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authorJens Axboe <axboe@kernel.dk>2018-06-19 10:12:48 -0600
committerTejun Heo <tj@kernel.org>2018-06-19 09:30:27 -0700
commit6362f0a290023bafd7f991089e81dd9278f154b8 (patch)
tree428cf7f50aa99f374ad4eedf1e326dbd1fc118f4 /include/linux/libata.h
parent95ffcf471d05ec7c91993c91dea912f99dccfc26 (diff)
libata: add command iterator helpers
Now that we have the internal tag as a special (higher) value tag, it gets a bit tricky to iterate the internal commands as some loops will exceed ATA_MAX_QUEUE. Add explicit helpers for iterating pending commands, both inflight and internal. Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/libata.h')
-rw-r--r--include/linux/libata.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 8b8946dd63b9..a2257e380789 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1495,6 +1495,29 @@ static inline bool ata_tag_valid(unsigned int tag)
return tag < ATA_MAX_QUEUE || ata_tag_internal(tag);
}
+#define __ata_qc_for_each(ap, qc, tag, max_tag, fn) \
+ for ((tag) = 0; (tag) < (max_tag) && \
+ ({ qc = fn((ap), (tag)); 1; }); (tag)++) \
+
+/*
+ * Internal use only, iterate commands ignoring error handling and
+ * status of 'qc'.
+ */
+#define ata_qc_for_each_raw(ap, qc, tag) \
+ __ata_qc_for_each(ap, qc, tag, ATA_MAX_QUEUE, __ata_qc_from_tag)
+
+/*
+ * Iterate all potential commands that can be queued
+ */
+#define ata_qc_for_each(ap, qc, tag) \
+ __ata_qc_for_each(ap, qc, tag, ATA_MAX_QUEUE, ata_qc_from_tag)
+
+/*
+ * Like ata_qc_for_each, but with the internal tag included
+ */
+#define ata_qc_for_each_with_internal(ap, qc, tag) \
+ __ata_qc_for_each(ap, qc, tag, ATA_MAX_QUEUE + 1, ata_qc_from_tag)
+
/*
* device helpers
*/