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[PATCH] x86-64: robustify bad_dma_address handling

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- set bad_dma_address explicitly to 0x0
- reserve 32 pages from bad_dma_address and up
- WARN_ON() a driver feeding us bad_dma_address

Thanks to Leo Duran <leo.duran@amd.com> for the suggestion.

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Leo Duran <leo.duran@amd.com>
Cc: Job Mason <jdmason@kudzu.us>
This commit is contained in:
Muli Ben-Yehuda 2007-02-13 13:26:24 +01:00 committed by Andi Kleen
parent 2fa8a050a0
commit 310adfdd91
1 changed files with 15 additions and 2 deletions
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17
arch/x86_64/kernel/pci-calgary.c
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@ -138,6 +138,8 @@ static const unsigned long phb_debug_offsets[] = {
#define PHB_DEBUG_STUFF_OFFSET 0x0020
#define EMERGENCY_PAGES 32 /* = 128KB */
unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
static int translate_empty_slots __read_mostly = 0;
static int calgary_detected __read_mostly = 0;
@ -296,6 +298,16 @@ static void __iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
{
unsigned long entry;
unsigned long badbit;
unsigned long badend;
/* were we called with bad_dma_address? */
badend = bad_dma_address + (EMERGENCY_PAGES * PAGE_SIZE);
if (unlikely((dma_addr >= bad_dma_address) && (dma_addr < badend))) {
printk(KERN_ERR "Calgary: driver tried unmapping bad DMA "
"address 0x%Lx\n", dma_addr);
WARN_ON(1);
return;
}
entry = dma_addr >> PAGE_SHIFT;
@ -656,8 +668,8 @@ static void __init calgary_reserve_regions(struct pci_dev *dev)
u64 start;
struct iommu_table *tbl = dev->sysdata;
/* reserve bad_dma_address in case it's a legal address */
iommu_range_reserve(tbl, bad_dma_address, 1);
/* reserve EMERGENCY_PAGES from bad_dma_address and up */
iommu_range_reserve(tbl, bad_dma_address, EMERGENCY_PAGES);
/* avoid the BIOS/VGA first 640KB-1MB region */
start = (640 * 1024);
@ -1176,6 +1188,7 @@ int __init calgary_iommu_init(void)
}
force_iommu = 1;
bad_dma_address = 0x0;
dma_ops = &calgary_dma_ops;
return 0;