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alistair23-linux/arch/x86/pci/irq.c
Rafael J. Wysocki 9e8ce4b96b Revert "x86/PCI: Refine the way to release PCI IRQ resources" 
Commit b4b55cda58 (Refine the way to release PCI IRQ resources)
introduced a regression in the PCI IRQ resource management by causing
the IRQ resource of a device, established when pci_enabled_device()
is called on a fully disabled device, to be released when the driver
is unbound from the device, regardless of the enable_cnt.

This leads to the situation that an ill-behaved driver can now make a
device unusable to subsequent drivers by an imbalance in their use of
pci_enable/disable_device().  That is a serious problem for secondary
drivers like vfio-pci, which are innocent of the transgressions of
the previous driver.

Since the solution of this problem is not immediate and requires
further discussion, revert commit b4b55cda58 and the issue it was
supposed to address (a bug related to xen-pciback) will be taken
care of in a different way going forward.

Reported-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-03-20 14:56:19 +01:00

1280 lines
33 KiB
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Raw Blame History

/*
* Low-Level PCI Support for PC -- Routing of Interrupts
*
* (c) 1999--2000 Martin Mares <mj@ucw.cz>
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/dmi.h>
#include <linux/io.h>
#include <linux/smp.h>
#include <asm/io_apic.h>
#include <linux/irq.h>
#include <linux/acpi.h>
#include <asm/pci_x86.h>
#define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
#define PIRQ_VERSION 0x0100
static int broken_hp_bios_irq9;
static int acer_tm360_irqrouting;
static struct irq_routing_table *pirq_table;
static int pirq_enable_irq(struct pci_dev *dev);
static void pirq_disable_irq(struct pci_dev *dev);
/*
* Never use: 0, 1, 2 (timer, keyboard, and cascade)
* Avoid using: 13, 14 and 15 (FP error and IDE).
* Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
*/
unsigned int pcibios_irq_mask = 0xfff8;
static int pirq_penalty[16] = {
1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
0, 0, 0, 0, 1000, 100000, 100000, 100000
};
struct irq_router {
char *name;
u16 vendor, device;
int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq,
int new);
};
struct irq_router_handler {
u16 vendor;
int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device);
};
int (*pcibios_enable_irq)(struct pci_dev *dev) = pirq_enable_irq;
void (*pcibios_disable_irq)(struct pci_dev *dev) = pirq_disable_irq;
/*
* Check passed address for the PCI IRQ Routing Table signature
* and perform checksum verification.
*/
static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr)
{
struct irq_routing_table *rt;
int i;
u8 sum;
rt = (struct irq_routing_table *) addr;
if (rt->signature != PIRQ_SIGNATURE ||
rt->version != PIRQ_VERSION ||
rt->size % 16 ||
rt->size < sizeof(struct irq_routing_table))
return NULL;
sum = 0;
for (i = 0; i < rt->size; i++)
sum += addr[i];
if (!sum) {
DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%p\n",
rt);
return rt;
}
return NULL;
}
/*
* Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
*/
static struct irq_routing_table * __init pirq_find_routing_table(void)
{
u8 *addr;
struct irq_routing_table *rt;
if (pirq_table_addr) {
rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
if (rt)
return rt;
printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
}
for (addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
rt = pirq_check_routing_table(addr);
if (rt)
return rt;
}
return NULL;
}
/*
* If we have a IRQ routing table, use it to search for peer host
* bridges. It's a gross hack, but since there are no other known
* ways how to get a list of buses, we have to go this way.
*/
static void __init pirq_peer_trick(void)
{
struct irq_routing_table *rt = pirq_table;
u8 busmap[256];
int i;
struct irq_info *e;
memset(busmap, 0, sizeof(busmap));
for (i = 0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
e = &rt->slots[i];
#ifdef DEBUG
{
int j;
DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
for (j = 0; j < 4; j++)
DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
DBG("\n");
}
#endif
busmap[e->bus] = 1;
}
for (i = 1; i < 256; i++) {
if (!busmap[i] || pci_find_bus(0, i))
continue;
pcibios_scan_root(i);
}
pcibios_last_bus = -1;
}
/*
* Code for querying and setting of IRQ routes on various interrupt routers.
