tree 9991c379b34f66d7478f37986f4ee5fba5a673ec
parent 13313d403ac27761463732ba9cb883b93f56aa53
author Tinghao Zhang <tinghao.zhang@intel.corp-partner.google.com> 1646390093 +0800
committer Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> 1655419247 +0000

devices: pcie: pcie_bridge: refactor configure_bridge_window()

To support pcie switch, we need a correct way to calculate pci
bridge window. This patch is refactoring configure_bridge_window()
for preparation.

This patch does 3 things:
1. The original code does not calculate bridge window correctly.
For the following bar_ranges, the old version would fail:
[[0xd0400000, 0x1000, false], [0xd0000000, 0x100000, false],
[0xd0100000, 0x1000, false]], [0xd0200000, 0x200000, false]]
This patch fixes this bug.

2. We need to round bridge window base down to 1MB aligned, round
window size up to 1MB aligned.

3. Since bridge window are also bar ranges, we need to return
the configured bridge window so that parent bridge can use it.

BUG=b:199986018
TEST=./tools/presubmit

Change-Id: Iff26fdd7e500671688897652ac16aff792882707
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3503102
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>