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Change the type of probe argument in functions which implement reset methods from int to pci_reset_mode_t to make the intent clear. Add a new line in return statement of pci_reset_bus_function. Suggested-by: Alex Williamson Suggested-by: Krzysztof WilczyƄski Signed-off-by: Amey Narkhede --- drivers/crypto/cavium/nitrox/nitrox_main.c | 2 +- .../ethernet/cavium/liquidio/lio_vf_main.c | 2 +- drivers/pci/hotplug/pciehp.h | 2 +- drivers/pci/hotplug/pciehp_hpc.c | 4 +- drivers/pci/pci.c | 94 ++++++++++++------- drivers/pci/pci.h | 8 +- drivers/pci/pcie/aer.c | 2 +- drivers/pci/quirks.c | 37 ++++---- include/linux/pci.h | 8 +- include/linux/pci_hotplug.h | 2 +- 10 files changed, 98 insertions(+), 63 deletions(-) diff --git a/drivers/crypto/cavium/nitrox/nitrox_main.c b/drivers/crypto/cavium/nitrox/nitrox_main.c index 15d6c8452..f97fa8e99 100644 --- a/drivers/crypto/cavium/nitrox/nitrox_main.c +++ b/drivers/crypto/cavium/nitrox/nitrox_main.c @@ -306,7 +306,7 @@ static int nitrox_device_flr(struct pci_dev *pdev) return -ENOMEM; } - pcie_reset_flr(pdev, 0); + pcie_reset_flr(pdev, PCI_RESET_DO_RESET); pci_restore_state(pdev); diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c index 336d149ee..6e666be69 100644 --- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c +++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c @@ -526,7 +526,7 @@ static void octeon_destroy_resources(struct octeon_device *oct) oct->irq_name_storage = NULL; } /* Soft reset the octeon device before exiting */ - if (!pcie_reset_flr(oct->pci_dev, 1)) + if (!pcie_reset_flr(oct->pci_dev, PCI_RESET_PROBE)) octeon_pci_flr(oct); else cn23xx_vf_ask_pf_to_do_flr(oct); diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index 4fd200d8b..87da03adc 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -181,7 +181,7 @@ void pciehp_release_ctrl(struct controller *ctrl); int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot); int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot); -int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, int probe); +int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, pci_reset_mode_t mode); int pciehp_get_attention_status(struct hotplug_slot *hotplug_slot, u8 *status); int pciehp_set_raw_indicator_status(struct hotplug_slot *h_slot, u8 status); int pciehp_get_raw_indicator_status(struct hotplug_slot *h_slot, u8 *status); diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index fb3840e22..24b3c8787 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -834,14 +834,14 @@ void pcie_disable_interrupt(struct controller *ctrl) * momentarily, if we see that they could interfere. Also, clear any spurious * events after. */ -int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, int probe) +int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, pci_reset_mode_t mode) { struct controller *ctrl = to_ctrl(hotplug_slot); struct pci_dev *pdev = ctrl_dev(ctrl); u16 stat_mask = 0, ctrl_mask = 0; int rc; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; down_write(&ctrl->reset_lock); diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 4a7019d0b..f2ecdfcf9 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4650,14 +4650,17 @@ EXPORT_SYMBOL_GPL(pcie_flr); /** * pcie_reset_flr - initiate a PCIe function level reset * @dev: device to reset - * @probe: If set, only check if the device can be reset this way. + * @mode: If PCI_RESET_PROBE, only check if the device can be reset this way. * * Initiate a function level reset on @dev. */ -int pcie_reset_flr(struct pci_dev *dev, int probe) +int pcie_reset_flr(struct pci_dev *dev, pci_reset_mode_t mode) { u32 cap; + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) return -ENOTTY; @@ -4665,18 +4668,21 @@ int pcie_reset_flr(struct pci_dev *dev, int probe) if (!