On Thu, 2021-03-11 at 08:19 +0000, Marc Zyngier wrote:

On 2021-03-11 00:05, Pali Rohár wrote:

quoted

On Wednesday 24 February 2021 14:11:30 Jianjun Wang wrote:

quoted

+static int mtk_msi_bottom_domain_alloc(struct irq_domain *domain,
+				       unsigned int virq, unsigned int nr_irqs,
+				       void *arg)
+{
+	struct mtk_pcie_port *port = domain->host_data;
+	struct mtk_msi_set *msi_set;
+	int i, hwirq, set_idx;
+
+	mutex_lock(&port->lock);
+
+	hwirq = bitmap_find_free_region(port->msi_irq_in_use, 
PCIE_MSI_IRQS_NUM,
+					order_base_2(nr_irqs));
+
+	mutex_unlock(&port->lock);
+
+	if (hwirq < 0)
+		return -ENOSPC;
+
+	set_idx = hwirq / PCIE_MSI_IRQS_PER_SET;
+	msi_set = &port->msi_sets[set_idx];
+
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_info(domain, virq + i, hwirq + i,
+				    &mtk_msi_bottom_irq_chip, msi_set,
+				    handle_edge_irq, NULL, NULL);
+
+	return 0;
+}
+
+static void mtk_msi_bottom_domain_free(struct irq_domain *domain,
+				       unsigned int virq, unsigned int nr_irqs)
+{
+	struct mtk_pcie_port *port = domain->host_data;
+	struct irq_data *data = irq_domain_get_irq_data(domain, virq);
+
+	mutex_lock(&port->lock);
+
+	bitmap_clear(port->msi_irq_in_use, data->hwirq, nr_irqs);

Marc, should not be there bitmap_release_region() with order_base_2()?

bitmap_release_region(port->msi_irq_in_use, data->hwirq, 
order_base_2(nr_irqs));

Because mtk_msi_bottom_domain_alloc() is allocating
order_base_2(nr_irqs) interrupts, not only nr_irqs.

Indeed, good catch.

I will fix it in the next version, thanks for your review.

Thanks,

         M.

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