*/
void eisa_set_level_irq(unsigned int irq)
{
unsigned char mask = 1 << (irq & 7);
unsigned int port = 0x4d0 + (irq >> 3);
unsigned char val;
static u16 eisa_irq_mask;
if (irq >= 16 || (1 << irq) & eisa_irq_mask)
return;
eisa_irq_mask |= (1 << irq);
printk(KERN_DEBUG "PCI: setting IRQ %u as level-triggered\n", irq);
val = inb(port);
if (!(val & mask)) {
DBG(KERN_DEBUG " -> edge");
outb(val | mask, port);
}
}
/*
* Common IRQ routing practice: nibbles in config space,
* offset by some magic constant.
*/
static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
{
u8 x;
unsigned reg = offset + (nr >> 1);
pci_read_config_byte(router, reg, &x);
return (nr & 1) ? (x >> 4) : (x & 0xf);
}
static void write_config_nybble(struct pci_dev *router, unsigned offset,
unsigned nr, unsigned int val)
{
u8 x;
unsigned reg = offset + (nr >> 1);
pci_read_config_byte(router, reg, &x);
x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
pci_write_config_byte(router, reg, x);
}
/*
* ALI pirq entries are damn ugly, and completely undocumented.
* This has been figured out from pirq tables, and it's not a pretty
* picture.
*/
static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
WARN_ON_ONCE(pirq > 16);
return irqmap[read_config_nybble(router, 0x48, pirq-1)];
}
static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
unsigned int val = irqmap[irq];
WARN_ON_ONCE(pirq > 16);
if (val) {
write_config_nybble(router, 0x48, pirq-1, val);
return 1;
}
return 0;
}
/*
* The Intel PIIX4 pirq rules are fairly simple: "pirq" is
* just a pointer to the config space.
*/
static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
u8 x;
pci_read_config_byte(router, pirq, &x);
return (x < 16) ? x : 0;
}
static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
pci_write_config_byte(router, pirq, irq);
return 1;
}
/*
* The VIA pirq rules are nibble-based, like ALI,
* but without the ugly irq number munging.
* However, PIRQD is in the upper instead of lower 4 bits.
*/
static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
}
static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
return 1;
}
/*
* The VIA pirq rules are nibble-based, like ALI,
* but without the ugly irq number munging.
* However, for 82C586, nibble map is different .
*/
static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
WARN_ON_ONCE(pirq > 5);
return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
}
static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
WARN_ON_ONCE(pirq > 5);
write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
return 1;
}
/*
* ITE 8330G pirq rules are nibble-based
* FIXME: pirqmap may be { 1, 0, 3, 2 },
* 2+3 are both mapped to irq 9 on my system
*/
static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
WARN_ON_ONCE(pirq > 4);
return read_config_nybble(router, 0x43, pirqmap[pirq-1]);
}
static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
WARN_ON_ONCE(pirq > 4);
write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
return 1;
}
/*
* OPTI: high four bits are nibble pointer..
* I wonder what the low bits do?
*/
static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
return read_config_nybble(router, 0xb8, pirq >> 4);
}
static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
write_config_nybble(router, 0xb8, pirq >> 4, irq);
return 1;
}
/*
* Cyrix: nibble offset 0x5C
* 0x5C bits 7:4 is INTB bits 3:0 is INTA
* 0x5D bits 7:4 is INTD bits 3:0 is INTC
*/
static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
return read_config_nybble(router, 0x5C, (pirq-1)^1);
}
static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
return 1;
}
/*
* PIRQ routing for SiS 85C503 router used in several SiS chipsets.
* We have to deal with the following issues here:
* - vendors have different ideas about the meaning of link values
* - some onboard devices (integrated in the chipset) have special
* links and are thus routed differently (i.e. not via PCI INTA-INTD)
* - different revision of the router have a different layout for
* the routing registers, particularly for the onchip devices
*
* For all routing registers the common thing is we have one byte
* per routeable link which is defined as:
* bit 7 IRQ mapping enabled (0) or disabled (1)
* bits [6:4] reserved (sometimes used for onchip devices)
* bits [3:0] IRQ to map to
* allowed: 3-7, 9-12, 14-15
* reserved: 0, 1, 2, 8, 13
*
* The config-space registers located at 0x41/0x42/0x43/0x44 are
* always used to route the normal PCI INT A/B/C/D respectively.
* Apparently there are systems implementing PCI routing table using
* link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
* We try our best to handle both link mappings.
*
* Currently (2003-05-21) it appears most SiS chipsets follow the
* definition of routing registers from the SiS-5595 southbridge.
