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drm/msm: convert to iommu_map_sg

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Significantly simplifies things.  Also iommu_unmap() can unmap an entire
iova range.

(If backporting to downstream kernel you might need to revert this.  Or
at least double check older iommu implementation.)

Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Rob Clark 2017-02-15 15:44:04 -05:00
parent de098e5fb1
commit f90000492e
1 changed files with 5 additions and 49 deletions
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54
drivers/gpu/drm/msm/msm_iommu.c
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@ -52,64 +52,20 @@ static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova,
struct sg_table *sgt, unsigned len, int prot)
{
struct msm_iommu *iommu = to_msm_iommu(mmu);
struct iommu_domain *domain = iommu->domain;
struct scatterlist *sg;
unsigned long da = iova;
unsigned int i, j;
int ret;
size_t ret;
if (!domain || !sgt)
return -EINVAL;
ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot);
WARN_ON(ret < 0);
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
dma_addr_t pa = sg_phys(sg) - sg->offset;
size_t bytes = sg->length + sg->offset;
VERB("map[%d]: %08lx %08lx(%zx)", i, da, (unsigned long)pa, bytes);
ret = iommu_map(domain, da, pa, bytes, prot);
if (ret)
goto fail;
da += bytes;
}
return 0;
fail:
da = iova;
for_each_sg(sgt->sgl, sg, i, j) {
size_t bytes = sg->length + sg->offset;
iommu_unmap(domain, da, bytes);
da += bytes;
}
return ret;
return (ret == len) ? 0 : -EINVAL;
}
static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova,
struct sg_table *sgt, unsigned len)
{
struct msm_iommu *iommu = to_msm_iommu(mmu);
struct iommu_domain *domain = iommu->domain;
struct scatterlist *sg;
unsigned long da = iova;
int i;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
size_t bytes = sg->length + sg->offset;
size_t unmapped;
unmapped = iommu_unmap(domain, da, bytes);
if (unmapped < bytes)
return unmapped;
VERB("unmap[%d]: %08lx(%zx)", i, da, bytes);
BUG_ON(!PAGE_ALIGNED(bytes));
da += bytes;
}
iommu_unmap(iommu->domain, iova, len);
return 0;
}