PCI: Stop over-estimating bridge window size

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[ Upstream commit 3958bf16e2 ]

New way to calculate the bridge window head alignment produces tight-fit,
that is, it does not leave any gaps between the resources.  Similarly,
relaxed tail alignment does not leave extra tail room.

Start to use bridge window calculation that does not over-estimate the size
of the required window.

pbus_upstream_space_available() can be removed.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Malte Schröder <malte+lkml@tnxip.de>
Link: https://patch.msgid.link/20251219174036.16738-4-ilpo.jarvinen@linux.intel.com
Stable-dep-of: f909e3ee3e ("PCI: Remove old_size limit from bridge window sizing")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Ilpo Järvinen 2025-12-19 19:40:16 +02:00 • committed by Greg Kroah-Hartman

parent d5de3e34dc

commit b855d99486

1 changed files with 5 additions and 92 deletions

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drivers/pci/setup-bus.c

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