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authorChristoph Hellwig <hch@lst.de>2018-12-07 00:39:32 +0300
committerChristoph Hellwig <hch@lst.de>2018-12-13 23:06:18 +0300
commit356da6d0cde3323236977fce54c1f9612a742036 (patch)
tree87ad8176833266fbaa038780d67aebcc490d0d64 /arch/ia64
parent190d4e5916a2d70a11009022b968fca948fb5dc7 (diff)
downloadlinux-356da6d0cde3323236977fce54c1f9612a742036.tar.xz
dma-mapping: bypass indirect calls for dma-direct
Avoid expensive indirect calls in the fast path DMA mapping operations by directly calling the dma_direct_* ops if we are using the directly mapped DMA operations. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/hp/common/hwsw_iommu.c2
-rw-r--r--arch/ia64/hp/common/sba_iommu.c4
-rw-r--r--arch/ia64/kernel/dma-mapping.c1
3 files changed, 3 insertions, 4 deletions
diff --git a/arch/ia64/hp/common/hwsw_iommu.c b/arch/ia64/hp/common/hwsw_iommu.c
index f40ca499b246..8840ed97712f 100644
--- a/arch/ia64/hp/common/hwsw_iommu.c
+++ b/arch/ia64/hp/common/hwsw_iommu.c
@@ -38,7 +38,7 @@ static inline int use_swiotlb(struct device *dev)
const struct dma_map_ops *hwsw_dma_get_ops(struct device *dev)
{
if (use_swiotlb(dev))
- return &dma_direct_ops;
+ return NULL;
return &sba_dma_ops;
}
EXPORT_SYMBOL(hwsw_dma_get_ops);
diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 5ee74820a0f6..5a361e51cb1e 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -2078,7 +2078,7 @@ sba_init(void)
* a successful kdump kernel boot is to use the swiotlb.
*/
if (is_kdump_kernel()) {
- dma_ops = &dma_direct_ops;
+ dma_ops = NULL;
if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
panic("Unable to initialize software I/O TLB:"
" Try machvec=dig boot option");
@@ -2100,7 +2100,7 @@ sba_init(void)
* If we didn't find something sba_iommu can claim, we
* need to setup the swiotlb and switch to the dig machvec.
*/
- dma_ops = &dma_direct_ops;
+ dma_ops = NULL;
if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
panic("Unable to find SBA IOMMU or initialize "
"software I/O TLB: Try machvec=dig boot option");
diff --git a/arch/ia64/kernel/dma-mapping.c b/arch/ia64/kernel/dma-mapping.c
index 80cd3e1ea95a..ad7d9963de34 100644
--- a/arch/ia64/kernel/dma-mapping.c
+++ b/arch/ia64/kernel/dma-mapping.c
@@ -36,7 +36,6 @@ long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
void __init swiotlb_dma_init(void)
{
- dma_ops = &dma_direct_ops;
swiotlb_init(1);
}
#endif