* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
+ * (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
#define _COMPONENT ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_irq");
-static struct acpi_prt_list acpi_prt;
+struct acpi_prt_entry {
+ struct list_head list;
+ struct acpi_pci_id id;
+ u8 pin;
+ acpi_handle link;
+ u32 index; /* GSI, or link _CRS index */
+};
+
+static LIST_HEAD(acpi_prt_list);
static DEFINE_SPINLOCK(acpi_prt_lock);
+static inline char pin_name(int pin)
+{
+ return 'A' + pin - 1;
+}
+
/* --------------------------------------------------------------------------
PCI IRQ Routing Table (PRT) Support
-------------------------------------------------------------------------- */
-static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
- int bus,
- int device, int pin)
+static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
+ int pin)
{
- struct acpi_prt_entry *entry = NULL;
-
- if (!acpi_prt.count)
- return NULL;
+ struct acpi_prt_entry *entry;
+ int segment = pci_domain_nr(dev->bus);
+ int bus = dev->bus->number;
+ int device = PCI_SLOT(dev->devfn);
- /*
- * Parse through all PRT entries looking for a match on the specified
- * PCI device's segment, bus, device, and pin (don't care about func).
- *
- */
spin_lock(&acpi_prt_lock);
- list_for_each_entry(entry, &acpi_prt.entries, node) {
+ list_for_each_entry(entry, &acpi_prt_list, list) {
if ((segment == entry->id.segment)
&& (bus == entry->id.bus)
&& (device == entry->id.device)
return entry;
}
}
-
spin_unlock(&acpi_prt_lock);
return NULL;
}
/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
-static struct dmi_system_id medion_md9580[] = {
+static const struct dmi_system_id medion_md9580[] = {
{
.ident = "Medion MD9580-F laptop",
.matches = {
};
/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
-static struct dmi_system_id dell_optiplex[] = {
+static const struct dmi_system_id dell_optiplex[] = {
{
.ident = "Dell Optiplex GX1",
.matches = {
};
/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
-static struct dmi_system_id hp_t5710[] = {
+static const struct dmi_system_id hp_t5710[] = {
{
.ident = "HP t5710",
.matches = {
};
struct prt_quirk {
- struct dmi_system_id *system;
+ const struct dmi_system_id *system;
unsigned int segment;
unsigned int bus;
unsigned int device;
unsigned char pin;
- char *source; /* according to BIOS */
- char *actual_source;
+ const char *source; /* according to BIOS */
+ const char *actual_source;
};
+#define PCI_INTX_PIN(c) (c - 'A' + 1)
+
/*
* These systems have incorrect _PRT entries. The BIOS claims the PCI
* interrupt at the listed segment/bus/device/pin is connected to the first
* link device, but it is actually connected to the second.
*/
-static struct prt_quirk prt_quirks[] = {
- { medion_md9580, 0, 0, 9, 'A',
+static const struct prt_quirk prt_quirks[] = {
+ { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
"\\_SB_.PCI0.ISA_.LNKA",
"\\_SB_.PCI0.ISA_.LNKB"},
- { dell_optiplex, 0, 0, 0xd, 'A',
+ { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
"\\_SB_.LNKB",
"\\_SB_.LNKA"},
- { hp_t5710, 0, 0, 1, 'A',
+ { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
"\\_SB_.PCI0.LNK1",
"\\_SB_.PCI0.LNK3"},
};
-static void
-do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
+static void do_prt_fixups(struct acpi_prt_entry *entry,
+ struct acpi_pci_routing_table *prt)
{
int i;
- struct prt_quirk *quirk;
+ const struct prt_quirk *quirk;
for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
quirk = &prt_quirks[i];
entry->id.segment == quirk->segment &&
entry->id.bus == quirk->bus &&
entry->id.device == quirk->device &&
- entry->pin + 'A' == quirk->pin &&
+ entry->pin == quirk->pin &&
!strcmp(prt->source, quirk->source) &&
strlen(prt->source) >= strlen(quirk->actual_source)) {
printk(KERN_WARNING PREFIX "firmware reports "
"%04x:%02x:%02x PCI INT %c connected to %s; "
"changing to %s\n",
entry->id.segment, entry->id.bus,
- entry->id.device, 'A' + entry->pin,
+ entry->id.device, pin_name(entry->pin),
prt->source, quirk->actual_source);
strcpy(prt->source, quirk->actual_source);
}
}
}
-static int
-acpi_pci_irq_add_entry(acpi_handle handle,
- int segment, int bus, struct acpi_pci_routing_table *prt)
+static int acpi_pci_irq_add_entry(acpi_handle handle, int segment, int bus,
+ struct acpi_pci_routing_table *prt)
{
- struct acpi_prt_entry *entry = NULL;
-
-
- if (!prt)
- return -EINVAL;
+ struct acpi_prt_entry *entry;
entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
+ /*
+ * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
+ * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
+ * it here.
