On 10/05/2015 03:54 PM, Sean O. Stalley wrote:
On Fri, Oct 02, 2015 at 03:37:56PM -0700, David Daney wrote:From: David Daney <david.daney@xxxxxxxxxx> PCI bridges may have their properties be specified via EA entries. Extend the EA parser to extract the bridge resources, and modify pci_read_bridge_{io,mmio,mmio_pref}() to use resources previously obtained via EA. Save the offset to the EA capability in struct pci_dev, and use it to easily find the EA bridge subordinate and secondary bus numbers. When assigning the bridge resources a couple of changes are required so that the EA obtained IORESOURCE_PCI_FIXED are not resized, and correctly linked into the resource tree. 1) In pbus_size_mem() do not attempt to resize the bridge resources if they are marked as IORESOURCE_PCI_FIXED. 2) In pci_bus_alloc_from_region()for IORESOURCE_PCI_FIXED resources, just try to request the resource as is, without attempting to resize it. Signed-off-by: David Daney <david.daney@xxxxxxxxxx> --- drivers/pci/bus.c | 7 +++++++ drivers/pci/pci.c | 13 +++++++++++++ drivers/pci/probe.c | 31 +++++++++++++++++++++++++++++-- drivers/pci/setup-bus.c | 3 +++ include/linux/pci.h | 1 + 5 files changed, 53 insertions(+), 2 deletions(-) @@ -801,8 +813,23 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); primary = buses & 0xFF; - secondary = (buses >> 8) & 0xFF; - subordinate = (buses >> 16) & 0xFF; + if (dev->ea_cap) { + u32 dw1; + + pci_read_config_dword(dev, dev->ea_cap + 4, &dw1); + if (dw1 & 0xFF) + secondary = dw1 & 0xFF; + else + secondary = (buses >> 8) & 0xFF; + + if ((dw1 >> 8) & 0xFF) + subordinate = (dw1 >> 8) & 0xFF; + else + subordinate = (buses >> 16) & 0xFF; + } else { + secondary = (buses >> 8) & 0xFF; + subordinate = (buses >> 16) & 0xFF; + }We can refactor this to make it cleaner/more compact. from V3 review: secondary = (buses >> 8) & 0xFF; subordinate = (buses >> 16) & 0xFF; if (dev->ea_cap) { u32 sdw; pci_read_config_dword(dev, dev->ea_cap + 4, &sdw); if (sdw & 0xFF) secondary = sdw & 0xFF; sdw >>= 8; if (sdw & 0xFF) subordinate = sdw & 0xFF; }
Yes, that is cleaner. I think I didn't read the comments on v3 closely enough. I will switch to doing it this way.
Thanks, David Daney
-Sean
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