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Commit f036d4ea authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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[PATCH] ia32 Message Signalled Interrupt support 

From: long <tlnguyen@snoqualmie.dp.intel.com>


Add support for Message Signalled Interrupt delivery on ia32.

With a fix from Zwane Mwaikambo <zwane@arm.linux.org.uk>
parent 82b699a6
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Documentation/MSI-HOWTO.txt 0 → 100644
View file @ f036d4ea
The MSI Driver Guide HOWTO
Tom L Nguyen tom.l.nguyen@intel.com
10/03/2003
1. About this guide
This guide describes the basics of Message Signaled Interrupts(MSI), the
advantages of using MSI over traditional interrupt mechanisms, and how
to enable your driver to use MSI or MSI-X. Also included is a Frequently
Asked Questions.
2. Copyright 2003 Intel Corporation
3. What is MSI/MSI-X?
Message Signaled Interrupt (MSI), as described in the PCI Local Bus
Specification Revision 2.3 or latest, is an optional feature, and a
required feature for PCI Express devices. MSI enables a device function
to request service by sending an Inbound Memory Write on its PCI bus to
the FSB as a Message Signal Interrupt transaction. Because MSI is
generated in the form of a Memory Write, all transaction conditions,
such as a Retry, Master-Abort, Target-Abort or normal completion, are
supported.
A PCI device that supports MSI must also support pin IRQ assertion
interrupt mechanism to provide backward compatibility for systems that
do not support MSI. In Systems, which support MSI, the bus driver is
responsible for initializing the message address and message data of
the device function's MSI/MSI-X capability structure during device
initial configuration.
An MSI capable device function indicates MSI support by implementing
the MSI/MSI-X capability structure in its PCI capability list. The
device function may implement both the MSI capability structure and
the MSI-X capability structure; however, the bus driver should not
enable both, but instead enable only the MSI-X capability structure.
The MSI capability structure contains Message Control register,
Message Address register and Message Data register. These registers
provide the bus driver control over MSI. The Message Control register
indicates the MSI capability supported by the device. The Message
Address register specifies the target address and the Message Data
register specifies the characteristics of the message. To request
service, the device function writes the content of the Message Data
register to the target address. The device and its software driver
are prohibited from writing to these registers.
The MSI-X capability structure is an optional extension to MSI. It
uses an independent and separate capability structure. There are
some key advantages to implementing the MSI-X capability structure
over the MSI capability structure as described below.
- Support a larger maximum number of vectors per function.
- Provide the ability for system software to configure
each vector with an independent message address and message
data, specified by a table that resides in Memory Space.
- MSI and MSI-X both support per-vector masking. Per-vector
masking is an optional extension of MSI but a required
feature for MSI-X. Per-vector masking provides the kernel
the ability to mask/unmask MSI when servicing its software
interrupt service routing handler. If per-vector masking is
not supported, then the device driver should provide the
hardware/software synchronization to ensure that the device
generates MSI when the driver wants it to do so.
4. Why use MSI?
As a benefit the simplification of board design, MSI allows board
designers to remove out of band interrupt routing. MSI is another
step towards a legacy-free environment.
Due to increasing pressure on chipset and processor packages to
reduce pin count, the need for interrupt pins is expected to
diminish over time. Devices, due to pin constraints, may implement
messages to increase performance.
PCI Express endpoints uses INTx emulation (in-band messages) instead
of IRQ pin assertion. Using INTx emulation requires interrupt
sharing among devices connected to the same node (PCI bridge) while
MSI is unique (non-shared) and does not require BIOS configuration
support. As a result, the PCI Express technology requires MSI
support for better interrupt performance.
Using MSI enables the device functions to support two or more
vectors, which can be configure to target different CPU's to
increase scalability.
5. Configuring a driver to use MSI/MSI-X
By default, the kernel will not enable MSI/MSI-X on all devices that
support this capability once the patch is installed. A kernel
configuration option must be selected to enable MSI/MSI-X support.
5.1 Including MSI support into the kernel
To include MSI support into the kernel requires users to patch the
VECTOR-base patch first and then the MSI patch because the MSI
support needs VECTOR based scheme. Once these patches are installed,
setting CONFIG_PCI_USE_VECTOR enables the VECTOR based scheme and
the option for MSI-capable device drivers to selectively enable MSI
(using pci_enable_msi as desribed below).
Since the target of the inbound message is the local APIC, providing
CONFIG_PCI_USE_VECTOR is dependent on whether CONFIG_X86_LOCAL_APIC
is enabled or not.
int pci_enable_msi(struct pci_dev *)
With this new API, any existing device driver, which like to have
MSI enabled on its device function, must call this explicitly. A
successful call will initialize the MSI/MSI-X capability structure
with ONE vector, regardless of whether the device function is
capable of supporting multiple messages. This vector replaces the
pre-assigned dev->irq with a new MSI vector. To avoid the conflict
of new assigned vector with existing pre-assigned vector requires
the device driver to call this API before calling request_irq(...).
The below diagram shows the events, which switches the interrupt
mode on the MSI-capable device function between MSI mode and
PIN-IRQ assertion mode.
------------ pci_enable_msi ------------------------
| | <=============== | |
| MSI MODE | | PIN-IRQ ASSERTION MODE |
| | ===============> | |
------------ free_irq ------------------------
5.2 Configuring for MSI support
Due to the non-contiguous fashion in vector assignment of the
existing Linux kernel, this patch does not support multiple
messages regardless of the device function is capable of supporting
more than one vector. The bus driver initializes only entry 0 of
this capability if pci_enable_msi(...) is called successfully by
the device driver.
5.3 Configuring for MSI-X support
Both the MSI capability structure and the MSI-X capability structure
share the same above semantics; however, due to the ability of the
system software to configure each vector of the MSI-X capability
structure with an independent message address and message data, the
non-contiguous fashion in vector assignment of the existing Linux
kernel has no impact on supporting multiple messages on an MSI-X
capable device functions. By default, as mentioned above, ONE vector
should be always allocated to the MSI-X capability structure at
entry 0. The bus driver does not initialize other entries of the
MSI-X table.
Note that the PCI subsystem should have full control of a MSI-X
table that resides in Memory Space. The software device driver
should not access this table.
To request for additional vectors, the device software driver should
call function msi_alloc_vectors(). It is recommended that the
software driver should call this function once during the
initialization phase of the device driver.
The function msi_alloc_vectors(), once invoked, enables either
all or nothing, depending on the current availability of vector
resources. If no vector resources are available, the device function
still works with ONE vector. If the vector resources are available
for the number of vectors requested by the driver, this function
will reconfigure the MSI-X capability structure of the device with
additional messages, starting from entry 1. To emphasize this
reason, for example, the device may be capable for supporting the
maximum of 32 vectors while its software driver usually may request
4 vectors.
For each vector, after this successful call, the device driver is
responsible to call other functions like request_irq(), enable_irq(),
etc. to enable this vector with its corresponding interrupt service
handler. It is the device driver's choice to have all vectors shared
the same interrupt service handler or each vector with a unique
interrupt service handler.
In addition to the function msi_alloc_vectors(), another function
msi_free_vectors() is provided to allow the software driver to
release a number of vectors back to the vector resources. Once
invoked, the PCI subsystem disables (masks) each vector released.
These vectors are no longer valid for the hardware device and its
software driver to use. Like free_irq, it recommends that the
device driver should also call msi_free_vectors to release all
additional vectors previously requested.
int msi_alloc_vectors(struct pci_dev *dev, int *vector, int nvec)
This API enables the software driver to request the PCI subsystem
for additional messages. Depending on the number of vectors
available, the PCI subsystem enables either all or nothing.
Argument dev points to the device (pci_dev) structure.
Argument vector is a pointer of integer type. The number of
elements is indicated in argument nvec.
Argument nvec is an integer indicating the number of messages
requested.
A return of zero indicates that the number of allocated vector is
successfully allocated. Otherwise, indicate resources not
available.
int msi_free_vectors(struct pci_dev* dev, int *vector, int nvec)
This API enables the software driver to inform the PCI subsystem
that it is willing to release a number of vectors back to the
MSI resource pool. Once invoked, the PCI subsystem disables each
MSI-X entry associated with each vector stored in the argument 2.
These vectors are no longer valid for the hardware device and
its software driver to use.
Argument dev points to the device (pci_dev) structure.
Argument vector is a pointer of integer type. The number of
elements is indicated in argument nvec.
Argument nvec is an integer indicating the number of messages
released.
A return of zero indicates that the number of allocated vectors
is successfully released. Otherwise, indicates a failure.
5.4 Hardware requirements for MSI support
MSI support requires support from both system hardware and
individual hardware device functions.
5.4.1 System hardware support
Since the target of MSI address is the local APIC CPU, enabling
MSI support in Linux kernel is dependent on whether existing
system hardware supports local APIC. Users should verify their
system whether it runs when CONFIG_X86_LOCAL_APIC=y.
In SMP environment, CONFIG_X86_LOCAL_APIC is automatically set;
however, in UP environment, users must manually set
CONFIG_X86_LOCAL_APIC. Once CONFIG_X86_LOCAL_APIC=y, setting
CONFIG_PCI_USE_VECTOR enables the VECTOR based scheme and
the option for MSI-capable device drivers to selectively enable
MSI (using pci_enable_msi as desribed below).
Note that CONFIG_X86_IO_APIC setting is irrelevant because MSI
vector is allocated new during runtime and MSI support does not
depend on BIOS support. This key independency enables MSI support
on future IOxAPIC free platform.
5.4.2 Device hardware support
The hardware device function supports MSI by indicating the
MSI/MSI-X capability structure on its PCI capability list. By
default, this capability structure will not be initialized by
the kernel to enable MSI during the system boot. In other words,
the device function is running on its default pin assertion mode.
Note that in many cases the hardware supporting MSI have bugs,
which may result in system hang. The software driver of specific
MSI-capable hardware is responsible for whether calling
pci_enable_msi or not. A return of zero indicates the kernel
successfully initializes the MSI/MSI-X capability structure of the
device funtion. The device function is now running on MSI mode.
