![Bjorn Helgaas](/assets/img/avatar_default.png)
If we fail to assign resources to a PCI BAR, this patch makes us try the original address from BIOS rather than leaving it disabled. Linux tries to make sure all PCI device BARs are inside the upstream PCI host bridge or P2P bridge apertures, reassigning BARs if necessary. Windows does similar reassignment. Before this patch, if we could not move a BAR into an aperture, we left the resource unassigned, i.e., at address zero. Windows leaves such BARs at the original BIOS addresses, and this patch makes Linux do the same. This is a bit ugly because we disable the resource long before we try to reassign it, so we have to keep track of the BIOS BAR address somewhere. For lack of a better place, I put it in the struct pci_dev. I think it would be cleaner to attempt the assignment immediately when the claim fails, so we could easily remember the original address. But we currently claim motherboard resources in the middle, after attempting to claim PCI resources and before assigning new PCI resources, and changing that is a fairly big job. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=16263 Reported-by: Andrew <nitr0@seti.kr.ua> Tested-by: Andrew <nitr0@seti.kr.ua> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
331 lines
7.8 KiB
C
331 lines
7.8 KiB
C
/*
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* drivers/pci/setup-res.c
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*
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* Extruded from code written by
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* Dave Rusling (david.rusling@reo.mts.dec.com)
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* David Mosberger (davidm@cs.arizona.edu)
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* David Miller (davem@redhat.com)
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*
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* Support routines for initializing a PCI subsystem.
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*/
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/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
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/*
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* Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
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* Resource sorting
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/cache.h>
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#include <linux/slab.h>
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#include "pci.h"
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void pci_update_resource(struct pci_dev *dev, int resno)
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{
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struct pci_bus_region region;
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u32 new, check, mask;
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int reg;
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enum pci_bar_type type;
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struct resource *res = dev->resource + resno;
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/*
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* Ignore resources for unimplemented BARs and unused resource slots
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* for 64 bit BARs.
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*/
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if (!res->flags)
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return;
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/*
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* Ignore non-moveable resources. This might be legacy resources for
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* which no functional BAR register exists or another important
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* system resource we shouldn't move around.
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*/
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if (res->flags & IORESOURCE_PCI_FIXED)
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return;
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pcibios_resource_to_bus(dev, ®ion, res);
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new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
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if (res->flags & IORESOURCE_IO)
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mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
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else
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mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
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reg = pci_resource_bar(dev, resno, &type);
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if (!reg)
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return;
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if (type != pci_bar_unknown) {
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if (!(res->flags & IORESOURCE_ROM_ENABLE))
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return;
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new |= PCI_ROM_ADDRESS_ENABLE;
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}
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pci_write_config_dword(dev, reg, new);
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pci_read_config_dword(dev, reg, &check);
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if ((new ^ check) & mask) {
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dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
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resno, new, check);
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}
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if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
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(PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
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new = region.start >> 16 >> 16;
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pci_write_config_dword(dev, reg + 4, new);
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pci_read_config_dword(dev, reg + 4, &check);
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if (check != new) {
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dev_err(&dev->dev, "BAR %d: error updating "
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"(high %#08x != %#08x)\n", resno, new, check);
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}
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}
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res->flags &= ~IORESOURCE_UNSET;
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dev_info(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx]\n",
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resno, res, (unsigned long long)region.start,
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(unsigned long long)region.end);
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}
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int pci_claim_resource(struct pci_dev *dev, int resource)
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{
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struct resource *res = &dev->resource[resource];
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struct resource *root, *conflict;
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root = pci_find_parent_resource(dev, res);
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if (!root) {
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dev_info(&dev->dev, "no compatible bridge window for %pR\n",
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res);
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return -EINVAL;
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}
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conflict = request_resource_conflict(root, res);
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if (conflict) {
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dev_info(&dev->dev,
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"address space collision: %pR conflicts with %s %pR\n",
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res, conflict->name, conflict);
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return -EBUSY;
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}
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return 0;
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}
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EXPORT_SYMBOL(pci_claim_resource);
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#ifdef CONFIG_PCI_QUIRKS
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void pci_disable_bridge_window(struct pci_dev *dev)
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{
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dev_info(&dev->dev, "disabling bridge mem windows\n");
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/* MMIO Base/Limit */
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pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
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/* Prefetchable MMIO Base/Limit */
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pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
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pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
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pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
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}
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#endif /* CONFIG_PCI_QUIRKS */
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static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
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int resno)
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{
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struct resource *res = dev->resource + resno;
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resource_size_t size, min, align;
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int ret;
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size = resource_size(res);
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min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
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align = pci_resource_alignment(dev, res);
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/* First, try exact prefetching match.. */
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ret = pci_bus_alloc_resource(bus, res, size, align, min,
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IORESOURCE_PREFETCH,
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pcibios_align_resource, dev);
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if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
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/*
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* That failed.
