@@ -24,6 +24,7 @@
#include <linux/of_pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <linux/iommu.h>
/*
* MSI_TYPER:
@@ -64,6 +65,7 @@ struct v2m_data {
u32 nr_spis; /* The number of SPIs for MSIs */
unsigned long *bm; /* MSI vector bitmap */
u32 flags; /* v2m flags for specific implementation */
+ struct irq_chip_msi_doorbell_info doorbell_info;
};
static void gicv2m_mask_msi_irq(struct irq_data *d)
@@ -105,6 +107,14 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
msg->data -= v2m->spi_start;
}
+static struct irq_chip_msi_doorbell_info *
+gicv2m_msi_doorbell_info(struct irq_data *data)
+{
+ struct v2m_data *v2m = irq_data_get_irq_chip_data(data);
+
+ return &v2m->doorbell_info;
+}
+
static struct irq_chip gicv2m_irq_chip = {
.name = "GICv2m",
.irq_mask = irq_chip_mask_parent,
@@ -112,6 +122,7 @@ static struct irq_chip gicv2m_irq_chip = {
.irq_eoi = irq_chip_eoi_parent,
.irq_set_affinity = irq_chip_set_affinity_parent,
.irq_compose_msi_msg = gicv2m_compose_msi_msg,
+ .msi_doorbell_info = gicv2m_msi_doorbell_info,
};
static int gicv2m_irq_gic_domain_alloc(struct irq_domain *domain,
@@ -311,6 +322,11 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
memcpy(&v2m->res, res, sizeof(struct resource));
+ v2m->doorbell_info.global_doorbell = v2m->res.start;
+ v2m->doorbell_info.doorbell_is_percpu = false;
+ v2m->doorbell_info.size = sizeof(u32);
+ v2m->doorbell_info.prot = IOMMU_WRITE | IOMMU_MMIO;
+
v2m->base = ioremap(v2m->res.start, resource_size(&v2m->res));
if (!v2m->base) {
pr_err("Failed to map GICv2m resource\n");
This patch implements the msi_doorbell_info callback in the gicv2m driver. The driver now is able to return its doorbell characteristics (base, size, prot). A single doorbell is exposed. This will allow the msi layer to iommu_map this doorbell when requested. Signed-off-by: Eric Auger <eric.auger@linaro.org> --- v8 -> v9: - use global_doorbell instead of percpu_doorbells v7 -> v8: - gicv2m_msi_doorbell_info does not return a pointer to const - remove spurious !v2m check - add IOMMU_MMIO flag v7: creation --- drivers/irqchip/irq-gic-v2m.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) -- 1.9.1