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| author | Joerg Roedel <jroedel@suse.de> | 2018-11-09 12:07:12 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2018-11-15 16:40:55 +0100 |
| commit | 7a30423a95a11ac474115f07cba7f6071f75ff81 (patch) | |
| tree | 164a57f5423562263258900f254fae839ccca3a6 /drivers/vfio | |
| parent | 6f820bb995b657ad69197679b4d626cf226bfd35 (diff) | |
| download | linux-7a30423a95a11ac474115f07cba7f6071f75ff81.tar.bz2 | |
vfio/type1: Remove map_try_harder() code path
The AMD IOMMU driver can now map a huge-page where smaller
mappings existed before, so this code-path is no longer
triggered.
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio_iommu_type1.c | 33 |
1 files changed, 2 insertions, 31 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index d9fd3188615d..7651cfb14836 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -978,32 +978,6 @@ unlock: return ret; } -/* - * Turns out AMD IOMMU has a page table bug where it won't map large pages - * to a region that previously mapped smaller pages. This should be fixed - * soon, so this is just a temporary workaround to break mappings down into - * PAGE_SIZE. Better to map smaller pages than nothing. - */ -static int map_try_harder(struct vfio_domain *domain, dma_addr_t iova, - unsigned long pfn, long npage, int prot) -{ - long i; - int ret = 0; - - for (i = 0; i < npage; i++, pfn++, iova += PAGE_SIZE) { - ret = iommu_map(domain->domain, iova, - (phys_addr_t)pfn << PAGE_SHIFT, - PAGE_SIZE, prot | domain->prot); - if (ret) - break; - } - - for (; i < npage && i > 0; i--, iova -= PAGE_SIZE) - iommu_unmap(domain->domain, iova, PAGE_SIZE); - - return ret; -} - static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova, unsigned long pfn, long npage, int prot) { @@ -1013,11 +987,8 @@ static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova, list_for_each_entry(d, &iommu->domain_list, next) { ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT, npage << PAGE_SHIFT, prot | d->prot); - if (ret) { - if (ret != -EBUSY || - map_try_harder(d, iova, pfn, npage, prot)) - goto unwind; - } + if (ret) + goto unwind; cond_resched(); } |