linux_dsm_epyc7002/drivers/xen/events
Liu Shuo 020db9d3c1 xen/events: Fix interrupt lost during irq_disable and irq_enable
Here is a device has xen-pirq-MSI interrupt. Dom0 might lost interrupt
during driver irq_disable/irq_enable. Here is the scenario,
 1. irq_disable -> disable_dynirq -> mask_evtchn(irq channel)
 2. dev interrupt raised by HW and Xen mark its evtchn as pending
 3. irq_enable -> startup_pirq -> eoi_pirq ->
    clear_evtchn(channel of irq) -> clear pending status
 4. consume_one_event process the irq event without pending bit assert
    which result in interrupt lost once
 5. No HW interrupt raising anymore.

Now use enable_dynirq for enable_pirq of xen_pirq_chip to remove
eoi_pirq when irq_enable.

Signed-off-by: Liu Shuo <shuo.a.liu@intel.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
2017-08-11 16:46:01 +02:00
..
events_2l.c xen: features and fixes for 4.6-rc0 2016-03-22 12:55:17 -07:00
events_base.c xen/events: Fix interrupt lost during irq_disable and irq_enable 2017-08-11 16:46:01 +02:00
events_fifo.c xen: features and fixes for 4.10 rc2 2017-01-05 10:29:40 -08:00
events_internal.h Revert "xen/events/fifo: Handle linked events when closing a port" 2015-08-11 11:05:42 +01:00
Makefile xen/events: use the FIFO-based ABI if available 2014-01-06 10:07:57 -05:00