* According to the SiS 5595 datasheets the revision id's of the
* router (ISA-bridge) should be 0x01 or 0xb0.
*
* Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
* Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
* They seem to work with the current routing code. However there is
* some concern because of the two USB-OHCI HCs (original SiS 5595
* had only one). YMMV.
*
* Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
*
* 0x61: IDEIRQ:
* bits [6:5] must be written 01
* bit 4 channel-select primary (0), secondary (1)
*
* 0x62: USBIRQ:
* bit 6 OHCI function disabled (0), enabled (1)
*
* 0x6a: ACPI/SCI IRQ: bits 4-6 reserved
*
* 0x7e: Data Acq. Module IRQ - bits 4-6 reserved
*
* We support USBIRQ (in addition to INTA-INTD) and keep the
* IDE, ACPI and DAQ routing untouched as set by the BIOS.
*
* Currently the only reported exception is the new SiS 65x chipset
* which includes the SiS 69x southbridge. Here we have the 85C503
* router revision 0x04 and there are changes in the register layout
* mostly related to the different USB HCs with USB 2.0 support.
*
* Onchip routing for router rev-id 0x04 (try-and-error observation)
*
* 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs
* bit 6-4 are probably unused, not like 5595
*/
#define PIRQ_SIS_IRQ_MASK 0x0f
#define PIRQ_SIS_IRQ_DISABLE 0x80
#define PIRQ_SIS_USB_ENABLE 0x40
static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
u8 x;
int reg;
reg = pirq;
if (reg >= 0x01 && reg <= 0x04)
reg += 0x40;
pci_read_config_byte(router, reg, &x);
return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
}
static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
u8 x;
int reg;
reg = pirq;
if (reg >= 0x01 && reg <= 0x04)
reg += 0x40;
pci_read_config_byte(router, reg, &x);
x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
pci_write_config_byte(router, reg, x);
return 1;
}
/*
* VLSI: nibble offset 0x74 - educated guess due to routing table and
* config space of VLSI 82C534 PCI-bridge/router (1004:0102)
* Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
* devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
* for the busbridge to the docking station.
*/
static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
WARN_ON_ONCE(pirq >= 9);
if (pirq > 8) {
dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq);
return 0;
}
return read_config_nybble(router, 0x74, pirq-1);
}
static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
WARN_ON_ONCE(pirq >= 9);
if (pirq > 8) {
dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq);
return 0;
}
write_config_nybble(router, 0x74, pirq-1, irq);
return 1;
}
/*
* ServerWorks: PCI interrupts mapped to system IRQ lines through Index
* and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
* format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
* register is a straight binary coding of desired PIC IRQ (low nibble).
*
* The 'link' value in the PIRQ table is already in the correct format
* for the Index register. There are some special index values:
* 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
* and 0x03 for SMBus.
*/
static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
outb(pirq, 0xc00);
return inb(0xc01) & 0xf;
}
static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev,
int pirq, int irq)
{
outb(pirq, 0xc00);
outb(irq, 0xc01);
return 1;
}
/* Support for AMD756 PCI IRQ Routing
* Jhon H. Caicedo <jhcaiced@osso.org.co>
* Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
* Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
* The AMD756 pirq rules are nibble-based
* offset 0x56 0-3 PIRQA 4-7 PIRQB
* offset 0x57 0-3 PIRQC 4-7 PIRQD
*/
static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
