Root/drivers/acpi/pci_irq.c

1/*
2 * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
7 * (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
8 * Bjorn Helgaas <bjorn.helgaas@hp.com>
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 */
28
29
30#include <linux/dmi.h>
31#include <linux/kernel.h>
32#include <linux/module.h>
33#include <linux/init.h>
34#include <linux/types.h>
35#include <linux/spinlock.h>
36#include <linux/pm.h>
37#include <linux/pci.h>
38#include <linux/acpi.h>
39#include <linux/slab.h>
40#include <acpi/acpi_bus.h>
41#include <acpi/acpi_drivers.h>
42
43#define PREFIX "ACPI: "
44
45#define _COMPONENT ACPI_PCI_COMPONENT
46ACPI_MODULE_NAME("pci_irq");
47
48struct acpi_prt_entry {
49    struct list_head list;
50    struct acpi_pci_id id;
51    u8 pin;
52    acpi_handle link;
53    u32 index; /* GSI, or link _CRS index */
54};
55
56static LIST_HEAD(acpi_prt_list);
57static DEFINE_SPINLOCK(acpi_prt_lock);
58
59static inline char pin_name(int pin)
60{
61    return 'A' + pin - 1;
62}
63
64/* --------------------------------------------------------------------------
65                         PCI IRQ Routing Table (PRT) Support
66   -------------------------------------------------------------------------- */
67
68static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
69                              int pin)
70{
71    struct acpi_prt_entry *entry;
72    int segment = pci_domain_nr(dev->bus);
73    int bus = dev->bus->number;
74    int device = PCI_SLOT(dev->devfn);
75
76    spin_lock(&acpi_prt_lock);
77    list_for_each_entry(entry, &acpi_prt_list, list) {
78        if ((segment == entry->id.segment)
79            && (bus == entry->id.bus)
80            && (device == entry->id.device)
81            && (pin == entry->pin)) {
82            spin_unlock(&acpi_prt_lock);
83            return entry;
84        }
85    }
86    spin_unlock(&acpi_prt_lock);
87    return NULL;
88}
89
90/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
91static const struct dmi_system_id medion_md9580[] = {
92    {
93        .ident = "Medion MD9580-F laptop",
94        .matches = {
95            DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
96            DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
97        },
98    },
99    { }
100};
101
102/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
103static const struct dmi_system_id dell_optiplex[] = {
104    {
105        .ident = "Dell Optiplex GX1",
106        .matches = {
107            DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
108            DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
109        },
110    },
111    { }
112};
113
114/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
115static const struct dmi_system_id hp_t5710[] = {
116    {
117        .ident = "HP t5710",
118        .matches = {
119            DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
120            DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
121            DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
122        },
123    },
124    { }
125};
126
127struct prt_quirk {
128    const struct dmi_system_id *system;
129    unsigned int segment;
130    unsigned int bus;
131    unsigned int device;
132    unsigned char pin;
133    const char *source; /* according to BIOS */
134    const char *actual_source;
135};
136
137#define PCI_INTX_PIN(c) (c - 'A' + 1)
138
139/*
140 * These systems have incorrect _PRT entries. The BIOS claims the PCI
141 * interrupt at the listed segment/bus/device/pin is connected to the first
142 * link device, but it is actually connected to the second.
143 */
144static const struct prt_quirk prt_quirks[] = {
145    { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
146        "\\_SB_.PCI0.ISA_.LNKA",
147        "\\_SB_.PCI0.ISA_.LNKB"},
148    { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
149        "\\_SB_.LNKB",
150        "\\_SB_.LNKA"},
151    { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
152        "\\_SB_.PCI0.LNK1",
153        "\\_SB_.PCI0.LNK3"},
154};
155
156static void do_prt_fixups(struct acpi_prt_entry *entry,
157              struct acpi_pci_routing_table *prt)
158{
159    int i;
160    const struct prt_quirk *quirk;
161
162    for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
163        quirk = &prt_quirks[i];
164
165        /* All current quirks involve link devices, not GSIs */
166        if (!prt->source)
167            continue;
168
169        if (dmi_check_system(quirk->system) &&
170            entry->id.segment == quirk->segment &&
171            entry->id.bus == quirk->bus &&
172            entry->id.device == quirk->device &&
173            entry->pin == quirk->pin &&
174            !strcmp(prt->source, quirk->source) &&
175            strlen(prt->source) >= strlen(quirk->actual_source)) {
176            printk(KERN_WARNING PREFIX "firmware reports "
177                "%04x:%02x:%02x PCI INT %c connected to %s; "
178                "changing to %s\n",
179                entry->id.segment, entry->id.bus,
180                entry->id.device, pin_name(entry->pin),
181                prt->source, quirk->actual_source);
182            strcpy(prt->source, quirk->actual_source);
183        }
184    }
185}
186
187static int acpi_pci_irq_add_entry(acpi_handle handle, struct pci_bus *bus,
188                  struct acpi_pci_routing_table *prt)
189{
190    struct acpi_prt_entry *entry;
191
192    entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
193    if (!entry)
194        return -ENOMEM;
195
196    /*
197     * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
198     * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
199     * it here.
