libpci currently provides only access to bits [23:8] of class id via dev->device_class member. Remaining bits [7:0] of class id can be only accessed via reading config space. lspci in some places reads class id from dev->device_class and on some places from config space because it does not have access to all class bits. For some broken devices kernel reports different class id via sysfs as what is stored in device config space. Value reported by sysfs should be the correct one. lspci has -b option (Bus-centric view) to choose if information from kernel or from config space should be showed. But this option is not respected on all places because of missing bits. Same applies for vendor+device ids, subsystem ids and revision id. Export all these information from sysfs via libpci API use it in lspci. With this change lspci should now respect -b option for all these information. With this change are in libpci and lspci also available subsystem ids for PCI-to-PCI bridges. This patch series is based on top of another patch series: https://lore.kernel.org/linux-pci/20211220155448.1233-3-pali@xxxxxxxxxx/ Pali Rohár (5): libpci: Add new options for pci_fill_info: PROGIF, REVID and SUBSYS libpci: generic: Implement PROGIF, REVID and SUBSYS support libpci: generic: Implement SUBSYS also for PCI_HEADER_TYPE_BRIDGE libpci: sysfs: Implement PROGIF, REVID and SUBSYS support lspci: Retrieve prog if, subsystem ids and revision id via libpci lib/generic.c | 55 +++++++++++++++++++++++++++++++++++++++- lib/pci.h | 6 +++++ lib/sysfs.c | 39 +++++++++++++++++++++++++--- ls-kernel.c | 8 +++--- lspci.c | 70 ++++++++++++++++++--------------------------------- lspci.h | 2 -- 6 files changed, 123 insertions(+), 57 deletions(-) -- 2.20.1
