diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 92 |
1 files changed, 32 insertions, 60 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 5cb5820fae4..b099e0025d2 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -450,7 +450,7 @@ static struct pci_platform_pm_ops *pci_platform_pm; int pci_set_platform_pm(struct pci_platform_pm_ops *ops) { if (!ops->is_manageable || !ops->set_state || !ops->choose_state - || !ops->sleep_wake || !ops->can_wakeup) + || !ops->sleep_wake) return -EINVAL; pci_platform_pm = ops; return 0; @@ -473,11 +473,6 @@ static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev) pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR; } -static inline bool platform_pci_can_wakeup(struct pci_dev *dev) -{ - return pci_platform_pm ? pci_platform_pm->can_wakeup(dev) : false; -} - static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable) { return pci_platform_pm ? @@ -847,9 +842,8 @@ static struct pci_cap_saved_state *pci_find_saved_cap( struct pci_dev *pci_dev, char cap) { struct pci_cap_saved_state *tmp; - struct hlist_node *pos; - hlist_for_each_entry(tmp, pos, &pci_dev->saved_cap_space, next) { + hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) { if (tmp->cap.cap_nr == cap) return tmp; } @@ -1046,7 +1040,6 @@ struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) struct pci_saved_state *state; struct pci_cap_saved_state *tmp; struct pci_cap_saved_data *cap; - struct hlist_node *pos; size_t size; if (!dev->state_saved) @@ -1054,7 +1047,7 @@ struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) size = sizeof(*state) + sizeof(struct pci_cap_saved_data); - hlist_for_each_entry(tmp, pos, &dev->saved_cap_space, next) + hlist_for_each_entry(tmp, &dev->saved_cap_space, next) size += sizeof(struct pci_cap_saved_data) + tmp->cap.size; state = kzalloc(size, GFP_KERNEL); @@ -1065,7 +1058,7 @@ struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) sizeof(state->config_space)); cap = state->cap; - hlist_for_each_entry(tmp, pos, &dev->saved_cap_space, next) { + hlist_for_each_entry(tmp, &dev->saved_cap_space, next) { size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size; memcpy(cap, &tmp->cap, len); cap = (struct pci_cap_saved_data *)((u8 *)cap + len); @@ -1156,8 +1149,7 @@ int pci_reenable_device(struct pci_dev *dev) return 0; } -static int __pci_enable_device_flags(struct pci_dev *dev, - resource_size_t flags) +static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags) { int err; int i, bars = 0; @@ -1174,7 +1166,7 @@ static int __pci_enable_device_flags(struct pci_dev *dev, dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); } - if (atomic_add_return(1, &dev->enable_cnt) > 1) + if (atomic_inc_return(&dev->enable_cnt) > 1) return 0; /* already enabled */ /* only skip sriov related */ @@ -1201,7 +1193,7 @@ static int __pci_enable_device_flags(struct pci_dev *dev, */ int pci_enable_device_io(struct pci_dev *dev) { - return __pci_enable_device_flags(dev, IORESOURCE_IO); + return pci_enable_device_flags(dev, IORESOURCE_IO); } /** @@ -1214,7 +1206,7 @@ int pci_enable_device_io(struct pci_dev *dev) */ int pci_enable_device_mem(struct pci_dev *dev) { - return __pci_enable_device_flags(dev, IORESOURCE_MEM); + return pci_enable_device_flags(dev, IORESOURCE_MEM); } /** @@ -1230,7 +1222,7 @@ int pci_enable_device_mem(struct pci_dev *dev) */ int pci_enable_device(struct pci_dev *dev) { - return __pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); + return pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); } /* @@ -1401,7 +1393,10 @@ pci_disable_device(struct pci_dev *dev) if (dr) dr->enabled = 0; - if (atomic_sub_return(1, &dev->enable_cnt) != 0) + dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0, + "disabling already-disabled device"); + + if (atomic_dec_return(&dev->enable_cnt) != 0) return; do_pci_disable_device(dev); @@ -1985,25 +1980,6 @@ void pci_pm_init(struct pci_dev *dev) } } -/** - * platform_pci_wakeup_init - init platform wakeup if present - * @dev: PCI device - * - * Some devices don't have PCI PM caps but can still generate wakeup - * events through platform methods (like ACPI events). If @dev supports - * platform wakeup events, set the device flag to indicate as much. This - * may be redundant if the device also supports PCI PM caps, but double - * initialization should be safe in that case. - */ -void platform_pci_wakeup_init(struct pci_dev *dev) -{ - if (!platform_pci_can_wakeup(dev)) - return; - - device_set_wakeup_capable(&dev->dev, true); - platform_pci_sleep_wake(dev, false); -} - static void pci_add_saved_cap(struct pci_dev *pci_dev, struct pci_cap_saved_state *new_cap) { @@ -2060,17 +2036,20 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) void pci_free_cap_save_buffers(struct pci_dev *dev) { struct pci_cap_saved_state *tmp; - struct hlist_node *pos, *n; + struct hlist_node *n; - hlist_for_each_entry_safe(tmp, pos, n, &dev->saved_cap_space, next) + hlist_for_each_entry_safe(tmp, n, &dev->saved_cap_space, next) kfree(tmp); } /** - * pci_enable_ari - enable ARI forwarding if hardware support it + * pci_configure_ari - enable or disable ARI forwarding * @dev: the PCI device + * + * If @dev and its upstream bridge both support ARI, enable ARI in the + * bridge. Otherwise, disable ARI in the bridge. */ -void pci_enable_ari(struct pci_dev *dev) +void pci_configure_ari(struct pci_dev *dev) { u32 cap; struct pci_dev *bridge; @@ -2078,9 +2057,6 @@ void pci_enable_ari(struct pci_dev *dev) if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn) return; - if (!pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) - return; - bridge = dev->bus->self; if (!bridge) return; @@ -2089,8 +2065,15 @@ void pci_enable_ari(struct pci_dev *dev) if (!(cap & PCI_EXP_DEVCAP2_ARI)) return; - pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2, PCI_EXP_DEVCTL2_ARI); - bridge->ari_enabled = 1; + if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) { + pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2, + PCI_EXP_DEVCTL2_ARI); + bridge->ari_enabled = 1; + } else { + pcie_capability_clear_word(bridge, PCI_EXP_DEVCTL2, + PCI_EXP_DEVCTL2_ARI); + bridge->ari_enabled = 0; + } } /** @@ -3766,18 +3749,6 @@ resource_size_t pci_specified_resource_alignment(struct pci_dev *dev) return align; } -/** - * pci_is_reassigndev - check if specified PCI is target device to reassign - * @dev: the PCI device to check - * - * RETURNS: non-zero for PCI device is a target device to reassign, - * or zero is not. - */ -int pci_is_reassigndev(struct pci_dev *dev) -{ - return (pci_specified_resource_alignment(dev) != 0); -} - /* * This function disables memory decoding and releases memory resources * of the device specified by kernel's boot parameter 'pci=resource_alignment='. @@ -3792,7 +3763,9 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev) resource_size_t align, size; u16 command; - if (!pci_is_reassigndev(dev)) + /* check if specified PCI is target device to reassign */ + align = pci_specified_resource_alignment(dev); + if (!align) return; if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL && @@ -3808,7 +3781,6 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev) command &= ~PCI_COMMAND_MEMORY; pci_write_config_word(dev, PCI_COMMAND, command); - align = pci_specified_resource_alignment(dev); for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) { r = &dev->resource[i]; if (!(r->flags & IORESOURCE_MEM)) |