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Date:   Mon, 21 Sep 2020 12:31:56 +0100
From:   Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To:     Sean V Kelley <sean.v.kelley@intel.com>
CC:     <bhelgaas@google.com>, <rafael.j.wysocki@intel.com>,
        <ashok.raj@intel.com>, <tony.luck@intel.com>,
        <sathyanarayanan.kuppuswamy@intel.com>, <qiuxu.zhuo@intel.com>,
        <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 07/10] PCI/RCEC: Add RCiEP's linked RCEC to AER/ERR
Message-ID: <20200921123156.00000f18@Huawei.com>
In-Reply-To: <20200918204603.62100-8-sean.v.kelley@intel.com>
References: <20200918204603.62100-1-sean.v.kelley@intel.com>
        <20200918204603.62100-8-sean.v.kelley@intel.com>
Organization: Huawei Technologies Research and Development (UK) Ltd.
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On Fri, 18 Sep 2020 13:46:00 -0700
Sean V Kelley <sean.v.kelley@intel.com> wrote:

> From: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
> 
> When attempting error recovery for an RCiEP associated with an RCEC device,
> there needs to be a way to update the Root Error Status, the Uncorrectable
> Error Status and the Uncorrectable Error Severity of the parent RCEC.
> In some non-native cases in which there is no OS visible device
> associated with the RCiEP, there is nothing to act upon as the firmware
> is acting before the OS. So add handling for the linked 'rcec' in AER/ERR
> while taking into account non-native cases.
> 
> Co-developed-by: Sean V Kelley <sean.v.kelley@intel.com>
> Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>
> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
I'll give this a test run later to check I'm not missing anything, but LGTM.

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

Thanks,

> ---
>  drivers/pci/pcie/aer.c |  9 +++++----
>  drivers/pci/pcie/err.c | 38 ++++++++++++++++++++++++--------------
>  2 files changed, 29 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 65dff5f3457a..dccdba60b5d9 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -1358,17 +1358,18 @@ static int aer_probe(struct pcie_device *dev)
>  static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
>  {
>  	int aer = dev->aer_cap;
> +	int rc = 0;
>  	u32 reg32;
> -	int rc;
> -
>  
>  	/* Disable Root's interrupt in response to error messages */
>  	pci_read_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
>  	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
>  	pci_write_config_dword(dev, aer + PCI_ERR_ROOT_COMMAND, reg32);
>  
> -	rc = pci_bus_error_reset(dev);
> -	pci_info(dev, "Root Port link has been reset\n");
> +	if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_EC) {
> +		rc = pci_bus_error_reset(dev);
> +		pci_info(dev, "Root Port link has been reset\n");
> +	}
>  
>  	/* Clear Root Error Status */
>  	pci_read_config_dword(dev, aer + PCI_ERR_ROOT_STATUS, &reg32);
> diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
> index 5380ecc41506..a61a2518163a 100644
> --- a/drivers/pci/pcie/err.c
> +++ b/drivers/pci/pcie/err.c
> @@ -149,7 +149,8 @@ static int report_resume(struct pci_dev *dev, void *data)
>  /**
>   * pci_bridge_walk - walk bridges potentially AER affected
>   * @bridge   bridge which may be an RCEC with associated RCiEPs,
> - *           an RCiEP associated with an RCEC, or a Port.
> + *           or a Port.
> + * @dev      an RCiEP lacking an associated RCEC.
>   * @cb       callback to be called for each device found
>   * @userdata arbitrary pointer to be passed to callback.
>   *
> @@ -160,13 +161,16 @@ static int report_resume(struct pci_dev *dev, void *data)
>   * If the device provided has no subordinate bus, call the provided
>   * callback on the device itself.
>   */
> -static void pci_bridge_walk(struct pci_dev *bridge, int (*cb)(struct pci_dev *, void *),
> +static void pci_bridge_walk(struct pci_dev *bridge, struct pci_dev *dev,
> +			    int (*cb)(struct pci_dev *, void *),
>  			    void *userdata)
>  {
> -	if (bridge->subordinate)
> +	if (bridge && bridge->subordinate)
>  		pci_walk_bus(bridge->subordinate, cb, userdata);
> -	else
> +	else if (bridge)
>  		cb(bridge, userdata);
> +	else
> +		cb(dev, userdata);
>  }
>  
>  static pci_ers_result_t flr_on_rciep(struct pci_dev *dev)
> @@ -196,16 +200,24 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>  	type = pci_pcie_type(dev);
>  	if (type == PCI_EXP_TYPE_ROOT_PORT ||
>  	    type == PCI_EXP_TYPE_DOWNSTREAM ||
> -	    type == PCI_EXP_TYPE_RC_EC ||
> -	    type == PCI_EXP_TYPE_RC_END)
> +	    type == PCI_EXP_TYPE_RC_EC)
>  		bridge = dev;
> +	else if (type == PCI_EXP_TYPE_RC_END)
> +		bridge = dev->rcec;
>  	else
>  		bridge = pci_upstream_bridge(dev);
>  
>  	pci_dbg(dev, "broadcast error_detected message\n");
>  	if (state == pci_channel_io_frozen) {
> -		pci_bridge_walk(bridge, report_frozen_detected, &status);
> +		pci_bridge_walk(bridge, dev, report_frozen_detected, &status);
>  		if (type == PCI_EXP_TYPE_RC_END) {
> +			/*
> +			 * The callback only clears the Root Error Status
> +			 * of the RCEC (see aer.c).
> +			 */
> +			if (bridge)
> +				reset_subordinate_devices(bridge);
> +
>  			status = flr_on_rciep(dev);
>  			if (status != PCI_ERS_RESULT_RECOVERED) {
>  				pci_warn(dev, "function level reset failed\n");
> @@ -219,13 +231,13 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>  			}
>  		}
>  	} else {
> -		pci_bridge_walk(bridge, report_normal_detected, &status);
> +		pci_bridge_walk(bridge, dev, report_normal_detected, &status);
>  	}
>  
>  	if (status == PCI_ERS_RESULT_CAN_RECOVER) {
>  		status = PCI_ERS_RESULT_RECOVERED;
>  		pci_dbg(dev, "broadcast mmio_enabled message\n");
> -		pci_bridge_walk(bridge, report_mmio_enabled, &status);
> +		pci_bridge_walk(bridge, dev, report_mmio_enabled, &status);
>  	}
>  
>  	if (status == PCI_ERS_RESULT_NEED_RESET) {
> @@ -236,18 +248,16 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>  		 */
>  		status = PCI_ERS_RESULT_RECOVERED;
>  		pci_dbg(dev, "broadcast slot_reset message\n");
> -		pci_bridge_walk(bridge, report_slot_reset, &status);
> +		pci_bridge_walk(bridge, dev, report_slot_reset, &status);
>  	}
>  
>  	if (status != PCI_ERS_RESULT_RECOVERED)
>  		goto failed;
>  
>  	pci_dbg(dev, "broadcast resume message\n");
> -	pci_bridge_walk(bridge, report_resume, &status);
> +	pci_bridge_walk(bridge, dev, report_resume, &status);
>  
> -	if (type == PCI_EXP_TYPE_ROOT_PORT ||
> -	    type == PCI_EXP_TYPE_DOWNSTREAM ||
> -	    type == PCI_EXP_TYPE_RC_EC) {
> +	if (bridge) {
>  		if (pcie_aer_is_native(bridge))
>  			pcie_clear_device_status(bridge);
>  		pci_aer_clear_nonfatal_status(bridge);