5.5 How to tell whether MSI is enabled on device function
At the driver level, a return of zero from pci_enable_msi(...)
indicates to the device driver that its device function is
initialized successfully and ready to run in MSI mode.
At the user level, users can use command 'cat /proc/interrupts'
to display the vector allocated for the device and its interrupt
mode, as shown below.
CPU0 CPU1
0: 324639 0 IO-APIC-edge timer
1: 1186 0 IO-APIC-edge i8042
2: 0 0 XT-PIC cascade
12: 2797 0 IO-APIC-edge i8042
14: 6543 0 IO-APIC-edge ide0
15: 1 0 IO-APIC-edge ide1
169: 0 0 IO-APIC-level uhci-hcd
185: 0 0 IO-APIC-level uhci-hcd
193: 138 10 PCI MSI aic79xx
201: 30 0 PCI MSI aic79xx
225: 30 0 IO-APIC-level aic7xxx
233: 30 0 IO-APIC-level aic7xxx
NMI: 0 0
LOC: 324553 325068
ERR: 0
MIS: 0
6. FAQ
Q1. Are there any limitations on using the MSI?
A1. If the PCI device supports MSI and conforms to the
specification and the platform supports the APIC local bus,
then using MSI should work.
Q2. Will it work on all the Pentium processors (P3, P4, Xeon,
AMD processors)? In P3 IPI's are transmitted on the APIC local
bus and in P4 and Xeon they are transmitted on the system
bus. Are there any implications with this?
A2. MSI support enables a PCI device sending an inbound
memory write (0xfeexxxxx as target address) on its PCI bus
directly to the FSB. Since the message address has a
redirection hint bit cleared, it should work.
Q3. The target address 0xfeexxxxx will be translated by the
Host Bridge into an interrupt message. Are there any
limitations on the chipsets such as Intel 8xx, Intel e7xxx,
or VIA?
A3. If these chipsets support an inbound memory write with
target address set as 0xfeexxxxx, as conformed to PCI
specification 2.3 or latest, then it should work.
Q4. From the driver point of view, if the MSI is lost because
of the errors occur during inbound memory write, then it may
wait for ever. Is there a mechanism for it to recover?
A4. Since the target of the transaction is an inbound memory
write, all transaction termination conditions (Retry,
Master-Abort, Target-Abort, or normal completion) are
supported. A device sending an MSI must abide by all the PCI
rules and conditions regarding that inbound memory write. So,
if a retry is signaled it must retry, etc... We believe that
the recommendation for Abort is also a retry (refer to PCI
specification 2.3 or latest).
arch/i386/Kconfig
View file @ f036d4ea
......@@ -1030,6 +1030,25 @@ config PCI_DIRECT
depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
default y
config PCI_USE_VECTOR
bool "Vector-based interrupt indexing"
depends on X86_LOCAL_APIC
default n
help
This replaces the current existing IRQ-based index interrupt scheme
with the vector-base index scheme. The advantages of vector base
over IRQ base are listed below:
1) Support MSI implementation.
2) Support future IOxAPIC hotplug
Note that this enables MSI, Message Signaled Interrupt, on all
MSI capable device functions detected if users also install the
MSI patch. Message Signal Interrupt enables an MSI-capable
hardware device to send an inbound Memory Write on its PCI bus
instead of asserting IRQ signal on device IRQ pin.
If you don't know what to do here, say N.
source "drivers/pci/Kconfig"
config ISA
......
arch/i386/kernel/i8259.c
View file @ f036d4ea
......@@ -419,8 +419,10 @@ void __init init_IRQ(void)
* us. (some of these will be overridden and become
* 'special' SMP interrupts)
*/
for (i = 0; i < NR_IRQS; i++) {
for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
int vector = FIRST_EXTERNAL_VECTOR + i;
if (i >= NR_IRQS)
break;
if (vector != SYSCALL_VECTOR)
set_intr_gate(vector, interrupt[i]);
}
......
arch/i386/kernel/io_apic.c
View file @ f036d4ea
......@@ -76,6 +76,14 @@ static struct irq_pin_list {
int apic, pin, next;
} irq_2_pin[PIN_MAP_SIZE];
#ifdef CONFIG_PCI_USE_VECTOR
int vector_irq[NR_IRQS] = { [0 ... NR_IRQS -1] = -1};
#define vector_to_irq(vector) \
(platform_legacy_irq(vector) ? vector : vector_irq[vector])
#else
#define vector_to_irq(vector) (vector)
#endif
/*
* The common case is 1:1 IRQ<->pin mappings. Sometimes there are
* shared ISA-space IRQs, so we have to support them. We are super
......@@ -249,7 +257,7 @@ static void clear_IO_APIC (void)
clear_IO_APIC_pin(apic, pin);
}
static void set_ioapic_affinity(unsigned int irq, cpumask_t cpumask)
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
{
unsigned long flags;
int pin;
......@@ -288,7 +296,7 @@ static void set_ioapic_affinity(unsigned int irq, cpumask_t cpumask)
extern cpumask_t irq_affinity[NR_IRQS];
static cpumask_t __cacheline_aligned pending_irq_balance_cpumask[NR_IRQS];
cpumask_t __cacheline_aligned pending_irq_balance_cpumask[NR_IRQS];
#define IRQBALANCE_CHECK_ARCH -999
static int irqbalance_disabled = IRQBALANCE_CHECK_ARCH;
......@@ -670,13 +678,11 @@ static int __init irqbalance_disable(char *str)
__setup("noirqbalance", irqbalance_disable);
static void set_ioapic_affinity(unsigned int irq, cpumask_t mask);
static inline void move_irq(int irq)
{
/* note - we hold the desc->lock */
if (unlikely(!cpus_empty(pending_irq_balance_cpumask[irq]))) {
set_ioapic_affinity(irq, pending_irq_balance_cpumask[irq]);
set_ioapic_affinity_irq(irq, pending_irq_balance_cpumask[irq]);
cpus_clear(pending_irq_balance_cpumask[irq]);
}
}
......@@ -853,7 +859,7 @@ void __init setup_ioapic_dest(cpumask_t mask)
if (irq_entry == -1)
continue;
irq = pin_2_irq(irq_entry, ioapic, pin);
set_ioapic_affinity(irq, mask);
set_ioapic_affinity_irq(irq, mask);
}
}
......@@ -1141,7 +1147,8 @@ static inline int IO_APIC_irq_trigger(int irq)
/* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
u8 irq_vector[NR_IRQ_VECTORS] = { FIRST_DEVICE_VECTOR , 0 };
static int __init assign_irq_vector(int irq)
#ifndef CONFIG_PCI_USE_VECTOR
int __init assign_irq_vector(int irq)
{
static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
BUG_ON(irq >= NR_IRQ_VECTORS);
......@@ -1158,11 +1165,36 @@ static int __init assign_irq_vector(int irq)
}
IO_APIC_VECTOR(irq) = current_vector;
return current_vector;
}
#endif
static struct hw_interrupt_type ioapic_level_type;
static struct hw_interrupt_type ioapic_edge_type;
static struct hw_interrupt_type ioapic_level_irq_type;
static struct hw_interrupt_type ioapic_edge_irq_type;
#define IOAPIC_AUTO -1
#define IOAPIC_EDGE 0
#define IOAPIC_LEVEL 1
static inline void ioapic_register_intr(int irq, int vector, unsigned long trigger)
{
if (use_pci_vector() && !platform_legacy_irq(irq)) {
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
trigger == IOAPIC_LEVEL)
irq_desc[vector].handler = &ioapic_level_type;
else
irq_desc[vector].handler = &ioapic_edge_type;
set_intr_gate(vector, interrupt[vector]);
} else {
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
trigger == IOAPIC_LEVEL)
irq_desc[irq].handler = &ioapic_level_type;
else
irq_desc[irq].handler = &ioapic_edge_type;
set_intr_gate(vector, interrupt[irq]);
}
}
void __init setup_IO_APIC_irqs(void)
{
......@@ -1220,13 +1252,7 @@ void __init setup_IO_APIC_irqs(void)
if (IO_APIC_IRQ(irq)) {
vector = assign_irq_vector(irq);
entry.vector = vector;
if (IO_APIC_irq_trigger(irq))
irq_desc[irq].handler = &ioapic_level_irq_type;
else
irq_desc[irq].handler = &ioapic_edge_irq_type;
set_intr_gate(vector, interrupt[irq]);
ioapic_register_intr(irq, vector, IOAPIC_AUTO);
if (!apic && (irq < 16))
disable_8259A_irq(irq);
......@@ -1273,7 +1299,7 @@ void __init setup_ExtINT_IRQ0_pin(unsigned int pin, int vector)
* The timer IRQ doesn't have to know that behind the
* scene we have a 8259A-master in AEOI mode ...
*/
irq_desc[0].handler = &ioapic_edge_irq_type;
irq_desc[0].handler = &ioapic_edge_type;
/*
* Add it to the IO-APIC irq-routing table:
......@@ -1763,9 +1789,6 @@ static int __init timer_irq_works(void)
* that was delayed but this is now handled in the device
* independent code.
*/
#define enable_edge_ioapic_irq unmask_IO_APIC_irq
static void disable_edge_ioapic_irq (unsigned int irq) { /* nothing */ }
/*
* Starting up a edge-triggered IO-APIC interrupt is
......@@ -1776,7 +1799,6 @@ static void disable_edge_ioapic_irq (unsigned int irq) { /* nothing */ }
* This is not complete - we should be able to fake
* an edge even if it isn't on the 8259A...
