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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 <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alexandru Gagniuc <alex.gagniuc@dellteam.com>
This commit is contained in:
Lukas Wunner 2019-03-20 12:05:30 +01:00 committed by Bjorn Helgaas
parent 55397ce8df
commit 0fa635aec9
3 changed files with 3 additions and 2 deletions
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1
drivers/pci/pci.h
View File

@ -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 {

2
drivers/pci/pcie/bw_notification.c
View File

@ -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;

2
drivers/pci/probe.c
View File

@ -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;