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[2003:ea:8f06:5500:e1db:b990:7e09:f1cf]) by smtp.googlemail.com with ESMTPSA id hb18sm1533707ejb.86.2021.01.06.09.52.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 Jan 2021 09:52:35 -0800 (PST) Subject: [PATCH v3 1/3] PCI: Disable parity checking if broken_parity is set From: Heiner Kallweit To: Bjorn Helgaas , Russell King - ARM Linux , Realtek linux nic maintainers , David Miller , Jakub Kicinski Cc: "linux-pci@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "netdev@vger.kernel.org" References: <992c800e-2e12-16b0-4845-6311b295d932@gmail.com> Message-ID: Date: Wed, 6 Jan 2021 18:50:22 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <992c800e-2e12-16b0-4845-6311b295d932@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org If we know that a device has broken parity checking, then disable it. This avoids quirks like in r8169 where on the first parity error interrupt parity checking will be disabled if broken_parity_status is set. Make pci_quirk_broken_parity() public so that it can be used by platform code, e.g. for Thecus N2100. Signed-off-by: Heiner Kallweit Reviewed-by: Leon Romanovsky --- drivers/pci/quirks.c | 17 +++++++++++------ include/linux/pci.h | 2 ++ 2 files changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 653660e3b..ab54e26b8 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -205,17 +205,22 @@ static void quirk_mmio_always_on(struct pci_dev *dev) DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_BRIDGE_HOST, 8, quirk_mmio_always_on); +void pci_quirk_broken_parity(struct pci_dev *dev) +{ + u16 cmd; + + dev->broken_parity_status = 1; /* This device gives false positives */ + pci_read_config_word(dev, PCI_COMMAND, &cmd); + pci_write_config_word(dev, PCI_COMMAND, cmd & ~PCI_COMMAND_PARITY); +} + /* * The Mellanox Tavor device gives false positive parity errors. Mark this * device with a broken_parity_status to allow PCI scanning code to "skip" * this now blacklisted device. */ -static void quirk_mellanox_tavor(struct pci_dev *dev) -{ - dev->broken_parity_status = 1; /* This device gives false positives */ -} -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MELLANOX, PCI_DEVICE_ID_MELLANOX_TAVOR, quirk_mellanox_tavor); -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MELLANOX, PCI_DEVICE_ID_MELLANOX_TAVOR_BRIDGE, quirk_mellanox_tavor); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MELLANOX, PCI_DEVICE_ID_MELLANOX_TAVOR, pci_quirk_broken_parity); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MELLANOX, PCI_DEVICE_ID_MELLANOX_TAVOR_BRIDGE, pci_quirk_broken_parity); /* * Deal with broken BIOSes that neglect to enable passive release, diff --git a/include/linux/pci.h b/include/linux/pci.h index b32126d26..161dcc474 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1916,6 +1916,8 @@ enum pci_fixup_pass { pci_fixup_suspend_late, /* pci_device_suspend_late() */ }; +void pci_quirk_broken_parity(struct pci_dev *dev); + #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS #define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \ class_shift, hook) \ -- 2.30.0