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Subject[PATCH 1/7] xen: support pirq != irq
Date
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

PHYSDEVOP_map_pirq might return a pirq different from what we asked if
we are running as an HVM guest, so we need to be able to support pirqs
that are different from linux irqs.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
drivers/xen/events.c | 49 +++++++++++++++++++++++++++++++++++++++++--------
include/xen/events.h | 1 +
2 files changed, 42 insertions(+), 8 deletions(-)
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 395fd19..a5c30db 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -90,6 +90,7 @@ struct irq_info
unsigned short virq;
enum ipi_vector ipi;
struct {
+ unsigned short pirq;
unsigned short gsi;
unsigned char vector;
unsigned char flags;
@@ -100,6 +101,7 @@ struct irq_info
#define PIRQ_SHAREABLE (1 << 1)

static struct irq_info *irq_info;
+static int *pirq_to_irq;

static int *evtchn_to_irq;
struct cpu_evtchn_s {
@@ -146,11 +148,12 @@ static struct irq_info mk_virq_info(unsigned short evtchn, unsigned short virq)
.cpu = 0, .u.virq = virq };
}

-static struct irq_info mk_pirq_info(unsigned short evtchn,
+static struct irq_info mk_pirq_info(unsigned short evtchn, unsigned short pirq,
unsigned short gsi, unsigned short vector)
{
return (struct irq_info) { .type = IRQT_PIRQ, .evtchn = evtchn,
- .cpu = 0, .u.pirq = { .gsi = gsi, .vector = vector } };
+ .cpu = 0,
+ .u.pirq = { .pirq = pirq, .gsi = gsi, .vector = vector } };
}

/*
@@ -192,6 +195,16 @@ static unsigned virq_from_irq(unsigned irq)
return info->u.virq;
}

+static unsigned pirq_from_irq(unsigned irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ BUG_ON(info == NULL);
+ BUG_ON(info->type != IRQT_PIRQ);
+
+ return info->u.pirq.pirq;
+}
+
static unsigned gsi_from_irq(unsigned irq)
{
struct irq_info *info = info_for_irq(irq);
@@ -364,6 +377,16 @@ static int get_nr_hw_irqs(void)
return ret;
}

+static int find_unbound_pirq(void)
+{
+ int i;
+ for (i = 0; i < nr_irqs; i++) {
+ if (pirq_to_irq[i] < 0)
+ return i;
+ }
+ return -1;
+}
+
static int find_unbound_irq(void)
{
int irq;
@@ -410,7 +433,7 @@ static bool identity_mapped_irq(unsigned irq)

static void pirq_unmask_notify(int irq)
{
- struct physdev_eoi eoi = { .irq = irq };
+ struct physdev_eoi eoi = { .irq = pirq_from_irq(irq) };

if (unlikely(pirq_needs_eoi(irq))) {
int rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
@@ -425,7 +448,7 @@ static void pirq_query_unmask(int irq)

BUG_ON(info->type != IRQT_PIRQ);

- irq_status.irq = irq;
+ irq_status.irq = pirq_from_irq(irq);
if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
irq_status.flags = 0;

@@ -453,7 +476,7 @@ static unsigned int startup_pirq(unsigned int irq)
if (VALID_EVTCHN(evtchn))
goto out;

- bind_pirq.pirq = irq;
+ bind_pirq.pirq = pirq_from_irq(irq);
/* NB. We are happy to share unless we are probing. */
bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ?
BIND_PIRQ__WILL_SHARE : 0;
@@ -556,12 +579,17 @@ static int find_irq_by_gsi(unsigned gsi)
return -1;
}

+int xen_allocate_pirq(unsigned gsi, int shareable, char *name)
+{
+ return xen_map_pirq_gsi(gsi, gsi, shareable, name);
+}
+
/*
* Allocate a physical irq, along with a vector. 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.
*/
-int xen_allocate_pirq(unsigned gsi, int shareable, char *name)
+int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
{
int irq;
struct physdev_irq irq_op;
@@ -570,7 +598,7 @@ int xen_allocate_pirq(unsigned gsi, int shareable, char *name)

irq = find_irq_by_gsi(gsi);
if (irq != -1) {
- printk(KERN_INFO "xen_allocate_pirq: returning irq %d for gsi %u\n",
+ printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n",
irq, gsi);
goto out; /* XXX need refcount? */
}
@@ -600,8 +628,9 @@ int xen_allocate_pirq(unsigned gsi, int shareable, char *name)
goto out;
}

- irq_info[irq] = mk_pirq_info(0, gsi, irq_op.vector);
+ irq_info[irq] = mk_pirq_info(0, pirq, gsi, irq_op.vector);
irq_info[irq].u.pirq.flags |= shareable ? PIRQ_SHAREABLE : 0;
+ pirq_to_irq[pirq] = irq;

out:
spin_unlock(&irq_mapping_update_lock);
@@ -1311,6 +1340,10 @@ void __init xen_init_IRQ(void)
GFP_KERNEL);
irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL);

+ pirq_to_irq = kcalloc(nr_irqs, sizeof(*pirq_to_irq), GFP_KERNEL);
+ for (i = 0; i < nr_irqs; i++)
+ pirq_to_irq[i] = -1;
+
evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
GFP_KERNEL);
for (i = 0; i < NR_EVENT_CHANNELS; i++)
diff --git a/include/xen/events.h b/include/xen/events.h
index 2f70de4..b276c38 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -71,6 +71,7 @@ void xen_hvm_evtchn_do_upcall(void);
GSIs are identity mapped; others are dynamically allocated as
usual. */
int xen_allocate_pirq(unsigned gsi, int shareable, char *name);
+int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name);

/* De-allocates the above mentioned physical interrupt. */
int xen_destroy_irq(int irq);
--
1.5.6.5


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