genirq: remove sparse irq code

This code is not ready, but we need to rip it out instead of rebasing
as we would lose the APIC/IO_APIC unification otherwise.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/io_apic.c

@@ -111,9 +111,6 @@ struct irq_cfg;
 struct irq_pin_list;
 struct irq_cfg {
 	unsigned int irq;
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	struct irq_cfg *next;
-#endif
 	struct irq_pin_list *irq_2_pin;
 	cpumask_t domain;
 	cpumask_t old_domain;
@@ -151,15 +148,6 @@ static void init_one_irq_cfg(struct irq_cfg *cfg)
 
 static struct irq_cfg *irq_cfgx;
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-/*
- * Protect the irq_cfgx_free freelist:
- */
-static DEFINE_SPINLOCK(irq_cfg_lock);
-
-static struct irq_cfg *irq_cfgx_free;
-#endif
-
 static void __init init_work(void *data)
 {
 	struct dyn_array *da = data;
@@ -174,114 +162,7 @@ static void __init init_work(void *data)
 	legacy_count = ARRAY_SIZE(irq_cfg_legacy);
 	for (i = legacy_count; i < *da->nr; i++)
 		init_one_irq_cfg(&cfg[i]);
-
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	for (i = 1; i < *da->nr; i++)
-		cfg[i-1].next = &cfg[i];
-
-	irq_cfgx_free = &irq_cfgx[legacy_count];
-	irq_cfgx[legacy_count - 1].next = NULL;
-#endif
-}
-
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-/* need to be biger than size of irq_cfg_legacy */
-static int nr_irq_cfg = 32;
-
-static int __init parse_nr_irq_cfg(char *arg)
-{
-	if (arg) {
-		nr_irq_cfg = simple_strtoul(arg, NULL, 0);
-		if (nr_irq_cfg < 32)
-			nr_irq_cfg = 32;
-	}
-	return 0;
-}
-
-early_param("nr_irq_cfg", parse_nr_irq_cfg);
-
-#define for_each_irq_cfg(irqX, cfg)           \
-        for (cfg = irq_cfgx, irqX = cfg->irq; cfg; cfg = cfg->next, irqX = cfg ? cfg->irq : -1U)
-
-
-DEFINE_DYN_ARRAY(irq_cfgx, sizeof(struct irq_cfg), nr_irq_cfg, PAGE_SIZE, init_work);
-
-static struct irq_cfg *irq_cfg(unsigned int irq)
-{
-	struct irq_cfg *cfg;
-
-	cfg = irq_cfgx;
-	while (cfg) {
-		if (cfg->irq == irq)
-			return cfg;
-
-		cfg = cfg->next;
-	}
-
-	return NULL;
-}
-
-static struct irq_cfg *irq_cfg_alloc(unsigned int irq)
-{
-	struct irq_cfg *cfg, *cfg_pri;
-	unsigned long flags;
-	int count = 0;
-	int i;
-
-	cfg_pri = cfg = irq_cfgx;
-	while (cfg) {
-		if (cfg->irq == irq)
-			return cfg;
-
-		cfg_pri = cfg;
-		cfg = cfg->next;
-		count++;
-	}
-
-	spin_lock_irqsave(&irq_cfg_lock, flags);
-	if (!irq_cfgx_free) {
-		unsigned long phys;
-		unsigned long total_bytes;
-		/*
-		 *  we run out of pre-allocate ones, allocate more
-		 */
-		printk(KERN_DEBUG "try to get more irq_cfg %d\n", nr_irq_cfg);
-
-		total_bytes = sizeof(struct irq_cfg) * nr_irq_cfg;
-		if (after_bootmem)
-			cfg = kzalloc(total_bytes, GFP_ATOMIC);
-		else
-			cfg = __alloc_bootmem_nopanic(total_bytes, PAGE_SIZE, 0);
-
-		if (!cfg)
-			panic("please boot with nr_irq_cfg= %d\n", count * 2);
-
-		phys = __pa(cfg);
-		printk(KERN_DEBUG "irq_cfg ==> [%#lx - %#lx]\n", phys, phys + total_bytes);
-
-		for (i = 0; i < nr_irq_cfg; i++)
-			init_one_irq_cfg(&cfg[i]);
-
-		for (i = 1; i < nr_irq_cfg; i++)
-			cfg[i-1].next = &cfg[i];
-
-		irq_cfgx_free = cfg;
-	}
-
-	cfg = irq_cfgx_free;
-	irq_cfgx_free = irq_cfgx_free->next;
-	cfg->next = NULL;
-	if (cfg_pri)
-		cfg_pri->next = cfg;
-	else
-		irq_cfgx = cfg;
-	cfg->irq = irq;
-
-	spin_unlock_irqrestore(&irq_cfg_lock, flags);
-
-	return cfg;
 }
-#else
 