(cap & PCI_EXP_DEVCAP_FLR)) return -ENOTTY; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; return pcie_flr(dev); } EXPORT_SYMBOL_GPL(pcie_reset_flr); -static int pci_af_flr(struct pci_dev *dev, int probe) +static int pci_af_flr(struct pci_dev *dev, pci_reset_mode_t mode) { int pos; u8 cap; + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + pos = pci_find_capability(dev, PCI_CAP_ID_AF); if (!pos) return -ENOTTY; @@ -4688,7 +4694,7 @@ static int pci_af_flr(struct pci_dev *dev, int probe) if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR)) return -ENOTTY; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; /* @@ -4719,7 +4725,7 @@ static int pci_af_flr(struct pci_dev *dev, int probe) /** * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0. * @dev: Device to reset. - * @probe: If set, only check if the device can be reset this way. + * @mode: If PCI_RESET_PROBE, only check if the device can be reset this way. * * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is * unset, it will be reinitialized internally when going from PCI_D3hot to @@ -4731,10 +4737,13 @@ static int pci_af_flr(struct pci_dev *dev, int probe) * by default (i.e. unless the @dev's d3hot_delay field has a different value). * Moreover, only devices in D0 can be reset by this function. */ -static int pci_pm_reset(struct pci_dev *dev, int probe) +static int pci_pm_reset(struct pci_dev *dev, pci_reset_mode_t mode) { u16 csr; + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + if (!dev->pm_cap || dev->dev_flags & PCI_DEV_FLAGS_NO_PM_RESET) return -ENOTTY; @@ -4742,7 +4751,7 @@ static int pci_pm_reset(struct pci_dev *dev, int probe) if (csr & PCI_PM_CTRL_NO_SOFT_RESET) return -ENOTTY; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; if (dev->current_state != PCI_D0) @@ -4991,10 +5000,13 @@ int pci_bridge_secondary_bus_reset(struct pci_dev *dev) } EXPORT_SYMBOL_GPL(pci_bridge_secondary_bus_reset); -static int pci_parent_bus_reset(struct pci_dev *dev, int probe) +static int pci_parent_bus_reset(struct pci_dev *dev, pci_reset_mode_t mode) { struct pci_dev *pdev; + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + if (pci_is_root_bus(dev->bus) || dev->subordinate || !dev->bus->self || dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET) return -ENOTTY; @@ -5003,44 +5015,47 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe) if (pdev != dev) return -ENOTTY; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; return pci_bridge_secondary_bus_reset(dev->bus->self); } -static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe) +static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, pci_reset_mode_t mode) { int rc = -ENOTTY; + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + if (!hotplug || !try_module_get(hotplug->owner)) return rc; if (hotplug->ops->reset_slot) - rc = hotplug->ops->reset_slot(hotplug, probe); + rc = hotplug->ops->reset_slot(hotplug, mode); module_put(hotplug->owner); return rc; } -static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe) +static int pci_dev_reset_slot_function(struct pci_dev *dev, pci_reset_mode_t mode) { if (dev->multifunction || dev->subordinate || !dev->slot || dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET) return -ENOTTY; - return pci_reset_hotplug_slot(dev->slot->hotplug, probe); + return pci_reset_hotplug_slot(dev->slot->hotplug, mode); } -static int pci_reset_bus_function(struct pci_dev *dev, int probe) +static int pci_reset_bus_function(struct pci_dev *dev, pci_reset_mode_t mode) { int rc; - rc = pci_dev_reset_slot_function(dev, probe); + rc = pci_dev_reset_slot_function(dev, mode); if (rc != -ENOTTY) return rc; - return