From: long <tlnguyen@snoqualmie.dp.intel.com>
To: tom.l.nguyen@intel.com, zwane@linuxpower.ca
Cc: greg@kroah.com, jgarzik@pobox.com, jun.nakajima@intel.com,
linux-kernel@vger.kernel.org, tlnguyen@snoqualmie.dp.intel.com
Subject: RE: Update MSI Patches
Date: Mon, 18 Aug 2003 10:28:50 -0700 [thread overview]
Message-ID: <200308181728.h7IHSolh016169@snoqualmie.dp.intel.com> (raw)
> On Sat, 16 Aug 2003, Zwane Mwaikambo wrote:
> I think a variable rename should be fine, as long as the reader doesn't
> get misled into thinking a specific variable is something which it isn't.
> index sounds fine to me, the nice thing about your patch is that we don't
> have to touch pci_dev->irq at all.
I make minor modification to the last patch to reduce some duplicate functions,
as shown as below. I think this perhaps looks better. What do you think?
+#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,
+ unsigned long cpu_mask)
+{
+ int irq = vector_to_irq(vector);
+
+ set_ioapic_affinity_irq(irq, cpu_mask);
+}
+#endif
Also, attach includes this changes and your comment on warning.
+++ linux-2.6.0-test2-create-vectorbase/arch/i386/kernel/mpparse.c 2003-08-14 13:22:03.000000000 -0400
@@ -1124,14 +1124,21 @@
+ if (!io_apic_set_pci_routing(ioapic, ioapic_pin, irq)) {
+ if (use_pci_vector() && !platform_legacy_irq(irq))
+ entry->irq = IO_APIC_VECTOR(irq);
+ else
+ entry->irq = irq;
+ }
Thanks,
Long
diff -X excludes -urN linux-2.6.0-test2/arch/i386/Kconfig linux-2.6.0-test2-create-vectorbase/arch/i386/Kconfig
--- linux-2.6.0-test2/arch/i386/Kconfig 2003-07-27 12:57:48.000000000 -0400
+++ linux-2.6.0-test2-create-vectorbase/arch/i386/Kconfig 2003-08-05 09:25:54.000000000 -0400
@@ -1072,6 +1072,17 @@
depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
default y
+config PCI_USE_VECTOR
+ bool "PCI_USE_VECTOR"
+ 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
+
+ If you don't know what to do here, say N.
+
source "drivers/pci/Kconfig"
config ISA
diff -X excludes -urN linux-2.6.0-test2/arch/i386/kernel/i8259.c linux-2.6.0-test2-create-vectorbase/arch/i386/kernel/i8259.c
--- linux-2.6.0-test2/arch/i386/kernel/i8259.c 2003-07-27 13:09:30.000000000 -0400
+++ linux-2.6.0-test2-create-vectorbase/arch/i386/kernel/i8259.c 2003-08-05 09:25:54.000000000 -0400
@@ -419,8 +419,10 @@
* 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]);
}
diff -X excludes -urN linux-2.6.0-test2/arch/i386/kernel/io_apic.c linux-2.6.0-test2-create-vectorbase/arch/i386/kernel/io_apic.c
--- linux-2.6.0-test2/arch/i386/kernel/io_apic.c 2003-07-27 13:00:21.000000000 -0400
+++ linux-2.6.0-test2-create-vectorbase/arch/i386/kernel/io_apic.c 2003-08-17 09:10:35.450919160 -0400
@@ -76,6 +76,14 @@
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 @@
clear_IO_APIC_pin(apic, pin);
}
-static void set_ioapic_affinity (unsigned int irq, unsigned long cpu_mask)
+static void set_ioapic_affinity_irq (unsigned int irq, unsigned long cpu_mask)
{
unsigned long flags;
int pin;
@@ -667,13 +675,13 @@
__setup("noirqbalance", irqbalance_disable);
-static void set_ioapic_affinity (unsigned int irq, unsigned long mask);
+static void set_ioapic_affinity_irq (unsigned int irq, unsigned long mask);
static inline void move_irq(int irq)
{
/* note - we hold the desc->lock */
if (unlikely(pending_irq_balance_cpumask[irq])) {
- set_ioapic_affinity(irq, pending_irq_balance_cpumask[irq]);
+ set_ioapic_affinity_irq(irq, pending_irq_balance_cpumask[irq]);
pending_irq_balance_cpumask[irq] = 0;
}
}
@@ -850,7 +858,7 @@
if (irq_entry == -1)
continue;
irq = pin_2_irq(irq_entry, ioapic, pin);
- set_ioapic_affinity(irq, mask);
+ set_ioapic_affinity_irq(irq, mask);
}
}
@@ -1140,8 +1148,10 @@
static int __init assign_irq_vector(int irq)
{
static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
- if (IO_APIC_VECTOR(irq) > 0)
- return IO_APIC_VECTOR(irq);
+ int vector;
+
+ if ((vector = IO_APIC_VECTOR(irq)) > 0)
+ return vector;
next:
current_vector += 8;
if (current_vector == SYSCALL_VECTOR)
@@ -1152,12 +1162,40 @@
current_vector = FIRST_DEVICE_VECTOR + offset;
}
+#ifdef CONFIG_PCI_USE_VECTOR
+ vector_irq[current_vector] = irq;
+#endif
+
IO_APIC_VECTOR(irq) = current_vector;
+
return current_vector;
}
-static struct hw_interrupt_type ioapic_level_irq_type;
-static struct hw_interrupt_type ioapic_edge_irq_type;
+static struct hw_interrupt_type ioapic_level_type;
+static struct hw_interrupt_type ioapic_edge_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)
{
@@ -1215,13 +1253,7 @@
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);
@@ -1268,7 +1300,7 @@
* 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:
