| /* |
| * drivers/pci/bus.c |
| * |
| * From setup-res.c, by: |
| * Dave Rusling (david.rusling@reo.mts.dec.com) |
| * David Mosberger (davidm@cs.arizona.edu) |
| * David Miller (davem@redhat.com) |
| * Ivan Kokshaysky (ink@jurassic.park.msu.ru) |
| */ |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/pci.h> |
| #include <linux/errno.h> |
| #include <linux/ioport.h> |
| #include <linux/proc_fs.h> |
| #include <linux/slab.h> |
| |
| #include "pci.h" |
| |
| void pci_add_resource_offset(struct list_head *resources, struct resource *res, |
| resource_size_t offset) |
| { |
| struct resource_entry *entry; |
| |
| entry = resource_list_create_entry(res, 0); |
| if (!entry) { |
| printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res); |
| return; |
| } |
| |
| entry->offset = offset; |
| resource_list_add_tail(entry, resources); |
| } |
| EXPORT_SYMBOL(pci_add_resource_offset); |
| |
| void pci_add_resource(struct list_head *resources, struct resource *res) |
| { |
| pci_add_resource_offset(resources, res, 0); |
| } |
| EXPORT_SYMBOL(pci_add_resource); |
| |
| void pci_free_resource_list(struct list_head *resources) |
| { |
| resource_list_free(resources); |
| } |
| EXPORT_SYMBOL(pci_free_resource_list); |
| |
| void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, |
| unsigned int flags) |
| { |
| struct pci_bus_resource *bus_res; |
| |
| bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL); |
| if (!bus_res) { |
| dev_err(&bus->dev, "can't add %pR resource\n", res); |
| return; |
| } |
| |
| bus_res->res = res; |
| bus_res->flags = flags; |
| list_add_tail(&bus_res->list, &bus->resources); |
| } |
| |
| struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n) |
| { |
| struct pci_bus_resource *bus_res; |
| |
| if (n < PCI_BRIDGE_RESOURCE_NUM) |
| return bus->resource[n]; |
| |
| n -= PCI_BRIDGE_RESOURCE_NUM; |
| list_for_each_entry(bus_res, &bus->resources, list) { |
| if (n-- == 0) |
| return bus_res->res; |
| } |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(pci_bus_resource_n); |
| |
| void pci_bus_remove_resources(struct pci_bus *bus) |
| { |
| int i; |
| struct pci_bus_resource *bus_res, *tmp; |
| |
| for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) |
| bus->resource[i] = NULL; |
| |
| list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) { |
| list_del(&bus_res->list); |
| kfree(bus_res); |
| } |
| } |
| |
| int devm_request_pci_bus_resources(struct device *dev, |
| struct list_head *resources) |
| { |
| struct resource_entry *win; |
| struct resource *parent, *res; |
| int err; |
| |
| resource_list_for_each_entry(win, resources) { |
| res = win->res; |
| switch (resource_type(res)) { |
| case IORESOURCE_IO: |
| parent = &ioport_resource; |
| break; |
| case IORESOURCE_MEM: |
| parent = &iomem_resource; |
| break; |
| default: |
| continue; |
| } |
| |
| err = devm_request_resource(dev, parent, res); |
| if (err) |
| return err; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources); |
| |
| static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL}; |
| #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT |
| static struct pci_bus_region pci_64_bit = {0, |
| (pci_bus_addr_t) 0xffffffffffffffffULL}; |
| static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL, |
| (pci_bus_addr_t) 0xffffffffffffffffULL}; |
| #endif |
| |
| /* |
| * @res contains CPU addresses. Clip it so the corresponding bus addresses |
| * on @bus are entirely within @region. This is used to control the bus |
| * addresses of resources we allocate, e.g., we may need a resource that |
| * can be mapped by a 32-bit BAR. |
| */ |
| static void pci_clip_resource_to_region(struct pci_bus *bus, |
| struct resource *res, |
| struct pci_bus_region *region) |
| { |
| struct pci_bus_region r; |
| |
| pcibios_resource_to_bus(bus, &r, res); |