200     */
201    entry->id.segment = pci_domain_nr(bus);
202    entry->id.bus = bus->number;
203    entry->id.device = (prt->address >> 16) & 0xFFFF;
204    entry->pin = prt->pin + 1;
205
206    do_prt_fixups(entry, prt);
207
208    entry->index = prt->source_index;
209
210    /*
211     * Type 1: Dynamic
212     * ---------------
213     * The 'source' field specifies the PCI interrupt link device used to
214     * configure the IRQ assigned to this slot|dev|pin. The 'source_index'
215     * indicates which resource descriptor in the resource template (of
216     * the link device) this interrupt is allocated from.
217     *
218     * NOTE: Don't query the Link Device for IRQ information at this time
219     * because Link Device enumeration may not have occurred yet
220     * (e.g. exists somewhere 'below' this _PRT entry in the ACPI
221     * namespace).
222     */
223    if (prt->source[0])
224        acpi_get_handle(handle, prt->source, &entry->link);
225
226    /*
227     * Type 2: Static
228     * --------------
229     * The 'source' field is NULL, and the 'source_index' field specifies
230     * the IRQ value, which is hardwired to specific interrupt inputs on
231     * the interrupt controller.
232     */
233
234    ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
235                  " %04x:%02x:%02x[%c] -> %s[%d]\n",
236                  entry->id.segment, entry->id.bus,
237                  entry->id.device, pin_name(entry->pin),
238                  prt->source, entry->index));
239
240    spin_lock(&acpi_prt_lock);
241    list_add_tail(&entry->list, &acpi_prt_list);
242    spin_unlock(&acpi_prt_lock);
243
244    return 0;
245}
246
247int acpi_pci_irq_add_prt(acpi_handle handle, struct pci_bus *bus)
248{
249    acpi_status status;
250    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
251    struct acpi_pci_routing_table *entry;
252
253    /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
254    status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
255    if (ACPI_FAILURE(status))
256        return -ENODEV;
257
258    printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
259           (char *) buffer.pointer);
260
261    kfree(buffer.pointer);
262
263    buffer.length = ACPI_ALLOCATE_BUFFER;
264    buffer.pointer = NULL;
265
266    status = acpi_get_irq_routing_table(handle, &buffer);
267    if (ACPI_FAILURE(status)) {
268        ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
269                acpi_format_exception(status)));
270        kfree(buffer.pointer);
271        return -ENODEV;
272    }
273
274    entry = buffer.pointer;
275    while (entry && (entry->length > 0)) {
276        acpi_pci_irq_add_entry(handle, bus, entry);
277        entry = (struct acpi_pci_routing_table *)
278            ((unsigned long)entry + entry->length);
279    }
280
281    kfree(buffer.pointer);
282    return 0;
283}
284
285void acpi_pci_irq_del_prt(struct pci_bus *bus)
286{
287    struct acpi_prt_entry *entry, *tmp;
288
289    printk(KERN_DEBUG
290           "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n",
291           pci_domain_nr(bus), bus->number);
292    spin_lock(&acpi_prt_lock);
293    list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) {
294        if (pci_domain_nr(bus) == entry->id.segment
295            && bus->number == entry->id.bus) {
296            list_del(&entry->list);
297            kfree(entry);
298        }
299    }
300    spin_unlock(&acpi_prt_lock);
301}
302
303/* --------------------------------------------------------------------------
304                          PCI Interrupt Routing Support
305   -------------------------------------------------------------------------- */
306#ifdef CONFIG_X86_IO_APIC
307extern int noioapicquirk;
308extern int noioapicreroute;
309
310static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
311{
312    struct pci_bus *bus_it;
313
314    for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
315        if (!bus_it->self)
316            return 0;
317        if (bus_it->self->irq_reroute_variant)
318            return bus_it->self->irq_reroute_variant;
319    }
320    return 0;
321}
322
323/*
324 * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ
325 * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does
326 * during interrupt handling). When this INTx generation cannot be disabled,
327 * we reroute these interrupts to their legacy equivalent to get rid of
328 * spurious interrupts.
329 */
330static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
331                       struct acpi_prt_entry *entry)
332{
333    if (noioapicquirk || noioapicreroute) {
334        return 0;
335    } else {
336        switch (bridge_has_boot_interrupt_variant(dev->bus)) {
337        case 0:
338            /* no rerouting necessary */
339            return 0;
340        case INTEL_IRQ_REROUTE_VARIANT:
341            /*
342             * Remap according to INTx routing table in 6700PXH
343             * specs, intel order number 302628-002, section
344             * 2.15.2. Other chipsets (80332, ...) have the same
345             * mapping and are handled here as well.
