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iommu-common: Fix error code used in iommu_tbl_range_{alloc,free}(). 

The value returned from iommu_tbl_range_alloc() (and the one passed
in as a fourth argument to iommu_tbl_range_free) is not a DMA address,
it is rather an index into the IOMMU page table.

Therefore using DMA_ERROR_CODE is not appropriate.

Use a more type matching error code define, IOMMU_ERROR_CODE, and
update all users of this interface.

Reported-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-11-04 11:30:57 -08:00
parent 73958c651f
commit d618382ba5
5 changed files with 20 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/sparc/kernel/iommu.c
View File

@ -161,7 +161,7 @@ static inline iopte_t *alloc_npages(struct device *dev,
entry = iommu_tbl_range_alloc(dev, &iommu->tbl, npages, NULL,
(unsigned long)(-1), 0);
if (unlikely(entry == DMA_ERROR_CODE))
if (unlikely(entry == IOMMU_ERROR_CODE))
return NULL;
return iommu->page_table + entry;
@ -253,7 +253,7 @@ static void dma_4u_free_coherent(struct device *dev, size_t size,
npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
iommu = dev->archdata.iommu;
iommu_tbl_range_free(&iommu->tbl, dvma, npages, DMA_ERROR_CODE);
iommu_tbl_range_free(&iommu->tbl, dvma, npages, IOMMU_ERROR_CODE);
order = get_order(size);
if (order < 10)
@ -426,7 +426,7 @@ static void dma_4u_unmap_page(struct device *dev, dma_addr_t bus_addr,
iommu_free_ctx(iommu, ctx);
spin_unlock_irqrestore(&iommu->lock, flags);
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, DMA_ERROR_CODE);
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, IOMMU_ERROR_CODE);
}
static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
@ -492,7 +492,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
&handle, (unsigned long)(-1), 0);
/* Handle failure */
if (unlikely(entry == DMA_ERROR_CODE)) {
if (unlikely(entry == IOMMU_ERROR_CODE)) {
if (printk_ratelimit())
printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
" npages %lx\n", iommu, paddr, npages);
@ -571,7 +571,7 @@ iommu_map_failed:
iopte_make_dummy(iommu, base + j);
iommu_tbl_range_free(&iommu->tbl, vaddr, npages,
DMA_ERROR_CODE);
IOMMU_ERROR_CODE);
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
@ -648,7 +648,7 @@ static void dma_4u_unmap_sg(struct device *dev, struct scatterlist *sglist,
iopte_make_dummy(iommu, base + i);
iommu_tbl_range_free(&iommu->tbl, dma_handle, npages,
DMA_ERROR_CODE);
IOMMU_ERROR_CODE);
sg = sg_next(sg);
}

2
arch/sparc/kernel/ldc.c
View File

@ -1953,7 +1953,7 @@ static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu,
entry = iommu_tbl_range_alloc(NULL, &iommu->iommu_map_table,
npages, NULL, (unsigned long)-1, 0);
if (unlikely(entry < 0))
if (unlikely(entry == IOMMU_ERROR_CODE))
return NULL;
return iommu->page_table + entry;