*/
static unsigned int startup_edge_ioapic_irq(unsigned int irq)
{
int was_pending = 0;
......@@ -1794,8 +1816,6 @@ static unsigned int startup_edge_ioapic_irq(unsigned int irq)
return was_pending;
}
#define shutdown_edge_ioapic_irq disable_edge_ioapic_irq
/*
* Once we have recorded IRQ_PENDING already, we can mask the
* interrupt for real. This prevents IRQ storms from unhandled
......@@ -1810,9 +1830,6 @@ static void ack_edge_ioapic_irq(unsigned int irq)
ack_APIC_irq();
}
static void end_edge_ioapic_irq (unsigned int i) { /* nothing */ }
/*
* Level triggered interrupts can just be masked,
* and shutting down and starting up the interrupt
......@@ -1834,10 +1851,6 @@ static unsigned int startup_level_ioapic_irq (unsigned int irq)
return 0; /* don't check for pending */
}
#define shutdown_level_ioapic_irq mask_IO_APIC_irq
#define enable_level_ioapic_irq unmask_IO_APIC_irq
#define disable_level_ioapic_irq mask_IO_APIC_irq
static void end_level_ioapic_irq (unsigned int irq)
{
unsigned long v;
......@@ -1864,6 +1877,7 @@ static void end_level_ioapic_irq (unsigned int irq)
* The idea is from Manfred Spraul. --macro
*/
i = IO_APIC_VECTOR(irq);
v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
ack_APIC_irq();
......@@ -1898,7 +1912,57 @@ static void end_level_ioapic_irq (unsigned int irq)
}
}
static void mask_and_ack_level_ioapic_irq (unsigned int irq) { /* nothing */ }
#ifdef CONFIG_PCI_USE_VECTOR
static unsigned int startup_edge_ioapic_vector(unsigned int vector)
{
int irq = vector_to_irq(vector);
return startup_edge_ioapic_irq(irq);
}
static void ack_edge_ioapic_vector(unsigned int vector)
{
int irq = vector_to_irq(vector);
ack_edge_ioapic_irq(irq);
}
static unsigned int startup_level_ioapic_vector (unsigned int vector)
{
int irq = vector_to_irq(vector);
return startup_level_ioapic_irq (irq);
}
static void end_level_ioapic_vector (unsigned int vector)
{
int irq = vector_to_irq(vector);
end_level_ioapic_irq(irq);
}
static void mask_IO_APIC_vector (unsigned int vector)
{
int irq = vector_to_irq(vector);
mask_IO_APIC_irq(irq);
}
static void unmask_IO_APIC_vector (unsigned int vector)
{
int irq = vector_to_irq(vector);
unmask_IO_APIC_irq(irq);
}
static void set_ioapic_affinity_vector (unsigned int vector,
cpumask_t cpu_mask)
{
int irq = vector_to_irq(vector);
set_ioapic_affinity_irq(irq, cpu_mask);
}
#endif
/*
* Level and edge triggered IO-APIC interrupts need different handling,
......@@ -1908,26 +1972,25 @@ static void mask_and_ack_level_ioapic_irq (unsigned int irq) { /* nothing */ }
* edge-triggered handler, without risking IRQ storms and other ugly
* races.
*/
static struct hw_interrupt_type ioapic_edge_irq_type = {
static struct hw_interrupt_type ioapic_edge_type = {
.typename = "IO-APIC-edge",
.startup = startup_edge_ioapic_irq,
.shutdown = shutdown_edge_ioapic_irq,
.enable = enable_edge_ioapic_irq,
.disable = disable_edge_ioapic_irq,
.ack = ack_edge_ioapic_irq,
.end = end_edge_ioapic_irq,
.startup = startup_edge_ioapic,
.shutdown = shutdown_edge_ioapic,
.enable = enable_edge_ioapic,
.disable = disable_edge_ioapic,
.ack = ack_edge_ioapic,
.end = end_edge_ioapic,
.set_affinity = set_ioapic_affinity,
};
static struct hw_interrupt_type ioapic_level_irq_type = {
static struct hw_interrupt_type ioapic_level_type = {
.typename = "IO-APIC-level",
.startup = startup_level_ioapic_irq,
.shutdown = shutdown_level_ioapic_irq,
.enable = enable_level_ioapic_irq,
.disable = disable_level_ioapic_irq,
.ack = mask_and_ack_level_ioapic_irq,
.end = end_level_ioapic_irq,
.startup = startup_level_ioapic,
.shutdown = shutdown_level_ioapic,
.enable = enable_level_ioapic,
.disable = disable_level_ioapic,
.ack = mask_and_ack_level_ioapic,
.end = end_level_ioapic,
.set_affinity = set_ioapic_affinity,
};
......@@ -1947,7 +2010,13 @@ static inline void init_IO_APIC_traps(void)
* 0x80, because int 0x80 is hm, kind of importantish. ;)
*/
for (irq = 0; irq < NR_IRQS ; irq++) {
if (IO_APIC_IRQ(irq) && !IO_APIC_VECTOR(irq)) {
int tmp = irq;
if (use_pci_vector()) {
if (!platform_legacy_irq(tmp))
if ((tmp = vector_to_irq(tmp)) == -1)
continue;
}
if (IO_APIC_IRQ(tmp) && !IO_APIC_VECTOR(tmp)) {
/*
* Hmm.. We don't have an entry for this,
* so default to an old-fashioned 8259
......@@ -2379,10 +2448,12 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
"IRQ %d Mode:%i Active:%i)\n", ioapic,
mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq, edge_level, active_high_low);
if (use_pci_vector() && !platform_legacy_irq(irq))
irq = IO_APIC_VECTOR(irq);
if (edge_level) {
irq_desc[irq].handler = &ioapic_level_irq_type;
irq_desc[irq].handler = &ioapic_level_type;
} else {
irq_desc[irq].handler = &ioapic_edge_irq_type;
irq_desc[irq].handler = &ioapic_edge_type;
}
set_intr_gate(entry.vector, interrupt[irq]);
......
arch/i386/kernel/mpparse.c
View file @ f036d4ea
......@@ -1147,15 +1147,19 @@ void __init mp_parse_prt (void)
if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
printk(KERN_DEBUG "Pin %d-%d already programmed\n",
mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
entry->irq = irq;
if (use_pci_vector() && !platform_legacy_irq(irq))
irq = IO_APIC_VECTOR(irq);
entry->irq = irq;
continue;
}
mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
if (!io_apic_set_pci_routing(ioapic, ioapic_pin, irq, edge_level, active_high_low))
entry->irq = irq;
if (!io_apic_set_pci_routing(ioapic, ioapic_pin, irq, edge_level, active_high_low)) {
if (use_pci_vector() && !platform_legacy_irq(irq))
irq = IO_APIC_VECTOR(irq);
entry->irq = irq;
}
printk(KERN_DEBUG "%02x:%02x:%02x[%c] -> %d-%d -> IRQ %d\n",
entry->id.segment, entry->id.bus,
entry->id.device, ('A' + entry->pin),
......
arch/i386/pci/irq.c
View file @ f036d4ea
......@@ -805,8 +805,10 @@ static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
if ( dev2->irq && dev2->irq != irq && \
(!(pci_probe & PCI_USE_PIRQ_MASK) || \
((1 << dev2->irq) & mask)) ) {
#ifndef CONFIG_PCI_USE_VECTOR
printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %d\n",
pci_name(dev2), dev2->irq, irq);
#endif
continue;
}
dev2->irq = irq;
......@@ -870,6 +872,10 @@ static void __init pcibios_fixup_irqs(void)
bridge->bus->number, PCI_SLOT(bridge->devfn), pin, irq);
}
if (irq >= 0) {
if (use_pci_vector() &&
!platform_legacy_irq(irq))
irq = IO_APIC_VECTOR(irq);
printk(KERN_INFO "PCI->APIC IRQ transform: (B%d,I%d,P%d) -> %d\n",
dev->bus->number, PCI_SLOT(dev->devfn), pin, irq);
dev->irq = irq;
......
drivers/acpi/pci_irq.c
View file @ f036d4ea
......@@ -237,7 +237,7 @@ acpi_pci_irq_add_prt (
PCI Interrupt Routing Support
-------------------------------------------------------------------------- */
static int
int
acpi_pci_irq_lookup (struct pci_bus *bus, int device, int pin)
{
struct acpi_prt_entry *entry = NULL;
......
drivers/pci/Makefile
View file @ f036d4ea
......@@ -27,6 +27,7 @@ obj-$(CONFIG_PPC64) += setup-bus.o
obj-$(CONFIG_SGI_IP27) += setup-irq.o
obj-$(CONFIG_SGI_IP32) += setup-irq.o
obj-$(CONFIG_X86_VISWS) += setup-irq.o
obj-$(CONFIG_PCI_USE_VECTOR) += msi.o
# Cardbus & CompactPCI use setup-bus
obj-$(CONFIG_HOTPLUG) += setup-bus.o
......
