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SubjectRe: [PATCH v11 03/16] PCI/RCEC: Bind RCEC devices to the Root Port driver
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On 11/17/20 11:19 AM, Sean V Kelley wrote:
> From: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
>
> If a Root Complex Integrated Endpoint (RCiEP) is implemented, it may signal
> errors through a Root Complex Event Collector (RCEC). Each RCiEP must be
> associated with no more than one RCEC.
>
> For an RCEC (which is technically not a Bridge), error messages "received"
> from associated RCiEPs must be enabled for "transmission" in order to cause
> a System Error via the Root Control register or (when the Advanced Error
> Reporting Capability is present) reporting via the Root Error Command
> register and logging in the Root Error Status register and Error Source
> Identification register.
>
> Given the commonality with Root Ports and the need to also support AER and
> PME services for RCECs, extend the Root Port driver to support RCEC devices
> by adding the RCEC Class ID to the driver structure.
>
> Co-developed-by: Sean V Kelley <sean.v.kelley@intel.com>
> Link: https://lore.kernel.org/r/20201002184735.1229220-3-seanvk.dev@oregontracks.org
> Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>
> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> ---
> drivers/pci/pcie/portdrv_pci.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
> index 3a3ce40ae1ab..4d880679b9b1 100644
> --- a/drivers/pci/pcie/portdrv_pci.c
> +++ b/drivers/pci/pcie/portdrv_pci.c
> @@ -106,7 +106,8 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
> if (!pci_is_pcie(dev) ||
> ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
> (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
> - (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
> + (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM) &&
> + (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_EC)))
> return -ENODEV;
>
> status = pcie_port_device_register(dev);
> @@ -195,6 +196,8 @@ static const struct pci_device_id port_pci_ids[] = {
> { PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0) },
> /* subtractive decode PCI-to-PCI bridge, class type is 060401h */
> { PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x01), ~0) },
> + /* handle any Root Complex Event Collector */
> + { PCI_DEVICE_CLASS(((PCI_CLASS_SYSTEM_RCEC << 8) | 0x00), ~0) },
> { },
> };
>
>

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

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