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author | Yinghai Lu <yinghai@kernel.org> | 2015-05-27 17:23:51 -0700 |
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committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-05-29 17:21:45 -0500 |
commit | 3a9ad0b4fdcd57f775d3615004c8c64c021a9e7d (patch) | |
tree | ce73733e771a149737b0c5dcf3c32f10e7d3fb31 /drivers/pci/pci.c | |
parent | 5ebe6afaf0057ac3eaeb98defd5456894b446d22 (diff) | |
download | linux-stable-3a9ad0b4fdcd57f775d3615004c8c64c021a9e7d.tar.gz linux-stable-3a9ad0b4fdcd57f775d3615004c8c64c021a9e7d.tar.bz2 linux-stable-3a9ad0b4fdcd57f775d3615004c8c64c021a9e7d.zip |
PCI: Add pci_bus_addr_t
David Ahern reported that d63e2e1f3df9 ("sparc/PCI: Clip bridge windows
to fit in upstream windows") fails to boot on sparc/T5-8:
pci 0000:06:00.0: reg 0x184: can't handle BAR above 4GB (bus address 0x110204000)
The problem is that sparc64 assumed that dma_addr_t only needed to hold DMA
addresses, i.e., bus addresses returned via the DMA API (dma_map_single(),
etc.), while the PCI core assumed dma_addr_t could hold *any* bus address,
including raw BAR values. On sparc64, all DMA addresses fit in 32 bits, so
dma_addr_t is a 32-bit type. However, BAR values can be 64 bits wide, so
they don't fit in a dma_addr_t. d63e2e1f3df9 added new checking that
tripped over this mismatch.
Add pci_bus_addr_t, which is wide enough to hold any PCI bus address,
including both raw BAR values and DMA addresses. This will be 64 bits
on 64-bit platforms and on platforms with a 64-bit dma_addr_t. Then
dma_addr_t only needs to be wide enough to hold addresses from the DMA API.
[bhelgaas: changelog, bugzilla, Kconfig to ensure pci_bus_addr_t is at
least as wide as dma_addr_t, documentation]
Fixes: d63e2e1f3df9 ("sparc/PCI: Clip bridge windows to fit in upstream windows")
Fixes: 23b13bc76f35 ("PCI: Fail safely if we can't handle BARs larger than 4GB")
Link: http://lkml.kernel.org/r/CAE9FiQU1gJY1LYrxs+ma5LCTEEe4xmtjRG0aXJ9K_Tsu+m9Wuw@mail.gmail.com
Link: http://lkml.kernel.org/r/1427857069-6789-1-git-send-email-yinghai@kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=96231
Reported-by: David Ahern <david.ahern@oracle.com>
Tested-by: David Ahern <david.ahern@oracle.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: David S. Miller <davem@davemloft.net>
CC: stable@vger.kernel.org # v3.19+
Diffstat (limited to 'drivers/pci/pci.c')
0 files changed, 0 insertions, 0 deletions