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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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28
drivers/pci/pci-sysfs.c
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@@ -158,33 +158,9 @@ static DEVICE_ATTR_RO(resource);
static ssize_t max_link_speed_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
u32 linkcap;
int err;
const char *speed;
struct pci_dev *pdev = to_pci_dev(dev);
err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap);
if (err)
return -EINVAL;
switch (linkcap & PCI_EXP_LNKCAP_SLS) {
case PCI_EXP_LNKCAP_SLS_16_0GB:
speed = "16 GT/s";
break;
case PCI_EXP_LNKCAP_SLS_8_0GB:
speed = "8 GT/s";
break;
case PCI_EXP_LNKCAP_SLS_5_0GB:
speed = "5 GT/s";
break;
case PCI_EXP_LNKCAP_SLS_2_5GB:
speed = "2.5 GT/s";
break;
default:
speed = "Unknown speed";
}
return sprintf(buf, "%s\n", speed);
return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
}
static DEVICE_ATTR_RO(max_link_speed);