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@@ -1,14 +1,612 @@
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+#include <linux/debugfs.h>
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+#include <linux/hardirq.h>
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+#include <linux/interrupt.h>
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#include <linux/irq.h>
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+#include <linux/irqdesc.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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+#include <linux/seq_file.h>
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#include <linux/slab.h>
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+#include <linux/smp.h>
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+#include <linux/fs.h>
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static LIST_HEAD(irq_domain_list);
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static DEFINE_MUTEX(irq_domain_mutex);
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+#ifdef CONFIG_PPC
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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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+
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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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+
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+/**
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+ * irq_alloc_host() - Allocate a new irq_domain data structure
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+ * @of_node: optional device-tree node of the interrupt controller
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+ * @revmap_type: type of reverse mapping to use
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+ * @revmap_arg: for IRQ_DOMAIN_MAP_LINEAR linear only: size of the map
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+ * @ops: map/unmap host callbacks
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+ * @inval_irq: provide a hw number in that host space that is always invalid
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+ *
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+ * Allocates and initialize and irq_domain structure. Note that in the case of
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+ * IRQ_DOMAIN_MAP_LEGACY, the map() callback will be called before this returns
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+ * for all legacy interrupts except 0 (which is always the invalid irq for
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+ * a legacy controller). For a IRQ_DOMAIN_MAP_LINEAR, the map is allocated by
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+ * this call as well. For a IRQ_DOMAIN_MAP_TREE, the radix tree will be
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+ * allocated later during boot automatically (the reverse mapping will use the
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+ * slow path until that happens).
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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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+
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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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+
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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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+
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+ if (host->ops->match == NULL)
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+ host->ops->match = default_irq_host_match;
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+
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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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+
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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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+
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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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+
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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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+
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+ pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
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+
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+ return host;
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+}
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+
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+/**
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+ * irq_find_host() - Locates a domain for a given device node
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+ * @node: device-tree node of the interrupt controller
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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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+
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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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+
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+/**
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+ * irq_set_default_host() - Set a "default" irq domain
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+ * @host: default host pointer
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+ *
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+ * For convenience, it's possible to set a "default" domain that will be used
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+ * whenever NULL is passed to irq_create_mapping(). It makes life easier for
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+ * platforms that want to manipulate a few hard coded interrupt numbers that
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+ * aren't properly represented in the device-tree.
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+ */
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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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+
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+ irq_default_host = host;
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+}
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+
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+/**
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+ * irq_set_virq_count() - Set the maximum number of linux irqs
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+ * @count: number of linux irqs, capped with NR_IRQS
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+ *
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+ * This is mainly for use by platforms like iSeries who want to program
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+ * the virtual irq number in the controller to avoid the reverse mapping
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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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+
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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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+
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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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+
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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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+
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+ irq_clear_status_flags(virq, IRQ_NOREQUEST);
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+
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+ return 0;
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+}
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+
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+/**
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+ * irq_create_direct_mapping() - Allocate an irq for direct mapping
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+ * @host: domain to allocate the irq for or NULL for default host
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+ *
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+ * This routine is used for irq controllers which can choose the hardware
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+ * interrupt numbers they generate. In such a case it's simplest to use
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+ * the linux irq as the hardware interrupt number.
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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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+
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+ if (host == NULL)
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+ host = irq_default_host;
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+
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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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+
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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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+
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+ pr_debug("irq: create_direct obtained virq %d\n", virq);
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+
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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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+
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+ return virq;
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+}
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+
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+/**
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+ * irq_create_mapping() - Map a hardware interrupt into linux irq space
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+ * @host: host owning this hardware interrupt or NULL for default host
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+ * @hwirq: hardware irq number in that host space
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+ *
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+ * Only one mapping per hardware interrupt is permitted. Returns a linux
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+ * irq number.
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+ * If the sense/trigger is to be specified, set_irq_type() should be called
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+ * on the number returned from that call.