drivers/pci/msi.c 0 → 100644
View file @ f036d4ea
/*
* linux/drivers/pci/msi.c
*/
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/config.h>
#include <linux/ioport.h>
#include <linux/smp_lock.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/desc.h>
#include <asm/io_apic.h>
#include <mach_apic.h>
#include <linux/pci_msi.h>
_DEFINE_DBG_BUFFER
static spinlock_t msi_lock = SPIN_LOCK_UNLOCKED;
static struct msi_desc* msi_desc[NR_IRQS] = { [0 ... NR_IRQS-1] = NULL };
static kmem_cache_t* msi_cachep;
static int pci_msi_enable = 1;
static int nr_alloc_vectors = 0;
static int nr_released_vectors = 0;
static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS;
static int nr_msix_devices = 0;
#ifndef CONFIG_X86_IO_APIC
int vector_irq[NR_IRQS] = { [0 ... NR_IRQS -1] = -1};
u8 irq_vector[NR_IRQS] = { FIRST_DEVICE_VECTOR , 0 };
#endif
static void msi_cache_ctor(void *p, kmem_cache_t *cache, unsigned long flags)
{
memset(p, 0, NR_IRQS * sizeof(struct msi_desc));
}
static int msi_cache_init(void)
{
msi_cachep = kmem_cache_create("msi_cache",
NR_IRQS * sizeof(struct msi_desc),
0, SLAB_HWCACHE_ALIGN, msi_cache_ctor, NULL);
if (!msi_cachep)
return -ENOMEM;
return 0;
}
static void msi_set_mask_bit(unsigned int vector, int flag)
{
struct msi_desc *entry;
entry = (struct msi_desc *)msi_desc[vector];
if (!entry || !entry->dev || !entry->mask_base)
return;
switch (entry->msi_attrib.type) {
case PCI_CAP_ID_MSI:
{
int pos;
unsigned int mask_bits;
pos = entry->mask_base;
entry->dev->bus->ops->read(entry->dev->bus, entry->dev->devfn,
pos, 4, &mask_bits);
mask_bits &= ~(1);
mask_bits |= flag;
entry->dev->bus->ops->write(entry->dev->bus, entry->dev->devfn,
pos, 4, mask_bits);
break;
}
case PCI_CAP_ID_MSIX:
{
int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET;
writel(flag, entry->mask_base + offset);
break;
}
default:
break;
}
}
#ifdef CONFIG_SMP
static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask)
{
struct msi_desc *entry;
struct msg_address address;
unsigned int dest_id;
entry = (struct msi_desc *)msi_desc[vector];
if (!entry || !entry->dev)
return;
switch (entry->msi_attrib.type) {
case PCI_CAP_ID_MSI:
{
int pos;
if (!(pos = pci_find_capability(entry->dev, PCI_CAP_ID_MSI)))
return;
entry->dev->bus->ops->read(entry->dev->bus, entry->dev->devfn,
msi_lower_address_reg(pos), 4,
&address.lo_address.value);
dest_id = (address.lo_address.u.dest_id &
MSI_ADDRESS_HEADER_MASK) |
(cpu_mask_to_apicid(cpu_mask) << MSI_TARGET_CPU_SHIFT);
address.lo_address.u.dest_id = dest_id;
entry->msi_attrib.current_cpu = cpu_mask_to_apicid(cpu_mask);
entry->dev->bus->ops->write(entry->dev->bus, entry->dev->devfn,
msi_lower_address_reg(pos), 4,
address.lo_address.value);
break;
}
case PCI_CAP_ID_MSIX:
{
int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET;
address.lo_address.value = readl(entry->mask_base + offset);
dest_id = (address.lo_address.u.dest_id &
MSI_ADDRESS_HEADER_MASK) |
(cpu_mask_to_apicid(cpu_mask) << MSI_TARGET_CPU_SHIFT);
address.lo_address.u.dest_id = dest_id;
entry->msi_attrib.current_cpu = cpu_mask_to_apicid(cpu_mask);
writel(address.lo_address.value, entry->mask_base + offset);
break;
}
default:
break;
}
}
static inline void move_msi(int vector)
{
if (!cpus_empty(pending_irq_balance_cpumask[vector])) {
set_msi_affinity(vector, pending_irq_balance_cpumask[vector]);
cpus_clear(pending_irq_balance_cpumask[vector]);
}
}
#endif
static void mask_MSI_irq(unsigned int vector)
{
msi_set_mask_bit(vector, 1);
}
static void unmask_MSI_irq(unsigned int vector)
{
msi_set_mask_bit(vector, 0);
}
static unsigned int startup_msi_irq_wo_maskbit(unsigned int vector)
{
return 0; /* never anything pending */
}
static void pci_disable_msi(unsigned int vector);
static void shutdown_msi_irq(unsigned int vector)
{
pci_disable_msi(vector);
}
#define shutdown_msi_irq_wo_maskbit shutdown_msi_irq
static void enable_msi_irq_wo_maskbit(unsigned int vector) {}
static void disable_msi_irq_wo_maskbit(unsigned int vector) {}
static void ack_msi_irq_wo_maskbit(unsigned int vector) {}
static void end_msi_irq_wo_maskbit(unsigned int vector)
{
move_msi(vector);
ack_APIC_irq();
}
static unsigned int startup_msi_irq_w_maskbit(unsigned int vector)
{
unmask_MSI_irq(vector);
return 0; /* never anything pending */
}
#define shutdown_msi_irq_w_maskbit shutdown_msi_irq
#define enable_msi_irq_w_maskbit unmask_MSI_irq
#define disable_msi_irq_w_maskbit mask_MSI_irq
#define ack_msi_irq_w_maskbit mask_MSI_irq
static void end_msi_irq_w_maskbit(unsigned int vector)
{
move_msi(vector);
unmask_MSI_irq(vector);
ack_APIC_irq();
}
/*
* Interrupt Type for MSI-X PCI/PCI-X/PCI-Express Devices,
* which implement the MSI-X Capability Structure.
*/
static struct hw_interrupt_type msix_irq_type = {
.typename = "PCI MSI-X",
.startup = startup_msi_irq_w_maskbit,
.shutdown = shutdown_msi_irq_w_maskbit,
.enable = enable_msi_irq_w_maskbit,
.disable = disable_msi_irq_w_maskbit,
.ack = ack_msi_irq_w_maskbit,
.end = end_msi_irq_w_maskbit,
.set_affinity = set_msi_irq_affinity
};
/*
* Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices,
* which implement the MSI Capability Structure with
* Mask-and-Pending Bits.
*/
static struct hw_interrupt_type msi_irq_w_maskbit_type = {
.typename = "PCI MSI",
.startup = startup_msi_irq_w_maskbit,
.shutdown = shutdown_msi_irq_w_maskbit,
.enable = enable_msi_irq_w_maskbit,
.disable = disable_msi_irq_w_maskbit,
.ack = ack_msi_irq_w_maskbit,
.end = end_msi_irq_w_maskbit,
.set_affinity = set_msi_irq_affinity
};
/*
* Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices,
* which implement the MSI Capability Structure without
* Mask-and-Pending Bits.
*/
static struct hw_interrupt_type msi_irq_wo_maskbit_type = {
.typename = "PCI MSI",
.startup = startup_msi_irq_wo_maskbit,
.shutdown = shutdown_msi_irq_wo_maskbit,
.enable = enable_msi_irq_wo_maskbit,
.disable = disable_msi_irq_wo_maskbit,
.ack = ack_msi_irq_wo_maskbit,
.end = end_msi_irq_wo_maskbit,
.set_affinity = set_msi_irq_affinity
};
static void msi_data_init(struct msg_data *msi_data,
unsigned int vector)
{
memset(msi_data, 0, sizeof(struct msg_data));
msi_data->vector = (u8)vector;
msi_data->delivery_mode = MSI_DELIVERY_MODE;
msi_data->level = MSI_LEVEL_MODE;
msi_data->trigger = MSI_TRIGGER_MODE;
}
static void msi_address_init(struct msg_address *msi_address)
{
unsigned int dest_id;
memset(msi_address, 0, sizeof(struct msg_address));
msi_address->hi_address = (u32)0;
dest_id = (MSI_ADDRESS_HEADER << MSI_ADDRESS_HEADER_SHIFT) |
(MSI_TARGET_CPU << MSI_TARGET_CPU_SHIFT);
msi_address->lo_address.u.dest_mode = MSI_LOGICAL_MODE;
msi_address->lo_address.u.redirection_hint = MSI_REDIRECTION_HINT_MODE;
msi_address->lo_address.u.dest_id = dest_id;
}
static int pci_vector_resources(void)
{
static int res = -EINVAL;
int nr_free_vectors;
if (res == -EINVAL) {
int i, repeat;
for (i = NR_REPEATS; i > 0; i--) {
if ((FIRST_DEVICE_VECTOR + i * 8) > FIRST_SYSTEM_VECTOR)
continue;
break;
}
i++;
repeat = (FIRST_SYSTEM_VECTOR - FIRST_DEVICE_VECTOR)/i;
res = i * repeat - NR_RESERVED_VECTORS + 1;
}
nr_free_vectors = res + nr_released_vectors - nr_alloc_vectors;
return nr_free_vectors;
}
int assign_irq_vector(int irq)
{
static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
if (irq != MSI_AUTO && IO_APIC_VECTOR(irq) > 0)
return IO_APIC_VECTOR(irq);
next:
current_vector += 8;
if (current_vector == SYSCALL_VECTOR)
goto next;
if (current_vector > FIRST_SYSTEM_VECTOR) {
offset++;
current_vector = FIRST_DEVICE_VECTOR + offset;
}
if (current_vector == FIRST_SYSTEM_VECTOR)
return -ENOSPC;
vector_irq[current_vector] = irq;
if (irq != MSI_AUTO)
IO_APIC_VECTOR(irq) = current_vector;
nr_alloc_vectors++;
return current_vector;
}
static int assign_msi_vector(void)
{
static int new_vector_avail = 1;
int vector;
unsigned long flags;
/*
* msi_lock is provided to ensure that successful allocation of MSI
* vector is assigned unique among drivers.
*/
spin_lock_irqsave(&msi_lock, flags);
if (!(pci_vector_resources() > 0)) {
spin_unlock_irqrestore(&msi_lock, flags);
return -EBUSY;
}
if (!new_vector_avail) {
/*
* vector_irq[] = -1 indicates that this specific vector is:
* - assigned for MSI (since MSI have no associated IRQ) or
* - assigned for legacy if less than 16, or
* - having no corresponding 1:1 vector-to-IOxAPIC IRQ mapping
* vector_irq[] = 0 indicates that this vector, previously
* assigned for MSI, is freed by hotplug removed operations.
* This vector will be reused for any subsequent hotplug added
* operations.
* vector_irq[] > 0 indicates that this vector is assigned for
* IOxAPIC IRQs. This vector and its value provides a 1-to-1
* vector-to-IOxAPIC IRQ mapping.
