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authorDavid Woodhouse <dwmw@amazon.co.uk>2023-01-18 12:22:38 +0000
committerJuergen Gross <jgross@suse.com>2023-02-13 06:53:20 +0100
commit3e8cd711c3da6c3d724076048038cd666bdbb2b5 (patch)
tree2385785636ed13b98e818f64874b996ecead55a8
parentcaea091e48ed9d3951506507abf26e9918d08e35 (diff)
xen: Allow platform PCI interrupt to be shared
When we don't use the per-CPU vector callback, we ask Xen to deliver event channel interrupts as INTx on the PCI platform device. As such, it can be shared with INTx on other PCI devices. Set IRQF_SHARED, and make it return IRQ_HANDLED or IRQ_NONE according to whether the evtchn_upcall_pending flag was actually set. Now I can share the interrupt: 11: 82 0 IO-APIC 11-fasteoi xen-platform-pci, ens4 Drop the IRQF_TRIGGER_RISING. It has no effect when the IRQ is shared, and besides, the only effect it was having even beforehand was to trigger a debug message in both I/OAPIC and legacy PIC cases: [ 0.915441] genirq: No set_type function for IRQ 11 (IO-APIC) [ 0.951939] genirq: No set_type function for IRQ 11 (XT-PIC) Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/f9a29a68d05668a3636dd09acd94d970269eaec6.camel@infradead.org Signed-off-by: Juergen Gross <jgross@suse.com>
-rw-r--r--drivers/xen/events/events_base.c9
-rw-r--r--drivers/xen/platform-pci.c5
-rw-r--r--include/xen/events.h2
3 files changed, 9 insertions, 7 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index c443f04aaad7..c7715f8bd452 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1710,9 +1710,10 @@ void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl)
generic_handle_irq(irq);
}
-static void __xen_evtchn_do_upcall(void)
+static int __xen_evtchn_do_upcall(void)
{
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
+ int ret = vcpu_info->evtchn_upcall_pending ? IRQ_HANDLED : IRQ_NONE;
int cpu = smp_processor_id();
struct evtchn_loop_ctrl ctrl = { 0 };
@@ -1737,6 +1738,8 @@ static void __xen_evtchn_do_upcall(void)
* above.
*/
__this_cpu_inc(irq_epoch);
+
+ return ret;
}
void xen_evtchn_do_upcall(struct pt_regs *regs)
@@ -1751,9 +1754,9 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
set_irq_regs(old_regs);
}
-void xen_hvm_evtchn_do_upcall(void)
+int xen_hvm_evtchn_do_upcall(void)
{
- __xen_evtchn_do_upcall();
+ return __xen_evtchn_do_upcall();
}
EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index cd07e3fed0fa..fcc819131572 100644
--- a/drivers/xen/platform-pci.c
+++ b/drivers/xen/platform-pci.c
@@ -64,14 +64,13 @@ static uint64_t get_callback_via(struct pci_dev *pdev)
static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
{
- xen_hvm_evtchn_do_upcall();
- return IRQ_HANDLED;
+ return xen_hvm_evtchn_do_upcall();
}
static int xen_allocate_irq(struct pci_dev *pdev)
{
return request_irq(pdev->irq, do_hvm_evtchn_intr,
- IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
+ IRQF_NOBALANCING | IRQF_SHARED,
"xen-platform-pci", pdev);
}
diff --git a/include/xen/events.h b/include/xen/events.h
index 344081e71584..44c2855c76d1 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -107,7 +107,7 @@ evtchn_port_t evtchn_from_irq(unsigned irq);
int xen_set_callback_via(uint64_t via);
void xen_evtchn_do_upcall(struct pt_regs *regs);
-void xen_hvm_evtchn_do_upcall(void);
+int xen_hvm_evtchn_do_upcall(void);
/* Bind a pirq for a physical interrupt to an irq. */
int xen_bind_pirq_gsi_to_irq(unsigned gsi,