powerpc/pci: Improve detection of unassigned bridge resources
When the powerpc PCI layer is not configured to re-assign everything, it currently fails to detect that a PCI to PCI bridge has been left unassigned by the firmware and tries to allocate resource for the default window values in the bridge (0...X) (with the notable exception of a hack we have in there that detects some Apple firmware unassigned bridge resources). This results in resource allocation failures, which are generally fixed up later on but it causes scary warnings in the logs and we have seen the fixup code fall over in some circumstances (a different issue to fix as well). This code improves that by providing a more complete & useful function to intuit that a bridge was left unassigned by the firmware, and thus force a full re-allocation by the PCI code without trying to allocate the existing useless resources first. The algorithm we use basically considers unassigned a window that starts at 0 (PCI address) if the corresponding address space enable bit is not set. In addition, for memory space, it considers such a resource unassigned also if the host bridge isn't configured to forward cycles to address 0 (ie, the resource basically overlaps main memory). This fixes a range of problems with things like Bare-Metal support on pSeries machines, or attempt to use partial firmware PCI setup. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt
parent
eef2622a9f
commit
b556151110
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@ -780,11 +780,6 @@ static void __devinit fixup_resource(struct resource *res, struct pci_dev *dev)
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res->start = (res->start + offset) & mask;
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res->end = (res->end + offset) & mask;
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pr_debug("PCI:%s %016llx-%016llx\n",
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pci_name(dev),
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(unsigned long long)res->start,
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(unsigned long long)res->end);
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}
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@ -830,6 +825,11 @@ static void __devinit pcibios_fixup_resources(struct pci_dev *dev)
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(unsigned int)res->flags);
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fixup_resource(res, dev);
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pr_debug("PCI:%s %016llx-%016llx\n",
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pci_name(dev),
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(unsigned long long)res->start,
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(unsigned long long)res->end);
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}
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/* Call machine specific resource fixup */
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@ -838,58 +838,127 @@ static void __devinit pcibios_fixup_resources(struct pci_dev *dev)
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}
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DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
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static void __devinit __pcibios_fixup_bus(struct pci_bus *bus)
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/* This function tries to figure out if a bridge resource has been initialized
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* by the firmware or not. It doesn't have to be absolutely bullet proof, but
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* things go more smoothly when it gets it right. It should covers cases such
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* as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges
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*/
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static int __devinit pcibios_uninitialized_bridge_resource(struct pci_bus *bus,
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struct resource *res)
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{
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struct pci_controller *hose = pci_bus_to_host(bus);
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struct pci_dev *dev = bus->self;
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resource_size_t offset;
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u16 command;
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int i;
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/* We don't do anything if PCI_PROBE_ONLY is set */
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if (ppc_pci_flags & PPC_PCI_PROBE_ONLY)
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return 0;
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/* Job is a bit different between memory and IO */
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if (res->flags & IORESOURCE_MEM) {
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/* If the BAR is non-0 (res != pci_mem_offset) then it's probably been
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* initialized by somebody
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*/
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if (res->start != hose->pci_mem_offset)
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return 0;
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/* The BAR is 0, let's check if memory decoding is enabled on
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* the bridge. If not, we consider it unassigned
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*/
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pci_read_config_word(dev, PCI_COMMAND, &command);
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if ((command & PCI_COMMAND_MEMORY) == 0)
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return 1;
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/* Memory decoding is enabled and the BAR is 0. If any of the bridge
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* resources covers that starting address (0 then it's good enough for
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* us for memory
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*/
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for (i = 0; i < 3; i++) {
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if ((hose->mem_resources[i].flags & IORESOURCE_MEM) &&
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hose->mem_resources[i].start == hose->pci_mem_offset)
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return 0;
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}
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/* Well, it starts at 0 and we know it will collide so we may as
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* well consider it as unassigned. That covers the Apple case.
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*/
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return 1;
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} else {
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/* If the BAR is non-0, then we consider it assigned */
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offset = (unsigned long)hose->io_base_virt - _IO_BASE;
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if (((res->start - offset) & 0xfffffffful) != 0)
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return 0;
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/* Here, we are a bit different than memory as typically IO space
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* starting at low addresses -is- valid. What we do instead if that
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* we consider as unassigned anything that doesn't have IO enabled
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* in the PCI command register, and that's it.
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*/
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pci_read_config_word(dev, PCI_COMMAND, &command);
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if (command & PCI_COMMAND_IO)
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return 0;
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/* It's starting at 0 and IO is disabled in the bridge, consider
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* it unassigned
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*/
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return 1;
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}
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}
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/* Fixup resources of a PCI<->PCI bridge */
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static void __devinit pcibios_fixup_bridge(struct pci_bus *bus)
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{
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struct resource *res;
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int i;
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struct pci_dev *dev = bus->self;
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for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
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if ((res = bus->resource[i]) == NULL)
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continue;
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if (!res->flags)
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continue;
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if (i >= 3 && bus->self->transparent)
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continue;
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pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n",
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pci_name(dev), i,
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(unsigned long long)res->start,\
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(unsigned long long)res->end,
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(unsigned int)res->flags);
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/* Perform fixup */
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fixup_resource(res, dev);
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/* Try to detect uninitialized P2P bridge resources,
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* and clear them out so they get re-assigned later
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*/
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if (pcibios_uninitialized_bridge_resource(bus, res)) {
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res->flags = 0;
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pr_debug("PCI:%s (unassigned)\n", pci_name(dev));
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} else {
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pr_debug("PCI:%s %016llx-%016llx\n",
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pci_name(dev),
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(unsigned long long)res->start,
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(unsigned long long)res->end);
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}
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}
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}
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static void __devinit __pcibios_fixup_bus(struct pci_bus *bus)
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{
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struct pci_dev *dev = bus->self;
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pr_debug("PCI: Fixup bus %d (%s)\n", bus->number, dev ? pci_name(dev) : "PHB");
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/* Fixup PCI<->PCI bridges. Host bridges are handled separately, for
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* now differently between 32 and 64 bits.
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*/
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if (dev != NULL) {
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struct resource *res;
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int i;
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for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
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if ((res = bus->resource[i]) == NULL)
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continue;
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if (!res->flags)
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continue;
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if (i >= 3 && bus->self->transparent)
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continue;
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/* On PowerMac, Apple leaves bridge windows open over
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* an inaccessible region of memory space (0...fffff)
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* which is somewhat bogus, but that's what they think
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* means disabled...
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*
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* We clear those to force them to be reallocated later
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*
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* We detect such regions by the fact that the base is
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* equal to the pci_mem_offset of the host bridge and
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* their size is smaller than 1M.
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*/
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if (res->flags & IORESOURCE_MEM &&
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res->start == hose->pci_mem_offset &&
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res->end < 0x100000) {
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printk(KERN_INFO
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"PCI: Closing bogus Apple Firmware"
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" region %d on bus 0x%02x\n",
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i, bus->number);
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res->flags = 0;
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continue;
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}
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pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n",
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pci_name(dev), i,
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(unsigned long long)res->start,\
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(unsigned long long)res->end,
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(unsigned int)res->flags);
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fixup_resource(res, dev);
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}
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}
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if (dev != NULL)
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pcibios_fixup_bridge(bus);
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/* Additional setup that is different between 32 and 64 bits for now */
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pcibios_do_bus_setup(bus);
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