u8 irq;
irq = 0;
if (pirq <= 4)
irq = read_config_nybble(router, 0x56, pirq - 1);
dev_info(&dev->dev,
"AMD756: dev [%04x:%04x], router PIRQ %d get IRQ %d\n",
dev->vendor, dev->device, pirq, irq);
return irq;
}
static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
dev_info(&dev->dev,
"AMD756: dev [%04x:%04x], router PIRQ %d set IRQ %d\n",
dev->vendor, dev->device, pirq, irq);
if (pirq <= 4)
write_config_nybble(router, 0x56, pirq - 1, irq);
return 1;
}
/*
* PicoPower PT86C523
*/
static int pirq_pico_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
outb(0x10 + ((pirq - 1) >> 1), 0x24);
return ((pirq - 1) & 1) ? (inb(0x26) >> 4) : (inb(0x26) & 0xf);
}
static int pirq_pico_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
int irq)
{
unsigned int x;
outb(0x10 + ((pirq - 1) >> 1), 0x24);
x = inb(0x26);
x = ((pirq - 1) & 1) ? ((x & 0x0f) | (irq << 4)) : ((x & 0xf0) | (irq));
outb(x, 0x26);
return 1;
}
#ifdef CONFIG_PCI_BIOS
static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
struct pci_dev *bridge;
int pin = pci_get_interrupt_pin(dev, &bridge);
return pcibios_set_irq_routing(bridge, pin - 1, irq);
}
#endif
static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
static struct pci_device_id __initdata pirq_440gx[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
{ },
};
/* 440GX has a proprietary PIRQ router -- don't use it */
if (pci_dev_present(pirq_440gx))
return 0;
switch (device) {
case PCI_DEVICE_ID_INTEL_82371FB_0:
case PCI_DEVICE_ID_INTEL_82371SB_0:
case PCI_DEVICE_ID_INTEL_82371AB_0:
case PCI_DEVICE_ID_INTEL_82371MX:
case PCI_DEVICE_ID_INTEL_82443MX_0:
case PCI_DEVICE_ID_INTEL_82801AA_0:
case PCI_DEVICE_ID_INTEL_82801AB_0:
case PCI_DEVICE_ID_INTEL_82801BA_0:
case PCI_DEVICE_ID_INTEL_82801BA_10:
case PCI_DEVICE_ID_INTEL_82801CA_0:
case PCI_DEVICE_ID_INTEL_82801CA_12:
case PCI_DEVICE_ID_INTEL_82801DB_0:
case PCI_DEVICE_ID_INTEL_82801E_0:
case PCI_DEVICE_ID_INTEL_82801EB_0:
case PCI_DEVICE_ID_INTEL_ESB_1:
case PCI_DEVICE_ID_INTEL_ICH6_0:
case PCI_DEVICE_ID_INTEL_ICH6_1:
case PCI_DEVICE_ID_INTEL_ICH7_0:
case PCI_DEVICE_ID_INTEL_ICH7_1:
case PCI_DEVICE_ID_INTEL_ICH7_30:
case PCI_DEVICE_ID_INTEL_ICH7_31:
case PCI_DEVICE_ID_INTEL_TGP_LPC:
case PCI_DEVICE_ID_INTEL_ESB2_0:
case PCI_DEVICE_ID_INTEL_ICH8_0:
case PCI_DEVICE_ID_INTEL_ICH8_1:
case PCI_DEVICE_ID_INTEL_ICH8_2:
case PCI_DEVICE_ID_INTEL_ICH8_3:
case PCI_DEVICE_ID_INTEL_ICH8_4:
case PCI_DEVICE_ID_INTEL_ICH9_0:
case PCI_DEVICE_ID_INTEL_ICH9_1:
case PCI_DEVICE_ID_INTEL_ICH9_2:
case PCI_DEVICE_ID_INTEL_ICH9_3:
case PCI_DEVICE_ID_INTEL_ICH9_4:
case PCI_DEVICE_ID_INTEL_ICH9_5:
case PCI_DEVICE_ID_INTEL_EP80579_0:
case PCI_DEVICE_ID_INTEL_ICH10_0:
case PCI_DEVICE_ID_INTEL_ICH10_1:
case PCI_DEVICE_ID_INTEL_ICH10_2:
case PCI_DEVICE_ID_INTEL_ICH10_3:
case PCI_DEVICE_ID_INTEL_PATSBURG_LPC_0:
case PCI_DEVICE_ID_INTEL_PATSBURG_LPC_1:
r->name = "PIIX/ICH";
r->get = pirq_piix_get;
r->set = pirq_piix_set;
return 1;
}
if ((device >= PCI_DEVICE_ID_INTEL_5_3400_SERIES_LPC_MIN &&
device <= PCI_DEVICE_ID_INTEL_5_3400_SERIES_LPC_MAX)
|| (device >= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MIN &&
device <= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MAX)
|| (device >= PCI_DEVICE_ID_INTEL_DH89XXCC_LPC_MIN &&
device <= PCI_DEVICE_ID_INTEL_DH89XXCC_LPC_MAX)
|| (device >= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MIN &&
device <= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MAX)) {
r->name = "PIIX/ICH";
r->get = pirq_piix_get;
r->set = pirq_piix_set;
return 1;
}
return 0;
}
static __init int via_router_probe(struct irq_router *r,
struct pci_dev *router, u16 device)
{
/* FIXME: We should move some of the quirk fixup stuff here */
/*
