IB/ipath: add calls to new 7220 code and enable in build

This patch adds the initialization calls into the new 7220 HCA files,
changes the Makefile to compile and link the new files, and code to
handle send DMA.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 69 insertions, 22 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_sdma.c b/drivers/infiniband/hw/ipath/ipath_sdma.c
index 5918cafb880b..1974df7a9f78 100644
--- a/drivers/infiniband/hw/ipath/ipath_sdma.c
+++ b/drivers/infiniband/hw/ipath/ipath_sdma.c
@@ -230,7 +230,6 @@ static void dump_sdma_state(struct ipath_devdata *dd)
 static void sdma_abort_task(unsigned long opaque)
 {
 	struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
-	int kick = 0;
 	u64 status;
 	unsigned long flags;
 
@@ -308,30 +307,26 @@ static void sdma_abort_task(unsigned long opaque)
 		/* done with sdma state for a bit */
 		spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
 
-		/* restart sdma engine */
+		/*
+		 * Don't restart sdma here. Wait until link is up to ACTIVE.
+		 * VL15 MADs used to bring the link up use PIO, and multiple
+		 * link transitions otherwise cause the sdma engine to be
+		 * stopped and started multiple times.
+		 * The disable is done here, including the shadow, so the
+		 * state is kept consistent.
+		 * See ipath_restart_sdma() for the actual starting of sdma.
+		 */
 		spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
 		dd->ipath_sendctrl &= ~INFINIPATH_S_SDMAENABLE;
 		ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
 				 dd->ipath_sendctrl);
 		ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
-		dd->ipath_sendctrl |= INFINIPATH_S_SDMAENABLE;
-		ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
-				 dd->ipath_sendctrl);
-		ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 		spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
-		kick = 1;
-		ipath_dbg("sdma restarted from abort\n");
-
-		/* now clear status bits */
-		spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
-		__clear_bit(IPATH_SDMA_ABORTING, &dd->ipath_sdma_status);
-		__clear_bit(IPATH_SDMA_DISARMED, &dd->ipath_sdma_status);
-		__clear_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
 
 		/* make sure I see next message */
 		dd->ipath_sdma_abort_jiffies = 0;
 
-		goto unlock;
+		goto done;
 	}
 
 resched:
@@ -353,10 +348,8 @@ resched_noprint:
 
 unlock:
 	spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
-
-	/* kick upper layers */
-	if (kick)
-		ipath_ib_piobufavail(dd->verbs_dev);
+done:
+	return;
 }
 
 /*
@@ -481,10 +474,14 @@ int setup_sdma(struct ipath_devdata *dd)
 	tasklet_init(&dd->ipath_sdma_abort_task, sdma_abort_task,
 		     (unsigned long) dd);
 
-	/* Turn on SDMA */
+	/*
+	 * No use to turn on SDMA here, as link is probably not ACTIVE
+	 * Just mark it RUNNING and enable the interrupt, and let the
+	 * ipath_restart_sdma() on link transition to ACTIVE actually
+	 * enable it.
+	 */
 	spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
-	dd->ipath_sendctrl |= INFINIPATH_S_SDMAENABLE |
-		INFINIPATH_S_SDMAINTENABLE;
+	dd->ipath_sendctrl |= INFINIPATH_S_SDMAINTENABLE;
 	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl);
 	ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 	__set_bit(IPATH_SDMA_RUNNING, &dd->ipath_sdma_status);
@@ -572,6 +569,56 @@ void teardown_sdma(struct ipath_devdata *dd)
 				  sdma_descq, sdma_descq_phys);
 }
 
+/*
+ * [Re]start SDMA, if we use it, and it's not already OK.
+ * This is called on transition to link ACTIVE, either the first or
+ * subsequent times.
+ */
+void ipath_restart_sdma(struct ipath_devdata *dd)
+{
+	unsigned long flags;
+	int needed = 1;
+
+	if (!(dd->ipath_flags & IPATH_HAS_SEND_DMA))
+		goto bail;
+
+	/*
+	 * First, make sure we should, which is to say,
+	 * check that we are "RUNNING" (not in teardown)
+	 * and not "SHUTDOWN"
+	 */
+	spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
+	if (!test_bit(IPATH_SDMA_RUNNING, &dd->ipath_sdma_status)
+		|| test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
+			needed = 0;
+	else {
+		__clear_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
+		__clear_bit(IPATH_SDMA_DISARMED, &dd->ipath_sdma_status);
+		__clear_bit(IPATH_SDMA_ABORTING, &dd->ipath_sdma_status);
+	}
+	spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
+	if (!needed) {
+		ipath_dbg("invalid attempt to restart SDMA, status 0x%016llx\n",
+			dd->ipath_sdma_status);
+		goto bail;
+	}
+	spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
+	/*
+	 * First clear, just to be safe. Enable is only done
+	 * in chip on 0->1 transition
+	 */
+	dd->ipath_sendctrl &= ~INFINIPATH_S_SDMAENABLE;
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl);
+	ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
+	dd->ipath_sendctrl |= INFINIPATH_S_SDMAENABLE;
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl);
+	ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
+	spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
+
+bail:
+	return;
+}
+
 static inline void make_sdma_desc(struct ipath_devdata *dd,
 	u64 *sdmadesc, u64 addr, u64 dwlen, u64 dwoffset)
 {