Commit 8b955b0d authored by Eric W. Biederman's avatar Eric W. Biederman Committed by Linus Torvalds

[PATCH] Initial generic hypertransport interrupt support

This patch implements two functions ht_create_irq and ht_destroy_irq for
use by drivers.  Several other functions are implemented as helpers for
arch specific irq_chip handlers.

The driver for the card I tested this on isn't yet ready to be merged.
However this code is and hypertransport irqs are in use in a few other
places in the kernel.  Not that any of this will get merged before 2.6.19

Because the ipath-ht400 is slightly out of spec this code will need to be
generalized to work there.

I think all of the powerpc uses are for a plain interrupt controller in a
chipset so support for native hypertransport devices is a little less
interesting.

However I think this is a half way decent model on how to separate arch
specific and generic helper code, and I think this is a functional model of
how to get the architecture dependencies out of the msi code.

[akpm@osdl.org: Kconfig fix]
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Cc: Greg KH <greg@kroah.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent e78d0169
......@@ -40,6 +40,7 @@
#include <asm/i8259.h>
#include <asm/nmi.h>
#include <asm/msidef.h>
#include <asm/hypertransport.h>
#include <mach_apic.h>
#include <mach_apicdef.h>
......@@ -2518,6 +2519,95 @@ struct msi_ops arch_msi_ops = {
#endif /* CONFIG_PCI_MSI */
/*
* Hypertransport interrupt support
*/
#ifdef CONFIG_HT_IRQ
#ifdef CONFIG_SMP
static void target_ht_irq(unsigned int irq, unsigned int dest)
{
u32 low, high;
low = read_ht_irq_low(irq);
high = read_ht_irq_high(irq);
low &= ~(HT_IRQ_LOW_DEST_ID_MASK);
high &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
low |= HT_IRQ_LOW_DEST_ID(dest);
high |= HT_IRQ_HIGH_DEST_ID(dest);
write_ht_irq_low(irq, low);
write_ht_irq_high(irq, high);
}
static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
{
unsigned int dest;
cpumask_t tmp;
cpus_and(tmp, mask, cpu_online_map);
if (cpus_empty(tmp))
tmp = TARGET_CPUS;
cpus_and(mask, tmp, CPU_MASK_ALL);
dest = cpu_mask_to_apicid(mask);
target_ht_irq(irq, dest);
set_native_irq_info(irq, mask);
}
#endif
static struct hw_interrupt_type ht_irq_chip = {
.name = "PCI-HT",
.mask = mask_ht_irq,
.unmask = unmask_ht_irq,
.ack = ack_ioapic_irq,
#ifdef CONFIG_SMP
.set_affinity = set_ht_irq_affinity,
#endif
.retrigger = ioapic_retrigger_irq,
};
int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
{
int vector;
vector = assign_irq_vector(irq);
if (vector >= 0) {
u32 low, high;
unsigned dest;
cpumask_t tmp;
cpus_clear(tmp);
cpu_set(vector >> 8, tmp);
dest = cpu_mask_to_apicid(tmp);
high = HT_IRQ_HIGH_DEST_ID(dest);
low = HT_IRQ_LOW_BASE |
HT_IRQ_LOW_DEST_ID(dest) |
HT_IRQ_LOW_VECTOR(vector) |
((INT_DEST_MODE == 0) ?
HT_IRQ_LOW_DM_PHYSICAL :
HT_IRQ_LOW_DM_LOGICAL) |
HT_IRQ_LOW_RQEOI_EDGE |
((INT_DELIVERY_MODE != dest_LowestPrio) ?
HT_IRQ_LOW_MT_FIXED :
HT_IRQ_LOW_MT_ARBITRATED) |
HT_IRQ_LOW_IRQ_MASKED;
write_ht_irq_low(irq, low);
write_ht_irq_high(irq, high);
set_irq_chip_and_handler(irq, &ht_irq_chip, handle_edge_irq);
}
return vector;
}
#endif /* CONFIG_HT_IRQ */
/* --------------------------------------------------------------------------
ACPI-based IOAPIC Configuration
-------------------------------------------------------------------------- */
......
......@@ -43,6 +43,7 @@
#include <asm/dma.h>
#include <asm/nmi.h>
#include <asm/msidef.h>
#include <asm/hypertransport.h>