346             */
347            dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy "
348                 "IRQ %d\n", entry->index,
349                 (entry->index % 4) + 16);
350            entry->index = (entry->index % 4) + 16;
351            return 1;
352        default:
353            dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy "
354                 "IRQ: unknown mapping\n", entry->index);
355            return -1;
356        }
357    }
358}
359#endif /* CONFIG_X86_IO_APIC */
360
361static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
362{
363    struct acpi_prt_entry *entry;
364    struct pci_dev *bridge;
365    u8 bridge_pin, orig_pin = pin;
366
367    entry = acpi_pci_irq_find_prt_entry(dev, pin);
368    if (entry) {
369#ifdef CONFIG_X86_IO_APIC
370        acpi_reroute_boot_interrupt(dev, entry);
371#endif /* CONFIG_X86_IO_APIC */
372        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
373                  pci_name(dev), pin_name(pin)));
374        return entry;
375    }
376
377    /*
378     * Attempt to derive an IRQ for this device from a parent bridge's
379     * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
380     */
381    bridge = dev->bus->self;
382    while (bridge) {
383        pin = pci_swizzle_interrupt_pin(dev, pin);
384
385        if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
386            /* PC card has the same IRQ as its cardbridge */
387            bridge_pin = bridge->pin;
388            if (!bridge_pin) {
389                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
390                          "No interrupt pin configured for device %s\n",
391                          pci_name(bridge)));
392                return NULL;
393            }
394            pin = bridge_pin;
395        }
396
397        entry = acpi_pci_irq_find_prt_entry(bridge, pin);
398        if (entry) {
399            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
400                     "Derived GSI for %s INT %c from %s\n",
401                     pci_name(dev), pin_name(orig_pin),
402                     pci_name(bridge)));
403            return entry;
404        }
405
406        dev = bridge;
407        bridge = dev->bus->self;
408    }
409
410    dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
411         pin_name(orig_pin));
412    return NULL;
413}
414
415int acpi_pci_irq_enable(struct pci_dev *dev)
416{
417    struct acpi_prt_entry *entry;
418    int gsi;
419    u8 pin;
420    int triggering = ACPI_LEVEL_SENSITIVE;
421    int polarity = ACPI_ACTIVE_LOW;
422    char *link = NULL;
423    char link_desc[16];
424    int rc;
425
426    pin = dev->pin;
427    if (!pin) {
428        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
429                  "No interrupt pin configured for device %s\n",
430                  pci_name(dev)));
431        return 0;
432    }
433
434    entry = acpi_pci_irq_lookup(dev, pin);
435    if (!entry) {
436        /*
437         * IDE legacy mode controller IRQs are magic. Why do compat
438         * extensions always make such a nasty mess.
439         */
440        if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
441                (dev->class & 0x05) == 0)
442            return 0;
443    }
444
445    if (entry) {
446        if (entry->link)
447            gsi = acpi_pci_link_allocate_irq(entry->link,
448                             entry->index,
449                             &triggering, &polarity,
450                             &link);
451        else
452            gsi = entry->index;
453    } else
454        gsi = -1;
455
456    /*
457     * No IRQ known to the ACPI subsystem - maybe the BIOS /
458     * driver reported one, then use it. Exit in any case.
459     */
460    if (gsi < 0) {
461        u32 dev_gsi;
462        dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
463        /* Interrupt Line values above 0xF are forbidden */
464        if (dev->irq > 0 && (dev->irq <= 0xF) &&
465            (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
466            printk(" - using ISA IRQ %d\n", dev->irq);
467            acpi_register_gsi(&dev->dev, dev_gsi,
468                      ACPI_LEVEL_SENSITIVE,
469                      ACPI_ACTIVE_LOW);
470            return 0;
471        } else {
472            printk("\n");
473            return 0;
474        }
475    }
476
477    rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
478    if (rc < 0) {
479        dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
480             pin_name(pin));
481        return rc;
482    }
483    dev->irq = rc;
484
485    if (link)
486        snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
487    else
488        link_desc[0] = '\0';
489
490    dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
491        pin_name(pin), link_desc, gsi,
492        (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
493        (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
494
495    return 0;
496}
497
498/* FIXME: implement x86/x86_64 version */
499void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
500{
501}
502
503void acpi_pci_irq_disable(struct pci_dev *dev)
504{
505    struct acpi_prt_entry *entry;
506    int gsi;
507    u8 pin;
508
509    pin = dev->pin;
510    if (!pin)
511        return;
512
513    entry = acpi_pci_irq_lookup(dev, pin);
514    if (!entry)
515        return;
516
517    if (entry->link)
518        gsi = acpi_pci_link_free_irq(entry->link);
519    else
520        gsi = entry->index;
521
522    /*
523     * TBD: It might be worth clearing dev->irq by magic constant
524     * (e.g. PCI_UNDEFINED_IRQ).
525     */
526
527    dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
528    acpi_unregister_gsi(gsi);
529}
530

Archive Download this file

Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9



interactive