* workarounds for some buggy BIOSes
*/
if (device == PCI_DEVICE_ID_VIA_82C586_0) {
switch (router->device) {
case PCI_DEVICE_ID_VIA_82C686:
/*
* Asus k7m bios wrongly reports 82C686A
* as 586-compatible
*/
device = PCI_DEVICE_ID_VIA_82C686;
break;
case PCI_DEVICE_ID_VIA_8235:
/**
* Asus a7v-x bios wrongly reports 8235
* as 586-compatible
*/
device = PCI_DEVICE_ID_VIA_8235;
break;
case PCI_DEVICE_ID_VIA_8237:
/**
* Asus a7v600 bios wrongly reports 8237
* as 586-compatible
*/
device = PCI_DEVICE_ID_VIA_8237;
break;
}
}
switch (device) {
case PCI_DEVICE_ID_VIA_82C586_0:
r->name = "VIA";
r->get = pirq_via586_get;
r->set = pirq_via586_set;
return 1;
case PCI_DEVICE_ID_VIA_82C596:
case PCI_DEVICE_ID_VIA_82C686:
case PCI_DEVICE_ID_VIA_8231:
case PCI_DEVICE_ID_VIA_8233A:
case PCI_DEVICE_ID_VIA_8235:
case PCI_DEVICE_ID_VIA_8237:
/* FIXME: add new ones for 8233/5 */
r->name = "VIA";
r->get = pirq_via_get;
r->set = pirq_via_set;
return 1;
}
return 0;
}
static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_VLSI_82C534:
r->name = "VLSI 82C534";
r->get = pirq_vlsi_get;
r->set = pirq_vlsi_set;
return 1;
}
return 0;
}
static __init int serverworks_router_probe(struct irq_router *r,
struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_SERVERWORKS_OSB4:
case PCI_DEVICE_ID_SERVERWORKS_CSB5:
r->name = "ServerWorks";
r->get = pirq_serverworks_get;
r->set = pirq_serverworks_set;
return 1;
}
return 0;
}
static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
if (device != PCI_DEVICE_ID_SI_503)
return 0;
r->name = "SIS";
r->get = pirq_sis_get;
r->set = pirq_sis_set;
return 1;
}
static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_CYRIX_5520:
r->name = "NatSemi";
r->get = pirq_cyrix_get;
r->set = pirq_cyrix_set;
return 1;
}
return 0;
}
static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_OPTI_82C700:
r->name = "OPTI";
r->get = pirq_opti_get;
r->set = pirq_opti_set;
return 1;
}
return 0;
}
static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_ITE_IT8330G_0:
r->name = "ITE";
r->get = pirq_ite_get;
r->set = pirq_ite_set;
return 1;
}
return 0;
}
static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_AL_M1533:
case PCI_DEVICE_ID_AL_M1563:
r->name = "ALI";
r->get = pirq_ali_get;
r->set = pirq_ali_set;
return 1;
}
return 0;
}
static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_AMD_VIPER_740B:
r->name = "AMD756";
break;
case PCI_DEVICE_ID_AMD_VIPER_7413:
r->name = "AMD766";
break;
case PCI_DEVICE_ID_AMD_VIPER_7443:
r->name = "AMD768";
break;
default:
return 0;
}
r->get = pirq_amd756_get;
r->set = pirq_amd756_set;
return 1;
}
static __init int pico_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_PICOPOWER_PT86C523:
r->name = "PicoPower PT86C523";
r->get = pirq_pico_get;
r->set = pirq_pico_set;
return 1;
case PCI_DEVICE_ID_PICOPOWER_PT86C523BBP:
r->name = "PicoPower PT86C523 rev. BB+";
r->get = pirq_pico_get;
r->set = pirq_pico_set;
return 1;
}
return 0;
}
static __initdata struct irq_router_handler pirq_routers[] = {
{ PCI_VENDOR_ID_INTEL, intel_router_probe },
{ PCI_VENDOR_ID_AL, ali_router_probe },
{ PCI_VENDOR_ID_ITE, ite_router_probe },
{ PCI_VENDOR_ID_VIA, via_router_probe },
{ PCI_VENDOR_ID_OPTI, opti_router_probe },
{ PCI_VENDOR_ID_SI, sis_router_probe },
{ PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
{ PCI_VENDOR_ID_VLSI, vlsi_router_probe },
{ PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
{ PCI_VENDOR_ID_AMD, amd_router_probe },
{ PCI_VENDOR_ID_PICOPOWER, pico_router_probe },
/* Someone with docs needs to add the ATI Radeon IGP */
{ 0, NULL }
};
static struct irq_router pirq_router;
static struct pci_dev *pirq_router_dev;
/*
* FIXME: should we have an option to say "generic for
* chipset" ?
