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irqchip/gic-v3-its: Add VLPI configuration handling 

When a VLPI is reconfigured (enabled, disabled, change in priority),
the full configuration byte must be written, and the caches invalidated.

Also, when using the irq_mask/irq_unmask methods, it is necessary
to disable the doorbell for that particular interrupt (by mapping it
to 1023) on top of clearing the Enable bit.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-12-20 09:54:57 +00:00
parent d011e4e654
commit 015ec0386a
1 changed files with 70 additions and 5 deletions
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75
drivers/irqchip/irq-gic-v3-its.c
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@ -812,18 +812,26 @@ static inline u32 its_get_event_id(struct irq_data *d)
return d->hwirq - its_dev->event_map.lpi_base;
}
static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
irq_hw_number_t hwirq = d->hwirq;
irq_hw_number_t hwirq;
struct page *prop_page;
u8 *cfg;
prop_page = gic_rdists->prop_page;
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);
prop_page = its_dev->event_map.vm->vprop_page;
hwirq = its_dev->event_map.vlpi_maps[event].vintid;
} else {
prop_page = gic_rdists->prop_page;
hwirq = d->hwirq;
}
cfg = page_address(prop_page) + hwirq - 8192;
*cfg &= ~clr;
*cfg |= set;
*cfg |= set | LPI_PROP_GROUP1;
/*
* Make the above write visible to the redistributors.
@ -834,16 +842,52 @@ static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
gic_flush_dcache_to_poc(cfg, sizeof(*cfg));
else
dsb(ishst);
}
static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
lpi_write_config(d, clr, set);
its_send_inv(its_dev, its_get_event_id(d));
}
static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
u32 event = its_get_event_id(d);
if (its_dev->event_map.vlpi_maps[event].db_enabled == enable)
return;
its_dev->event_map.vlpi_maps[event].db_enabled = enable;
/*
* More fun with the architecture:
*
* Ideally, we'd issue a VMAPTI to set the doorbell to its LPI
* value or to 1023, depending on the enable bit. But that
* would be issueing a mapping for an /existing/ DevID+EventID
* pair, which is UNPREDICTABLE. Instead, let's issue a VMOVI
* to the /same/ vPE, using this opportunity to adjust the
* doorbell. Mouahahahaha. We loves it, Precious.
*/
its_send_vmovi(its_dev, event);
}
static void its_mask_irq(struct irq_data *d)
{
if (irqd_is_forwarded_to_vcpu(d))
its_vlpi_set_doorbell(d, false);
lpi_update_config(d, LPI_PROP_ENABLED, 0);
}
static void its_unmask_irq(struct irq_data *d)
{
if (irqd_is_forwarded_to_vcpu(d))
its_vlpi_set_doorbell(d, true);
lpi_update_config(d, 0, LPI_PROP_ENABLED);
}
@ -856,6 +900,10 @@ static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
struct its_collection *target_col;
u32 id = its_get_event_id(d);
/* A forwarded interrupt should use irq_set_vcpu_affinity */
if (irqd_is_forwarded_to_vcpu(d))
return -EINVAL;
/* lpi cannot be routed to a redistributor that is on a foreign node */
if (its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) {
if (its_dev->its->numa_node >= 0) {
@ -1024,6 +1072,22 @@ out:
return ret;
}
static int its_vlpi_prop_update(struct irq_data *d, struct its_cmd_info *info)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d))
return -EINVAL;
if (info->cmd_type == PROP_UPDATE_AND_INV_VLPI)
lpi_update_config(d, 0xff, info->config);
else
lpi_write_config(d, 0xff, info->config);
its_vlpi_set_doorbell(d, !!(info->config & LPI_PROP_ENABLED));
return 0;
}
static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
@ -1046,6 +1110,7 @@ static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
case PROP_UPDATE_VLPI:
case PROP_UPDATE_AND_INV_VLPI:
return its_vlpi_prop_update(d, info);
default:
return -EINVAL;