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| author | Tejun Heo <htejun@gmail.com> | 2007-09-23 13:14:12 +0900 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-10-12 14:55:41 -0400 |
| commit | da917d69d0ea63f5390716cba6e77f490ce96df9 (patch) | |
| tree | 214670f42be4c140bbd05226adc8f86db51ee725 /include/linux/libata.h | |
| parent | 31cc23b34913bc173680bdc87af79e551bf8cc0d (diff) | |
| download | blackbird-op-linux-da917d69d0ea63f5390716cba6e77f490ce96df9.tar.gz blackbird-op-linux-da917d69d0ea63f5390716cba6e77f490ce96df9.zip | |
libata-pmp-prep: implement qc_defer helpers
Implement ap->nr_active_links (the number of links with active qcs),
ap->excl_link (pointer to link which can be used by ->qc_defer and is
cleared when a qc with ATA_QCFLAG_CLEAR_EXCL completes), and
ata_link_active().
These can be used by ->qc_defer() to implement proper command
exclusion. This set of helpers seem enough for both sil24 (ATAPI
exclusion needed) and cmd-switching PMP.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'include/linux/libata.h')
| -rw-r--r-- | include/linux/libata.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h index b0d4ca0d27b4..f9f81fd93293 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -216,6 +216,7 @@ enum { ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE, ATA_QCFLAG_IO = (1 << 3), /* standard IO command */ ATA_QCFLAG_RESULT_TF = (1 << 4), /* result TF requested */ + ATA_QCFLAG_CLEAR_EXCL = (1 << 5), /* clear excl_link on completion */ ATA_QCFLAG_FAILED = (1 << 16), /* cmd failed and is owned by EH */ ATA_QCFLAG_SENSE_VALID = (1 << 17), /* sense data valid */ @@ -579,11 +580,13 @@ struct ata_port { struct ata_queued_cmd qcmd[ATA_MAX_QUEUE]; unsigned long qc_allocated; unsigned int qc_active; + int nr_active_links; /* #links with active qcs */ struct ata_link link; /* host default link */ int nr_pmp_links; /* nr of available PMP links */ struct ata_link *pmp_link; /* array of PMP links */ + struct ata_link *excl_link; /* for PMP qc exclusion */ struct ata_port_stats stats; struct ata_host *host; @@ -1104,6 +1107,11 @@ static inline int ata_link_max_devices(const struct ata_link *link) return 1; } +static inline int ata_link_active(struct ata_link *link) +{ + return ata_tag_valid(link->active_tag) || link->sactive; +} + static inline struct ata_link *ata_port_first_link(struct ata_port *ap) { if (ap->nr_pmp_links) |