*/
static void __init pirq_find_router(struct irq_router *r)
{
struct irq_routing_table *rt = pirq_table;
struct irq_router_handler *h;
#ifdef CONFIG_PCI_BIOS
if (!rt->signature) {
printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
r->set = pirq_bios_set;
r->name = "BIOS";
return;
}
#endif
/* Default unless a driver reloads it */
r->name = "default";
r->get = NULL;
r->set = NULL;
DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for [%04x:%04x]\n",
rt->rtr_vendor, rt->rtr_device);
pirq_router_dev = pci_get_bus_and_slot(rt->rtr_bus, rt->rtr_devfn);
if (!pirq_router_dev) {
DBG(KERN_DEBUG "PCI: Interrupt router not found at "
"%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
return;
}
for (h = pirq_routers; h->vendor; h++) {
/* First look for a router match */
if (rt->rtr_vendor == h->vendor &&
h->probe(r, pirq_router_dev, rt->rtr_device))
break;
/* Fall back to a device match */
if (pirq_router_dev->vendor == h->vendor &&
h->probe(r, pirq_router_dev, pirq_router_dev->device))
break;
}
dev_info(&pirq_router_dev->dev, "%s IRQ router [%04x:%04x]\n",
pirq_router.name,
pirq_router_dev->vendor, pirq_router_dev->device);
/* The device remains referenced for the kernel lifetime */
}
static struct irq_info *pirq_get_info(struct pci_dev *dev)
{
struct irq_routing_table *rt = pirq_table;
int entries = (rt->size - sizeof(struct irq_routing_table)) /
sizeof(struct irq_info);
struct irq_info *info;
for (info = rt->slots; entries--; info++)
if (info->bus == dev->bus->number &&
PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
return info;
return NULL;
}
static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
{
u8 pin;
struct irq_info *info;
int i, pirq, newirq;
int irq = 0;
u32 mask;
struct irq_router *r = &pirq_router;
struct pci_dev *dev2 = NULL;
char *msg = NULL;
/* Find IRQ pin */
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (!pin) {
dev_dbg(&dev->dev, "no interrupt pin\n");
return 0;
}
if (io_apic_assign_pci_irqs)
return 0;
/* Find IRQ routing entry */
if (!pirq_table)
return 0;
info = pirq_get_info(dev);
if (!info) {
dev_dbg(&dev->dev, "PCI INT %c not found in routing table\n",
'A' + pin - 1);
return 0;
}
pirq = info->irq[pin - 1].link;
mask = info->irq[pin - 1].bitmap;
if (!pirq) {
dev_dbg(&dev->dev, "PCI INT %c not routed\n", 'A' + pin - 1);
return 0;
}
dev_dbg(&dev->dev, "PCI INT %c -> PIRQ %02x, mask %04x, excl %04x",
'A' + pin - 1, pirq, mask, pirq_table->exclusive_irqs);
mask &= pcibios_irq_mask;
/* Work around broken HP Pavilion Notebooks which assign USB to
IRQ 9 even though it is actually wired to IRQ 11 */
if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
dev->irq = 11;
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
r->set(pirq_router_dev, dev, pirq, 11);
}
/* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
if (acer_tm360_irqrouting && dev->irq == 11 &&
dev->vendor == PCI_VENDOR_ID_O2) {
pirq = 0x68;
mask = 0x400;
dev->irq = r->get(pirq_router_dev, dev, pirq);
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
}
/*
* Find the best IRQ to assign: use the one
* reported by the device if possible.
