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authorJoerg Roedel <jroedel@suse.de>2018-11-09 14:07:12 +0300
committerJoerg Roedel <jroedel@suse.de>2018-11-15 18:40:55 +0300
commit7a30423a95a11ac474115f07cba7f6071f75ff81 (patch)
tree164a57f5423562263258900f254fae839ccca3a6 /drivers/vfio
parent6f820bb995b657ad69197679b4d626cf226bfd35 (diff)
downloadlinux-7a30423a95a11ac474115f07cba7f6071f75ff81.tar.xz
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.c33
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();
}