diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 252 |
1 files changed, 210 insertions, 42 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 7904d02..b01bd5b 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -66,7 +66,8 @@ static void pci_dev_d3_sleep(struct pci_dev *dev) if (delay < pci_pm_d3_delay) delay = pci_pm_d3_delay; - msleep(delay); + if (delay) + msleep(delay); } #ifdef CONFIG_PCI_DOMAINS @@ -827,7 +828,8 @@ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) * because have already delayed for the bridge. */ if (dev->runtime_d3cold) { - msleep(dev->d3cold_delay); + if (dev->d3cold_delay) + msleep(dev->d3cold_delay); /* * When powering on a bridge from D3cold, the * whole hierarchy may be powered on into @@ -1782,8 +1784,8 @@ static void pci_pme_list_scan(struct work_struct *work) } } if (!list_empty(&pci_pme_list)) - schedule_delayed_work(&pci_pme_work, - msecs_to_jiffies(PME_TIMEOUT)); + queue_delayed_work(system_freezable_wq, &pci_pme_work, + msecs_to_jiffies(PME_TIMEOUT)); mutex_unlock(&pci_pme_list_mutex); } @@ -1848,8 +1850,9 @@ void pci_pme_active(struct pci_dev *dev, bool enable) mutex_lock(&pci_pme_list_mutex); list_add(&pme_dev->list, &pci_pme_list); if (list_is_singular(&pci_pme_list)) - schedule_delayed_work(&pci_pme_work, - msecs_to_jiffies(PME_TIMEOUT)); + queue_delayed_work(system_freezable_wq, + &pci_pme_work, + msecs_to_jiffies(PME_TIMEOUT)); mutex_unlock(&pci_pme_list_mutex); } else { mutex_lock(&pci_pme_list_mutex); @@ -3363,7 +3366,7 @@ unsigned long __weak pci_address_to_pio(phys_addr_t address) * Only architectures that have memory mapped IO functions defined * (and the PCI_IOBASE value defined) should call this function. */ -int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr) +int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr) { #if defined(PCI_IOBASE) && defined(CONFIG_MMU) unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start; @@ -3383,6 +3386,7 @@ int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr) return -ENODEV; #endif } +EXPORT_SYMBOL(pci_remap_iospace); /** * pci_unmap_iospace - Unmap the memory mapped I/O space @@ -3400,6 +3404,89 @@ void pci_unmap_iospace(struct resource *res) unmap_kernel_range(vaddr, resource_size(res)); #endif } +EXPORT_SYMBOL(pci_unmap_iospace); + +/** + * devm_pci_remap_cfgspace - Managed pci_remap_cfgspace() + * @dev: Generic device to remap IO address for + * @offset: Resource address to map + * @size: Size of map + * + * Managed pci_remap_cfgspace(). Map is automatically unmapped on driver + * detach. + */ +void __iomem *devm_pci_remap_cfgspace(struct device *dev, + resource_size_t offset, + resource_size_t size) +{ + void __iomem **ptr, *addr; + + ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return NULL; + + addr = pci_remap_cfgspace(offset, size); + if (addr) { + *ptr = addr; + devres_add(dev, ptr); + } else + devres_free(ptr); + + return addr; +} +EXPORT_SYMBOL(devm_pci_remap_cfgspace); + +/** + * devm_pci_remap_cfg_resource - check, request region and ioremap cfg resource + * @dev: generic device to handle the resource for + * @res: configuration space resource to be handled + * + * Checks that a resource is a valid memory region, requests the memory + * region and ioremaps with pci_remap_cfgspace() API that ensures the + * proper PCI configuration space memory attributes are guaranteed. + * + * All operations are managed and will be undone on driver detach. + * + * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code + * on failure. Usage example: + * + * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + * base = devm_pci_remap_cfg_resource(&pdev->dev, res); + * if (IS_ERR(base)) + * return PTR_ERR(base); + */ +void __iomem *devm_pci_remap_cfg_resource(struct device *dev, + struct resource *res) +{ + resource_size_t size; + const char *name; + void __iomem *dest_ptr; + + BUG_ON(!dev); + + if (!res || resource_type(res) != IORESOURCE_MEM) { + dev_err(dev, "invalid resource\n"); + return IOMEM_ERR_PTR(-EINVAL); + } + + size = resource_size(res); + name = res->name ?: dev_name(dev); + + if (!devm_request_mem_region(dev, res->start, size, name)) { + dev_err(dev, "can't request region for resource %pR\n", res); + return IOMEM_ERR_PTR(-EBUSY); + } + + dest_ptr = devm_pci_remap_cfgspace(dev, res->start, size); + if (!dest_ptr) { + dev_err(dev, "ioremap failed for resource %pR\n", res); + devm_release_mem_region(dev, res->start, size); + dest_ptr = IOMEM_ERR_PTR(-ENOMEM); + } + + return dest_ptr; +} +EXPORT_SYMBOL(devm_pci_remap_cfg_resource); static void __pci_set_master(struct pci_dev *dev, bool enable) { @@ -3773,24 +3860,41 @@ static void pci_flr_wait(struct pci_dev *dev) (i - 1) * 100); } -static int pcie_flr(struct pci_dev *dev, int probe) +/** + * pcie_has_flr - check if a device supports function level resets + * @dev: device to check + * + * Returns true if the device advertises support for PCIe function level + * resets. + */ +static bool pcie_has_flr(struct pci_dev *dev) { u32 cap; - pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); - if (!(cap & PCI_EXP_DEVCAP_FLR)) - return -ENOTTY; + if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) + return false; - if (probe) - return 0; + pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); + return cap & PCI_EXP_DEVCAP_FLR; +} +/** + * pcie_flr - initiate a PCIe function level reset + * @dev: device to reset + * + * Initiate a function level reset on @dev. The caller should ensure the + * device supports FLR before calling this function, e.g. by using the + * pcie_has_flr() helper. + */ +void pcie_flr(struct pci_dev *dev) +{ if (!pci_wait_for_pending_transaction(dev)) dev_err(&dev->dev, "timed out waiting for pending transaction; performing function level reset anyway\n"); pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR); pci_flr_wait(dev); - return 0; } +EXPORT_SYMBOL_GPL(pcie_flr); static int pci_af_flr(struct pci_dev *dev, int probe) { @@ -3801,6 +3905,9 @@ static int pci_af_flr(struct pci_dev *dev, int probe) if (!pos) return -ENOTTY; + if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) + return -ENOTTY; + pci_read_config_byte(dev, pos + PCI_AF_CAP, &cap); if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR)) return -ENOTTY; @@ -3971,9 +4078,12 @@ static int __pci_dev_reset(struct pci_dev *dev, int probe) if (rc != -ENOTTY) goto done; - rc = pcie_flr(dev, probe); - if (rc != -ENOTTY) + if (pcie_has_flr(dev)) { + if (!probe) + pcie_flr(dev); + rc = 0; goto done; + } rc = pci_af_flr(dev, probe); if (rc != -ENOTTY) @@ -4932,6 +5042,8 @@ bool pci_device_is_present(struct pci_dev *pdev) { u32 v; + if (pci_dev_is_disconnected(pdev)) + return false; return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0); } EXPORT_SYMBOL_GPL(pci_device_is_present); @@ -4947,6 +5059,11 @@ void pci_ignore_hotplug(struct pci_dev *dev) } EXPORT_SYMBOL_GPL(pci_ignore_hotplug); +resource_size_t __weak pcibios_default_alignment(void) +{ + return 0; +} + #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0}; static DEFINE_SPINLOCK(resource_alignment_lock); @@ -4954,22 +5071,25 @@ static DEFINE_SPINLOCK(resource_alignment_lock); /** * pci_specified_resource_alignment - get resource alignment specified by user. * @dev: the PCI device to get + * @resize: whether or not to change resources' size when reassigning alignment * * RETURNS: Resource alignment if it is specified. * Zero if it is not specified. */ -static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev) +static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev, + bool *resize) { int seg, bus, slot, func, align_order, count; unsigned short vendor, device, subsystem_vendor, subsystem_device; - resource_size_t align = 0; + resource_size_t align = pcibios_default_alignment(); char *p; spin_lock(&resource_alignment_lock); p = resource_alignment_param; - if (!*p) + if (!*p && !align) goto out; if (pci_has_flag(PCI_PROBE_ONLY)) { + align = 0; pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n"); goto out; } @@ -4999,6 +5119,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev) (!device || (device == dev->device)) && (!subsystem_vendor || (subsystem_vendor == dev->subsystem_vendor)) && (!subsystem_device || (subsystem_device == dev->subsystem_device))) { + *resize = true; if (align_order == -1) align = PAGE_SIZE; else @@ -5024,6 +5145,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev) bus == dev->bus->number && slot == PCI_SLOT(dev->devfn) && func == PCI_FUNC(dev->devfn)) { + *resize = true; if (align_order == -1) align = PAGE_SIZE; else @@ -5043,6 +5165,68 @@ out: return align; } +static void pci_request_resource_alignment(struct pci_dev *dev, int bar, + resource_size_t align, bool resize) +{ + struct resource *r = &dev->resource[bar]; + resource_size_t size; + + if (!(r->flags & IORESOURCE_MEM)) + return; + + if (r->flags & IORESOURCE_PCI_FIXED) { + dev_info(&dev->dev, "BAR%d %pR: ignoring requested alignment %#llx\n", + bar, r, (unsigned long long)align); + return; + } + + size = resource_size(r); + if (size >= align) + return; + + /* + * Increase the alignment of the resource. There are two ways we + * can do this: + * + * 1) Increase the size of the resource. BARs are aligned on their + * size, so when we reallocate space for this resource, we'll + * allocate it with the larger alignment. This also prevents + * assignment of any other BARs inside the alignment region, so + * if we're requesting page alignment, this means no other BARs + * will share the page. + * + * The disadvantage is that this makes the resource larger than + * the hardware BAR, which may break drivers that compute things + * based on the resource size, e.g., to find registers at a + * fixed offset before the end of the BAR. + * + * 2) Retain the resource size, but use IORESOURCE_STARTALIGN and + * set r->start to the desired alignment. By itself this + * doesn't prevent other BARs being put inside the alignment + * region, but if we realign *every* resource of every device in + * the system, none of them will share an alignment region. + * + * When the user has requested alignment for only some devices via + * the "pci=resource_alignment" argument, "resize" is true and we + * use the first method. Otherwise we assume we're aligning all + * devices and we use the second. + */ + + dev_info(&dev->dev, "BAR%d %pR: requesting alignment to %#llx\n", + bar, r, (unsigned long long)align); + + if (resize) { + r->start = 0; + r->end = align - 1; + } else { + r->flags &= ~IORESOURCE_SIZEALIGN; + r->flags |= IORESOURCE_STARTALIGN; + r->start = align; + r->end = r->start + size - 1; + } + r->flags |= IORESOURCE_UNSET; +} + /* * This function disables memory decoding and releases memory resources * of the device specified by kernel's boot parameter 'pci=resource_alignment='. @@ -5054,8 +5238,9 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev) { int i; struct resource *r; - resource_size_t align, size; + resource_size_t align; u16 command; + bool resize = false; /* * VF BARs are read-only zero according to SR-IOV spec r1.1, sec @@ -5067,7 +5252,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev) return; /* check if specified PCI is target device to reassign */ - align = pci_specified_resource_alignment(dev); + align = pci_specified_resource_alignment(dev, &resize); if (!align) return; @@ -5084,28 +5269,11 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev) command &= ~PCI_COMMAND_MEMORY; pci_write_config_word(dev, PCI_COMMAND, command); - for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) { - r = &dev->resource[i]; - if (!(r->flags & IORESOURCE_MEM)) - continue; - if (r->flags & IORESOURCE_PCI_FIXED) { - dev_info(&dev->dev, "Ignoring requested alignment for BAR%d: %pR\n", - i, r); - continue; - } + for (i = 0; i <= PCI_ROM_RESOURCE; i++) + pci_request_resource_alignment(dev, i, align, resize); - size = resource_size(r); - if (size < align) { - size = align; - dev_info(&dev->dev, - "Rounding up size of resource #%d to %#llx.\n", - i, (unsigned long long)size); - } - r->flags |= IORESOURCE_UNSET; - r->end = size - 1; - r->start = 0; - } - /* Need to disable bridge's resource window, + /* + * Need to disable bridge's resource window, * to enable the kernel to reassign new resource * window later on. */ |
