irq_domain: Move irq_domain code from powerpc to kernel/irq
This patch only moves the code. It doesn't make any changes, and the code is still only compiled for powerpc. Follow-on patches will generalize the code for other architectures. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Milton Miller <miltonm@bga.com> Tested-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Grant Likely
@@ -486,17 +486,6 @@ void do_softirq(void)
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local_irq_restore(flags);
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}
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/*
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* IRQ controller and virtual interrupts
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*/
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static LIST_HEAD(irq_domain_list);
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static DEFINE_MUTEX(irq_domain_mutex);
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static DEFINE_MUTEX(revmap_trees_mutex);
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static unsigned int irq_virq_count = NR_IRQS;
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static struct irq_domain *irq_default_host;
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irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
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{
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return d->hwirq;
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@@ -510,362 +499,6 @@ irq_hw_number_t virq_to_hw(unsigned int virq)
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}
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EXPORT_SYMBOL_GPL(virq_to_hw);
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static int default_irq_host_match(struct irq_domain *h, struct device_node *np)
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{
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return h->of_node != NULL && h->of_node == np;
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}
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struct irq_domain *irq_alloc_host(struct device_node *of_node,
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unsigned int revmap_type,
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unsigned int revmap_arg,
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struct irq_domain_ops *ops,
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irq_hw_number_t inval_irq)
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{
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struct irq_domain *host, *h;
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unsigned int size = sizeof(struct irq_domain);
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unsigned int i;
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unsigned int *rmap;
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/* Allocate structure and revmap table if using linear mapping */
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if (revmap_type == IRQ_DOMAIN_MAP_LINEAR)
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size += revmap_arg * sizeof(unsigned int);
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host = kzalloc(size, GFP_KERNEL);
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if (host == NULL)
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return NULL;
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/* Fill structure */
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host->revmap_type = revmap_type;
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host->inval_irq = inval_irq;
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host->ops = ops;
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host->of_node = of_node_get(of_node);
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if (host->ops->match == NULL)
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host->ops->match = default_irq_host_match;
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mutex_lock(&irq_domain_mutex);
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/* Make sure only one legacy controller can be created */
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if (revmap_type == IRQ_DOMAIN_MAP_LEGACY) {
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list_for_each_entry(h, &irq_domain_list, link) {
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if (WARN_ON(h->revmap_type == IRQ_DOMAIN_MAP_LEGACY)) {
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mutex_unlock(&irq_domain_mutex);
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of_node_put(host->of_node);
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kfree(host);
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return NULL;
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}
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}
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}
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list_add(&host->link, &irq_domain_list);
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mutex_unlock(&irq_domain_mutex);
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/* Additional setups per revmap type */
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switch(revmap_type) {
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case IRQ_DOMAIN_MAP_LEGACY:
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/* 0 is always the invalid number for legacy */
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host->inval_irq = 0;
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/* setup us as the host for all legacy interrupts */
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for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
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struct irq_data *irq_data = irq_get_irq_data(i);
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irq_data->hwirq = i;
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irq_data->domain = host;
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/* Legacy flags are left to default at this point,
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* one can then use irq_create_mapping() to
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* explicitly change them
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*/
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ops->map(host, i, i);
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/* Clear norequest flags */
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irq_clear_status_flags(i, IRQ_NOREQUEST);
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}
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break;
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case IRQ_DOMAIN_MAP_LINEAR:
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rmap = (unsigned int *)(host + 1);
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for (i = 0; i < revmap_arg; i++)
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rmap[i] = NO_IRQ;
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host->revmap_data.linear.size = revmap_arg;
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host->revmap_data.linear.revmap = rmap;
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break;
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case IRQ_DOMAIN_MAP_TREE:
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INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
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break;
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default:
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break;
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}
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pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
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return host;
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}
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struct irq_domain *irq_find_host(struct device_node *node)
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{
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struct irq_domain *h, *found = NULL;
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/* We might want to match the legacy controller last since
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* it might potentially be set to match all interrupts in
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* the absence of a device node. This isn't a problem so far
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* yet though...
