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Christoph Hellwig 858299dc61 block: add scatterlist-less DMA mapping helpers 
Add a new blk_rq_dma_map / blk_rq_dma_unmap pair that does away with
the wasteful scatterlist structure.  Instead it uses the mapping iterator
to either add segments to the IOVA for IOMMU operations, or just maps
them one by one for the direct mapping.  For the IOMMU case instead of
a scatterlist with an entry for each segment, only a single [dma_addr,len]
pair needs to be stored for processing a request, and for the direct
mapping the per-segment allocation shrinks from
[page,offset,len,dma_addr,dma_len] to just [dma_addr,len].

One big difference to the scatterlist API, which could be considered
downside, is that the IOVA collapsing only works when the driver sets
a virt_boundary that matches the IOMMU granule.  For NVMe this is done
already so it works perfectly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20250625113531.522027-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2025-06-30 15:50:32 -06:00
..
partitions for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
Kconfig block: Remove obsolete configs BLK_MQ_{PCI,VIRTIO} 2025-05-14 05:43:56 -06:00
Kconfig.iosched
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Makefile blk-mq: move the DMA mapping code to a separate file 2025-05-16 08:43:41 -06:00
badblocks.c badblocks: Fix a nonsense WARN_ON() which checks whether a u64 variable < 0 2025-03-10 07:41:58 -06:00
bdev.c xfs: New code for 6.16 2025-05-26 12:56:01 -07:00
bfq-cgroup.c Revert "block, bfq: merge bfq_release_process_ref() into bfq_put_cooperator()" 2024-11-19 19:05:32 -07:00
bfq-iosched.c block: move wbt_enable_default() out of queue freezing from sched ->exit() 2025-05-06 07:43:43 -06:00
bfq-iosched.h block, bfq: remove bfq_log_bfqg() 2024-09-10 16:32:09 -06:00
bfq-wf2q.c
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bio-integrity-auto.c block: always allocate integrity buffer when required 2025-05-12 07:14:03 -06:00
bio-integrity.c block: don't merge different kinds of P2P transfers in a single bio 2025-06-30 15:50:32 -06:00
bio.c block: don't merge different kinds of P2P transfers in a single bio 2025-06-30 15:50:32 -06:00
blk-cgroup-fc-appid.c
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blk-cgroup-rwstat.c blk-cgroup: use group allocation/free of per-cpu counters API 2024-04-03 09:10:17 -06:00
blk-cgroup-rwstat.h blk-cgroup: rwstat: fix kernel-doc warnings in header file 2025-01-13 07:47:09 -07:00
blk-cgroup.c cgroup: Changes for v6.16 2025-05-27 20:59:53 -07:00
blk-cgroup.h block: correct locking order for protecting blk-wbt parameters 2025-03-19 11:35:45 -06:00
blk-core.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-crypto-fallback.c block: add a bi_write_stream field 2025-05-06 07:46:43 -06:00
blk-crypto-internal.h blk-crypto: add ioctls to create and prepare hardware-wrapped keys 2025-02-10 09:54:19 -07:00
blk-crypto-profile.c blk-crypto: export wrapped key functions 2025-05-06 19:08:08 +02:00
blk-crypto-sysfs.c blk-crypto: show supported key types in sysfs 2025-02-10 09:54:19 -07:00
blk-crypto.c blk-crypto: add ioctls to create and prepare hardware-wrapped keys 2025-02-10 09:54:19 -07:00
blk-flush.c block: remove unused parameter 2025-03-12 08:25:28 -06:00
blk-ia-ranges.c block: get rid of request queue ->sysfs_dir_lock 2025-01-29 07:16:47 -07:00
blk-integrity.c block: flip iter directions in blk_rq_integrity_map_user() 2025-06-03 17:24:59 -06:00
blk-ioc.c block: replace call_rcu by kfree_rcu for simple kmem_cache_free callback 2024-10-22 08:16:40 -06:00
blk-iocost.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
blk-iolatency.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-ioprio.c blk-cgroup: Simplify policy files registration 2025-03-11 09:22:55 -10:00