@@ -1748,9 +1780,6 @@
* 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
@@ -1761,7 +1790,6 @@
* 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;
@@ -1779,8 +1807,6 @@
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
@@ -1795,9 +1821,6 @@
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
@@ -1819,10 +1842,6 @@
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;
@@ -1849,6 +1868,7 @@
* The idea is from Manfred Spraul. --macro
*/
i = IO_APIC_VECTOR(irq);
+
v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
ack_APIC_irq();
@@ -1883,7 +1903,57 @@
}
}
-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,
+ unsigned long 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,
@@ -1893,26 +1963,25 @@
* 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,
};
@@ -1932,7 +2001,13 @@
* 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
@@ -2362,9 +2437,7 @@
"IRQ %d)\n", ioapic,
mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq);
- irq_desc[irq].handler = &ioapic_level_irq_type;
-
- set_intr_gate(entry.vector, interrupt[irq]);
+ ioapic_register_intr(irq, entry.vector, IOAPIC_LEVEL);
if (!ioapic && (irq < 16))
disable_8259A_irq(irq);
diff -X excludes -urN linux-2.6.0-test2/arch/i386/kernel/mpparse.c linux-2.6.0-test2-create-vectorbase/arch/i386/kernel/mpparse.c
--- linux-2.6.0-test2/arch/i386/kernel/mpparse.c 2003-07-27 12:59:51.000000000 -0400
+++ linux-2.6.0-test2-create-vectorbase/arch/i386/kernel/mpparse.c 2003-08-14 13:22:03.000000000 -0400
@@ -1124,14 +1124,21 @@
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))
+ entry->irq = IO_APIC_VECTOR(irq);
+ else
+ entry->irq = irq;
continue;
}
mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
- if (!io_apic_set_pci_routing(ioapic, ioapic_pin, irq))
- entry->irq = irq;
+ if (!io_apic_set_pci_routing(ioapic, ioapic_pin, irq)) {
+ if (use_pci_vector() && !platform_legacy_irq(irq))
+ entry->irq = IO_APIC_VECTOR(irq);
+ else
+ entry->irq = irq;
+ }
printk(KERN_DEBUG "%02x:%02x:%02x[%c] -> %d-%d -> IRQ %d\n",
entry->id.segment, entry->id.bus,
diff -X excludes -urN linux-2.6.0-test2/arch/i386/pci/irq.c linux-2.6.0-test2-create-vectorbase/arch/i386/pci/irq.c
--- linux-2.6.0-test2/arch/i386/pci/irq.c 2003-07-27 13:11:50.000000000 -0400
+++ linux-2.6.0-test2-create-vectorbase/arch/i386/pci/irq.c 2003-08-12 14:38:09.000000000 -0400
@@ -743,6 +743,10 @@
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;
diff -X excludes -urN linux-2.6.0-test2/include/asm-i386/hw_irq.h linux-2.6.0-test2-create-vectorbase/include/asm-i386/hw_irq.h
--- linux-2.6.0-test2/include/asm-i386/hw_irq.h 2003-07-27 13:11:11.000000000 -0400
+++ linux-2.6.0-test2-create-vectorbase/include/asm-i386/hw_irq.h 2003-08-05 09:25:54.000000000 -0400
@@ -41,6 +41,7 @@
extern asmlinkage void error_interrupt(void);
extern asmlinkage void spurious_interrupt(void);
extern asmlinkage void thermal_interrupt(struct pt_regs);
+#define platform_legacy_irq(irq) ((irq) < 16)
#endif
extern void mask_irq(unsigned int irq);
diff -X excludes -urN linux-2.6.0-test2/include/asm-i386/io_apic.h linux-2.6.0-test2-create-vectorbase/include/asm-i386/io_apic.h
--- linux-2.6.0-test2/include/asm-i386/io_apic.h 2003-07-27 13:04:51.000000000 -0400
+++ linux-2.6.0-test2-create-vectorbase/include/asm-i386/io_apic.h 2003-08-12 11:48:10.000000000 -0400
@@ -11,6 +11,46 @@
* Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
*/
+#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
+
#ifdef CONFIG_X86_IO_APIC
#define APIC_MISMATCH_DEBUG
diff -X excludes -urN linux-2.6.0-test2/include/asm-i386/mach-default/irq_vectors.h linux-2.6.0-test2-create-vectorbase/include/asm-i386/mach-default/irq_vectors.h
--- linux-2.6.0-test2/include/asm-i386/mach-default/irq_vectors.h 2003-07-27 12:58:54.000000000 -0400
+++ linux-2.6.0-test2-create-vectorbase/include/asm-i386/mach-default/irq_vectors.h 2003-08-12 11:37:19.000000000 -0400
@@ -76,9 +76,19 @@
* 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_X86_IO_APIC
+#ifndef CONFIG_PCI_USE_VECTOR
#define NR_IRQS 224
#else
+#define NR_IRQS FIRST_SYSTEM_VECTOR
+#endif
+#else
#define NR_IRQS 16
#endif
next reply other threads:[~2003-08-18 18:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-18 17:28 long [this message]
2003-08-18 20:20 ` Zwane Mwaikambo
-- strict thread matches above, loose matches on Subject: below --
2003-08-18 21:24 Nguyen, Tom L
2003-08-15 20:48 Nguyen, Tom L
2003-08-16 5:01 ` Zwane Mwaikambo
2003-08-16 11:04 ` Zwane Mwaikambo
2003-08-14 19:14 long
2003-08-15 18:37 ` Zwane Mwaikambo
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