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/*-
* Copyright (c) 2006 Yahoo!, Inc.
* All rights reserved.
* Written by: John Baldwin <jhb@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Support for PCI Message Signalled Interrupts (MSI). MSI interrupts on
* x86 are basically APIC messages that the northbridge delivers directly
* to the local APICs as if they had come from an I/O APIC.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/x86/x86/msi.c 214631 2010-11-01 18:18:46Z jhb $");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/sx.h>
#include <sys/systm.h>
#include <x86/apicreg.h>
#include <machine/cputypes.h>
#include <machine/md_var.h>
#include <machine/frame.h>
#include <machine/intr_machdep.h>
#include <machine/apicvar.h>
#include <machine/specialreg.h>
#include <dev/pci/pcivar.h>
/* Fields in address for Intel MSI messages. */
#define MSI_INTEL_ADDR_DEST 0x000ff000
#define MSI_INTEL_ADDR_RH 0x00000008
# define MSI_INTEL_ADDR_RH_ON 0x00000008
# define MSI_INTEL_ADDR_RH_OFF 0x00000000
#define MSI_INTEL_ADDR_DM 0x00000004
# define MSI_INTEL_ADDR_DM_PHYSICAL 0x00000000
# define MSI_INTEL_ADDR_DM_LOGICAL 0x00000004
/* Fields in data for Intel MSI messages. */
#define MSI_INTEL_DATA_TRGRMOD IOART_TRGRMOD /* Trigger mode. */
# define MSI_INTEL_DATA_TRGREDG IOART_TRGREDG
# define MSI_INTEL_DATA_TRGRLVL IOART_TRGRLVL
#define MSI_INTEL_DATA_LEVEL 0x00004000 /* Polarity. */
# define MSI_INTEL_DATA_DEASSERT 0x00000000
# define MSI_INTEL_DATA_ASSERT 0x00004000
#define MSI_INTEL_DATA_DELMOD IOART_DELMOD /* Delivery mode. */
# define MSI_INTEL_DATA_DELFIXED IOART_DELFIXED
# define MSI_INTEL_DATA_DELLOPRI IOART_DELLOPRI
# define MSI_INTEL_DATA_DELSMI IOART_DELSMI
# define MSI_INTEL_DATA_DELNMI IOART_DELNMI
# define MSI_INTEL_DATA_DELINIT IOART_DELINIT
# define MSI_INTEL_DATA_DELEXINT IOART_DELEXINT
#define MSI_INTEL_DATA_INTVEC IOART_INTVEC /* Interrupt vector. */
/*
* Build Intel MSI message and data values from a source. AMD64 systems
* seem to be compatible, so we use the same function for both.
*/
#define INTEL_ADDR(msi) \
(MSI_INTEL_ADDR_BASE | (msi)->msi_cpu << 12 | \
MSI_INTEL_ADDR_RH_OFF | MSI_INTEL_ADDR_DM_PHYSICAL)
#define INTEL_DATA(msi) \
(MSI_INTEL_DATA_TRGREDG | MSI_INTEL_DATA_DELFIXED | (msi)->msi_vector)
static MALLOC_DEFINE(M_MSI, "msi", "PCI MSI");
/*
* MSI sources are bunched into groups. This is because MSI forces
* all of the messages to share the address and data registers and
* thus certain properties (such as the local APIC ID target on x86).
* Each group has a 'first' source that contains information global to
* the group. These fields are marked with (g) below.
*
* Note that local APIC ID is kind of special. Each message will be
* assigned an ID by the system; however, a group will use the ID from
* the first message.
*
* For MSI-X, each message is isolated.
