tree 1017880cbee16369c9012559b420b3b146f41408
parent 6b74f68fcf06a3de6f5ac49f39e60a42bd3e78dc
author Alexandru Elisei <alexandru.elisei@arm.com> 1626195990 +0100
committer Will Deacon <will@kernel.org> 1626447754 +0100

arm/arm64: Add PCI Express 1.1 support

PCI Express comes with an extended addressing scheme, which directly
translated into a bigger device configuration space (256->4096 bytes)
and bigger PCI configuration space (16->256 MB), as well as mandatory
capabilities (power management [1] and PCI Express capability [2]).

However, our virtio PCI implementation implements version 0.9 of the
protocol and it still uses transitional PCI device ID's, so we have
opted to omit the mandatory PCI Express capabilities. For VFIO, the power
management and PCI Express capability are left for a subsequent patch.

[1] PCI Express Base Specification Revision 1.1, section 7.6
[2] PCI Express Base Specification Revision 1.1, section 7.8

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Link: https://lore.kernel.org/r/20210713170631.155595-4-alexandru.elisei@arm.com
Signed-off-by: Will Deacon <will@kernel.org>