From 2c941a204070ab32d92d40318a3196a7fb994c00 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 7 Aug 2007 09:37:10 +0200 Subject: SPARC64: sg chaining support This updates the sparc64 iommu/pci dma mappers to sg chaining. Acked-by: David S. Miller Later updated to newer kernel with unified sparc64 iommu sg handling. Signed-off-by: Jens Axboe --- arch/sparc64/kernel/iommu.c | 39 ++++++++++++++++++++++++--------------- 1 file changed, 24 insertions(+), 15 deletions(-) (limited to 'arch/sparc64/kernel/iommu.c') diff --git a/arch/sparc64/kernel/iommu.c b/arch/sparc64/kernel/iommu.c index b35a62167e9c..db3ffcf7a120 100644 --- a/arch/sparc64/kernel/iommu.c +++ b/arch/sparc64/kernel/iommu.c @@ -10,6 +10,7 @@ #include #include #include +#include #ifdef CONFIG_PCI #include @@ -480,7 +481,7 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg, unsigned long iopte_protection) { struct scatterlist *dma_sg = sg; - struct scatterlist *sg_end = sg + nelems; + struct scatterlist *sg_end = sg_last(sg, nelems); int i; for (i = 0; i < nused; i++) { @@ -515,7 +516,7 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg, len -= (IO_PAGE_SIZE - (tmp & (IO_PAGE_SIZE - 1UL))); break; } - sg++; + sg = sg_next(sg); } pteval = iopte_protection | (pteval & IOPTE_PAGE); @@ -528,24 +529,24 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg, } pteval = (pteval & IOPTE_PAGE) + len; - sg++; + sg = sg_next(sg); /* Skip over any tail mappings we've fully mapped, * adjusting pteval along the way. Stop when we * detect a page crossing event. */ - while (sg < sg_end && + while (sg != sg_end && (pteval << (64 - IO_PAGE_SHIFT)) != 0UL && (pteval == SG_ENT_PHYS_ADDRESS(sg)) && ((pteval ^ (SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) { pteval += sg->length; - sg++; + sg = sg_next(sg); } if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL) pteval = ~0UL; } while (dma_npages != 0); - dma_sg++; + dma_sg = sg_next(dma_sg); } } @@ -606,7 +607,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist, sgtmp = sglist; while (used && sgtmp->dma_length) { sgtmp->dma_address += dma_base; - sgtmp++; + sgtmp = sg_next(sgtmp); used--; } used = nelems - used; @@ -642,6 +643,7 @@ static void dma_4u_unmap_sg(struct device *dev, struct scatterlist *sglist, struct strbuf *strbuf; iopte_t *base; unsigned long flags, ctx, i, npages; + struct scatterlist *sg, *sgprv; u32 bus_addr; if (unlikely(direction == DMA_NONE)) { @@ -654,11 +656,14 @@ static void dma_4u_unmap_sg(struct device *dev, struct scatterlist *sglist, bus_addr = sglist->dma_address & IO_PAGE_MASK; - for (i = 1; i < nelems; i++) - if (sglist[i].dma_length == 0) + sgprv = NULL; + for_each_sg(sglist, sg, nelems, i) { + if (sg->dma_length == 0) break; - i--; - npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) - + sgprv = sg; + } + + npages = (IO_PAGE_ALIGN(sgprv->dma_address + sgprv->dma_length) - bus_addr) >> IO_PAGE_SHIFT; base = iommu->page_table + @@ -730,6 +735,7 @@ static void dma_4u_sync_sg_for_cpu(struct device *dev, struct iommu *iommu; struct strbuf *strbuf; unsigned long flags, ctx, npages, i; + struct scatterlist *sg, *sgprv; u32 bus_addr; iommu = dev->archdata.iommu; @@ -753,11 +759,14 @@ static void dma_4u_sync_sg_for_cpu(struct device *dev, /* Step 2: Kick data out of streaming buffers. */ bus_addr = sglist[0].dma_address & IO_PAGE_MASK; - for(i = 1; i < nelems; i++) - if (!sglist[i].dma_length) + sgprv = NULL; + for_each_sg(sglist, sg, nelems, i) { + if (sg->dma_length == 0) break; - i--; - npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) + sgprv = sg; + } + + npages = (IO_PAGE_ALIGN(sgprv->dma_address + sgprv->dma_length) - bus_addr) >> IO_PAGE_SHIFT; strbuf_flush(strbuf, iommu, bus_addr, ctx, npages, direction); -- cgit v1.2.3-59-g8ed1b