diff options
| author |   Heiner Kallweit <hkallweit1@gmail.com> | 2019-10-05 14:07:18 +0200 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2019-10-15 15:22:59 -0500 |
| commit | 687aaf386aeb551130f31705ce40d1341047a936 (patch) | |
| tree | 290bbd16dbda038db405d7b03a74bde35e316c8b /drivers/pci/pcie | |
| parent | PCI/ASPM: Allow re-enabling Clock PM (diff) | |
| download | wireguard-linux-687aaf386aeb551130f31705ce40d1341047a936.tar.xz wireguard-linux-687aaf386aeb551130f31705ce40d1341047a936.zip | |
PCI/ASPM: Add pcie_aspm_get_link()
Factor out getting the link associated with a pci_dev and use this helper
where appropriate. In addition this helper will be used in a subsequent
patch of this series.
Link: https://lore.kernel.org/r/19d33770-29de-a9af-4d85-f2b30269d383@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pcie')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 23e1d6b88655..2d5ecede8fa3 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1066,19 +1066,26 @@ void pcie_aspm_powersave_config_link(struct pci_dev *pdev) up_read(&pci_bus_sem); } -static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem) +static struct pcie_link_state *pcie_aspm_get_link(struct pci_dev *pdev) { - struct pci_dev *parent = pdev->bus->self; - struct pcie_link_state *link; + struct pci_dev *bridge; if (!pci_is_pcie(pdev)) - return 0; + return NULL; - if (pcie_downstream_port(pdev)) - parent = pdev; - if (!parent || !parent->link_state) - return -EINVAL; + bridge = pci_upstream_bridge(pdev); + if (!bridge || !pci_is_pcie(bridge)) + return NULL; + return bridge->link_state; +} + +static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem) +{ + struct pcie_link_state *link = pcie_aspm_get_link(pdev); + + if (!link) + return -EINVAL; /* * A driver requested that ASPM be disabled on this device, but * if we don't have permission to manage ASPM (e.g., on ACPI @@ -1095,7 +1102,6 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem) if (sem) down_read(&pci_bus_sem); mutex_lock(&aspm_lock); - link = parent->link_state; if (state & PCIE_LINK_STATE_L0S) link->aspm_disable |= ASPM_STATE_L0S; if (state & PCIE_LINK_STATE_L1) @@ -1193,12 +1199,12 @@ module_param_call(policy, pcie_aspm_set_policy, pcie_aspm_get_policy, */ bool pcie_aspm_enabled(struct pci_dev *pdev) { - struct pci_dev *bridge = pci_upstream_bridge(pdev); + struct pcie_link_state *link = pcie_aspm_get_link(pdev); - if (!bridge) + if (!link) return false; - return bridge->link_state ? !!bridge->link_state->aspm_enabled : false; + return link->aspm_enabled; } EXPORT_SYMBOL_GPL(pcie_aspm_enabled); |