diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-acpi.c | 23 | ||||
| -rw-r--r-- | drivers/pci/pci-driver.c | 10 | ||||
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 29 | ||||
| -rw-r--r-- | drivers/pci/pci.c | 114 | ||||
| -rw-r--r-- | drivers/pci/pci.h | 1 | ||||
| -rw-r--r-- | drivers/pci/pcie/portdrv_pci.c | 44 |
6 files changed, 203 insertions, 18 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index a9efebc..e1658af 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -48,6 +48,12 @@ static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context) if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev) return; + if (pci_dev->current_state == PCI_D3cold) { + pci_wakeup_event(pci_dev); + pm_runtime_resume(&pci_dev->dev); + return; + } + if (!pci_dev->pm_cap || !pci_dev->pme_support || pci_check_pme_status(pci_dev)) { if (pci_dev->pme_poll) @@ -187,10 +193,13 @@ acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) { - int acpi_state; + int acpi_state, d_max; - acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, - ACPI_STATE_D3); + if (pdev->no_d3cold) + d_max = ACPI_STATE_D3_HOT; + else + d_max = ACPI_STATE_D3_COLD; + acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max); if (acpi_state < 0) return PCI_POWER_ERROR; @@ -297,7 +306,13 @@ static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) { - if (dev->pme_interrupt) + /* + * Per PCI Express Base Specification Revision 2.0 section + * 5.3.3.2 Link Wakeup, platform support is needed for D3cold + * waking up to power on the main link even if there is PME + * support for D3cold + */ + if (dev->pme_interrupt && !dev->runtime_d3cold) return 0; if (!acpi_pm_device_run_wake(&dev->dev, enable)) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index bf0cee6..ca2e4c7 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -1019,10 +1019,13 @@ static int pci_pm_runtime_suspend(struct device *dev) if (!pm || !pm->runtime_suspend) return -ENOSYS; + pci_dev->no_d3cold = false; error = pm->runtime_suspend(dev); suspend_report_result(pm->runtime_suspend, error); if (error) return error; + if (!pci_dev->d3cold_allowed) + pci_dev->no_d3cold = true; pci_fixup_device(pci_fixup_suspend, pci_dev); @@ -1044,6 +1047,7 @@ static int pci_pm_runtime_suspend(struct device *dev) static int pci_pm_runtime_resume(struct device *dev) { + int rc; struct pci_dev *pci_dev = to_pci_dev(dev); const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; @@ -1054,7 +1058,11 @@ static int pci_pm_runtime_resume(struct device *dev) __pci_enable_wake(pci_dev, PCI_D0, true, false); pci_fixup_device(pci_fixup_resume, pci_dev); - return pm->runtime_resume(dev); + rc = pm->runtime_resume(dev); + + pci_dev->runtime_d3cold = false; + + return rc; } static int pci_pm_runtime_idle(struct device *dev) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 86c63fe..1426db0 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -28,6 +28,7 @@ #include <linux/pci-aspm.h> #include <linux/slab.h> #include <linux/vgaarb.h> +#include <linux/pm_runtime.h> #include "pci.h" static int sysfs_initialized; /* = 0 */ @@ -378,6 +379,31 @@ dev_bus_rescan_store(struct device *dev, struct device_attribute *attr, #endif +#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI) +static ssize_t d3cold_allowed_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pci_dev *pdev = to_pci_dev(dev); + unsigned long val; + + if (strict_strtoul(buf, 0, &val) < 0) + return -EINVAL; + + pdev->d3cold_allowed = !!val; + pm_runtime_resume(dev); + + return count; +} + +static ssize_t d3cold_allowed_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + return sprintf (buf, "%u\n", pdev->d3cold_allowed); +} +#endif + struct device_attribute pci_dev_attrs[] = { __ATTR_RO(resource), __ATTR_RO(vendor), @@ -402,6 +428,9 @@ struct device_attribute pci_dev_attrs[] = { __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store), __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store), #endif +#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI) + __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store), +#endif __ATTR_NULL, }; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 9eae64b..8effb9b 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -622,7 +622,8 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) dev_info(&dev->dev, "Refused to change power state, " "currently in D%d\n", dev->current_state); - /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT + /* + * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning * from D3hot to D0 _may_ perform an internal reset, thereby * going to "D0 Uninitialized" rather than "D0 Initialized". @@ -654,6 +655,16 @@ void pci_update_current_state(struct pci_dev *dev, pci_power_t state) if (dev->pm_cap) { u16 pmcsr; + /* + * Configuration space is not accessible for device in + * D3cold, so just keep or set D3cold for safety + */ + if (dev->current_state == PCI_D3cold) + return; + if (state == PCI_D3cold) { + dev->current_state = PCI_D3cold; + return; + } pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); } else { @@ -694,8 +705,50 @@ static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state) */ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) { - if (state == PCI_D0) + if (state == PCI_D0) { pci_platform_power_transition(dev, PCI_D0); + /* + * Mandatory power management transition delays, see + * PCI Express Base Specification Revision 2.0 Section + * 6.6.1: Conventional Reset. Do not delay for + * devices powered on/off by corresponding bridge, + * because have already delayed for the bridge. + */ + if (dev->runtime_d3cold) { + msleep(dev->d3cold_delay); + /* + * When powering on a bridge from D3cold, the + * whole hierarchy may be powered on into + * D0uninitialized state, resume them to give + * them a chance to suspend again + */ + pci_wakeup_bus(dev->subordinate); + } + } +} + +/** + * __pci_dev_set_current_state - Set current state of a PCI device + * @dev: Device to handle + * @data: pointer to state to be set + */ +static int __pci_dev_set_current_state(struct pci_dev *dev, void *data) +{ + pci_power_t state = *(pci_power_t *)data; + + dev->current_state = state; + return 0; +} + +/** + * __pci_bus_set_current_state - Walk given bus and set current state of devices + * @bus: Top bus of the subtree to walk. + * @state: state to be set + */ +static void __pci_bus_set_current_state(struct pci_bus *bus, pci_power_t state) +{ + if (bus) + pci_walk_bus(bus, __pci_dev_set_current_state, &state); } /** @@ -707,8 +760,15 @@ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) */ int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state) { - return state >= PCI_D0 ? - pci_platform_power_transition(dev, state) : -EINVAL; + int ret; + + if (state < PCI_D0) + return -EINVAL; + ret = pci_platform_power_transition(dev, state); + /* Power off the bridge may power off the whole hierarchy */ + if (!ret && state == PCI_D3cold) + __pci_bus_set_current_state(dev->subordinate, PCI_D3cold); + return ret; } EXPORT_SYMBOL_GPL(__pci_complete_power_transition); @@ -732,8 +792,8 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state) int error; /* bound the state we're entering */ - if (state > PCI_D3hot) - state = PCI_D3hot; + if (state > PCI_D3cold) + state = PCI_D3cold; else if (state < PCI_D0) state = PCI_D0; else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) @@ -748,10 +808,15 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state) /* This device is quirked not to be put into D3, so don't put it in D3 */ - if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) + if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) return 0; - error = pci_raw_set_power_state(dev, state); + /* + * To put device in D3cold, we put device into D3hot in native + * way, then put device into D3cold with platform ops + */ + error = pci_raw_set_power_state(dev, state > PCI_D3hot ? + PCI_D3hot : state); if (!