/* * drivers/pci/setup-res.c * * Extruded from code written by * Dave Rusling (david.rusling@reo.mts.dec.com) * David Mosberger (davidm@cs.arizona.edu) * David Miller (davem@redhat.com) * * Support routines for initializing a PCI subsystem. */ /* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */ /* * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru> * Resource sorting */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/errno.h> #include <linux/ioport.h> #include <linux/cache.h> #include <linux/slab.h> #include "pci.h" void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno) { struct pci_bus_region region; u32 new, check, mask; int reg; /* * Ignore resources for unimplemented BARs and unused resource slots * for 64 bit BARs. */ if (!res->flags) return; /* * Ignore non-moveable resources. This might be legacy resources for * which no functional BAR register exists or another important * system resource we should better not move around in system address * space. */ if (res->flags & IORESOURCE_PCI_FIXED) return; pcibios_resource_to_bus(dev, ®ion, res); pr_debug(" got res [%llx:%llx] bus [%lx:%lx] flags %lx for " "BAR %d of %s\n", (unsigned long long)res->start, (unsigned long long)res->end, region.start, region.end, res->flags, resno, pci_name(dev)); new = region.start | (res->flags & PCI_REGION_FLAG_MASK); if (res->flags & IORESOURCE_IO) mask = (u32)PCI_BASE_ADDRESS_IO_MASK; else mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; if (resno < 6) { reg = PCI_BASE_ADDRESS_0 + 4 * resno; } else if (resno == PCI_ROM_RESOURCE) { if (!(res->flags & IORESOURCE_ROM_ENABLE)) return; new |= PCI_ROM_ADDRESS_ENABLE; reg = dev->rom_base_reg; } else { /* Hmm, non-standard resource. */ return; /* kill uninitialised var warning */ } pci_write_config_dword(dev, reg, new); pci_read_config_dword(dev, reg, &check); if ((new ^ check) & mask) { printk(KERN_ERR "PCI: Error while updating region " "%s/%d (%08x != %08x)\n", pci_name(dev), resno, new, check); } if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) { new = region.start >> 16 >> 16; pci_write_config_dword(dev, reg + 4, new); pci_read_config_dword(dev, reg + 4, &check); if (check != new) { printk(KERN_ERR "PCI: Error updating region " "%s/%d (high %08x != %08x)\n", pci_name(dev), resno, new, check); } } res->flags &= ~IORESOURCE_UNSET; pr_debug("PCI: moved device %s resource %d (%lx) to %x\n", pci_name(dev), resno, res->flags, new & ~PCI_REGION_FLAG_MASK); } int pci_claim_resource(struct pci_dev *dev, int resource) { struct resource *res = &dev->resource[resource]; struct resource *root = NULL; char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; int err; root = pcibios_select_root(dev, res); err = -EINVAL; if (root != NULL) err = insert_resource(root, res); if (err) { printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n", root ? "Address space collision on" : "No parent found for", resource, dtype, pci_name(dev), (unsigned long long)res->start, (unsigned long long)res->end); } return err; } EXPORT_SYMBOL_GPL(pci_claim_resource); int pci_assign_resource(struct pci_dev *dev, int resno) { struct pci_bus *bus = dev->bus; struct resource *res = dev->resource + resno; resource_size_t size, min, align; int ret; size = res->end - res->start + 1; min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; /* The bridge resources are special, as their size != alignment. Sizing routines return required alignment in the "start" field. */ align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start; /* First, try exact prefetching match.. */ ret = pci_bus_alloc_resource(bus, res, size, align, min, IORESOURCE_PREFETCH, pcibios_align_resource, dev); if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { /* * That failed. * * But a prefetching area can handle a non-prefetching * window (it will just not perform as well). */ ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, pcibios_align_resource, dev); } if (ret) { printk(KERN_ERR "PCI: Failed to allocate %s resource " "#%d:%llx@%llx for %s\n", res->flags & IORESOURCE_IO ? "I/O" : "mem", resno, (unsigned long long)size, (unsigned long long)res->start, pci_name(dev)); } else if (resno < PCI_BRIDGE_RESOURCES) { pci_update_resource(dev, res, resno); } return ret; } #ifdef CONFIG_EMBEDDED int pci_assign_resource_fixed(struct pci_dev *dev, int resno) { struct pci_bus *bus = dev->bus; struct resource *res = dev->resource + resno; unsigned int type_mask; int i, ret = -EBUSY; type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH; for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { struct resource *r = bus->resource[i]; if (!r) continue; /* type_mask must match */ if ((res->flags ^ r->flags) & type_mask) continue; ret = request_resource(r, res); if (ret == 0) break; } if (ret) { printk(KERN_ERR "PCI: Failed to allocate %s resource " "#%d:%llx@%llx for %s\n", res->flags & IORESOURCE_IO ? "I/O" : "mem", resno, (unsigned long long)(res->end - res->start + 1), (unsigned long long)res->start, pci_name(dev)); } else if (resno < PCI_BRIDGE_RESOURCES) { pci_update_resource(dev, res, resno); } return ret; } EXPORT_SYMBOL_GPL(pci_assign_resource_fixed); #endif /* Sort resources by alignment */ void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) { int i; for (i = 0; i < PCI_NUM_RESOURCES; i++) { struct resource *r; struct resource_list *list, *tmp; resource_size_t r_align; r = &dev->resource[i]; if (r->flags & IORESOURCE_PCI_FIXED) continue; r_align = r->end - r->start; if (!(r->flags) || r->parent) continue; if (!r_align) { printk(KERN_WARNING "PCI: Ignore bogus resource %d " "[%llx:%llx] of %s\n", i, (unsigned long long)r->start, (unsigned long long)r->end, pci_name(dev)); continue; } r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start; for (list = head; ; list = list->next) { resource_size_t align = 0; struct resource_list *ln = list->next; int idx; if (ln) { idx = ln->res - &ln->dev->resource[0]; align = (idx < PCI_BRIDGE_RESOURCES) ? ln->res->end - ln->res->start + 1 : ln->res->start; } if (r_align > align) { tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); if (!tmp) panic("pdev_sort_resources(): " "kmalloc() failed!\n"); tmp->next = ln; tmp->res = r; tmp->dev = dev; list->next = tmp; break; } } } }