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Message-ID: <49180418.1050306@kernel.org>
Date: Mon, 10 Nov 2008 01:51:20 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] sparse_irq aka dyn_irq v10
getting closer, irq_desc can be moved according to smp_affinity.
it is getting some big now..., may split it to two patch: one only have sparse irq but don't move irq_desc
second one will move irq_desc according to affinity.
YH
----------
From: Yinghai Lu <yinghai@...nel.org>
Subject: sparseirq v10
impact: new feature sparseirq
add some kind of hash table as Ingo suggesting.
remove dyna_array
when sparse_irq is used, use kzalloc_node to get irq_desc, irq_cfg
use desc->chip_data for x86 to store irq_cfg
make irq_desc to go with affinity aka irq_desc moving etc
call move_irq_desc in irq_complete_move()
need to add struct (irq_desc **descp) to ack_edge/level to make sure desc get updated
legacy irq_desc is not moved, because they are allocated via static array
for logical apic mode, need to add move_desc_in_progress_in_same_domain. otherwise it will not get moved. ==> also could need two phase to get irq_desc moved.
for example: 0xff is old affinity, and need to set 0xf, and then set to 0xf0.
LBSuse:~ # cat /proc/irq/22/smp_affinity
00000000,00000000,00000000,000000ff
LBSuse:~ # echo f > /proc/irq/22/smp_affinity
LBSuse:~ # cat /proc/irq/22/smp_affinity
00000000,00000000,00000000,0000000f
LBSuse:~ # tail /var/log/messages
...
Oct 27 12:35:34 LBSuse kernel: klogd 1.4.1, log source = /proc/kmsg started.
Oct 27 12:35:34 LBSuse kernel: eth0: no IPv6 routers present
LBSuse:~ # echo f0 > /proc/irq/22/smp_affinity
LBSuse:~ # tail /var/log/messages
Oct 27 12:35:34 LBSuse kernel: klogd 1.4.1, log source = /proc/kmsg started.
Oct 27 12:35:34 LBSuse kernel: eth0: no IPv6 routers present
Oct 27 12:36:46 LBSuse kernel: move irq_desc for 22 aka 0x16 to cpu 7 node 1
Oct 27 12:36:46 LBSuse kernel: alloc kstat_irqs on cpu 7 node 1
Oct 27 12:36:46 LBSuse kernel: alloc irq_cfg on cpu 7 node 1
Oct 27 12:36:46 LBSuse kernel: alloc irq_2_pin on cpu 7 node 1
so assume the user space program should update /proc/irq/XX/smp_affinity to 03 or 0f at first on boot
or we change irq_default_affinity ?
for physical apic is much simple
on 4 sockets 16 cores system
irq_desc is moving..
when
# echo 10 > /proc/irq/134483967/smp_affinity
# echo 100 > /proc/irq/134483967/smp_affinity
# echo 1000 > /proc/irq/134483967/smp_affinity
got
Nov 9 21:39:51 LBSuse kernel: move irq_desc for 134483967 aka 0x8040fff to cpu 4 node 1
Nov 9 21:39:51 LBSuse kernel: alloc kstat_irqs on cpu 4 node 1
Nov 9 21:39:51 LBSuse kernel: alloc irq_cfg on cpu 4 node 1
Nov 9 21:40:05 LBSuse kernel: move irq_desc for 134483967 aka 0x8040fff to cpu 8 node 2
Nov 9 21:40:05 LBSuse kernel: alloc kstat_irqs on cpu 8 node 2
Nov 9 21:40:05 LBSuse kernel: alloc irq_cfg on cpu 8 node 2
Nov 9 21:40:18 LBSuse kernel: move irq_desc for 134483967 aka 0x8040fff to cpu 12 node 3
Nov 9 21:40:18 LBSuse kernel: alloc kstat_irqs on cpu 12 node 3
Nov 9 21:40:18 LBSuse kernel: alloc irq_cfg on cpu 12 node 3
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
arch/x86/Kconfig | 11
arch/x86/include/asm/irq_vectors.h | 2
arch/x86/kernel/i8259.c | 24 +
arch/x86/kernel/io_apic.c | 510 ++++++++++++++++++++++++++-----------
arch/x86/kernel/irq.c | 24 +
arch/x86/kernel/irq_32.c | 2
arch/x86/kernel/irq_64.c | 2
arch/x86/kernel/irqinit_32.c | 3
arch/x86/kernel/irqinit_64.c | 3
arch/x86/kernel/uv_irq.c | 22 +
arch/x86/mm/init_32.c | 3
drivers/char/random.c | 31 ++
drivers/pci/htirq.c | 19 +
drivers/pci/intr_remapping.c | 66 ++++
drivers/xen/events.c | 9
fs/proc/interrupts.c | 13
fs/proc/stat.c | 17 -
include/linux/interrupt.h | 2
include/linux/irq.h | 71 ++++-
include/linux/irqnr.h | 15 -
include/linux/kernel_stat.h | 14 -
init/main.c | 2
kernel/irq/autoprobe.c | 10
kernel/irq/chip.c | 51 ++-
kernel/irq/handle.c | 384 ++++++++++++++++++++++++++-
kernel/irq/proc.c | 3
kernel/irq/spurious.c | 4
27 files changed, 1098 insertions(+), 219 deletions(-)
Index: linux-2.6/arch/x86/Kconfig
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig
+++ linux-2.6/arch/x86/Kconfig
@@ -236,6 +236,17 @@ config X86_HAS_BOOT_CPU_ID
def_bool y
depends on X86_VOYAGER
+config SPARSE_IRQ
+ bool "Support sparse irq numbering"
+ depends on PCI_MSI || HT_IRQ
+ default y
+ help
+ This enables support for sparse irq, esp for msi/msi-x. the irq
+ number will be bus/dev/fn + 12bit. You may need if you have lots of
+ cards supports msi-x installed.
+
+ If you don't know what to do here, say Y.
+
config X86_FIND_SMP_CONFIG
def_bool y
depends on X86_MPPARSE || X86_VOYAGER
Index: linux-2.6/arch/x86/kernel/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/io_apic.c
+++ linux-2.6/arch/x86/kernel/io_apic.c
@@ -108,94 +108,220 @@ static int __init parse_noapic(char *str
early_param("noapic", parse_noapic);
struct irq_pin_list;
+
+/*
+ * This is performance-critical, we want to do it O(1)
+ *
+ * the indexing order of this array favors 1:1 mappings
+ * between pins and IRQs.
+ */
+
+struct irq_pin_list {
+ int apic, pin;
+ struct irq_pin_list *next;
+};
+
+static struct irq_pin_list *get_one_free_irq_2_pin(int cpu)
+{
+ struct irq_pin_list *pin;
+ int node;
+
+ if (cpu < 0)
+ cpu = smp_processor_id();
+ node = cpu_to_node(cpu);
+
+ pin = kzalloc_node(sizeof(*pin), GFP_KERNEL, node);
+ printk(KERN_DEBUG " alloc irq_2_pin on cpu %d node %d\n", cpu, node);
+
+ return pin;
+}
+
struct irq_cfg {
- unsigned int irq;
struct irq_pin_list *irq_2_pin;
cpumask_t domain;
cpumask_t old_domain;
unsigned move_cleanup_count;
u8 vector;
u8 move_in_progress : 1;
+#ifdef CONFIG_SPARSE_IRQ
+ u8 move_desc_in_progress_in_same_domain : 1;
+#endif
};
/* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
+#ifdef CONFIG_SPARSE_IRQ
+static struct irq_cfg irq_cfgx[] = {
+#else
static struct irq_cfg irq_cfgx[NR_IRQS] = {
- [0] = { .irq = 0, .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
- [1] = { .irq = 1, .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
- [2] = { .irq = 2, .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
- [3] = { .irq = 3, .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, },
- [4] = { .irq = 4, .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, },
- [5] = { .irq = 5, .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, },
- [6] = { .irq = 6, .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, },
- [7] = { .irq = 7, .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, },
- [8] = { .irq = 8, .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, },
- [9] = { .irq = 9, .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, },
- [10] = { .irq = 10, .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
- [11] = { .irq = 11, .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
- [12] = { .irq = 12, .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
- [13] = { .irq = 13, .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
- [14] = { .irq = 14, .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
- [15] = { .irq = 15, .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
+#endif
+ [0] = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
+ [1] = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
+ [2] = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
+ [3] = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, },
+ [4] = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, },
+ [5] = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, },
+ [6] = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, },
+ [7] = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, },
+ [8] = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, },
+ [9] = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, },
+ [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
+ [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
+ [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
+ [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
+ [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
+ [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
};
-#define for_each_irq_cfg(irq, cfg) \
- for (irq = 0, cfg = irq_cfgx; irq < nr_irqs; irq++, cfg++)
+void __init arch_early_irq_init_work(void)
+{
+ struct irq_cfg *cfg;
+ struct irq_desc *desc;
+ int count;
+ int i;
+#ifdef CONFIG_SPARSE_IRQ
+ int count_desc = NR_IRQS_LEGACY;
+#else
+ int count_desc = NR_IRQS;
+#endif
+
+ cfg = irq_cfgx;
+ count = ARRAY_SIZE(irq_cfgx);
+
+ BUG_ON(count > count_desc);
+ for (i = 0; i < count; i++) {
+ desc = irq_to_desc(i);
+ desc->chip_data = &cfg[i];
+ }
+}
+
+#ifdef CONFIG_SPARSE_IRQ
static struct irq_cfg *irq_cfg(unsigned int irq)
{
- return irq < nr_irqs ? irq_cfgx + irq : NULL;
+ struct irq_cfg *cfg = NULL;
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+ if (desc)
+ cfg = desc->chip_data;
+
+ return cfg;
}
-static struct irq_cfg *irq_cfg_alloc(unsigned int irq)
+static struct irq_cfg *get_one_free_irq_cfg(int cpu)
{
- return irq_cfg(irq);
+ struct irq_cfg *cfg;
+ int node;
+
+ if (cpu < 0)
+ cpu = smp_processor_id();
+ node = cpu_to_node(cpu);
+
+ cfg = kzalloc_node(sizeof(*cfg), GFP_KERNEL, node);
+ printk(KERN_DEBUG " alloc irq_cfg on cpu %d node %d\n", cpu, node);
+
+ return cfg;
}
-/*
- * Rough estimation of how many shared IRQs there are, can be changed
- * anytime.
- */
-#define MAX_PLUS_SHARED_IRQS NR_IRQS
-#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
+static void free_irq_cfg(struct irq_cfg *cfg)
+{
+ kfree(cfg);
+}
-/*
- * This is performance-critical, we want to do it O(1)
- *
- * the indexing order of this array favors 1:1 mappings
- * between pins and IRQs.
