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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: Christoph Hellwig <hch@lst.de>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christoph Hellwig 2017-05-21 14:17:10 +02:00
parent ceaf481c4f
commit 6009faa43f
6 changed files with 27 additions and 19 deletions
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4
arch/powerpc/include/asm/dma-mapping.h
View File

@ -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,

4
arch/powerpc/include/asm/iommu.h
View File

@ -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)

6
arch/powerpc/kernel/dma-iommu.c
View File

@ -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);

28
arch/powerpc/kernel/iommu.c
View File

@ -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 @@ again:
} 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;
}

1
arch/powerpc/platforms/cell/iommu.c
View File

@ -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);

3
arch/powerpc/platforms/pseries/vio.c
View File

@ -519,7 +519,7 @@ static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
{
struct vio_dev *viodev = to_vio_dev(dev);
struct iommu_table *tbl;
dma_addr_t ret = DMA_ERROR_CODE;
dma_addr_t ret = IOMMU_MAPPING_ERROR;
tbl = get_iommu_table_base(dev);
if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)))) {
@ -625,6 +625,7 @@ static const struct dma_map_ops vio_dma_mapping_ops = {
.unmap_page = vio_dma_iommu_unmap_page,
.dma_supported = vio_dma_iommu_dma_supported,
.get_required_mask = vio_dma_get_required_mask,
.mapping_error = dma_iommu_mapping_error,
};
/**