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From: Bjorn Helgaas <helgaas@kernel.org>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: mr.nuke.me@gmail.com, linux-pci@vger.kernel.org,
	austin_bolen@dell.com, alex_gagniuc@dellteam.com,
	keith.busch@intel.com, Shyam_Iyer@Dell.com, lukas@wunner.de,
	okaya@kernel.org, torvalds@linux-foundation.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] PCI/LINK: Account for BW notification in vector calculation
Date: Wed, 1 May 2019 15:30:00 -0500	[thread overview]
Message-ID: <20190501203000.GA47079@google.com> (raw)
In-Reply-To: <155597243666.19387.1205950870601742062.stgit@gimli.home>

On Mon, Apr 22, 2019 at 04:43:30PM -0600, Alex Williamson wrote:
> On systems that don't support any PCIe services other than bandwidth
> notification, pcie_message_numbers() can return zero vectors, causing
> the vector reallocation in pcie_port_enable_irq_vec() to retry with
> zero, which fails, resulting in fallback to INTx (which might be
> broken) for the bandwidth notification service.  This can resolve
> spurious interrupt faults due to this service on some systems.
> 
> Fixes: e8303bb7a75c ("PCI/LINK: Report degraded links via link bandwidth notification")
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

Applied for (hopefully) v5.1, thanks!

>  drivers/pci/pcie/portdrv_core.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
> index 7d04f9d087a6..1b330129089f 100644
> --- a/drivers/pci/pcie/portdrv_core.c
> +++ b/drivers/pci/pcie/portdrv_core.c
> @@ -55,7 +55,8 @@ static int pcie_message_numbers(struct pci_dev *dev, int mask,
>  	 * 7.8.2, 7.10.10, 7.31.2.
>  	 */
>  
> -	if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP)) {
> +	if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP |
> +		    PCIE_PORT_SERVICE_BWNOTIF)) {
>  		pcie_capability_read_word(dev, PCI_EXP_FLAGS, &reg16);
>  		*pme = (reg16 & PCI_EXP_FLAGS_IRQ) >> 9;
>  		nvec = *pme + 1;
> 

      parent reply	other threads:[~2019-05-01 20:30 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-22 22:43 Alex Williamson
2019-04-23  0:05 ` Alex G
2019-04-23  0:33   ` Alex Williamson
2019-04-23 14:33     ` Alex G
2019-04-23 15:34       ` Alex Williamson
2019-04-23 15:49         ` Lukas Wunner
2019-04-23 16:03         ` Alex G
2019-04-23 16:22           ` Alex Williamson
2019-04-23 16:27             ` Alex G
2019-04-23 16:37               ` Alex Williamson
2019-04-23 17:10       ` Bjorn Helgaas
2019-04-23 17:53         ` Alex G
2019-04-23 18:38           ` Alex Williamson
2019-04-23 17:59 ` Alex G
2019-05-01 20:30 ` Bjorn Helgaas [this message]

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