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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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+
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+ pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
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+
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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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+
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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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+
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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++;
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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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+
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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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+
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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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+
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+ return virq;
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+}
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+EXPORT_SYMBOL_GPL(irq_create_mapping);
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+/**
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+ * irq_dispose_mapping() - Unmap an interrupt
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+ * @virq: linux irq number of the interrupt to unmap
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+ */
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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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+
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+ if (virq == NO_IRQ || !irq_data)
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+ return;
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+
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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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+
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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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+
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+ irq_set_status_flags(virq, IRQ_NOREQUEST);
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+
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+ /* remove chip and handler */
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+ irq_set_chip_and_handler(virq, NULL, NULL);
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+
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+ /* Make sure it's completed */
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+ synchronize_irq(virq);
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+
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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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+
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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 */
|
|
|
+ irq_data->hwirq = host->inval_irq;
|
|
|
+
|
|
|
+ irq_free_desc(virq);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(irq_dispose_mapping);
|
|
|
+
|
|
|
+/**
|
|
|
+ * irq_find_mapping() - Find a linux irq from an hw irq number.
|
|
|
+ * @host: domain owning this hardware interrupt
|
|
|
+ * @hwirq: hardware irq number in that host space
|
|
|
+ *
|
|
|
+ * This is a slow path, for use by generic code. It's expected that an
|
|
|
+ * irq controller implementation directly calls the appropriate low level
|
|
|
+ * mapping function.
|
|
|
+ */
|
|
|
+unsigned int irq_find_mapping(struct irq_domain *host,
|
|
|
+ irq_hw_number_t hwirq)
|
|
|
+{
|
|
|
+ unsigned int i;
|
|
|
+ unsigned int hint = hwirq % irq_virq_count;
|
|
|
+
|
|
|
+ /* Look for default host if nececssary */
|
|
|
+ if (host == NULL)
|
|
|
+ host = irq_default_host;
|
|
|
+ if (host == NULL)
|
|
|
+ return NO_IRQ;
|
|
|
+
|
|
|
+ /* legacy -> bail early */
|
|
|
+ if (host->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
|
|
|
+ return hwirq;
|
|
|
+
|
|
|
+ /* Slow path does a linear search of the map */
|
|
|
+ if (hint == 0)
|
|
|
+ hint = 1;
|
|
|
+ i = hint;
|
|
|
+ do {
|
|
|
+ struct irq_data *data = irq_get_irq_data(i);
|
|
|
+ if (data && (data->domain == host) && (data->hwirq == hwirq))
|
|
|
+ return i;
|
|
|
+ i++;
|
|
|
+ if (i >= irq_virq_count)
|
|
|
+ i = 1;
|
|
|
+ } while(i != hint);
|
|
|
+ return NO_IRQ;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(irq_find_mapping);
|
|
|
+
|
|
|
+/**
|
|
|
+ * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number.
|
|
|
+ * @host: host owning this hardware interrupt
|
|
|
+ * @hwirq: hardware irq number in that host space
|
|
|
+ *
|
|
|
+ * This is a fast path, for use by irq controller code that uses radix tree
|
|
|
+ * revmaps
|
|
|
+ */
|
|
|
+unsigned int irq_radix_revmap_lookup(struct irq_domain *host,
|
|
|
+ irq_hw_number_t hwirq)
|
|
|
+{
|
|
|
+ struct irq_data *irq_data;
|
|
|
+
|
|
|
+ if (WARN_ON_ONCE(host->revmap_type != IRQ_DOMAIN_MAP_TREE))
|
|
|
+ return irq_find_mapping(host, hwirq);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Freeing an irq can delete nodes along the path to
|
|
|
+ * do the lookup via call_rcu.
|
|
|
+ */
|
|
|
+ rcu_read_lock();
|
|
|
+ irq_data = radix_tree_lookup(&host->revmap_data.tree, hwirq);
|
|
|
+ rcu_read_unlock();
|
|
|
+
|
|
|
+ /*
|
|
|
+ * If found in radix tree, then fine.
|
|
|
+ * Else fallback to linear lookup - this should not happen in practice
|
|
|
+ * as it means that we failed to insert the node in the radix tree.
|
|
|
+ */
|
|
|
+ return irq_data ? irq_data->irq : irq_find_mapping(host, hwirq);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping.
|
|
|
+ * @host: host owning this hardware interrupt
|
|
|
+ * @virq: linux irq number
|
|
|
+ * @hwirq: hardware irq number in that host space
|
|
|
+ *
|
|
|
+ * This is for use by irq controllers that use a radix tree reverse
|
|
|
+ * mapping for fast lookup.
