diff options
Diffstat (limited to 'drivers/pci/pcie')
| -rw-r--r-- | drivers/pci/pcie/Kconfig | 5 | ||||
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 2 | ||||
| -rw-r--r-- | drivers/pci/pcie/pcie-dpc.c | 19 | ||||
| -rw-r--r-- | drivers/pci/pcie/portdrv_core.c | 3 | ||||
| -rw-r--r-- | drivers/pci/pcie/portdrv_pci.c | 52 |
5 files changed, 61 insertions, 20 deletions
diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig index 22ca6412bd15..7fcea75afa4c 100644 --- a/drivers/pci/pcie/Kconfig +++ b/drivers/pci/pcie/Kconfig @@ -83,7 +83,7 @@ config PCIE_PME depends on PCIEPORTBUS && PM config PCIE_DPC - tristate "PCIe Downstream Port Containment support" + bool "PCIe Downstream Port Containment support" depends on PCIEPORTBUS default n help @@ -92,6 +92,3 @@ config PCIE_DPC will be handled by the DPC driver. If your system doesn't have this capability or you do not want to use this feature, it is safe to answer N. - - To compile this driver as a module, choose M here: the module - will be called pcie-dpc. diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 2dfe7fdb77e7..0ec649d961d7 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -139,7 +139,7 @@ static void pcie_set_clkpm_nocheck(struct pcie_link_state *link, int enable) static void pcie_set_clkpm(struct pcie_link_state *link, int enable) { /* Don't enable Clock PM if the link is not Clock PM capable */ - if (!link->clkpm_capable && enable) + if (!link->clkpm_capable) enable = 0; /* Need nothing if the specified equals to current state */ if (link->clkpm_enabled == enable) diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c index ab552f1bc08f..250f87861786 100644 --- a/drivers/pci/pcie/pcie-dpc.c +++ b/drivers/pci/pcie/pcie-dpc.c @@ -15,8 +15,8 @@ struct dpc_dev { struct pcie_device *dev; - struct work_struct work; - int cap_pos; + struct work_struct work; + int cap_pos; }; static void dpc_wait_link_inactive(struct pci_dev *pdev) @@ -89,7 +89,7 @@ static int dpc_probe(struct pcie_device *dev) int status; u16 ctl, cap; - dpc = kzalloc(sizeof(*dpc), GFP_KERNEL); + dpc = devm_kzalloc(&dev->device, sizeof(*dpc), GFP_KERNEL); if (!dpc) return -ENOMEM; @@ -98,11 +98,12 @@ static int dpc_probe(struct pcie_device *dev) INIT_WORK(&dpc->work, interrupt_event_handler); set_service_data(dev, dpc); - status = request_irq(dev->irq, dpc_irq, IRQF_SHARED, "pcie-dpc", dpc); + status = devm_request_irq(&dev->device, dev->irq, dpc_irq, IRQF_SHARED, + "pcie-dpc", dpc); if (status) { dev_warn(&dev->device, "request IRQ%d failed: %d\n", dev->irq, status); - goto out; + return status; } pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap); @@ -117,9 +118,6 @@ static int dpc_probe(struct pcie_device *dev) FLAG(cap, PCI_EXP_DPC_CAP_SW_TRIGGER), (cap >> 8) & 0xf, FLAG(cap, PCI_EXP_DPC_CAP_DL_ACTIVE)); return status; - out: - kfree(dpc); - return status; } static void dpc_remove(struct pcie_device *dev) @@ -131,14 +129,11 @@ static void dpc_remove(struct pcie_device *dev) pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl); ctl &= ~(PCI_EXP_DPC_CTL_EN_NONFATAL | PCI_EXP_DPC_CTL_INT_EN); pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl); - - free_irq(dev->irq, dpc); - kfree(dpc); } static struct pcie_port_service_driver dpcdriver = { .name = "dpc", - .port_type = PCI_EXP_TYPE_ROOT_PORT | PCI_EXP_TYPE_DOWNSTREAM, + .port_type = PCIE_ANY_PORT, .service = PCIE_PORT_SERVICE_DPC, .probe = dpc_probe, .remove = dpc_remove, diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index 32d4d0a3d20e..e9270b4026f3 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -11,6 +11,7 @@ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/pm.h> +#include <linux/pm_runtime.h> #include <linux/string.h> #include <linux/slab.h> #include <linux/pcieport_if.h> @@ -342,6 +343,8 @@ static int pcie_device_init(struct pci_dev *pdev, int service, int irq) return retval; } + pm_runtime_no_callbacks(device); + return 0; } diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index be35da2e105e..70d7ad8c6d17 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -93,6 +93,26 @@ static int pcie_port_resume_noirq(struct device *dev) return 0; } +static int pcie_port_runtime_suspend(struct device *dev) +{ + return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY; +} + +static int pcie_port_runtime_resume(struct device *dev) +{ + return 0; +} + +static int pcie_port_runtime_idle(struct device *dev) +{ + /* + * Assume the PCI core has set bridge_d3 whenever it thinks the port + * should be good to go to D3. Everything else, including moving + * the port to D3, is handled by the PCI core. + */ + return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY; +} + static const struct dev_pm_ops pcie_portdrv_pm_ops = { .suspend = pcie_port_device_suspend, .resume = pcie_port_device_resume, @@ -101,6 +121,9 @@ static const struct dev_pm_ops pcie_portdrv_pm_ops = { .poweroff = pcie_port_device_suspend, .restore = pcie_port_device_resume, .resume_noirq = pcie_port_resume_noirq, + .runtime_suspend = pcie_port_runtime_suspend, + .runtime_resume = pcie_port_runtime_resume, + .runtime_idle = pcie_port_runtime_idle, }; #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops) @@ -134,16 +157,39 @@ static int pcie_portdrv_probe(struct pci_dev *dev, return status; pci_save_state(dev); + /* - * D3cold may not work properly on some PCIe port, so disable - * it by default. + * Prevent runtime PM if the port is advertising support for PCIe + * hotplug. Otherwise the BIOS hotplug SMI code might not be able + * to enumerate devices behind this port properly (the port is + * powered down preventing all config space accesses to the + * subordinate devices). We can't be sure for native PCIe hotplug + * either so prevent that as well. */ - dev->d3cold_allowed = false; + if (!dev->is_hotplug_bridge) { + /* + * Keep the port resumed 100ms to make sure things like + * config space accesses from userspace (lspci) will not + * cause the port to repeatedly suspend and resume. + */ + pm_runtime_set_autosuspend_delay(&dev->dev, 100); + pm_runtime_use_autosuspend(&dev->dev); + pm_runtime_mark_last_busy(&dev->dev); + pm_runtime_put_autosuspend(&dev->dev); + pm_runtime_allow(&dev->dev); + } + return 0; } static void pcie_portdrv_remove(struct pci_dev *dev) { + if (!dev->is_hotplug_bridge) { + pm_runtime_forbid(&dev->dev); + pm_runtime_get_noresume(&dev->dev); + pm_runtime_dont_use_autosuspend(&dev->dev); + } + pcie_port_device_remove(dev); } |