mbox series

[v3,0/8] VMD add second rootbus support

Message ID 20241122085215.424736-1-szymon.durawa@linux.intel.com (mailing list archive)
Headers show
Series VMD add second rootbus support | expand

Message

Szymon Durawa Nov. 22, 2024, 8:52 a.m. UTC 
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 VMD Rootbus1 and discovers devices or root
ports under it.

Patches 1 to 6 introduce code refactoring without functional changes.
Patch 7 implements VMD Rootbus1 support and patch 8 provides workaround for
rootbus number hardwired to fixed non-zero value. Patch 8 is necessary for
correct enumeration attached devices under VMD Rootbus1. Without it user cannot
access those devices as they are not visible in the system, only drives under
VMD Rootbus0 are available to the user.

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

Changes from v2:
- wording update in commit logs, suggested by Bjorn

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: linux-pci@vger.kernel.org
Suggested-by: Nirmal Patel <nirmal.patel@linux.intel.com>
Reviewed-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Signed-off-by: Szymon Durawa <szymon.durawa@linux.intel.com>

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 bus number hardwired to fixed non-zero
    value

 drivers/pci/controller/vmd.c | 470 +++++++++++++++++++++++++++--------
 1 file changed, 360 insertions(+), 110 deletions(-)
 mode change 100644 => 100755 drivers/pci/controller/vmd.c