[PATCH] libata-ncq: implement ap->qc_active, ap->sactive and complete helper

Add ap->qc_active and ap->sactive, mask of all active qcs and libata's
view of the SActive register, respectively.  Also, implement
ata_qc_complete_multiple() which takes new qc_active mask and complete
multiple qcs according to the mask.

These will be used to track NCQ commands and complete them.  The
distinction between ap->qc_active and ap->sactive is also useful for
later PM implementation.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index b3a4f8bea828..dd0db2d21bc5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -475,7 +475,10 @@ struct ata_port {
 
         struct ata_queued_cmd   qcmd[ATA_MAX_QUEUE];
         unsigned long           qc_allocated;
+        unsigned int            qc_active;
+
         unsigned int            active_tag;
+        u32                     sactive;
 
         struct ata_host_stats   stats;
         struct ata_host_set     *host_set;
@@ -668,6 +671,8 @@ extern void ata_bmdma_drive_eh(struct ata_port *ap,
 extern void ata_bmdma_error_handler(struct ata_port *ap);
 extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
 extern void ata_qc_complete(struct ata_queued_cmd *qc);
+extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
+                                    void (*finish_qc)(struct ata_queued_cmd *));
 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
                               void (*done)(struct scsi_cmnd *));
 extern int ata_std_bios_param(struct scsi_device *sdev,