*/
for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) {
if (vector_irq[vector] != 0)
continue;
vector_irq[vector] = -1;
nr_released_vectors--;
spin_unlock_irqrestore(&msi_lock, flags);
return vector;
}
spin_unlock_irqrestore(&msi_lock, flags);
return -EBUSY;
}
vector = assign_irq_vector(MSI_AUTO);
if (vector == (FIRST_SYSTEM_VECTOR - 8))
new_vector_avail = 0;
spin_unlock_irqrestore(&msi_lock, flags);
return vector;
}
static int get_new_vector(void)
{
int vector;
if ((vector = assign_msi_vector()) > 0)
set_intr_gate(vector, interrupt[vector]);
return vector;
}
static int msi_init(void)
{
static int status = -ENOMEM;
if (!status)
return status;
if ((status = msi_cache_init()) < 0) {
pci_msi_enable = 0;
printk(KERN_INFO "WARNING: MSI INIT FAILURE\n");
return status;
}
printk(KERN_INFO "MSI INIT SUCCESS\n");
return status;
}
static int get_msi_vector(struct pci_dev *dev)
{
return get_new_vector();
}
static struct msi_desc* alloc_msi_entry(void)
{
struct msi_desc *entry;
entry = (struct msi_desc*) kmem_cache_alloc(msi_cachep, SLAB_KERNEL);
if (!entry)
return NULL;
memset(entry, 0, sizeof(struct msi_desc));
entry->link.tail = entry->link.head = 0; /* single message */
entry->dev = NULL;
return entry;
}
static void attach_msi_entry(struct msi_desc *entry, int vector)
{
unsigned long flags;
spin_lock_irqsave(&msi_lock, flags);
msi_desc[vector] = entry;
spin_unlock_irqrestore(&msi_lock, flags);
}
static void irq_handler_init(int cap_id, int pos, int mask)
{
spin_lock(&irq_desc[pos].lock);
if (cap_id == PCI_CAP_ID_MSIX)
irq_desc[pos].handler = &msix_irq_type;
else {
if (!mask)
irq_desc[pos].handler = &msi_irq_wo_maskbit_type;
else
irq_desc[pos].handler = &msi_irq_w_maskbit_type;
}
spin_unlock(&irq_desc[pos].lock);
}
static void enable_msi_mode(struct pci_dev *dev, int pos, int type)
{
u32 control;
dev->bus->ops->read(dev->bus, dev->devfn,
msi_control_reg(pos), 2, &control);
if (type == PCI_CAP_ID_MSI) {
/* Set enabled bits to single MSI & enable MSI_enable bit */
msi_enable(control, 1);
dev->bus->ops->write(dev->bus, dev->devfn,
msi_control_reg(pos), 2, control);
} else {
msix_enable(control);
dev->bus->ops->write(dev->bus, dev->devfn,
msi_control_reg(pos), 2, control);
}
if (pci_find_capability(dev, PCI_CAP_ID_EXP)) {
/* PCI Express Endpoint device detected */
u32 cmd;
dev->bus->ops->read(dev->bus, dev->devfn, PCI_COMMAND, 2, &cmd);
cmd |= PCI_COMMAND_INTX_DISABLE;
dev->bus->ops->write(dev->bus, dev->devfn, PCI_COMMAND, 2, cmd);
}
}
static void disable_msi_mode(struct pci_dev *dev, int pos, int type)
{
u32 control;
dev->bus->ops->read(dev->bus, dev->devfn,
msi_control_reg(pos), 2, &control);
if (type == PCI_CAP_ID_MSI) {
/* Set enabled bits to single MSI & enable MSI_enable bit */
msi_disable(control);
dev->bus->ops->write(dev->bus, dev->devfn,
msi_control_reg(pos), 2, control);
} else {
msix_disable(control);
dev->bus->ops->write(dev->bus, dev->devfn,
msi_control_reg(pos), 2, control);
}
if (pci_find_capability(dev, PCI_CAP_ID_EXP)) {
/* PCI Express Endpoint device detected */
u32 cmd;
dev->bus->ops->read(dev->bus, dev->devfn, PCI_COMMAND, 2, &cmd);
cmd &= ~PCI_COMMAND_INTX_DISABLE;
dev->bus->ops->write(dev->bus, dev->devfn, PCI_COMMAND, 2, cmd);
}
}
static int msi_lookup_vector(struct pci_dev *dev)
{
int vector;
unsigned long flags;
spin_lock_irqsave(&msi_lock, flags);
for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) {
if (!msi_desc[vector] || msi_desc[vector]->dev != dev ||
msi_desc[vector]->msi_attrib.entry_nr ||
msi_desc[vector]->msi_attrib.default_vector != dev->irq)
continue; /* not entry 0, skip */
spin_unlock_irqrestore(&msi_lock, flags);
/* This pre-assigned entry-0 MSI vector for this device
already exits. Override dev->irq with this vector */
dev->irq = vector;
return 0;
}
spin_unlock_irqrestore(&msi_lock, flags);
return -EACCES;
}
void pci_scan_msi_device(struct pci_dev *dev)
{
if (!dev)
return;
if (pci_find_capability(dev, PCI_CAP_ID_MSIX) > 0) {
nr_reserved_vectors++;
nr_msix_devices++;
} else if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0)
nr_reserved_vectors++;
}
/**
* msi_capability_init - configure device's MSI capability structure
* @dev: pointer to the pci_dev data structure of MSI device function
*
* Setup the MSI capability structure of device funtion with a single
* MSI vector, regardless of device function is capable of handling
* multiple messages. A return of zero indicates the successful setup
* of an entry zero with the new MSI vector or non-zero for otherwise.
**/
static int msi_capability_init(struct pci_dev *dev)
{
struct msi_desc *entry;
struct msg_address address;
struct msg_data data;
int pos, vector;
u32 control;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!pos)
return -EINVAL;
dev->bus->ops->read(dev->bus, dev->devfn, msi_control_reg(pos),
2, &control);
if (control & PCI_MSI_FLAGS_ENABLE)
return 0;
if (!msi_lookup_vector(dev)) {
/* Lookup Sucess */
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
return 0;
}
/* MSI Entry Initialization */
if (!(entry = alloc_msi_entry()))
return -ENOMEM;
if ((vector = get_msi_vector(dev)) < 0) {
kmem_cache_free(msi_cachep, entry);
return -EBUSY;
}
entry->msi_attrib.type = PCI_CAP_ID_MSI;
entry->msi_attrib.entry_nr = 0;
entry->msi_attrib.maskbit = is_mask_bit_support(control);
entry->msi_attrib.default_vector = dev->irq;
dev->irq = vector; /* save default pre-assigned ioapic vector */
entry->dev = dev;
if (is_mask_bit_support(control)) {
entry->mask_base = msi_mask_bits_reg(pos,
is_64bit_address(control));
}
/* Replace with MSI handler */
irq_handler_init(PCI_CAP_ID_MSI, vector, entry->msi_attrib.maskbit);
/* Configure MSI capability structure */
msi_address_init(&address);
msi_data_init(&data, vector);
entry->msi_attrib.current_cpu = ((address.lo_address.u.dest_id >>
MSI_TARGET_CPU_SHIFT) & MSI_TARGET_CPU_MASK);
dev->bus->ops->write(dev->bus, dev->devfn, msi_lower_address_reg(pos),
4, address.lo_address.value);
if (is_64bit_address(control)) {
dev->bus->ops->write(dev->bus, dev->devfn,
msi_upper_address_reg(pos), 4, address.hi_address);
dev->bus->ops->write(dev->bus, dev->devfn,
msi_data_reg(pos, 1), 2, *((u32*)&data));
} else
dev->bus->ops->write(dev->bus, dev->devfn,
msi_data_reg(pos, 0), 2, *((u32*)&data));
if (entry->msi_attrib.maskbit) {
unsigned int maskbits, temp;
/* All MSIs are unmasked by default, Mask them all */
dev->bus->ops->read(dev->bus, dev->devfn,
msi_mask_bits_reg(pos, is_64bit_address(control)), 4,
&maskbits);
temp = (1 << multi_msi_capable(control));
temp = ((temp - 1) & ~temp);
maskbits |= temp;
dev->bus->ops->write(dev->bus, dev->devfn,
msi_mask_bits_reg(pos, is_64bit_address(control)), 4,
maskbits);
}
attach_msi_entry(entry, vector);
/* Set MSI enabled bits */
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
return 0;
}
/**
* msix_capability_init - configure device's MSI-X capability
* @dev: pointer to the pci_dev data structure of MSI-X device function
*
* Setup the MSI-X capability structure of device funtion with a
* single MSI-X vector. A return of zero indicates the successful setup
* of an entry zero with the new MSI-X vector or non-zero for otherwise.
* To request for additional MSI-X vectors, the device drivers are
* required to utilize the following supported APIs:
* 1) msi_alloc_vectors(...) for requesting one or more MSI-X vectors
* 2) msi_free_vectors(...) for releasing one or more MSI-X vectors
* back to PCI subsystem before calling free_irq(...)
**/
static int msix_capability_init(struct pci_dev *dev)
{
struct msi_desc *entry;
struct msg_address address;
struct msg_data data;
int vector = 0, pos, dev_msi_cap;
u32 phys_addr, table_offset;
u32 control;
u8 bir;
void *base;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (!pos)
return -EINVAL;
/* Request & Map MSI-X table region */
dev->bus->ops->read(dev->bus, dev->devfn, msi_control_reg(pos), 2,
&control);
if (control & PCI_MSIX_FLAGS_ENABLE)
return 0;
if (!msi_lookup_vector(dev)) {
/* Lookup Sucess */
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
return 0;
}
dev_msi_cap = multi_msix_capable(control);
dev->bus->ops->read(dev->bus, dev->devfn,
msix_table_offset_reg(pos), 4, &table_offset);
bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
phys_addr = pci_resource_start (dev, bir);
phys_addr += (u32)(table_offset & ~PCI_MSIX_FLAGS_BIRMASK);
if (!request_mem_region(phys_addr,
dev_msi_cap * PCI_MSIX_ENTRY_SIZE,
"MSI-X iomap Failure"))
return -ENOMEM;
base = ioremap_nocache(phys_addr, dev_msi_cap * PCI_MSIX_ENTRY_SIZE);
if (base == NULL)
goto free_region;
/* MSI Entry Initialization */
entry = alloc_msi_entry();
if (!entry)
goto free_iomap;
if ((vector = get_msi_vector(dev)) < 0)
goto free_entry;
entry->msi_attrib.type = PCI_CAP_ID_MSIX;
entry->msi_attrib.entry_nr = 0;
entry->msi_attrib.maskbit = 1;
entry->msi_attrib.default_vector = dev->irq;
dev->irq = vector; /* save default pre-assigned ioapic vector */
entry->dev = dev;
entry->mask_base = (unsigned long)base;
/* Replace with MSI handler */
irq_handler_init(PCI_CAP_ID_MSIX, vector, 1);
/* Configure MSI-X capability structure */
msi_address_init(&address);
msi_data_init(&data, vector);
entry->msi_attrib.current_cpu = ((address.lo_address.u.dest_id >>
MSI_TARGET_CPU_SHIFT) & MSI_TARGET_CPU_MASK);
writel(address.lo_address.value, base + PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
writel(address.hi_address, base + PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
writel(*(u32*)&data, base + PCI_MSIX_ENTRY_DATA_OFFSET);
/* Initialize all entries from 1 up to 0 */
for (pos = 1; pos < dev_msi_cap; pos++) {
writel(0, base + pos * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
writel(0, base + pos * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
writel(0, base + pos * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_DATA_OFFSET);
}
attach_msi_entry(entry, vector);
/* Set MSI enabled bits */
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
return 0;
free_entry:
kmem_cache_free(msi_cachep, entry);
free_iomap:
iounmap(base);
free_region:
release_mem_region(phys_addr, dev_msi_cap * PCI_MSIX_ENTRY_SIZE);
return ((vector < 0) ? -EBUSY : -ENOMEM);
}
/**
* pci_enable_msi - configure device's MSI(X) capability structure
* @dev: pointer to the pci_dev data structure of MSI(X) device function
*
* Setup the MSI/MSI-X capability structure of device function with
* a single MSI(X) vector upon its software driver call to request for
* MSI(X) mode enabled on its hardware device function. A return of zero
* indicates the successful setup of an entry zero with the new MSI(X)
* vector or non-zero for otherwise.