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*/
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mutex_lock(&irq_domain_mutex);
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list_for_each_entry(h, &irq_domain_list, link)
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if (h->ops->match(h, node)) {
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found = h;
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break;
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}
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mutex_unlock(&irq_domain_mutex);
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return found;
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}
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EXPORT_SYMBOL_GPL(irq_find_host);
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void irq_set_default_host(struct irq_domain *host)
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{
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pr_debug("irq: Default host set to @0x%p\n", host);
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irq_default_host = host;
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}
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void irq_set_virq_count(unsigned int count)
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{
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pr_debug("irq: Trying to set virq count to %d\n", count);
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BUG_ON(count < NUM_ISA_INTERRUPTS);
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if (count < NR_IRQS)
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irq_virq_count = count;
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}
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static int irq_setup_virq(struct irq_domain *host, unsigned int virq,
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irq_hw_number_t hwirq)
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{
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struct irq_data *irq_data = irq_get_irq_data(virq);
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irq_data->hwirq = hwirq;
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irq_data->domain = host;
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if (host->ops->map(host, virq, hwirq)) {
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pr_debug("irq: -> mapping failed, freeing\n");
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irq_data->domain = NULL;
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irq_data->hwirq = 0;
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return -1;
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}
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irq_clear_status_flags(virq, IRQ_NOREQUEST);
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return 0;
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}
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unsigned int irq_create_direct_mapping(struct irq_domain *host)
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{
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unsigned int virq;
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if (host == NULL)
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host = irq_default_host;
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BUG_ON(host == NULL);
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WARN_ON(host->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
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virq = irq_alloc_desc_from(1, 0);
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if (virq == NO_IRQ) {
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pr_debug("irq: create_direct virq allocation failed\n");
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return NO_IRQ;
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}
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if (virq >= irq_virq_count) {
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pr_err("ERROR: no free irqs available below %i maximum\n",
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irq_virq_count);
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irq_free_desc(virq);
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return 0;
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}
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pr_debug("irq: create_direct obtained virq %d\n", virq);
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if (irq_setup_virq(host, virq, virq)) {
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irq_free_desc(virq);
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return NO_IRQ;
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}
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return virq;
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}
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unsigned int irq_create_mapping(struct irq_domain *host,
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irq_hw_number_t hwirq)
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{
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unsigned int virq, hint;
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pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
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/* Look for default host if nececssary */
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if (host == NULL)
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host = irq_default_host;
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if (host == NULL) {
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printk(KERN_WARNING "irq_create_mapping called for"
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" NULL host, hwirq=%lx\n", hwirq);
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WARN_ON(1);
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return NO_IRQ;
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}
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pr_debug("irq: -> using host @%p\n", host);
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/* Check if mapping already exists */
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virq = irq_find_mapping(host, hwirq);
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if (virq != NO_IRQ) {
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pr_debug("irq: -> existing mapping on virq %d\n", virq);
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return virq;
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}
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/* Get a virtual interrupt number */
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if (host->revmap_type == IRQ_DOMAIN_MAP_LEGACY) {
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/* Handle legacy */
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virq = (unsigned int)hwirq;
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if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
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return NO_IRQ;
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return virq;
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} else {
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/* Allocate a virtual interrupt number */
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hint = hwirq % irq_virq_count;
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if (hint == 0)
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hint = 1;
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virq = irq_alloc_desc_from(hint, 0);
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if (!virq)
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virq = irq_alloc_desc_from(1, 0);
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if (virq == NO_IRQ) {
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pr_debug("irq: -> virq allocation failed\n");
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return NO_IRQ;
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}
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}
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if (irq_setup_virq(host, virq, hwirq)) {
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if (host->revmap_type != IRQ_DOMAIN_MAP_LEGACY)
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irq_free_desc(virq);
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return NO_IRQ;
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}
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pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
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hwirq, host->of_node ? host->of_node->full_name : "null", virq);
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return virq;
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}
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EXPORT_SYMBOL_GPL(irq_create_mapping);
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unsigned int irq_create_of_mapping(struct device_node *controller,
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const u32 *intspec, unsigned int intsize)
