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x86/calgary: implement ->mapping_error 

DMA_ERROR_CODE is going to go away, so don't rely on it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2017-05-22 10:36:43 +02:00
parent 14a9aad7f0
commit 8bd17c6670
1 changed files with 16 additions and 8 deletions
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24
arch/x86/kernel/pci-calgary_64.c
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@ -50,6 +50,8 @@
#include <asm/x86_init.h>
#include <asm/iommu_table.h>
#define CALGARY_MAPPING_ERROR 0
#ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT
int use_calgary __read_mostly = 1;
#else
@ -252,7 +254,7 @@ static unsigned long iommu_range_alloc(struct device *dev,
if (panic_on_overflow)
panic("Calgary: fix the allocator.\n");
else
return DMA_ERROR_CODE;
return CALGARY_MAPPING_ERROR;
}
}
@ -272,10 +274,10 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
entry = iommu_range_alloc(dev, tbl, npages);
if (unlikely(entry == DMA_ERROR_CODE)) {
if (unlikely(entry == CALGARY_MAPPING_ERROR)) {
pr_warn("failed to allocate %u pages in iommu %p\n",
npages, tbl);
return DMA_ERROR_CODE;
return CALGARY_MAPPING_ERROR;
}
/* set the return dma address */
@ -295,7 +297,7 @@ static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
unsigned long flags;
/* were we called with bad_dma_address? */
badend = DMA_ERROR_CODE + (EMERGENCY_PAGES * PAGE_SIZE);
badend = CALGARY_MAPPING_ERROR + (EMERGENCY_PAGES * PAGE_SIZE);
if (unlikely(dma_addr < badend)) {
WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA "
"address 0x%Lx\n", dma_addr);
@ -380,7 +382,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE);
entry = iommu_range_alloc(dev, tbl, npages);
if (entry == DMA_ERROR_CODE) {
if (entry == CALGARY_MAPPING_ERROR) {
/* makes sure unmap knows to stop */
s->dma_length = 0;
goto error;
@ -398,7 +400,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
error:
calgary_unmap_sg(dev, sg, nelems, dir, 0);
for_each_sg(sg, s, nelems, i) {
sg->dma_address = DMA_ERROR_CODE;
sg->dma_address = CALGARY_MAPPING_ERROR;
sg->dma_length = 0;
}
return 0;
@ -453,7 +455,7 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size,
/* set up tces to cover the allocated range */
mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL);
if (mapping == DMA_ERROR_CODE)
if (mapping == CALGARY_MAPPING_ERROR)
goto free;
*dma_handle = mapping;
return ret;
@ -478,6 +480,11 @@ static void calgary_free_coherent(struct device *dev, size_t size,
free_pages((unsigned long)vaddr, get_order(size));
}
static int calgary_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return dma_addr == CALGARY_MAPPING_ERROR;
}
static const struct dma_map_ops calgary_dma_ops = {
.alloc = calgary_alloc_coherent,
.free = calgary_free_coherent,
@ -485,6 +492,7 @@ static const struct dma_map_ops calgary_dma_ops = {
.unmap_sg = calgary_unmap_sg,
.map_page = calgary_map_page,
.unmap_page = calgary_unmap_page,
.mapping_error = calgary_mapping_error,
};
static inline void __iomem * busno_to_bbar(unsigned char num)
@ -732,7 +740,7 @@ static void __init calgary_reserve_regions(struct pci_dev *dev)
struct iommu_table *tbl = pci_iommu(dev->bus);
/* reserve EMERGENCY_PAGES from bad_dma_address and up */
iommu_range_reserve(tbl, DMA_ERROR_CODE, EMERGENCY_PAGES);
iommu_range_reserve(tbl, CALGARY_MAPPING_ERROR, EMERGENCY_PAGES);
/* avoid the BIOS/VGA first 640KB-1MB region */
/* for CalIOC2 - avoid the entire first MB */