*/
newirq = dev->irq;
if (newirq && !((1 << newirq) & mask)) {
if (pci_probe & PCI_USE_PIRQ_MASK)
newirq = 0;
else
dev_warn(&dev->dev, "IRQ %d doesn't match PIRQ mask "
"%#x; try pci=usepirqmask\n", newirq, mask);
}
if (!newirq && assign) {
for (i = 0; i < 16; i++) {
if (!(mask & (1 << i)))
continue;
if (pirq_penalty[i] < pirq_penalty[newirq] &&
can_request_irq(i, IRQF_SHARED))
newirq = i;
}
}
dev_dbg(&dev->dev, "PCI INT %c -> newirq %d", 'A' + pin - 1, newirq);
/* Check if it is hardcoded */
if ((pirq & 0xf0) == 0xf0) {
irq = pirq & 0xf;
msg = "hardcoded";
} else if (r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask))) {
msg = "found";
eisa_set_level_irq(irq);
} else if (newirq && r->set &&
(dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
if (r->set(pirq_router_dev, dev, pirq, newirq)) {
eisa_set_level_irq(newirq);
msg = "assigned";
irq = newirq;
}
}
if (!irq) {
if (newirq && mask == (1 << newirq)) {
msg = "guessed";
irq = newirq;
} else {
dev_dbg(&dev->dev, "can't route interrupt\n");
return 0;
}
}
dev_info(&dev->dev, "%s PCI INT %c -> IRQ %d\n", msg, 'A' + pin - 1, irq);
/* Update IRQ for all devices with the same pirq value */
for_each_pci_dev(dev2) {
pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
if (!pin)
continue;
info = pirq_get_info(dev2);
if (!info)
continue;
if (info->irq[pin - 1].link == pirq) {
/*
* We refuse to override the dev->irq
* information. Give a warning!
*/
if (dev2->irq && dev2->irq != irq && \
(!(pci_probe & PCI_USE_PIRQ_MASK) || \
((1 << dev2->irq) & mask))) {
#ifndef CONFIG_PCI_MSI
dev_info(&dev2->dev, "IRQ routing conflict: "
"have IRQ %d, want IRQ %d\n",
dev2->irq, irq);
#endif
continue;
}
dev2->irq = irq;
pirq_penalty[irq]++;
if (dev != dev2)
dev_info(&dev->dev, "sharing IRQ %d with %s\n",
irq, pci_name(dev2));
}
}
return 1;
}
void __init pcibios_fixup_irqs(void)
{
struct pci_dev *dev = NULL;
u8 pin;
DBG(KERN_DEBUG "PCI: IRQ fixup\n");
for_each_pci_dev(dev) {
/*
* If the BIOS has set an out of range IRQ number, just
* ignore it. Also keep track of which IRQ's are
* already in use.
*/
if (dev->irq >= 16) {
dev_dbg(&dev->dev, "ignoring bogus IRQ %d\n", dev->irq);
dev->irq = 0;
}
/*
* If the IRQ is already assigned to a PCI device,
* ignore its ISA use penalty
*/
if (pirq_penalty[dev->irq] >= 100 &&
pirq_penalty[dev->irq] < 100000)
pirq_penalty[dev->irq] = 0;
pirq_penalty[dev->irq]++;
}
if (io_apic_assign_pci_irqs)
return;
dev = NULL;
for_each_pci_dev(dev) {
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (!pin)
continue;
/*
* Still no IRQ? Try to lookup one...
*/
if (!dev->irq)
pcibios_lookup_irq(dev, 0);
}
}
/*
* Work around broken HP Pavilion Notebooks which assign USB to
* IRQ 9 even though it is actually wired to IRQ 11
*/
static int __init fix_broken_hp_bios_irq9(const struct dmi_system_id *d)
{
if (!broken_hp_bios_irq9) {
broken_hp_bios_irq9 = 1;
printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
d->ident);
}
return 0;
}
/*
* Work around broken Acer TravelMate 360 Notebooks which assign
* Cardbus to IRQ 11 even though it is actually wired to IRQ 10
*/
static int __init fix_acer_tm360_irqrouting(const struct dmi_system_id *d)
{
if (!acer_tm360_irqrouting) {
acer_tm360_irqrouting = 1;
printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
d->ident);
}
return 0;
}
static struct dmi_system_id __initdata pciirq_dmi_table[] = {
{
.callback = fix_broken_hp_bios_irq9,
.ident = "HP Pavilion N5400 Series Laptop",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
DMI_MATCH(DMI_PRODUCT_VERSION,
"HP Pavilion Notebook Model GE"),
DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
},
},
{
.callback = fix_acer_tm360_irqrouting,
.ident = "Acer TravelMate 36x Laptop",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
},
},
{ }
};
void __init pcibios_irq_init(void)
{
DBG(KERN_DEBUG "PCI: IRQ init\n");
if (raw_pci_ops == NULL)
return;
dmi_check_system(pciirq_dmi_table);
pirq_table = pirq_find_routing_table();
#ifdef CONFIG_PCI_BIOS
if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
pirq_table = pcibios_get_irq_routing_table();
#endif
if (pirq_table) {
pirq_peer_trick();
pirq_find_router(&pirq_router);
if (pirq_table->exclusive_irqs) {
int i;
for (i = 0; i < 16; i++)
if (!(pirq_table->exclusive_irqs & (1 << i)))
pirq_penalty[i] += 100;
}
/*
* If we're using the I/O APIC, avoid using the PCI IRQ
* routing table
*/
if (io_apic_assign_pci_irqs)
pirq_table = NULL;
}
x86_init.pci.fixup_irqs();
if (io_apic_assign_pci_irqs && pci_routeirq) {
struct pci_dev *dev = NULL;
/*
* PCI IRQ routing is set up by pci_enable_device(), but we
* also do it here in case there are still broken drivers that
* don't use pci_enable_device().
