From 03824eba88fb3d18623071eb660da6c28d3cd9f3 Mon Sep 17 00:00:00 2001 From: Lukas Wunner Date: Wed, 20 Mar 2019 12:05:30 +0100 Subject: [PATCH] PCI/LINK: Deduplicate bandwidth reports for multi-function devices If a multi-function device's bandwidth is already limited when it is enumerated, a message is logged only for function 0. By contrast, when downtraining occurs after enumeration, a message is logged for all functions. That's because the former uses pcie_report_downtraining(), whereas the latter uses __pcie_print_link_status() (which doesn't filter functions != 0). I am seeing this happen on a MacBookPro9,1 with a GPU (function 0) and an integrated HDA controller (function 1). Avoid this incongruence by calling pcie_report_downtraining() in both cases. Signed-off-by: Lukas Wunner Signed-off-by: Bjorn Helgaas Reviewed-by: Alexandru Gagniuc --- drivers/pci/pci.h | 1 + drivers/pci/pcie/bw_notification.c | 2 +- drivers/pci/probe.c | 2 +- 3 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 224d886341158..d994839a3e24b 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -273,6 +273,7 @@ enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev); u32 pcie_bandwidth_capable(struct pci_dev *dev, enum pci_bus_speed *speed, enum pcie_link_width *width); void __pcie_print_link_status(struct pci_dev *dev, bool verbose); +void pcie_report_downtraining(struct pci_dev *dev); /* Single Root I/O Virtualization */ struct pci_sriov { diff --git a/drivers/pci/pcie/bw_notification.c b/drivers/pci/pcie/bw_notification.c index 3c0f368c879ba..4fa9e3523ee1a 100644 --- a/drivers/pci/pcie/bw_notification.c +++ b/drivers/pci/pcie/bw_notification.c @@ -76,7 +76,7 @@ static irqreturn_t pcie_bw_notification_handler(int irq, void *context) */ down_read(&pci_bus_sem); list_for_each_entry(dev, &port->subordinate->devices, bus_list) - __pcie_print_link_status(dev, false); + pcie_report_downtraining(dev); up_read(&pci_bus_sem); return IRQ_HANDLED; diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 2ec0df04e0dca..7e12d01638639 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2388,7 +2388,7 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) return dev; } -static void pcie_report_downtraining(struct pci_dev *dev) +void pcie_report_downtraining(struct pci_dev *dev) { if (!pci_is_pcie(dev)) return; -- 2.39.5