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*
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* But a prefetching area can handle a non-prefetching
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* window (it will just not perform as well).
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*/
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ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
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pcibios_align_resource, dev);
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}
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if (ret < 0 && dev->fw_addr[resno]) {
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struct resource *root, *conflict;
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resource_size_t start, end;
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/*
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* If we failed to assign anything, let's try the address
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* where firmware left it. That at least has a chance of
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* working, which is better than just leaving it disabled.
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*/
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if (res->flags & IORESOURCE_IO)
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root = &ioport_resource;
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else
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root = &iomem_resource;
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start = res->start;
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end = res->end;
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res->start = dev->fw_addr[resno];
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res->end = res->start + size - 1;
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dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
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resno, res);
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conflict = request_resource_conflict(root, res);
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if (conflict) {
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dev_info(&dev->dev,
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"BAR %d: %pR conflicts with %s %pR\n", resno,
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res, conflict->name, conflict);
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res->start = start;
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res->end = end;
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} else
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ret = 0;
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}
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if (!ret) {
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res->flags &= ~IORESOURCE_STARTALIGN;
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dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
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if (resno < PCI_BRIDGE_RESOURCES)
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pci_update_resource(dev, resno);
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}
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return ret;
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}
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int pci_assign_resource(struct pci_dev *dev, int resno)
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{
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struct resource *res = dev->resource + resno;
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resource_size_t align;
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struct pci_bus *bus;
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int ret;
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char *type;
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align = pci_resource_alignment(dev, res);
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if (!align) {
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dev_info(&dev->dev, "BAR %d: can't assign %pR "
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"(bogus alignment)\n", resno, res);
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return -EINVAL;
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}
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bus = dev->bus;
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while ((ret = __pci_assign_resource(bus, dev, resno))) {
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if (bus->parent && bus->self->transparent)
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bus = bus->parent;
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else
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bus = NULL;
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if (bus)
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continue;
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break;
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}
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if (ret) {
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if (res->flags & IORESOURCE_MEM)
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if (res->flags & IORESOURCE_PREFETCH)
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type = "mem pref";
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else
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type = "mem";
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else if (res->flags & IORESOURCE_IO)
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type = "io";
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else
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type = "unknown";
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dev_info(&dev->dev,
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"BAR %d: can't assign %s (size %#llx)\n",
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resno, type, (unsigned long long) resource_size(res));
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}
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return ret;
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}
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/* Sort resources by alignment */
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void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
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{
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int i;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *r;
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struct resource_list *list, *tmp;
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resource_size_t r_align;
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r = &dev->resource[i];
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if (r->flags & IORESOURCE_PCI_FIXED)
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continue;
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if (!(r->flags) || r->parent)
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continue;
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r_align = pci_resource_alignment(dev, r);
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if (!r_align) {
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dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
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i, r);
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continue;
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}
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for (list = head; ; list = list->next) {
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resource_size_t align = 0;
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struct resource_list *ln = list->next;
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if (ln)
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align = pci_resource_alignment(ln->dev, ln->res);
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if (r_align > align) {
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tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
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if (!tmp)
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panic("pdev_sort_resources(): "
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"kmalloc() failed!\n");
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tmp->next = ln;
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tmp->res = r;
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tmp->dev = dev;
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list->next = tmp;
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break;
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}
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}
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}
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}
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int pci_enable_resources(struct pci_dev *dev, int mask)
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{
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u16 cmd, old_cmd;
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int i;
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struct resource *r;
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pci_read_config_word(dev, PCI_COMMAND, &cmd);
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old_cmd = cmd;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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if (!(mask & (1 << i)))
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continue;
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r = &dev->resource[i];
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if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
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continue;
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if ((i == PCI_ROM_RESOURCE) &&
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(!(r->flags & IORESOURCE_ROM_ENABLE)))
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continue;
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if (!r->parent) {
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dev_err(&dev->dev, "device not available "
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"(can't reserve %pR)\n", r);
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return -EINVAL;
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}
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if (r->flags & IORESOURCE_IO)
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cmd |= PCI_COMMAND_IO;
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if (r->flags & IORESOURCE_MEM)
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cmd |= PCI_COMMAND_MEMORY;
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}
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if (cmd != old_cmd) {
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dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
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old_cmd, cmd);
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pci_write_config_word(dev, PCI_COMMAND, cmd);
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}
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return 0;
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}
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