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Subject[patch 02/19] genirq: Create irq_data
Low level chip functions need access to irq_desc->handler_data,
irq_desc->chip_data and irq_desc->msi_desc. We hand down the irq
number to the low level functions, so they need to lookup irq_desc.
With sparse irq this means a radix tree lookup.

We could hand down irq_desc itself, but low level chip functions have
no need to fiddle with it directly and we want to restrict access to
irq_desc further.

Preparatory patch for new chip functions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/irq.h | 48 ++++++++++++++++++++++++++++++++----------------
kernel/irq/chip.c | 22 +++++++++++++---------
kernel/irq/handle.c | 11 +++++++++++
3 files changed, 56 insertions(+), 25 deletions(-)
Index: linux-2.6-tip/include/linux/irq.h
===================================================================
--- linux-2.6-tip.orig/include/linux/irq.h
+++ linux-2.6-tip/include/linux/irq.h
@@ -84,6 +84,27 @@ struct proc_dir_entry;
struct msi_desc;

/**
+ * struct irq_data - per irq and irq chip data passed down to chip functions
+ * @irq: interrupt number
+ * @chip: low level interrupt hardware access
+ * @handler_data: per-IRQ data for the irq_chip methods
+ * @chip_data: platform-specific per-chip private data for the chip
+ * methods, to allow shared chip implementations
+ * @msi_desc: MSI descriptor
+ * @affinity: pointer to irq affinity mask
+ */
+struct irq_data {
+ unsigned int irq;
+ struct irq_chip *chip;
+ void *handler_data;
+ void *chip_data;
+ struct msi_desc *msi_desc;
+#ifdef CONFIG_SMP
+ cpumask_var_t *affinity;
+#endif
+};
+
+/**
* struct irq_chip - hardware interrupt chip descriptor
*
* @name: name for /proc/interrupts
@@ -146,10 +167,7 @@ struct irq_2_iommu;
* @irq_2_iommu: iommu with this irq
* @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
* @chip: low level interrupt hardware access
- * @msi_desc: MSI descriptor
- * @handler_data: per-IRQ data for the irq_chip methods
- * @chip_data: platform-specific per-chip private data for the chip
- * methods, to allow shared chip implementations
+ * @irq_data: per irq and chip data passed down to chip functions
* @action: the irq action chain
* @status: status information
* @depth: disable-depth, for nested irq_disable() calls
@@ -175,9 +193,7 @@ struct irq_desc {
#endif
irq_flow_handler_t handle_irq;
struct irq_chip *chip;
- struct msi_desc *msi_desc;
- void *handler_data;
- void *chip_data;
+ struct irq_data irq_data;
struct irqaction *action; /* IRQ action list */
unsigned int status; /* IRQ status */

@@ -408,18 +424,18 @@ extern int set_irq_msi(unsigned int irq,

static inline void set_irq_desc_chip_data(struct irq_desc *desc, void *data)
{
- desc->chip_data = data;
+ desc->irq_data.chip_data = data;
}

#define get_irq_chip(irq) (irq_to_desc(irq)->chip)
-#define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
-#define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
-#define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
-
-#define get_irq_desc_chip(desc) ((desc)->chip)
-#define get_irq_desc_chip_data(desc) ((desc)->chip_data)
-#define get_irq_desc_data(desc) ((desc)->handler_data)
-#define get_irq_desc_msi(desc) ((desc)->msi_desc)
+#define get_irq_chip_data(irq) (irq_to_desc(irq)->irq_data.chip_data)
+#define get_irq_data(irq) (irq_to_desc(irq)->irq_data.handler_data)
+#define get_irq_msi(irq) (irq_to_desc(irq)->irq_data.msi_desc)
+
+#define get_irq_desc_chip(desc) ((desc)->irq_data.chip)
+#define get_irq_desc_chip_data(desc) ((desc)->irq_data.chip_data)
+#define get_irq_desc_data(desc) ((desc)->irq_data.handler_data)
+#define get_irq_desc_msi(desc) ((desc)->irq_data.msi_desc)

#endif /* CONFIG_GENERIC_HARDIRQS */

Index: linux-2.6-tip/kernel/irq/chip.c
===================================================================
--- linux-2.6-tip.orig/kernel/irq/chip.c
+++ linux-2.6-tip/kernel/irq/chip.c
@@ -33,12 +33,13 @@ static void dynamic_irq_init_x(unsigned
raw_spin_lock_irqsave(&desc->lock, flags);
desc->status = IRQ_DISABLED;
desc->chip = &no_irq_chip;
+ desc->irq_data.chip = &no_irq_chip;
desc->handle_irq = handle_bad_irq;
desc->depth = 1;
- desc->msi_desc = NULL;
- desc->handler_data = NULL;
+ desc->irq_data.msi_desc = NULL;
+ desc->irq_data.handler_data = NULL;
if (!keep_chip_data)
- desc->chip_data = NULL;
+ desc->irq_data.chip_data = NULL;
desc->action = NULL;
desc->irq_count = 0;
desc->irqs_unhandled = 0;
@@ -88,12 +89,13 @@ static void dynamic_irq_cleanup_x(unsign
irq);
return;
}
- desc->msi_desc = NULL;
- desc->handler_data = NULL;
+ desc->irq_data.msi_desc = NULL;
+ desc->irq_data.handler_data = NULL;
if (!keep_chip_data)
- desc->chip_data = NULL;
+ desc->irq_data.chip_data = NULL;
desc->handle_irq = handle_bad_irq;
desc->chip = &no_irq_chip;
+ desc->irq_data.chip = &no_irq_chip;
desc->name = NULL;
clear_kstat_irqs(desc);
raw_spin_unlock_irqrestore(&desc->lock, flags);
@@ -141,6 +143,7 @@ int set_irq_chip(unsigned int irq, struc
raw_spin_lock_irqsave(&desc->lock, flags);
irq_chip_set_defaults(chip);
desc->chip = chip;
+ desc->irq_data.chip = chip;
raw_spin_unlock_irqrestore(&desc->lock, flags);

return 0;
@@ -193,7 +196,7 @@ int set_irq_data(unsigned int irq, void
}

raw_spin_lock_irqsave(&desc->lock, flags);
- desc->handler_data = data;
+ desc->irq_data.handler_data = data;
raw_spin_unlock_irqrestore(&desc->lock, flags);
return 0;
}
@@ -218,7 +221,7 @@ int set_irq_msi(unsigned int irq, struct
}

raw_spin_lock_irqsave(&desc->lock, flags);
- desc->msi_desc = entry;
+ desc->irq_data.msi_desc = entry;
if (entry)
entry->irq = irq;
raw_spin_unlock_irqrestore(&desc->lock, flags);
@@ -249,7 +252,7 @@ int set_irq_chip_data(unsigned int irq,
}

raw_spin_lock_irqsave(&desc->lock, flags);
- desc->chip_data = data;
+ desc->irq_data.chip_data = data;
raw_spin_unlock_irqrestore(&desc->lock, flags);

return 0;
@@ -685,6 +688,7 @@ __set_irq_handler(unsigned int irq, irq_
* dummy_irq_chip for easy transition.
*/
desc->chip = &dummy_irq_chip;
+ desc->irq_data.chip = &dummy_irq_chip;
}

chip_bus_lock(irq, desc);
Index: linux-2.6-tip/kernel/irq/handle.c
===================================================================
--- linux-2.6-tip.orig/kernel/irq/handle.c
+++ linux-2.6-tip/kernel/irq/handle.c
@@ -106,8 +106,11 @@ static void init_one_irq_desc(int irq, s

raw_spin_lock_init(&desc->lock);
desc->irq = irq;
+ desc->irq_data.irq = irq;
+ desc->irq_data.chip = desc->chip;
#ifdef CONFIG_SMP
desc->node = node;
+ desc->irq_data.affinity = &desc->affinity;
#endif
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
init_kstat_irqs(desc, node, nr_cpu_ids);
@@ -185,8 +188,11 @@ int __init early_irq_init(void)

for (i = 0; i < legacy_count; i++) {
desc[i].irq = i;
+ desc[i].irq_data.irq = i;
+ desc[i].irq_data.chip = desc[i].chip;
#ifdef CONFIG_SMP
desc[i].node = node;
+ desc[i].irq_data.affinity = &desc[i].affinity;
#endif
desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
@@ -265,6 +271,11 @@ int __init early_irq_init(void)

for (i = 0; i < count; i++) {
desc[i].irq = i;
+ desc[i].irq_data.irq = i;
+ desc[i].irq_data.chip = desc[i].chip;
+#ifdef CONFIG_SMP
+ desc[i].irq_data.affinity = &desc[i].affinity;
+#endif
alloc_desc_masks(&desc[i], 0, true);
init_desc_masks(&desc[i]);
desc[i].kstat_irqs = kstat_irqs_all[i];



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