- */
+void arch_init_chip_data(struct irq_desc *desc, int cpu)
+{
+ struct irq_cfg *cfg;
-struct irq_pin_list {
- int apic, pin;
- struct irq_pin_list *next;
-};
+ cfg = desc->chip_data;
+ if (!cfg)
+ desc->chip_data = get_one_free_irq_cfg(cpu);
+}
-static struct irq_pin_list irq_2_pin_head[PIN_MAP_SIZE];
-static struct irq_pin_list *irq_2_pin_ptr;
+static void init_copy_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg,
+ int cpu);
-static void __init irq_2_pin_init(void)
+void arch_init_copy_chip_data(struct irq_desc *old_desc,
+ struct irq_desc *desc, int cpu)
{
- struct irq_pin_list *pin = irq_2_pin_head;
- int i;
+ struct irq_cfg *cfg;
+ struct irq_cfg *old_cfg;
- for (i = 1; i < PIN_MAP_SIZE; i++)
- pin[i-1].next = &pin[i];
+ cfg = get_one_free_irq_cfg(cpu);
+ desc->chip_data = cfg;
- irq_2_pin_ptr = &pin[0];
+ old_cfg = old_desc->chip_data;
+
+ memcpy(cfg, old_cfg, sizeof(struct irq_cfg));
+
+ init_copy_irq_2_pin(old_cfg, cfg, cpu);
+}
+
+static void free_irq_2_pin(struct irq_cfg *cfg);
+
+void arch_free_chip_data(struct irq_desc *desc)
+{
+ struct irq_cfg *cfg;
+
+ cfg = desc->chip_data;
+ if (cfg) {
+ free_irq_2_pin(cfg);
+ free_irq_cfg(cfg);
+ desc->chip_data = NULL;
+ }
}
-static struct irq_pin_list *get_one_free_irq_2_pin(void)
+static void add_pin_to_irq_cpu(struct irq_cfg *cfg, int cpu, int apic, int pin);
+
+static void init_copy_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg,
+ int cpu)
{
- struct irq_pin_list *pin = irq_2_pin_ptr;
+ struct irq_pin_list *old_entry;
- if (!pin)
- panic("can not get more irq_2_pin\n");
+ old_entry = old_cfg->irq_2_pin;
- irq_2_pin_ptr = pin->next;
- pin->next = NULL;
- return pin;
+ while (old_entry) {
+ add_pin_to_irq_cpu(cfg, cpu, old_entry->apic, old_entry->pin);
+ old_entry = old_entry->next;
+ }
}
+static void free_irq_2_pin(struct irq_cfg *cfg)
+{
+ struct irq_pin_list *entry, *next;
+
+ entry = cfg->irq_2_pin;
+
+ while (entry) {
+ next = entry->next;
+ kfree(entry);
+ entry = next;
+ }
+ cfg->irq_2_pin = NULL;
+}
+
+static void set_extra_move_desc(struct irq_desc *desc, cpumask_t mask)
+{
+ struct irq_cfg *cfg = desc->chip_data;
+
+ if (!cfg->move_in_progress) {
+ /* it means domain is not changed */
+ cpumask_t tmp;
+
+ cpus_and(tmp, desc->affinity, mask);
+ if (cpus_empty(tmp))
+ cfg->move_desc_in_progress_in_same_domain = 1;
+ }
+}
+#else
+static struct irq_cfg *irq_cfg(unsigned int irq)
+{
+ return irq < nr_irqs ? irq_cfgx + irq : NULL;
+}
+static inline void set_extra_move_desc(struct irq_desc *desc, cpumask_t mask)
+{
+}
+#endif
+
struct io_apic {
unsigned int index;
unsigned int unused[3];
@@ -359,7 +485,7 @@ static void __target_IO_APIC_irq(unsigne
}
}
-static int assign_irq_vector(int irq, cpumask_t mask);
+static int assign_irq_vector(int irq, struct irq_cfg *cfg, cpumask_t mask);
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
{
@@ -373,10 +499,13 @@ static void set_ioapic_affinity_irq(unsi
if (cpus_empty(tmp))
return;
- cfg = irq_cfg(irq);
- if (assign_irq_vector(irq, mask))
+ desc = irq_to_desc(irq);
+ cfg = desc->chip_data;
+ if (assign_irq_vector(irq, cfg, mask))
return;
+ set_extra_move_desc(desc, mask);
+
cpus_and(tmp, cfg->domain, mask);
dest = cpu_mask_to_apicid(tmp);
/*
@@ -384,7 +513,6 @@ static void set_ioapic_affinity_irq(unsi
*/
dest = SET_APIC_LOGICAL_ID(dest);
- desc = irq_to_desc(irq);
spin_lock_irqsave(&ioapic_lock, flags);
__target_IO_APIC_irq(irq, dest, cfg->vector);
desc->affinity = mask;
@@ -397,16 +525,13 @@ static void set_ioapic_affinity_irq(unsi
* shared ISA-space IRQs, so we have to support them. We are super
* fast in the common case, and fast for shared ISA-space IRQs.
*/
-static void add_pin_to_irq(unsigned int irq, int apic, int pin)
+static void add_pin_to_irq_cpu(struct irq_cfg *cfg, int cpu, int apic, int pin)
{
- struct irq_cfg *cfg;
struct irq_pin_list *entry;
- /* first time to refer irq_cfg, so with new */
- cfg = irq_cfg_alloc(irq);
entry = cfg->irq_2_pin;
if (!entry) {
- entry = get_one_free_irq_2_pin();
+ entry = get_one_free_irq_2_pin(cpu);
cfg->irq_2_pin = entry;
entry->apic = apic;
entry->pin = pin;
@@ -421,20 +546,31 @@ static void add_pin_to_irq(unsigned int
entry = entry->next;
}
- entry->next = get_one_free_irq_2_pin();
+ entry->next = get_one_free_irq_2_pin(cpu);
entry = entry->next;
entry->apic = apic;
entry->pin = pin;
}
+static void add_pin_to_irq(unsigned int irq, int apic, int pin)
+{
+ struct irq_cfg *cfg;
+ struct irq_desc *desc;
+ int cpu = smp_processor_id();
+
+ /* first time to refer irq_cfg, so with new */
+ desc = irq_to_desc_alloc_cpu(irq, cpu);
+ cfg = desc->chip_data;
+ add_pin_to_irq_cpu(cfg, cpu, apic, pin);
+}
+
/*
* Reroute an IRQ to a different pin.
*/
-static void __init replace_pin_at_irq(unsigned int irq,
+static void __init replace_pin_at_irq_cpu(struct irq_cfg *cfg, int cpu,
int oldapic, int oldpin,
int newapic, int newpin)
{
- struct irq_cfg *cfg = irq_cfg(irq);
struct irq_pin_list *entry = cfg->irq_2_pin;
int replaced = 0;
@@ -451,7 +587,7 @@ static void __init replace_pin_at_irq(un
/* why? call replace before add? */
if (!replaced)
- add_pin_to_irq(irq, newapic, newpin);
+ add_pin_to_irq_cpu(cfg, cpu, newapic, newpin);
}
static inline void io_apic_modify_irq(unsigned int irq,
@@ -809,7 +945,7 @@ EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector
*/
static int EISA_ELCR(unsigned int irq)
{
- if (irq < 16) {
+ if (irq < NR_IRQS_LEGACY) {
unsigned int port = 0x4d0 + (irq >> 3);
return (inb(port) >> (irq & 7)) & 1;
}
@@ -1034,7 +1170,7 @@ void unlock_vector_lock(void)
spin_unlock(&vector_lock);
}
-static int __assign_irq_vector(int irq, cpumask_t mask)
+static int __assign_irq_vector(int irq, struct irq_cfg *cfg, cpumask_t mask)
{
/*
* NOTE! The local APIC isn't very good at handling
@@ -1050,9 +1186,6 @@ static int __assign_irq_vector(int irq,
static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
unsigned int old_vector;
int cpu;
- struct irq_cfg *cfg;
-
- cfg = irq_cfg(irq);
/* Only try and allocate irqs on cpus that are present */
cpus_and(mask, mask, cpu_online_map);
@@ -1113,24 +1246,22 @@ next:
return -ENOSPC;
}
-static int assign_irq_vector(int irq, cpumask_t mask)
+static int assign_irq_vector(int irq, struct irq_cfg *cfg, cpumask_t mask)
{
int err;
unsigned long flags;
spin_lock_irqsave(&vector_lock, flags);
- err = __assign_irq_vector(irq, mask);
+ err = __assign_irq_vector(irq, cfg, mask);
spin_unlock_irqrestore(&vector_lock, flags);
return err;
}
-static void __clear_irq_vector(int irq)
+static void __clear_irq_vector(int irq, struct irq_cfg *cfg)
{
- struct irq_cfg *cfg;
cpumask_t mask;
int cpu, vector;
- cfg = irq_cfg(irq);
BUG_ON(!cfg->vector);
vector = cfg->vector;
@@ -1148,14 +1279,16 @@ void __setup_vector_irq(int cpu)
/* This function must be called with vector_lock held */
int irq, vector;
struct irq_cfg *cfg;
+ struct irq_desc *desc;
/* Mark the inuse vectors */
- for_each_irq_cfg(irq, cfg) {
+ for_each_irq_desc(irq, desc) {
+ cfg = desc->chip_data;
if (!cpu_isset(cpu, cfg->domain))
continue;
vector = cfg->vector;
per_cpu(vector_irq, cpu)[vector] = irq;
- }
+ } end_for_each_irq_desc();
/* Mark the free vectors */
