1 files changed, 148 insertions, 41 deletions

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 954386a2b500..8f216de76648 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -55,7 +55,8 @@ static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
 
 static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
 static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
-static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
+static void ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
+static void ahci_qc_ncq_fill_rtf(struct ata_port *ap, u64 done_mask);
 static int ahci_port_start(struct ata_port *ap);
 static void ahci_port_stop(struct ata_port *ap);
 static enum ata_completion_errors ahci_qc_prep(struct ata_queued_cmd *qc);
@@ -157,6 +158,7 @@ struct ata_port_operations ahci_ops = {
 	.qc_prep		= ahci_qc_prep,
 	.qc_issue		= ahci_qc_issue,
 	.qc_fill_rtf		= ahci_qc_fill_rtf,
+	.qc_ncq_fill_rtf	= ahci_qc_ncq_fill_rtf,
 
 	.freeze			= ahci_freeze,
 	.thaw			= ahci_thaw,
@@ -1847,18 +1849,47 @@ static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
 		ata_port_abort(ap);
 }
 
-static void ahci_handle_port_interrupt(struct ata_port *ap,
-				       void __iomem *port_mmio, u32 status)
+static void ahci_qc_complete(struct ata_port *ap, void __iomem *port_mmio)
 {
 	struct ata_eh_info *ehi = &ap->link.eh_info;
 	struct ahci_port_priv *pp = ap->private_data;
-	struct ahci_host_priv *hpriv = ap->host->private_data;
-	int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
 	u32 qc_active = 0;
 	int rc;
 
+	/*
+	 * pp->active_link is not reliable once FBS is enabled, both
+	 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
+	 * NCQ and non-NCQ commands may be in flight at the same time.
+	 */
+	if (pp->fbs_enabled) {
+		if (ap->qc_active) {
+			qc_active = readl(port_mmio + PORT_SCR_ACT);
+			qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
+		}
+	} else {
+		/* pp->active_link is valid iff any command is in flight */
+		if (ap->qc_active && pp->active_link->sactive)
+			qc_active = readl(port_mmio + PORT_SCR_ACT);
+		else
+			qc_active = readl(port_mmio + PORT_CMD_ISSUE);
+	}
+
+	rc = ata_qc_complete_multiple(ap, qc_active);
+	if (unlikely(rc < 0 && !(ap->pflags & ATA_PFLAG_RESETTING))) {
+		ehi->err_mask |= AC_ERR_HSM;
+		ehi->action |= ATA_EH_RESET;
+		ata_port_freeze(ap);
+	}
+}
+
+static void ahci_handle_port_interrupt(struct ata_port *ap,
+				       void __iomem *port_mmio, u32 status)
+{
+	struct ahci_port_priv *pp = ap->private_data;
+	struct ahci_host_priv *hpriv = ap->host->private_data;
+
 	/* ignore BAD_PMP while resetting */
-	if (unlikely(resetting))
+	if (unlikely(ap->pflags & ATA_PFLAG_RESETTING))
 		status &= ~PORT_IRQ_BAD_PMP;
 
 	if (sata_lpm_ignore_phy_events(&ap->link)) {
@@ -1867,6 +1898,12 @@ static void ahci_handle_port_interrupt(struct ata_port *ap,
 	}
 
 	if (unlikely(status & PORT_IRQ_ERROR)) {
+		/*
+		 * Before getting the error notification, we may have
+		 * received SDB FISes notifying successful completions.
+		 * Handle these first and then handle the error.
+		 */
+		ahci_qc_complete(ap, port_mmio);
 		ahci_error_intr(ap, status);
 		return;
 	}
@@ -1903,32 +1940,8 @@ static void ahci_handle_port_interrupt(struct ata_port *ap,
 		}
 	}
 
-	/* pp->active_link is not reliable once FBS is enabled, both
-	 * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
-	 * NCQ and non-NCQ commands may be in flight at the same time.
-	 */
-	if (pp->fbs_enabled) {
-		if (ap->qc_active) {
-			qc_active = readl(port_mmio + PORT_SCR_ACT);
-			qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
-		}
-	} else {
-		/* pp->active_link is valid iff any command is in flight */
-		if (ap->qc_active && pp->active_link->sactive)
-			qc_active = readl(port_mmio + PORT_SCR_ACT);
-		else
-			qc_active = readl(port_mmio + PORT_CMD_ISSUE);
-	}
-
-
-	rc = ata_qc_complete_multiple(ap, qc_active);
-
-	/* while resetting, invalid completions are expected */
-	if (unlikely(rc < 0 && !resetting)) {
-		ehi->err_mask |= AC_ERR_HSM;
-		ehi->action |= ATA_EH_RESET;
-		ata_port_freeze(ap);
-	}
+	/* Handle completed commands */
+	ahci_qc_complete(ap, port_mmio);
 }
 
 static void ahci_port_intr(struct ata_port *ap)
@@ -2053,11 +2066,18 @@ unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
 }
 EXPORT_SYMBOL_GPL(ahci_qc_issue);
 
-static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
+static void ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
 {
 	struct ahci_port_priv *pp = qc->ap->private_data;
 	u8 *rx_fis = pp->rx_fis;
 
