linux-kernel - Re: [PATCH v4 1/2] PCI/ERR: Call pci_bus_reset() before calling ->slot

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Message-ID: <20201012210522.GA86612@otc-nc-03>
Date:   Mon, 12 Oct 2020 14:05:22 -0700
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     sathyanarayanan.nkuppuswamy@...il.com
Cc:     bhelgaas@...gle.com, okaya@...nel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        Ashok Raj <ashok.raj@...el.com>
Subject: Re: [PATCH v4 1/2] PCI/ERR: Call pci_bus_reset() before calling
 ->slot_reset() callback

On Sun, Oct 11, 2020 at 10:03:40PM -0700, sathyanarayanan.nkuppuswamy@...il.com wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> 
> Currently if report_error_detected() or report_mmio_enabled()
> functions requests PCI_ERS_RESULT_NEED_RESET, current
> pcie_do_recovery() implementation does not do the requested
> explicit device reset, but instead just calls the
> report_slot_reset() on all affected devices. Notifying about the
> reset via report_slot_reset() without doing the actual device
> reset is incorrect. So call pci_bus_reset() before triggering
> ->slot_reset() callback.
> 
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> ---
>  drivers/pci/pcie/err.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
> index c543f419d8f9..067c58728b88 100644
> --- a/drivers/pci/pcie/err.c
> +++ b/drivers/pci/pcie/err.c
> @@ -181,11 +181,7 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
>  	}
>  
>  	if (status == PCI_ERS_RESULT_NEED_RESET) {
> -		/*
> -		 * TODO: Should call platform-specific
> -		 * functions to reset slot before calling
> -		 * drivers' slot_reset callbacks?
> -		 */
> +		pci_reset_bus(dev);

pci_reset_bus() returns an error, do you need to consult that before
unconditionally setting PCI_ERS_RESULT_RECOVERED?

>  		status = PCI_ERS_RESULT_RECOVERED;
>  		pci_dbg(dev, "broadcast slot_reset message\n");
>  		pci_walk_bus(bus, report_slot_reset, &status);
> -- 
> 2.17.1
>