+ */
entry->id.segment = segment;
entry->id.bus = bus;
entry->id.device = (prt->address >> 16) & 0xFFFF;
- entry->id.function = prt->address & 0xFFFF;
- entry->pin = prt->pin;
+ entry->pin = prt->pin + 1;
do_prt_fixups(entry, prt);
+ entry->index = prt->source_index;
+
/*
* Type 1: Dynamic
* ---------------
* (e.g. exists somewhere 'below' this _PRT entry in the ACPI
* namespace).
*/
- if (prt->source[0]) {
- acpi_get_handle(handle, prt->source, &entry->link.handle);
- entry->link.index = prt->source_index;
- }
+ if (prt->source[0])
+ acpi_get_handle(handle, prt->source, &entry->link);
+
/*
* Type 2: Static
* --------------
* the IRQ value, which is hardwired to specific interrupt inputs on
* the interrupt controller.
*/
- else
- entry->link.index = prt->source_index;
ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
- " %02X:%02X:%02X[%c] -> %s[%d]\n",
+ " %04x:%02x:%02x[%c] -> %s[%d]\n",
entry->id.segment, entry->id.bus,
- entry->id.device, ('A' + entry->pin), prt->source,
- entry->link.index));
+ entry->id.device, pin_name(entry->pin),
+ prt->source, entry->index));
spin_lock(&acpi_prt_lock);
- list_add_tail(&entry->node, &acpi_prt.entries);
- acpi_prt.count++;
+ list_add_tail(&entry->list, &acpi_prt_list);
spin_unlock(&acpi_prt_lock);
return 0;
}
-static void
-acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
-{
- if (segment == entry->id.segment && bus == entry->id.bus) {
- acpi_prt.count--;
- list_del(&entry->node);
- kfree(entry);
- }
-}
-
int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
{
- acpi_status status = AE_OK;
- char *pathname = NULL;
- struct acpi_buffer buffer = { 0, NULL };
- struct acpi_pci_routing_table *prt = NULL;
- struct acpi_pci_routing_table *entry = NULL;
- static int first_time = 1;
-
-
- pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
- if (!pathname)
- return -ENOMEM;
-
- if (first_time) {
- acpi_prt.count = 0;
- INIT_LIST_HEAD(&acpi_prt.entries);
- first_time = 0;
- }
-
- /*
- * NOTE: We're given a 'handle' to the _PRT object's parent device
- * (either a PCI root bridge or PCI-PCI bridge).
- */
+ acpi_status status;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_pci_routing_table *entry;
- buffer.length = ACPI_PATHNAME_MAX;
- buffer.pointer = pathname;
- acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+ /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
+ status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
- pathname);
+ (char *) buffer.pointer);
- /*
- * Evaluate this _PRT and add its entries to our global list (acpi_prt).
- */
+ kfree(buffer.pointer);
- buffer.length = 0;
+ buffer.length = ACPI_ALLOCATE_BUFFER;
buffer.pointer = NULL;
- kfree(pathname);
- status = acpi_get_irq_routing_table(handle, &buffer);
- if (status != AE_BUFFER_OVERFLOW) {
- ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
- acpi_format_exception(status)));
- return -ENODEV;
- }
-
- prt = kzalloc(buffer.length, GFP_KERNEL);
- if (!prt) {
- return -ENOMEM;
- }
- buffer.pointer = prt;
status = acpi_get_irq_routing_table(handle, &buffer);
if (ACPI_FAILURE(status)) {
return -ENODEV;
}
- entry = prt;
-
+ entry = buffer.pointer;
while (entry && (entry->length > 0)) {
acpi_pci_irq_add_entry(handle, segment, bus, entry);
entry = (struct acpi_pci_routing_table *)
((unsigned long)entry + entry->length);
}
- kfree(prt);
-
+ kfree(buffer.pointer);
return 0;
}
void acpi_pci_irq_del_prt(int segment, int bus)
{
- struct list_head *node = NULL, *n = NULL;
- struct acpi_prt_entry *entry = NULL;
-
- if (!acpi_prt.count) {
- return;
- }
+ struct acpi_prt_entry *entry, *tmp;
printk(KERN_DEBUG
- "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", segment,
- bus);
+ "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
+ segment, bus);
spin_lock(&acpi_prt_lock);
- list_for_each_safe(node, n, &acpi_prt.entries) {
- entry = list_entry(node, struct acpi_prt_entry, node);
-
- acpi_pci_irq_del_entry(segment, bus, entry);
+ list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
+ if (segment == entry->id.segment && bus == entry->id.bus) {
+ list_del(&entry->list);
+ kfree(entry);
+ }
}
spin_unlock(&acpi_prt_lock);
}
/* --------------------------------------------------------------------------
PCI Interrupt Routing Support
-------------------------------------------------------------------------- */
-typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
-
-static int
-acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
- int *triggering, int *polarity, char **link)
-{
- int irq;
-
-
- if (entry->link.handle) {
- irq = acpi_pci_link_allocate_irq(entry->link.handle,
- entry->link.index, triggering,
- polarity, link);
- if (irq < 0) {
- printk(KERN_WARNING PREFIX
- "Invalid IRQ link routing entry\n");
- return -1;
- }
- } else {
- irq = entry->link.index;
- *triggering = ACPI_LEVEL_SENSITIVE;
- *polarity = ACPI_ACTIVE_LOW;
- }
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
- return irq;
-}
-
-static int
-acpi_pci_free_irq(struct acpi_prt_entry *entry,
- int *triggering, int *polarity, char **link)
-{
- int irq;
-
- if (entry->link.handle) {
- irq = acpi_pci_link_free_irq(entry->link.handle);
- } else {
- irq = entry->link.index;
- }
- return irq;
-}
-
-#ifdef CONFIG_X86_IO_APIC
-extern int noioapicquirk;
-
-static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
+static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
{
- struct pci_bus *bus_it;
-
- for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
- if (!bus_it->self)
- return 0;
-
- printk(KERN_INFO "vendor=%04x device=%04x\n", bus_it->self->vendor,
- bus_it->self->device);
-
- if (bus_it->self->irq_reroute_variant)
- return bus_it->self->irq_reroute_variant;
- }
- return 0;
-}
-#endif /* CONFIG_X86_IO_APIC */
-
-/*
- * acpi_pci_irq_lookup
- * success: return IRQ >= 0
- * failure: return -1
- */
-static int
-acpi_pci_irq_lookup(struct pci_bus *bus,
- int device,
- int pin,
- int *triggering,
- int *polarity, char **link, irq_lookup_func func)
-{
- struct acpi_prt_entry *entry = NULL;
- int segment = pci_domain_nr(bus);
- int bus_nr = bus->number;
- int ret;
-
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Searching for PRT entry for %02x:%02x:%02x[%c]\n",
- segment, bus_nr, device, ('A' + pin)));
-
- entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
- if (!entry) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n"));
- return -1;
- }
-
- ret = func(entry, triggering, polarity, link);
-
-#ifdef CONFIG_X86_IO_APIC
- /*
- * Some chipsets (e.g. intel 6700PXH) generate a legacy INTx when the
- * IRQ entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel
- * does during interrupt handling). When this INTx generation cannot be
- * disabled, we reroute these interrupts to their legacy equivalent to
- * get rid of spurious interrupts.
- */
- if (!noioapicquirk) {
- switch (bridge_has_boot_interrupt_variant(bus)) {
- case 0:
- /* no rerouting necessary */
- break;
-
- case INTEL_IRQ_REROUTE_VARIANT:
- /*
- * Remap according to INTx routing table in 6700PXH
- * specs, intel order number 302628-002, section
- * 2.15.2. Other chipsets (80332, ...) have the same
- * mapping and are handled here as well.
- */
- printk(KERN_INFO "pci irq %d -> rerouted to legacy "
- "irq %d\n", ret, (ret % 4) + 16);
- ret = (ret % 4) + 16;
- break;
-
- default:
- printk(KERN_INFO "not rerouting irq %d to legacy irq: "
- "unknown mapping\n", ret);
- break;
- }
+ struct acpi_prt_entry *entry;
+ struct pci_dev *bridge;
+ u8 bridge_pin, orig_pin = pin;
+
+ entry = acpi_pci_irq_find_prt_entry(dev, pin);
+ if (entry) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
+ pci_name(dev), pin_name(pin)));
+ return entry;
}
-#endif /* CONFIG_X86_IO_APIC */
-
- return ret;
-}
-
-/*
- * acpi_pci_irq_derive
- * success: return IRQ >= 0
- * failure: return < 0
- */
-static int
-acpi_pci_irq_derive(struct pci_dev *dev,
- int pin,
- int *triggering,
- int *polarity, char **link, irq_lookup_func func)
-{
- struct pci_dev *bridge = dev;
- int irq = -1;
- u8 bridge_pin = 0, orig_pin = pin;
-
-
- if (!dev)
- return -EINVAL;
/*
* Attempt to derive an IRQ for this device from a parent bridge's
* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
*/
- while (irq < 0 && bridge->bus->self) {
- pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
- bridge = bridge->bus->self;
+ bridge = dev->bus->self;
+ while (bridge) {
+ pin = pci_swizzle_interrupt_pin(dev, pin);
if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
/* PC card has the same IRQ as its cardbridge */
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No interrupt pin configured for device %s\n",