 #define for_each_irq_cfg(irq, cfg)		\
 	for (irq = 0, cfg = &irq_cfgx[irq]; irq < nr_irqs; irq++, cfg = &irq_cfgx[irq])
@@ -300,7 +181,6 @@ struct irq_cfg *irq_cfg_alloc(unsigned int irq)
 	return irq_cfg(irq);
 }
 
-#endif
 /*
  * This is performance-critical, we want to do it O(1)
  *
@@ -3068,9 +2948,7 @@ unsigned int create_irq_nr(unsigned int irq_want)
 	unsigned long flags;
 	struct irq_cfg *cfg_new;
 
-#ifndef CONFIG_HAVE_SPARSE_IRQ
 	irq_want = nr_irqs - 1;
-#endif
 
 	irq = 0;
 	spin_lock_irqsave(&vector_lock, flags);

arch/x86/kernel/irq_32.c

@@ -272,20 +272,12 @@ int show_interrupts(struct seq_file *p, void *v)
 	struct irq_desc *desc = NULL;
 	int tail = 0;
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	desc = (struct irq_desc *)v;
-	entries = -1U;
-	i = desc->irq;
-	if (!desc->next)
-		tail = 1;
-#else
 	entries = nr_irqs - 1;
 	i = *(loff_t *) v;
 	if (i == nr_irqs)
 		tail = 1;
 	else
 		desc = irq_to_desc(i);
-#endif
 
 	if (i == 0) {
 		seq_printf(p, "           ");

arch/x86/kernel/irq_64.c

@@ -77,20 +77,12 @@ int show_interrupts(struct seq_file *p, void *v)
 	struct irq_desc *desc = NULL;
 	int tail = 0;
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	desc = (struct irq_desc *)v;
-	entries = -1U;
-	i = desc->irq;
-	if (!desc->next)
-		tail = 1;
-#else
 	entries = nr_irqs - 1;
 	i = *(loff_t *) v;
 	if (i == nr_irqs)
 		tail = 1;
 	else
 		desc = irq_to_desc(i);
-#endif
 
 	if (i == 0) {
 		seq_printf(p, "           ");

drivers/char/random.c

@@ -558,8 +558,6 @@ struct timer_rand_state {
 	unsigned dont_count_entropy:1;
 };
 
-#ifndef CONFIG_HAVE_SPARSE_IRQ
-
 #ifdef CONFIG_HAVE_DYN_ARRAY
 static struct timer_rand_state **irq_timer_state;
 DEFINE_DYN_ARRAY(irq_timer_state, sizeof(struct timer_rand_state *), nr_irqs, PAGE_SIZE, NULL);
@@ -583,33 +581,6 @@ static void set_timer_rand_state(unsigned int irq, struct timer_rand_state *stat
 	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;
 
 /*
@@ -967,10 +938,8 @@ void rand_initialize_irq(int irq)
 {
 	struct timer_rand_state *state;
 
-#ifndef CONFIG_HAVE_SPARSE_IRQ
 	if (irq >= nr_irqs)
 		return;
-#endif
 
 	state = get_timer_rand_state(irq);
 

drivers/pci/htirq.c

@@ -82,18 +82,6 @@ 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;
-
-	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.
@@ -110,7 +98,6 @@ int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
 	int max_irq;
 	int pos;
 	int irq;
-	unsigned int irq_want;
 
 	pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ);
 	if (!pos)
@@ -138,12 +125,8 @@ int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
 	cfg->msg.address_lo = 0xffffffff;
 	cfg->msg.address_hi = 0xffffffff;
 
