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PCI: Add pcie_get_speed_cap() to find max supported link speed

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Add pcie_get_speed_cap() to find the max link speed supported by a device.
Change max_link_speed_show() to use pcie_get_speed_cap().

Signed-off-by: Tal Gilboa <talgi@mellanox.com>
[bhelgaas: return speed directly instead of error and *speed, don't export
outside drivers/pci]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
This commit is contained in:
Tal Gilboa
2018-03-30 07:44:05 -05:00
committed by Bjorn Helgaas
parent 1acfb9b7ee
commit 6cf57be0f7
3 changed files with 56 additions and 26 deletions
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10
drivers/pci/pci.h
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@@ -253,6 +253,16 @@ bool pci_bus_clip_resource(struct pci_dev *dev, int idx);
void pci_reassigndev_resource_alignment(struct pci_dev *dev);
void pci_disable_bridge_window(struct pci_dev *dev);
/* PCIe link information */
#define PCIE_SPEED2STR(speed) \
((speed) == PCIE_SPEED_16_0GT ? "16 GT/s" : \
(speed) == PCIE_SPEED_8_0GT ? "8 GT/s" : \
(speed) == PCIE_SPEED_5_0GT ? "5 GT/s" : \
(speed) == PCIE_SPEED_2_5GT ? "2.5 GT/s" : \
"Unknown speed")
enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev);
/* Single Root I/O Virtualization */
struct pci_sriov {
int pos; /* Capability position */