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{
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struct irq_domain *host;
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irq_hw_number_t hwirq;
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unsigned int type = IRQ_TYPE_NONE;
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unsigned int virq;
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if (controller == NULL)
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host = irq_default_host;
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else
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host = irq_find_host(controller);
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if (host == NULL) {
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printk(KERN_WARNING "irq: no irq host found for %s !\n",
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controller->full_name);
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return NO_IRQ;
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}
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/* If host has no translation, then we assume interrupt line */
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if (host->ops->xlate == NULL)
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hwirq = intspec[0];
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else {
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if (host->ops->xlate(host, controller, intspec, intsize,
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&hwirq, &type))
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return NO_IRQ;
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}
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/* Create mapping */
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virq = irq_create_mapping(host, hwirq);
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if (virq == NO_IRQ)
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return virq;
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/* Set type if specified and different than the current one */
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if (type != IRQ_TYPE_NONE &&
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type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
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irq_set_irq_type(virq, type);
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return virq;
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}
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EXPORT_SYMBOL_GPL(irq_create_of_mapping);
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void irq_dispose_mapping(unsigned int virq)
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{
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struct irq_data *irq_data = irq_get_irq_data(virq);
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struct irq_domain *host;
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irq_hw_number_t hwirq;
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if (virq == NO_IRQ || !irq_data)
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return;
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host = irq_data->domain;
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if (WARN_ON(host == NULL))
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return;
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/* Never unmap legacy interrupts */
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if (host->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
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return;
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irq_set_status_flags(virq, IRQ_NOREQUEST);
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/* remove chip and handler */
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irq_set_chip_and_handler(virq, NULL, NULL);
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/* Make sure it's completed */
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synchronize_irq(virq);
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/* Tell the PIC about it */
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if (host->ops->unmap)
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host->ops->unmap(host, virq);
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smp_mb();
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/* Clear reverse map */
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hwirq = irq_data->hwirq;
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switch(host->revmap_type) {
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case IRQ_DOMAIN_MAP_LINEAR:
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if (hwirq < host->revmap_data.linear.size)
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host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
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break;
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case IRQ_DOMAIN_MAP_TREE:
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mutex_lock(&revmap_trees_mutex);
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radix_tree_delete(&host->revmap_data.tree, hwirq);
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mutex_unlock(&revmap_trees_mutex);
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break;
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}
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/* Destroy map */
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irq_data->hwirq = host->inval_irq;
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irq_free_desc(virq);
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}
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EXPORT_SYMBOL_GPL(irq_dispose_mapping);
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unsigned int irq_find_mapping(struct irq_domain *host,
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irq_hw_number_t hwirq)
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{
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unsigned int i;
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unsigned int hint = hwirq % irq_virq_count;
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/* Look for default host if nececssary */
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if (host == NULL)
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host = irq_default_host;
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if (host == NULL)
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return NO_IRQ;
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/* legacy -> bail early */
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if (host->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
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return hwirq;
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/* Slow path does a linear search of the map */
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if (hint == 0)
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hint = 1;
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i = hint;
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do {
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struct irq_data *data = irq_get_irq_data(i);
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if (data && (data->domain == host) && (data->hwirq == hwirq))
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return i;
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i++;
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if (i >= irq_virq_count)
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i = 1;
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} while(i != hint);
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return NO_IRQ;
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}
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EXPORT_SYMBOL_GPL(irq_find_mapping);
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#ifdef CONFIG_SMP
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int irq_choose_cpu(const struct cpumask *mask)
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{
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@@ -902,146 +535,11 @@ int irq_choose_cpu(const struct cpumask *mask)
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}
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#endif
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unsigned int irq_radix_revmap_lookup(struct irq_domain *host,
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irq_hw_number_t hwirq)
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{
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struct irq_data *irq_data;
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if (WARN_ON_ONCE(host->revmap_type != IRQ_DOMAIN_MAP_TREE))
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return irq_find_mapping(host, hwirq);
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/*
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* Freeing an irq can delete nodes along the path to
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* do the lookup via call_rcu.
