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s390: implement ->mapping_error

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s390 can also use noop_dma_ops, and while that currently does not return
errors it will so in the future.  Implementing the mapping_error method
is the proper way to have per-ops error conditions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
This commit is contained in:
Christoph Hellwig 2017-05-21 13:04:09 +02:00
parent a869572c31
commit 81cac18e11
2 changed files with 13 additions and 7 deletions
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2
arch/s390/include/asm/dma-mapping.h
View File

@ -8,8 +8,6 @@
#include <linux/dma-debug.h>
#include <linux/io.h>
#define DMA_ERROR_CODE (~(dma_addr_t) 0x0)
extern const struct dma_map_ops s390_pci_dma_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)

18
arch/s390/pci/pci_dma.c
View File

@ -14,6 +14,8 @@
#include <linux/pci.h>
#include <asm/pci_dma.h>
#define S390_MAPPING_ERROR (~(dma_addr_t) 0x0)
static struct kmem_cache *dma_region_table_cache;
static struct kmem_cache *dma_page_table_cache;
static int s390_iommu_strict;
@ -281,7 +283,7 @@ static dma_addr_t dma_alloc_address(struct device *dev, int size)
out_error:
spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
return DMA_ERROR_CODE;
return S390_MAPPING_ERROR;
}
static void dma_free_address(struct device *dev, dma_addr_t dma_addr, int size)
@ -329,7 +331,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
/* This rounds up number of pages based on size and offset */
nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
dma_addr = dma_alloc_address(dev, nr_pages);
if (dma_addr == DMA_ERROR_CODE) {
if (dma_addr == S390_MAPPING_ERROR) {
ret = -ENOSPC;
goto out_err;
}
@ -352,7 +354,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
out_err:
zpci_err("map error:\n");
zpci_err_dma(ret, pa);
return DMA_ERROR_CODE;
return S390_MAPPING_ERROR;
}
static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
@ -429,7 +431,7 @@ static int __s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
int ret;
dma_addr_base = dma_alloc_address(dev, nr_pages);
if (dma_addr_base == DMA_ERROR_CODE)
if (dma_addr_base == S390_MAPPING_ERROR)
return -ENOMEM;
dma_addr = dma_addr_base;
@ -476,7 +478,7 @@ static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
for (i = 1; i < nr_elements; i++) {
s = sg_next(s);
s->dma_address = DMA_ERROR_CODE;
s->dma_address = S390_MAPPING_ERROR;
s->dma_length = 0;
if (s->offset || (size & ~PAGE_MASK) ||
@ -525,6 +527,11 @@ static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
s->dma_length = 0;
}
}
static int s390_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return dma_addr == S390_MAPPING_ERROR;
}
int zpci_dma_init_device(struct zpci_dev *zdev)
{
@ -657,6 +664,7 @@ const struct dma_map_ops s390_pci_dma_ops = {
.unmap_sg = s390_dma_unmap_sg,
.map_page = s390_dma_map_pages,
.unmap_page = s390_dma_unmap_pages,
.mapping_error = s390_mapping_error,
/* if we support direct DMA this must be conditional */
.is_phys = 0,
/* dma_supported is unconditionally true without a callback */