+	/*
+	 * rtf may already be filled (e.g. for successful NCQ commands).
+	 * If that is the case, we have nothing to do.
+	 */
+	if (qc->flags & ATA_QCFLAG_RTF_FILLED)
+		return;
+
 	if (pp->fbs_enabled)
 		rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
 
@@ -2068,13 +2088,100 @@ static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
 	 * Setup FIS.
 	 */
 	if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
-	    !(qc->flags & ATA_QCFLAG_FAILED)) {
+	    !(qc->flags & ATA_QCFLAG_EH)) {
 		ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
 		qc->result_tf.status = (rx_fis + RX_FIS_PIO_SETUP)[15];
-	} else
-		ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
+		qc->flags |= ATA_QCFLAG_RTF_FILLED;
+		return;
+	}
+
+	/*
+	 * For NCQ commands, we never get a D2H FIS, so reading the D2H Register
+	 * FIS area of the Received FIS Structure (which contains a copy of the
+	 * last D2H FIS received) will contain an outdated status code.
+	 * For NCQ commands, we instead get a SDB FIS, so read the SDB FIS area
+	 * instead. However, the SDB FIS does not contain the LBA, so we can't
+	 * use the ata_tf_from_fis() helper.
+	 */
+	if (ata_is_ncq(qc->tf.protocol)) {
+		const u8 *fis = rx_fis + RX_FIS_SDB;
+
+		/*
+		 * Successful NCQ commands have been filled already.
+		 * A failed NCQ command will read the status here.
+		 * (Note that a failed NCQ command will get a more specific
+		 * error when reading the NCQ Command Error log.)
+		 */
+		qc->result_tf.status = fis[2];
+		qc->result_tf.error = fis[3];
+		qc->flags |= ATA_QCFLAG_RTF_FILLED;
+		return;
+	}
 
-	return true;
+	ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
+	qc->flags |= ATA_QCFLAG_RTF_FILLED;
+}
+
+static void ahci_qc_ncq_fill_rtf(struct ata_port *ap, u64 done_mask)
+{
+	struct ahci_port_priv *pp = ap->private_data;
+	const u8 *fis;
+
+	/* No outstanding commands. */
+	if (!ap->qc_active)
+		return;
+
+	/*
+	 * FBS not enabled, so read status and error once, since they are shared
+	 * for all QCs.
+	 */
+	if (!pp->fbs_enabled) {
+		u8 status, error;
+
+		/* No outstanding NCQ commands. */
+		if (!pp->active_link->sactive)
+			return;
+
+		fis = pp->rx_fis + RX_FIS_SDB;
+		status = fis[2];
+		error = fis[3];
+
+		while (done_mask) {
+			struct ata_queued_cmd *qc;
+			unsigned int tag = __ffs64(done_mask);
+
+			qc = ata_qc_from_tag(ap, tag);
+			if (qc && ata_is_ncq(qc->tf.protocol)) {
+				qc->result_tf.status = status;
+				qc->result_tf.error = error;
+				qc->flags |= ATA_QCFLAG_RTF_FILLED;
+			}
+			done_mask &= ~(1ULL << tag);
+		}
+
+		return;
+	}
+
+	/*
+	 * FBS enabled, so read the status and error for each QC, since the QCs
+	 * can belong to different PMP links. (Each PMP link has its own FIS
+	 * Receive Area.)
+	 */
+	while (done_mask) {
+		struct ata_queued_cmd *qc;
+		unsigned int tag = __ffs64(done_mask);
+
+		qc = ata_qc_from_tag(ap, tag);
+		if (qc && ata_is_ncq(qc->tf.protocol)) {
+			fis = pp->rx_fis;
+			fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
+			fis += RX_FIS_SDB;
+			qc->result_tf.status = fis[2];
+			qc->result_tf.error = fis[3];
+			qc->flags |= ATA_QCFLAG_RTF_FILLED;
+		}
+		done_mask &= ~(1ULL << tag);
+	}
 }
 
 static void ahci_freeze(struct ata_port *ap)
@@ -2106,7 +2213,7 @@ void ahci_error_handler(struct ata_port *ap)
 {
 	struct ahci_host_priv *hpriv = ap->host->private_data;
 
-	if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
+	if (!ata_port_is_frozen(ap)) {
 		/* restart engine */
 		hpriv->stop_engine(ap);
 		hpriv->start_engine(ap);
@@ -2124,7 +2231,7 @@ static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
 	struct ata_port *ap = qc->ap;
 
 	/* make DMA engine forget about the failed command */
-	if (qc->flags & ATA_QCFLAG_FAILED)
+	if (qc->flags & ATA_QCFLAG_EH)
 		ahci_kick_engine(ap);
 }
 
@@ -2297,7 +2404,7 @@ static void ahci_pmp_attach(struct ata_port *ap)
 	 * Note that during initialization, the port is marked as
 	 * frozen since the irq handler is not yet registered.
 	 */
-	if (!(ap->pflags & ATA_PFLAG_FROZEN))
+	if (!ata_port_is_frozen(ap))
 		writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
 }
 
@@ -2316,7 +2423,7 @@ static void ahci_pmp_detach(struct ata_port *ap)
 	pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
 
 	/* see comment above in ahci_pmp_attach() */
-	if (!(ap->pflags & ATA_PFLAG_FROZEN))
+	if (!ata_port_is_frozen(ap))
 		writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
 }