[Skiboot] [PATCH RESEND v3 0/5] core/pci: Track changes of topology by an OS
s.miroshnichenko at yadro.com
Fri Oct 25 05:02:54 AEDT 2019
An OS may re-enumerate the PCIe tree during boot and after hot-plugging a
bridge, but this leads to de-sync of the cached and actual BDF addresses.
Track the changes in bus numbering and update the cached topology (a tree
consisting of struct pci_device nodes) correspondingly, including PEs.
Append the cached topology when reading a config space reveals a hot-added
device, with no need for an explicit OPAL call for that.
Tested on POWER8 PowerNV+PHB3 ppc64le (Vesnin platform) and Linux kernel
Changes since v2:
- Removed handling VFs, as skiboot doesn't track them anymore;
- Use macros for accessing PCI BDF bits.
Changes since v1:
- Fixed comparing 32-bit constant with uint16_t and uint8_t.
Sergey Miroshnichenko (5):
core/pci: Add functions to find accessible devices by bdfn
core/pci: Make the pci_scan_one() function public
core/pci: Create the struct pci_device nodes automatically
core/pci: Hook up the writes to PRIMARY/SECONDARY/SUBORDINATE_BUS
core/pci: Indicate support for PCI re-enumeration
core/pci-opal.c | 101 +++++++++++++++++++++++++++++++++++++++++++++---
core/pci.c | 88 ++++++++++++++++++++++++++++++++++++++++-
include/pci.h | 4 ++
3 files changed, 186 insertions(+), 7 deletions(-)
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