for (vector = 0; vector < NR_VECTORS; ++vector) {
irq = per_cpu(vector_irq, cpu)[vector];
@@ -1205,7 +1338,8 @@ static void ioapic_register_intr(int irq
{
struct irq_desc *desc;
- desc = irq_to_desc(irq);
+ /* could be first time to use this irq_desc */
+ desc = irq_to_desc_alloc(irq);
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
trigger == IOAPIC_LEVEL)
@@ -1310,7 +1444,7 @@ static void setup_IO_APIC_irq(int apic,
cfg = irq_cfg(irq);
mask = TARGET_CPUS;
- if (assign_irq_vector(irq, mask))
+ if (assign_irq_vector(irq, cfg, mask))
return;
cpus_and(mask, cfg->domain, mask);
@@ -1327,12 +1461,12 @@ static void setup_IO_APIC_irq(int apic,
cfg->vector)) {
printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
mp_ioapics[apic].mp_apicid, pin);
- __clear_irq_vector(irq);
+ __clear_irq_vector(irq, cfg);
return;
}
ioapic_register_intr(irq, trigger);
- if (irq < 16)
+ if (irq < NR_IRQS_LEGACY)
disable_8259A_irq(irq);
ioapic_write_entry(apic, pin, entry);
@@ -1434,6 +1568,7 @@ __apicdebuginit(void) print_IO_APIC(void
union IO_APIC_reg_03 reg_03;
unsigned long flags;
struct irq_cfg *cfg;
+ struct irq_desc *desc;
unsigned int irq;
if (apic_verbosity == APIC_QUIET)
@@ -1523,8 +1658,10 @@ __apicdebuginit(void) print_IO_APIC(void
}
}
printk(KERN_DEBUG "IRQ to pin mappings:\n");
- for_each_irq_cfg(irq, cfg) {
- struct irq_pin_list *entry = cfg->irq_2_pin;
+ for_each_irq_desc(irq, desc) {
+ struct irq_pin_list *entry;
+ cfg = desc->chip_data;
+ entry = cfg->irq_2_pin;
if (!entry)
continue;
printk(KERN_DEBUG "IRQ%d ", irq);
@@ -1535,7 +1672,7 @@ __apicdebuginit(void) print_IO_APIC(void
entry = entry->next;
}
printk("\n");
- }
+ } end_for_each_irq_desc();
printk(KERN_INFO ".................................... done.\n");
@@ -2010,7 +2147,7 @@ static unsigned int startup_ioapic_irq(u
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
- if (irq < 16) {
+ if (irq < NR_IRQS_LEGACY) {
disable_8259A_irq(irq);
if (i8259A_irq_pending(irq))
was_pending = 1;
@@ -2095,10 +2232,10 @@ static void migrate_ioapic_irq(int irq,
if (get_irte(irq, &irte))
return;
- if (assign_irq_vector(irq, mask))
+ cfg = irq_cfg(irq);
+ if (assign_irq_vector(irq, cfg, mask))
return;
- cfg = irq_cfg(irq);
cpus_and(tmp, cfg->domain, mask);
dest = cpu_mask_to_apicid(tmp);
@@ -2178,7 +2315,7 @@ static void ir_irq_migration(struct work
desc->chip->set_affinity(irq, desc->pending_mask);
spin_unlock_irqrestore(&desc->lock, flags);
}
- }
+ } end_for_each_irq_desc();
}
/*
@@ -2236,19 +2373,40 @@ unlock:
irq_exit();
}
-static void irq_complete_move(unsigned int irq)
+static void irq_complete_move(struct irq_desc **descp)
{
- struct irq_cfg *cfg = irq_cfg(irq);
+ struct irq_desc *desc = *descp;
+ struct irq_cfg *cfg = desc->chip_data;
unsigned vector, me;
- if (likely(!cfg->move_in_progress))
+ if (likely(!cfg->move_in_progress)) {
+#ifdef CONFIG_SPARSE_IRQ
+ if (likely(!cfg->move_desc_in_progress_in_same_domain))
+ return;
+
+ /* domain is not change, but affinity is changed */
+ me = smp_processor_id();
+ if (cpu_isset(me, desc->affinity)) {
+ *descp = desc = move_irq_desc(desc, me);
+ /* get the new one */
+ cfg = desc->chip_data;
+ cfg->move_desc_in_progress_in_same_domain = 0;
+ }
+#endif
return;
+ }
vector = ~get_irq_regs()->orig_ax;
me = smp_processor_id();
if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) {
cpumask_t cleanup_mask;
+#ifdef CONFIG_SPARSE_IRQ
+ *descp = desc = move_irq_desc(desc, me);
+ /* get the new one */
+ cfg = desc->chip_data;
+#endif
+
cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
cfg->move_cleanup_count = cpus_weight(cleanup_mask);
send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
@@ -2256,41 +2414,68 @@ static void irq_complete_move(unsigned i
}
}
#else
-static inline void irq_complete_move(unsigned int irq) {}
+static inline void irq_complete_move(struct irq_desc **descp) {}
#endif
#ifdef CONFIG_INTR_REMAP
+#ifdef CONFIG_SPARSE_IRQ
+static void ack_x2apic_level(unsigned int irq, struct irq_desc **descp)
+#else
static void ack_x2apic_level(unsigned int irq)
+#endif
{
ack_x2APIC_irq();
}
+#ifdef CONFIG_SPARSE_IRQ
+static void ack_x2apic_edge(unsigned int irq, struct irq_desc **descp)
+#else
static void ack_x2apic_edge(unsigned int irq)
+#endif
{
ack_x2APIC_irq();
}
#endif
+#ifdef CONFIG_SPARSE_IRQ
+static void ack_apic_edge(unsigned int irq, struct irq_desc **descp)
+{
+ irq_complete_move(descp);
+ move_native_irq(irq);
+ ack_APIC_irq();
+}
+#else
static void ack_apic_edge(unsigned int irq)
{
- irq_complete_move(irq);
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ irq_complete_move(&desc);
move_native_irq(irq);
ack_APIC_irq();
}
+#endif
atomic_t irq_mis_count;
+#ifdef CONFIG_SPARSE_IRQ
+static void ack_apic_level(unsigned int irq, struct irq_desc **descp)
+{
+#else
static void ack_apic_level(unsigned int irq)
{
+ struct irq_desc *desc = irq_to_desc(irq);
+ struct irq_desc **descp = &desc;
+#endif
#ifdef CONFIG_X86_32
unsigned long v;
int i;
+ struct irq_cfg *cfg;
#endif
int do_unmask_irq = 0;
- irq_complete_move(irq);
+ irq_complete_move(descp);
#ifdef CONFIG_GENERIC_PENDING_IRQ
/* If we are moving the irq we need to mask it */
- if (unlikely(irq_to_desc(irq)->status & IRQ_MOVE_PENDING)) {
+ if (unlikely((*descp)->status & IRQ_MOVE_PENDING)) {
do_unmask_irq = 1;
mask_IO_APIC_irq(irq);
}
@@ -2316,7 +2501,8 @@ static void ack_apic_level(unsigned int
* operation to prevent an edge-triggered interrupt escaping meanwhile.
* The idea is from Manfred Spraul. --macro
*/
- i = irq_cfg(irq)->vector;
+ cfg = (*descp)->chip_data;
+ i = cfg->vector;
v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
#endif
@@ -2416,22 +2602,21 @@ static inline void init_IO_APIC_traps(vo
* Also, we've got to be careful not to trash gate
* 0x80, because int 0x80 is hm, kind of importantish. ;)
*/
- for_each_irq_cfg(irq, cfg) {
- if (IO_APIC_IRQ(irq) && !cfg->vector) {
+ for_each_irq_desc(irq, desc) {
+ cfg = desc->chip_data;
+ if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
/*
* Hmm.. We don't have an entry for this,
* so default to an old-fashioned 8259
* interrupt if we can..
*/
- if (irq < 16)
+ if (irq < NR_IRQS_LEGACY)
make_8259A_irq(irq);
- else {
- desc = irq_to_desc(irq);
+ else
/* Strange. Oh, well.. */
desc->chip = &no_irq_chip;
- }
}
- }
+ } end_for_each_irq_desc();
}
/*
@@ -2454,7 +2639,11 @@ static void unmask_lapic_irq(unsigned in
apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
}
+#ifdef CONFIG_SPARSE_IRQ
+static void ack_lapic_irq (unsigned int irq, struct irq_desc **descp)
+#else
static void ack_lapic_irq (unsigned int irq)
+#endif
{
ack_APIC_irq();
}
@@ -2575,6 +2764,7 @@ int timer_through_8259 __initdata;
static inline void __init check_timer(void)
{
struct irq_cfg *cfg = irq_cfg(0);
+ int cpu = smp_processor_id();
int apic1, pin1, apic2, pin2;
unsigned long flags;
unsigned int ver;
@@ -2589,7 +2779,7 @@ static inline void __init check_timer(vo
* get/set the timer IRQ vector:
*/
disable_8259A_irq(0);
- assign_irq_vector(0, TARGET_CPUS);
+ assign_irq_vector(0, cfg, TARGET_CPUS);
/*
* As IRQ0 is to be enabled in the 8259A, the virtual
@@ -2640,7 +2830,7 @@ static inline void __init check_timer(vo
* Ok, does IRQ0 through the IOAPIC work?