*/
struct msi_intsrc {
struct intsrc msi_intsrc;
device_t msi_dev; /* Owning device. (g) */
struct msi_intsrc *msi_first; /* First source in group. */
u_int msi_irq; /* IRQ cookie. */
u_int msi_msix; /* MSI-X message. */
u_int msi_vector:8; /* IDT vector. */
u_int msi_cpu:8; /* Local APIC ID. (g) */
u_int msi_count:8; /* Messages in this group. (g) */
u_int msi_maxcount:8; /* Alignment for this group. (g) */
int *msi_irqs; /* Group's IRQ list. (g) */
};
static void msi_create_source(void);
static void msi_enable_source(struct intsrc *isrc);
static void msi_disable_source(struct intsrc *isrc, int eoi);
static void msi_eoi_source(struct intsrc *isrc);
static void msi_enable_intr(struct intsrc *isrc);
static void msi_disable_intr(struct intsrc *isrc);
static int msi_vector(struct intsrc *isrc);
static int msi_source_pending(struct intsrc *isrc);
static int msi_config_intr(struct intsrc *isrc, enum intr_trigger trig,
enum intr_polarity pol);
static int msi_assign_cpu(struct intsrc *isrc, u_int apic_id);
struct pic msi_pic = { msi_enable_source, msi_disable_source, msi_eoi_source,
msi_enable_intr, msi_disable_intr, msi_vector,
msi_source_pending, NULL, NULL, msi_config_intr,
msi_assign_cpu };
static int msi_enabled;
static int msi_last_irq;
static struct mtx msi_lock;
static void
msi_enable_source(struct intsrc *isrc)
{
}
static void
msi_disable_source(struct intsrc *isrc, int eoi)
{
if (eoi == PIC_EOI)
lapic_eoi();
}
static void
msi_eoi_source(struct intsrc *isrc)
{
lapic_eoi();
}
static void
msi_enable_intr(struct intsrc *isrc)
{
struct msi_intsrc *msi = (struct msi_intsrc *)isrc;
apic_enable_vector(msi->msi_cpu, msi->msi_vector);
}
static void
msi_disable_intr(struct intsrc *isrc)
{
struct msi_intsrc *msi = (struct msi_intsrc *)isrc;
apic_disable_vector(msi->msi_cpu, msi->msi_vector);
}
static int
msi_vector(struct intsrc *isrc)
{
struct msi_intsrc *msi = (struct msi_intsrc *)isrc;
return (msi->msi_irq);
}
static int
msi_source_pending(struct intsrc *isrc)
{
return (0);
}
static int
msi_config_intr(struct intsrc *isrc, enum intr_trigger trig,
enum intr_polarity pol)
{
return (ENODEV);
}
static int
msi_assign_cpu(struct intsrc *isrc, u_int apic_id)
{
struct msi_intsrc *sib, *msi = (struct msi_intsrc *)isrc;
int old_vector;
u_int old_id;
int i, vector;
/*
* Only allow CPUs to be assigned to the first message for an
* MSI group.
*/
if (msi->msi_first != msi)
return (EINVAL);
/* Store information to free existing irq. */
old_vector = msi->msi_vector;
old_id = msi->msi_cpu;
if (old_id == apic_id)
return (0);
/* Allocate IDT vectors on this cpu. */
if (msi->msi_count > 1) {
KASSERT(msi->msi_msix == 0, ("MSI-X message group"));
vector = apic_alloc_vectors(apic_id, msi->msi_irqs,
msi->msi_count, msi->msi_maxcount);
} else
vector = apic_alloc_vector(apic_id, msi->msi_irq);
if (vector == 0)
return (ENOSPC);
msi->msi_cpu = apic_id;
msi->msi_vector = vector;
if (msi->msi_intsrc.is_handlers > 0)
apic_enable_vector(msi->msi_cpu, msi->msi_vector);
if (bootverbose)
printf("msi: Assigning %s IRQ %d to local APIC %u vector %u\n",
msi->msi_msix ? "MSI-X" : "MSI", msi->msi_irq,
msi->msi_cpu, msi->msi_vector);
for (i = 1; i < msi->msi_count; i++) {
sib = (struct msi_intsrc *)intr_lookup_source(msi->msi_irqs[i]);
sib->msi_cpu = apic_id;
sib->msi_vector = vector + i;
if (sib->msi_intsrc.is_handlers > 0)
apic_enable_vector(sib->msi_cpu, sib->msi_vector);
if (bootverbose)
printf(
"msi: Assigning MSI IRQ %d to local APIC %u vector %u\n",
sib->msi_irq, sib->msi_cpu, sib->msi_vector);
}
BUS_REMAP_INTR(device_get_parent(msi->msi_dev), msi->msi_dev,
msi->msi_irq);
/*
* Free the old vector after the new one is established. This is done
* to prevent races where we could miss an interrupt.
