diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-07-31 16:47:24 +0300 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-08-31 17:31:39 +0300 |
| commit | e57a3e2847ad74bd3285287b0effc1cfcc3d8806 (patch) | |
| tree | 7652645b81ddf8be7a28da62ace7ae5b2d9daace /drivers/irqchip/irq-gic-v3-its.c | |
| parent | 958b90d162b4ad40a7a809af5f56f3744d73ab84 (diff) | |
| download | linux-e57a3e2847ad74bd3285287b0effc1cfcc3d8806.tar.xz | |
irqchip/gic-v3-its: Allow doorbell interrupts to be injected/cleared
While the doorbell interrupts are usually driven by the HW itself,
having a way to trigger them independently has proved to be a
really useful debug feature. As it is actually very little code,
let's add it to the VPE irqchip operations.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its.c')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index f5068a95d3c4..21ee33e81c74 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -2504,12 +2504,43 @@ static void its_vpe_unmask_irq(struct irq_data *d) its_vpe_send_inv(d); } +static int its_vpe_set_irqchip_state(struct irq_data *d, + enum irqchip_irq_state which, + bool state) +{ + struct its_vpe *vpe = irq_data_get_irq_chip_data(d); + + if (which != IRQCHIP_STATE_PENDING) + return -EINVAL; + + if (gic_rdists->has_direct_lpi) { + void __iomem *rdbase; + + rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base; + if (state) { + gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_SETLPIR); + } else { + gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR); + while (gic_read_lpir(rdbase + GICR_SYNCR) & 1) + cpu_relax(); + } + } else { + if (state) + its_vpe_send_cmd(vpe, its_send_int); + else + its_vpe_send_cmd(vpe, its_send_clear); + } + + return 0; +} + static struct irq_chip its_vpe_irq_chip = { .name = "GICv4-vpe", .irq_mask = its_vpe_mask_irq, .irq_unmask = its_vpe_unmask_irq, .irq_eoi = irq_chip_eoi_parent, .irq_set_affinity = its_vpe_set_affinity, + .irq_set_irqchip_state = its_vpe_set_irqchip_state, .irq_set_vcpu_affinity = its_vpe_set_vcpu_affinity, }; |