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Date: Wed, 4 May 2016 15:18:12 +0000 From: Eric Auger <eric.auger@...aro.org> To: eric.auger@...com, eric.auger@...aro.org, robin.murphy@....com, alex.williamson@...hat.com, will.deacon@....com, joro@...tes.org, tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com, christoffer.dall@...aro.org, linux-arm-kernel@...ts.infradead.org Cc: patches@...aro.org, linux-kernel@...r.kernel.org, Bharat.Bhushan@...escale.com, pranav.sawargaonkar@...il.com, p.fedin@...sung.com, iommu@...ts.linux-foundation.org, Jean-Philippe.Brucker@....com, julien.grall@....com, yehuday@...vell.com Subject: [PATCH v9 6/8] irqchip/gicv2m: implement msi_doorbell_info callback 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@...aro.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(+) diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c index 28f047c..c77c41f 100644 --- a/drivers/irqchip/irq-gic-v2m.c +++ b/drivers/irqchip/irq-gic-v2m.c @@ -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"); -- 1.9.1
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