*/
printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
for_each_pci_dev(dev)
pirq_enable_irq(dev);
}
}
static void pirq_penalize_isa_irq(int irq, int active)
{
/*
* If any ISAPnP device reports an IRQ in its list of possible
* IRQ's, we try to avoid assigning it to PCI devices.
*/
if (irq < 16) {
if (active)
pirq_penalty[irq] += 1000;
else
pirq_penalty[irq] += 100;
}
}
void pcibios_penalize_isa_irq(int irq, int active)
{
#ifdef CONFIG_ACPI
if (!acpi_noirq)
acpi_penalize_isa_irq(irq, active);
else
#endif
pirq_penalize_isa_irq(irq, active);
}
static int pirq_enable_irq(struct pci_dev *dev)
{
u8 pin = 0;
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (pin && !pcibios_lookup_irq(dev, 1)) {
char *msg = "";
if (!io_apic_assign_pci_irqs && dev->irq)
return 0;
if (io_apic_assign_pci_irqs) {
#ifdef CONFIG_X86_IO_APIC
struct pci_dev *temp_dev;
int irq;
if (dev->irq_managed && dev->irq > 0)
return 0;
irq = IO_APIC_get_PCI_irq_vector(dev->bus->number,
PCI_SLOT(dev->devfn), pin - 1);
/*
* Busses behind bridges are typically not listed in the MP-table.
* In this case we have to look up the IRQ based on the parent bus,
* parent slot, and pin number. The SMP code detects such bridged
* busses itself so we should get into this branch reliably.
*/
temp_dev = dev;
while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
struct pci_dev *bridge = dev->bus->self;
pin = pci_swizzle_interrupt_pin(dev, pin);
irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
PCI_SLOT(bridge->devfn),
pin - 1);
if (irq >= 0)
dev_warn(&dev->dev, "using bridge %s "
"INT %c to get IRQ %d\n",
pci_name(bridge), 'A' + pin - 1,
irq);
dev = bridge;
}
dev = temp_dev;
if (irq >= 0) {
dev->irq_managed = 1;
dev->irq = irq;
dev_info(&dev->dev, "PCI->APIC IRQ transform: "
"INT %c -> IRQ %d\n", 'A' + pin - 1, irq);
return 0;
} else
msg = "; probably buggy MP table";
#endif
} else if (pci_probe & PCI_BIOS_IRQ_SCAN)
msg = "";
else
msg = "; please try using pci=biosirq";
/*
* With IDE legacy devices the IRQ lookup failure is not
* a problem..
*/
if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
!(dev->class & 0x5))
return 0;
dev_warn(&dev->dev, "can't find IRQ for PCI INT %c%s\n",
'A' + pin - 1, msg);
}
return 0;
}
bool mp_should_keep_irq(struct device *dev)
{
if (dev->power.is_prepared)
return true;
#ifdef CONFIG_PM
if (dev->power.runtime_status == RPM_SUSPENDING)
return true;
#endif
return false;
}
static void pirq_disable_irq(struct pci_dev *dev)
{
if (io_apic_assign_pci_irqs && !mp_should_keep_irq(&dev->dev) &&
dev->irq_managed && dev->irq) {
mp_unmap_irq(dev->irq);
dev->irq = 0;
dev->irq_managed = 0;
}
}
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