This patch series implements second rootbus support inside Intel VMD module.
Current implementation allows VMD to take ownership of devices only on first
bus (Rootbus0). Starting from Intel Arrow Lake, VMD exposes second bus
(Rootbus1) to allow VMD to own devices on this bus as well. VMD MMIO BARs
(CFGBAR. MEMBAR1 and MEMBAR2) are now shared between Rootbus0 and Rootbus1.
Reconfiguration of 3 MMIO BARs is required by resizing current MMIO BARs ranges.
It allows to find/register Rootbus1 and discovers devices behind it.
Patches 1 to 6 introduce code refactoring without functional changes.
Patch 7 implements VMD Rootbus1 and patch 8 provides workaround for rootbus
number hardwired to fixed non-zero value. Patch 8 is necessary for correct
enumeration attached devices behind Rottbus1. Without it user cannot access
those devices.
Changes from v1:
- splitting series into more commits, requested by Bjorn
- adding helper functions, suggested by Bjorn
- minor typos and unclear wording updated, suggested by Bjorn
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Lukas Wunner <lukas@xxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
Suggested-by: Nirmal Patel <nirmal.patel@xxxxxxxxxxxxxxx>
Reviewed-by: Mariusz Tkaczyk <mariusz.tkaczyk@xxxxxxxxxxxxxxx>
Signed-off-by: Szymon Durawa <szymon.durawa@xxxxxxxxxxxxxxx>
Szymon Durawa (8):
PCI: vmd: Add vmd_bus_enumeration()
PCI: vmd: Add vmd_configure_cfgbar()
PCI: vmd: Add vmd_configure_membar() and
vmd_configure_membar1_membar2()
PCI: vmd: Add vmd_create_bus()
PCI: vmd: Replace hardcoded values with enum and defines
PCI: vmd: Convert bus and busn_start to an array
PCI: vmd: Add support for second rootbus under VMD
PCI: vmd: Add workaround for rootbus number hardwired to fixed
non-zero value
drivers/pci/controller/vmd.c | 467 ++++++++++++++++++++++++++---------
1 file changed, 357 insertions(+), 110 deletions(-)
mode change 100644 => 100755 drivers/pci/controller/vmd.c
--
2.39.3