-	irq_want= build_irq_for_pci_dev(dev);
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	irq = create_irq_nr(irq_want + idx);
-#else
 	irq = create_irq();
-#endif
+
 	if (irq <= 0) {
 		kfree(cfg);
 		return -EBUSY;

drivers/pci/intr_remapping.c

@@ -19,78 +19,6 @@ struct irq_2_iommu {
 	u8  irte_mask;
 };
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-static struct irq_2_iommu *irq_2_iommuX;
-/* fill one page ? */
-static int nr_irq_2_iommu = 0x100;
-static int irq_2_iommu_index;
-DEFINE_DYN_ARRAY(irq_2_iommuX, sizeof(struct irq_2_iommu), nr_irq_2_iommu, PAGE_SIZE, NULL);
-
-extern void *__alloc_bootmem_nopanic(unsigned long size,
-				     unsigned long align,
-				     unsigned long goal);
-
-static struct irq_2_iommu *get_one_free_irq_2_iommu(int not_used)
-{
-	struct irq_2_iommu *iommu;
-	unsigned long total_bytes;
-
-	if (irq_2_iommu_index >= nr_irq_2_iommu) {
-		/*
-		 *  we run out of pre-allocate ones, allocate more
-		 */
-		printk(KERN_DEBUG "try to get more irq_2_iommu %d\n", nr_irq_2_iommu);
-
-		total_bytes = sizeof(struct irq_2_iommu)*nr_irq_2_iommu;
-
-		if (after_bootmem)
-			iommu = kzalloc(total_bytes, GFP_ATOMIC);
-		else
-			iommu = __alloc_bootmem_nopanic(total_bytes, PAGE_SIZE, 0);
-
-		if (!iommu)
-			panic("can not get more irq_2_iommu\n");
-
-		irq_2_iommuX = iommu;
-		irq_2_iommu_index = 0;
-	}
-
-	iommu = &irq_2_iommuX[irq_2_iommu_index];
-	irq_2_iommu_index++;
-	return iommu;
-}
-
-static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
-{
-	struct irq_desc *desc;
-
-	desc = irq_to_desc(irq);
-
-	BUG_ON(!desc);
-
-	return desc->irq_2_iommu;
-}
-
-static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
-{
-	struct irq_desc *desc;
-	struct irq_2_iommu *irq_iommu;
-
-	/*
-	 * alloc irq desc if not allocated already.
-	 */
-	desc = irq_to_desc_alloc(irq);
-
-	irq_iommu = desc->irq_2_iommu;
-
-	if (!irq_iommu)
-		desc->irq_2_iommu = get_one_free_irq_2_iommu(irq);
-
-	return desc->irq_2_iommu;
-}
-
-#else /* !CONFIG_HAVE_SPARSE_IRQ */
-
 #ifdef CONFIG_HAVE_DYN_ARRAY
 static struct irq_2_iommu *irq_2_iommuX;
 DEFINE_DYN_ARRAY(irq_2_iommuX, sizeof(struct irq_2_iommu), nr_irqs, PAGE_SIZE, NULL);
@@ -109,7 +37,6 @@ 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);
 
@@ -166,11 +93,9 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
 	if (!count)
 		return -1;
 
-#ifndef	CONFIG_HAVE_SPARSE_IRQ
 	/* protect irq_2_iommu_alloc later */
 	if (irq >= nr_irqs)
 		return -1;
-#endif
 
 	/*
 	 * start the IRTE search from index 0.

fs/proc/proc_misc.c

@@ -529,13 +529,10 @@ static int show_stat(struct seq_file *p, void *v)
 		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_desc(j, desc)
-		{
-			unsigned int temp;
+			sum += kstat_irqs_cpu(j, i);
 
