x86/PCI: Disable exclusion of E820 reserved addresses in some cases

x86/PCI: Disable exclusion of E820 reserved addresses in some cases

Some fw has a bug where the PCI bridge window returned by the ACPI
resources partly overlaps with some other address range, causing issues.
To workaround this Linux excludes E820 reserved addresses when allocating
addresses from the PCI bridge window. 2 known examples of such fw bugs are:

 1. The returned window contains addresses which map to system RAM,
    see commit 4dc2287c1805 ("x86: avoid E820 regions when allocating
    address space").

 2. The Lenovo X1 carbon gen 2 BIOS has an overlap between an EFI/E820
    reserved range and the ACPI provided PCI bridge window:

 efi: mem46: [MMIO] range=[0x00000000dfa00000-0x00000000dfa0ffff] (0MB)
 BIOS-e820: [mem 0x00000000dceff000-0x00000000dfa0ffff] reserved
 pci_bus 0000:00: root bus resource [mem 0xdfa00000-0xfebfffff window]

If Linux assigns the overlapping 0xdfa00000-0xdfa0ffff range to a PCI BAR
then the system fails to resume after a suspend.

Recently (2019) some systems have shown-up with EFI memmap MMIO entries
covering the entire ACPI provided PCI bridge window. These memmap entries
get converted into e820_table entries, causing all attempts to assign
memory to PCI BARs which have not been setup by the BIOS to fail.
For example see these dmesg snippets from a Lenovo IdeaPad 3 15IIL 81WE:

 efi: mem63: [MMIO] range=[0x0000000065400000-0x00000000cfffffff] (1708MB)
 BIOS-e820: [mem 0x000000004bc50000-0x00000000cfffffff] reserved
 pci_bus 0000:00: root bus resource [mem 0x65400000-0xbfffffff window]
 pci 0000:00:15.0: BAR 0: no space for [mem size 0x00001000 64bit]
 pci 0000:00:15.0: BAR 0: failed to assign [mem size 0x00001000 64bit]

To fix this, check if the ACPI provided PCI bridge window is fully
contained within in EFI memmap MMIO region and in that case disable
the "exclude E820 reserved addresses" workaround, fixing the problem
of not being able to find free space for unassigned BARs.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=206459
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1868899
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1871793
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=2029207
BugLink: https://bugs.launchpad.net/bugs/1878279
BugLink: https://bugs.launchpad.net/bugs/1931715
BugLink: https://bugs.launchpad.net/bugs/1932069
BugLink: https://bugs.launchpad.net/bugs/1921649
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>