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*/
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rcu_read_lock();
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irq_data = radix_tree_lookup(&host->revmap_data.tree, hwirq);
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rcu_read_unlock();
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/*
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* If found in radix tree, then fine.
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* Else fallback to linear lookup - this should not happen in practice
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* as it means that we failed to insert the node in the radix tree.
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*/
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return irq_data ? irq_data->irq : irq_find_mapping(host, hwirq);
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}
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void irq_radix_revmap_insert(struct irq_domain *host, unsigned int virq,
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irq_hw_number_t hwirq)
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{
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struct irq_data *irq_data = irq_get_irq_data(virq);
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if (WARN_ON(host->revmap_type != IRQ_DOMAIN_MAP_TREE))
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return;
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if (virq != NO_IRQ) {
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mutex_lock(&revmap_trees_mutex);
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radix_tree_insert(&host->revmap_data.tree, hwirq, irq_data);
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mutex_unlock(&revmap_trees_mutex);
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}
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}
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unsigned int irq_linear_revmap(struct irq_domain *host,
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irq_hw_number_t hwirq)
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{
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unsigned int *revmap;
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if (WARN_ON_ONCE(host->revmap_type != IRQ_DOMAIN_MAP_LINEAR))
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return irq_find_mapping(host, hwirq);
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/* Check revmap bounds */
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if (unlikely(hwirq >= host->revmap_data.linear.size))
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return irq_find_mapping(host, hwirq);
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/* Check if revmap was allocated */
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revmap = host->revmap_data.linear.revmap;
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if (unlikely(revmap == NULL))
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return irq_find_mapping(host, hwirq);
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/* Fill up revmap with slow path if no mapping found */
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if (unlikely(revmap[hwirq] == NO_IRQ))
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revmap[hwirq] = irq_find_mapping(host, hwirq);
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return revmap[hwirq];
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}
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int arch_early_irq_init(void)
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{
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return 0;
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}
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#ifdef CONFIG_VIRQ_DEBUG
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static int virq_debug_show(struct seq_file *m, void *private)
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{
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unsigned long flags;
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struct irq_desc *desc;
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const char *p;
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static const char none[] = "none";
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void *data;
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int i;
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seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
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"chip name", "chip data", "host name");
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for (i = 1; i < nr_irqs; i++) {
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desc = irq_to_desc(i);
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if (!desc)
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continue;
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raw_spin_lock_irqsave(&desc->lock, flags);
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if (desc->action && desc->action->handler) {
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struct irq_chip *chip;
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seq_printf(m, "%5d ", i);
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seq_printf(m, "0x%05lx ", desc->irq_data.hwirq);
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chip = irq_desc_get_chip(desc);
|
||||
if (chip && chip->name)
|
||||
p = chip->name;
|
||||
else
|
||||
p = none;
|
||||
seq_printf(m, "%-15s ", p);
|
||||
|
||||
data = irq_desc_get_chip_data(desc);
|
||||
seq_printf(m, "0x%16p ", data);
|
||||
|
||||
if (desc->irq_data.domain->of_node)
|
||||
p = desc->irq_data.domain->of_node->full_name;
|
||||
else
|
||||
p = none;
|
||||
seq_printf(m, "%s\n", p);
|
||||
}
|
||||
|
||||
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int virq_debug_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
return single_open(file, virq_debug_show, inode->i_private);
|
||||
}
|
||||
|
||||
static const struct file_operations virq_debug_fops = {
|
||||
.open = virq_debug_open,
|
||||
.read = seq_read,
|
||||
.llseek = seq_lseek,
|
||||
.release = single_release,
|
||||
};
|
||||
|
||||
static int __init irq_debugfs_init(void)
|
||||
{
|
||||
if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
|
||||
NULL, &virq_debug_fops) == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
__initcall(irq_debugfs_init);
|
||||
#endif /* CONFIG_VIRQ_DEBUG */
|
||||
|
||||
#ifdef CONFIG_PPC64
|
||||
static int __init setup_noirqdistrib(char *str)
|
||||
{
|
||||
|
||||
Reference in New Issue
Block a user