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sparc/PCI: Support arbitrary host bridge address offset

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Add support for arbitrary bus address offset.  Previously we ignored the
child (PCI) address in the "ranges" property and assumed it was always
zero.  That means every host bridge window mapped to PCI bus address zero,
e.g.,

  pci_bus 0000:00: root bus resource [mem 0x2000000000000-0x200007fffffff] (bus address [0x00000000-0x7fffffff])

But some systems have host bridge windows with non-zero child addresses, so
parse the child address and compute the offset between the parent (CPU) and
child (PCI) addresses.  This allows windows like these:

  /pci@305: PCI MEM [mem 0x2000000100000-0x200007effffff] offset 2000000000000
  pci_sun4v f02ae7f8: PCI host bridge to bus 0000:00
  pci_bus 0000:00: root bus resource [mem 0x2000000100000-0x200007effffff] (bus address [0x00100000-0x7effffff])

[bhelgaas: changelog]
Tested-by: Khalid Aziz <khalid.aziz@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: sparclinux@vger.kernel.org
This commit is contained in:
Yinghai Lu
2017-04-20 22:04:48 -07:00
committed by Bjorn Helgaas
parent 7928b2cbe5
commit b4a304489e
3 changed files with 33 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/sparc/kernel/pci_impl.h
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@@ -100,6 +100,10 @@ struct pci_pbm_info {
struct resource mem_space;
struct resource mem64_space;
struct resource busn;
/* offset */
resource_size_t io_offset;
resource_size_t mem_offset;
resource_size_t mem64_offset;
/* Base of PCI Config space, can be per-PBM or shared. */
unsigned long config_space;