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Commit 6009faa4 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

powerpc: implement ->mapping_error 



DMA_ERROR_CODE is going to go away, so don't rely on it.  Instead
define a ->mapping_error method for all IOMMU based dma operation
instances.  The direct ops don't ever return an error and don't
need a ->mapping_error method.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent ceaf481c

arch/powerpc/include/asm/dma-mapping.h

+0 −4
Original line number Diff line number Diff line
@@ -17,10 +17,6 @@ 
#include <asm/io.h>

#include <asm/swiotlb.h>



#ifdef CONFIG_PPC64

#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)

#endif



/* Some dma direct funcs must be visible for use in other dma_ops */

extern void *__dma_direct_alloc_coherent(struct device *dev, size_t size,

					 dma_addr_t *dma_handle, gfp_t flag,

arch/powerpc/include/asm/iommu.h

+4 −0
Original line number Diff line number Diff line
@@ -139,6 +139,8 @@ struct scatterlist; 


#ifdef CONFIG_PPC64



#define IOMMU_MAPPING_ERROR		(~(dma_addr_t)0x0)



static inline void set_iommu_table_base(struct device *dev,

					struct iommu_table *base)

{
@@ -238,6 +240,8 @@ static inline int __init tce_iommu_bus_notifier_init(void) 
}

#endif /* !CONFIG_IOMMU_API */



int dma_iommu_mapping_error(struct device *dev, dma_addr_t dma_addr);



#else



static inline void *get_iommu_table_base(struct device *dev)

arch/powerpc/kernel/dma-iommu.c

+6 −0
Original line number Diff line number Diff line
@@ -105,6 +105,11 @@ static u64 dma_iommu_get_required_mask(struct device *dev) 
	return mask;

}



int dma_iommu_mapping_error(struct device *dev, dma_addr_t dma_addr)

{

	return dma_addr == IOMMU_MAPPING_ERROR;

}



struct dma_map_ops dma_iommu_ops = {

	.alloc			= dma_iommu_alloc_coherent,

	.free			= dma_iommu_free_coherent,
@@ -115,5 +120,6 @@ struct dma_map_ops dma_iommu_ops = { 
	.map_page		= dma_iommu_map_page,

	.unmap_page		= dma_iommu_unmap_page,

	.get_required_mask	= dma_iommu_get_required_mask,

	.mapping_error		= dma_iommu_mapping_error,

};

EXPORT_SYMBOL(dma_iommu_ops);

arch/powerpc/kernel/iommu.c

+14 −14
Original line number Diff line number Diff line
@@ -198,11 +198,11 @@ static unsigned long iommu_range_alloc(struct device *dev, 
	if (unlikely(npages == 0)) {

		if (printk_ratelimit())

			WARN_ON(1);

		return DMA_ERROR_CODE;

		return IOMMU_MAPPING_ERROR;

	}



	if (should_fail_iommu(dev))

		return DMA_ERROR_CODE;

		return IOMMU_MAPPING_ERROR;



	/*

	 * We don't need to disable preemption here because any CPU can
@@ -278,7 +278,7 @@ static unsigned long iommu_range_alloc(struct device *dev, 
		} else {

			/* Give up */

			spin_unlock_irqrestore(&(pool->lock), flags);

			return DMA_ERROR_CODE;

			return IOMMU_MAPPING_ERROR;

		}

	}
@@ -310,13 +310,13 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl, 
			      unsigned long attrs)

{

	unsigned long entry;

	dma_addr_t ret = DMA_ERROR_CODE;

	dma_addr_t ret = IOMMU_MAPPING_ERROR;

	int build_fail;



	entry = iommu_range_alloc(dev, tbl, npages, NULL, mask, align_order);



	if (unlikely(entry == DMA_ERROR_CODE))

		return DMA_ERROR_CODE;

	if (unlikely(entry == IOMMU_MAPPING_ERROR))

		return IOMMU_MAPPING_ERROR;



	entry += tbl->it_offset;	/* Offset into real TCE table */

	ret = entry << tbl->it_page_shift;	/* Set the return dma address */
@@ -328,12 +328,12 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl, 


	/* tbl->it_ops->set() only returns non-zero for transient errors.

	 * Clean up the table bitmap in this case and return

	 * DMA_ERROR_CODE. For all other errors the functionality is

	 * IOMMU_MAPPING_ERROR. For all other errors the functionality is

	 * not altered.

	 */

	if (unlikely(build_fail)) {

		__iommu_free(tbl, ret, npages);

		return DMA_ERROR_CODE;

		return IOMMU_MAPPING_ERROR;

	}



	/* Flush/invalidate TLB caches if necessary */
@@ -478,7 +478,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl, 
		DBG("  - vaddr: %lx, size: %lx\n", vaddr, slen);



		/* Handle failure */

		if (unlikely(entry == DMA_ERROR_CODE)) {

		if (unlikely(entry == IOMMU_MAPPING_ERROR)) {

			if (!(attrs & DMA_ATTR_NO_WARN) &&

			    printk_ratelimit())

				dev_info(dev, "iommu_alloc failed, tbl %p "
@@ -545,7 +545,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl, 
	 */

	if (outcount < incount) {

		outs = sg_next(outs);

		outs->dma_address = DMA_ERROR_CODE;

		outs->dma_address = IOMMU_MAPPING_ERROR;

		outs->dma_length = 0;

	}
@@ -563,7 +563,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl, 
			npages = iommu_num_pages(s->dma_address, s->dma_length,

						 IOMMU_PAGE_SIZE(tbl));

			__iommu_free(tbl, vaddr, npages);

			s->dma_address = DMA_ERROR_CODE;

			s->dma_address = IOMMU_MAPPING_ERROR;

			s->dma_length = 0;

		}

		if (s == outs)
@@ -777,7 +777,7 @@ dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl, 
			  unsigned long mask, enum dma_data_direction direction,

			  unsigned long attrs)

{

	dma_addr_t dma_handle = DMA_ERROR_CODE;

	dma_addr_t dma_handle = IOMMU_MAPPING_ERROR;

	void *vaddr;

	unsigned long uaddr;

	unsigned int npages, align;
@@ -797,7 +797,7 @@ dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl, 
		dma_handle = iommu_alloc(dev, tbl, vaddr, npages, direction,

					 mask >> tbl->it_page_shift, align,

					 attrs);

		if (dma_handle == DMA_ERROR_CODE) {

		if (dma_handle == IOMMU_MAPPING_ERROR) {

			if (!(attrs & DMA_ATTR_NO_WARN) &&

			    printk_ratelimit())  {

				dev_info(dev, "iommu_alloc failed, tbl %p "
@@ -869,7 +869,7 @@ void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl, 
	io_order = get_iommu_order(size, tbl);

	mapping = iommu_alloc(dev, tbl, ret, nio_pages, DMA_BIDIRECTIONAL,

			      mask >> tbl->it_page_shift, io_order, 0);

	if (mapping == DMA_ERROR_CODE) {

	if (mapping == IOMMU_MAPPING_ERROR) {

		free_pages((unsigned long)ret, order);

		return NULL;

	}

arch/powerpc/platforms/cell/iommu.c

+1 −0
Original line number Diff line number Diff line
@@ -660,6 +660,7 @@ static const struct dma_map_ops dma_iommu_fixed_ops = { 
	.set_dma_mask   = dma_set_mask_and_switch,

	.map_page       = dma_fixed_map_page,

	.unmap_page     = dma_fixed_unmap_page,

	.mapping_error	= dma_iommu_mapping_error,

};



static void cell_dma_dev_setup_fixed(struct device *dev);