blk-ioprio.h blk-ioprio: remove per-disk structure 2024-07-28 16:47:51 -06:00
blk-lib.c block: fix detection of unsupported WRITE SAME in blkdev_issue_write_zeroes 2024-08-28 08:49:25 -06:00
blk-map.c block: simplify bio_map_kern 2025-05-07 07:31:07 -06:00
blk-merge.c block: use plug request list tail for one-shot backmerge attempt 2025-06-11 08:48:46 -06:00
blk-mq-cpumap.c blk-mq: create correct map for fallback case 2025-01-23 06:34:32 -07:00
blk-mq-debugfs.c block: add new helper for disabling elevator switch when deleting disk 2025-05-06 07:43:43 -06:00
blk-mq-debugfs.h block: Replace zone_wlock debugfs entry with zone_wplugs entry 2024-04-17 08:44:03 -06:00
blk-mq-dma.c block: add scatterlist-less DMA mapping helpers 2025-06-30 15:50:32 -06:00
blk-mq-sched.c block: fail to show/store elevator sysfs attribute if elevator is dying 2025-05-06 07:43:43 -06:00
blk-mq-sched.h
…
blk-mq-sysfs.c block: protect hctx attributes/params using q->elevator_lock 2025-03-10 07:31:06 -06:00
blk-mq-tag.c block: remove unused parameter 2025-03-12 08:25:28 -06:00
blk-mq.c block: Introduce bio_needs_zone_write_plugging() 2025-06-30 15:50:31 -06:00
blk-mq.h block: clean up blk_mq_in_flight_rw() 2025-05-10 16:11:21 +08:00
blk-pm.c block: force noio scope in blk_mq_freeze_queue 2025-01-31 07:20:08 -07:00
blk-pm.h
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blk-rq-qos.c block: blk-rq-qos: guard rq-qos helpers by static key 2025-04-21 05:07:03 -06:00
blk-rq-qos.h block: blk-rq-qos: guard rq-qos helpers by static key 2025-04-21 05:07:03 -06:00
blk-settings.c block: remove bounce buffering support 2025-05-05 13:22:39 -06:00
blk-stat.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-stat.h treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
blk-sysfs.c block: move removing elevator after deleting disk->queue_kobj 2025-05-08 09:03:44 -06:00
blk-throttle.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-throttle.h blk-throttle: Prevents the bps restricted io from entering the bps queue again 2025-05-13 12:08:27 -06:00
blk-timeout.c
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blk-wbt.c for-6.16/block-20250523 2025-05-26 11:39:36 -07:00
blk-wbt.h
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blk-zoned.c block: Introduce bio_needs_zone_write_plugging() 2025-06-30 15:50:31 -06:00
blk.h block: Increase BLK_DEF_MAX_SECTORS_CAP 2025-06-30 15:50:31 -06:00
bsg-lib.c block: remove unused parameter 'q' parameter in __blk_rq_map_sg() 2025-03-13 05:46:19 -06:00
bsg.c
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disk-events.c
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early-lookup.c wrapper for access to ->bd_partno 2024-05-02 17:48:09 -04:00
elevator.c block: fix elv_update_nr_hw_queues() to reattach elevator 2025-05-15 12:14:18 -06:00
elevator.h block: move wbt_enable_default() out of queue freezing from sched ->exit() 2025-05-06 07:43:43 -06:00
fops.c block: expose write streams for block device nodes 2025-05-06 07:46:43 -06:00
genhd.c block: fix false warning in bdev_count_inflight_rw() 2025-06-26 07:34:11 -06:00
holder.c block: fix deadlock between bd_link_disk_holder and partition scan 2024-02-23 07:44:19 -07:00
ioctl.c block: fix race between set_blocksize and read paths 2025-04-23 13:58:06 -06:00
ioprio.c block: remove test of incorrect io priority level 2025-05-08 09:04:12 -06:00
kyber-iosched.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
mq-deadline.c block: take rq_list instead of plug in dispatch functions 2025-05-02 09:21:08 -06:00
opal_proto.h block: sed-opal: handle empty atoms when parsing response 2024-02-16 15:52:45 -07:00
sed-opal.c block: sed-opal: add ioctl IOC_OPAL_SET_SID_PW 2024-10-22 08:16:40 -06:00
t10-pi.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00