diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-19 23:27:23 +0300 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-19 23:27:23 +0300 |
commit | 671df189537883f36cf9c7d4f9495bfac0f86627 (patch) | |
tree | 22e5f598ed1f5d9b2218d85d4426140f804d61e6 /block | |
parent | c9fe5630dae1df2328d82042602e2c4d1add8d57 (diff) | |
parent | c7d9eccb3c1e802c5cbb2a764eb0eb9807d9f12e (diff) | |
download | linux-671df189537883f36cf9c7d4f9495bfac0f86627.tar.xz |
Merge tag 'dma-mapping-5.4' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping updates from Christoph Hellwig:
- add dma-mapping and block layer helpers to take care of IOMMU merging
for mmc plus subsequent fixups (Yoshihiro Shimoda)
- rework handling of the pgprot bits for remapping (me)
- take care of the dma direct infrastructure for swiotlb-xen (me)
- improve the dma noncoherent remapping infrastructure (me)
- better defaults for ->mmap, ->get_sgtable and ->get_required_mask
(me)
- cleanup mmaping of coherent DMA allocations (me)
- various misc cleanups (Andy Shevchenko, me)
* tag 'dma-mapping-5.4' of git://git.infradead.org/users/hch/dma-mapping: (41 commits)
mmc: renesas_sdhi_internal_dmac: Add MMC_CAP2_MERGE_CAPABLE
mmc: queue: Fix bigger segments usage
arm64: use asm-generic/dma-mapping.h
swiotlb-xen: merge xen_unmap_single into xen_swiotlb_unmap_page
swiotlb-xen: simplify cache maintainance
swiotlb-xen: use the same foreign page check everywhere
swiotlb-xen: remove xen_swiotlb_dma_mmap and xen_swiotlb_dma_get_sgtable
xen: remove the exports for xen_{create,destroy}_contiguous_region
xen/arm: remove xen_dma_ops
xen/arm: simplify dma_cache_maint
xen/arm: use dev_is_dma_coherent
xen/arm: consolidate page-coherent.h
xen/arm: use dma-noncoherent.h calls for xen-swiotlb cache maintainance
arm: remove wrappers for the generic dma remap helpers
dma-mapping: introduce a dma_common_find_pages helper
dma-mapping: always use VM_DMA_COHERENT for generic DMA remap
vmalloc: lift the arm flag for coherent mappings to common code
dma-mapping: provide a better default ->get_required_mask
dma-mapping: remove the dma_declare_coherent_memory export
remoteproc: don't allow modular build
...
Diffstat (limited to 'block')
-rw-r--r-- | block/blk-settings.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 6bd1e3b082d8..5f6dcc7a47bd 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -12,6 +12,7 @@ #include <linux/lcm.h> #include <linux/jiffies.h> #include <linux/gfp.h> +#include <linux/dma-mapping.h> #include "blk.h" #include "blk-wbt.h" @@ -848,6 +849,28 @@ void blk_queue_required_elevator_features(struct request_queue *q, } EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features); +/** + * blk_queue_can_use_dma_map_merging - configure queue for merging segments. + * @q: the request queue for the device + * @dev: the device pointer for dma + * + * Tell the block layer about merging the segments by dma map of @q. + */ +bool blk_queue_can_use_dma_map_merging(struct request_queue *q, + struct device *dev) +{ + unsigned long boundary = dma_get_merge_boundary(dev); + + if (!boundary) + return false; + + /* No need to update max_segment_size. see blk_queue_virt_boundary() */ + blk_queue_virt_boundary(q, boundary); + + return true; +} +EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging); + static int __init blk_settings_init(void) { blk_max_low_pfn = max_low_pfn - 1; |