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Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/msi.c35
1 files changed, 27 insertions, 8 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index edb987b2c58d..9ba954331171 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -339,6 +339,13 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
return ret;
}
+static bool msi_check_reservation_mode(struct msi_domain_info *info)
+{
+ if (!(info->flags & MSI_FLAG_MUST_REACTIVATE))
+ return false;
+ return true;
+}
+
/**
* msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain
* @domain: The domain to allocate from
@@ -353,9 +360,11 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
- msi_alloc_info_t arg;
+ struct irq_data *irq_data;
struct msi_desc *desc;
+ msi_alloc_info_t arg;
int i, ret, virq;
+ bool can_reserve;
ret = msi_domain_prepare_irqs(domain, dev, nvec, &arg);
if (ret)
@@ -385,6 +394,8 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
if (ops->msi_finish)
ops->msi_finish(&arg, 0);
+ can_reserve = msi_check_reservation_mode(info);
+
for_each_msi_entry(desc, dev) {
virq = desc->irq;
if (desc->nvec_used == 1)
@@ -397,15 +408,23 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
* the MSI entries before the PCI layer enables MSI in the
* card. Otherwise the card latches a random msi message.
*/
- if (info->flags & MSI_FLAG_ACTIVATE_EARLY) {
- struct irq_data *irq_data;
+ if (!(info->flags & MSI_FLAG_ACTIVATE_EARLY))
+ continue;
+ irq_data = irq_domain_get_irq_data(domain, desc->irq);
+ ret = irq_domain_activate_irq(irq_data, true);
+ if (ret)
+ goto cleanup;
+ }
+
+ /*
+ * If these interrupts use reservation mode, clear the activated bit
+ * so request_irq() will assign the final vector.
+ */
+ if (can_reserve) {
+ for_each_msi_entry(desc, dev) {
irq_data = irq_domain_get_irq_data(domain, desc->irq);
- ret = irq_domain_activate_irq(irq_data, true);
- if (ret)
- goto cleanup;
- if (info->flags & MSI_FLAG_MUST_REACTIVATE)
- irqd_clr_activated(irq_data);
+ irqd_clr_activated(irq_data);
}
}
return 0;