*/
if (msi->msi_intsrc.is_handlers > 0)
apic_disable_vector(old_id, old_vector);
apic_free_vector(old_id, old_vector, msi->msi_irq);
for (i = 1; i < msi->msi_count; i++) {
sib = (struct msi_intsrc *)intr_lookup_source(msi->msi_irqs[i]);
if (sib->msi_intsrc.is_handlers > 0)
apic_disable_vector(old_id, old_vector + i);
apic_free_vector(old_id, old_vector + i, msi->msi_irqs[i]);
}
return (0);
}
void
msi_init(void)
{
/* Check if we have a supported CPU. */
switch (cpu_vendor_id) {
case CPU_VENDOR_INTEL:
case CPU_VENDOR_AMD:
break;
case CPU_VENDOR_CENTAUR:
if (CPUID_TO_FAMILY(cpu_id) == 0x6 &&
CPUID_TO_MODEL(cpu_id) >= 0xf)
break;
/* FALLTHROUGH */
default:
return;
}
msi_enabled = 1;
intr_register_pic(&msi_pic);
mtx_init(&msi_lock, "msi", NULL, MTX_DEF);
}
static void
msi_create_source(void)
{
struct msi_intsrc *msi;
u_int irq;
mtx_lock(&msi_lock);
if (msi_last_irq >= NUM_MSI_INTS) {
mtx_unlock(&msi_lock);
return;
}
irq = msi_last_irq + FIRST_MSI_INT;
msi_last_irq++;
mtx_unlock(&msi_lock);
msi = malloc(sizeof(struct msi_intsrc), M_MSI, M_WAITOK | M_ZERO);
msi->msi_intsrc.is_pic = &msi_pic;
msi->msi_irq = irq;
intr_register_source(&msi->msi_intsrc);
nexus_add_irq(irq);
}
/*
* Try to allocate 'count' interrupt sources with contiguous IDT values.
*/
int
msi_alloc(device_t dev, int count, int maxcount, int *irqs)
{
struct msi_intsrc *msi, *fsrc;
u_int cpu;
int cnt, i, *mirqs, vector;
if (!msi_enabled)
return (ENXIO);
if (count > 1)
mirqs = malloc(count * sizeof(*mirqs), M_MSI, M_WAITOK);
else
mirqs = NULL;
again:
mtx_lock(&msi_lock);
/* Try to find 'count' free IRQs. */
cnt = 0;
for (i = FIRST_MSI_INT; i < FIRST_MSI_INT + NUM_MSI_INTS; i++) {
msi = (struct msi_intsrc *)intr_lookup_source(i);
/* End of allocated sources, so break. */
if (msi == NULL)
break;
/* If this is a free one, save its IRQ in the array. */
if (msi->msi_dev == NULL) {
irqs[cnt] = i;
cnt++;
if (cnt == count)
break;
}
}
/* Do we need to create some new sources? */
if (cnt < count) {
/* If we would exceed the max, give up. */
if (i + (count - cnt) > FIRST_MSI_INT + NUM_MSI_INTS) {
mtx_unlock(&msi_lock);
free(mirqs, M_MSI);
return (ENXIO);
}
mtx_unlock(&msi_lock);
/* We need count - cnt more sources. */
while (cnt < count) {
msi_create_source();
cnt++;
}
goto again;
}
/* Ok, we now have the IRQs allocated. */
KASSERT(cnt == count, ("count mismatch"));
/* Allocate 'count' IDT vectors. */
cpu = intr_next_cpu();
vector = apic_alloc_vectors(cpu, irqs, count, maxcount);
if (vector == 0) {
mtx_unlock(&msi_lock);
free(mirqs, M_MSI);
return (ENOSPC);
}
/* Assign IDT vectors and make these messages owned by 'dev'. */
fsrc = (struct msi_intsrc *)intr_lookup_source(irqs[0]);
for (i = 0; i < count; i++) {
msi = (struct msi_intsrc *)intr_lookup_source(irqs[i]);
msi->msi_cpu = cpu;
msi->msi_dev = dev;
msi->msi_vector = vector + i;
if (bootverbose)
printf(
"msi: routing MSI IRQ %d to local APIC %u vector %u\n",
msi->msi_irq, msi->msi_cpu, msi->msi_vector);
msi->msi_first = fsrc;
KASSERT(msi->msi_intsrc.is_handlers == 0,
("dead MSI has handlers"));
}
fsrc->msi_count = count;
fsrc->msi_maxcount = maxcount;
if (count > 1)
bcopy(irqs, mirqs, count * sizeof(*mirqs));
fsrc->msi_irqs = mirqs;
mtx_unlock(&msi_lock);
return (0);
}
int
msi_release(int *irqs, int count)
{
struct msi_intsrc *msi, *first;
int i;
mtx_lock(&msi_lock);
first = (struct msi_intsrc *)intr_lookup_source(irqs[0]);
if (first == NULL) {
mtx_unlock(&msi_lock);
return (ENOENT);
}
/* Make sure this isn't an MSI-X message. */
if (first->msi_msix) {
mtx_unlock(&msi_lock);
return (EINVAL);
}
/* Make sure this message is allocated to a group. */
if (first->msi_first == NULL) {
mtx_unlock(&msi_lock);
return (ENXIO);
}
/*
* Make sure this is the start of a group and that we are releasing
* the entire group.
