diff --git a/include/linux/irq.h b/include/linux/irq.h
index 3b3a5b817469294f4eddc53e6f583c8900eb0013..d5ebd94822d28818a3971af59242b3f1d010871c 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -948,5 +948,9 @@ static inline u32 irq_reg_readl(struct irq_chip_generic *gc,
/* Contrary to Linux irqs, for hardware irqs the irq number 0 is valid */
#define INVALID_HWIRQ (~0UL)
irq_hw_number_t ipi_get_hwirq(unsigned int irq, unsigned int cpu);
+int __ipi_send_single(struct irq_desc *desc, unsigned int cpu);
+int __ipi_send_mask(struct irq_desc *desc, const struct cpumask *dest);
+int ipi_send_single(unsigned int virq, unsigned int cpu);
+int ipi_send_mask(unsigned int virq, const struct cpumask *dest);
#endif /* _LINUX_IRQ_H */
diff --git a/kernel/irq/ipi.c b/kernel/irq/ipi.c
index 6f34f2930bc06146c0201ab1796525c074d4d8b2..c37f34b00a115e5fd1d69a5268f031fc7cde6862 100644
--- a/kernel/irq/ipi.c
+++ b/kernel/irq/ipi.c
@@ -161,7 +161,7 @@ irq_hw_number_t ipi_get_hwirq(unsigned int irq, unsigned int cpu)
* Get the real hardware irq number if the underlying implementation
* uses a seperate irq per cpu. If the underlying implementation uses
* a single hardware irq for all cpus then the IPI send mechanism
- * needs to take care of this.
+ * needs to take care of the cpu destinations.
*/
if (irq_domain_is_ipi_per_cpu(data->domain))
data = irq_get_irq_data(irq + cpu - data->common->ipi_offset);
@@ -169,3 +169,158 @@ irq_hw_number_t ipi_get_hwirq(unsigned int irq, unsigned int cpu)
return data ? irqd_to_hwirq(data) : INVALID_HWIRQ;
}
EXPORT_SYMBOL_GPL(ipi_get_hwirq);
+
+static int ipi_send_verify(struct irq_chip *chip, struct irq_data *data,
+ const struct cpumask *dest, unsigned int cpu)
+{
+ struct cpumask *ipimask = irq_data_get_affinity_mask(data);
+
+ if (!chip || !ipimask)
+ return -EINVAL;
+
+ if (!chip->ipi_send_single && !chip->ipi_send_mask)
+ return -EINVAL;
+
+ if (cpu > nr_cpu_ids)
+ return -EINVAL;
+
+ if (dest) {
+ if (!cpumask_subset(dest, ipimask))
+ return -EINVAL;
+ } else {
+ if (!cpumask_test_cpu(cpu, ipimask))
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/**
+ * __ipi_send_single - send an IPI to a target Linux SMP CPU
+ * @desc: pointer to irq_desc of the IRQ
+ * @cpu: destination CPU, must in the destination mask passed to
+ * irq_reserve_ipi()
+ *
+ * This function is for architecture or core code to speed up IPI sending. Not
+ * usable from driver code.
+ *
+ * Returns zero on success and negative error number on failure.
+ */
+int __ipi_send_single(struct irq_desc *desc, unsigned int cpu)
+{
+ struct irq_data *data = irq_desc_get_irq_data(desc);
+ struct irq_chip *chip = irq_data_get_irq_chip(data);
+
+#ifdef DEBUG
+ /*
+ * Minimise the overhead by omitting the checks for Linux SMP IPIs.
+ * Since the callers should be arch or core code which is generally
+ * trusted, only check for errors when debugging.