static int assign_irq_vector(int irq, cpumask_t mask);
......@@ -1772,6 +1773,101 @@ struct msi_ops arch_msi_ops = {
#endif
/*
* Hypertransport interrupt support
*/
#ifdef CONFIG_HT_IRQ
#ifdef CONFIG_SMP
static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
{
u32 low, high;
low = read_ht_irq_low(irq);
high = read_ht_irq_high(irq);
low &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
high &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
low |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
high |= HT_IRQ_HIGH_DEST_ID(dest);
write_ht_irq_low(irq, low);
write_ht_irq_high(irq, high);
}
static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
{
unsigned int dest;
cpumask_t tmp;
int vector;
cpus_and(tmp, mask, cpu_online_map);
if (cpus_empty(tmp))
tmp = TARGET_CPUS;
cpus_and(mask, tmp, CPU_MASK_ALL);
vector = assign_irq_vector(irq, mask);
if (vector < 0)
return;
cpus_clear(tmp);
cpu_set(vector >> 8, tmp);
dest = cpu_mask_to_apicid(tmp);
target_ht_irq(irq, dest, vector & 0xff);
set_native_irq_info(irq, mask);
}
#endif
static struct hw_interrupt_type ht_irq_chip = {
.name = "PCI-HT",
.mask = mask_ht_irq,
.unmask = unmask_ht_irq,
.ack = ack_apic_edge,
#ifdef CONFIG_SMP
.set_affinity = set_ht_irq_affinity,
#endif
.retrigger = ioapic_retrigger_irq,
};
int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
{
int vector;
vector = assign_irq_vector(irq, TARGET_CPUS);
if (vector >= 0) {
u32 low, high;
unsigned dest;
cpumask_t tmp;
cpus_clear(tmp);
cpu_set(vector >> 8, tmp);
dest = cpu_mask_to_apicid(tmp);
high = HT_IRQ_HIGH_DEST_ID(dest);
low = HT_IRQ_LOW_BASE |
HT_IRQ_LOW_DEST_ID(dest) |
HT_IRQ_LOW_VECTOR(vector) |
((INT_DEST_MODE == 0) ?
HT_IRQ_LOW_DM_PHYSICAL :
HT_IRQ_LOW_DM_LOGICAL) |
HT_IRQ_LOW_RQEOI_EDGE |
((INT_DELIVERY_MODE != dest_LowestPrio) ?
HT_IRQ_LOW_MT_FIXED :
HT_IRQ_LOW_MT_ARBITRATED);
write_ht_irq_low(irq, low);
write_ht_irq_high(irq, high);
set_irq_chip_and_handler(irq, &ht_irq_chip, handle_edge_irq);
}
return vector;
}
#endif /* CONFIG_HT_IRQ */
/* --------------------------------------------------------------------------
ACPI-based IOAPIC Configuration
-------------------------------------------------------------------------- */
......
......@@ -52,3 +52,12 @@ config PCI_DEBUG
When in doubt, say N.
config HT_IRQ
bool "Interrupts on hypertransport devices"
default y
depends on PCI_MSI
depends on X86_LOCAL_APIC && X86_IO_APIC
help
This allows native hypertransport devices to use interrupts.
If unsure say Y.
......@@ -26,6 +26,7 @@ obj-$(CONFIG_PPC32) += setup-irq.o
obj-$(CONFIG_PPC64) += setup-bus.o
obj-$(CONFIG_MIPS) += setup-bus.o setup-irq.o
obj-$(CONFIG_X86_VISWS) += setup-irq.o
obj-$(CONFIG_HT_IRQ) += htirq.o
msiobj-y := msi.o
msiobj-$(CONFIG_IA64) += msi-apic.o
......
/*
* File: htirq.c
* Purpose: Hypertransport Interrupt Capability
*
* Copyright (C) 2006 Linux Networx
* Copyright (C) Eric Biederman <ebiederman@lnxi.com>
*/
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/gfp.h>
/* Global ht irq lock.
*
* This is needed to serialize access to the data port in hypertransport
* irq capability.
*
* With multiple simultaneous hypertransport irq devices it might pay
* to make this more fine grained. But start with simple, stupid, and correct.
*/
static DEFINE_SPINLOCK(ht_irq_lock);
struct ht_irq_cfg {
struct pci_dev *dev;
unsigned pos;
unsigned idx;
};
void write_ht_irq_low(unsigned int irq, u32 data)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
unsigned long flags;
spin_lock_irqsave(&ht_irq_lock, flags);
