John Garry f3e7d9471c dma-mapping: add dma_opt_mapping_size() ... [ Upstream commit a229cc14f3 ] Streaming DMA mapping involving an IOMMU may be much slower for larger total mapping size. This is because every IOMMU DMA mapping requires an IOVA to be allocated and freed. IOVA sizes above a certain limit are not cached, which can have a big impact on DMA mapping performance. Provide an API for device drivers to know this "optimal" limit, such that they may try to produce mapping which don't exceed it. Signed-off-by: John Garry <john.garry@huawei.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Stable-dep-of: afc5aa46ed ("iommu/dma: Force swiotlb_max_mapping_size on an untrusted device") Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-04-10 16:18:47 +02:00
..
irq	Documentation: Fix irq-domain.rst build warning	2021-09-03 09:54:15 +01:00
assoc_array.rst	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
boot-time-mm.rst	docs/boot-time-mm: remove bootmem documentation	2018-10-31 08:54:16 -07:00
bus-virt-phys-mapping.rst	docs: core-api: avoid using ReST :doc:foo markup	2021-06-17 13:24:37 -06:00
cachetlb.rst	mm: remove flush_kernel_dcache_page	2021-09-03 09:58:13 -07:00
circular-buffers.rst	doc: Remove ".vnet" from paulmck email addresses	2019-05-28 09:02:57 -07:00
cpu_hotplug.rst	Documentation: core-api/cpuhotplug: Rewrite the API section	2021-09-11 00:41:21 +02:00
debug-objects.rst
debugging-via-ohci1394.rst	docs: debugging-via-ohci1394.txt: add it to the core-api book	2020-05-15 11:59:17 -06:00
dma-api-howto.rst	docs: move DMA kAPI to Documentation/core-api	2020-05-15 11:51:54 -06:00
dma-api.rst	dma-mapping: add dma_opt_mapping_size()	2024-04-10 16:18:47 +02:00
dma-attributes.rst	Reinstate some of "swiotlb: rework "fix info leak with DMA_FROM_DEVICE""	2022-04-08 14:24:13 +02:00
dma-isa-lpc.rst	docs: core-api: avoid using ReST :doc:foo markup	2021-06-17 13:24:37 -06:00
errseq.rst
genalloc.rst	lib/genalloc.c: rename addr_in_gen_pool to gen_pool_has_addr	2019-12-04 19:44:13 -08:00
generic-radix-tree.rst	generic radix trees	2019-03-12 10:04:02 -07:00
genericirq.rst	docs: genericirq.rst: don't document chip.c functions twice	2020-10-15 07:49:41 +02:00
gfp_mask-from-fs-io.rst	docs: core-api/gfp_mask-from-fs-io: add a label for cross-referencing	2018-09-20 11:02:32 -06:00
idr.rst	Core-api: Documentation: Replace deprecated :c:func: Usage	2020-08-11 10:26:08 -06:00
index.rst	docs: core-api: avoid using ReST :doc:foo markup	2021-06-17 13:24:37 -06:00
kernel-api.rst	block: move fs/block_dev.c to block/bdev.c	2021-09-07 08:39:40 -06:00
kobject.rst	kobject: documentation: Replace HTTP links with HTTPS ones	2020-07-13 09:30:41 -06:00
kref.rst	docs: move the kref doc into the core-api book	2020-05-15 12:02:19 -06:00
librs.rst
local_ops.rst
memory-allocation.rst	mm: slab: provide krealloc_array()	2020-12-15 12:13:37 -08:00
memory-hotplug.rst	docs/core-api: memory-hotplug: add some details about locking internals	2018-10-12 11:14:19 -06:00
mm-api.rst	mm/mmzone.h: fix existing kernel-doc comments and link them to core-api	2021-04-30 11:20:43 -07:00
packing.rst	docs: packing: move it to core-api book and adjust markups	2019-07-31 13:30:01 -06:00
padata.rst	padata: fold padata_alloc_possible() into padata_alloc()	2020-07-23 17:34:18 +10:00
pin_user_pages.rst	selftests/vm: only some gup_test items are really benchmarks	2020-12-15 12:13:38 -08:00
printk-basics.rst	printk: Move the printk() kerneldoc comment to its new home	2021-07-26 12:36:44 +02:00
printk-formats.rst	docs: printk-formats: fix build warning	2021-07-25 14:34:32 -06:00
protection-keys.rst	x86/Kconfig: Update config and kernel doc for MPK feature on AMD	2020-05-28 18:27:40 +02:00
rbtree.rst	docs: rbtree.rst: Fix a typo	2021-03-25 11:38:51 -06:00
refcount-vs-atomic.rst	docs: remove :c:func: from refcount-vs-atomic.rst	2019-10-07 09:08:56 -06:00
symbol-namespaces.rst	docs/core-api: Consistent code style	2021-05-03 16:52:50 -06:00
this_cpu_ops.rst	docs: move other kAPI documents to core-api	2020-06-26 11:33:42 -06:00
timekeeping.rst	docs: timekeeping: Use correct prototype for deprecated functions	2020-04-15 14:48:26 -06:00
tracepoint.rst
unaligned-memory-access.rst	docs: move other kAPI documents to core-api	2020-06-26 11:33:42 -06:00
workqueue.rst	docs: basics.rst: move kernel-doc workqueue markups to workqueue.rst	2020-10-15 07:49:41 +02:00
xarray.rst	XArray: add xas_split	2020-10-16 11:11:15 -07:00