Hi Zenghui,
Thanks for this.
On 2020-01-22 08:56, Zenghui Yu wrote:
When we're writing config for the doorbell interrupt, get_vlpi_map()
will
get confused by doorbell's d->parent_data hack and find the wrong
its_dev
as chip data and the wrong event.
Fix this issue by making sure no doorbells will be involved before
invoking
get_vlpi_map(), which restore some of the logic in lpi_write_config().
Fixes: c1d4d5cd203c ("irqchip/gic-v3-its: Add its_vlpi_map helpers")
Signed-off-by: Zenghui Yu <yuzenghui@xxxxxxxxxx>
---
This is based on mainline and can't be directly applied to the current
irqchip-next.
drivers/irqchip/irq-gic-v3-its.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c
b/drivers/irqchip/irq-gic-v3-its.c
index e05673bcd52b..cc8a4fcbd6d6 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1181,12 +1181,13 @@ static struct its_vlpi_map
*get_vlpi_map(struct irq_data *d)
static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)
{
- struct its_vlpi_map *map = get_vlpi_map(d);
irq_hw_number_t hwirq;
void *va;
u8 *cfg;
- if (map) {
+ if (irqd_is_forwarded_to_vcpu(d)) {
+ struct its_vlpi_map *map = get_vlpi_map(d);
+
va = page_address(map->vm->vprop_page);
hwirq = map->vintid;
Shouldn't we fix get_vlpi_map() instead? Something like (untested):
diff --git a/drivers/irqchip/irq-gic-v3-its.c
b/drivers/irqchip/irq-gic-v3-its.c
index e05673bcd52b..b704214390c0 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1170,13 +1170,14 @@ static void its_send_vclear(struct its_device
*dev, u32 event_id)
*/
static struct its_vlpi_map *get_vlpi_map(struct irq_data *d)
{
- struct its_device *its_dev = irq_data_get_irq_chip_data(d);
- u32 event = its_get_event_id(d);
+ 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);
- if (!irqd_is_forwarded_to_vcpu(d))
- return NULL;
+ return dev_event_to_vlpi_map(its_dev, event);
+ }
- return dev_event_to_vlpi_map(its_dev, event);
+ return NULL;
}
static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)
Or am I missing the actual problem?
Overall, I'm starting to hate that ->parent hack as it's been the source
of a number of bugs.
The main issue is that the VPE hierarchy is missing one level (it has
no ITS domain, and goes directly from the VPE domain to the low-level
GIC domain). It means we end-up special-casing things, and that's never
good...
M.
--
Jazz is not dead. It just smells funny...
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