[PATCH 14/24] ia64/sba_iommu: improve internal map_page users

Christoph Hellwig
2018-11-22T14:03:10Z

Remove the odd sba_{un,}map_single_attrs wrappers, check errors
everywhere, and remove the completly bogus alloc_pages_node call that
uses the dma attributes argument as the node id.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/ia64/hp/common/sba_iommu.c | 71 ++++++++++++---------------------
1 file changed, 26 insertions(+), 45 deletions(-)

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index e8a93b07283e..b953282d4704 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -907,11 +907,12 @@ sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
}

/**
- * sba_map_single_attrs - map one buffer and return IOVA for DMA
+ * sba_map_page - map one buffer and return IOVA for DMA
* @dev: instance of PCI owned by the driver that's asking.
- * @addr: driver buffer to map.
- * @size: number of bytes to map in driver buffer.
- * @dir: R/W or both.
+ * @page: page to map
+ * @poff: offset into page
+ * @size: number of bytes to map
+ * @dir: dma direction
* @attrs: optional dma attributes
*
* See Documentation/DMA-API-HOWTO.txt
@@ -944,7 +945,7 @@ static dma_addr_t sba_map_page(struct device *dev, struct page *page,
** Device is bit capable of DMA'ing to the buffer...
** just return the PCI address of ptr
*/
- DBG_BYPASS("sba_map_single_attrs() bypass mask/addr: "
+ DBG_BYPASS("sba_map_page() bypass mask/addr: "
"0x%lx/0x%lx\n",
to_pci_dev(dev)->dma_mask, pci_addr);
return pci_addr;
@@ -966,7 +967,7 @@ static dma_addr_t sba_map_page(struct device *dev, struct page *page,

#ifdef ASSERT_PDIR_SANITY
spin_lock_irqsave(&ioc->res_lock, flags);
- if (sba_check_pdir(ioc,"Check before sba_map_single_attrs()"))
+ if (sba_check_pdir(ioc,"Check before sba_map_page()"))
panic("Sanity check failed");
spin_unlock_irqrestore(&ioc->res_lock, flags);
#endif
@@ -997,20 +998,12 @@ static dma_addr_t sba_map_page(struct device *dev, struct page *page,
/* form complete address */
#ifdef ASSERT_PDIR_SANITY
spin_lock_irqsave(&ioc->res_lock, flags);
- sba_check_pdir(ioc,"Check after sba_map_single_attrs()");
+ sba_check_pdir(ioc,"Check after sba_map_page()");
spin_unlock_irqrestore(&ioc->res_lock, flags);
#endif
return SBA_IOVA(ioc, iovp, offset);
}

-static dma_addr_t sba_map_single_attrs(struct device *dev, void *addr,
- size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- return sba_map_page(dev, virt_to_page(addr),
- (unsigned long)addr & ~PAGE_MASK, size, dir, attrs);
-}
-
#ifdef ENABLE_MARK_CLEAN
static SBA_INLINE void
sba_mark_clean(struct ioc *ioc, dma_addr_t iova, size_t size)
@@ -1036,7 +1029,7 @@ sba_mark_clean(struct ioc *ioc, dma_addr_t iova, size_t size)
#endif

/**
- * sba_unmap_single_attrs - unmap one IOVA and free resources
+ * sba_unmap_page - unmap one IOVA and free resources
* @dev: instance of PCI owned by the driver that's asking.
* @iova: IOVA of driver buffer previously mapped.
* @size: number of bytes mapped in driver buffer.
@@ -1063,7 +1056,7 @@ static void sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
/*
** Address does not fall w/in IOVA, must be bypassing
*/
- DBG_BYPASS("sba_unmap_single_attrs() bypass addr: 0x%lx\n",
+ DBG_BYPASS("sba_unmap_page() bypass addr: 0x%lx\n",
iova);

#ifdef ENABLE_MARK_CLEAN
@@ -1114,12 +1107,6 @@ static void sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
#endif /* DELAYED_RESOURCE_CNT = 0 */
}

-void sba_unmap_single_attrs(struct device *dev, dma_addr_t iova, size_t size,
- enum dma_data_direction dir, unsigned long attrs)
-{
- sba_unmap_page(dev, iova, size, dir, attrs);
-}
-
/**
* sba_alloc_coherent - allocate/map shared mem for DMA
* @dev: instance of PCI owned by the driver that's asking.
@@ -1132,30 +1119,20 @@ static void *
sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flags, unsigned long attrs)
{
+ struct page *page;
struct ioc *ioc;
void *addr;

ioc = GET_IOC(dev);
ASSERT(ioc);

-#ifdef CONFIG_NUMA
- {
- struct page *page;
-
- page = alloc_pages_node(ioc->node, flags, get_order(size));
- if (unlikely(!page))
- return NULL;
-
- addr = page_address(page);
- }
-#else
- addr = (void *) __get_free_pages(flags, get_order(size));
-#endif
- if (unlikely(!addr))
+ page = alloc_pages(ioc->node, get_order(size));
+ if (unlikely(!page))
return NULL;

+ addr = page_address(page);
memset(addr, 0, size);
- *dma_handle = virt_to_phys(addr);
+ *dma_handle = page_to_phys(page);

#ifdef ALLOW_IOV_BYPASS
ASSERT(dev->coherent_dma_mask);
@@ -1174,9 +1151,10 @@ sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
* If device can't bypass or bypass is disabled, pass the 32bit fake
* device to map single to get an iova mapping.
*/
- *dma_handle = sba_map_single_attrs(&ioc->sac_only_dev->dev, addr,
- size, 0, 0);
-
+ *dma_handle = sba_map_page(&ioc->sac_only_dev->dev, page, 0, size,
+ DMA_BIDIRECTIONAL, 0);
+ if (dma_mapping_error(dev, *dma_handle))
+ return NULL;
return addr;
}

@@ -1193,7 +1171,7 @@ sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
static void sba_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
- sba_unmap_single_attrs(dev, dma_handle, size, 0, 0);
+ sba_unmap_page(dev, dma_handle, size, 0, 0);
free_pages((unsigned long) vaddr, get_order(size));
}

@@ -1483,7 +1461,10 @@ static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
/* Fast path single entry scatterlists. */
if (nents = 1) {
sglist->dma_length = sglist->length;
- sglist->dma_address = sba_map_single_attrs(dev, sba_sg_address(sglist), sglist->length, dir, attrs);
+ sglist->dma_address = sba_map_page(dev, sg_page(sglist),
+ sglist->offset, sglist->length, dir, attrs);
+ if (dma_mapping_error(dev, sglist->dma_address))
+ return 0;
return 1;
}

@@ -1572,8 +1553,8 @@ static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,

while (nents && sglist->dma_length) {

- sba_unmap_single_attrs(dev, sglist->dma_address,
- sglist->dma_length, dir, attrs);
+ sba_unmap_page(dev, sglist->dma_address, sglist->dma_length,
+ dir, attrs);
sglist = sg_next(sglist);
nents--;
}
--
2.19.1