linux-kernel - Re: [PATCH V2 7/9] PCI/AER: Add RCEC AER handling

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Date:   Wed, 5 Aug 2020 18:49:07 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Sean V Kelley <sean.v.kelley@...el.com>
CC:     <bhelgaas@...gle.com>, <rjw@...ysocki.net>, <ashok.raj@...el.com>,
        <tony.luck@...el.com>,
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>
Subject: Re: [PATCH V2 7/9] PCI/AER: Add RCEC AER handling

On Tue, 4 Aug 2020 12:40:50 -0700
Sean V Kelley <sean.v.kelley@...el.com> wrote:

> The Root Complex Event Collectors(RCEC) appear as peers to Root Ports
> and also have the AER capability. So add RCEC support to the current AER
> service driver and attach the AER service driver to the RCEC device.
> 
> Co-developed-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
> Signed-off-by: Sean V Kelley <sean.v.kelley@...el.com>
> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>

Looks good to me.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/pci/pcie/aer.c | 27 ++++++++++++++++++++-------
>  1 file changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index f658607e8e00..55ee9518368f 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -300,7 +300,7 @@ int pci_aer_raw_clear_status(struct pci_dev *dev)
>  		return -EIO;
>  
>  	port_type = pci_pcie_type(dev);
> -	if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
> +	if (port_type == PCI_EXP_TYPE_ROOT_PORT || port_type == PCI_EXP_TYPE_RC_EC) {
>  		pci_read_config_dword(dev, aer + PCI_ERR_ROOT_STATUS, &status);
>  		pci_write_config_dword(dev, aer + PCI_ERR_ROOT_STATUS, status);
>  	}
> @@ -595,7 +595,8 @@ static umode_t aer_stats_attrs_are_visible(struct kobject *kobj,
>  	if ((a == &dev_attr_aer_rootport_total_err_cor.attr ||
>  	     a == &dev_attr_aer_rootport_total_err_fatal.attr ||
>  	     a == &dev_attr_aer_rootport_total_err_nonfatal.attr) &&
> -	    pci_pcie_type(pdev) != PCI_EXP_TYPE_ROOT_PORT)
> +	    ((pci_pcie_type(pdev) != PCI_EXP_TYPE_ROOT_PORT) &&
> +	    (pci_pcie_type(pdev) != PCI_EXP_TYPE_RC_EC)))
>  		return 0;
>  
>  	return a->mode;
> @@ -916,7 +917,10 @@ static bool find_source_device(struct pci_dev *parent,
>  	if (result)
>  		return true;
>  
> -	pci_walk_bus(parent->subordinate, find_device_iter, e_info);
> +	if (pci_pcie_type(parent) == PCI_EXP_TYPE_RC_EC)
> +		pcie_walk_rcec(parent, find_device_iter, e_info);
> +	else
> +		pci_walk_bus(parent->subordinate, find_device_iter, e_info);
>  
>  	if (!e_info->error_dev_num) {
>  		pci_info(parent, "can't find device of ID%04x\n", e_info->id);
> @@ -1053,6 +1057,7 @@ int aer_get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
>  		if (!(info->status & ~info->mask))
>  			return 0;
>  	} else if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
> +		   pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC ||
>  	           pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||
>  		   info->severity == AER_NONFATAL) {
>  
> @@ -1205,6 +1210,7 @@ static int set_device_error_reporting(struct pci_dev *dev, void *data)
>  	int type = pci_pcie_type(dev);
>  
>  	if ((type == PCI_EXP_TYPE_ROOT_PORT) ||
> +	    (type == PCI_EXP_TYPE_RC_EC) ||
>  	    (type == PCI_EXP_TYPE_UPSTREAM) ||
>  	    (type == PCI_EXP_TYPE_DOWNSTREAM)) {
>  		if (enable)
> @@ -1229,9 +1235,11 @@ static void set_downstream_devices_error_reporting(struct pci_dev *dev,
>  {
>  	set_device_error_reporting(dev, &enable);
>  
> -	if (!dev->subordinate)
> -		return;
> -	pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable);
> +	if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC)
> +		pcie_walk_rcec(dev, set_device_error_reporting, &enable);
> +	else if (dev->subordinate)
> +		pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable);
> +
>  }
>  
>  /**
> @@ -1329,6 +1337,11 @@ static int aer_probe(struct pcie_device *dev)
>  	struct device *device = &dev->device;
>  	struct pci_dev *port = dev->port;
>  
> +	/* Limit to Root Ports or Root Complex Event Collectors */
> +	if ((pci_pcie_type(port) != PCI_EXP_TYPE_RC_EC) &&
> +	    (pci_pcie_type(port) != PCI_EXP_TYPE_ROOT_PORT))
> +		return -ENODEV;
> +
>  	rpc = devm_kzalloc(device, sizeof(struct aer_rpc), GFP_KERNEL);
>  	if (!rpc)
>  		return -ENOMEM;
> @@ -1385,7 +1398,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
>  
>  static struct pcie_port_service_driver aerdriver = {
>  	.name		= "aer",
> -	.port_type	= PCI_EXP_TYPE_ROOT_PORT,
> +	.port_type	= PCIE_ANY_PORT,
>  	.service	= PCIE_PORT_SERVICE_AER,
>  
>  	.probe		= aer_probe,