**/
int pci_enable_msi(struct pci_dev* dev)
{
int status = -EINVAL;
if (!pci_msi_enable || !dev)
return status;
if (msi_init() < 0)
return -ENOMEM;
if ((status = msix_capability_init(dev)) == -EINVAL)
status = msi_capability_init(dev);
if (!status)
nr_reserved_vectors--;
return status;
}
static int msi_free_vector(struct pci_dev* dev, int vector);
static void pci_disable_msi(unsigned int vector)
{
int head, tail, type, default_vector;
struct msi_desc *entry;
struct pci_dev *dev;
unsigned long flags;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[vector];
if (!entry || !entry->dev) {
spin_unlock_irqrestore(&msi_lock, flags);
return;
}
dev = entry->dev;
type = entry->msi_attrib.type;
head = entry->link.head;
tail = entry->link.tail;
default_vector = entry->msi_attrib.default_vector;
spin_unlock_irqrestore(&msi_lock, flags);
disable_msi_mode(dev, pci_find_capability(dev, type), type);
/* Restore dev->irq to its default pin-assertion vector */
dev->irq = default_vector;
if (type == PCI_CAP_ID_MSIX && head != tail) {
/* Bad driver, which do not call msi_free_vectors before exit.
We must do a cleanup here */
while (1) {
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[vector];
head = entry->link.head;
tail = entry->link.tail;
spin_unlock_irqrestore(&msi_lock, flags);
if (tail == head)
break;
if (msi_free_vector(dev, entry->link.tail))
break;
}
}
}
static int msi_alloc_vector(struct pci_dev* dev, int head)
{
struct msi_desc *entry;
struct msg_address address;
struct msg_data data;
int i, offset, pos, dev_msi_cap, vector;
u32 low_address, control;
unsigned long base = 0L;
unsigned long flags;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[dev->irq];
if (!entry) {
spin_unlock_irqrestore(&msi_lock, flags);
return -EINVAL;
}
base = entry->mask_base;
spin_unlock_irqrestore(&msi_lock, flags);
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
dev->bus->ops->read(dev->bus, dev->devfn, msi_control_reg(pos),
2, &control);
dev_msi_cap = multi_msix_capable(control);
for (i = 1; i < dev_msi_cap; i++) {
if (!(low_address = readl(base + i * PCI_MSIX_ENTRY_SIZE)))
break;
}
if (i >= dev_msi_cap)
return -EINVAL;
/* MSI Entry Initialization */
if (!(entry = alloc_msi_entry()))
return -ENOMEM;
if ((vector = get_new_vector()) < 0) {
kmem_cache_free(msi_cachep, entry);
return vector;
}
entry->msi_attrib.type = PCI_CAP_ID_MSIX;
entry->msi_attrib.entry_nr = i;
entry->msi_attrib.maskbit = 1;
entry->dev = dev;
entry->link.head = head;
entry->mask_base = base;
irq_handler_init(PCI_CAP_ID_MSIX, vector, 1);
/* Configure MSI-X capability structure */
msi_address_init(&address);
msi_data_init(&data, vector);
entry->msi_attrib.current_cpu = ((address.lo_address.u.dest_id >>
MSI_TARGET_CPU_SHIFT) & MSI_TARGET_CPU_MASK);
offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
writel(address.lo_address.value, base + offset +
PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
writel(address.hi_address, base + offset +
PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
writel(*(u32*)&data, base + offset + PCI_MSIX_ENTRY_DATA_OFFSET);
writel(1, base + offset + PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
attach_msi_entry(entry, vector);
return vector;
}
static int msi_free_vector(struct pci_dev* dev, int vector)
{
struct msi_desc *entry;
int entry_nr, type;
unsigned long base = 0L;
unsigned long flags;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[vector];
if (!entry || entry->dev != dev) {
spin_unlock_irqrestore(&msi_lock, flags);
return -EINVAL;
}
type = entry->msi_attrib.type;
entry_nr = entry->msi_attrib.entry_nr;
base = entry->mask_base;
if (entry->link.tail != entry->link.head) {
msi_desc[entry->link.head]->link.tail = entry->link.tail;
if (entry->link.tail)
msi_desc[entry->link.tail]->link.head = entry->link.head;
}
entry->dev = NULL;
vector_irq[vector] = 0;
nr_released_vectors++;
msi_desc[vector] = NULL;
spin_unlock_irqrestore(&msi_lock, flags);
kmem_cache_free(msi_cachep, entry);
if (type == PCI_CAP_ID_MSIX) {
int offset;
offset = entry_nr * PCI_MSIX_ENTRY_SIZE;
writel(1, base + offset + PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
writel(0, base + offset + PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
}
return 0;
}
/**
* msi_alloc_vectors - allocate additional MSI-X vectors
* @dev: pointer to the pci_dev data structure of MSI-X device function
* @vector: pointer to an array of new allocated MSI-X vectors
* @nvec: number of MSI-X vectors requested for allocation by device driver
*
* Allocate additional MSI-X vectors requested by device driver. A
* return of zero indicates the successful setup of MSI-X capability
* structure with new allocated MSI-X vectors or non-zero for otherwise.
**/
int msi_alloc_vectors(struct pci_dev* dev, int *vector, int nvec)
{
struct msi_desc *entry;
int i, head, pos, vec, free_vectors, alloc_vectors;
int *vectors = (int *)vector;
u32 control;
unsigned long flags;
if (!pci_msi_enable || !dev)
return -EINVAL;
if (!(pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)))
return -EINVAL;
dev->bus->ops->read(dev->bus, dev->devfn, msi_control_reg(pos), 2, &control);
if (nvec > multi_msix_capable(control))
return -EINVAL;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[dev->irq];
if (!entry || entry->dev != dev || /* legal call */
entry->msi_attrib.type != PCI_CAP_ID_MSIX || /* must be MSI-X */
entry->link.head != entry->link.tail) { /* already multi */
spin_unlock_irqrestore(&msi_lock, flags);
return -EINVAL;
}
/*
* msi_lock is provided to ensure that enough vectors resources are
* available before granting.
*/
free_vectors = pci_vector_resources();
/* Ensure that each MSI/MSI-X device has one vector reserved by
default to avoid any MSI-X driver to take all available
resources */
free_vectors -= nr_reserved_vectors;
/* Find the average of free vectors among MSI-X devices */
if (nr_msix_devices > 0)
free_vectors /= nr_msix_devices;
spin_unlock_irqrestore(&msi_lock, flags);
if (nvec > free_vectors)
return -EBUSY;
alloc_vectors = 0;
head = dev->irq;
for (i = 0; i < nvec; i++) {
if ((vec = msi_alloc_vector(dev, head)) < 0)
break;
*(vectors + i) = vec;
head = vec;
alloc_vectors++;
}
if (alloc_vectors != nvec) {
for (i = 0; i < alloc_vectors; i++) {
vec = *(vectors + i);
msi_free_vector(dev, vec);
}
spin_lock_irqsave(&msi_lock, flags);
msi_desc[dev->irq]->link.tail = msi_desc[dev->irq]->link.head;
spin_unlock_irqrestore(&msi_lock, flags);
return -EBUSY;
}
if (nr_msix_devices > 0)
nr_msix_devices--;
return 0;
}
/**
* msi_free_vectors - reclaim MSI-X vectors to unused state
* @dev: pointer to the pci_dev data structure of MSI-X device function
* @vector: pointer to an array of released MSI-X vectors
* @nvec: number of MSI-X vectors requested for release by device driver
*
* Reclaim MSI-X vectors released by device driver to unused state,
* which may be used later on. A return of zero indicates the
* success or non-zero for otherwise. Device driver should call this
* before calling function free_irq.
**/
int msi_free_vectors(struct pci_dev* dev, int *vector, int nvec)
{
struct msi_desc *entry;
int i;
unsigned long flags;
if (!pci_msi_enable)
return -EINVAL;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[dev->irq];
if (!entry || entry->dev != dev ||
entry->msi_attrib.type != PCI_CAP_ID_MSIX ||
entry->link.head == entry->link.tail) { /* Nothing to free */
spin_unlock_irqrestore(&msi_lock, flags);
return -EINVAL;
}
spin_unlock_irqrestore(&msi_lock, flags);
for (i = 0; i < nvec; i++) {
if (*(vector + i) == dev->irq)
continue;/* Don't free entry 0 if mistaken by driver */
msi_free_vector(dev, *(vector + i));
}
return 0;
}
/**
* msi_remove_pci_irq_vectors - reclaim MSI(X) vectors to unused state
* @dev: pointer to the pci_dev data structure of MSI(X) device function
*
* Being called during hotplug remove, from which the device funciton
* is hot-removed. All previous assigned MSI/MSI-X vectors, if
* allocated for this device function, are reclaimed to unused state,
* which may be used later on.