18
arch/sparc/kernel/pci_sun4v.c
View File

@ -159,7 +159,7 @@ static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
entry = iommu_tbl_range_alloc(dev, &iommu->tbl, npages, NULL,
(unsigned long)(-1), 0);
if (unlikely(entry == DMA_ERROR_CODE))
if (unlikely(entry == IOMMU_ERROR_CODE))
goto range_alloc_fail;
*dma_addrp = (iommu->tbl.table_map_base + (entry << IO_PAGE_SHIFT));
@ -187,7 +187,7 @@ static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
return ret;
iommu_map_fail:
iommu_tbl_range_free(&iommu->tbl, *dma_addrp, npages, DMA_ERROR_CODE);
iommu_tbl_range_free(&iommu->tbl, *dma_addrp, npages, IOMMU_ERROR_CODE);
range_alloc_fail:
free_pages(first_page, order);
@ -226,7 +226,7 @@ static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu,
devhandle = pbm->devhandle;
entry = ((dvma - iommu->tbl.table_map_base) >> IO_PAGE_SHIFT);
dma_4v_iommu_demap(&devhandle, entry, npages);
iommu_tbl_range_free(&iommu->tbl, dvma, npages, DMA_ERROR_CODE);
iommu_tbl_range_free(&iommu->tbl, dvma, npages, IOMMU_ERROR_CODE);
order = get_order(size);
if (order < 10)
free_pages((unsigned long)cpu, order);
@ -256,7 +256,7 @@ static dma_addr_t dma_4v_map_page(struct device *dev, struct page *page,
entry = iommu_tbl_range_alloc(dev, &iommu->tbl, npages, NULL,
(unsigned long)(-1), 0);
if (unlikely(entry == DMA_ERROR_CODE))
if (unlikely(entry == IOMMU_ERROR_CODE))
goto bad;
bus_addr = (iommu->tbl.table_map_base + (entry << IO_PAGE_SHIFT));
@ -288,7 +288,7 @@ bad:
return DMA_ERROR_CODE;
iommu_map_fail:
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, DMA_ERROR_CODE);
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, IOMMU_ERROR_CODE);
return DMA_ERROR_CODE;
}
@ -317,7 +317,7 @@ static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr,
bus_addr &= IO_PAGE_MASK;
entry = (bus_addr - iommu->tbl.table_map_base) >> IO_PAGE_SHIFT;
dma_4v_iommu_demap(&devhandle, entry, npages);
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, DMA_ERROR_CODE);
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, IOMMU_ERROR_CODE);
}
static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
@ -376,7 +376,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
&handle, (unsigned long)(-1), 0);
/* Handle failure */
if (unlikely(entry == DMA_ERROR_CODE)) {
if (unlikely(entry == IOMMU_ERROR_CODE)) {
if (printk_ratelimit())
printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
" npages %lx\n", iommu, paddr, npages);
@ -451,7 +451,7 @@ iommu_map_failed:
npages = iommu_num_pages(s->dma_address, s->dma_length,
IO_PAGE_SIZE);
iommu_tbl_range_free(&iommu->tbl, vaddr, npages,
DMA_ERROR_CODE);
IOMMU_ERROR_CODE);
/* XXX demap? XXX */
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
@ -496,7 +496,7 @@ static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
entry = ((dma_handle - tbl->table_map_base) >> shift);
dma_4v_iommu_demap(&devhandle, entry, npages);
iommu_tbl_range_free(&iommu->tbl, dma_handle, npages,
DMA_ERROR_CODE);
IOMMU_ERROR_CODE);
sg = sg_next(sg);
}

1
include/linux/iommu-common.h
View File

@ -7,6 +7,7 @@
#define IOMMU_POOL_HASHBITS 4
#define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS)
#define IOMMU_ERROR_CODE (~(unsigned long) 0)
struct iommu_pool {
unsigned long start;

10
lib/iommu-common.c
View File

@ -11,10 +11,6 @@
#include <linux/dma-mapping.h>
#include <linux/hash.h>
#ifndef DMA_ERROR_CODE
#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
#endif
static unsigned long iommu_large_alloc = 15;
static DEFINE_PER_CPU(unsigned int, iommu_hash_common);
@ -124,7 +120,7 @@ unsigned long iommu_tbl_range_alloc(struct device *dev,
/* Sanity check */
if (unlikely(npages == 0)) {
WARN_ON_ONCE(1);
return DMA_ERROR_CODE;
return IOMMU_ERROR_CODE;
}
if (largealloc) {
@ -207,7 +203,7 @@ unsigned long iommu_tbl_range_alloc(struct device *dev,
goto again;
} else {
/* give up */
n = DMA_ERROR_CODE;
n = IOMMU_ERROR_CODE;
goto bail;
}
}
@ -259,7 +255,7 @@ void iommu_tbl_range_free(struct iommu_map_table *iommu, u64 dma_addr,
unsigned long flags;
unsigned long shift = iommu->table_shift;
if (entry == DMA_ERROR_CODE) /* use default addr->entry mapping */
if (entry == IOMMU_ERROR_CODE) /* use default addr->entry mapping */
entry = (dma_addr - iommu->table_map_base) >> shift;
pool = get_pool(iommu, entry);