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
pci_write_config_dword(cfg->dev, cfg->pos + 4, data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
}
void write_ht_irq_high(unsigned int irq, u32 data)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
unsigned long flags;
spin_lock_irqsave(&ht_irq_lock, flags);
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
pci_write_config_dword(cfg->dev, cfg->pos + 4, data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
}
u32 read_ht_irq_low(unsigned int irq)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
unsigned long flags;
u32 data;
spin_lock_irqsave(&ht_irq_lock, flags);
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
pci_read_config_dword(cfg->dev, cfg->pos + 4, &data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
return data;
}
u32 read_ht_irq_high(unsigned int irq)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
unsigned long flags;
u32 data;
spin_lock_irqsave(&ht_irq_lock, flags);
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
pci_read_config_dword(cfg->dev, cfg->pos + 4, &data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
return data;
}
void mask_ht_irq(unsigned int irq)
{
struct ht_irq_cfg *cfg;
unsigned long flags;
u32 data;
cfg = get_irq_data(irq);
spin_lock_irqsave(&ht_irq_lock, flags);
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
pci_read_config_dword(cfg->dev, cfg->pos + 4, &data);
data |= 1;
pci_write_config_dword(cfg->dev, cfg->pos + 4, data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
}
void unmask_ht_irq(unsigned int irq)
{
struct ht_irq_cfg *cfg;
unsigned long flags;
u32 data;
cfg = get_irq_data(irq);
spin_lock_irqsave(&ht_irq_lock, flags);
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
pci_read_config_dword(cfg->dev, cfg->pos + 4, &data);
data &= ~1;
pci_write_config_dword(cfg->dev, cfg->pos + 4, data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
}
/**
* ht_create_irq - create an irq and attach it to a device.
* @dev: The hypertransport device to find the irq capability on.
* @idx: Which of the possible irqs to attach to.
*
* ht_create_irq is needs to be called for all hypertransport devices
* that generate irqs.
*
* The irq number of the new irq or a negative error value is returned.
*/
int ht_create_irq(struct pci_dev *dev, int idx)
{
struct ht_irq_cfg *cfg;
unsigned long flags;
u32 data;
int max_irq;
int pos;
int irq;
pos = pci_find_capability(dev, PCI_CAP_ID_HT);
while (pos) {
u8 subtype;
pci_read_config_byte(dev, pos + 3, &subtype);
if (subtype == HT_CAPTYPE_IRQ)
break;
pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_HT);
}
if (!pos)
return -EINVAL;
/* Verify the idx I want to use is in range */
spin_lock_irqsave(&ht_irq_lock, flags);
pci_write_config_byte(dev, pos + 2, 1);
pci_read_config_dword(dev, pos + 4, &data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
max_irq = (data >> 16) & 0xff;
if ( idx > max_irq)
return -EINVAL;
cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return -ENOMEM;
cfg->dev = dev;
cfg->pos = pos;
cfg->idx = 0x10 + (idx * 2);
irq = create_irq();
if (irq < 0) {
kfree(cfg);
return -EBUSY;
}
set_irq_data(irq, cfg);
if (arch_setup_ht_irq(irq, dev) < 0) {
ht_destroy_irq(irq);
return -EBUSY;
}
return irq;
}
/**
* ht_destroy_irq - destroy an irq created with ht_create_irq
*
* This reverses ht_create_irq removing the specified irq from
* existence. The irq should be free before this happens.
*/
void ht_destroy_irq(unsigned int irq)
{
