libata: always use ata_qc_complete_multiple() for NCQ command completions

Currently, sata_fsl, mv and nv call ata_qc_complete() multiple times
from their interrupt handlers to indicate completion of NCQ commands.
This limits the visibility the libata core layer has into how commands
are being executed and completed, which is necessary to support IRQ
expecting in generic way.  libata already has an interface to complete
multiple commands at once - ata_qc_complete_multiple() which ahci and
sata_sil24 already use.

This patch updates the three drivers to use ata_qc_complete_multiple()
too and updates comments on ata_qc_complete[_multiple]() regarding
their usages with NCQ completions.  This change not only provides
better visibility into command execution to the core layer but also
simplifies low level drivers.

* sata_fsl: It already builds done_mask.  Conversion is straight
  forward.

* sata_mv: mv_process_crpb_response() no longer checks for illegal
  completions, it just returns whether the tag is completed or not.
  mv_process_crpb_entries() builds done_mask from it and passes it to
  ata_qc_complete_multiple() which will check for illegal completions.

* sata_nv adma: Similar to sata_mv.  nv_adma_check_cpb() now just
  returns the tag status and nv_adma_interrupt() builds done_mask from
  it and passes it to ata_qc_complete_multiple().

* sata_nv swncq: It already builds done_mask.  Drop unnecessary
  illegal transition checks and call ata_qc_complete_multiple().

In the long run, it might be a good idea to make ata_qc_complete()
whine if called when multiple NCQ commands are in flight.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ashish Kalra <ashish.kalra@freescale.com>
Cc: Saeed Bishara <saeed@marvell.com>
Cc: Mark Lord <liml@rtr.ca>
Cc: Robert Hancock <hancockr@shaw.ca>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 12 insertions, 13 deletions

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index a9fd970..bf74a36 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -2743,18 +2743,11 @@ static void mv_err_intr(struct ata_port *ap)
 	}
 }
 
-static void mv_process_crpb_response(struct ata_port *ap,
+static bool mv_process_crpb_response(struct ata_port *ap,
 		struct mv_crpb *response, unsigned int tag, int ncq_enabled)
 {
 	u8 ata_status;
 	u16 edma_status = le16_to_cpu(response->flags);
-	struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
-
-	if (unlikely(!qc)) {
-		ata_port_printk(ap, KERN_ERR, "%s: no qc for tag=%d\n",
-				__func__, tag);
-		return;
-	}
 
 	/*
 	 * edma_status from a response queue entry:
@@ -2768,13 +2761,14 @@ static void mv_process_crpb_response(struct ata_port *ap,
 			 * Error will be seen/handled by
 			 * mv_err_intr().  So do nothing at all here.
 			 */
-			return;
+			return false;
 		}
 	}
 	ata_status = edma_status >> CRPB_FLAG_STATUS_SHIFT;
 	if (!ac_err_mask(ata_status))
-		ata_qc_complete(qc);
+		return true;
 	/* else: leave it for mv_err_intr() */
+	return false;
 }
 
 static void mv_process_crpb_entries(struct ata_port *ap, struct mv_port_priv *pp)
@@ -2783,6 +2777,7 @@ static void mv_process_crpb_entries(struct ata_port *ap, struct mv_port_priv *pp
 	struct mv_host_priv *hpriv = ap->host->private_data;
 	u32 in_index;
 	bool work_done = false;
+	u32 done_mask = 0;
 	int ncq_enabled = (pp->pp_flags & MV_PP_FLAG_NCQ_EN);
 
 	/* Get the hardware queue position index */
@@ -2803,15 +2798,19 @@ static void mv_process_crpb_entries(struct ata_port *ap, struct mv_port_priv *pp
 			/* Gen II/IIE: get command tag from CRPB entry */
 			tag = le16_to_cpu(response->id) & 0x1f;
 		}
-		mv_process_crpb_response(ap, response, tag, ncq_enabled);
+		if (mv_process_crpb_response(ap, response, tag, ncq_enabled))
+			done_mask |= 1 << tag;
 		work_done = true;
 	}
 
-	/* Update the software queue position index in hardware */
-	if (work_done)
+	if (work_done) {
+		ata_qc_complete_multiple(ap, ap->qc_active ^ done_mask);
+
+		/* Update the software queue position index in hardware */
 		writelfl((pp->crpb_dma & EDMA_RSP_Q_BASE_LO_MASK) |
 			 (pp->resp_idx << EDMA_RSP_Q_PTR_SHIFT),
 			 port_mmio + EDMA_RSP_Q_OUT_PTR);
+	}
 }
 
 static void mv_port_intr(struct ata_port *ap, u32 port_cause)