pci_parent_bus_reset(dev, probe); + return pci_parent_bus_reset(dev, mode); } static void pci_dev_lock(struct pci_dev *dev) @@ -5118,19 +5133,22 @@ static void pci_dev_restore(struct pci_dev *dev) /** * pci_dev_acpi_reset - do a function level reset using _RST method * @dev: device to reset - * @probe: check if _RST method is included in the acpi_device context. + * @mode: check if _RST method is included in the acpi_device context. */ -static int pci_dev_acpi_reset(struct pci_dev *dev, int probe) +static int pci_dev_acpi_reset(struct pci_dev *dev, pci_reset_mode_t mode) { #ifdef CONFIG_ACPI acpi_handle handle = ACPI_HANDLE(&dev->dev); + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + /* Return -ENOTTY if _RST method is not included in the dev context */ if (!handle || !acpi_has_method(handle, "_RST")) return -ENOTTY; /* Return 0 for probe phase indicating that we can reset this device */ - if (probe) + if (mode == PCI_RESET_PROBE) return 0; /* Invoke _RST() method to perform a function level reset */ @@ -5196,7 +5214,7 @@ int __pci_reset_function_locked(struct pci_dev *dev) * other error, we're also finished: this indicates that further * reset mechanisms might be broken on the device. */ - rc = pci_reset_fn_methods[i].reset_fn(dev, 0); + rc = pci_reset_fn_methods[i].reset_fn(dev, PCI_RESET_DO_RESET); if (rc != -ENOTTY) return rc; break; @@ -5232,7 +5250,7 @@ void pci_init_reset_methods(struct pci_dev *dev) might_sleep(); for (i = 0; i < PCI_RESET_METHODS_NUM; i++) { - rc = pci_reset_fn_methods[i].reset_fn(dev, 1); + rc = pci_reset_fn_methods[i].reset_fn(dev, PCI_RESET_PROBE); if (!rc) reset_methods[i] = prio--; else if (rc != -ENOTTY) @@ -5548,21 +5566,24 @@ static void pci_slot_restore_locked(struct pci_slot *slot) } } -static int pci_slot_reset(struct pci_slot *slot, int probe) +static int pci_slot_reset(struct pci_slot *slot, pci_reset_mode_t mode) { int rc; + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + if (!slot || !pci_slot_resetable(slot)) return -ENOTTY; - if (!probe) + if (mode != PCI_RESET_PROBE) pci_slot_lock(slot); might_sleep(); - rc = pci_reset_hotplug_slot(slot->hotplug, probe); + rc = pci_reset_hotplug_slot(slot->hotplug, mode); - if (!probe) + if (mode != PCI_RESET_PROBE) pci_slot_unlock(slot); return rc; @@ -5576,7 +5597,7 @@ static int pci_slot_reset(struct pci_slot *slot, int probe) */ int pci_probe_reset_slot(struct pci_slot *slot) { - return pci_slot_reset(slot, 1); + return pci_slot_reset(slot, PCI_RESET_PROBE); } EXPORT_SYMBOL_GPL(pci_probe_reset_slot); @@ -5599,14 +5620,14 @@ static int __pci_reset_slot(struct pci_slot *slot) { int rc; - rc = pci_slot_reset(slot, 1); + rc = pci_slot_reset(slot, PCI_RESET_PROBE); if (rc) return rc; if (pci_slot_trylock(slot)) { pci_slot_save_and_disable_locked(slot); might_sleep(); - rc = pci_reset_hotplug_slot(slot->hotplug, 0); + rc = pci_reset_hotplug_slot(slot->hotplug, PCI_RESET_DO_RESET); pci_slot_restore_locked(slot); pci_slot_unlock(slot); } else @@ -5615,14 +5636,17 @@ static int __pci_reset_slot(struct pci_slot *slot) return rc; } -static int pci_bus_reset(struct pci_bus *bus, int probe) +static int pci_bus_reset(struct pci_bus *bus, pci_reset_mode_t mode) { int ret; + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + if (!bus->self || !pci_bus_resetable(bus)) return -ENOTTY; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; pci_bus_lock(bus); @@ -5661,14 +5685,14 @@ int pci_bus_error_reset(struct pci_dev *bridge) goto bus_reset; list_for_each_entry(slot, &bus->slots, list) - if (pci_slot_reset(slot, 0)) + if (pci_slot_reset(slot, PCI_RESET_DO_RESET)) goto bus_reset; mutex_unlock(&pci_slot_mutex); return 0; bus_reset: mutex_unlock(&pci_slot_mutex); - return pci_bus_reset(bridge->subordinate, 