| if (r.start < region->start) |
| r.start = region->start; |
| if (r.end > region->end) |
| r.end = region->end; |
| |
| if (r.end < r.start) |
| res->end = res->start - 1; |
| else |
| pcibios_bus_to_resource(bus, res, &r); |
| } |
| |
| static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res, |
| resource_size_t size, resource_size_t align, |
| resource_size_t min, unsigned long type_mask, |
| resource_size_t (*alignf)(void *, |
| const struct resource *, |
| resource_size_t, |
| resource_size_t), |
| void *alignf_data, |
| struct pci_bus_region *region) |
| { |
| int i, ret; |
| struct resource *r, avail; |
| resource_size_t max; |
| |
| type_mask |= IORESOURCE_TYPE_BITS; |
| |
| pci_bus_for_each_resource(bus, r, i) { |
| resource_size_t min_used = min; |
| |
| if (!r) |
| continue; |
| |
| /* type_mask must match */ |
| if ((res->flags ^ r->flags) & type_mask) |
| continue; |
| |
| /* We cannot allocate a non-prefetching resource |
| from a pre-fetching area */ |
| if ((r->flags & IORESOURCE_PREFETCH) && |
| !(res->flags & IORESOURCE_PREFETCH)) |
| continue; |
| |
| avail = *r; |
| pci_clip_resource_to_region(bus, &avail, region); |
| |
| /* |
| * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to |
| * protect badly documented motherboard resources, but if |
| * this is an already-configured bridge window, its start |
| * overrides "min". |
| */ |
| if (avail.start) |
| min_used = avail.start; |
| |
| max = avail.end; |
| |
| /* Ok, try it out.. */ |
| ret = allocate_resource(r, res, size, min_used, max, |
| align, alignf, alignf_data); |
| if (ret == 0) |
| return 0; |
| } |
| return -ENOMEM; |
| } |
| |
| /** |
| * pci_bus_alloc_resource - allocate a resource from a parent bus |
| * @bus: PCI bus |
| * @res: resource to allocate |
| * @size: size of resource to allocate |
| * @align: alignment of resource to allocate |
| * @min: minimum /proc/iomem address to allocate |
| * @type_mask: IORESOURCE_* type flags |
| * @alignf: resource alignment function |
| * @alignf_data: data argument for resource alignment function |
| * |
| * Given the PCI bus a device resides on, the size, minimum address, |
| * alignment and type, try to find an acceptable resource allocation |
| * for a specific device resource. |
| */ |
| int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, |
| resource_size_t size, resource_size_t align, |
| resource_size_t min, unsigned long type_mask, |
| resource_size_t (*alignf)(void *, |
| const struct resource *, |
| resource_size_t, |
| resource_size_t), |
| void *alignf_data) |
| { |
| #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT |
| int rc; |
| |
| if (res->flags & IORESOURCE_MEM_64) { |
| rc = pci_bus_alloc_from_region(bus, res, size, align, min, |
| type_mask, alignf, alignf_data, |
| &pci_high); |
| if (rc == 0) |
| return 0; |
| |
| return pci_bus_alloc_from_region(bus, res, size, align, min, |
| type_mask, alignf, alignf_data, |
| &pci_64_bit); |
| } |
| #endif |
| |
| return pci_bus_alloc_from_region(bus, res, size, align, min, |
| type_mask, alignf, alignf_data, |
| &pci_32_bit); |
| } |
| EXPORT_SYMBOL(pci_bus_alloc_resource); |
| |
| /* |
| * The @idx resource of @dev should be a PCI-PCI bridge window. If this |
| * resource fits inside a window of an upstream bridge, do nothing. If it |
| * overlaps an upstream window but extends outside it, clip the resource so |
| * it fits completely inside. |
| */ |
| bool pci_bus_clip_resource(struct pci_dev *dev, int idx) |
| { |
| struct pci_bus *bus = dev->bus; |
| struct resource *res = &dev->resource[idx]; |
| struct resource orig_res = *res; |
| struct resource *r; |
| int i; |
| |
| pci_bus_for_each_resource(bus, r, i) { |
| resource_size_t start, end; |
| |
| if (!r) |
| continue; |
| |
| if (resource_type(res) != resource_type(r)) |