-			temp = kstat_irqs_cpu(j, i);
-			sum += temp;
-		}
 		sum += arch_irq_stat_cpu(i);
 	}
 	sum += arch_irq_stat();
@@ -578,21 +575,13 @@ static int show_stat(struct seq_file *p, void *v)
 	seq_printf(p, "intr %llu", (unsigned long long)sum);
 
 	/* sum again ? it could be updated? */
-	for_each_irq_desc(j, desc)
-	{
+	for_each_irq_desc(j, desc) {
 		per_irq_sum = 0;
-		for_each_possible_cpu(i) {
-			unsigned int temp;
 
-			temp = kstat_irqs_cpu(j, i);
-			per_irq_sum += temp;
-		}
+		for_each_possible_cpu(i)
+			per_irq_sum += kstat_irqs_cpu(j, i);
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-		seq_printf(p, " %#x:%u", j, per_irq_sum);
-#else
 		seq_printf(p, " %u", per_irq_sum);
-#endif
 	}
 
 	seq_printf(p,
@@ -645,36 +634,14 @@ static const struct file_operations proc_stat_operations = {
  */
 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 {
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	struct irq_desc *desc;
-	int irq;
-	int count = *pos;
-
-	for_each_irq_desc(irq, desc) {
-		if (count-- == 0)
-			return desc;
-	}
-
-	return NULL;
-#else
 	return (*pos <= nr_irqs) ? pos : NULL;
-#endif
 }
 
 
 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 {
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	struct irq_desc *desc;
-
-	desc = ((struct irq_desc *)v)->next;
-	(*pos)++;
-
-	return desc;
-#else
 	(*pos)++;
 	return (*pos <= nr_irqs) ? pos : NULL;
-#endif
 }
 
 static void int_seq_stop(struct seq_file *f, void *v)

include/linux/irq.h

@@ -167,15 +167,8 @@ struct irq_2_iommu;
  */
 struct irq_desc {
 	unsigned int		irq;
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	struct irq_desc		*next;
-	struct timer_rand_state *timer_rand_state;
-#endif
 #ifdef CONFIG_HAVE_DYN_ARRAY
 	unsigned int            *kstat_irqs;
-#endif
-#if defined(CONFIG_INTR_REMAP) && defined(CONFIG_HAVE_SPARSE_IRQ)
-       struct irq_2_iommu      *irq_2_iommu;
 #endif
 	irq_flow_handler_t	handle_irq;
 	struct irq_chip		*chip;
@@ -205,8 +198,6 @@ struct irq_desc {
 } ____cacheline_internodealigned_in_smp;
 
 
-#ifndef CONFIG_HAVE_SPARSE_IRQ
-
 #ifndef CONFIG_HAVE_DYN_ARRAY
 /* could be removed if we get rid of all irq_desc reference */
 extern struct irq_desc irq_desc[NR_IRQS];
@@ -224,17 +215,6 @@ static inline struct irq_desc *irq_to_desc_alloc(unsigned int irq)
 	return irq_to_desc(irq);
 }
 
-#else
-
-extern struct irq_desc *irq_to_desc(unsigned int irq);
-extern struct irq_desc *irq_to_desc_alloc(unsigned int irq);
-
-extern struct irq_desc *sparse_irqs;
-#define for_each_irq_desc(irqX, desc)		\
-	for (desc = sparse_irqs, irqX = desc->irq; desc; desc = desc->next, irqX = desc ? desc->irq : -1U)
-
-#endif
-
 #ifdef CONFIG_HAVE_DYN_ARRAY
 #define kstat_irqs_this_cpu(DESC) \
 	((DESC)->kstat_irqs[smp_processor_id()])

kernel/irq/handle.c

@@ -111,15 +111,6 @@ static void init_kstat_irqs(struct irq_desc *desc, int nr_desc, int nr)
 	}
 }
 
