diff options
| author |   Marc Zyngier <marc.zyngier@arm.com> | 2015-11-23 08:26:06 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2015-12-16 15:29:44 +0000 |
| commit | 2145ac9310b60c1c11294b7bea10fe154009be1d (patch) | |
| tree | 8f38f1ae3609004675fbfd55a721d3969f67e670 /kernel/irq | |
| parent | genirq/msi: Make the .prepare callback reusable (diff) | |
| download | linux-dev-2145ac9310b60c1c11294b7bea10fe154009be1d.tar.xz linux-dev-2145ac9310b60c1c11294b7bea10fe154009be1d.zip | |
genirq/msi: Add msi_domain_populate_irqs
To be able to allocate interrupts from the MSI layer down,
add a new msi_domain_populate_irqs entry point.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/msi.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 9a85613d4227..15b249e7c673 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -266,6 +266,46 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev, return ret; } +int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev, + int virq, int nvec, msi_alloc_info_t *arg) +{ + struct msi_domain_info *info = domain->host_data; + struct msi_domain_ops *ops = info->ops; + struct msi_desc *desc; + int ret = 0; + + for_each_msi_entry(desc, dev) { + /* Don't even try the multi-MSI brain damage. */ + if (WARN_ON(!desc->irq || desc->nvec_used != 1)) { + ret = -EINVAL; + break; + } + + if (!(desc->irq >= virq && desc->irq < (virq + nvec))) + continue; + + ops->set_desc(arg, desc); + /* Assumes the domain mutex is held! */ + ret = irq_domain_alloc_irqs_recursive(domain, virq, 1, arg); + if (ret) + break; + + irq_set_msi_desc_off(virq, 0, desc); + } + + if (ret) { + /* Mop up the damage */ + for_each_msi_entry(desc, dev) { + if (!(desc->irq >= virq && desc->irq < (virq + nvec))) + continue; + + irq_domain_free_irqs_common(domain, desc->irq, 1); + } + } + + return ret; +} + /** * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain * @domain: The domain to allocate from |