From 44bb7e243bd4b4e5c79de2452cd9762582f58925 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Mon, 12 Sep 2016 17:13:59 +0100 Subject: iommu/dma: Add support for mapping MSIs When an MSI doorbell is located downstream of an IOMMU, attaching devices to a DMA ops domain and switching on translation leads to a rude shock when their attempt to write to the physical address returned by the irqchip driver faults (or worse, writes into some already-mapped buffer) and no interrupt is forthcoming. Address this by adding a hook for relevant irqchip drivers to call from their compose_msi_msg() callback, to swizzle the physical address with an appropriatly-mapped IOVA for any device attached to one of our DMA ops domains. Acked-by: Thomas Gleixner Acked-by: Marc Zyngier Signed-off-by: Robin Murphy Signed-off-by: Will Deacon --- drivers/irqchip/irq-gic-v2m.c | 3 +++ drivers/irqchip/irq-gic-v3-its.c | 3 +++ 2 files changed, 6 insertions(+) (limited to 'drivers/irqchip') diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c index 35eb7ac5d21f..863e073c6f7f 100644 --- a/drivers/irqchip/irq-gic-v2m.c +++ b/drivers/irqchip/irq-gic-v2m.c @@ -16,6 +16,7 @@ #define pr_fmt(fmt) "GICv2m: " fmt #include +#include #include #include #include @@ -108,6 +109,8 @@ 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); } static struct irq_chip gicv2m_irq_chip = { diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 36b9c28a5c91..98ff669d5962 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -655,6 +656,8 @@ static void its_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg) msg->address_lo = addr & ((1UL << 32) - 1); msg->address_hi = addr >> 32; msg->data = its_get_event_id(d); + + iommu_dma_map_msi_msg(d->irq, msg); } static struct irq_chip its_irq_chip = { -- cgit v1.2.3-58-ga151