|
|
|
+ */
|
|
|
+void irq_radix_revmap_insert(struct irq_domain *host, unsigned int virq,
|
|
|
+ irq_hw_number_t hwirq)
|
|
|
+{
|
|
|
+ struct irq_data *irq_data = irq_get_irq_data(virq);
|
|
|
+
|
|
|
+ if (WARN_ON(host->revmap_type != IRQ_DOMAIN_MAP_TREE))
|
|
|
+ return;
|
|
|
+
|
|
|
+ if (virq != NO_IRQ) {
|
|
|
+ mutex_lock(&revmap_trees_mutex);
|
|
|
+ radix_tree_insert(&host->revmap_data.tree, hwirq, irq_data);
|
|
|
+ mutex_unlock(&revmap_trees_mutex);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * irq_linear_revmap() - Find a linux irq from a hw irq number.
|
|
|
+ * @host: host owning this hardware interrupt
|
|
|
+ * @hwirq: hardware irq number in that host space
|
|
|
+ *
|
|
|
+ * This is a fast path, for use by irq controller code that uses linear
|
|
|
+ * revmaps. It does fallback to the slow path if the revmap doesn't exist
|
|
|
+ * yet and will create the revmap entry with appropriate locking
|
|
|
+ */
|
|
|
+unsigned int irq_linear_revmap(struct irq_domain *host,
|
|
|
+ irq_hw_number_t hwirq)
|
|
|
+{
|
|
|
+ unsigned int *revmap;
|
|
|
+
|
|
|
+ if (WARN_ON_ONCE(host->revmap_type != IRQ_DOMAIN_MAP_LINEAR))
|
|
|
+ return irq_find_mapping(host, hwirq);
|
|
|
+
|
|
|
+ /* Check revmap bounds */
|
|
|
+ if (unlikely(hwirq >= host->revmap_data.linear.size))
|
|
|
+ return irq_find_mapping(host, hwirq);
|
|
|
+
|
|
|
+ /* Check if revmap was allocated */
|
|
|
+ revmap = host->revmap_data.linear.revmap;
|
|
|
+ if (unlikely(revmap == NULL))
|
|
|
+ return irq_find_mapping(host, hwirq);
|
|
|
+
|
|
|
+ /* Fill up revmap with slow path if no mapping found */
|
|
|
+ if (unlikely(revmap[hwirq] == NO_IRQ))
|
|
|
+ revmap[hwirq] = irq_find_mapping(host, hwirq);
|
|
|
+
|
|
|
+ return revmap[hwirq];
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef CONFIG_VIRQ_DEBUG
|
|
|
+static int virq_debug_show(struct seq_file *m, void *private)
|
|
|
+{
|
|
|
+ unsigned long flags;
|
|
|
+ struct irq_desc *desc;
|
|
|
+ const char *p;
|
|
|
+ static const char none[] = "none";
|
|
|
+ void *data;
|
|
|
+ int i;
|
|
|
+
|
|
|
+ seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
|
|
|
+ "chip name", "chip data", "host name");
|
|
|
+
|
|
|
+ for (i = 1; i < nr_irqs; i++) {
|
|
|
+ desc = irq_to_desc(i);
|
|
|
+ if (!desc)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ raw_spin_lock_irqsave(&desc->lock, flags);
|
|
|
+
|
|
|
+ if (desc->action && desc->action->handler) {
|
|
|
+ struct irq_chip *chip;
|
|
|
+
|
|
|
+ seq_printf(m, "%5d ", i);
|
|
|
+ seq_printf(m, "0x%05lx ", desc->irq_data.hwirq);
|
|
|
+
|
|
|
+ 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 */
|
|
|
+
|
|
|
+#else /* CONFIG_PPC */
|
|
|
+
|
|
|
/**
|
|
|
* irq_domain_add() - Register an irq_domain
|
|
|
* @domain: ptr to initialized irq_domain structure
|
|
|
@@ -185,3 +783,5 @@ struct irq_domain_ops irq_domain_simple_ops = {
|
|
|
#endif /* CONFIG_OF_IRQ */
|
|
|
};
|
|
|
EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
|
|
|
+
|
|
|
+#endif /* !CONFIG_PPC */
|
Grant Likely