| continue; |
| |
| start = max(r->start, res->start); |
| end = min(r->end, res->end); |
| |
| if (start > end) |
| continue; /* no overlap */ |
| |
| if (res->start == start && res->end == end) |
| return false; /* no change */ |
| |
| res->start = start; |
| res->end = end; |
| res->flags &= ~IORESOURCE_UNSET; |
| orig_res.flags &= ~IORESOURCE_UNSET; |
| dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n", |
| &orig_res, res); |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { } |
| |
| void __weak pcibios_bus_add_device(struct pci_dev *pdev) { } |
| |
| /** |
| * pci_bus_add_device - start driver for a single device |
| * @dev: device to add |
| * |
| * This adds add sysfs entries and start device drivers |
| */ |
| void pci_bus_add_device(struct pci_dev *dev) |
| { |
| int retval; |
| |
| /* |
| * Can not put in pci_device_add yet because resources |
| * are not assigned yet for some devices. |
| */ |
| pcibios_bus_add_device(dev); |
| pci_fixup_device(pci_fixup_final, dev); |
| pci_create_sysfs_dev_files(dev); |
| pci_proc_attach_device(dev); |
| |
| dev->match_driver = true; |
| retval = device_attach(&dev->dev); |
| if (retval < 0 && retval != -EPROBE_DEFER) { |
| dev_warn(&dev->dev, "device attach failed (%d)\n", retval); |
| pci_proc_detach_device(dev); |
| pci_remove_sysfs_dev_files(dev); |
| return; |
| } |
| |
| dev->is_added = 1; |
| } |
| EXPORT_SYMBOL_GPL(pci_bus_add_device); |
| |
| /** |
| * pci_bus_add_devices - start driver for PCI devices |
| * @bus: bus to check for new devices |
| * |
| * Start driver for PCI devices and add some sysfs entries. |
| */ |
| void pci_bus_add_devices(const struct pci_bus *bus) |
| { |
| struct pci_dev *dev; |
| struct pci_bus *child; |
| |
| list_for_each_entry(dev, &bus->devices, bus_list) { |
| /* Skip already-added devices */ |
| if (dev->is_added) |
| continue; |
| pci_bus_add_device(dev); |
| } |
| |
| list_for_each_entry(dev, &bus->devices, bus_list) { |
| /* Skip if device attach failed */ |
| if (!dev->is_added) |
| continue; |
| child = dev->subordinate; |
| if (child) |
| pci_bus_add_devices(child); |
| } |
| } |
| EXPORT_SYMBOL(pci_bus_add_devices); |
| |
| /** pci_walk_bus - walk devices on/under bus, calling callback. |
| * @top bus whose devices should be walked |
| * @cb callback to be called for each device found |
| * @userdata arbitrary pointer to be passed to callback. |
| * |
| * Walk the given bus, including any bridged devices |
| * on buses under this bus. Call the provided callback |
| * on each device found. |
| * |
| * We check the return of @cb each time. If it returns anything |
| * other than 0, we break out. |
| * |
| */ |
| void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), |
| void *userdata) |
| { |
| struct pci_dev *dev; |
| struct pci_bus *bus; |
| struct list_head *next; |
| int retval; |
| |
| bus = top; |
| down_read(&pci_bus_sem); |
| next = top->devices.next; |
| for (;;) { |
| if (next == &bus->devices) { |
| /* end of this bus, go up or finish */ |
| if (bus == top) |
| break; |
| next = bus->self->bus_list.next; |
| bus = bus->self->bus; |
| continue; |
| } |
| dev = list_entry(next, struct pci_dev, bus_list); |
| if (dev->subordinate) { |
| /* this is a pci-pci bridge, do its devices next */ |
| next = dev->subordinate->devices.next; |
| bus = dev->subordinate; |
| } else |
| next = dev->bus_list.next; |
| |
| retval = cb(dev, userdata); |
| if (retval) |
| break; |
| } |
| up_read(&pci_bus_sem); |
| } |
| EXPORT_SYMBOL_GPL(pci_walk_bus); |
| |
| struct pci_bus *pci_bus_get(struct pci_bus *bus) |
| { |
| if (bus) |
| get_device(&bus->dev); |
| return bus; |
| } |
| EXPORT_SYMBOL(pci_bus_get); |
| |
| void pci_bus_put(struct pci_bus *bus) |
| { |
| if (bus) |
| put_device(&bus->dev); |
| } |
| EXPORT_SYMBOL(pci_bus_put); |