Re: [PATCH] PCI/LINK: Account for BW notification in vector calculation

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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!



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