+ */
+ if (WARN_ON_ONCE(ipi_send_verify(chip, data, NULL, cpu)))
+ return -EINVAL;
+#endif
+ if (!chip->ipi_send_single) {
+ chip->ipi_send_mask(data, cpumask_of(cpu));
+ return 0;
+ }
+
+ /* FIXME: Store this information in irqdata flags */
+ if (irq_domain_is_ipi_per_cpu(data->domain) &&
+ cpu != data->common->ipi_offset) {
+ /* use the correct data for that cpu */
+ unsigned irq = data->irq + cpu - data->common->ipi_offset;
+
+ data = irq_get_irq_data(irq);
+ }
+ chip->ipi_send_single(data, cpu);
+ return 0;
+}
+
+/**
+ * ipi_send_mask - send an IPI to target Linux SMP CPU(s)
+ * @desc: pointer to irq_desc of the IRQ
+ * @dest: dest CPU(s), must be a subset of the mask passed to
+ * irq_reserve_ipi()
+ *
+ * This function is for architecture or core code to speed up IPI sending. Not
+ * usable from driver code.
+ *
+ * Returns zero on success and negative error number on failure.
+ */
+int __ipi_send_mask(struct irq_desc *desc, const struct cpumask *dest)
+{
+ struct irq_data *data = irq_desc_get_irq_data(desc);
+ struct irq_chip *chip = irq_data_get_irq_chip(data);
+ unsigned int cpu;
+
+#ifdef DEBUG
+ /*
+ * Minimise the overhead by omitting the checks for Linux SMP IPIs.
+ * Since the callers should be arch or core code which is generally
+ * trusted, only check for errors when debugging.
+ */
+ if (WARN_ON_ONCE(ipi_send_verify(chip, data, dest, 0)))
+ return -EINVAL;
+#endif
+ if (chip->ipi_send_mask) {
+ chip->ipi_send_mask(data, dest);
+ return 0;
+ }
+
+ if (irq_domain_is_ipi_per_cpu(data->domain)) {
+ unsigned int base = data->irq;
+
+ for_each_cpu(cpu, dest) {
+ unsigned irq = base + cpu - data->common->ipi_offset;
+
+ data = irq_get_irq_data(irq);
+ chip->ipi_send_single(data, cpu);
+ }
+ } else {
+ for_each_cpu(cpu, dest)
+ chip->ipi_send_single(data, cpu);
+ }
+ return 0;
+}
+
+/**
+ * ipi_send_single - Send an IPI to a single CPU
+ * @virq: linux irq number from irq_reserve_ipi()
+ * @cpu: destination CPU, must in the destination mask passed to
+ * irq_reserve_ipi()
+ *
+ * Returns zero on success and negative error number on failure.
+ */
+int ipi_send_single(unsigned int virq, unsigned int cpu)
+{
+ struct irq_desc *desc = irq_to_desc(virq);
+ struct irq_data *data = desc ? irq_desc_get_irq_data(desc) : NULL;
+ struct irq_chip *chip = data ? irq_data_get_irq_chip(data) : NULL;
+
+ if (WARN_ON_ONCE(ipi_send_verify(chip, data, NULL, cpu)))
+ return -EINVAL;
+
+ return __ipi_send_single(desc, cpu);
+}
+EXPORT_SYMBOL_GPL(ipi_send_single);
+
+/**
+ * ipi_send_mask - Send an IPI to target CPU(s)
+ * @virq: linux irq number from irq_reserve_ipi()
+ * @dest: dest CPU(s), must be a subset of the mask passed to
+ * irq_reserve_ipi()
+ *
+ * Returns zero on success and negative error number on failure.
+ */
+int ipi_send_mask(unsigned int virq, const struct cpumask *dest)
+{
+ struct irq_desc *desc = irq_to_desc(virq);
+ struct irq_data *data = desc ? irq_desc_get_irq_data(desc) : NULL;
+ struct irq_chip *chip = data ? irq_data_get_irq_chip(data) : NULL;
+
+ if (WARN_ON_ONCE(ipi_send_verify(chip, data, dest, 0)))
+ return -EINVAL;
+
+ return __ipi_send_mask(desc, dest);
+}
+EXPORT_SYMBOL_GPL(ipi_send_mask);