x86, UV: Correct UV2 BAU destination timeout

Correct the UV2 broacast assist unit's destination timeout
period. And the activation status register in UV2 should be
tested for a destination timeout with a 4, not a 2.  The values
for Active versus Timeout were reversed.

This patch is critical for TLB shootdown on an Altix UV2 system
(i.e. the follow-on to the current Altix UV).

 Destination timeout period:
  The period is set in 4 bits of memory-mapped register MISC_CONTROL.
  The left bit toggles base period between 10us and 80us.
  The other 3 bits are the multiplier.
 Decimal 15, hex f, gives the maximum: 7 * 80us

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Link: http://lkml.kernel.org/r/20110621122243.117324443@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h
index 16ce58c..37d3698 100644 (file)
--- a/arch/x86/include/asm/uv/uv_bau.h
+++ b/arch/x86/include/asm/uv/uv_bau.h
@@ -67,7 +67,7 @@
  *  we're using 655us, similar to UV1: 65 units of 10us
  */
 #define UV1_INTD_SOFT_ACK_TIMEOUT_PERIOD (9UL)
-#define UV2_INTD_SOFT_ACK_TIMEOUT_PERIOD (65*10UL)
+#define UV2_INTD_SOFT_ACK_TIMEOUT_PERIOD (15UL)
 
 #define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD        (is_uv1_hub() ?                 \
                UV1_INTD_SOFT_ACK_TIMEOUT_PERIOD :                      \
@@ -106,12 +106,20 @@
 #define DS_SOURCE_TIMEOUT              3
 /*
  * bits put together from HRP_LB_BAU_SB_ACTIVATION_STATUS_0/1/2
- * values 1 and 5 will not occur
+ * values 1 and 3 will not occur
+ *        Decoded meaning              ERROR  BUSY    AUX ERR
+ * -------------------------------     ----   -----   -------
+ * IDLE                                 0       0        0
+ * BUSY (active)                        0       1        0
+ * SW Ack Timeout (destination)         1       0        0
+ * SW Ack INTD rejected (strong NACK)   1       0        1
+ * Source Side Time Out Detected        1       1        0
+ * Destination Side PUT Failed          1       1        1
  */
 #define UV2H_DESC_IDLE                 0
-#define UV2H_DESC_DEST_TIMEOUT         2
-#define UV2H_DESC_DEST_STRONG_NACK     3
-#define UV2H_DESC_BUSY                 4
+#define UV2H_DESC_BUSY                 2
+#define UV2H_DESC_DEST_TIMEOUT         4
+#define UV2H_DESC_DEST_STRONG_NACK     5
 #define UV2H_DESC_SOURCE_TIMEOUT       6
 #define UV2H_DESC_DEST_PUT_ERR         7