pci_name(bridge)));
- return -1;
+ return NULL;
}
- /* Pin is from 0 to 3 */
- bridge_pin--;
pin = bridge_pin;
}
- irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
- pin, triggering, polarity,
- link, func);
- }
+ entry = acpi_pci_irq_find_prt_entry(bridge, pin);
+ if (entry) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Derived GSI for %s INT %c from %s\n",
+ pci_name(dev), pin_name(orig_pin),
+ pci_name(bridge)));
+ return entry;
+ }
- if (irq < 0) {
- dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
- 'A' + orig_pin);
- return -1;
+ dev = bridge;
+ bridge = dev->bus->self;
}
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
- irq, pci_name(dev), pci_name(bridge)));
-
- return irq;
+ dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
+ pin_name(orig_pin));
+ return NULL;
}
-/*
- * acpi_pci_irq_enable
- * success: return 0
- * failure: return < 0
- */
-
int acpi_pci_irq_enable(struct pci_dev *dev)
{
- int irq = 0;
- u8 pin = 0;
+ struct acpi_prt_entry *entry;
+ int gsi;
+ u8 pin;
int triggering = ACPI_LEVEL_SENSITIVE;
int polarity = ACPI_ACTIVE_LOW;
char *link = NULL;
char link_desc[16];
int rc;
-
- if (!dev)
- return -EINVAL;
-
pin = dev->pin;
if (!pin) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
pci_name(dev)));
return 0;
}
- pin--;
-
- if (!dev->bus) {
- dev_err(&dev->dev, "invalid (NULL) 'bus' field\n");
- return -ENODEV;
- }
-
- /*
- * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
- * values override any BIOS-assigned IRQs set during boot.
- */
- irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
- &triggering, &polarity, &link,
- acpi_pci_allocate_irq);
-
- /*
- * If no PRT entry was found, we'll try to derive an IRQ from the
- * device's parent bridge.
- */
- if (irq < 0)
- irq = acpi_pci_irq_derive(dev, pin, &triggering,
- &polarity, &link,
- acpi_pci_allocate_irq);
- if (irq < 0) {
+ entry = acpi_pci_irq_lookup(dev, pin);
+ if (!entry) {
/*
* IDE legacy mode controller IRQs are magic. Why do compat
* extensions always make such a nasty mess.
(dev->class & 0x05) == 0)
return 0;
}
+
+ if (entry) {
+ if (entry->link)
+ gsi = acpi_pci_link_allocate_irq(entry->link,
+ entry->index,
+ &triggering, &polarity,
+ &link);
+ else
+ gsi = entry->index;
+ } else
+ gsi = -1;
+
/*
* No IRQ known to the ACPI subsystem - maybe the BIOS /
* driver reported one, then use it. Exit in any case.
*/
- if (irq < 0) {
- dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin);
+ if (gsi < 0) {
+ dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
/* Interrupt Line values above 0xF are forbidden */
if (dev->irq > 0 && (dev->irq <= 0xF)) {
printk(" - using IRQ %d\n", dev->irq);
}
}
- rc = acpi_register_gsi(irq, triggering, polarity);
+ rc = acpi_register_gsi(gsi, triggering, polarity);
if (rc < 0) {
dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
- 'A' + pin);
+ pin_name(pin));
return rc;
}
dev->irq = rc;
link_desc[0] = '\0';
dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
- 'A' + pin, link_desc, irq,
+ pin_name(pin), link_desc, gsi,
(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
void acpi_pci_irq_disable(struct pci_dev *dev)
{
- int gsi = 0;
- u8 pin = 0;
- int triggering = ACPI_LEVEL_SENSITIVE;
- int polarity = ACPI_ACTIVE_LOW;
-
-
- if (!dev || !dev->bus)
- return;
+ struct acpi_prt_entry *entry;
+ int gsi;
+ u8 pin;
pin = dev->pin;
if (!pin)
return;
- pin--;
- /*
- * First we check the PCI IRQ routing table (PRT) for an IRQ.
- */
- gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
- &triggering, &polarity, NULL,
- acpi_pci_free_irq);
- /*
- * If no PRT entry was found, we'll try to derive an IRQ from the
- * device's parent bridge.
- */
- if (gsi < 0)
- gsi = acpi_pci_irq_derive(dev, pin,
- &triggering, &polarity, NULL,
- acpi_pci_free_irq);
- if (gsi < 0)
+ entry = acpi_pci_irq_lookup(dev, pin);
+ if (!entry)
return;
+ if (entry->link)
+ gsi = acpi_pci_link_free_irq(entry->link);
+ else
+ gsi = entry->index;
+
/*
* TBD: It might be worth clearing dev->irq by magic constant
* (e.g. PCI_UNDEFINED_IRQ).
*/
- dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin);
+ dev_info(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
acpi_unregister_gsi(gsi);
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff