Hi Bjorn, On 2024/12/4 1:48 PM, Mika Westerberg wrote:
External email: Use caution opening links or attachments On Wed, Dec 04, 2024 at 10:24:57AM +0800, Kai-Heng Feng wrote:Commit 7180c1d08639 ("PCI: Distribute available resources for root buses, too") breaks BAR assignment on some devcies: [ 10.021193] pci 0006:03:00.0: BAR 0 [mem 0x6300c0000000-0x6300c1ffffff 64bit pref]: assigned [ 10.029880] pci 0006:03:00.1: BAR 0 [mem 0x6300c2000000-0x6300c3ffffff 64bit pref]: assigned [ 10.038561] pci 0006:03:00.2: BAR 0 [mem size 0x00800000 64bit pref]: can't assign; no space [ 10.047191] pci 0006:03:00.2: BAR 0 [mem size 0x00800000 64bit pref]: failed to assign [ 10.055285] pci 0006:03:00.0: VF BAR 0 [mem size 0x02000000 64bit pref]: can't assign; no space [ 10.064180] pci 0006:03:00.0: VF BAR 0 [mem size 0x02000000 64bit pref]: failed to assign [ 10.072543] pci 0006:03:00.1: VF BAR 0 [mem size 0x02000000 64bit pref]: can't assign; no space [ 10.081437] pci 0006:03:00.1: VF BAR 0 [mem size 0x02000000 64bit pref]: failed to assign The apertures of domain 0006 before the commit: 6300c0000000-63ffffffffff : PCI Bus 0006:00 6300c0000000-6300c9ffffff : PCI Bus 0006:01 6300c0000000-6300c9ffffff : PCI Bus 0006:02 6300c0000000-6300c8ffffff : PCI Bus 0006:03 6300c0000000-6300c1ffffff : 0006:03:00.0 6300c0000000-6300c1ffffff : mlx5_core 6300c2000000-6300c3ffffff : 0006:03:00.1 6300c2000000-6300c3ffffff : mlx5_core 6300c4000000-6300c47fffff : 0006:03:00.2 6300c4800000-6300c67fffff : 0006:03:00.0 6300c6800000-6300c87fffff : 0006:03:00.1 6300c9000000-6300c9bfffff : PCI Bus 0006:04 6300c9000000-6300c9bfffff : PCI Bus 0006:05 6300c9000000-6300c91fffff : PCI Bus 0006:06 6300c9200000-6300c93fffff : PCI Bus 0006:07 6300c9400000-6300c95fffff : PCI Bus 0006:08 6300c9600000-6300c97fffff : PCI Bus 0006:09 After the commit: 6300c0000000-63ffffffffff : PCI Bus 0006:00 6300c0000000-6300c9ffffff : PCI Bus 0006:01 6300c0000000-6300c9ffffff : PCI Bus 0006:02 6300c0000000-6300c43fffff : PCI Bus 0006:03 6300c0000000-6300c1ffffff : 0006:03:00.0 6300c0000000-6300c1ffffff : mlx5_core 6300c2000000-6300c3ffffff : 0006:03:00.1 6300c2000000-6300c3ffffff : mlx5_core 6300c4400000-6300c4dfffff : PCI Bus 0006:04 6300c4400000-6300c4dfffff : PCI Bus 0006:05 6300c4400000-6300c45fffff : PCI Bus 0006:06 6300c4600000-6300c47fffff : PCI Bus 0006:07 6300c4800000-6300c49fffff : PCI Bus 0006:08 6300c4a00000-6300c4bfffff : PCI Bus 0006:09 We can see that the window of 0006:03 gets shrunken too much and 0006:04 eats away the window for 0006:03:00.2. The offending commit distributes the upstream bridge's resources multiple times to every downstream bridges, hence makes the aperture smaller than desired because calculation of io_per_b, mmio_per_b and mmio_pref_per_b becomes incorrect. Instead, distributing downstream bridges' own resources to resolve the issue. Link: https://bugzilla.kernel.org/show_bug.cgi?id=219540 Cc: Carol Soto <csoto@xxxxxxxxxx> Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Cc: Chris Chiu <chris.chiu@xxxxxxxxxxxxx> Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Is it possible to pickup this up in 6.13 window? Kai-Heng
