| Message ID | 1491627351-1111-2-git-send-email-okaya@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
Hi Sinan, On Sat, Apr 08, 2017 at 12:55:47AM -0400, Sinan Kaya wrote: > We need a callback from pci_init_capabilities function for every > single new PCI device that is currently being added. > > pci_aspm_init() will be used to save the power on state of the HW. > > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=194895 > Signed-off-by: Sinan Kaya <okaya@codeaurora.org> > --- > drivers/pci/pcie/aspm.c | 10 ++++++++++ > drivers/pci/probe.c | 3 +++ > include/linux/pci.h | 2 ++ > 3 files changed, 15 insertions(+) > > diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > index 1dfa10c..dc36717 100644 > --- a/drivers/pci/pcie/aspm.c > +++ b/drivers/pci/pcie/aspm.c > @@ -827,6 +827,16 @@ static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev) > } > > /* > + * pci_aspm_init: Initiate PCI express link state. > + * It is called from device_add for every single pci device. > + * @pdev: all pci devices > + */ > +int pci_aspm_init(struct pci_dev *pdev) > +{ > + return 0; > +} > + > +/* > * pcie_aspm_init_link_state: Initiate PCI express link state. > * It is called after the pcie and its children devices are scanned. > * @pdev: the root port or switch downstream port > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index dfc9a27..1e19364 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -1847,6 +1847,9 @@ static void pci_init_capabilities(struct pci_dev *dev) > > /* Advanced Error Reporting */ > pci_aer_init(dev); > + > + /* Active State Power Management */ > + pci_aspm_init(dev); > } > > /* > diff --git a/include/linux/pci.h b/include/linux/pci.h > index eb3da1a..8828dd7 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1396,8 +1396,10 @@ static inline int pci_irq_get_node(struct pci_dev *pdev, int vec) > > #ifdef CONFIG_PCIEASPM > bool pcie_aspm_support_enabled(void); > +int pci_aspm_init(struct pci_dev *pdev); I think these can go in drivers/pci/pci.h instead of the public include/linux/pci.h. There's no ASPM section in drivers/pci/pci.h yet, but I think we should add one. It looks like the following things from include/linux/pci-aspm.h could be moved there as well, since they're only used by the PCI core: void pcie_aspm_init_link_state(struct pci_dev *pdev); void pcie_aspm_exit_link_state(struct pci_dev *pdev); void pcie_aspm_pm_state_change(struct pci_dev *pdev); void pcie_aspm_powersave_config_link(struct pci_dev *pdev); void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev); void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev); This would be a separate patch. > #else > static inline bool pcie_aspm_support_enabled(void) { return false; } > +static inline int pci_aspm_init(struct pci_dev *pdev) { return -ENODEV; } > #endif > > #ifdef CONFIG_PCIEAER > -- > 1.9.1 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
On 4/13/2017 4:51 PM, Bjorn Helgaas wrote: > I think these can go in drivers/pci/pci.h instead of the public > include/linux/pci.h. There's no ASPM section in drivers/pci/pci.h > yet, but I think we should add one. > > It looks like the following things from include/linux/pci-aspm.h could > be moved there as well, since they're only used by the PCI core: > > void pcie_aspm_init_link_state(struct pci_dev *pdev); > void pcie_aspm_exit_link_state(struct pci_dev *pdev); > void pcie_aspm_pm_state_change(struct pci_dev *pdev); > void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev); > void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev); > > This would be a separate patch. > Sure, let me work on this. >> #else >> static inline bool pcie_aspm_support_enabled(void) { return false; } >> +static inline int pci_aspm_init(struct pci_dev *pdev) { return -ENODEV; } >> #endif
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 1dfa10c..dc36717 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -827,6 +827,16 @@ static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev) } /* + * pci_aspm_init: Initiate PCI express link state. + * It is called from device_add for every single pci device. + * @pdev: all pci devices + */ +int pci_aspm_init(struct pci_dev *pdev) +{ + return 0; +} + +/* * pcie_aspm_init_link_state: Initiate PCI express link state. * It is called after the pcie and its children devices are scanned. * @pdev: the root port or switch downstream port diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index dfc9a27..1e19364 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1847,6 +1847,9 @@ static void pci_init_capabilities(struct pci_dev *dev) /* Advanced Error Reporting */ pci_aer_init(dev); + + /* Active State Power Management */ + pci_aspm_init(dev); } /* diff --git a/include/linux/pci.h b/include/linux/pci.h index eb3da1a..8828dd7 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1396,8 +1396,10 @@ static inline int pci_irq_get_node(struct pci_dev *pdev, int vec) #ifdef CONFIG_PCIEASPM bool pcie_aspm_support_enabled(void); +int pci_aspm_init(struct pci_dev *pdev); #else static inline bool pcie_aspm_support_enabled(void) { return false; } +static inline int pci_aspm_init(struct pci_dev *pdev) { return -ENODEV; } #endif #ifdef CONFIG_PCIEAER
We need a callback from pci_init_capabilities function for every single new PCI device that is currently being added. pci_aspm_init() will be used to save the power on state of the HW. Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=194895 Signed-off-by: Sinan Kaya <okaya@codeaurora.org> --- drivers/pci/pcie/aspm.c | 10 ++++++++++ drivers/pci/probe.c | 3 +++ include/linux/pci.h | 2 ++ 3 files changed, 15 insertions(+)