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-/*
- * Protect the sparse_irqs_free freelist:
- */
-static DEFINE_SPINLOCK(sparse_irq_lock);
-static struct irq_desc *sparse_irqs_free;
-struct irq_desc *sparse_irqs;
-#endif
-
 static void __init init_work(void *data)
 {
 	struct dyn_array *da = data;
@@ -130,121 +121,16 @@ static void __init init_work(void *data)
 
 	for (i = 0; i < *da->nr; i++) {
 		init_one_irq_desc(&desc[i]);
-#ifndef CONFIG_HAVE_SPARSE_IRQ
 		desc[i].irq = i;
-#endif
 	}
 
 	/* init kstat_irqs, nr_cpu_ids is ready already */
 	init_kstat_irqs(desc, *da->nr, nr_cpu_ids);
-
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-	for (i = 1; i < *da->nr; i++)
-		desc[i-1].next = &desc[i];
-
-	sparse_irqs_free = sparse_irqs;
-	sparse_irqs = NULL;
-#endif
-}
-
-#ifdef CONFIG_HAVE_SPARSE_IRQ
-static int nr_irq_desc = 32;
-
-static int __init parse_nr_irq_desc(char *arg)
-{
-	if (arg)
-		nr_irq_desc = simple_strtoul(arg, NULL, 0);
-	return 0;
 }
 
-early_param("nr_irq_desc", parse_nr_irq_desc);
-
-DEFINE_DYN_ARRAY(sparse_irqs, sizeof(struct irq_desc), nr_irq_desc, PAGE_SIZE, init_work);
-
-struct irq_desc *irq_to_desc(unsigned int irq)
-{
-	struct irq_desc *desc;
-
-	desc = sparse_irqs;
-	while (desc) {
-		if (desc->irq == irq)
-			return desc;
-
-		desc = desc->next;
-	}
-	return NULL;
-}
-
-struct irq_desc *irq_to_desc_alloc(unsigned int irq)
-{
-	struct irq_desc *desc, *desc_pri;
-	unsigned long flags;
-	int count = 0;
-	int i;
-
-	desc_pri = desc = sparse_irqs;
-	while (desc) {
-		if (desc->irq == irq)
-			return desc;
-
-		desc_pri = desc;
-		desc = desc->next;
-		count++;
-	}
-
-	spin_lock_irqsave(&sparse_irq_lock, flags);
-	/*
-	 *  we run out of pre-allocate ones, allocate more
-	 */
-	if (!sparse_irqs_free) {
-		unsigned long phys;
-		unsigned long total_bytes;
-
-		printk(KERN_DEBUG "try to get more irq_desc %d\n", nr_irq_desc);
-
-		total_bytes = sizeof(struct irq_desc) * nr_irq_desc;
-		if (after_bootmem)
-			desc = kzalloc(total_bytes, GFP_ATOMIC);
-		else
-			desc = __alloc_bootmem_nopanic(total_bytes, PAGE_SIZE, 0);
-
-		if (!desc)
-			panic("please boot with nr_irq_desc= %d\n", count * 2);
-
-		phys = __pa(desc);
-		printk(KERN_DEBUG "irq_desc ==> [%#lx - %#lx]\n", phys, phys + total_bytes);
-
-		for (i = 0; i < nr_irq_desc; i++)
-			init_one_irq_desc(&desc[i]);
-
-		for (i = 1; i < nr_irq_desc; i++)
-			desc[i-1].next = &desc[i];
-
-		/* init kstat_irqs, nr_cpu_ids is ready already */
-		init_kstat_irqs(desc, nr_irq_desc, nr_cpu_ids);
-
-		sparse_irqs_free = desc;
-	}
-
-	desc = sparse_irqs_free;
-	sparse_irqs_free = sparse_irqs_free->next;
-	desc->next = NULL;
-	if (desc_pri)
-		desc_pri->next = desc;
-	else
-		sparse_irqs = desc;
-	desc->irq = irq;
-
-	spin_unlock_irqrestore(&sparse_irq_lock, flags);
-
-	return desc;
-}
-#else
 struct irq_desc *irq_desc;
 DEFINE_DYN_ARRAY(irq_desc, sizeof(struct irq_desc), nr_irqs, PAGE_SIZE, init_work);
 
-#endif
-
 #else
 
 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {