Messages in this thread Patch in this message |  | | From | Shanker Donthineni <> | Subject | [PATCH 3/5] genirq: Introduce two helper functions | Date | Sun, 29 Jan 2023 18:57:23 -0600 |
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Introduce helper functions irq_find_free_area() and irq_find_next_irq(). The first function is used to locate available free space for a new IRQ, and the second one is used to find the next valid IRQ.
These helper functions will be later modified to utilize the Maple data structure in a later patch. Additionally, in order to align the moving to the new data structure, the IRQ_BITMAP_BITS is renamed to MAX_SPARSE_IRQS.
Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com> --- kernel/irq/internals.h | 4 ++-- kernel/irq/irqdesc.c | 28 +++++++++++++++++++--------- 2 files changed, 21 insertions(+), 11 deletions(-)
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index 2fd17057ed4b..5d741b0e7d5e 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -12,9 +12,9 @@ #include <linux/sched/clock.h> #ifdef CONFIG_SPARSE_IRQ -# define IRQ_BITMAP_BITS (NR_IRQS + 8196) +# define MAX_SPARSE_IRQS (NR_IRQS + 8196) #else -# define IRQ_BITMAP_BITS NR_IRQS +# define MAX_SPARSE_IRQS NR_IRQS #endif #define istate core_internal_state__do_not_mess_with_it diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index a4911f7ebb07..aacfb4826c5e 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -131,7 +131,18 @@ int nr_irqs = NR_IRQS; EXPORT_SYMBOL_GPL(nr_irqs); static DEFINE_MUTEX(sparse_irq_lock); -static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS); +static DECLARE_BITMAP(allocated_irqs, MAX_SPARSE_IRQS); + +static int irq_find_free_area(unsigned int from, unsigned int cnt) +{ + return bitmap_find_next_zero_area(allocated_irqs, MAX_SPARSE_IRQS, + from, cnt, 0); +} + +static unsigned int irq_find_next_irq(unsigned int offset) +{ + return find_next_bit(allocated_irqs, nr_irqs, offset); +} #ifdef CONFIG_SPARSE_IRQ @@ -519,7 +530,7 @@ static int alloc_descs(unsigned int start, unsigned int cnt, int node, static int irq_expand_nr_irqs(unsigned int nr) { - if (nr > IRQ_BITMAP_BITS) + if (nr > MAX_SPARSE_IRQS) return -ENOMEM; nr_irqs = nr; return 0; @@ -537,11 +548,11 @@ int __init early_irq_init(void) printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n", NR_IRQS, nr_irqs, initcnt); - if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS)) - nr_irqs = IRQ_BITMAP_BITS; + if (WARN_ON(nr_irqs > MAX_SPARSE_IRQS)) + nr_irqs = MAX_SPARSE_IRQS; - if (WARN_ON(initcnt > IRQ_BITMAP_BITS)) - initcnt = IRQ_BITMAP_BITS; + if (WARN_ON(initcnt > MAX_SPARSE_IRQS)) + initcnt = MAX_SPARSE_IRQS; if (initcnt > nr_irqs) nr_irqs = initcnt; @@ -813,8 +824,7 @@ __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node, mutex_lock(&sparse_irq_lock); - start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS, - from, cnt, 0); + start = irq_find_free_area(from, cnt); ret = -EEXIST; if (irq >=0 && start != irq) goto unlock; @@ -839,7 +849,7 @@ EXPORT_SYMBOL_GPL(__irq_alloc_descs); */ unsigned int irq_get_next_irq(unsigned int offset) { - return find_next_bit(allocated_irqs, nr_irqs, offset); + return irq_find_next_irq(offset); } struct irq_desc * -- 2.25.1
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