irqchip/gicv2m: Don't map the MSI page in gicv2m_compose_msi_msg()

gicv2m_compose_msi_msg() may be called from non-preemptible context.
However, on RT, iommu_dma_map_msi_msg() requires to be called from a
preemptible context.

A recent change split iommu_dma_map_msi_msg() in two new functions:
one that should be called in preemptible context, the other does
not have any requirement.

The GICv2m driver is reworked to avoid executing preemptible code in
non-preemptible context. This can be achieved by preparing the MSI
mapping when allocating the MSI interrupt.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index f5fe0100f9ffd043d251d96ce473775bfdafd3b4..4359f05833776b3e76d63e1d1946fd2500e71f5d 100644 (file)
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -110,7 +110,7 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
        if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
                msg->data -= v2m->spi_offset;
 
-       iommu_dma_map_msi_msg(data->irq, msg);
+       iommu_dma_compose_msi_msg(irq_data_get_msi_desc(data), msg);
 }
 
 static struct irq_chip gicv2m_irq_chip = {
@@ -167,6 +167,7 @@ static void gicv2m_unalloc_msi(struct v2m_data *v2m, unsigned int hwirq,
 static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
                                   unsigned int nr_irqs, void *args)
 {
+       msi_alloc_info_t *info = args;
        struct v2m_data *v2m = NULL, *tmp;
        int hwirq, offset, i, err = 0;
 
@@ -186,6 +187,11 @@ static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 
        hwirq = v2m->spi_start + offset;
 
+       err = iommu_dma_prepare_msi(info->desc,
+                                   v2m->res.start + V2M_MSI_SETSPI_NS);
+       if (err)
+               return err;
+
        for (i = 0; i < nr_irqs; i++) {
                err = gicv2m_irq_gic_domain_alloc(domain, virq + i, hwirq + i);
                if (err)