*/
if (no_pin1) {
- add_pin_to_irq(0, apic1, pin1);
+ add_pin_to_irq_cpu(cfg, cpu, apic1, pin1);
setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
}
unmask_IO_APIC_irq(0);
@@ -2669,7 +2859,7 @@ static inline void __init check_timer(vo
/*
* legacy devices should be connected to IO APIC #0
*/
- replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
+ replace_pin_at_irq_cpu(cfg, cpu, apic1, pin1, apic2, pin2);
setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
unmask_IO_APIC_irq(0);
enable_8259A_irq(0);
@@ -2888,22 +3078,27 @@ unsigned int create_irq_nr(unsigned int
unsigned int irq;
unsigned int new;
unsigned long flags;
- struct irq_cfg *cfg_new;
+ struct irq_cfg *cfg_new = NULL;
+ int cpu;
+ struct irq_desc *desc_new = NULL;
+#ifndef CONFIG_SPARSE_IRQ
irq_want = nr_irqs - 1;
+#endif
irq = 0;
spin_lock_irqsave(&vector_lock, flags);
+ cpu = smp_processor_id();
for (new = irq_want; new > 0; new--) {
if (platform_legacy_irq(new))
continue;
- cfg_new = irq_cfg(new);
- if (cfg_new && cfg_new->vector != 0)
+
+ desc_new = irq_to_desc_alloc_cpu(new, cpu);
+ cfg_new = desc_new->chip_data;
+
+ if (cfg_new->vector != 0)
continue;
- /* check if need to create one */
- if (!cfg_new)
- cfg_new = irq_cfg_alloc(new);
- if (__assign_irq_vector(new, TARGET_CPUS) == 0)
+ if (__assign_irq_vector(new, cfg_new, TARGET_CPUS) == 0)
irq = new;
break;
}
@@ -2911,6 +3106,9 @@ unsigned int create_irq_nr(unsigned int
if (irq > 0) {
dynamic_irq_init(irq);
+ /* restore it, in case dynamic_irq_init clear it */
+ if (desc_new)
+ desc_new->chip_data = cfg_new;
}
return irq;
}
@@ -2930,14 +3128,22 @@ int create_irq(void)
void destroy_irq(unsigned int irq)
{
unsigned long flags;
+ struct irq_cfg *cfg;
+ struct irq_desc *desc;
+ /* store it, in case dynamic_irq_cleanup clear it */
+ desc = irq_to_desc(irq);
+ cfg = desc->chip_data;
dynamic_irq_cleanup(irq);
+ /* connect back irq_cfg */
+ if (desc)
+ desc->chip_data = cfg;
#ifdef CONFIG_INTR_REMAP
free_irte(irq);
#endif
spin_lock_irqsave(&vector_lock, flags);
- __clear_irq_vector(irq);
+ __clear_irq_vector(irq, cfg);
spin_unlock_irqrestore(&vector_lock, flags);
}
@@ -2952,12 +3158,12 @@ static int msi_compose_msg(struct pci_de
unsigned dest;
cpumask_t tmp;
+ cfg = irq_cfg(irq);
tmp = TARGET_CPUS;
- err = assign_irq_vector(irq, tmp);
+ err = assign_irq_vector(irq, cfg, tmp);
if (err)
return err;
- cfg = irq_cfg(irq);
cpus_and(tmp, cfg->domain, tmp);
dest = cpu_mask_to_apicid(tmp);
@@ -3025,10 +3231,13 @@ static void set_msi_irq_affinity(unsigne
if (cpus_empty(tmp))
return;
- if (assign_irq_vector(irq, mask))
+ desc = irq_to_desc(irq);
+ cfg = desc->chip_data;
+ if (assign_irq_vector(irq, cfg, mask))
return;
- cfg = irq_cfg(irq);
+ set_extra_move_desc(desc, mask);
+
cpus_and(tmp, cfg->domain, mask);
dest = cpu_mask_to_apicid(tmp);
@@ -3040,7 +3249,6 @@ static void set_msi_irq_affinity(unsigne
msg.address_lo |= MSI_ADDR_DEST_ID(dest);
write_msi_msg(irq, &msg);
- desc = irq_to_desc(irq);
desc->affinity = mask;
}
@@ -3064,10 +3272,13 @@ static void ir_set_msi_irq_affinity(unsi
if (get_irte(irq, &irte))
return;
- if (assign_irq_vector(irq, mask))
+ desc = irq_to_desc(irq);
+ cfg = desc->chip_data;
+ if (assign_irq_vector(irq, cfg, mask))
return;
- cfg = irq_cfg(irq);
+ set_extra_move_desc(desc, mask);
+
cpus_and(tmp, cfg->domain, mask);
dest = cpu_mask_to_apicid(tmp);
@@ -3091,7 +3302,6 @@ static void ir_set_msi_irq_affinity(unsi
cfg->move_in_progress = 0;
}
- desc = irq_to_desc(irq);
desc->affinity = mask;
}
#endif
@@ -3176,7 +3386,7 @@ static int setup_msi_irq(struct pci_dev
#endif
set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
- dev_printk(KERN_DEBUG, &dev->dev, "irq %d for MSI/MSI-X\n", irq);
+ dev_printk(KERN_DEBUG, &dev->dev, "irq %d aka 0x%08x for MSI/MSI-X\n", irq, irq);
return 0;
}
@@ -3185,6 +3395,7 @@ static unsigned int build_irq_for_pci_de
{
unsigned int irq;
+ /* use 8bits (bus) + 8bits (devfn) + 12 bits */
irq = dev->bus->number;
irq <<= 8;
irq |= dev->devfn;
@@ -3199,7 +3410,7 @@ int arch_setup_msi_irq(struct pci_dev *d
int ret;
unsigned int irq_want;
- irq_want = build_irq_for_pci_dev(dev) + 0x100;
+ irq_want = build_irq_for_pci_dev(dev) + 0xfff;
irq = create_irq_nr(irq_want);
if (irq == 0)
@@ -3240,7 +3451,8 @@ int arch_setup_msi_irqs(struct pci_dev *
int index = 0;
#endif
- irq_want = build_irq_for_pci_dev(dev) + 0x100;
+ /* count from the top 0xfff in 12 bits range */
+ irq_want = build_irq_for_pci_dev(dev) + 0xfff;
sub_handle = 0;
list_for_each_entry(desc, &dev->msi_list, list) {
irq = create_irq_nr(irq_want--);
@@ -3306,10 +3518,13 @@ static void dmar_msi_set_affinity(unsign
if (cpus_empty(tmp))
return;
- if (assign_irq_vector(irq, mask))
+ desc = irq_to_desc(irq);
+ cfg = desc->chip_data;
+ if (assign_irq_vector(irq, cfg, mask))
return;
- cfg = irq_cfg(irq);
+ set_extra_move_desc(desc, mask);
+
cpus_and(tmp, cfg->domain, mask);
dest = cpu_mask_to_apicid(tmp);
@@ -3321,7 +3536,6 @@ static void dmar_msi_set_affinity(unsign
msg.address_lo |= MSI_ADDR_DEST_ID(dest);
dmar_msi_write(irq, &msg);
- desc = irq_to_desc(irq);
desc->affinity = mask;
}
#endif /* CONFIG_SMP */
@@ -3367,10 +3581,13 @@ static void hpet_msi_set_affinity(unsign
if (cpus_empty(tmp))
return;
- if (assign_irq_vector(irq, mask))
+ desc = irq_to_desc(irq);
+ cfg = desc->chip_data;
+ if (assign_irq_vector(irq, cfg, mask))
return;
- cfg = irq_cfg(irq);
+ set_extra_move_desc(desc, mask);
+
cpus_and(tmp, cfg->domain, mask);
dest = cpu_mask_to_apicid(tmp);
@@ -3382,7 +3599,6 @@ static void hpet_msi_set_affinity(unsign
msg.address_lo |= MSI_ADDR_DEST_ID(dest);
hpet_msi_write(irq, &msg);
- desc = irq_to_desc(irq);
desc->affinity = mask;
}
#endif /* CONFIG_SMP */
@@ -3448,15 +3664,17 @@ static void set_ht_irq_affinity(unsigned
if (cpus_empty(tmp))
return;
- if (assign_irq_vector(irq, mask))
+ desc = irq_to_desc(irq);
+ cfg = desc->chip_data;
+ if (assign_irq_vector(irq, cfg, mask))
return;
- cfg = irq_cfg(irq);
+ set_extra_move_desc(desc, mask);
+
cpus_and(tmp, cfg->domain, mask);
dest = cpu_mask_to_apicid(tmp);
target_ht_irq(irq, dest, cfg->vector);
- desc = irq_to_desc(irq);
desc->affinity = mask;
}
#endif
@@ -3478,13 +3696,13 @@ int arch_setup_ht_irq(unsigned int irq,
int err;
cpumask_t tmp;
+ cfg = irq_cfg(irq);
tmp = TARGET_CPUS;
- err = assign_irq_vector(irq, tmp);
+ err = assign_irq_vector(irq, cfg, tmp);
if (!err) {
struct ht_irq_msg msg;
unsigned dest;
- cfg = irq_cfg(irq);
cpus_and(tmp, cfg->domain, tmp);
dest = cpu_mask_to_apicid(tmp);
@@ -3508,7 +3726,8 @@ int arch_setup_ht_irq(unsigned int irq,
set_irq_chip_and_handler_name(irq, &ht_irq_chip,
handle_edge_irq, "edge");
- dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
+ dev_printk(KERN_DEBUG, &dev->dev, "irq %d aka 0x%08x for HT\n",
+ irq, irq);
}
return err;
}
@@ -3530,7 +3749,9 @@ int arch_enable_uv_irq(char *irq_name, u
unsigned long flags;
int err;
- err = assign_irq_vector(irq, *eligible_cpu);
+ cfg = irq_cfg(irq);
+
+ err = assign_irq_vector(irq, cfg, *eligible_cpu);
if (err != 0)
return err;
@@ -3539,8 +3760,6 @@ int arch_enable_uv_irq(char *irq_name, u
irq_name);
spin_unlock_irqrestore(&vector_lock, flags);
- cfg = irq_cfg(irq);
-
mmr_value = 0;
entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long));
@@ -3594,6 +3813,7 @@ int __init io_apic_get_redir_entries (in
int __init probe_nr_irqs(void)
{
+#ifdef CONFIG_SPARSE_IRQ
int idx;
int nr = 0;
#ifndef CONFIG_XEN
@@ -3611,10 +3831,11 @@ int __init probe_nr_irqs(void)
/* something wrong ? */
if (nr < nr_min)
nr = nr_min;
- if (WARN_ON(nr > NR_IRQS))
- nr = NR_IRQS;
return nr;
+#else
+ return NR_IRQS;
+#endif
}
/* --------------------------------------------------------------------------
@@ -3722,7 +3943,7 @@ int io_apic_set_pci_routing (int ioapic,
/*
* IRQs < 16 are already in the irq_2_pin[] map
*/
- if (irq >= 16)
+ if (irq >= NR_IRQS_LEGACY)
add_pin_to_irq(irq, ioapic, pin);
setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
@@ -3852,7 +4073,6 @@ void __init ioapic_init_mappings(void)
struct resource *ioapic_res;
int i;
- irq_2_pin_init();
ioapic_res = ioapic_setup_resources();
for (i = 0; i < nr_ioapics; i++) {
if (smp_found_config) {
Index: linux-2.6/arch/x86/kernel/irqinit_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/irqinit_32.c
+++ linux-2.6/arch/x86/kernel/irqinit_32.c
@@ -68,8 +68,7 @@ void __init init_ISA_irqs (void)
/*
* 16 old-style INTA-cycle interrupts:
*/
- for (i = 0; i < 16; i++) {
- /* first time call this irq_desc */
+ for (i = 0; i < NR_IRQS_LEGACY; i++) {
struct irq_desc *desc = irq_to_desc(i);
desc->status = IRQ_DISABLED;
Index: linux-2.6/arch/x86/kernel/irqinit_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/irqinit_64.c
+++ linux-2.6/arch/x86/kernel/irqinit_64.c
@@ -142,8 +142,7 @@ void __init init_ISA_irqs(void)
init_bsp_APIC();
init_8259A(0);
- for (i = 0; i < 16; i++) {
- /* first time call this irq_desc */
+ for (i = 0; i < NR_IRQS_LEGACY; i++) {
struct irq_desc *desc = irq_to_desc(i);
desc->status = IRQ_DISABLED;
Index: linux-2.6/arch/x86/mm/init_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_32.c
+++ linux-2.6/arch/x86/mm/init_32.c
@@ -66,6 +66,7 @@ static unsigned long __meminitdata table
static unsigned long __meminitdata table_top;
static int __initdata after_init_bootmem;
+int after_bootmem;
static __init void *alloc_low_page(unsigned long *phys)
{
@@ -987,6 +988,8 @@ void __init mem_init(void)
set_highmem_pages_init();
+ after_bootmem = 1;
+
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
Index: linux-2.6/drivers/char/random.c
===================================================================
--- linux-2.6.orig/drivers/char/random.c
+++ linux-2.6/drivers/char/random.c
@@ -558,6 +558,8 @@ struct timer_rand_state {
unsigned dont_count_entropy:1;
};
+#ifndef CONFIG_SPARSE_IRQ
+
static struct timer_rand_state *irq_timer_state[NR_IRQS];
static struct timer_rand_state *get_timer_rand_state(unsigned int irq)
@@ -576,6 +578,33 @@ static void set_timer_rand_state(unsigne
irq_timer_state[irq] = state;
}
+#else
+
+static struct timer_rand_state *get_timer_rand_state(unsigned int irq)
+{
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+
+ if (!desc)
+ return NULL;
+
+ return desc->timer_rand_state;
+}
+
+static void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
+{
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+
+ if (!desc)
+ return;
+
+ desc->timer_rand_state = state;
+}
+#endif
+
static struct timer_rand_state input_timer_state;
/*
@@ -933,8 +962,10 @@ void rand_initialize_irq(int irq)
{
struct timer_rand_state *state;
+#ifndef CONFIG_SPARSE_IRQ
if (irq >= nr_irqs)
return;
+#endif
state = get_timer_rand_state(irq);
Index: linux-2.6/drivers/pci/htirq.c
===================================================================
--- linux-2.6.orig/drivers/pci/htirq.c
+++ linux-2.6/drivers/pci/htirq.c
@@ -82,6 +82,19 @@ void unmask_ht_irq(unsigned int irq)
write_ht_irq_msg(irq, &msg);
}
+static unsigned int build_irq_for_pci_dev(struct pci_dev *dev)
+{
+ unsigned int irq;
+
+ /* use 8bits (bus) + 8bits (devfn) + 12 bits */
+ irq = dev->bus->number;
+ irq <<= 8;
+ irq |= dev->devfn;
+ irq <<= 12;
+
+ return irq;
+}
+
/**
* __ht_create_irq - create an irq and attach it to a device.
* @dev: The hypertransport device to find the irq capability on.
@@ -98,6 +111,7 @@ int __ht_create_irq(struct pci_dev *dev,
int max_irq;
int pos;
int irq;
+ unsigned int irq_want;
pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ);
if (!pos)
@@ -125,7 +139,12 @@ int __ht_create_irq(struct pci_dev *dev,
cfg->msg.address_lo = 0xffffffff;
cfg->msg.address_hi = 0xffffffff;
+ irq_want = build_irq_for_pci_dev(dev);
+#ifdef CONFIG_SPARSE_IRQ
+ irq = create_irq_nr(irq_want + idx);
+#else
irq = create_irq();
+#endif
if (irq <= 0) {
kfree(cfg);
Index: linux-2.6/drivers/pci/intr_remapping.c
===================================================================
--- linux-2.6.orig/drivers/pci/intr_remapping.c
+++ linux-2.6/drivers/pci/intr_remapping.c
@@ -19,17 +19,77 @@ struct irq_2_iommu {
u8 irte_mask;
};
-static struct irq_2_iommu irq_2_iommuX[NR_IRQS];
+#ifdef CONFIG_SPARSE_IRQ
+static struct irq_2_iommu *get_one_free_irq_2_iommu(int cpu)
+{
+ struct irq_2_iommu *iommu;
+ int node;
+
+ if (cpu < 0)
+ cpu = smp_processor_id();
+ node = cpu_to_node(cpu);
+
+ iommu = kzalloc_node(sizeof(*iommu), GFP_KERNEL, node);
+ printk(KERN_DEBUG "alloc irq_2_iommu on cpu %d node %d\n", cpu, node);
+
+ return iommu;
+}
static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
{
- return (irq < nr_irqs) ? irq_2_iommuX + irq : NULL;
+ struct irq_desc *desc;
+
+ desc = irq_to_desc(irq);
+
+ if (WARN_ON_ONCE(!desc))
+ return NULL;
+
+ return desc->irq_2_iommu;
+}
+
+static struct irq_2_iommu *irq_2_iommu_alloc_cpu(unsigned int irq, int cpu)
+{
+ struct irq_desc *desc;
+ struct irq_2_iommu *irq_iommu;
+
+ /*
+ * alloc irq desc if not allocated already.
+ */
+ desc = irq_to_desc_alloc_cpu(irq, cpu);
+
+ irq_iommu = desc->irq_2_iommu;
+
+ if (!irq_iommu)
+ desc->irq_2_iommu = get_one_free_irq_2_iommu(cpu);
+
+ return desc->irq_2_iommu;
+}
+
+static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
+{
+ return irq_2_iommu_alloc_cpu(irq, -1);
}
+#else /* !CONFIG_SPARSE_IRQ */
+
+static struct irq_2_iommu irq_2_iommuX[NR_IRQS];
+
+static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
+{
+ if (irq < nr_irqs)
+ return &irq_2_iommuX[irq];
+
+ return NULL;
+}
+static struct irq_2_iommu *irq_2_iommu_alloc_cpu(unsigned int irq, int cpu)
+{
+ return irq_2_iommu(irq);
+}
static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
{
return irq_2_iommu(irq);
}
+#endif
static DEFINE_SPINLOCK(irq_2_ir_lock);
@@ -86,9 +146,11 @@ int alloc_irte(struct intel_iommu *iommu
if (!count)
return -1;
+#ifndef CONFIG_SPARSE_IRQ
/* protect irq_2_iommu_alloc later */
if (irq >= nr_irqs)
return -1;
+#endif
/*
* start the IRTE search from index 0.
Index: linux-2.6/drivers/xen/events.c
===================================================================
--- linux-2.6.orig/drivers/xen/events.c
+++ linux-2.6/drivers/xen/events.c
@@ -141,8 +141,9 @@ static void init_evtchn_cpu_bindings(voi
int i;
/* By default all event channels notify CPU#0. */
- for_each_irq_desc(i, desc)
+ for_each_irq_desc(i, desc) {
desc->affinity = cpumask_of_cpu(0);
+ } end_for_each_irq_desc();
#endif
memset(cpu_evtchn, 0, sizeof(cpu_evtchn));
@@ -231,7 +232,7 @@ static int find_unbound_irq(void)
int irq;
/* Only allocate from dynirq range */
- for_each_irq_nr(irq)
+ for (irq = 0; irq < nr_irqs; irq++)
if (irq_bindcount[irq] == 0)
break;
@@ -792,7 +793,7 @@ void xen_irq_resume(void)
mask_evtchn(evtchn);
/* No IRQ <-> event-channel mappings. */
- for_each_irq_nr(irq)
+ for (irq = 0; irq < nr_irqs; irq++)
irq_info[irq].evtchn = 0; /* zap event-channel binding */
for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
@@ -824,7 +825,7 @@ void __init xen_init_IRQ(void)
mask_evtchn(i);
/* Dynamic IRQ space is currently unbound. Zero the refcnts. */
- for_each_irq_nr(i)
+ for (i = 0; i < nr_irqs; i++)
irq_bindcount[i] = 0;
irq_ctx_init(smp_processor_id());
Index: linux-2.6/fs/proc/stat.c
===================================================================
--- linux-2.6.orig/fs/proc/stat.c
+++ linux-2.6/fs/proc/stat.c
@@ -27,6 +27,9 @@ static int show_stat(struct seq_file *p,
u64 sum = 0;
struct timespec boottime;
unsigned int per_irq_sum;
+#ifdef CONFIG_GENERIC_HARDIRQS
+ struct irq_desc *desc;
+#endif
user = nice = system = idle = iowait =
irq = softirq = steal = cputime64_zero;
@@ -44,10 +47,9 @@ static int show_stat(struct seq_file *p,
softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
-
- for_each_irq_nr(j)
+ for_each_irq_desc(j, desc) {
sum += kstat_irqs_cpu(j, i);
-
+ } end_for_each_irq_desc();
sum += arch_irq_stat_cpu(i);
}
sum += arch_irq_stat();
@@ -90,14 +92,17 @@ static int show_stat(struct seq_file *p,
seq_printf(p, "intr %llu", (unsigned long long)sum);
/* sum again ? it could be updated? */
- for_each_irq_nr(j) {
+ for_each_irq_desc(j, desc) {
per_irq_sum = 0;
-
for_each_possible_cpu(i)
per_irq_sum += kstat_irqs_cpu(j, i);
+#ifdef CONFIG_SPARSE_IRQ
+ seq_printf(p, " %#x:%u", j, per_irq_sum);
+#else
seq_printf(p, " %u", per_irq_sum);
- }
+#endif
+ } end_for_each_irq_desc();
seq_printf(p,
"\nctxt %llu\n"
Index: linux-2.6/fs/proc/interrupts.c
===================================================================
--- linux-2.6.orig/fs/proc/interrupts.c
+++ linux-2.6/fs/proc/interrupts.c
@@ -10,20 +10,31 @@
*/
static void *int_seq_start(struct seq_file *f, loff_t *pos)
{
+#ifdef CONFIG_SPARSE_IRQ
+ rcu_read_lock();
+ return seq_list_start(&sparse_irqs_head, *pos);
+#else
return (*pos <= nr_irqs) ? pos : NULL;
+#endif
}
static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
{
+#ifdef CONFIG_SPARSE_IRQ
+ return seq_list_next(v, &sparse_irqs_head, pos);
+#else
(*pos)++;
if (*pos > nr_irqs)
return NULL;
return pos;
+#endif
}
static void int_seq_stop(struct seq_file *f, void *v)
{
- /* Nothing to do */
+#ifdef CONFIG_SPARSE_IRQ
+ rcu_read_unlock();
+#endif
}
static const struct seq_operations int_seq_ops = {
Index: linux-2.6/include/linux/interrupt.h
===================================================================
--- linux-2.6.orig/include/linux/interrupt.h
+++ linux-2.6/include/linux/interrupt.h
@@ -18,6 +18,8 @@
#include <asm/ptrace.h>
#include <asm/system.h>
+extern int nr_irqs;
+
/*
* These correspond to the IORESOURCE_IRQ_* defines in
* linux/ioport.h to select the interrupt line behaviour. When
Index: linux-2.6/include/linux/irq.h
===================================================================
--- linux-2.6.orig/include/linux/irq.h
+++ linux-2.6/include/linux/irq.h
@@ -106,11 +106,17 @@ struct irq_chip {
void (*enable)(unsigned int irq);
void (*disable)(unsigned int irq);
- void (*ack)(unsigned int irq);
void (*mask)(unsigned int irq);
- void (*mask_ack)(unsigned int irq);
void (*unmask)(unsigned int irq);
+#ifdef CONFIG_SPARSE_IRQ
+ void (*ack)(unsigned int irq, struct irq_desc **descp);
+ void (*mask_ack)(unsigned int irq, struct irq_desc **descp);
+ void (*eoi)(unsigned int irq, struct irq_desc **descp);
+#else
+ void (*ack)(unsigned int irq);
+ void (*mask_ack)(unsigned int irq);
void (*eoi)(unsigned int irq);
+#endif
void (*end)(unsigned int irq);
void (*set_affinity)(unsigned int irq, cpumask_t dest);
@@ -129,6 +135,8 @@ struct irq_chip {
const char *typename;
};
+struct timer_rand_state;
+struct irq_2_iommu;
/**
* struct irq_desc - interrupt descriptor
*
@@ -155,6 +163,15 @@ struct irq_chip {
*/
struct irq_desc {
unsigned int irq;
+#ifdef CONFIG_SPARSE_IRQ
+ struct list_head list;
+ struct list_head hash_entry;
+ struct timer_rand_state *timer_rand_state;
+ unsigned int *kstat_irqs;
+# ifdef CONFIG_INTR_REMAP
+ struct irq_2_iommu *irq_2_iommu;
+# endif
+#endif
irq_flow_handler_t handle_irq;
struct irq_chip *chip;
struct msi_desc *msi_desc;
@@ -182,14 +199,60 @@ struct irq_desc {
const char *name;
} ____cacheline_internodealigned_in_smp;
+extern struct irq_desc *irq_to_desc(unsigned int irq);
+extern struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu);
+extern struct irq_desc *irq_to_desc_alloc(unsigned int irq);
+extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu);
+extern void arch_early_irq_init_work(void);
+extern void arch_init_chip_data(struct irq_desc *desc, int cpu);
+extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
+ struct irq_desc *desc, int cpu);
+extern void arch_free_chip_data(struct irq_desc *desc);
+
+#ifndef CONFIG_SPARSE_IRQ
+/* could be removed if we get rid of all irq_desc reference */
extern struct irq_desc irq_desc[NR_IRQS];
-static inline struct irq_desc *irq_to_desc(unsigned int irq)
+#ifdef CONFIG_GENERIC_HARDIRQS
+# define for_each_irq_desc(irq, desc) \
+ for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
+# define for_each_irq_desc_reverse(irq, desc) \
+ for (irq = nr_irqs - 1, desc = irq_desc + (nr_irqs - 1); \
+ irq >= 0; irq--, desc--)
+
+#define end_for_each_irq_desc()
+#endif
+
+static inline void early_irq_init_work(void)
{
- return (irq < nr_irqs) ? irq_desc + irq : NULL;
+ arch_early_irq_init_work();
}
+#else
+
+void early_irq_init_work(void);
+extern struct list_head sparse_irqs_head;
+#define for_each_irq_desc(irqX, desc) \
+ rcu_read_lock(); \
+ for (desc = list_entry(rcu_dereference(sparse_irqs_head.next), typeof(*desc), list), irqX = desc->irq; \
+ prefetch(desc->list.next), &desc->list != &sparse_irqs_head; \
+ desc = list_entry(rcu_dereference(desc->list.next), typeof(*desc), list), irqX = desc ? desc->irq : -1U)
+
+#define for_each_irq_desc_reverse(irqX, desc) \
+ rcu_read_lock(); \
+ for (desc = list_entry(rcu_dereference(sparse_irqs_head.prev), typeof(*desc), list), irqX = desc->irq; \
+ prefetch(desc->list.prev), &desc->list != &sparse_irqs_head; \
+ desc = list_entry(rcu_dereference(desc->list.prev), typeof(*desc), list), irqX = desc ? desc->irq : -1U)
+
+#define end_for_each_irq_desc() rcu_read_unlock()
+
+#define kstat_irqs_this_cpu(DESC) \
+ ((DESC)->kstat_irqs[smp_processor_id()])
+#define kstat_incr_irqs_this_cpu(irqno, DESC) \
+ ((DESC)->kstat_irqs[smp_processor_id()]++)
+#endif
+
/*
* Migration helpers for obsolete names, they will go away:
*/
Index: linux-2.6/include/linux/kernel_stat.h
===================================================================
--- linux-2.6.orig/include/linux/kernel_stat.h
+++ linux-2.6/include/linux/kernel_stat.h
@@ -28,7 +28,9 @@ struct cpu_usage_stat {
struct kernel_stat {
struct cpu_usage_stat cpustat;
- unsigned int irqs[NR_IRQS];
+#ifndef CONFIG_SPARSE_IRQ
+ unsigned int irqs[NR_IRQS];
+#endif
};
DECLARE_PER_CPU(struct kernel_stat, kstat);
@@ -39,6 +41,10 @@ DECLARE_PER_CPU(struct kernel_stat, ksta
extern unsigned long long nr_context_switches(void);
+#ifndef CONFIG_SPARSE_IRQ
+#define kstat_irqs_this_cpu(irq) \
+ (kstat_this_cpu.irqs[irq])
+
struct irq_desc;
static inline void kstat_incr_irqs_this_cpu(unsigned int irq,
@@ -46,11 +52,17 @@ static inline void kstat_incr_irqs_this_
{
kstat_this_cpu.irqs[irq]++;
}
+#endif
+
+#ifndef CONFIG_SPARSE_IRQ
static inline unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
{
return kstat_cpu(cpu).irqs[irq];
}
+#else
+extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);
+#endif
/*
* Number of interrupts per specific IRQ source, since bootup
Index: linux-2.6/kernel/irq/autoprobe.c
===================================================================
--- linux-2.6.orig/kernel/irq/autoprobe.c
+++ linux-2.6/kernel/irq/autoprobe.c
@@ -57,7 +57,7 @@ unsigned long probe_irq_on(void)
desc->chip->startup(i);
}
spin_unlock_irq(&desc->lock);
- }
+ } end_for_each_irq_desc();
/* Wait for longstanding interrupts to trigger. */
msleep(20);
@@ -75,7 +75,7 @@ unsigned long probe_irq_on(void)
desc->status |= IRQ_PENDING;
}
spin_unlock_irq(&desc->lock);
- }
+ } end_for_each_irq_desc();
/*
* Wait for spurious interrupts to trigger
@@ -99,7 +99,7 @@ unsigned long probe_irq_on(void)
mask |= 1 << i;
}
spin_unlock_irq(&desc->lock);
- }
+ } end_for_each_irq_desc();
return mask;
}
@@ -135,7 +135,7 @@ unsigned int probe_irq_mask(unsigned lon
desc->chip->shutdown(i);
}
spin_unlock_irq(&desc->lock);
- }
+ } end_for_each_irq_desc();
mutex_unlock(&probing_active);
return mask & val;
@@ -179,7 +179,7 @@ int probe_irq_off(unsigned long val)
desc->chip->shutdown(i);
}
spin_unlock_irq(&desc->lock);
- }
+ } end_for_each_irq_desc();
mutex_unlock(&probing_active);
if (nr_of_irqs > 1)
Index: linux-2.6/kernel/irq/chip.c
===================================================================
--- linux-2.6.orig/kernel/irq/chip.c
+++ linux-2.6/kernel/irq/chip.c
@@ -24,9 +24,11 @@
*/
void dynamic_irq_init(unsigned int irq)
{
- struct irq_desc *desc = irq_to_desc(irq);
+ struct irq_desc *desc;
unsigned long flags;
+ /* first time to use this irq_desc */
+ desc = irq_to_desc_alloc(irq);
if (!desc) {
WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
return;
@@ -282,13 +284,23 @@ void irq_chip_set_defaults(struct irq_ch
chip->end = dummy_irq_chip.end;
}
-static inline void mask_ack_irq(struct irq_desc *desc, int irq)
+static inline void mask_ack_irq(struct irq_desc **descp, int irq)
{
- if (desc->chip->mask_ack)
+ struct irq_desc *desc = *descp;
+
+ if (desc->chip->mask_ack) {
+#ifdef CONFIG_SPARSE_IRQ
+ desc->chip->mask_ack(irq, descp);
+#else
desc->chip->mask_ack(irq);
- else {
+#endif
+ } else {
desc->chip->mask(irq);
+#ifdef CONFIG_SPARSE_IRQ
+ desc->chip->ack(irq, descp);
+#else
desc->chip->ack(irq);
+#endif
}
}
@@ -351,7 +363,7 @@ handle_level_irq(unsigned int irq, struc
irqreturn_t action_ret;
spin_lock(&desc->lock);
- mask_ack_irq(desc, irq);
+ mask_ack_irq(&desc, irq);
if (unlikely(desc->status & IRQ_INPROGRESS))
goto out_unlock;
@@ -428,7 +440,11 @@ handle_fasteoi_irq(unsigned int irq, str
spin_lock(&desc->lock);
desc->status &= ~IRQ_INPROGRESS;
out:
+#ifdef CONFIG_SPARSE_IRQ
+ desc->chip->eoi(irq, &desc);
+#else
desc->chip->eoi(irq);
+#endif
spin_unlock(&desc->lock);
}
@@ -464,13 +480,17 @@ handle_edge_irq(unsigned int irq, struct
if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) ||
!desc->action)) {
desc->status |= (IRQ_PENDING | IRQ_MASKED);
- mask_ack_irq(desc, irq);
+ mask_ack_irq(&desc, irq);
goto out_unlock;
}
kstat_incr_irqs_this_cpu(irq, desc);
/* Start handling the irq */
+#ifdef CONFIG_SPARSE_IRQ
+ desc->chip->ack(irq, &desc);
+#else
desc->chip->ack(irq);
+#endif
/* Mark the IRQ currently in progress.*/
desc->status |= IRQ_INPROGRESS;
@@ -524,15 +544,25 @@ handle_percpu_irq(unsigned int irq, stru
kstat_incr_irqs_this_cpu(irq, desc);
- if (desc->chip->ack)
+ if (desc->chip->ack) {
+#ifdef CONFIG_SPARSE_IRQ
+ desc->chip->ack(irq, &desc);
+#else
desc->chip->ack(irq);
+#endif
+ }
action_ret = handle_IRQ_event(irq, desc->action);
if (!noirqdebug)
note_interrupt(irq, desc, action_ret);
- if (desc->chip->eoi)
+ if (desc->chip->eoi) {
+#ifdef CONFIG_SPARSE_IRQ
+ desc->chip->eoi(irq, &desc);
+#else
desc->chip->eoi(irq);
+#endif
+ }
}
void
@@ -567,8 +597,9 @@ __set_irq_handler(unsigned int irq, irq_
/* Uninstall? */
if (handle == handle_bad_irq) {
- if (desc->chip != &no_irq_chip)
- mask_ack_irq(desc, irq);
+ if (desc->chip != &no_irq_chip) {
+ mask_ack_irq(&desc, irq);
+ }
desc->status |= IRQ_DISABLED;
desc->depth = 1;
}
Index: linux-2.6/kernel/irq/handle.c
===================================================================
--- linux-2.6.orig/kernel/irq/handle.c
+++ linux-2.6/kernel/irq/handle.c
@@ -15,9 +15,16 @@
#include <linux/random.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
+#include <linux/rculist.h>
+#include <linux/hash.h>
#include "internals.h"
+/*
+ * lockdep: we want to handle all irq_desc locks as a single lock-class:
+ */
+static struct lock_class_key irq_desc_lock_class;
+
/**
