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blk-mq: allow software queue to map to multiple hardware queues

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The mapping used to be dependent on just the CPU location, but
now it's a tuple of (type, cpu) instead. This is a prep patch
for allowing a single software queue to map to multiple hardware
queues. No functional changes in this patch.

This changes the software queue count to an unsigned short
to save a bit of space. We can still support 64K-1 CPUs,
which should be enough. Add a check to catch a wrap.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-10-29 13:13:29 -06:00
parent f9afca4d36
commit f31967f0e4
5 changed files with 23 additions and 12 deletions
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3
include/linux/blk-mq.h
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@ -37,7 +37,8 @@ struct blk_mq_hw_ctx {
struct blk_mq_ctx *dispatch_from;
unsigned int dispatch_busy;
unsigned int nr_ctx;
unsigned short type;
unsigned short nr_ctx;
struct blk_mq_ctx **ctxs;
spinlock_t dispatch_wait_lock;