linux-kernel - Re: [PATCH v6 02/10] PCI/RCEC: Bind RCEC devices to the Root Port driver

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Date:   Fri, 25 Sep 2020 14:39:56 -0700
From:   "Sean V Kelley" <sean.v.kelley@...el.com>
To:     "Bjorn Helgaas" <helgaas@...nel.org>
Cc:     "Sean V Kelley" <seanvk.dev@...gontracks.org>, bhelgaas@...gle.com,
        Jonathan.Cameron@...wei.com, rafael.j.wysocki@...el.com,
        ashok.raj@...el.com, tony.luck@...el.com,
        sathyanarayanan.kuppuswamy@...el.com, qiuxu.zhuo@...el.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 02/10] PCI/RCEC: Bind RCEC devices to the Root Port
 driver

On 25 Sep 2020, at 12:59, Bjorn Helgaas wrote:

> On Tue, Sep 22, 2020 at 02:38:51PM -0700, Sean V Kelley wrote:
>> From: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
>>
>> If a Root Complex Integrated Endpoint (RCiEP) is implemented, errors 
>> may
>> optionally be sent to a corresponding Root Complex Event Collector 
>> (RCEC).
>> Each RCiEP must be associated with no more than one RCEC. Interface 
>> errors
>> are reported to the OS by RCECs.
>>
>> For an RCEC (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 through the addition of the RCEC Class ID to the driver
>> structure.
>>
>> Co-developed-by: Sean V Kelley <sean.v.kelley@...el.com>
>> Signed-off-by: Sean V Kelley <sean.v.kelley@...el.com>
>> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
>> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> ---
>>  drivers/pci/pcie/portdrv_core.c | 8 ++++----
>>  drivers/pci/pcie/portdrv_pci.c  | 5 ++++-
>>  2 files changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/pci/pcie/portdrv_core.c 
>> b/drivers/pci/pcie/portdrv_core.c
>> index 50a9522ab07d..99769c636775 100644
>> --- a/drivers/pci/pcie/portdrv_core.c
>> +++ b/drivers/pci/pcie/portdrv_core.c
>> @@ -234,11 +234,11 @@ static int get_port_device_capability(struct 
>> pci_dev *dev)
>>  #endif
>>
>>  	/*
>> -	 * Root ports are capable of generating PME too.  Root Complex
>> -	 * Event Collectors can also generate PMEs, but we don't handle
>> -	 * those yet.
>> +	 * Root ports and Root Complex Event Collectors are capable
>> +	 * of generating PME.
>>  	 */
>> -	if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT &&
>> +	if ((pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
>> +	     pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC) &&
>
> It seems like this change belongs in patch 09/10, where we change
> pme.c so it claims both Root Ports and RCECs.  Does this hunk
> accomplish anything before 09/10?

You are right.  It’s not needed until 09/10.  Will move.

Thanks,

Sean

>
>>  	    (pcie_ports_native || host->native_pme)) {
>>  		services |= PCIE_PORT_SERVICE_PME;
>>
>> 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) },
>>  	{ },
>>  };
>>
>> -- 
>> 2.28.0
>>