**/
void msi_remove_pci_irq_vectors(struct pci_dev* dev)
{
struct msi_desc *entry;
int type, temp;
unsigned long flags;
if (!pci_msi_enable || !dev)
return;
if (!pci_find_capability(dev, PCI_CAP_ID_MSI)) {
if (!pci_find_capability(dev, PCI_CAP_ID_MSIX))
return;
}
temp = dev->irq;
if (msi_lookup_vector(dev))
return;
spin_lock_irqsave(&msi_lock, flags);
entry = msi_desc[dev->irq];
if (!entry || entry->dev != dev) {
spin_unlock_irqrestore(&msi_lock, flags);
return;
}
type = entry->msi_attrib.type;
spin_unlock_irqrestore(&msi_lock, flags);
msi_free_vector(dev, dev->irq);
if (type == PCI_CAP_ID_MSIX) {
int i, pos, dev_msi_cap;
u32 phys_addr, table_offset;
u32 control;
u8 bir;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
dev->bus->ops->read(dev->bus, dev->devfn, msi_control_reg(pos), 2, &control);
dev_msi_cap = multi_msix_capable(control);
dev->bus->ops->read(dev->bus, dev->devfn,
msix_table_offset_reg(pos), 4, &table_offset);
bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
phys_addr = pci_resource_start (dev, bir);
phys_addr += (u32)(table_offset & ~PCI_MSIX_FLAGS_BIRMASK);
for (i = FIRST_DEVICE_VECTOR; i < NR_IRQS; i++) {
spin_lock_irqsave(&msi_lock, flags);
if (!msi_desc[i] || msi_desc[i]->dev != dev) {
spin_unlock_irqrestore(&msi_lock, flags);
continue;
}
spin_unlock_irqrestore(&msi_lock, flags);
msi_free_vector(dev, i);
}
writel(1, entry->mask_base + PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
iounmap((void*)entry->mask_base);
release_mem_region(phys_addr, dev_msi_cap * PCI_MSIX_ENTRY_SIZE);
}
dev->irq = temp;
nr_reserved_vectors++;
}
EXPORT_SYMBOL(pci_enable_msi);
EXPORT_SYMBOL(msi_alloc_vectors);
EXPORT_SYMBOL(msi_free_vectors);
drivers/pci/probe.c
View file @ f036d4ea
......@@ -552,6 +552,7 @@ int __devinit pci_scan_slot(struct pci_bus *bus, int devfn)
struct pci_dev *dev;
dev = pci_scan_device(bus, devfn);
pci_scan_msi_device(dev);
if (func == 0) {
if (!dev)
break;
......
drivers/pci/remove.c
View file @ f036d4ea
......@@ -14,6 +14,8 @@ static void pci_free_resources(struct pci_dev *dev)
{
int i;
msi_remove_pci_irq_vectors(dev);
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *res = dev->resource + i;
if (res->parent)
......
include/asm-i386/hw_irq.h
View file @ f036d4ea
......@@ -41,6 +41,7 @@ asmlinkage void apic_timer_interrupt(void);
asmlinkage void error_interrupt(void);
asmlinkage void spurious_interrupt(void);
asmlinkage void thermal_interrupt(struct pt_regs);
#define platform_legacy_irq(irq) ((irq) < 16)
#endif
void mask_irq(unsigned int irq);
......
include/asm-i386/io_apic.h
View file @ f036d4ea
......@@ -13,6 +13,46 @@
#ifdef CONFIG_X86_IO_APIC
#ifdef CONFIG_PCI_USE_VECTOR
static inline int use_pci_vector(void) {return 1;}
static inline void disable_edge_ioapic_vector(unsigned int vector) { }
static inline void mask_and_ack_level_ioapic_vector(unsigned int vector) { }
static inline void end_edge_ioapic_vector (unsigned int vector) { }
#define startup_level_ioapic startup_level_ioapic_vector
#define shutdown_level_ioapic mask_IO_APIC_vector
#define enable_level_ioapic unmask_IO_APIC_vector
#define disable_level_ioapic mask_IO_APIC_vector
#define mask_and_ack_level_ioapic mask_and_ack_level_ioapic_vector
#define end_level_ioapic end_level_ioapic_vector
#define set_ioapic_affinity set_ioapic_affinity_vector
#define startup_edge_ioapic startup_edge_ioapic_vector
#define shutdown_edge_ioapic disable_edge_ioapic_vector
#define enable_edge_ioapic unmask_IO_APIC_vector
#define disable_edge_ioapic disable_edge_ioapic_vector
#define ack_edge_ioapic ack_edge_ioapic_vector
#define end_edge_ioapic end_edge_ioapic_vector
#else
static inline int use_pci_vector(void) {return 0;}
static inline void disable_edge_ioapic_irq(unsigned int irq) { }
static inline void mask_and_ack_level_ioapic_irq(unsigned int irq) { }
static inline void end_edge_ioapic_irq (unsigned int irq) { }
#define startup_level_ioapic startup_level_ioapic_irq
#define shutdown_level_ioapic mask_IO_APIC_irq
#define enable_level_ioapic unmask_IO_APIC_irq
#define disable_level_ioapic mask_IO_APIC_irq
#define mask_and_ack_level_ioapic mask_and_ack_level_ioapic_irq
#define end_level_ioapic end_level_ioapic_irq
#define set_ioapic_affinity set_ioapic_affinity_irq
#define startup_edge_ioapic startup_edge_ioapic_irq
#define shutdown_edge_ioapic disable_edge_ioapic_irq
#define enable_edge_ioapic unmask_IO_APIC_irq
#define disable_edge_ioapic disable_edge_ioapic_irq
#define ack_edge_ioapic ack_edge_ioapic_irq
#define end_edge_ioapic end_edge_ioapic_irq
#endif
#define APIC_MISMATCH_DEBUG
#define IO_APIC_BASE(idx) \
......@@ -177,4 +217,6 @@ extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level
#define io_apic_assign_pci_irqs 0
#endif
extern int assign_irq_vector(int irq);
#endif
include/asm-i386/mach-default/irq_vectors.h
View file @ f036d4ea
......@@ -76,6 +76,18 @@
* Since vectors 0x00-0x1f are used/reserved for the CPU,
* the usable vector space is 0x20-0xff (224 vectors)
*/
/*
* The maximum number of vectors supported by i386 processors
* is limited to 256. For processors other than i386, NR_VECTORS
* should be changed accordingly.
*/
#define NR_VECTORS 256
#ifdef CONFIG_PCI_USE_VECTOR
#define NR_IRQS FIRST_SYSTEM_VECTOR
#define NR_IRQ_VECTORS NR_IRQS
#else
#ifdef CONFIG_X86_IO_APIC
#define NR_IRQS 224
# if (224 >= 32 * NR_CPUS)
......@@ -87,6 +99,7 @@
#define NR_IRQS 16
#define NR_IRQ_VECTORS NR_IRQS
#endif
#endif
#define FPU_IRQ 13
......
include/asm-x86_64/hw_irq.h
View file @ f036d4ea
......@@ -173,6 +173,8 @@ static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {
static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
#endif
#define platform_legacy_irq(irq) ((irq) < 16)
#endif
#endif /* _ASM_HW_IRQ_H */
include/asm-x86_64/io_apic.h
View file @ f036d4ea
......@@ -174,6 +174,25 @@ extern int sis_apic_bug; /* dummy */
#define io_apic_assign_pci_irqs 0
#endif
static inline int use_pci_vector(void) {return 0;}
static inline void disable_edge_ioapic_irq(unsigned int irq) { }
static inline void mask_and_ack_level_ioapic_irq(unsigned int irq) { }
static inline void end_edge_ioapic_irq (unsigned int irq) { }
#define startup_level_ioapic startup_level_ioapic_irq
#define shutdown_level_ioapic mask_IO_APIC_irq
#define enable_level_ioapic unmask_IO_APIC_irq
#define disable_level_ioapic mask_IO_APIC_irq
#define mask_and_ack_level_ioapic mask_and_ack_level_ioapic_irq
#define end_level_ioapic end_level_ioapic_irq
#define set_ioapic_affinity set_ioapic_affinity_irq
#define startup_edge_ioapic startup_edge_ioapic_irq
#define shutdown_edge_ioapic disable_edge_ioapic_irq
#define enable_edge_ioapic unmask_IO_APIC_irq
#define disable_edge_ioapic disable_edge_ioapic_irq
#define ack_edge_ioapic ack_edge_ioapic_irq
#define end_edge_ioapic end_edge_ioapic_irq
void enable_NMI_through_LVT0 (void * dummy);
#endif
include/linux/pci.h
View file @ f036d4ea
......@@ -36,6 +36,7 @@
#define PCI_COMMAND_WAIT 0x80 /* Enable address/data stepping */
#define PCI_COMMAND_SERR 0x100 /* Enable SERR */
#define PCI_COMMAND_FAST_BACK 0x200 /* Enable back-to-back writes */
#define PCI_COMMAND_INTX_DISABLE 0x400 /* INTx Emulation Disable */
#define PCI_STATUS 0x06 /* 16 bits */
#define PCI_STATUS_CAP_LIST 0x10 /* Support Capability List */
......@@ -198,6 +199,8 @@
#define PCI_CAP_ID_MSI 0x05 /* Message Signalled Interrupts */
#define PCI_CAP_ID_CHSWP 0x06 /* CompactPCI HotSwap */
#define PCI_CAP_ID_PCIX 0x07 /* PCI-X */
#define PCI_CAP_ID_EXP 0x10 /* PCI Express */
#define PCI_CAP_ID_MSIX 0x11 /* MSI-X */
#define PCI_CAP_LIST_NEXT 1 /* Next capability in the list */
#define PCI_CAP_FLAGS 2 /* Capability defined flags (16 bits) */
#define PCI_CAP_SIZEOF 4
......@@ -275,11 +278,13 @@
#define PCI_MSI_FLAGS_QSIZE 0x70 /* Message queue size configured */
#define PCI_MSI_FLAGS_QMASK 0x0e /* Maximum queue size available */
#define PCI_MSI_FLAGS_ENABLE 0x01 /* MSI feature enabled */
#define PCI_MSI_FLAGS_MASKBIT 0x100 /* 64-bit mask bits allowed */
#define PCI_MSI_RFU 3 /* Rest of capability flags */
#define PCI_MSI_ADDRESS_LO 4 /* Lower 32 bits */
#define PCI_MSI_ADDRESS_HI 8 /* Upper 32 bits (if PCI_MSI_FLAGS_64BIT set) */
#define PCI_MSI_DATA_32 8 /* 16 bits of data for 32-bit devices */
#define PCI_MSI_DATA_64 12 /* 16 bits of data for 64-bit devices */
#define PCI_MSI_MASK_BIT 16 /* Mask bits register */
/* CompactPCI Hotswap Register */
......@@ -695,6 +700,18 @@ void pci_pool_free (struct pci_pool *pool, void *vaddr, dma_addr_t addr);
extern struct pci_dev *isa_bridge;
#endif
#ifndef CONFIG_PCI_USE_VECTOR
static inline void pci_scan_msi_device(struct pci_dev *dev) {}
static inline int pci_enable_msi(struct pci_dev *dev) {return -1;}
static inline void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
#else
extern void pci_scan_msi_device(struct pci_dev *dev);
extern int pci_enable_msi(struct pci_dev *dev);
extern void msi_remove_pci_irq_vectors(struct pci_dev *dev);
extern int msi_alloc_vectors(struct pci_dev* dev, int *vector, int nvec);
extern int msi_free_vectors(struct pci_dev* dev, int *vector, int nvec);
#endif
#endif /* CONFIG_PCI */
/* Include architecture-dependent settings and functions */
......
