linux-kernel - Re: [PATCH v3] PCI/ERR: Use pcie_aer_is_native() to judge whether OS owns AER

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Date:   Tue, 26 Jul 2022 21:02:10 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Zhuo Chen <chenzhuo.1@...edance.com>, ruscur@...sell.cc,
        oohall@...il.com, bhelgaas@...gle.com
Cc:     lukas@...ner.de, jan.kiszka@...mens.com, stuart.w.hayes@...il.com,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] PCI/ERR: Use pcie_aer_is_native() to judge whether OS
 owns AER



On 7/26/22 8:53 PM, Zhuo Chen wrote:
> Use pcie_aer_is_native() in place of "host->native_aer ||
> pcie_ports_native" to judge whether OS has native control of AER
> in pcie_do_recovery().
> 
> Replace "dev->aer_cap && (pcie_ports_native || host->native_aer)" in
> get_port_device_capability() with pcie_aer_is_native(), which has no
> functional changes.
> 
> Signed-off-by: Zhuo Chen <chenzhuo.1@...edance.com>
> ---

Patch looks better now. It looks like following two changes
can also be replaced with pcie_aer_is_native() check.

drivers/pci/pcie/aer.c:1407:	if ((host->native_aer || pcie_ports_native) && aer) {
drivers/pci/pcie/aer.c:1426:	if ((host->native_aer || pcie_ports_native) && aer) {



> Changelog:
> v3:
> - Simplify why we use pcie_aer_is_native().
> - Revert modification of pci_aer_clear_nonfatal_status() and comments.
> v2:
> - Add details and note in commit log.
> ---
>  drivers/pci/pcie/err.c          | 3 +--
>  drivers/pci/pcie/portdrv_core.c | 3 +--
>  2 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
> index 0c5a143025af..121a53338e44 100644
> --- a/drivers/pci/pcie/err.c
> +++ b/drivers/pci/pcie/err.c
> @@ -184,7 +184,6 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>  	int type = pci_pcie_type(dev);
>  	struct pci_dev *bridge;
>  	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
> -	struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
>  
>  	/*
>  	 * If the error was detected by a Root Port, Downstream Port, RCEC,
> @@ -243,7 +242,7 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>  	 * it is responsible for clearing this status.  In that case, the
>  	 * signaling device may not even be visible to the OS.
>  	 */
> -	if (host->native_aer || pcie_ports_native) {
> +	if (pcie_aer_is_native(dev)) {
>  		pcie_clear_device_status(dev);
>  		pci_aer_clear_nonfatal_status(dev);
>  	}
> diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
> index 604feeb84ee4..98c18f4a01b2 100644
> --- a/drivers/pci/pcie/portdrv_core.c
> +++ b/drivers/pci/pcie/portdrv_core.c
> @@ -221,8 +221,7 @@ static int get_port_device_capability(struct pci_dev *dev)
>  	}
>  
>  #ifdef CONFIG_PCIEAER
> -	if (dev->aer_cap && pci_aer_available() &&
> -	    (pcie_ports_native || host->native_aer)) {
> +	if (pcie_aer_is_native(dev) && pci_aer_available()) {
>  		services |= PCIE_PORT_SERVICE_AER;
>  
>  		/*

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer