meson64: move the pending MPS series from v7 to v9 - #10743
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe archived Meson PCIe patch series moves Root Port MPS handling into PCI core logic. It removes Meson-specific MPS programming, keeps MRRS configuration, and updates archive patch files for meson64 6.18, 7.2, and 7.3. ChangesMeson PCIe MPS handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant PCI enumeration
participant pci_configure_mps
participant Root Port
participant pci_walk_bus
PCI enumeration->>pci_configure_mps: configure device MPS
pci_configure_mps->>Root Port: set maximum MPS during host probing
pci_configure_mps->>pci_walk_bus: reduce MPS across the subordinate hierarchy
pci_walk_bus-->>PCI enumeration: return configured hierarchy
Merge Risk: ⚪ Minimal · up to The updated archive series consistently centralizes PCIe MPS handling while retaining Meson MRRS configuration. No actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In
`@patch/kernel/archive/meson64-6.18/x-PATCH-v9-3-3-PCI-dwc-Remove-redundant-MPS-configuration.patch`:
- Around line 93-94: Update the MPS-reduction flow around pcie_reduce_mps and
pci_walk_bus so it only runs during initial enumeration, or otherwise quiesces
the entire PCIe hierarchy before reducing the Root Port and subordinate devices.
Preserve the reduction order while preventing active, driver-bound sibling
functions from transmitting with stale larger MPS values, and apply the same
correction to the 7.2 and 7.3 patch copies.
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patch/kernel/archive/meson64-6.18/x-PATCH-v7-2-2-PCI-dwc-Remove-redundant-MPS-configuration.patchpatch/kernel/archive/meson64-6.18/x-PATCH-v9-3-3-PCI-dwc-Remove-redundant-MPS-configuration.patchpatch/kernel/archive/meson64-7.2/x-PATCH-v7-2-2-PCI-dwc-Remove-redundant-MPS-configuration.patchpatch/kernel/archive/meson64-7.2/x-PATCH-v9-3-3-PCI-dwc-Remove-redundant-MPS-configuration.patchpatch/kernel/archive/meson64-7.3/x-PATCH-v7-2-2-PCI-dwc-Remove-redundant-MPS-configuration.patchpatch/kernel/archive/meson64-7.3/x-PATCH-v9-3-3-PCI-dwc-Remove-redundant-MPS-configuration.patch
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- patch/kernel/archive/meson64-6.18/x-PATCH-v7-2-2-PCI-dwc-Remove-redundant-MPS-configuration.patch
- patch/kernel/archive/meson64-7.2/x-PATCH-v7-2-2-PCI-dwc-Remove-redundant-MPS-configuration.patch
- patch/kernel/archive/meson64-7.3/x-PATCH-v7-2-2-PCI-dwc-Remove-redundant-MPS-configuration.patch
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The tree carries Hans Zhang's "PCI: Configure Root Port MPS during host probing" as v7, two patches, since 9877a95 in December 2025. The series is still not upstream; v9 was posted on 2026-09-16 and fixes a hole the v7 version leaves open. v7 raises a Root Port's MPS to its DevCap value before enumeration, and pci_configure_mps() lowers it again only when the endpoint sits directly below a Root Port. Behind a Switch the Switch ports have already inherited the larger MPS, the reduction is skipped, and an endpoint with a smaller MPSS keeps the oversized setting - a Malformed TLP waiting to happen. The new first patch walks the subordinate bus and reduces the whole hierarchy instead. The second one now checks what pcie_set_mps() returned, and the third drops the same meson_set_max_payload() as before, plus the dead macros it leaves behind. Applies to meson64-6.18, -7.2 and -7.3 (no MPS patch in -6.12). On ODROID-HC4 this changes nothing measurable, which is the point: no Switch, the ASM1061 hangs directly off the Root Port, and both ends end up at MPS 256 with either version - the endpoint advertises MPSS 512, the kernel matches it down to the Root Port's 256. Checked with 32 GiB written and read back through fio with crc32c verification across two SSDs behind the port: no errors, Root Port AER counters at zero. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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✅ This PR has been reviewed and approved — all set for merge! |
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The tree carries Hans Zhang's "PCI: Configure Root Port MPS during host
probing" as v7, two patches, since 9877a95 in December 2025. The series
is still not upstream; v9 was posted on 2026-09-16 and fixes a hole the v7
version leaves open.
v7 raises a Root Port's MPS to its DevCap value before enumeration, and
pci_configure_mps()lowers it again only when the endpoint sits directlybelow a Root Port. Behind a Switch the Switch ports have already inherited
the larger MPS, the reduction is skipped, and an endpoint with a smaller
MPSS keeps the oversized setting — a Malformed TLP waiting to happen. The
new first patch walks the subordinate bus and reduces the whole hierarchy
instead. The second one now checks what
pcie_set_mps()returned, and thethird drops the same
meson_set_max_payload()as before, plus the deadmacros it leaves behind.
Applies to meson64-6.18, -7.2 and -7.3 (no MPS patch in -6.12). Patching
verified for 7.2 (70/70 applied), including alongside the
pci-meson.cchanges from #10740, which touch the same file.
On ODROID-HC4 this changes nothing measurable, which is the point: no
Switch, the ASM1061 hangs directly off the Root Port, and both ends end up
at MPS 256 with either version — the endpoint advertises MPSS 512, the
kernel matches it down to the Root Port's 256. Checked with 32 GiB written
and read back through fio with crc32c verification across two SSDs behind
the port: no errors, Root Port AER counters at zero.
Upstream thread: https://lore.kernel.org/linux-rockchip/20260916153907.60344-1-18255117159@163.com/
Summary by CodeRabbit
Bug Fixes
Refactor