openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

xen: use the trigger info we already have to choose the irq handler 

Do not use pirq_needs_eoi to decide which irq handler to use because Xen
always returns true if the guest does not support pirq_eoi_map.
Use the trigger information we already have from MP-tables and ACPI.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reported-by: Thomas Goetz <tom.goetz@virtualcomputer.com>
Tested-by: Thomas Goetz <tom.goetz@virtualcomputer.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2011-05-25 12:33:23 +01:00 committed by Konrad Rzeszutek Wilk
parent 55922c9d1b
commit e5ac0bda96
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/xen/events.c
View File

@ -626,6 +626,9 @@ int xen_allocate_pirq_gsi(unsigned gsi)
*
* Note: We don't assign an event channel until the irq actually started
* up. Return an existing irq if we've already got one for the gsi.
*
* Shareable implies level triggered, not shareable implies edge
* triggered here.
*/
int xen_bind_pirq_gsi_to_irq(unsigned gsi,
unsigned pirq, int shareable, char *name)
@ -664,16 +667,13 @@ int xen_bind_pirq_gsi_to_irq(unsigned gsi,
pirq_query_unmask(irq);
/* We try to use the handler with the appropriate semantic for the
* type of interrupt: if the interrupt doesn't need an eoi
* (pirq_needs_eoi returns false), we treat it like an edge
* triggered interrupt so we use handle_edge_irq.
* As a matter of fact this only happens when the corresponding
* physical interrupt is edge triggered or an msi.
* type of interrupt: if the interrupt is an edge triggered
* interrupt we use handle_edge_irq.
*
* On the other hand if the interrupt needs an eoi (pirq_needs_eoi
* returns true) we treat it like a level triggered interrupt so we
* use handle_fasteoi_irq like the native code does for this kind of
* On the other hand if the interrupt is level triggered we use
* handle_fasteoi_irq like the native code does for this kind of
* interrupts.
*
* Depending on the Xen version, pirq_needs_eoi might return true
* not only for level triggered interrupts but for edge triggered
* interrupts too. In any case Xen always honors the eoi mechanism,
@ -681,7 +681,7 @@ int xen_bind_pirq_gsi_to_irq(unsigned gsi,
* hasn't received an eoi yet. Therefore using the fasteoi handler
* is the right choice either way.
*/
if (pirq_needs_eoi(irq))
if (shareable)
irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
handle_fasteoi_irq, name);
else