* handle_bad_irq - handle spurious and unhandled irqs
* @irq: the interrupt number
@@ -49,6 +56,299 @@ void handle_bad_irq(unsigned int irq, st
int nr_irqs = NR_IRQS;
EXPORT_SYMBOL_GPL(nr_irqs);
+#ifdef CONFIG_SPARSE_IRQ
+static struct irq_desc irq_desc_init = {
+ .irq = -1U,
+ .status = IRQ_DISABLED,
+ .chip = &no_irq_chip,
+ .handle_irq = handle_bad_irq,
+ .depth = 1,
+ .lock = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
+#ifdef CONFIG_SMP
+ .affinity = CPU_MASK_ALL
+#endif
+};
+
+static void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
+{
+ unsigned long bytes;
+ char *ptr;
+ int node;
+
+ /* Compute how many bytes we need per irq and allocate them */
+ bytes = nr * sizeof(unsigned int);
+
+ if (cpu < 0)
+ cpu = smp_processor_id();
+
+ node = cpu_to_node(cpu);
+ ptr = kzalloc_node(bytes, GFP_KERNEL, node);
+ printk(KERN_DEBUG " alloc kstat_irqs on cpu %d node %d\n", cpu, node);
+
+ desc->kstat_irqs = (unsigned int *)ptr;
+}
+
+#ifdef CONFIG_SMP
+static void init_copy_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc,
+ int cpu, int nr)
+{
+ unsigned long bytes;
+
+ init_kstat_irqs(desc, cpu, nr);
+
+ /* Compute how many bytes we need per irq and allocate them */
+ bytes = nr * sizeof(unsigned int);
+
+ memcpy(desc->kstat_irqs, old_desc->kstat_irqs, bytes);
+}
+
+static void free_kstat_irqs(struct irq_desc *desc)
+{
+ kfree(desc->kstat_irqs);
+ desc->kstat_irqs = NULL;
+}
+#endif
+
+void __attribute__((weak)) arch_init_chip_data(struct irq_desc *desc, int cpu)
+{
+}
+
+static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
+{
+ memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
+ desc->irq = irq;
+#ifdef CONFIG_SMP
+ desc->cpu = cpu;
+#endif
+ lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+ init_kstat_irqs(desc, cpu, nr_cpu_ids);
+ arch_init_chip_data(desc, cpu);
+}
+
+#ifdef CONFIG_SMP
+static void init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
+ struct irq_desc *desc, int cpu)
+{
+ memcpy(desc, old_desc, sizeof(struct irq_desc));
+ desc->cpu = cpu;
+ lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+ init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
+ arch_init_copy_chip_data(old_desc, desc, cpu);
+}
+
+static void free_one_irq_desc(struct irq_desc *desc)
+{
+ free_kstat_irqs(desc);
+ arch_free_chip_data(desc);
+}
+#endif
+/*
+ * Protect the sparse_irqs_free freelist:
+ */
+static DEFINE_SPINLOCK(sparse_irq_lock);
+LIST_HEAD(sparse_irqs_head);
+
+/*
+ * The sparse irqs are in a hash-table as well, for fast lookup:
+ */
+#define SPARSEIRQHASH_BITS (13 - 1)
+#define SPARSEIRQHASH_SIZE (1UL << SPARSEIRQHASH_BITS)
+#define __sparseirqhashfn(key) hash_long((unsigned long)key, SPARSEIRQHASH_BITS)
+#define sparseirqhashentry(key) (sparseirqhash_table + __sparseirqhashfn((key)))
+
+static struct list_head sparseirqhash_table[SPARSEIRQHASH_SIZE];
+
+static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
+ [0 ... NR_IRQS_LEGACY-1] = {
+ .irq = -1U,
+ .status = IRQ_DISABLED,
+ .chip = &no_irq_chip,
+ .handle_irq = handle_bad_irq,
+ .depth = 1,
+ .lock = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
+#ifdef CONFIG_SMP
+ .affinity = CPU_MASK_ALL
+#endif
+ }
+};
+
+/* FIXME: use bootmem alloc ...*/
+static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
+
+void __init __attribute__((weak)) arch_early_irq_init_work(void)
+{
+}
+
+void __init early_irq_init_work(void)
+{
+ struct irq_desc *desc;
+ int legacy_count;
+ int i;
+
+ /* init_work to init list for sparseirq */
+ for (i = 0; i < SPARSEIRQHASH_SIZE; i++)
+ INIT_LIST_HEAD(sparseirqhash_table + i);
+
+ desc = irq_desc_legacy;
+ legacy_count = ARRAY_SIZE(irq_desc_legacy);
+
+ for (i = 0; i < legacy_count; i++) {
+ struct list_head *hash_head;
+
+ hash_head = sparseirqhashentry(i);
+ desc[i].irq = i;
+ desc[i].kstat_irqs = kstat_irqs_legacy[i];
+ list_add_tail(&desc[i].hash_entry, hash_head);
+ list_add_tail(&desc[i].list, &sparse_irqs_head);
+ }
+
+ arch_early_irq_init_work();
+}
+
+struct irq_desc *irq_to_desc(unsigned int irq)
+{
+ struct irq_desc *desc;
+ struct list_head *hash_head;
+
+ hash_head = sparseirqhashentry(irq);
+
+ /*
+ * We can walk the hash lockfree, because the hash only
+ * grows, and we are careful when adding entries to the end:
+ */
+ list_for_each_entry(desc, hash_head, hash_entry) {
+ if (desc->irq == irq)
+ return desc;
+ }
+
+ return NULL;
+}
+
+struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+{
+ struct irq_desc *desc;
+ struct list_head *hash_head;
+ unsigned long flags;
+ int node;
+
+ desc = irq_to_desc(irq);
+ if (desc)
+ return desc;
+
+ hash_head = sparseirqhashentry(irq);
+
+ spin_lock_irqsave(&sparse_irq_lock, flags);
+
+ /*
+ * We have to do the hash-walk again, to avoid races
+ * with another CPU:
+ */
+ list_for_each_entry(desc, hash_head, hash_entry)
+ if (desc->irq == irq)
+ goto out_unlock;
+
+ if (cpu < 0)
+ cpu = smp_processor_id();
+
+ node = cpu_to_node(cpu);
+ desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
+ printk(KERN_DEBUG " alloc irq_desc for %d aka %#x on cpu %d node %d\n",
+ irq, irq, cpu, node);
+ init_one_irq_desc(irq, desc, cpu);
+
+ /*
+ * We use RCU's safe list-add method to make
+ * parallel walking of the hash-list safe:
+ */
+ list_add_tail_rcu(&desc->hash_entry, hash_head);
+ /*
+ * Add it to the global list:
+ */
+ list_add_tail_rcu(&desc->list, &sparse_irqs_head);
+
+out_unlock:
+ spin_unlock_irqrestore(&sparse_irq_lock, flags);
+
+ return desc;
+}
+
+struct irq_desc *irq_to_desc_alloc(unsigned int irq)
+{
+ return irq_to_desc_alloc_cpu(irq, -1);
+}
+
+#ifdef CONFIG_SMP
+static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
+ int cpu)
+{
+ struct irq_desc *desc;
+ unsigned int irq;
+ struct list_head *hash_head;
+ unsigned long flags;
+ int node;
+
+ irq = old_desc->irq;
+
+ hash_head = sparseirqhashentry(irq);
+
+ spin_lock_irqsave(&sparse_irq_lock, flags);
+ /*
+ * We have to do the hash-walk again, to avoid races
+ * with another CPU:
+ */
+ list_for_each_entry(desc, hash_head, hash_entry)
+ if (desc->irq == irq && old_desc != desc)
+ goto out_unlock;
+
+ if (cpu < 0)
+ cpu = smp_processor_id();
+
+ node = cpu_to_node(cpu);
+ desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
+ printk(KERN_DEBUG " move irq_desc for %d aka %#x to cpu %d node %d\n",
+ irq, irq, cpu, node);
+
+ init_copy_one_irq_desc(irq, old_desc, desc, cpu);
+
+ list_replace_rcu(&old_desc->hash_entry, &desc->hash_entry);
+ list_replace_rcu(&old_desc->list, &desc->list);
+
+ /* free the old one */
+ free_one_irq_desc(old_desc);
+ kfree(old_desc);
+
+out_unlock:
+ spin_unlock_irqrestore(&sparse_irq_lock, flags);
+
+ return desc;
+}
+
+struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
+{
+ int old_cpu;
+ int node, old_node;
+
+ old_cpu = desc->cpu;
+
+ /* those all static, do move them */
+ if (desc->irq < NR_IRQS_LEGACY)
+ return desc;
+
+ if (old_cpu != cpu) {
+ node = cpu_to_node(cpu);
+ old_node = cpu_to_node(old_cpu);
+ if (old_node != node)
+ desc = __real_move_irq_desc(desc, cpu);
+ else
+ desc->cpu = cpu;
+ }
+
+ return desc;
+}
+#endif
+
+#else
+
struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS-1] = {
.status = IRQ_DISABLED,
@@ -62,18 +362,49 @@ struct irq_desc irq_desc[NR_IRQS] __cach
}
};
+struct irq_desc *irq_to_desc(unsigned int irq)
+{
+ if (irq < nr_irqs)
+ return &irq_desc[irq];
+
+ return NULL;
+}
+struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+{
+ return irq_to_desc(irq);
+}
+struct irq_desc *irq_to_desc_alloc(unsigned int irq)
+{
+ return irq_to_desc(irq);
+}
+struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu)
+{
+ return old_desc;
+}
+#endif
+
/*
* What should we do if we get a hw irq event on an illegal vector?
* Each architecture has to answer this themself.