struct ht_irq_cfg *cfg;
cfg = get_irq_data(irq);
set_irq_chip(irq, NULL);
set_irq_data(irq, NULL);
destroy_irq(irq);
kfree(cfg);
}
EXPORT_SYMBOL(ht_create_irq);
EXPORT_SYMBOL(ht_destroy_irq);
#ifndef ASM_HYPERTRANSPORT_H
#define ASM_HYPERTRANSPORT_H
/*
* Constants for x86 Hypertransport Interrupts.
*/
#define HT_IRQ_LOW_BASE 0xf8000000
#define HT_IRQ_LOW_VECTOR_SHIFT 16
#define HT_IRQ_LOW_VECTOR_MASK 0x00ff0000
#define HT_IRQ_LOW_VECTOR(v) (((v) << HT_IRQ_LOW_VECTOR_SHIFT) & HT_IRQ_LOW_VECTOR_MASK)
#define HT_IRQ_LOW_DEST_ID_SHIFT 8
#define HT_IRQ_LOW_DEST_ID_MASK 0x0000ff00
#define HT_IRQ_LOW_DEST_ID(v) (((v) << HT_IRQ_LOW_DEST_ID_SHIFT) & HT_IRQ_LOW_DEST_ID_MASK)
#define HT_IRQ_LOW_DM_PHYSICAL 0x0000000
#define HT_IRQ_LOW_DM_LOGICAL 0x0000040
#define HT_IRQ_LOW_RQEOI_EDGE 0x0000000
#define HT_IRQ_LOW_RQEOI_LEVEL 0x0000020
#define HT_IRQ_LOW_MT_FIXED 0x0000000
#define HT_IRQ_LOW_MT_ARBITRATED 0x0000004
#define HT_IRQ_LOW_MT_SMI 0x0000008
#define HT_IRQ_LOW_MT_NMI 0x000000c
#define HT_IRQ_LOW_MT_INIT 0x0000010
#define HT_IRQ_LOW_MT_STARTUP 0x0000014
#define HT_IRQ_LOW_MT_EXTINT 0x0000018
#define HT_IRQ_LOW_MT_LINT1 0x000008c
#define HT_IRQ_LOW_MT_LINT0 0x0000098
#define HT_IRQ_LOW_IRQ_MASKED 0x0000001
#define HT_IRQ_HIGH_DEST_ID_SHIFT 0
#define HT_IRQ_HIGH_DEST_ID_MASK 0x00ffffff
#define HT_IRQ_HIGH_DEST_ID(v) ((((v) >> 8) << HT_IRQ_HIGH_DEST_ID_SHIFT) & HT_IRQ_HIGH_DEST_ID_MASK)
#endif /* ASM_HYPERTRANSPORT_H */
#ifndef ASM_HYPERTRANSPORT_H
#define ASM_HYPERTRANSPORT_H
/*
* Constants for x86 Hypertransport Interrupts.
*/
#define HT_IRQ_LOW_BASE 0xf8000000
#define HT_IRQ_LOW_VECTOR_SHIFT 16
#define HT_IRQ_LOW_VECTOR_MASK 0x00ff0000
#define HT_IRQ_LOW_VECTOR(v) (((v) << HT_IRQ_LOW_VECTOR_SHIFT) & HT_IRQ_LOW_VECTOR_MASK)
#define HT_IRQ_LOW_DEST_ID_SHIFT 8
#define HT_IRQ_LOW_DEST_ID_MASK 0x0000ff00
#define HT_IRQ_LOW_DEST_ID(v) (((v) << HT_IRQ_LOW_DEST_ID_SHIFT) & HT_IRQ_LOW_DEST_ID_MASK)
#define HT_IRQ_LOW_DM_PHYSICAL 0x0000000
#define HT_IRQ_LOW_DM_LOGICAL 0x0000040
#define HT_IRQ_LOW_RQEOI_EDGE 0x0000000
#define HT_IRQ_LOW_RQEOI_LEVEL 0x0000020
#define HT_IRQ_LOW_MT_FIXED 0x0000000
#define HT_IRQ_LOW_MT_ARBITRATED 0x0000004
#define HT_IRQ_LOW_MT_SMI 0x0000008
#define HT_IRQ_LOW_MT_NMI 0x000000c
#define HT_IRQ_LOW_MT_INIT 0x0000010
#define HT_IRQ_LOW_MT_STARTUP 0x0000014
#define HT_IRQ_LOW_MT_EXTINT 0x0000018
#define HT_IRQ_LOW_MT_LINT1 0x000008c
#define HT_IRQ_LOW_MT_LINT0 0x0000098
#define HT_IRQ_LOW_IRQ_MASKED 0x0000001
#define HT_IRQ_HIGH_DEST_ID_SHIFT 0
#define HT_IRQ_HIGH_DEST_ID_MASK 0x00ffffff
#define HT_IRQ_HIGH_DEST_ID(v) ((((v) >> 8) << HT_IRQ_HIGH_DEST_ID_SHIFT) & HT_IRQ_HIGH_DEST_ID_MASK)
#endif /* ASM_HYPERTRANSPORT_H */
......@@ -681,6 +681,23 @@ extern int msi_register(struct msi_ops *ops);
#endif
#ifdef CONFIG_HT_IRQ
/* Helper functions.. */
void write_ht_irq_low(unsigned int irq, u32 data);
void write_ht_irq_high(unsigned int irq, u32 data);
u32 read_ht_irq_low(unsigned int irq);
u32 read_ht_irq_high(unsigned int irq);
void mask_ht_irq(unsigned int irq);
void unmask_ht_irq(unsigned int irq);
/* The functions a driver should call */
int ht_create_irq(struct pci_dev *dev, int idx);
void ht_destroy_irq(unsigned int irq);
/* The arch hook for getting things started */
int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev);
#endif /* CONFIG_HT_IRQ */
extern void pci_block_user_cfg_access(struct pci_dev *dev);
extern void pci_unblock_user_cfg_access(struct pci_dev *dev);
......
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