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authorDavid S. Miller <davem@davemloft.net>2006-06-22 03:01:56 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-24 02:15:21 -0400
commitc2a5a46be4a1c682e18e29e67785126b7610b14d (patch)
treeb9101fa7547c9c5d86ff550e6398a8cf7c2f283a /include/asm-sparc64
parent486ad10a7e1b2bb61ea9e48c4d9510f50cd74fc5 (diff)
[SPARC64]: Fix for Niagara memory corruption.
On some sun4v systems, after netboot the ethernet controller and it's DMA mappings can be left active. The net result is that the kernel can end up using memory the ethernet controller will continue to DMA into, resulting in corruption. To deal with this, we are more careful about importing IOMMU translations which OBP has left in the IO-TLB. If the mapping maps into an area the firmware claimed was free and available memory for the kernel to use, we demap instead of import that IOMMU entry. This is going to cause the network chip to take a PCI master abort on the next DMA it attempts, if it has been left going like this. All tests show that this is handled properly by the PCI layer and the e1000 drivers. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64')
-rw-r--r--include/asm-sparc64/pgtable.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h
index 4e218814bb3c..03f5bc9b6bec 100644
--- a/include/asm-sparc64/pgtable.h
+++ b/include/asm-sparc64/pgtable.h
@@ -756,6 +756,8 @@ extern unsigned long *sparc64_valid_addr_bitmap;
756#define kern_addr_valid(addr) \ 756#define kern_addr_valid(addr) \
757 (test_bit(__pa((unsigned long)(addr))>>22, sparc64_valid_addr_bitmap)) 757 (test_bit(__pa((unsigned long)(addr))>>22, sparc64_valid_addr_bitmap))
758 758
759extern int page_in_phys_avail(unsigned long paddr);
760
759extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, 761extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
760 unsigned long pfn, 762 unsigned long pfn,
761 unsigned long size, pgprot_t prot); 763 unsigned long size, pgprot_t prot);