0); + return pci_bus_reset(bridge->subordinate, PCI_RESET_DO_RESET); } /** @@ -5679,7 +5703,7 @@ int pci_bus_error_reset(struct pci_dev *bridge) */ int pci_probe_reset_bus(struct pci_bus *bus) { - return pci_bus_reset(bus, 1); + return pci_bus_reset(bus, PCI_RESET_PROBE); } EXPORT_SYMBOL_GPL(pci_probe_reset_bus); @@ -5693,7 +5717,7 @@ static int __pci_reset_bus(struct pci_bus *bus) { int rc; - rc = pci_bus_reset(bus, 1); + rc = pci_bus_reset(bus, PCI_RESET_PROBE); if (rc) return rc; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 13ec6bd6f..67fb10e50 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -603,19 +603,19 @@ static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity) struct pci_dev_reset_methods { u16 vendor; u16 device; - int (*reset)(struct pci_dev *dev, int probe); + int (*reset)(struct pci_dev *dev, pci_reset_mode_t mode); }; struct pci_reset_fn_method { - int (*reset_fn)(struct pci_dev *pdev, int probe); + int (*reset_fn)(struct pci_dev *pdev, pci_reset_mode_t mode); char *name; }; extern const struct pci_reset_fn_method pci_reset_fn_methods[]; #ifdef CONFIG_PCI_QUIRKS -int pci_dev_specific_reset(struct pci_dev *dev, int probe); +int pci_dev_specific_reset(struct pci_dev *dev, pci_reset_mode_t mode); #else -static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe) +static inline int pci_dev_specific_reset(struct pci_dev *dev, pci_reset_mode_t mode) { return -ENOTTY; } diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index 98077595a..cfa7a1775 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -1405,7 +1405,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) } if (type == PCI_EXP_TYPE_RC_EC || type == PCI_EXP_TYPE_RC_END) { - rc = pcie_reset_flr(dev, 0); + rc = pcie_reset_flr(dev, PCI_RESET_DO_RESET); if (!rc) pci_info(dev, "has been reset\n"); else diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 45a8c3caa..60fd101ac 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -3681,7 +3681,7 @@ DECLARE_PCI_FIXUP_SUSPEND_LATE(PCI_VENDOR_ID_INTEL, * reset a single function if other methods (e.g. FLR, PM D0->D3) are * not available. */ -static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, int probe) +static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, pci_reset_mode_t mode) { /* * http://www.intel.com/content/dam/doc/datasheet/82599-10-gbe-controller-datasheet.pdf @@ -3691,7 +3691,7 @@ static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, int probe) * Thus we must call pcie_flr() directly without first checking if it is * supported. */ - if (!probe) + if (mode == PCI_RESET_DO_RESET) pcie_flr(dev); return 0; } @@ -3703,13 +3703,13 @@ static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, int probe) #define NSDE_PWR_STATE 0xd0100 #define IGD_OPERATION_TIMEOUT 10000 /* set timeout 10 seconds */ -static int reset_ivb_igd(struct pci_dev *dev, int probe) +static int reset_ivb_igd(struct pci_dev *dev, pci_reset_mode_t mode) { void __iomem *mmio_base; unsigned long timeout; u32 val; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; mmio_base = pci_iomap(dev, 0, 0); @@ -3746,7 +3746,7 @@ static int reset_ivb_igd(struct pci_dev *dev, int probe) } /* Device-specific reset method for Chelsio T4-based adapters */ -static int reset_chelsio_generic_dev(struct pci_dev *dev, int probe) +static int reset_chelsio_generic_dev(struct pci_dev *dev, pci_reset_mode_t mode) { u16 old_command; u16 msix_flags; @@ -3762,7 +3762,7 @@ static int reset_chelsio_generic_dev(struct pci_dev *dev, int probe) * If this is the "probe" phase, return 0 indicating that we can * reset this device. */ - if (probe) + if (mode == PCI_RESET_PROBE) return 0; /* @@ -3824,17 +3824,17 @@ static int reset_chelsio_generic_dev(struct pci_dev *dev, int probe) * Chapter 3: NVMe control registers * Chapter 7.3: Reset behavior */ -static int nvme_disable_and_flr(struct pci_dev *dev, int probe) +static int nvme_disable_and_flr(struct pci_dev *dev, pci_reset_mode_t mode) { void __iomem *bar; u16 cmd; u32 cfg; if (dev->class != PCI_CLASS_STORAGE_EXPRESS || - pcie_reset_flr(dev, 1) || !pci_resource_start(dev, 0)) + pcie_reset_flr(dev, PCI_RESET_PROBE) || !pci_resource_start(dev, 0)) return -ENOTTY; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; bar = pci_iomap(dev, 0, NVME_REG_CC + sizeof(cfg)); @@ -3898,11 +3898,13 @@ static int nvme_disable_and_flr(struct pci_dev *dev, int probe) * device too soon after FLR. A 250ms delay after FLR has heuristically * proven to produce reliably working results for device assignment cases. */ -static int delay_250ms_after_flr(struct pci_dev *dev, int probe) +static int delay_250ms_after_flr(struct pci_dev *dev, pci_reset_mode_t mode) { - int ret = pcie_reset_flr(dev, probe); + int ret; + + ret = pcie_reset_flr(dev, mode); - if (probe) + if (ret || mode == PCI_RESET_PROBE) return ret; msleep(250); @@ -3918,13 +3920,13 @@ static int delay_250ms_after_flr(struct pci_dev *dev, int probe) #define HINIC_OPERATION_TIMEOUT 15000 /* 15 seconds */ /* Device-specific reset method for Huawei Intelligent NIC virtual functions */ -static int reset_hinic_vf_dev(struct pci_dev *pdev, int probe) +static int reset_hinic_vf_dev(struct pci_dev *pdev, pci_reset_mode_t mode) { unsigned long timeout; void __iomem *bar; u32 val; - if (probe) + if (mode == PCI_RESET_PROBE) return 0; bar = pci_iomap(pdev, 0, 0); @@ -3995,16 +3997,19 @@ static const struct pci_dev_reset_methods pci_dev_reset_methods[] = { * because when a host assigns a device to a guest VM, the host may need * to reset the device but probably doesn't have a driver for it. */ -int pci_dev_specific_reset(struct pci_dev *dev, int probe) +int pci_dev_specific_reset(struct pci_dev *dev, pci_reset_mode_t mode) { const struct pci_dev_reset_methods *i; + if (mode >= PCI_RESET_MODE_MAX) + return -EINVAL; + for (i = pci_dev_reset_methods; i->reset; i++) { if ((i->vendor == dev->vendor || i->vendor == (u16)PCI_ANY_ID) && (i->device == dev->device || i->device == (u16)PCI_ANY_ID)) - return i->reset(dev, probe); + return i->reset(dev, mode); } return -ENOTTY; diff --git a/include/linux/pci.h b/include/linux/pci.h index a7f063da2..c46df52e6 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -51,6 +51,12 @@ #define PCI_RESET_METHODS_NUM 6 +typedef enum pci_reset_mode { + PCI_RESET_DO_RESET, + PCI_RESET_PROBE, + PCI_RESET_MODE_MAX, +} pci_reset_mode_t; + /* * The PCI interface treats multi-function devices as independent * devices. The slot/function address of each device is encoded @@ -1230,7 +1236,7 @@ u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev, enum pci_bus_speed *speed, enum pcie_link_width *width); void pcie_print_link_status(struct pci_dev *dev); -int pcie_reset_flr(struct pci_dev *dev, int probe); +int pcie_reset_flr(struct pci_dev *dev, pci_reset_mode_t mode); int pcie_flr(struct pci_dev *dev); bool pci_reset_supported(struct pci_dev *dev); int __pci_reset_function_locked(struct pci_dev *dev); diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h index b482e42d7..9e8da46e7 100644 --- a/include/linux/pci_hotplug.h +++ b/include/linux/pci_hotplug.h @@ -44,7 +44,7 @@ struct hotplug_slot_ops { int (*get_attention_status) (struct hotplug_slot *slot, u8 *value); int (*get_latch_status) (struct hotplug_slot *slot, u8 *value); int (*get_adapter_status) (struct hotplug_slot *slot, u8 *value); - int (*reset_slot) (struct hotplug_slot *slot, int probe); + int (*reset_slot) (struct hotplug_slot *slot, pci_reset_mode_t mode); }; /** -- 2.31.1