linux-kernel - [PATCH 0/3] PCI/ASPM: Fix L1SS issues

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Date:   Tue,  4 Oct 2022 21:58:06 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     Vidya Sagar <vidyas@...dia.com>,
        "Saheed O . Bolarinwa" <refactormyself@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rajat Jain <rajatja@...gle.com>,
        "Kenneth R . Crudup" <kenny@...ix.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Abhishek Sahu <abhsahu@...dia.com>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Krishna Thota <kthota@...dia.com>,
        Manikanta Maddireddy <mmaddireddy@...dia.com>,
        Vidya Sagar <sagar.tv@...il.com>, sagupta@...dia.com,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 0/3] PCI/ASPM: Fix L1SS issues

From: Bjorn Helgaas <bhelgaas@...gle.com>

This is really late, but I think we have two significant issues with L1SS:

  1) pcie_aspm_cap_init() reads from the L1SS capability even when it
  doesn't exist, so it reads PCI_COMMAND and PCI_STATUS instead and treats
  those as an L1SS Capability value.

  2) encode_l12_threshold() encodes LTR_L1.2_THRESHOLD as smaller than
  requested, so ports may enter L1.2 when they should not.

These patches are intended to fix both issues.

Bjorn Helgaas (3):
  PCI/ASPM: Factor out L1 PM Substates configuration
  PCI/ASPM: Ignore L1 PM Substates if device lacks capability
  PCI/ASPM: Correct LTR_L1.2_THRESHOLD computation

 drivers/pci/pcie/aspm.c | 155 +++++++++++++++++++++++-----------------
 1 file changed, 90 insertions(+), 65 deletions(-)

-- 
2.25.1