include/linux/pci_msi.h 0 → 100644
View file @ f036d4ea
/*
* ../include/linux/pci_msi.h
*
*/
#ifndef _ASM_PCI_MSI_H
#define _ASM_PCI_MSI_H
#include <linux/pci.h>
#define MSI_AUTO -1
#define NR_REPEATS 23
#define NR_RESERVED_VECTORS 3 /*FIRST_DEVICE_VECTOR,FIRST_SYSTEM_VECTOR,0x80 */
/*
* Assume the maximum number of hot plug slots supported by the system is about
* ten. The worstcase is that each of these slots is hot-added with a device,
* which has two MSI/MSI-X capable functions. To avoid any MSI-X driver, which
* attempts to request all available vectors, NR_HP_RESERVED_VECTORS is defined
* as below to ensure at least one message is assigned to each detected MSI/
* MSI-X device function.
*/
#define NR_HP_RESERVED_VECTORS 20
extern int vector_irq[NR_IRQS];
extern cpumask_t pending_irq_balance_cpumask[NR_IRQS];
extern void (*interrupt[NR_IRQS])(void);
#ifdef CONFIG_SMP
#define set_msi_irq_affinity set_msi_affinity
#else
#define set_msi_irq_affinity NULL
static inline void move_msi(int vector) {}
#endif
#ifndef CONFIG_X86_IO_APIC
static inline int get_ioapic_vector(struct pci_dev *dev) { return -1;}
static inline void restore_ioapic_irq_handler(int irq) {}
#else
extern void restore_ioapic_irq_handler(int irq);
#endif
/*
* MSI-X Address Register
*/
#define PCI_MSIX_FLAGS_QSIZE 0x7FF
#define PCI_MSIX_FLAGS_ENABLE (1 << 15)
#define PCI_MSIX_FLAGS_BIRMASK (7 << 0)
#define PCI_MSIX_FLAGS_BITMASK (1 << 0)
#define PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET 0
#define PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET 4
#define PCI_MSIX_ENTRY_DATA_OFFSET 8
#define PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET 12
#define PCI_MSIX_ENTRY_SIZE 16
#define msi_control_reg(base) (base + PCI_MSI_FLAGS)
#define msi_lower_address_reg(base) (base + PCI_MSI_ADDRESS_LO)
#define msi_upper_address_reg(base) (base + PCI_MSI_ADDRESS_HI)
#define msi_data_reg(base, is64bit) \
( (is64bit == 1) ? base+PCI_MSI_DATA_64 : base+PCI_MSI_DATA_32 )
#define msi_mask_bits_reg(base, is64bit) \
( (is64bit == 1) ? base+PCI_MSI_MASK_BIT : base+PCI_MSI_MASK_BIT-4)
#define msi_disable(control) control &= ~PCI_MSI_FLAGS_ENABLE
#define multi_msi_capable(control) \
(1 << ((control & PCI_MSI_FLAGS_QMASK) >> 1))
#define multi_msi_enable(control, num) \
control |= (((num >> 1) << 4) & PCI_MSI_FLAGS_QSIZE);
#define is_64bit_address(control) (control & PCI_MSI_FLAGS_64BIT)
#define is_mask_bit_support(control) (control & PCI_MSI_FLAGS_MASKBIT)
#define msi_enable(control, num) multi_msi_enable(control, num); \
control |= PCI_MSI_FLAGS_ENABLE
#define msix_control_reg msi_control_reg
#define msix_table_offset_reg(base) (base + 0x04)
#define msix_pba_offset_reg(base) (base + 0x08)
#define msix_enable(control) control |= PCI_MSIX_FLAGS_ENABLE
#define msix_disable(control) control &= ~PCI_MSIX_FLAGS_ENABLE
#define msix_table_size(control) ((control & PCI_MSIX_FLAGS_QSIZE)+1)
#define multi_msix_capable msix_table_size
#define msix_unmask(address) (address & ~PCI_MSIX_FLAGS_BITMASK)
#define msix_mask(address) (address | PCI_MSIX_FLAGS_BITMASK)
#define msix_is_pending(address) (address & PCI_MSIX_FLAGS_PENDMASK)
extern char __dbg_str_buf[256];
#define _DEFINE_DBG_BUFFER char __dbg_str_buf[256];
#define _DBG_K_TRACE_ENTRY ((unsigned int)0x00000001)
#define _DBG_K_TRACE_EXIT ((unsigned int)0x00000002)
#define _DBG_K_INFO ((unsigned int)0x00000004)
#define _DBG_K_ERROR ((unsigned int)0x00000008)
#define _DBG_K_TRACE (_DBG_K_TRACE_ENTRY | _DBG_K_TRACE_EXIT)
#define _DEBUG_LEVEL (_DBG_K_INFO | _DBG_K_ERROR | _DBG_K_TRACE)
#define _DBG_PRINT( dbg_flags, args... ) \
if ( _DEBUG_LEVEL & (dbg_flags) ) \
{ \
int len; \
len = sprintf(__dbg_str_buf, "%s:%d: %s ", \
__FILE__, __LINE__, __FUNCTION__ ); \
sprintf(__dbg_str_buf + len, args); \
printk(KERN_INFO "%s\n", __dbg_str_buf); \
}
#define MSI_FUNCTION_TRACE_ENTER \
_DBG_PRINT (_DBG_K_TRACE_ENTRY, "%s", "[Entry]");
#define MSI_FUNCTION_TRACE_EXIT \
_DBG_PRINT (_DBG_K_TRACE_EXIT, "%s", "[Entry]");
/*
* MSI Defined Data Structures
*/
#define MSI_ADDRESS_HEADER 0xfee
#define MSI_ADDRESS_HEADER_SHIFT 12
#define MSI_ADDRESS_HEADER_MASK 0xfff000
#define MSI_TARGET_CPU_SHIFT 4
#define MSI_TARGET_CPU_MASK 0xff
#define MSI_DELIVERY_MODE 0
#define MSI_LEVEL_MODE 1 /* Edge always assert */
#define MSI_TRIGGER_MODE 0 /* MSI is edge sensitive */
#define MSI_LOGICAL_MODE 1
#define MSI_REDIRECTION_HINT_MODE 0
#ifdef CONFIG_SMP
#define MSI_TARGET_CPU logical_smp_processor_id()
#else
#define MSI_TARGET_CPU TARGET_CPUS
#endif
struct msg_data {
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u32 vector : 8;
__u32 delivery_mode : 3; /* 000b: FIXED | 001b: lowest prior */
__u32 reserved_1 : 3;
__u32 level : 1; /* 0: deassert | 1: assert */
__u32 trigger : 1; /* 0: edge | 1: level */
__u32 reserved_2 : 16;
#elif defined(__BIG_ENDIAN_BITFIELD)
__u32 reserved_2 : 16;
__u32 trigger : 1; /* 0: edge | 1: level */
__u32 level : 1; /* 0: deassert | 1: assert */
__u32 reserved_1 : 3;
__u32 delivery_mode : 3; /* 000b: FIXED | 001b: lowest prior */
__u32 vector : 8;
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
} __attribute__ ((packed));
struct msg_address {
union {
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u32 reserved_1 : 2;
__u32 dest_mode : 1; /*0:physic | 1:logic */
__u32 redirection_hint: 1; /*0: dedicated CPU
1: lowest priority */
__u32 reserved_2 : 4;
__u32 dest_id : 24; /* Destination ID */
#elif defined(__BIG_ENDIAN_BITFIELD)
__u32 dest_id : 24; /* Destination ID */
__u32 reserved_2 : 4;
__u32 redirection_hint: 1; /*0: dedicated CPU
1: lowest priority */
__u32 dest_mode : 1; /*0:physic | 1:logic */
__u32 reserved_1 : 2;
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
}u;
__u32 value;
}lo_address;
__u32 hi_address;
} __attribute__ ((packed));
struct msi_desc {
struct {
__u8 type : 5; /* {0: unused, 5h:MSI, 11h:MSI-X} */
__u8 maskbit : 1; /* mask-pending bit supported ? */
__u8 reserved: 2; /* reserved */
__u8 entry_nr; /* specific enabled entry */
__u8 default_vector; /* default pre-assigned vector */
__u8 current_cpu; /* current destination cpu */
}msi_attrib;
struct {
__u16 head;
__u16 tail;
}link;
unsigned long mask_base;
struct pci_dev *dev;
};
#endif /* _ASM_PCI_MSI_H */
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