Commit 737be747 authored by Julien Grall's avatar Julien Grall Committed by Marc Zyngier

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: default avatarJulien Grall <julien.grall@arm.com>
Reviewed-by: default avatarEric Auger <eric.auger@redhat.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent ece6e6f0
...@@ -110,7 +110,7 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) ...@@ -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) if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
msg->data -= v2m->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 = { static struct irq_chip gicv2m_irq_chip = {
...@@ -167,6 +167,7 @@ static void gicv2m_unalloc_msi(struct v2m_data *v2m, unsigned int hwirq, ...@@ -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, static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *args) unsigned int nr_irqs, void *args)
{ {
msi_alloc_info_t *info = args;
struct v2m_data *v2m = NULL, *tmp; struct v2m_data *v2m = NULL, *tmp;
int hwirq, offset, i, err = 0; int hwirq, offset, i, err = 0;
...@@ -186,6 +187,11 @@ static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, ...@@ -186,6 +187,11 @@ static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
hwirq = v2m->spi_start + offset; 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++) { for (i = 0; i < nr_irqs; i++) {
err = gicv2m_irq_gic_domain_alloc(domain, virq + i, hwirq + i); err = gicv2m_irq_gic_domain_alloc(domain, virq + i, hwirq + i);
if (err) if (err)
......
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