From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/include/scsi/scsi_tcq.h | 101 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 kernel/include/scsi/scsi_tcq.h (limited to 'kernel/include/scsi/scsi_tcq.h') diff --git a/kernel/include/scsi/scsi_tcq.h b/kernel/include/scsi/scsi_tcq.h new file mode 100644 index 000000000..b27977e8a --- /dev/null +++ b/kernel/include/scsi/scsi_tcq.h @@ -0,0 +1,101 @@ +#ifndef _SCSI_SCSI_TCQ_H +#define _SCSI_SCSI_TCQ_H + +#include +#include +#include +#include + +#define SCSI_NO_TAG (-1) /* identify no tag in use */ + + +#ifdef CONFIG_BLOCK +static inline struct scsi_cmnd *scsi_mq_find_tag(struct Scsi_Host *shost, + int unique_tag) +{ + u16 hwq = blk_mq_unique_tag_to_hwq(unique_tag); + struct request *req = NULL; + + if (hwq < shost->tag_set.nr_hw_queues) + req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq], + blk_mq_unique_tag_to_tag(unique_tag)); + return req ? (struct scsi_cmnd *)req->special : NULL; +} + +/** + * scsi_find_tag - find a tagged command by device + * @SDpnt: pointer to the ScSI device + * @tag: tag generated by blk_mq_unique_tag() + * + * Notes: + * Only works with tags allocated by the generic blk layer. + **/ +static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag) +{ + struct request *req; + + if (tag != SCSI_NO_TAG) { + if (shost_use_blk_mq(sdev->host)) + return scsi_mq_find_tag(sdev->host, tag); + + req = blk_queue_find_tag(sdev->request_queue, tag); + return req ? (struct scsi_cmnd *)req->special : NULL; + } + + /* single command, look in space */ + return sdev->current_cmnd; +} + + +/** + * scsi_init_shared_tag_map - create a shared tag map + * @shost: the host to share the tag map among all devices + * @depth: the total depth of the map + */ +static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth) +{ + /* + * We always have a shared tag map around when using blk-mq. + */ + if (shost_use_blk_mq(shost)) + return 0; + + /* + * If the shared tag map isn't already initialized, do it now. + * This saves callers from having to check ->bqt when setting up + * devices on the shared host (for libata) + */ + if (!shost->bqt) { + shost->bqt = blk_init_tags(depth, + shost->hostt->tag_alloc_policy); + if (!shost->bqt) + return -ENOMEM; + } + + return 0; +} + +/** + * scsi_host_find_tag - find the tagged command by host + * @shost: pointer to scsi_host + * @tag: tag generated by blk_mq_unique_tag() + * + * Notes: + * Only works with tags allocated by the generic blk layer. + **/ +static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, + int tag) +{ + struct request *req; + + if (tag != SCSI_NO_TAG) { + if (shost_use_blk_mq(shost)) + return scsi_mq_find_tag(shost, tag); + req = blk_map_queue_find_tag(shost->bqt, tag); + return req ? (struct scsi_cmnd *)req->special : NULL; + } + return NULL; +} + +#endif /* CONFIG_BLOCK */ +#endif /* _SCSI_SCSI_TCQ_H */ -- cgit 1.2.3-korg