diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/pci.c | 27 | ||||
| -rw-r--r-- | drivers/pci/pci.h | 1 | ||||
| -rw-r--r-- | drivers/pci/probe.c | 21 |
3 files changed, 42 insertions, 7 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 97acba712e4e..a84d341504a5 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5264,14 +5264,16 @@ u32 pcie_bandwidth_capable(struct pci_dev *dev, enum pci_bus_speed *speed, } /** - * pcie_print_link_status - Report the PCI device's link speed and width + * __pcie_print_link_status - Report the PCI device's link speed and width * @dev: PCI device to query + * @verbose: Print info even when enough bandwidth is available * - * Report the available bandwidth at the device. If this is less than the - * device is capable of, report the device's maximum possible bandwidth and - * the upstream link that limits its performance to less than that. + * If the available bandwidth at the device is less than the device is + * capable of, report the device's maximum possible bandwidth and the + * upstream link that limits its performance. If @verbose, always print + * the available bandwidth, even if the device isn't constrained. */ -void pcie_print_link_status(struct pci_dev *dev) +void __pcie_print_link_status(struct pci_dev *dev, bool verbose) { enum pcie_link_width width, width_cap; enum pci_bus_speed speed, speed_cap; @@ -5281,11 +5283,11 @@ void pcie_print_link_status(struct pci_dev *dev) bw_cap = pcie_bandwidth_capable(dev, &speed_cap, &width_cap); bw_avail = pcie_bandwidth_available(dev, &limiting_dev, &speed, &width); - if (bw_avail >= bw_cap) + if (bw_avail >= bw_cap && verbose) pci_info(dev, "%u.%03u Gb/s available PCIe bandwidth (%s x%d link)\n", bw_cap / 1000, bw_cap % 1000, PCIE_SPEED2STR(speed_cap), width_cap); - else + else if (bw_avail < bw_cap) pci_info(dev, "%u.%03u Gb/s available PCIe bandwidth, limited by %s x%d link at %s (capable of %u.%03u Gb/s with %s x%d link)\n", bw_avail / 1000, bw_avail % 1000, PCIE_SPEED2STR(speed), width, @@ -5293,6 +5295,17 @@ void pcie_print_link_status(struct pci_dev *dev) bw_cap / 1000, bw_cap % 1000, PCIE_SPEED2STR(speed_cap), width_cap); } + +/** + * pcie_print_link_status - Report the PCI device's link speed and width + * @dev: PCI device to query + * + * Report the available bandwidth at the device. + */ +void pcie_print_link_status(struct pci_dev *dev) +{ + __pcie_print_link_status(dev, true); +} EXPORT_SYMBOL(pcie_print_link_status); /** diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 70808c168fb9..ce880dab5bc8 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -263,6 +263,7 @@ enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev); 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); /* Single Root I/O Virtualization */ struct pci_sriov { diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 7c0c8ab94bcf..71412db3cbeb 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2223,6 +2223,25 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) return dev; } +static void pcie_report_downtraining(struct pci_dev *dev) +{ + if (!pci_is_pcie(dev)) + return; + + /* Look from the device up to avoid downstream ports with no devices */ + if ((pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT) && + (pci_pcie_type(dev) != PCI_EXP_TYPE_LEG_END) && + (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM)) + return; + + /* Multi-function PCIe devices share the same link/status */ + if (PCI_FUNC(dev->devfn) != 0 || dev->is_virtfn) + return; + + /* Print link status only if the device is constrained by the fabric */ + __pcie_print_link_status(dev, false); +} + static void pci_init_capabilities(struct pci_dev *dev) { /* Enhanced Allocation */ @@ -2258,6 +2277,8 @@ static void pci_init_capabilities(struct pci_dev *dev) /* Advanced Error Reporting */ pci_aer_init(dev); + pcie_report_downtraining(dev); + if (pci_probe_reset_function(dev) == 0) dev->reset_fn = 1; } |