| Message ID | 20170616181059.19206-7-hch@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 16/06/17 19:10, Christoph Hellwig wrote: > DMA_ERROR_CODE is not a public API and will go away soon. dma dma-iommu > driver already implements a proper ->mapping_error method, so it's only > using the value internally. Add a new local define using the value > that arm64 which is the only current user of dma-iommu. I was angling at just open-coding 0/!dma_addr/etc. for simplicity rather than having anything #defined at all - nothing except the 4th and final hunks actually have any relevance to dma_mapping_error(), and I reckon it's plenty clear enough in context. The rest is just proactively blatting address arguments with "arbitrary definitely-invalid value", which is more paranoia than anything else (and arguably unnecessary). It's not the biggest deal, though, so either way: Reviewed-by: Robin Murphy <robin.murphy@arm.com> > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > drivers/iommu/dma-iommu.c | 18 ++++++++++-------- > 1 file changed, 10 insertions(+), 8 deletions(-) > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index 62618e77bedc..9403336f1fa6 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -31,6 +31,8 @@ > #include <linux/scatterlist.h> > #include <linux/vmalloc.h> > > +#define IOMMU_MAPPING_ERROR 0 > + > struct iommu_dma_msi_page { > struct list_head list; > dma_addr_t iova; > @@ -500,7 +502,7 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size, > { > __iommu_dma_unmap(iommu_get_domain_for_dev(dev), *handle, size); > __iommu_dma_free_pages(pages, PAGE_ALIGN(size) >> PAGE_SHIFT); > - *handle = DMA_ERROR_CODE; > + *handle = IOMMU_MAPPING_ERROR; > } > > /** > @@ -533,7 +535,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp, > dma_addr_t iova; > unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap; > > - *handle = DMA_ERROR_CODE; > + *handle = IOMMU_MAPPING_ERROR; > > min_size = alloc_sizes & -alloc_sizes; > if (min_size < PAGE_SIZE) { > @@ -627,11 +629,11 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, > > iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev); > if (!iova) > - return DMA_ERROR_CODE; > + return IOMMU_MAPPING_ERROR; > > if (iommu_map(domain, iova, phys - iova_off, size, prot)) { > iommu_dma_free_iova(cookie, iova, size); > - return DMA_ERROR_CODE; > + return IOMMU_MAPPING_ERROR; > } > return iova + iova_off; > } > @@ -671,7 +673,7 @@ static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents, > > s->offset += s_iova_off; > s->length = s_length; > - sg_dma_address(s) = DMA_ERROR_CODE; > + sg_dma_address(s) = IOMMU_MAPPING_ERROR; > sg_dma_len(s) = 0; > > /* > @@ -714,11 +716,11 @@ static void __invalidate_sg(struct scatterlist *sg, int nents) > int i; > > for_each_sg(sg, s, nents, i) { > - if (sg_dma_address(s) != DMA_ERROR_CODE) > + if (sg_dma_address(s) != IOMMU_MAPPING_ERROR) > s->offset += sg_dma_address(s); > if (sg_dma_len(s)) > s->length = sg_dma_len(s); > - sg_dma_address(s) = DMA_ERROR_CODE; > + sg_dma_address(s) = IOMMU_MAPPING_ERROR; > sg_dma_len(s) = 0; > } > } > @@ -836,7 +838,7 @@ void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle, > > int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) > { > - return dma_addr == DMA_ERROR_CODE; > + return dma_addr == IOMMU_MAPPING_ERROR; > } > > static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev, >
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 62618e77bedc..9403336f1fa6 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -31,6 +31,8 @@ #include <linux/scatterlist.h> #include <linux/vmalloc.h> +#define IOMMU_MAPPING_ERROR 0 + struct iommu_dma_msi_page { struct list_head list; dma_addr_t iova; @@ -500,7 +502,7 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size, { __iommu_dma_unmap(iommu_get_domain_for_dev(dev), *handle, size); __iommu_dma_free_pages(pages, PAGE_ALIGN(size) >> PAGE_SHIFT); - *handle = DMA_ERROR_CODE; + *handle = IOMMU_MAPPING_ERROR; } /** @@ -533,7 +535,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp, dma_addr_t iova; unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap; - *handle = DMA_ERROR_CODE; + *handle = IOMMU_MAPPING_ERROR; min_size = alloc_sizes & -alloc_sizes; if (min_size < PAGE_SIZE) { @@ -627,11 +629,11 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev); if (!iova) - return DMA_ERROR_CODE; + return IOMMU_MAPPING_ERROR; if (iommu_map(domain, iova, phys - iova_off, size, prot)) { iommu_dma_free_iova(cookie, iova, size); - return DMA_ERROR_CODE; + return IOMMU_MAPPING_ERROR; } return iova + iova_off; } @@ -671,7 +673,7 @@ static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents, s->offset += s_iova_off; s->length = s_length; - sg_dma_address(s) = DMA_ERROR_CODE; + sg_dma_address(s) = IOMMU_MAPPING_ERROR; sg_dma_len(s) = 0; /* @@ -714,11 +716,11 @@ static void __invalidate_sg(struct scatterlist *sg, int nents) int i; for_each_sg(sg, s, nents, i) { - if (sg_dma_address(s) != DMA_ERROR_CODE) + if (sg_dma_address(s) != IOMMU_MAPPING_ERROR) s->offset += sg_dma_address(s); if (sg_dma_len(s)) s->length = sg_dma_len(s); - sg_dma_address(s) = DMA_ERROR_CODE; + sg_dma_address(s) = IOMMU_MAPPING_ERROR; sg_dma_len(s) = 0; } } @@ -836,7 +838,7 @@ void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle, int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { - return dma_addr == DMA_ERROR_CODE; + return dma_addr == IOMMU_MAPPING_ERROR; } static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
DMA_ERROR_CODE is not a public API and will go away soon. dma dma-iommu driver already implements a proper ->mapping_error method, so it's only using the value internally. Add a new local define using the value that arm64 which is the only current user of dma-iommu. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/iommu/dma-iommu.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-)