linux-yocto/Documentation/core-api
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
boot-time-mm.rst
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
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
dma-api-howto.rst
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
generic-radix-tree.rst
genericirq.rst
gfp_mask-from-fs-io.rst
idr.rst
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
kref.rst
librs.rst
local_ops.rst
memory-allocation.rst
memory-hotplug.rst
mm-api.rst
packing.rst
padata.rst
pin_user_pages.rst
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
rbtree.rst
refcount-vs-atomic.rst
symbol-namespaces.rst
this_cpu_ops.rst
timekeeping.rst
tracepoint.rst
unaligned-memory-access.rst
workqueue.rst
xarray.rst