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| author | Max Dmitrichenko <dmitrmax@gmail.com> | 2008-11-02 00:34:10 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-11-02 00:34:10 -0700 |
| commit | 5769907ade8dda7002b304c03ef9e4ee5c1e0821 (patch) | |
| tree | 620a1fd9938abb10abfb0dde236a6e29026ab4ab | |
| parent | a1995a6599044076e2e13512ffbcecc49865e63e (diff) | |
| download | linux-5769907ade8dda7002b304c03ef9e4ee5c1e0821.tar.gz linux-5769907ade8dda7002b304c03ef9e4ee5c1e0821.tar.bz2 linux-5769907ade8dda7002b304c03ef9e4ee5c1e0821.zip | |
sparc64: Fix PCI resource mapping on sparc64
There is a problem discovered in recent versions of ATI Mach64 driver
in X.org on sparc64 architecture. In short, the driver fails to mmap
MMIO aperture (PCI resource #2).
I've found that kernel's __pci_mmap_make_offset() returns EINVAL. It
checks whether user attempts to mmap more than the resource length,
which is 0x1000 bytes in our case. But PAGE_SIZE on SPARC64 is 0x2000
and this is what actually is being mmaped. So __pci_mmap_make_offset()
failed for this PCI resource.
Signed-off-by: Max Dmitrichenko <dmitrmax@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | arch/sparc64/kernel/pci.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/pci.c b/arch/sparc64/kernel/pci.c index 242ac1ccae7d..bdb7c0a6d83d 100644 --- a/arch/sparc64/kernel/pci.c +++ b/arch/sparc64/kernel/pci.c @@ -889,6 +889,7 @@ static int __pci_mmap_make_offset(struct pci_dev *pdev, for (i = 0; i <= PCI_ROM_RESOURCE; i++) { struct resource *rp = &pdev->resource[i]; + resource_size_t aligned_end; /* Active? */ if (!rp->flags) @@ -906,8 +907,15 @@ static int __pci_mmap_make_offset(struct pci_dev *pdev, continue; } + /* Align the resource end to the next page address. + * PAGE_SIZE intentionally added instead of (PAGE_SIZE - 1), + * because actually we need the address of the next byte + * after rp->end. + */ + aligned_end = (rp->end + PAGE_SIZE) & PAGE_MASK; + if ((rp->start <= user_paddr) && - (user_paddr + user_size) <= (rp->end + 1UL)) + (user_paddr + user_size) <= aligned_end) break; } |