lkml.org 
[lkml]   [2019]   [Apr]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: [PATCH] PCI/LINK: Account for BW notification in vector calculation
From
Date
On 4/22/19 5:43 PM, Alex Williamson wrote:
> [ 329.725607] vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth,
> limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5
> GT/s x16 link)
> [ 708.151488] vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth,
> limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5
> GT/s x16 link)
> [ 718.262959] vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth,
> limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5
> GT/s x16 link)
> [ 1138.124932] vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth,
> limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5
> GT/s x16 link)
>
> What is the value of this nagging?

Good! The bandwidth notification service is working as intended. If this
bothers you, you can unbind the device from the bandwidth notification
driver:

echo 0000:07:00.0:pcie010 |
sudo tee /sys/bus/pci_express/drivers/pcie_bw_notification/unbind



> 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;

Good catch!

\
 
 \ /
  Last update: 2019-04-23 02:07    [W:0.158 / U:1.728 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site