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PCI/ACPI: Don't cache _PRT, and don't associate them with bus numbers
Previously, we cached _PRT (PCI routing table, ACPI 5.0 sec 6.2.12)
contents and associated each _PRT entry with a PCI bus number. The bus
number association means dependencies on PCI device enumeration and bus
number assignment, as well as on the PCI/ACPI binding process.
After 4f535093cf ("PCI: Put pci_dev in device tree as early as possible"),
these dependencies caused the IRQ issues reported by Peter:
pci 0000:00:1e.0: PCI bridge to [bus 09] (subtractive decode)
pci 0000:00:1e.0: can't derive routing for PCI INT A
snd_ctxfi 0000:09:02.0: PCI INT A: no GSI - using ISA IRQ 5
irq 18: nobody cared (try booting with the "irqpoll" option)
This patch removes _PRT caching. Instead, we evaluate _PRT as needed
in the pci_enable_device() path. This also removes the dependency on
PCI bus numbers: we can simply look at the _PRT associated with each
bridge as we walk upstream toward the root.
[bhelgaas: changelog]
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=53561
Reported-and-tested-by: Peter Hurley <peter@hurleysoftware.com>
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yinghai Lu
Bjorn Helgaas
parent
be6d2867b4
commit
181380b702
@ -53,9 +53,6 @@ struct acpi_prt_entry {
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u32 index; /* GSI, or link _CRS index */
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};
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static LIST_HEAD(acpi_prt_list);
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static DEFINE_SPINLOCK(acpi_prt_lock);
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static inline char pin_name(int pin)
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{
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return 'A' + pin - 1;
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@ -65,28 +62,6 @@ static inline char pin_name(int pin)
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PCI IRQ Routing Table (PRT) Support
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-------------------------------------------------------------------------- */
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static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
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int pin)
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{
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struct acpi_prt_entry *entry;
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int segment = pci_domain_nr(dev->bus);
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int bus = dev->bus->number;
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int device = PCI_SLOT(dev->devfn);
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spin_lock(&acpi_prt_lock);
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list_for_each_entry(entry, &acpi_prt_list, list) {
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if ((segment == entry->id.segment)
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&& (bus == entry->id.bus)
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&& (device == entry->id.device)
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&& (pin == entry->pin)) {
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spin_unlock(&acpi_prt_lock);
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return entry;
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}
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}
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spin_unlock(&acpi_prt_lock);
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return NULL;
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}
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/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
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static const struct dmi_system_id medion_md9580[] = {
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{
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@ -184,11 +159,19 @@ static void do_prt_fixups(struct acpi_prt_entry *entry,
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}
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}
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static int acpi_pci_irq_add_entry(acpi_handle handle, int segment, int bus,
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struct acpi_pci_routing_table *prt)
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static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev,
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int pin, struct acpi_pci_routing_table *prt,
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struct acpi_prt_entry **entry_ptr)
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{
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int segment = pci_domain_nr(dev->bus);
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int bus = dev->bus->number;
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int device = PCI_SLOT(dev->devfn);
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struct acpi_prt_entry *entry;
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if (((prt->address >> 16) & 0xffff) != device ||
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prt->pin + 1 != pin)
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return -ENODEV;
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entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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@ -237,43 +220,37 @@ static int acpi_pci_irq_add_entry(acpi_handle handle, int segment, int bus,
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entry->id.device, pin_name(entry->pin),
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prt->source, entry->index));
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spin_lock(&acpi_prt_lock);
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list_add_tail(&entry->list, &acpi_prt_list);
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spin_unlock(&acpi_prt_lock);
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*entry_ptr = entry;
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return 0;
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}
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int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
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static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
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int pin, struct acpi_prt_entry **entry_ptr)
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{
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acpi_status status;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_pci_routing_table *entry;
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acpi_handle handle = NULL;
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/* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
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status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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if (ACPI_FAILURE(status))
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if (dev->bus->bridge)
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handle = ACPI_HANDLE(dev->bus->bridge);
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if (!handle)
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return -ENODEV;
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printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
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(char *) buffer.pointer);
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kfree(buffer.pointer);
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buffer.length = ACPI_ALLOCATE_BUFFER;
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buffer.pointer = NULL;
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/* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
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status = acpi_get_irq_routing_table(handle, &buffer);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
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acpi_format_exception(status)));
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kfree(buffer.pointer);
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return -ENODEV;
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}
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entry = buffer.pointer;
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while (entry && (entry->length > 0)) {
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acpi_pci_irq_add_entry(handle, segment, bus, entry);
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if (!acpi_pci_irq_check_entry(handle, dev, pin,
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entry, entry_ptr))
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break;
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entry = (struct acpi_pci_routing_table *)
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((unsigned long)entry + entry->length);
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}
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@ -282,23 +259,6 @@ int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
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return 0;
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}
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void acpi_pci_irq_del_prt(int segment, int bus)
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{
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struct acpi_prt_entry *entry, *tmp;
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printk(KERN_DEBUG
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"ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
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segment, bus);
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spin_lock(&acpi_prt_lock);
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list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
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if (segment == entry->id.segment && bus == entry->id.bus) {
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list_del(&entry->list);
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kfree(entry);
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}
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}
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spin_unlock(&acpi_prt_lock);
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}
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/* --------------------------------------------------------------------------
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PCI Interrupt Routing Support
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-------------------------------------------------------------------------- */
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@ -359,12 +319,13 @@ static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
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static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
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{
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struct acpi_prt_entry *entry;
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struct acpi_prt_entry *entry = NULL;
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struct pci_dev *bridge;
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u8 bridge_pin, orig_pin = pin;
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int ret;
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entry = acpi_pci_irq_find_prt_entry(dev, pin);
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if (entry) {
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ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry);
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if (!ret && entry) {
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#ifdef CONFIG_X86_IO_APIC
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acpi_reroute_boot_interrupt(dev, entry);
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#endif /* CONFIG_X86_IO_APIC */
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@ -373,7 +334,7 @@ static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
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return entry;
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}
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/*
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/*
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* Attempt to derive an IRQ for this device from a parent bridge's
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* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
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*/
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@ -393,8 +354,8 @@ static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
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pin = bridge_pin;
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}
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entry = acpi_pci_irq_find_prt_entry(bridge, pin);
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if (entry) {
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ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry);
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if (!ret && entry) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Derived GSI for %s INT %c from %s\n",
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pci_name(dev), pin_name(orig_pin),
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@ -470,6 +431,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
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dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
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pin_name(pin));
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}
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return 0;
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}
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@ -477,6 +439,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
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if (rc < 0) {
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dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
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pin_name(pin));
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kfree(entry);
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return rc;
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}
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dev->irq = rc;
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@ -491,6 +454,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
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(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
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(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
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kfree(entry);
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return 0;
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}
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@ -513,6 +477,8 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
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else
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gsi = entry->index;
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kfree(entry);
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/*
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* TBD: It might be worth clearing dev->irq by magic constant
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* (e.g. PCI_UNDEFINED_IRQ).
