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| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-10-26 10:44:07 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-11-02 15:55:44 +0000 |
| commit | d4d7b4ad2f05c03fb25252aea66f9f3cd7cfbe06 (patch) | |
| tree | 65b1f84da956429e65ddd0eb1da2b9930834bcb2 /drivers/irqchip | |
| parent | 05f3647359f8bf44e000122cee6a848f5129e2e3 (diff) | |
| download | op-kernel-dev-d4d7b4ad2f05c03fb25252aea66f9f3cd7cfbe06.zip op-kernel-dev-d4d7b4ad2f05c03fb25252aea66f9f3cd7cfbe06.tar.gz | |
irqchip/gic-v3-its: Setup VLPI properties at map time
So far, we require the hypervisor to update the VLPI properties
once the the VLPI mapping has been established. While this
makes it easy for the ITS driver, it creates a window where
an incoming interrupt can be delivered with an unknown set
of properties. Not very nice.
Instead, let's add a "properties" field to the mapping structure,
and use that to configure the VLPI before it actually gets mapped.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 6a74f04..29b2ff5 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1008,9 +1008,15 @@ static void lpi_write_config(struct irq_data *d, u8 clr, u8 set) if (irqd_is_forwarded_to_vcpu(d)) { struct its_device *its_dev = irq_data_get_irq_chip_data(d); u32 event = its_get_event_id(d); + struct its_vlpi_map *map; prop_page = its_dev->event_map.vm->vprop_page; - hwirq = its_dev->event_map.vlpi_maps[event].vintid; + map = &its_dev->event_map.vlpi_maps[event]; + hwirq = map->vintid; + + /* Remember the updated property */ + map->properties &= ~clr; + map->properties |= set | LPI_PROP_GROUP1; } else { prop_page = gic_rdists->prop_page; hwirq = d->hwirq; @@ -1249,12 +1255,20 @@ static int its_vlpi_map(struct irq_data *d, struct its_cmd_info *info) /* Ensure all the VPEs are mapped on this ITS */ its_map_vm(its_dev->its, info->map->vm); + /* + * Flag the interrupt as forwarded so that we can + * start poking the virtual property table. + */ + irqd_set_forwarded_to_vcpu(d); + + /* Write out the property to the prop table */ + lpi_write_config(d, 0xff, info->map->properties); + /* Drop the physical mapping */ its_send_discard(its_dev, event); /* and install the virtual one */ its_send_vmapti(its_dev, event); - irqd_set_forwarded_to_vcpu(d); /* Increment the number of VLPIs */ its_dev->event_map.nr_vlpis++; |
