload is software-defined for INTD transactions
  */
-struct bau_msg_payload {
+struct uv1_2_3_bau_msg_payload {
 	unsigned long	address;		/* signifies a page or all
 						   TLB's of the cpu */
 	/* 64 bits */
@@ -236,6 +238,20 @@ struct bau_msg_payload {
 	unsigned int	reserved1:32;		/* not usable */
 };
 
+struct uv4_bau_msg_payload {
+	unsigned long	address;		/* signifies a page or all
+						 * TLB's of the cpu
+						 */
+	/* 64 bits */
+	unsigned short	sending_cpu;		/* filled in by sender */
+	/* 16 bits */
+	unsigned short	acknowledge_count;	/* filled in by destination */
+	/* 16 bits */
+	unsigned int	reserved1:8;		/* not usable */
+	unsigned int	qualifier:24;		/* descriptor qualifier filled
+						 * in by sender
+						 */
+};
 
 /*
  * UV1 Message header:  16 bytes (128 bits) (bytes 0x30-0x3f of descriptor)
@@ -400,7 +416,10 @@ struct bau_desc {
 		struct uv2_3_bau_msg_header	uv2_3_hdr;
 	} header;
 
-	struct bau_msg_payload			payload;
+	union bau_payload_header {
+		struct uv1_2_3_bau_msg_payload	uv1_2_3;
+		struct uv4_bau_msg_payload	uv4;
+	} payload;
 };
 /* UV1:
  *   -payload--    ---------header------
Index: community/arch/x86/platform/uv/tlb_uv.c
===================================================================
--- community.orig/arch/x86/platform/uv/tlb_uv.c
+++ community/arch/x86/platform/uv/tlb_uv.c
@@ -1200,6 +1200,7 @@ const struct cpumask *uv_flush_tlb_other
 	struct bau_control *bcp;
 	unsigned long descriptor_status;
 	unsigned long status;
+	unsigned long address;
 
 	bcp = &per_cpu(bau_control, cpu);
 
@@ -1248,10 +1249,25 @@ const struct cpumask *uv_flush_tlb_other
 	record_send_statistics(stat, locals, hubs, remotes, bau_desc);
 
 	if (!end || (end - start) <= PAGE_SIZE)
-		bau_desc->payload.address = start;
+		address = start;
 	else
-		bau_desc->payload.address = TLB_FLUSH_ALL;
-	bau_desc->payload.sending_cpu = cpu;
+		address = TLB_FLUSH_ALL;
+
+	switch (bcp->uvhub_version) {
+	case 1:
+	case 2:
+	case 3:
+		bau_desc->payload.uv1_2_3.address = address;
+		bau_desc->payload.uv1_2_3.sending_cpu = cpu;
+		break;
+	case 4:
+	default:
+		bau_desc->payload.uv4.address = address;
+		bau_desc->payload.uv4.sending_cpu = cpu;
+		bau_desc->payload.uv4.qualifier = BAU_DESC_QUALIFIER;
+		break;
+	}
+
 	/*
 	 * uv_flush_send_and_wait returns 0 if all cpu's were messaged,
 	 * or 1 if it gave up and the original cpumask should be returned.