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@ -434,7 +434,6 @@ static int acpi_pci_root_add(struct acpi_device *device)
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acpi_status status;
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int result;
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struct acpi_pci_root *root;
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acpi_handle handle;
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struct acpi_pci_driver *driver;
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u32 flags, base_flags;
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bool is_osc_granted = false;
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@ -489,16 +488,6 @@ static int acpi_pci_root_add(struct acpi_device *device)
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acpi_device_name(device), acpi_device_bid(device),
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root->segment, &root->secondary);
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/*
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* PCI Routing Table
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* -----------------
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* Evaluate and parse _PRT, if exists.
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*/
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status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
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if (ACPI_SUCCESS(status))
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result = acpi_pci_irq_add_prt(device->handle, root->segment,
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root->secondary.start);
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root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle);
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/*
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@ -623,7 +612,6 @@ out_del_root:
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list_del(&root->node);
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mutex_unlock(&acpi_pci_root_lock);
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acpi_pci_irq_del_prt(root->segment, root->secondary.start);
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end:
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kfree(root);
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return result;
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@ -631,8 +619,6 @@ end:
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static int acpi_pci_root_remove(struct acpi_device *device, int type)
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{
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acpi_status status;
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acpi_handle handle;
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struct acpi_pci_root *root = acpi_driver_data(device);
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struct acpi_pci_driver *driver;
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@ -647,10 +633,6 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
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device_set_run_wake(root->bus->bridge, false);
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pci_acpi_remove_bus_pm_notifier(device);
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status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
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if (ACPI_SUCCESS(status))
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acpi_pci_irq_del_prt(root->segment, root->secondary.start);
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pci_remove_root_bus(root->bus);
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mutex_lock(&acpi_pci_root_lock);
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@ -325,25 +325,6 @@ static void pci_acpi_setup(struct device *dev)
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struct pci_dev *pci_dev = to_pci_dev(dev);
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acpi_handle handle = ACPI_HANDLE(dev);
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struct acpi_device *adev;
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acpi_status status;
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acpi_handle dummy;
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/*
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* Evaluate and parse _PRT, if exists. This code allows parsing of
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* _PRT objects within the scope of non-bridge devices. Note that
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* _PRTs within the scope of a PCI bridge assume the bridge's
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* subordinate bus number.
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*
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* TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
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*/
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status = acpi_get_handle(handle, METHOD_NAME__PRT, &dummy);
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if (ACPI_SUCCESS(status)) {
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unsigned char bus;
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bus = pci_dev->subordinate ?
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pci_dev->subordinate->number : pci_dev->bus->number;
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acpi_pci_irq_add_prt(handle, pci_domain_nr(pci_dev->bus), bus);
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}
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acpi_power_resource_register_device(dev, handle);
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if (acpi_bus_get_device(handle, &adev) || !adev->wakeup.flags.valid)
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@ -359,7 +340,6 @@ static void pci_acpi_setup(struct device *dev)
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static void pci_acpi_cleanup(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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acpi_handle handle = ACPI_HANDLE(dev);
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struct acpi_device *adev;
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@ -369,10 +349,6 @@ static void pci_acpi_cleanup(struct device *dev)
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pci_acpi_remove_pm_notifier(adev);
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}
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acpi_power_resource_unregister_device(dev, handle);
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if (pci_dev->subordinate)
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acpi_pci_irq_del_prt(pci_domain_nr(pci_dev->bus),
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pci_dev->subordinate->number);
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}
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static struct acpi_bus_type acpi_pci_bus = {
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@ -90,11 +90,6 @@ int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
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int *polarity, char **name);
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int acpi_pci_link_free_irq(acpi_handle handle);
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/* ACPI PCI Interrupt Routing (pci_irq.c) */
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int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus);
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void acpi_pci_irq_del_prt(int segment, int bus);
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/* ACPI PCI Device Binding (pci_bind.c) */
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struct pci_bus;
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