*/
-static void ack_bad(unsigned int irq)
+static void ack_bad_desc(unsigned int irq, struct irq_desc *desc)
{
- struct irq_desc *desc = irq_to_desc(irq);
-
print_irq_desc(irq, desc);
ack_bad_irq(irq);
}
+#ifdef CONFIG_SPARSE_IRQ
+static void ack_bad_wrapper(unsigned int irq, struct irq_desc **descp)
+{
+ ack_bad_desc(irq, *descp);
+}
+#else
+static void ack_bad_wrapper(unsigned int irq)
+{
+ ack_bad_desc(irq, irq_to_desc(irq));
+}
+#endif
+
/*
* NOP functions
*/
@@ -81,6 +412,15 @@ static void noop(unsigned int irq)
{
}
+#ifdef CONFIG_SPARSE_IRQ
+static void noop_wrapper(unsigned int irq, struct irq_desc **descp)
+#else
+static void noop_wrapper(unsigned int irq)
+#endif
+{
+ noop(irq);
+}
+
static unsigned int noop_ret(unsigned int irq)
{
return 0;
@@ -95,7 +435,7 @@ struct irq_chip no_irq_chip = {
.shutdown = noop,
.enable = noop,
.disable = noop,
- .ack = ack_bad,
+ .ack = ack_bad_wrapper,
.end = noop,
};
@@ -109,7 +449,7 @@ struct irq_chip dummy_irq_chip = {
.shutdown = noop,
.enable = noop,
.disable = noop,
- .ack = noop,
+ .ack = noop_wrapper,
.mask = noop,
.unmask = noop,
.end = noop,
@@ -179,8 +519,13 @@ unsigned int __do_IRQ(unsigned int irq)
/*
* No locking required for CPU-local interrupts:
*/
- if (desc->chip->ack)
+ if (desc->chip->ack) {
+#ifdef CONFIG_SPARSE_IRQ
+ desc->chip->ack(irq, &desc);
+#else
desc->chip->ack(irq);
+#endif
+ }
if (likely(!(desc->status & IRQ_DISABLED))) {
action_ret = handle_IRQ_event(irq, desc->action);
if (!noirqdebug)
@@ -191,8 +536,13 @@ unsigned int __do_IRQ(unsigned int irq)
}
spin_lock(&desc->lock);
- if (desc->chip->ack)
+ if (desc->chip->ack) {
+#ifdef CONFIG_SPARSE_IRQ
+ desc->chip->ack(irq, &desc);
+#else
desc->chip->ack(irq);
+#endif
+ }
/*
* REPLAY is when Linux resends an IRQ that was dropped earlier
* WAITING is used by probe to mark irqs that are being tested
@@ -261,17 +611,25 @@ out:
#ifdef CONFIG_TRACE_IRQFLAGS
-/*
- * lockdep: we want to handle all irq_desc locks as a single lock-class:
- */
-static struct lock_class_key irq_desc_lock_class;
-
void early_init_irq_lock_class(void)
{
+#ifndef CONFIG_SPARSE_IRQ
struct irq_desc *desc;
int i;
- for_each_irq_desc(i, desc)
+ for_each_irq_desc(i, desc) {
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+ } end_for_each_irq_desc();
+#endif
+}
+#endif
+
+#ifdef CONFIG_SPARSE_IRQ
+unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+ return desc->kstat_irqs[cpu];
}
#endif
+EXPORT_SYMBOL(kstat_irqs_cpu);
+
Index: linux-2.6/arch/x86/kernel/irq.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/irq.c
+++ linux-2.6/arch/x86/kernel/irq.c
@@ -99,25 +99,37 @@ static int show_other_interrupts(struct
int show_interrupts(struct seq_file *p, void *v)
{
unsigned long flags, any_count = 0;
- int i = *(loff_t *) v, j;
+ int i, j;
struct irqaction *action;
struct irq_desc *desc;
+ int head = 0;
+#ifdef CONFIG_SPARSE_IRQ
+ desc = list_entry(v, struct irq_desc, list);
+ i = desc->irq;
+ if (&desc->list == sparse_irqs_head.next)
+ head = 1;
+#else
+ i = *(loff_t *) v;
if (i > nr_irqs)
return 0;
if (i == nr_irqs)
return show_other_interrupts(p);
+ if (i == 0)
+ head = 1;
+
+ desc = irq_to_desc(i);
+#endif
/* print header */
- if (i == 0) {
+ if (head) {
seq_printf(p, " ");
for_each_online_cpu(j)
seq_printf(p, "CPU%-8d", j);
seq_putc(p, '\n');
}
- desc = irq_to_desc(i);
spin_lock_irqsave(&desc->lock, flags);
#ifndef CONFIG_SMP
any_count = kstat_irqs(i);
@@ -148,6 +160,12 @@ int show_interrupts(struct seq_file *p,
seq_putc(p, '\n');
out:
spin_unlock_irqrestore(&desc->lock, flags);
+
+#ifdef CONFIG_SPARSE_IRQ
+ if (&desc->list == sparse_irqs_head.prev)
+ show_other_interrupts(p);
+#endif
+
return 0;
}
Index: linux-2.6/include/linux/irqnr.h
===================================================================
--- linux-2.6.orig/include/linux/irqnr.h
+++ linux-2.6/include/linux/irqnr.h
@@ -7,18 +7,11 @@
# define for_each_irq_desc(irq, desc) \
for (irq = 0; irq < nr_irqs; irq++)
-#else
-extern int nr_irqs;
+# define end_for_each_irq_desc()
-# define for_each_irq_desc(irq, desc) \
- for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
-
-# define for_each_irq_desc_reverse(irq, desc) \
- for (irq = nr_irqs - 1, desc = irq_desc + (nr_irqs - 1); \
- irq >= 0; irq--, desc--)
+static inline early_sparse_irq_init_work(void)
+{
+}
#endif
-#define for_each_irq_nr(irq) \
- for (irq = 0; irq < nr_irqs; irq++)
-
#endif
Index: linux-2.6/arch/x86/kernel/irq_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/irq_32.c
+++ linux-2.6/arch/x86/kernel/irq_32.c
@@ -254,7 +254,7 @@ void fixup_irqs(cpumask_t map)
desc->chip->set_affinity(irq, mask);
else if (desc->action && !(warned++))
printk("Cannot set affinity for irq %i\n", irq);
- }
+ } end_for_each_irq_desc();
#if 0
barrier();
Index: linux-2.6/arch/x86/kernel/irq_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/irq_64.c
+++ linux-2.6/arch/x86/kernel/irq_64.c
@@ -129,7 +129,7 @@ void fixup_irqs(cpumask_t map)
printk("Broke affinity for irq %i\n", irq);
else if (!set_affinity)
printk("Cannot set affinity for irq %i\n", irq);
- }
+ } end_for_each_irq_desc();
/* That doesn't seem sufficient. Give it 1ms. */
local_irq_enable();
Index: linux-2.6/kernel/irq/proc.c
===================================================================
--- linux-2.6.orig/kernel/irq/proc.c
+++ linux-2.6/kernel/irq/proc.c
@@ -243,7 +243,8 @@ void init_irq_proc(void)
/*
* Create entries for all existing IRQs.
*/
- for_each_irq_desc(irq, desc)
+ for_each_irq_desc(irq, desc) {
register_irq_proc(irq, desc);
+ } end_for_each_irq_desc();
}
Index: linux-2.6/kernel/irq/spurious.c
===================================================================
--- linux-2.6.orig/kernel/irq/spurious.c
+++ linux-2.6/kernel/irq/spurious.c
@@ -99,7 +99,7 @@ static int misrouted_irq(int irq)
if (try_one_irq(i, desc))
ok = 1;
- }
+ } end_for_each_irq_desc();
/* So the caller can adjust the irq error counts */
return ok;
}
@@ -122,7 +122,7 @@ static void poll_spurious_irqs(unsigned
continue;
try_one_irq(i, desc);
- }
+ } end_for_each_irq_desc();
mod_timer(&poll_spurious_irq_timer,
jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
Index: linux-2.6/init/main.c
===================================================================
--- linux-2.6.orig/init/main.c
+++ linux-2.6/init/main.c
@@ -611,6 +611,8 @@ asmlinkage void __init start_kernel(void
sort_main_extable();
trap_init();
rcu_init();
+ /* init some links before init_ISA_irqs() */
+ early_irq_init_work();
init_IRQ();
pidhash_init();
init_timers();
Index: linux-2.6/arch/x86/include/asm/irq_vectors.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/irq_vectors.h
+++ linux-2.6/arch/x86/include/asm/irq_vectors.h
@@ -101,6 +101,8 @@
#define LAST_VM86_IRQ 15
#define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15)
+#define NR_IRQS_LEGACY 16
+
#if defined(CONFIG_X86_IO_APIC) && !defined(CONFIG_X86_VOYAGER)
# if NR_CPUS < MAX_IO_APICS
# define NR_IRQS (NR_VECTORS + (32 * NR_CPUS))
Index: linux-2.6/arch/x86/kernel/i8259.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/i8259.c
+++ linux-2.6/arch/x86/kernel/i8259.c
@@ -36,12 +36,21 @@ static int i8259A_auto_eoi;
DEFINE_SPINLOCK(i8259A_lock);
static void mask_and_ack_8259A(unsigned int);
+#ifdef CONFIG_SPARSE_IRQ
+static void mask_and_ack_8259A_wrapper(unsigned int irq, struct irq_desc **descp)
+#else
+static void mask_and_ack_8259A_wrapper(unsigned int irq)
+#endif
+{
+ mask_and_ack_8259A(irq);
+}
+
struct irq_chip i8259A_chip = {
.name = "XT-PIC",
.mask = disable_8259A_irq,
.disable = disable_8259A_irq,
.unmask = enable_8259A_irq,
- .mask_ack = mask_and_ack_8259A,
+ .mask_ack = mask_and_ack_8259A_wrapper,
};
/*
@@ -78,6 +87,15 @@ void disable_8259A_irq(unsigned int irq)
spin_unlock_irqrestore(&i8259A_lock, flags);
}
+#ifdef CONFIG_SPARSE_IRQ
+static void disable_8259A_irq_wrapper(unsigned int irq, struct irq_desc **descp)
+#else
+static void disable_8259A_irq_wrapper(unsigned int irq)
+#endif
+{
+ disable_8259A_irq(irq);
+}
+
void enable_8259A_irq(unsigned int irq)
{
unsigned int mask = ~(1 << irq);
@@ -348,9 +366,9 @@ void init_8259A(int auto_eoi)
* In AEOI mode we just have to mask the interrupt
* when acking.
*/
- i8259A_chip.mask_ack = disable_8259A_irq;
+ i8259A_chip.mask_ack = disable_8259A_irq_wrapper;
else
- i8259A_chip.mask_ack = mask_and_ack_8259A;
+ i8259A_chip.mask_ack = mask_and_ack_8259A_wrapper;
udelay(100); /* wait for 8259A to initialize */
Index: linux-2.6/arch/x86/kernel/uv_irq.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/uv_irq.c
+++ linux-2.6/arch/x86/kernel/uv_irq.c
@@ -18,6 +18,15 @@ static void uv_noop(unsigned int irq)
{
}
+#ifdef CONFIG_SPARSE_IRQ
+static void uv_noop_wrapper(unsigned int irq, struct irq_desc **descp)
+#else
+static void uv_noop_wrapper(unsigned int irq)
+#endif
+{
+ uv_noop(irq);
+}
+
static unsigned int uv_noop_ret(unsigned int irq)
{
return 0;
@@ -28,16 +37,25 @@ static void uv_ack_apic(unsigned int irq
ack_APIC_irq();
}
+#ifdef CONFIG_SPARSE_IRQ
+static void uv_ack_apic_wrapper(unsigned int irq, struct irq_desc **descp)
+#else
+static void uv_ack_apic_wrapper(unsigned int irq)
+#endif
+{
+ uv_ack_apic(irq);
+}
+
struct irq_chip uv_irq_chip = {
.name = "UV-CORE",
.startup = uv_noop_ret,
.shutdown = uv_noop,
.enable = uv_noop,
.disable = uv_noop,
- .ack = uv_noop,
+ .ack = uv_noop_wrapper,
.mask = uv_noop,
.unmask = uv_noop,
- .eoi = uv_ack_apic,
+ .eoi = uv_ack_apic_wrapper,
.end = uv_noop,
};
--
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