diff options
| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2019-08-29 11:52:50 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 02:40:14 +0300 |
| commit | 650ab1e370cdb61ba5c7495006f4376e02374da0 (patch) | |
| tree | 99f4db55e278275d846cf9bff710114248ee9b81 /drivers/vfio | |
| parent | 01b7d128b5a7f0d09626c090093ff44155f347c9 (diff) | |
| download | linux-650ab1e370cdb61ba5c7495006f4376e02374da0.tar.xz | |
vfio/spapr_tce: Invalidate multiple TCEs at once
Invalidating a TCE cache entry for each updated TCE is quite expensive.
This makes use of the new iommu_table_ops::xchg_no_kill()/tce_kill()
callbacks to bring down the time spent in mapping a huge guest DMA window.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190829085252.72370-4-aik@ozlabs.ru
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio_iommu_spapr_tce.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c index 8ce9ad21129f..9809369e0ed3 100644 --- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -435,7 +435,7 @@ static int tce_iommu_clear(struct tce_container *container, unsigned long oldhpa; long ret; enum dma_data_direction direction; - unsigned long lastentry = entry + pages; + unsigned long lastentry = entry + pages, firstentry = entry; for ( ; entry < lastentry; ++entry) { if (tbl->it_indirect_levels && tbl->it_userspace) { @@ -460,7 +460,7 @@ static int tce_iommu_clear(struct tce_container *container, direction = DMA_NONE; oldhpa = 0; - ret = iommu_tce_xchg(container->mm, tbl, entry, &oldhpa, + ret = iommu_tce_xchg_no_kill(container->mm, tbl, entry, &oldhpa, &direction); if (ret) continue; @@ -476,6 +476,8 @@ static int tce_iommu_clear(struct tce_container *container, tce_iommu_unuse_page(container, oldhpa); } + iommu_tce_kill(tbl, firstentry, pages); + return 0; } @@ -518,8 +520,8 @@ static long tce_iommu_build(struct tce_container *container, hpa |= offset; dirtmp = direction; - ret = iommu_tce_xchg(container->mm, tbl, entry + i, &hpa, - &dirtmp); + ret = iommu_tce_xchg_no_kill(container->mm, tbl, entry + i, + &hpa, &dirtmp); if (ret) { tce_iommu_unuse_page(container, hpa); pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", @@ -536,6 +538,8 @@ static long tce_iommu_build(struct tce_container *container, if (ret) tce_iommu_clear(container, tbl, entry, i); + else + iommu_tce_kill(tbl, entry, pages); return ret; } @@ -572,8 +576,8 @@ static long tce_iommu_build_v2(struct tce_container *container, if (mm_iommu_mapped_inc(mem)) break; - ret = iommu_tce_xchg(container->mm, tbl, entry + i, &hpa, - &dirtmp); + ret = iommu_tce_xchg_no_kill(container->mm, tbl, entry + i, + &hpa, &dirtmp); if (ret) { /* dirtmp cannot be DMA_NONE here */ tce_iommu_unuse_page_v2(container, tbl, entry + i); @@ -593,6 +597,8 @@ static long tce_iommu_build_v2(struct tce_container *container, if (ret) tce_iommu_clear(container, tbl, entry, i); + else + iommu_tce_kill(tbl, entry, pages); return ret; } |