*/
if (first->msi_first != first || first->msi_count != count) {
mtx_unlock(&msi_lock);
return (EINVAL);
}
KASSERT(first->msi_dev != NULL, ("unowned group"));
/* Clear all the extra messages in the group. */
for (i = 1; i < count; i++) {
msi = (struct msi_intsrc *)intr_lookup_source(irqs[i]);
KASSERT(msi->msi_first == first, ("message not in group"));
KASSERT(msi->msi_dev == first->msi_dev, ("owner mismatch"));
msi->msi_first = NULL;
msi->msi_dev = NULL;
apic_free_vector(msi->msi_cpu, msi->msi_vector, msi->msi_irq);
msi->msi_vector = 0;
}
/* Clear out the first message. */
first->msi_first = NULL;
first->msi_dev = NULL;
apic_free_vector(first->msi_cpu, first->msi_vector, first->msi_irq);
first->msi_vector = 0;
first->msi_count = 0;
first->msi_maxcount = 0;
free(first->msi_irqs, M_MSI);
first->msi_irqs = NULL;
mtx_unlock(&msi_lock);
return (0);
}
int
msi_map(int irq, uint64_t *addr, uint32_t *data)
{
struct msi_intsrc *msi;
mtx_lock(&msi_lock);
msi = (struct msi_intsrc *)intr_lookup_source(irq);
if (msi == NULL) {
mtx_unlock(&msi_lock);
return (ENOENT);
}
/* Make sure this message is allocated to a device. */
if (msi->msi_dev == NULL) {
mtx_unlock(&msi_lock);
return (ENXIO);
}
/*
* If this message isn't an MSI-X message, make sure it's part
* of a group, and switch to the first message in the
* group.
*/
if (!msi->msi_msix) {
if (msi->msi_first == NULL) {
mtx_unlock(&msi_lock);
return (ENXIO);
}
msi = msi->msi_first;
}
*addr = INTEL_ADDR(msi);
*data = INTEL_DATA(msi);
mtx_unlock(&msi_lock);
return (0);
}
int
msix_alloc(device_t dev, int *irq)
{
struct msi_intsrc *msi;
u_int cpu;
int i, vector;
if (!msi_enabled)
return (ENXIO);
again:
mtx_lock(&msi_lock);
/* Find a free IRQ. */
for (i = FIRST_MSI_INT; i < FIRST_MSI_INT + NUM_MSI_INTS; i++) {
msi = (struct msi_intsrc *)intr_lookup_source(i);
/* End of allocated sources, so break. */
if (msi == NULL)
break;
/* Stop at the first free source. */
if (msi->msi_dev == NULL)
break;
}
/* Do we need to create a new source? */
if (msi == NULL) {
/* If we would exceed the max, give up. */
if (i + 1 > FIRST_MSI_INT + NUM_MSI_INTS) {
mtx_unlock(&msi_lock);
return (ENXIO);
}
mtx_unlock(&msi_lock);
/* Create a new source. */
msi_create_source();
goto again;
}
/* Allocate an IDT vector. */
cpu = intr_next_cpu();
vector = apic_alloc_vector(cpu, i);
if (vector == 0) {
mtx_unlock(&msi_lock);
return (ENOSPC);
}
if (bootverbose)
printf("msi: routing MSI-X IRQ %d to local APIC %u vector %u\n",
msi->msi_irq, cpu, vector);
/* Setup source. */
msi->msi_cpu = cpu;
msi->msi_dev = dev;
msi->msi_first = msi;
msi->msi_vector = vector;
msi->msi_msix = 1;
msi->msi_count = 1;
msi->msi_maxcount = 1;
msi->msi_irqs = NULL;
KASSERT(msi->msi_intsrc.is_handlers == 0, ("dead MSI-X has handlers"));
mtx_unlock(&msi_lock);
*irq = i;
return (0);
}
int
msix_release(int irq)
{
struct msi_intsrc *msi;
mtx_lock(&msi_lock);
msi = (struct msi_intsrc *)intr_lookup_source(irq);
if (msi == NULL) {
mtx_unlock(&msi_lock);
return (ENOENT);
}
/* Make sure this is an MSI-X message. */
if (!msi->msi_msix) {
mtx_unlock(&msi_lock);
return (EINVAL);
}
KASSERT(msi->msi_dev != NULL, ("unowned message"));
/* Clear out the message. */
msi->msi_first = NULL;
msi->msi_dev = NULL;
apic_free_vector(msi->msi_cpu, msi->msi_vector, msi->msi_irq);
msi->msi_vector = 0;
msi->msi_msix = 0;
msi->msi_count = 0;
msi->msi_maxcount = 0;
mtx_unlock(&msi_lock);
return (0);
}