__pci_complete_power_transition(dev, state)) error = 0; @@ -1498,6 +1563,28 @@ void pci_pme_wakeup_bus(struct pci_bus *bus) } /** + * pci_wakeup - Wake up a PCI device + * @dev: Device to handle. + * @ign: ignored parameter + */ +static int pci_wakeup(struct pci_dev *pci_dev, void *ign) +{ + pci_wakeup_event(pci_dev); + pm_request_resume(&pci_dev->dev); + return 0; +} + +/** + * pci_wakeup_bus - Walk given bus and wake up devices on it + * @bus: Top bus of the subtree to walk. + */ +void pci_wakeup_bus(struct pci_bus *bus) +{ + if (bus) + pci_walk_bus(bus, pci_wakeup, NULL); +} + +/** * pci_pme_capable - check the capability of PCI device to generate PME# * @dev: PCI device to handle. * @state: PCI state from which device will issue PME#. @@ -1754,6 +1841,10 @@ int pci_prepare_to_sleep(struct pci_dev *dev) if (target_state == PCI_POWER_ERROR) return -EIO; + /* D3cold during system suspend/hibernate is not supported */ + if (target_state > PCI_D3hot) + target_state = PCI_D3hot; + pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev)); error = pci_set_power_state(dev, target_state); @@ -1791,12 +1882,16 @@ int pci_finish_runtime_suspend(struct pci_dev *dev) if (target_state == PCI_POWER_ERROR) return -EIO; + dev->runtime_d3cold = target_state == PCI_D3cold; + __pci_enable_wake(dev, target_state, true, pci_dev_run_wake(dev)); error = pci_set_power_state(dev, target_state); - if (error) + if (error) { __pci_enable_wake(dev, target_state, true, false); + dev->runtime_d3cold = false; + } return error; } @@ -1866,6 +1961,7 @@ void pci_pm_init(struct pci_dev *dev) dev->pm_cap = pm; dev->d3_delay = PCI_PM_D3_WAIT; + dev->d3cold_delay = PCI_PM_D3COLD_WAIT; dev->d1_support = false; dev->d2_support = false; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index e494347..5cd3dce 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -70,6 +70,7 @@ extern void pci_update_current_state(struct pci_dev *dev, pci_power_t state); extern void pci_disable_enabled_device(struct pci_dev *dev); extern int pci_finish_runtime_suspend(struct pci_dev *dev); extern int __pci_pme_wakeup(struct pci_dev *dev, void *ign); +extern void pci_wakeup_bus(struct pci_bus *bus); extern void pci_pm_init(struct pci_dev *dev); extern void platform_pci_wakeup_init(struct pci_dev *dev); extern void pci_allocate_cap_save_buffers(struct pci_dev *dev); diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index 7c576b9..3a7eefc 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -101,12 +101,48 @@ static int pcie_port_resume_noirq(struct device *dev) } #ifdef CONFIG_PM_RUNTIME -static int pcie_port_runtime_pm(struct device *dev) +struct d3cold_info { + bool no_d3cold; + unsigned int d3cold_delay; +}; + +static int pci_dev_d3cold_info(struct pci_dev *pdev, void *data) +{ + struct d3cold_info *info = data; + + info->d3cold_delay = max_t(unsigned int, pdev->d3cold_delay, + info->d3cold_delay); + if (pdev->no_d3cold) + info->no_d3cold = true; + return 0; +} + +static int pcie_port_runtime_suspend(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct d3cold_info d3cold_info = { + .no_d3cold = false, + .d3cold_delay = PCI_PM_D3_WAIT, + }; + + /* + * If any subordinate device disable D3cold, we should not put + * the port into D3cold. The D3cold delay of port should be + * the max of that of all subordinate devices. + */ + pci_walk_bus(pdev->subordinate, pci_dev_d3cold_info, &d3cold_info); + pdev->no_d3cold = d3cold_info.no_d3cold; + pdev->d3cold_delay = d3cold_info.d3cold_delay; + return 0; +} + +static int pcie_port_runtime_resume(struct device *dev) { return 0; } #else -#define pcie_port_runtime_pm NULL +#define pcie_port_runtime_suspend NULL +#define pcie_port_runtime_resume NULL #endif static const struct dev_pm_ops pcie_portdrv_pm_ops = { @@ -117,8 +153,8 @@ 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_pm, - .runtime_resume = pcie_port_runtime_pm, + .runtime_suspend = pcie_port_runtime_suspend, + .runtime_resume = pcie_port_runtime_resume, }; #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops) |
