From 737be74710f30e611ee871f7b4f47975d1c6f71a Mon Sep 17 00:00:00 2001 From: Julien Grall Date: Wed, 1 May 2019 14:58:20 +0100 Subject: 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 Reviewed-by: Eric Auger Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-gic-v2m.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'drivers/irqchip/irq-gic-v2m.c') diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c index f5fe0100f9ff..4359f0583377 100644 --- 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) -- cgit v1.2.3